diff options
Diffstat (limited to 'liblogdiag/ld-diagram-view.c')
| -rw-r--r-- | liblogdiag/ld-diagram-view.c | 2346 |
1 files changed, 2346 insertions, 0 deletions
diff --git a/liblogdiag/ld-diagram-view.c b/liblogdiag/ld-diagram-view.c new file mode 100644 index 0000000..5991824 --- /dev/null +++ b/liblogdiag/ld-diagram-view.c @@ -0,0 +1,2346 @@ +/* + * ld-diagram-view.c + * + * This file is a part of logdiag. + * Copyright Přemysl Janouch 2010 - 2011. All rights reserved. + * + * See the file LICENSE for licensing information. + * + */ + +#include <math.h> +#include <string.h> +#include <gdk/gdkkeysyms.h> + +#include "liblogdiag.h" +#include "config.h" + + +/** + * SECTION:ld-diagram-view + * @short_description: A widget that displays an LdDiagram + * @see_also: #LdDiagram + * + * #LdDiagramView displays and enables the user to manipulate with + * an #LdDiagram. + */ + +/* Milimetres per inch. */ +#define MM_PER_INCH 25.4 +/* The default screen resolution in DPI units. */ +#define DEFAULT_SCREEN_RESOLUTION 96 + +/* The maximal, minimal and default values of zoom. */ +#define ZOOM_MIN 0.01 +#define ZOOM_MAX 100 +#define ZOOM_DEFAULT 1 +/* Multiplication factor for zooming. */ +#define ZOOM_STEP 1.4 + +/* When drawing is requested, extend all sides of + * the rectangle to be drawn by this number of pixels. + */ +#define QUEUE_DRAW_EXTEND 3 +/* Cursor tolerance for object borders. */ +#define OBJECT_BORDER_TOLERANCE 3 +/* Tolerance on all sides of symbols for strokes. */ +#define SYMBOL_CLIP_TOLERANCE 5 + +/* Size of a highlighted terminal. */ +#define TERMINAL_RADIUS 5 +/* Tolerance around terminal points. */ +#define TERMINAL_HOVER_TOLERANCE 8 + +/* + * OperationEnd: + * + * Called upon ending an operation. + */ +typedef void (*OperationEnd) (LdDiagramView *self); + +enum +{ + OPER_0, + OPER_ADD_OBJECT, + OPER_CONNECT, + OPER_SELECT, + OPER_MOVE_SELECTION +}; + +typedef struct _AddObjectData AddObjectData; +typedef struct _ConnectData ConnectData; +typedef struct _SelectData SelectData; +typedef struct _MoveSelectionData MoveSelectionData; + +struct _AddObjectData +{ + LdDiagramObject *object; + gboolean visible; +}; + +struct _ConnectData +{ + LdDiagramConnection *connection; + LdPoint origin; +}; + +struct _SelectData +{ + LdPoint drag_last_pos; +}; + +struct _MoveSelectionData +{ + LdPoint move_origin; +}; + +enum +{ + COLOR_BASE, + COLOR_GRID, + COLOR_OBJECT, + COLOR_SELECTION, + COLOR_TERMINAL, + COLOR_COUNT +}; + +typedef struct _Color Color; + +struct _Color +{ + gdouble r; + gdouble g; + gdouble b; + gdouble a; +}; + +/* + * LdDiagramViewPrivate: + * @diagram: a diagram object assigned as a model. + * @library: a library object assigned as a model. + * @adjustment_h: an adjustment object for the horizontal axis, if any. + * @adjustment_v: an adjustment object for the vertical axis, if any. + * @x: the X coordinate of the center of view. + * @y: the Y coordinate of the center of view. + * @zoom: the current zoom. + * @terminal: position of the highlighted terminal. + * @terminal_hovered: whether a terminal is hovered. + * @drag_start_pos: position of the mouse pointer when dragging started. + * @drag_operation: the operation to start when dragging starts. + * @operation: the current operation. + * @operation_data: data related to the current operation. + * @operation_end: a callback to end the operation. + * @palette: colors used by the widget. + */ +struct _LdDiagramViewPrivate +{ + LdDiagram *diagram; + LdLibrary *library; + + GtkAdjustment *adjustment_h; + GtkAdjustment *adjustment_v; + + gdouble x; + gdouble y; + gdouble zoom; + + LdPoint terminal; + gboolean terminal_hovered; + + LdPoint drag_start_pos; + gint drag_operation; + + gint operation; + union + { + AddObjectData add_object; + ConnectData connect; + SelectData select; + MoveSelectionData move_selection; + } + operation_data; + OperationEnd operation_end; + + Color palette[COLOR_COUNT]; +}; + +#define OPER_DATA(self, member) ((self)->priv->operation_data.member) +#define COLOR_GET(self, name) (&(self)->priv->palette[name]) + +/* + * DrawData: + * @self: our #LdDiagramView. + * @cr: a cairo context to draw on. + * @exposed_rect: the area that is to be redrawn. + * @scale: computed size of one diagram unit in pixels. + */ +typedef struct _DrawData DrawData; + +struct _DrawData +{ + LdDiagramView *self; + cairo_t *cr; + LdRectangle exposed_rect; + gdouble scale; +}; + +enum +{ + PROP_0, + PROP_DIAGRAM, + PROP_LIBRARY, + PROP_ZOOM +}; + +static void ld_diagram_view_get_property (GObject *object, guint property_id, + GValue *value, GParamSpec *pspec); +static void ld_diagram_view_set_property (GObject *object, guint property_id, + const GValue *value, GParamSpec *pspec); +static void ld_diagram_view_finalize (GObject *gobject); + +static void ld_diagram_view_real_set_scroll_adjustments + (LdDiagramView *self, GtkAdjustment *horizontal, GtkAdjustment *vertical); +static void on_adjustment_value_changed + (GtkAdjustment *adjustment, LdDiagramView *self); +static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation, + gpointer user_data); +static void update_adjustments (LdDiagramView *self); +static void ld_diagram_view_real_move (LdDiagramView *self, + gdouble dx, gdouble dy); + +static void diagram_connect_signals (LdDiagramView *self); +static void diagram_disconnect_signals (LdDiagramView *self); + +static gdouble ld_diagram_view_get_base_unit_in_px (GtkWidget *self); +static gdouble ld_diagram_view_get_scale_in_px (LdDiagramView *self); + +/* Helper functions. */ +static void color_set (Color *color, + gdouble r, gdouble g, gdouble b, gdouble a); +static void color_apply (Color *color, cairo_t *cr); +static guint32 color_to_cairo_argb (Color *color); + +static gdouble point_to_line_segment_distance + (const LdPoint *point, const LdPoint *p1, const LdPoint *p2); + +/* Generic functions. */ +static gboolean object_hit_test (LdDiagramView *self, + LdDiagramObject *object, const LdPoint *point); +static gboolean get_object_clip_area (LdDiagramView *self, + LdDiagramObject *object, LdRectangle *rect); + +static void move_object_to_point (LdDiagramView *self, LdDiagramObject *object, + const LdPoint *point); +static LdDiagramObject *get_object_at_point (LdDiagramView *self, + const LdPoint *point); + +static void move_selection (LdDiagramView *self, gdouble dx, gdouble dy); +static gboolean is_object_selected (LdDiagramView *self, + LdDiagramObject *object); + +static void queue_draw (LdDiagramView *self, LdRectangle *rect); +static void queue_object_draw (LdDiagramView *self, LdDiagramObject *object); + +/* Symbol terminals. */ +static void check_terminals (LdDiagramView *self, const LdPoint *point); +static void rotate_terminal (LdPoint *terminal, gint symbol_rotation); +static void hide_terminals (LdDiagramView *self); +static void queue_terminal_draw (LdDiagramView *self, LdPoint *terminal); + +/* Diagram symbol. */ +static gboolean symbol_hit_test (LdDiagramView *self, + LdDiagramSymbol *symbol, const LdPoint *point); +static gboolean get_symbol_clip_area (LdDiagramView *self, + LdDiagramSymbol *symbol, LdRectangle *rect); + +static gboolean get_symbol_area (LdDiagramView *self, + LdDiagramSymbol *symbol, LdRectangle *rect); +static void rotate_symbol_area (LdRectangle *area, gint rotation); +static void rotate_symbol (LdDiagramView *self, LdDiagramSymbol *symbol); +static LdSymbol *resolve_symbol (LdDiagramView *self, + LdDiagramSymbol *diagram_symbol); + +/* Diagram connection. */ +static gboolean connection_hit_test (LdDiagramView *self, + LdDiagramConnection *connection, const LdPoint *point); +static gboolean get_connection_clip_area (LdDiagramView *self, + LdDiagramConnection *connection, LdRectangle *rect); + +static gboolean get_connection_area (LdDiagramView *self, + LdDiagramConnection *connection, LdRectangle *rect); + +/* Operations. */ +static void ld_diagram_view_real_cancel_operation (LdDiagramView *self); +static void oper_add_object_end (LdDiagramView *self); + +static void oper_connect_begin (LdDiagramView *self, const LdPoint *point); +static void oper_connect_end (LdDiagramView *self); +static void oper_connect_motion (LdDiagramView *self, const LdPoint *point); + +static void oper_select_begin (LdDiagramView *self, const LdPoint *point); +static void oper_select_end (LdDiagramView *self); +static void oper_select_get_rectangle (LdDiagramView *self, LdRectangle *rect); +static void oper_select_queue_draw (LdDiagramView *self); +static void oper_select_draw (GtkWidget *widget, DrawData *data); +static void oper_select_motion (LdDiagramView *self, const LdPoint *point); + +static void oper_move_selection_begin (LdDiagramView *self, + const LdPoint *point); +static void oper_move_selection_end (LdDiagramView *self); +static void oper_move_selection_motion (LdDiagramView *self, + const LdPoint *point); + +/* Events, rendering. */ +static void simulate_motion (LdDiagramView *self); +static gboolean on_motion_notify (GtkWidget *widget, GdkEventMotion *event, + gpointer user_data); +static gboolean on_leave_notify (GtkWidget *widget, GdkEventCrossing *event, + gpointer user_data); +static gboolean on_button_press (GtkWidget *widget, GdkEventButton *event, + gpointer user_data); +static gboolean on_button_release (GtkWidget *widget, GdkEventButton *event, + gpointer user_data); +static gboolean on_scroll (GtkWidget *widget, GdkEventScroll *event, + gpointer user_data); + +static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event, + gpointer user_data); +static void draw_grid (GtkWidget *widget, DrawData *data); +static void draw_diagram (GtkWidget *widget, DrawData *data); +static void draw_terminal (GtkWidget *widget, DrawData *data); +static void draw_object (LdDiagramObject *diagram_object, DrawData *data); +static void draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data); +static void draw_connection (LdDiagramConnection *connection, DrawData *data); + + +G_DEFINE_TYPE (LdDiagramView, ld_diagram_view, GTK_TYPE_DRAWING_AREA); + +static void +ld_diagram_view_class_init (LdDiagramViewClass *klass) +{ + GObjectClass *object_class; + GtkWidgetClass *widget_class; + GtkBindingSet *binding_set; + GParamSpec *pspec; + + widget_class = GTK_WIDGET_CLASS (klass); + + object_class = G_OBJECT_CLASS (klass); + object_class->get_property = ld_diagram_view_get_property; + object_class->set_property = ld_diagram_view_set_property; + object_class->finalize = ld_diagram_view_finalize; + + klass->set_scroll_adjustments = ld_diagram_view_real_set_scroll_adjustments; + klass->cancel_operation = ld_diagram_view_real_cancel_operation; + klass->move = ld_diagram_view_real_move; + + binding_set = gtk_binding_set_by_class (klass); + gtk_binding_entry_add_signal (binding_set, GDK_Escape, 0, + "cancel-operation", 0); + gtk_binding_entry_add_signal (binding_set, GDK_Left, 0, + "move", 2, G_TYPE_DOUBLE, (gdouble) -1, G_TYPE_DOUBLE, (gdouble) 0); + gtk_binding_entry_add_signal (binding_set, GDK_Right, 0, + "move", 2, G_TYPE_DOUBLE, (gdouble) 1, G_TYPE_DOUBLE, (gdouble) 0); + gtk_binding_entry_add_signal (binding_set, GDK_Up, 0, + "move", 2, G_TYPE_DOUBLE, (gdouble) 0, G_TYPE_DOUBLE, (gdouble) -1); + gtk_binding_entry_add_signal (binding_set, GDK_Down, 0, + "move", 2, G_TYPE_DOUBLE, (gdouble) 0, G_TYPE_DOUBLE, (gdouble) 1); + +/** + * LdDiagramView:diagram: + * + * The underlying #LdDiagram object of this view. + */ + pspec = g_param_spec_object ("diagram", "Diagram", + "The underlying diagram object of this view.", + LD_TYPE_DIAGRAM, G_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_DIAGRAM, pspec); + +/** + * LdDiagramView:library: + * + * The #LdLibrary from which symbols are retrieved. + */ + pspec = g_param_spec_object ("library", "Library", + "The library from which symbols are retrieved.", + LD_TYPE_LIBRARY, G_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_LIBRARY, pspec); + +/** + * LdDiagramView:zoom: + * + * The zoom of this view. + */ + pspec = g_param_spec_double ("zoom", "Zoom", + "The zoom of this view.", + ZOOM_MIN, ZOOM_MAX, ZOOM_DEFAULT, G_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_ZOOM, pspec); + +/** + * LdDiagramView::set-scroll-adjustments: + * @self: an #LdDiagramView object. + * @horizontal: the horizontal #GtkAdjustment. + * @vertical: the vertical #GtkAdjustment. + * + * Set scroll adjustments for the widget. + */ + widget_class->set_scroll_adjustments_signal = g_signal_new + ("set-scroll-adjustments", G_TYPE_FROM_CLASS (widget_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (LdDiagramViewClass, set_scroll_adjustments), + NULL, NULL, + ld_marshal_VOID__OBJECT_OBJECT, + G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT); + +/** + * LdDiagramView::cancel-operation: + * @self: an #LdDiagramView object. + * + * Cancel any current operation. + */ + klass->cancel_operation_signal = g_signal_new + ("cancel-operation", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (LdDiagramViewClass, cancel_operation), NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); + +/** + * LdDiagramView::move: + * @self: an #LdDiagramView object. + * @dx: The difference by which to move on the horizontal axis. + * @dy: The difference by which to move on the vertical axis. + * + * Move the selection, if any, or the document. + */ + klass->move_signal = g_signal_new + ("move", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (LdDiagramViewClass, move), NULL, NULL, + ld_marshal_VOID__DOUBLE_DOUBLE, + G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE); + + g_type_class_add_private (klass, sizeof (LdDiagramViewPrivate)); +} + +static void +ld_diagram_view_init (LdDiagramView *self) +{ + self->priv = G_TYPE_INSTANCE_GET_PRIVATE + (self, LD_TYPE_DIAGRAM_VIEW, LdDiagramViewPrivate); + + self->priv->x = 0; + self->priv->y = 0; + self->priv->zoom = ZOOM_DEFAULT; + + color_set (COLOR_GET (self, COLOR_BASE), 1, 1, 1, 1); + color_set (COLOR_GET (self, COLOR_GRID), 0.5, 0.5, 0.5, 1); + color_set (COLOR_GET (self, COLOR_OBJECT), 0, 0, 0, 1); + color_set (COLOR_GET (self, COLOR_SELECTION), 1, 0, 0, 1); + color_set (COLOR_GET (self, COLOR_TERMINAL), 1, 0.5, 0.5, 1); + + g_signal_connect (self, "size-allocate", + G_CALLBACK (on_size_allocate), NULL); + g_signal_connect (self, "expose-event", + G_CALLBACK (on_expose_event), NULL); + + g_signal_connect (self, "motion-notify-event", + G_CALLBACK (on_motion_notify), NULL); + g_signal_connect (self, "leave-notify-event", + G_CALLBACK (on_leave_notify), NULL); + g_signal_connect (self, "button-press-event", + G_CALLBACK (on_button_press), NULL); + g_signal_connect (self, "button-release-event", + G_CALLBACK (on_button_release), NULL); + g_signal_connect (self, "scroll-event", + G_CALLBACK (on_scroll), NULL); + + g_object_set (self, "can-focus", TRUE, NULL); + + gtk_widget_add_events (GTK_WIDGET (self), + GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK + | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK + | GDK_LEAVE_NOTIFY_MASK); +} + +static void +ld_diagram_view_finalize (GObject *gobject) +{ + LdDiagramView *self; + + self = LD_DIAGRAM_VIEW (gobject); + + ld_diagram_view_real_set_scroll_adjustments (self, NULL, NULL); + + if (self->priv->diagram) + { + diagram_disconnect_signals (self); + g_object_unref (self->priv->diagram); + } + if (self->priv->library) + g_object_unref (self->priv->library); + + /* Chain up to the parent class. */ + G_OBJECT_CLASS (ld_diagram_view_parent_class)->finalize (gobject); +} + +static void +ld_diagram_view_get_property (GObject *object, guint property_id, + GValue *value, GParamSpec *pspec) +{ + LdDiagramView *self; + + self = LD_DIAGRAM_VIEW (object); + switch (property_id) + { + case PROP_DIAGRAM: + g_value_set_object (value, ld_diagram_view_get_diagram (self)); + break; + case PROP_LIBRARY: + g_value_set_object (value, ld_diagram_view_get_library (self)); + break; + case PROP_ZOOM: + g_value_set_double (value, ld_diagram_view_get_zoom (self)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + } +} + +static void +ld_diagram_view_set_property (GObject *object, guint property_id, + const GValue *value, GParamSpec *pspec) +{ + LdDiagramView *self; + + self = LD_DIAGRAM_VIEW (object); + switch (property_id) + { + case PROP_DIAGRAM: + ld_diagram_view_set_diagram (self, + LD_DIAGRAM (g_value_get_object (value))); + break; + case PROP_LIBRARY: + ld_diagram_view_set_library (self, + LD_LIBRARY (g_value_get_object (value))); + break; + case PROP_ZOOM: + ld_diagram_view_set_zoom (self, g_value_get_double (value)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + } +} + +static void +ld_diagram_view_real_set_scroll_adjustments (LdDiagramView *self, + GtkAdjustment *horizontal, GtkAdjustment *vertical) +{ + /* TODO: Infinite area. */ + GtkWidget *widget; + gdouble scale; + + widget = GTK_WIDGET (self); + scale = ld_diagram_view_get_scale_in_px (self); + + if (horizontal != self->priv->adjustment_h) + { + if (self->priv->adjustment_h) + { + g_signal_handlers_disconnect_by_func (self->priv->adjustment_h, + on_adjustment_value_changed, self); + g_object_unref (self->priv->adjustment_h); + + self->priv->adjustment_h = NULL; + } + if (horizontal) + { + g_object_ref (horizontal); + g_signal_connect (horizontal, "value-changed", + G_CALLBACK (on_adjustment_value_changed), self); + + horizontal->upper = 100; + horizontal->lower = -100; + horizontal->step_increment = 0.5; + horizontal->page_increment = 5; + horizontal->page_size = widget->allocation.width / scale; + horizontal->value = -horizontal->page_size / 2; + + self->priv->adjustment_h = horizontal; + } + } + + if (vertical != self->priv->adjustment_v) + { + if (self->priv->adjustment_v) + { + g_signal_handlers_disconnect_by_func (self->priv->adjustment_v, + on_adjustment_value_changed, self); + g_object_unref (self->priv->adjustment_v); + + self->priv->adjustment_v = NULL; + } + if (vertical) + { + g_object_ref (vertical); + g_signal_connect (vertical, "value-changed", + G_CALLBACK (on_adjustment_value_changed), self); + + vertical->upper = 100; + vertical->lower = -100; + vertical->step_increment = 0.5; + vertical->page_increment = 5; + vertical->page_size = widget->allocation.height / scale; + vertical->value = -vertical->page_size / 2; + + self->priv->adjustment_v = vertical; + } + } +} + +static void +on_adjustment_value_changed (GtkAdjustment *adjustment, LdDiagramView *self) +{ + GtkWidget *widget; + gdouble scale; + + widget = GTK_WIDGET (self); + scale = ld_diagram_view_get_scale_in_px (self); + + if (adjustment == self->priv->adjustment_h) + { + self->priv->x = adjustment->value + + widget->allocation.width / scale / 2; + gtk_widget_queue_draw (widget); + } + else if (adjustment == self->priv->adjustment_v) + { + self->priv->y = adjustment->value + + widget->allocation.height / scale / 2; + gtk_widget_queue_draw (widget); + } +} + +static void +on_size_allocate (GtkWidget *widget, GtkAllocation *allocation, + gpointer user_data) +{ + LdDiagramView *self; + + self = LD_DIAGRAM_VIEW (widget); + + /* FIXME: If the new allocation is bigger, we may see more than + * what we're supposed to be able to see -> adjust X and Y. + * + * If the visible area is so large that we simply must see more, + * let's disable the scrollbars in question. + */ + update_adjustments (self); +} + +static void +update_adjustments (LdDiagramView *self) +{ + gdouble scale; + + scale = ld_diagram_view_get_scale_in_px (self); + + if (self->priv->adjustment_h) + { + self->priv->adjustment_h->page_size + = GTK_WIDGET (self)->allocation.width / scale; + self->priv->adjustment_h->value + = self->priv->x - self->priv->adjustment_h->page_size / 2; + gtk_adjustment_changed (self->priv->adjustment_h); + } + if (self->priv->adjustment_v) + { + self->priv->adjustment_v->page_size + = GTK_WIDGET (self)->allocation.height / scale; + self->priv->adjustment_v->value + = self->priv->y - self->priv->adjustment_v->page_size / 2; + gtk_adjustment_changed (self->priv->adjustment_v); + } +} + +static void +ld_diagram_view_real_move (LdDiagramView *self, gdouble dx, gdouble dy) +{ + LdDiagram *diagram; + + diagram = self->priv->diagram; + if (!diagram) + return; + + /* TODO: Check/move boundaries, also implement normal + * getters and setters for priv->x and priv->y. + */ + if (ld_diagram_get_selection (diagram)) + move_selection (self, dx, dy); + else + { + self->priv->x += dx; + self->priv->y += dy; + + simulate_motion (self); + update_adjustments (self); + } + gtk_widget_queue_draw (GTK_WIDGET (self)); +} + + +/* ===== Generic interface etc. ============================================ */ + +/** + * ld_diagram_view_new: + * + * Create an instance. + */ +GtkWidget * +ld_diagram_view_new (void) +{ + return g_object_new (LD_TYPE_DIAGRAM_VIEW, NULL); +} + +/** + * ld_diagram_view_set_diagram: + * @self: an #LdDiagramView object. + * @diagram: the #LdDiagram to be assigned to the view. + * + * Assign an #LdDiagram object to the view. + */ +void +ld_diagram_view_set_diagram (LdDiagramView *self, LdDiagram *diagram) +{ + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + g_return_if_fail (LD_IS_DIAGRAM (diagram)); + + if (self->priv->diagram) + { + diagram_disconnect_signals (self); + g_object_unref (self->priv->diagram); + } + + self->priv->diagram = diagram; + diagram_connect_signals (self); + g_object_ref (diagram); + + g_object_notify (G_OBJECT (self), "diagram"); +} + +/** + * ld_diagram_view_get_diagram: + * @self: an #LdDiagramView object. + * + * Get the #LdDiagram object assigned to this view. + * The reference count on the diagram is not incremented. + */ +LdDiagram * +ld_diagram_view_get_diagram (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), NULL); + return self->priv->diagram; +} + +static void +diagram_connect_signals (LdDiagramView *self) +{ + g_return_if_fail (LD_IS_DIAGRAM (self->priv->diagram)); + + g_signal_connect_swapped (self->priv->diagram, "changed", + G_CALLBACK (gtk_widget_queue_draw), self); + g_signal_connect_swapped (self->priv->diagram, "selection-changed", + G_CALLBACK (gtk_widget_queue_draw), self); +} + +static void +diagram_disconnect_signals (LdDiagramView *self) +{ + g_return_if_fail (LD_IS_DIAGRAM (self->priv->diagram)); + + g_signal_handlers_disconnect_matched (self->priv->diagram, + G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA, 0, 0, NULL, + gtk_widget_queue_draw, self); +} + +/** + * ld_diagram_view_set_library: + * @self: an #LdDiagramView object. + * @library: the #LdLibrary to be assigned to the view. + * + * Assign an #LdLibrary object to the view. + */ +void +ld_diagram_view_set_library (LdDiagramView *self, LdLibrary *library) +{ + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + g_return_if_fail (LD_IS_LIBRARY (library)); + + if (self->priv->library) + g_object_unref (self->priv->library); + + self->priv->library = library; + g_object_ref (library); + + g_object_notify (G_OBJECT (self), "library"); +} + +/** + * ld_diagram_view_get_library: + * @self: an #LdDiagramView object. + * + * Get the #LdLibrary object assigned to this view. + * The reference count on the library is not incremented. + */ +LdLibrary * +ld_diagram_view_get_library (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), NULL); + return self->priv->library; +} + +/* + * ld_diagram_view_get_base_unit_in_px: + * @self: a #GtkWidget object to retrieve DPI from (indirectly). + * + * Return value: length of the base unit in pixels. + */ +static gdouble +ld_diagram_view_get_base_unit_in_px (GtkWidget *self) +{ + gdouble resolution; + + g_return_val_if_fail (GTK_IS_WIDGET (self), 1); + + resolution = gdk_screen_get_resolution (gtk_widget_get_screen (self)); + if (resolution == -1) + resolution = DEFAULT_SCREEN_RESOLUTION; + + /* XXX: It might look better if the unit was rounded to a whole number. */ + return resolution / MM_PER_INCH * LD_DIAGRAM_VIEW_BASE_UNIT_LENGTH; +} + +/* + * ld_diagram_view_get_scale_in_px: + * @self: an #LdDiagramView object. + * + * Return value: displayed length of the base unit in pixels. + */ +static gdouble +ld_diagram_view_get_scale_in_px (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), 1); + + return ld_diagram_view_get_base_unit_in_px (GTK_WIDGET (self)) + * self->priv->zoom; +} + +/** + * ld_diagram_view_widget_to_diagram_coords: + * @self: an #LdDiagramView object. + * @wx: the X coordinate to be translated. + * @wy: the Y coordinate to be translated. + * @dx: (out): the translated X coordinate. + * @dy: (out): the translated Y coordinate. + * + * Translate widget coordinates into diagram coordinates. + */ +void +ld_diagram_view_widget_to_diagram_coords (LdDiagramView *self, + gdouble wx, gdouble wy, gdouble *dx, gdouble *dy) +{ + GtkWidget *widget; + gdouble scale; + + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + g_return_if_fail (dx != NULL); + g_return_if_fail (dy != NULL); + + widget = GTK_WIDGET (self); + scale = ld_diagram_view_get_scale_in_px (self); + + /* We know diagram coordinates of the center of view, so we may + * translate the given X and Y coordinates to this center and then scale + * them by dividing them by the current scale. + */ + *dx = self->priv->x + (wx - (widget->allocation.width * 0.5)) / scale; + *dy = self->priv->y + (wy - (widget->allocation.height * 0.5)) / scale; +} + +/** + * ld_diagram_view_diagram_to_widget_coords: + * @self: an #LdDiagramView object. + * @dx: the X coordinate to be translated. + * @dy: the Y coordinate to be translated. + * @wx: (out): the translated X coordinate. + * @wy: (out): the translated Y coordinate. + * + * Translate diagram coordinates into widget coordinates. + */ +void +ld_diagram_view_diagram_to_widget_coords (LdDiagramView *self, + gdouble dx, gdouble dy, gdouble *wx, gdouble *wy) +{ + GtkWidget *widget; + gdouble scale; + + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + g_return_if_fail (wx != NULL); + g_return_if_fail (wy != NULL); + + widget = GTK_WIDGET (self); + scale = ld_diagram_view_get_scale_in_px (self); + + /* Just the reversal of ld_diagram_view_widget_to_diagram_coords(). */ + *wx = scale * (dx - self->priv->x) + 0.5 * widget->allocation.width; + *wy = scale * (dy - self->priv->y) + 0.5 * widget->allocation.height; +} + +/** + * ld_diagram_view_get_zoom: + * @self: an #LdDiagramView object. + * + * Return value: zoom of the view. + */ +gdouble +ld_diagram_view_get_zoom (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), -1); + return self->priv->zoom; +} + +/** + * ld_diagram_view_set_zoom: + * @self: an #LdDiagramView object. + * @zoom: the zoom. + * + * Set zoom of the view. + */ +void +ld_diagram_view_set_zoom (LdDiagramView *self, gdouble zoom) +{ + gdouble clamped_zoom; + + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + + clamped_zoom = CLAMP (zoom, ZOOM_MIN, ZOOM_MAX); + if (self->priv->zoom == clamped_zoom) + return; + + self->priv->zoom = clamped_zoom; + + simulate_motion (self); + update_adjustments (self); + gtk_widget_queue_draw (GTK_WIDGET (self)); + + g_object_notify (G_OBJECT (self), "zoom"); +} + +/** + * ld_diagram_view_can_zoom_in: + * @self: an #LdDiagramView object. + * + * Return value: %TRUE if the view can be zoomed in. + */ +gboolean +ld_diagram_view_can_zoom_in (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), FALSE); + return self->priv->zoom < ZOOM_MAX; +} + +/** + * ld_diagram_view_can_zoom_out: + * @self: an #LdDiagramView object. + * + * Return value: %TRUE if the view can be zoomed out. + */ +gboolean +ld_diagram_view_can_zoom_out (LdDiagramView *self) +{ + g_return_val_if_fail (LD_IS_DIAGRAM_VIEW (self), FALSE); + return self->priv->zoom > ZOOM_MIN; +} + +/** + * ld_diagram_view_zoom_in: + * @self: an #LdDiagramView object. + * + * Zoom the view in. + */ +void +ld_diagram_view_zoom_in (LdDiagramView *self) +{ + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + ld_diagram_view_set_zoom (self, self->priv->zoom * ZOOM_STEP); +} + +/** + * ld_diagram_view_zoom_out: + * @self: an #LdDiagramView object. + * + * Zoom the view out. + */ +void +ld_diagram_view_zoom_out (LdDiagramView *self) +{ + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + ld_diagram_view_set_zoom (self, self->priv->zoom / ZOOM_STEP); +} + + +/* ===== Helper functions ================================================== */ + +static void +color_set (Color *color, gdouble r, gdouble g, gdouble b, gdouble a) +{ + color->r = r; + color->g = g; + color->b = b; + color->a = a; +} + +static void +color_apply (Color *color, cairo_t *cr) +{ + cairo_set_source_rgba (cr, color->r, color->g, color->b, color->a); +} + +static guint32 +color_to_cairo_argb (Color *color) +{ + return (guint) (color->a * 255) << 24 + | (guint) (color->r * color->a * 255) << 16 + | (guint) (color->g * color->a * 255) << 8 + | (guint) (color->b * color->a * 255); +} + +static gdouble +point_to_line_segment_distance + (const LdPoint *point, const LdPoint *p1, const LdPoint *p2) +{ + gdouble dx, dy, u; + + dx = p2->x - p1->x; + dy = p2->y - p1->y; + + if (dx == 0. && dy == 0.) + return ld_point_distance (point, p1->x, p1->y); + + /* Find projection of the point onto the line. */ + u = ((point->x - p1->x) * dx + (point->y - p1->y) * dy) + / (dx * dx + dy * dy); + + /* The projection is beyond the line segment. */ + if (u < 0.) + return ld_point_distance (point, p1->x, p1->y); + else if (u > 1.) + return ld_point_distance (point, p2->x, p2->y); + + /* The projection is on the line segment. */ + return ld_point_distance (point, p1->x + u * dx, p1->y + u * dy); +} + + +/* ===== Generic functions ================================================= */ + +static gboolean +object_hit_test (LdDiagramView *self, LdDiagramObject *object, + const LdPoint *point) +{ + if (LD_IS_DIAGRAM_SYMBOL (object)) + return symbol_hit_test (self, + LD_DIAGRAM_SYMBOL (object), point); + if (LD_IS_DIAGRAM_CONNECTION (object)) + return connection_hit_test (self, + LD_DIAGRAM_CONNECTION (object), point); + return FALSE; +} + +static gboolean +get_object_clip_area (LdDiagramView *self, + LdDiagramObject *object, LdRectangle *rect) +{ + if (LD_IS_DIAGRAM_SYMBOL (object)) + return get_symbol_clip_area (self, + LD_DIAGRAM_SYMBOL (object), rect); + if (LD_IS_DIAGRAM_CONNECTION (object)) + return get_connection_clip_area (self, + LD_DIAGRAM_CONNECTION (object), rect); + return FALSE; +} + +static void +move_object_to_point (LdDiagramView *self, LdDiagramObject *object, + const LdPoint *point) +{ + gdouble diagram_x, diagram_y; + + ld_diagram_view_widget_to_diagram_coords (self, + point->x, point->y, &diagram_x, &diagram_y); + g_object_set (object, + "x", floor (diagram_x + 0.5), + "y", floor (diagram_y + 0.5), + NULL); +} + +static LdDiagramObject * +get_object_at_point (LdDiagramView *self, const LdPoint *point) +{ + GList *objects, *iter; + + /* Iterate from the top object downwards. */ + objects = (GList *) ld_diagram_get_objects (self->priv->diagram); + for (iter = g_list_last (objects); iter; iter = g_list_previous (iter)) + { + LdDiagramObject *object; + + object = LD_DIAGRAM_OBJECT (iter->data); + if (object_hit_test (self, object, point)) + return object; + } + return NULL; +} + +static void +move_selection (LdDiagramView *self, gdouble dx, gdouble dy) +{ + LdDiagram *diagram; + GList *selection, *iter; + + diagram = self->priv->diagram; + if (!diagram) + return; + + selection = ld_diagram_get_selection (diagram); + if (!selection) + return; + + ld_diagram_begin_user_action (diagram); + for (iter = selection; iter; iter = g_list_next (iter)) + { + gdouble x, y; + + g_object_get (iter->data, "x", &x, "y", &y, NULL); + x += dx; + y += dy; + g_object_set (iter->data, "x", x, "y", y, NULL); + } + ld_diagram_end_user_action (diagram); +} + +static gboolean +is_object_selected (LdDiagramView *self, LdDiagramObject *object) +{ + return g_list_find (ld_diagram_get_selection (self->priv->diagram), + object) != NULL; +} + +static void +queue_draw (LdDiagramView *self, LdRectangle *rect) +{ + LdRectangle area; + + area = *rect; + ld_rectangle_extend (&area, QUEUE_DRAW_EXTEND); + gtk_widget_queue_draw_area (GTK_WIDGET (self), + area.x, area.y, area.width, area.height); +} + +static void +queue_object_draw (LdDiagramView *self, LdDiagramObject *object) +{ + LdRectangle rect; + + if (!get_object_clip_area (self, object, &rect)) + return; + queue_draw (self, &rect); +} + + +/* ===== Symbol terminals ================================================== */ + +static void +check_terminals (LdDiagramView *self, const LdPoint *point) +{ + GList *objects, *iter; + LdDiagramSymbol *closest_symbol = NULL; + gdouble closest_distance = TERMINAL_HOVER_TOLERANCE; + LdPoint closest_terminal; + + objects = (GList *) ld_diagram_get_objects (self->priv->diagram); + for (iter = objects; iter; iter = g_list_next (iter)) + { + gdouble object_x, object_y; + LdDiagramSymbol *diagram_symbol; + LdSymbol *symbol; + const LdPointArray *terminals; + guint i; + gint rotation; + + if (!LD_IS_DIAGRAM_SYMBOL (iter->data)) + continue; + + diagram_symbol = LD_DIAGRAM_SYMBOL (iter->data); + symbol = resolve_symbol (self, diagram_symbol); + if (!symbol) + continue; + + g_object_get (diagram_symbol, "x", &object_x, "y", &object_y, + "rotation", &rotation, NULL); + + terminals = ld_symbol_get_terminals (symbol); + for (i = 0; i < terminals->length; i++) + { + LdPoint cur_term, widget_coords; + gdouble distance; + + cur_term = terminals->points[i]; + rotate_terminal (&cur_term, rotation); + cur_term.x += object_x; + cur_term.y += object_y; + + ld_diagram_view_diagram_to_widget_coords (self, + cur_term.x, cur_term.y, &widget_coords.x, &widget_coords.y); + distance = ld_point_distance (&widget_coords, point->x, point->y); + if (distance <= closest_distance) + { + closest_symbol = diagram_symbol; + closest_distance = distance; + closest_terminal = cur_term; + } + } + } + + hide_terminals (self); + + if (closest_symbol) + { + self->priv->terminal_hovered = TRUE; + self->priv->terminal = closest_terminal; + queue_terminal_draw (self, &closest_terminal); + } +} + +static void +rotate_terminal (LdPoint *terminal, gint symbol_rotation) +{ + gdouble temp; + + switch (symbol_rotation) + { + case LD_DIAGRAM_SYMBOL_ROTATION_90: + temp = terminal->y; + terminal->y = terminal->x; + terminal->x = -temp; + break; + case LD_DIAGRAM_SYMBOL_ROTATION_180: + terminal->y = -terminal->y; + terminal->x = -terminal->x; + break; + case LD_DIAGRAM_SYMBOL_ROTATION_270: + temp = terminal->x; + terminal->x = terminal->y; + terminal->y = -temp; + break; + } +} + +static void +hide_terminals (LdDiagramView *self) +{ + if (self->priv->terminal_hovered) + { + self->priv->terminal_hovered = FALSE; + queue_terminal_draw (self, &self->priv->terminal); + } +} + +static void +queue_terminal_draw (LdDiagramView *self, LdPoint *terminal) +{ + LdRectangle rect; + LdPoint widget_coords; + + ld_diagram_view_diagram_to_widget_coords (self, + terminal->x, terminal->y, &widget_coords.x, &widget_coords.y); + + rect.x = widget_coords.x - TERMINAL_RADIUS; + rect.y = widget_coords.y - TERMINAL_RADIUS; + rect.width = 2 * TERMINAL_RADIUS; + rect.height = 2 * TERMINAL_RADIUS; + + queue_draw (self, &rect); +} + + +/* ===== Diagram symbol ==================================================== */ + +static gboolean +symbol_hit_test (LdDiagramView *self, LdDiagramSymbol *symbol, + const LdPoint *point) +{ + LdRectangle rect; + + if (!get_symbol_area (self, symbol, &rect)) + return FALSE; + ld_rectangle_extend (&rect, OBJECT_BORDER_TOLERANCE); + return ld_rectangle_contains_point (&rect, point); +} + +static gboolean +get_symbol_clip_area (LdDiagramView *self, + LdDiagramSymbol *symbol, LdRectangle *rect) +{ + LdRectangle object_rect; + + if (!get_symbol_area (self, symbol, &object_rect)) + return FALSE; + + *rect = object_rect; + ld_rectangle_extend (rect, SYMBOL_CLIP_TOLERANCE); + return TRUE; +} + +static gboolean +get_symbol_area (LdDiagramView *self, LdDiagramSymbol *symbol, + LdRectangle *rect) +{ + gdouble object_x, object_y; + LdSymbol *library_symbol; + LdRectangle area; + gdouble x1, x2; + gdouble y1, y2; + gint rotation; + + g_object_get (symbol, "x", &object_x, "y", &object_y, + "rotation", &rotation, NULL); + + library_symbol = resolve_symbol (self, symbol); + if (library_symbol) + ld_symbol_get_area (library_symbol, &area); + else + return FALSE; + + rotate_symbol_area (&area, rotation); + + ld_diagram_view_diagram_to_widget_coords (self, + object_x + area.x, + object_y + area.y, + &x1, &y1); + ld_diagram_view_diagram_to_widget_coords (self, + object_x + area.x + area.width, + object_y + area.y + area.height, + &x2, &y2); + + x1 = floor (x1); + y1 = floor (y1); + x2 = ceil (x2); + y2 = ceil (y2); + + rect->x = x1; + rect->y = y1; + rect->width = x2 - x1; + rect->height = y2 - y1; + return TRUE; +} + +static void +rotate_symbol_area (LdRectangle *area, gint rotation) +{ + gdouble temp; + + switch (rotation) + { + case LD_DIAGRAM_SYMBOL_ROTATION_90: + temp = area->y; + area->y = area->x; + area->x = -(temp + area->height); + break; + case LD_DIAGRAM_SYMBOL_ROTATION_180: + area->y = -(area->y + area->height); + area->x = -(area->x + area->width); + break; + case LD_DIAGRAM_SYMBOL_ROTATION_270: + temp = area->x; + area->x = area->y; + area->y = -(temp + area->width); + break; + } + + switch (rotation) + { + case LD_DIAGRAM_SYMBOL_ROTATION_90: + case LD_DIAGRAM_SYMBOL_ROTATION_270: + temp = area->width; + area->width = area->height; + area->height = temp; + break; + } +} + +static void +rotate_symbol (LdDiagramView *self, LdDiagramSymbol *symbol) +{ + gint rotation; + + g_object_get (symbol, "rotation", &rotation, NULL); + queue_object_draw (self, LD_DIAGRAM_OBJECT (symbol)); + + switch (rotation) + { + case LD_DIAGRAM_SYMBOL_ROTATION_0: + rotation = LD_DIAGRAM_SYMBOL_ROTATION_90; + break; + case LD_DIAGRAM_SYMBOL_ROTATION_90: + rotation = LD_DIAGRAM_SYMBOL_ROTATION_180; + break; + case LD_DIAGRAM_SYMBOL_ROTATION_180: + rotation = LD_DIAGRAM_SYMBOL_ROTATION_270; + break; + case LD_DIAGRAM_SYMBOL_ROTATION_270: + rotation = LD_DIAGRAM_SYMBOL_ROTATION_0; + break; + } + + g_object_set (symbol, "rotation", rotation, NULL); + queue_object_draw (self, LD_DIAGRAM_OBJECT (symbol)); +} + +static LdSymbol * +resolve_symbol (LdDiagramView *self, LdDiagramSymbol *diagram_symbol) +{ + LdSymbol *symbol; + gchar *klass; + + if (!self->priv->library) + return NULL; + + klass = ld_diagram_symbol_get_class (diagram_symbol); + symbol = ld_library_find_symbol (self->priv->library, klass); + g_free (klass); + return symbol; +} + + +/* ===== Diagram connection ================================================ */ + +static gboolean +connection_hit_test (LdDiagramView *self, LdDiagramConnection *connection, + const LdPoint *point) +{ + gdouble object_x, object_y, length; + LdPointArray *points; + guint i; + + g_object_get (connection, "x", &object_x, "y", &object_y, NULL); + + points = ld_diagram_connection_get_points (connection); + if (points->length < 2) + { + ld_point_array_free (points); + return FALSE; + } + + for (i = 0; i < points->length; i++) + { + ld_diagram_view_diagram_to_widget_coords (self, + points->points[i].x + object_x, + points->points[i].y + object_y, + &points->points[i].x, + &points->points[i].y); + + if (!i) + continue; + + length = point_to_line_segment_distance + (point, &points->points[i - 1], &points->points[i]); + if (length <= OBJECT_BORDER_TOLERANCE) + { + ld_point_array_free (points); + return TRUE; + } + } + ld_point_array_free (points); + return FALSE; +} + +static gboolean +get_connection_clip_area (LdDiagramView *self, + LdDiagramConnection *connection, LdRectangle *rect) +{ + return get_connection_area (self, connection, rect); +} + +static gboolean +get_connection_area (LdDiagramView *self, + LdDiagramConnection *connection, LdRectangle *rect) +{ + gdouble x_origin, y_origin; + gdouble x, y, x_min, x_max, y_min, y_max; + LdPointArray *points; + guint i; + + points = ld_diagram_connection_get_points (connection); + if (!points->length) + { + ld_point_array_free (points); + return FALSE; + } + + g_object_get (connection, "x", &x_origin, "y", &y_origin, NULL); + + ld_diagram_view_diagram_to_widget_coords (self, + x_origin + points->points[0].x, + y_origin + points->points[0].y, + &x, &y); + + x_max = x_min = x; + y_max = y_min = y; + + for (i = 1; i < points->length; i++) + { + ld_diagram_view_diagram_to_widget_coords (self, + x_origin + points->points[i].x, + y_origin + points->points[i].y, + &x, &y); + + if (x < x_min) + x_min = x; + else if (x > x_max) + x_max = x; + + if (y < y_min) + y_min = y; + else if (y > y_max) + y_max = y; + } + + rect->x = x_min; + rect->y = y_min; + rect->width = x_max - x_min; + rect->height = y_max - y_min; + + ld_point_array_free (points); + return TRUE; +} + + +/* ===== Operations ======================================================== */ + +static void +ld_diagram_view_real_cancel_operation (LdDiagramView *self) +{ + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + + if (self->priv->operation) + { + if (self->priv->operation_end) + self->priv->operation_end (self); + self->priv->operation = OPER_0; + self->priv->operation_end = NULL; + } +} + +/** + * ld_diagram_view_add_object_begin: + * @self: an #LdDiagramView object. + * @object: (transfer full): the object to be added to the diagram. + * + * Begin an operation for adding an object into the diagram. + */ +void +ld_diagram_view_add_object_begin (LdDiagramView *self, LdDiagramObject *object) +{ + AddObjectData *data; + + g_return_if_fail (LD_IS_DIAGRAM_VIEW (self)); + g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object)); + + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + + self->priv->operation = OPER_ADD_OBJECT; + self->priv->operation_end = oper_add_object_end; + + data = &OPER_DATA (self, add_object); + data->object = object; +} + +static void +oper_add_object_end (LdDiagramView *self) +{ + AddObjectData *data; + + data = &OPER_DATA (self, add_object); + if (data->object) + { + queue_object_draw (self, data->object); + g_object_unref (data->object); + data->object = NULL; + } +} + +static void +oper_connect_begin (LdDiagramView *self, const LdPoint *point) +{ + ConnectData *data; + + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + + self->priv->operation = OPER_CONNECT; + self->priv->operation_end = oper_connect_end; + + data = &OPER_DATA (self, connect); + data->connection = ld_diagram_connection_new (NULL); + + data->origin = self->priv->terminal; + g_object_set (data->connection, + "x", data->origin.x, + "y", data->origin.y, + NULL); + + self->priv->terminal_hovered = FALSE; + + oper_connect_motion (self, point); +} + +static void +oper_connect_end (LdDiagramView *self) +{ + ConnectData *data; + + data = &OPER_DATA (self, connect); + queue_object_draw (self, LD_DIAGRAM_OBJECT (data->connection)); + + ld_diagram_insert_object (self->priv->diagram, + LD_DIAGRAM_OBJECT (data->connection), -1); + + g_object_unref (data->connection); +} + +static void +oper_connect_motion (LdDiagramView *self, const LdPoint *point) +{ + ConnectData *data; + LdPointArray *points; + gdouble diagram_x, diagram_y; + + data = &OPER_DATA (self, connect); + + /* Find an orthogonal path between the points. */ + /* TODO: This alghorithm is pretty lame, needs to be improved. */ + points = ld_point_array_sized_new (4); + points->length = 4; + + points->points[0].x = 0; + points->points[0].y = 0; + + ld_diagram_view_widget_to_diagram_coords (self, + point->x, point->y, &diagram_x, &diagram_y); + points->points[3].x = floor (diagram_x - data->origin.x + 0.5); + points->points[3].y = floor (diagram_y - data->origin.y + 0.5); + + if (ABS (points->points[3].x) > ABS (points->points[3].y)) + { + points->points[1].x = points->points[3].x / 2; + points->points[1].y = 0; + points->points[2].x = points->points[3].x / 2; + points->points[2].y = points->points[3].y; + } + else + { + points->points[1].x = 0; + points->points[1].y = points->points[3].y / 2; + points->points[2].x = points->points[3].x; + points->points[2].y = points->points[3].y / 2; + } + + queue_object_draw (self, LD_DIAGRAM_OBJECT (data->connection)); + ld_diagram_connection_set_points (data->connection, points); + queue_object_draw (self, LD_DIAGRAM_OBJECT (data->connection)); + ld_point_array_free (points); + + check_terminals (self, point); + + if (self->priv->terminal.x == data->origin.x + && self->priv->terminal.y == data->origin.y) + self->priv->terminal_hovered = FALSE; +} + +static void +oper_select_begin (LdDiagramView *self, const LdPoint *point) +{ + SelectData *data; + + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + + self->priv->operation = OPER_SELECT; + self->priv->operation_end = oper_select_end; + + data = &OPER_DATA (self, select); + data->drag_last_pos.x = self->priv->drag_start_pos.x; + data->drag_last_pos.y = self->priv->drag_start_pos.y; + + oper_select_motion (self, point); +} + +static void +oper_select_end (LdDiagramView *self) +{ + oper_select_queue_draw (self); +} + +static void +oper_select_get_rectangle (LdDiagramView *self, LdRectangle *rect) +{ + SelectData *data; + + data = &OPER_DATA (self, select); + rect->x = MIN (self->priv->drag_start_pos.x, data->drag_last_pos.x); + rect->y = MIN (self->priv->drag_start_pos.y, data->drag_last_pos.y); + rect->width = ABS (self->priv->drag_start_pos.x - data->drag_last_pos.x); + rect->height = ABS (self->priv->drag_start_pos.y - data->drag_last_pos.y); +} + +static void +oper_select_queue_draw (LdDiagramView *self) +{ + LdRectangle rect; + SelectData *data; + + data = &OPER_DATA (self, select); + oper_select_get_rectangle (self, &rect); + queue_draw (self, &rect); +} + +static void +oper_select_draw (GtkWidget *widget, DrawData *data) +{ + static const double dashes[] = {3, 5}; + SelectData *select_data; + + g_return_if_fail (data->self->priv->operation == OPER_SELECT); + + color_apply (COLOR_GET (data->self, COLOR_GRID), data->cr); + cairo_set_line_width (data->cr, 1); + cairo_set_line_cap (data->cr, CAIRO_LINE_CAP_SQUARE); + cairo_set_dash (data->cr, dashes, G_N_ELEMENTS (dashes), 0); + + select_data = &OPER_DATA (data->self, select); + + cairo_rectangle (data->cr, + data->self->priv->drag_start_pos.x - 0.5, + data->self->priv->drag_start_pos.y - 0.5, + select_data->drag_last_pos.x - data->self->priv->drag_start_pos.x + 1, + select_data->drag_last_pos.y - data->self->priv->drag_start_pos.y + 1); + cairo_stroke (data->cr); +} + +static void +oper_select_motion (LdDiagramView *self, const LdPoint *point) +{ + SelectData *data; + GList *objects, *iter; + LdRectangle selection_rect, rect; + + data = &OPER_DATA (self, select); + + oper_select_queue_draw (self); + data->drag_last_pos = *point; + oper_select_queue_draw (self); + + oper_select_get_rectangle (self, &selection_rect); + objects = (GList *) ld_diagram_get_objects (self->priv->diagram); + + for (iter = objects; iter; iter = g_list_next (iter)) + { + LdDiagramObject *object; + + object = LD_DIAGRAM_OBJECT (iter->data); + if (LD_IS_DIAGRAM_SYMBOL (object)) + { + if (!get_symbol_area (self, + LD_DIAGRAM_SYMBOL (object), &rect)) + continue; + } + else if (LD_IS_DIAGRAM_CONNECTION (object)) + { + if (!get_connection_area (self, + LD_DIAGRAM_CONNECTION (object), &rect)) + continue; + } + + ld_rectangle_extend (&rect, OBJECT_BORDER_TOLERANCE); + if (ld_rectangle_contains (&selection_rect, &rect)) + ld_diagram_select (self->priv->diagram, object); + else + ld_diagram_unselect (self->priv->diagram, object); + } +} + +static void +oper_move_selection_begin (LdDiagramView *self, const LdPoint *point) +{ + MoveSelectionData *data; + + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + + self->priv->operation = OPER_MOVE_SELECTION; + self->priv->operation_end = oper_move_selection_end; + + ld_diagram_begin_user_action (self->priv->diagram); + + data = &OPER_DATA (self, move_selection); + data->move_origin = self->priv->drag_start_pos; + + oper_move_selection_motion (self, point); +} + +static void +oper_move_selection_end (LdDiagramView *self) +{ + ld_diagram_end_user_action (self->priv->diagram); +} + +static void +oper_move_selection_motion (LdDiagramView *self, const LdPoint *point) +{ + MoveSelectionData *data; + gdouble scale, dx, dy, move_x, move_y; + gdouble move = FALSE; + + scale = ld_diagram_view_get_scale_in_px (self); + data = &OPER_DATA (self, move_selection); + + dx = point->x - data->move_origin.x; + dy = point->y - data->move_origin.y; + + move_x = dx < 0 ? ceil (dx / scale) : floor (dx / scale); + move_y = dy < 0 ? ceil (dy / scale) : floor (dy / scale); + + if (ABS (move_x) >= 1) + { + data->move_origin.x += move_x * scale; + move = TRUE; + } + if (ABS (move_y) >= 1) + { + data->move_origin.y += move_y * scale; + move = TRUE; + } + + if (move) + move_selection (self, move_x, move_y); +} + + +/* ===== Events, rendering ================================================= */ + +static void +simulate_motion (LdDiagramView *self) +{ + GdkEventMotion event; + GtkWidget *widget; + gint x, y; + GdkModifierType state; + + widget = GTK_WIDGET (self); + + if (gdk_window_get_pointer (widget->window, &x, &y, &state) + != widget->window) + return; + + memset (&event, 0, sizeof (event)); + event.type = GDK_MOTION_NOTIFY; + event.window = widget->window; + event.x = x; + event.y = y; + event.state = state; + + on_motion_notify (widget, &event, NULL); +} + +static gboolean +on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data) +{ + LdPoint point; + LdDiagramView *self; + AddObjectData *add_data; + + point.x = event->x; + point.y = event->y; + + self = LD_DIAGRAM_VIEW (widget); + switch (self->priv->operation) + { + case OPER_ADD_OBJECT: + add_data = &OPER_DATA (self, add_object); + add_data->visible = TRUE; + + queue_object_draw (self, add_data->object); + move_object_to_point (self, add_data->object, &point); + queue_object_draw (self, add_data->object); + break; + case OPER_CONNECT: + oper_connect_motion (self, &point); + break; + case OPER_SELECT: + oper_select_motion (self, &point); + break; + case OPER_MOVE_SELECTION: + oper_move_selection_motion (self, &point); + break; + case OPER_0: + if (event->state & GDK_BUTTON1_MASK + && (event->x != self->priv->drag_start_pos.x + || event->y != self->priv->drag_start_pos.y)) + { + switch (self->priv->drag_operation) + { + case OPER_CONNECT: + oper_connect_begin (self, &point); + break; + case OPER_SELECT: + oper_select_begin (self, &point); + break; + case OPER_MOVE_SELECTION: + oper_move_selection_begin (self, &point); + break; + } + } + check_terminals (self, &point); + break; + } + return FALSE; +} + +static gboolean +on_leave_notify (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data) +{ + LdDiagramView *self; + + self = LD_DIAGRAM_VIEW (widget); + switch (self->priv->operation) + { + AddObjectData *data; + + case OPER_ADD_OBJECT: + data = &OPER_DATA (self, add_object); + data->visible = FALSE; + + queue_object_draw (self, data->object); + break; + } + return FALSE; +} + +static gboolean +on_button_press (GtkWidget *widget, GdkEventButton *event, gpointer user_data) +{ + LdPoint point; + LdDiagramView *self; + AddObjectData *data; + LdDiagramObject *object; + + point.x = event->x; + point.y = event->y; + + self = LD_DIAGRAM_VIEW (widget); + if (!self->priv->diagram) + return FALSE; + + if (event->button == 3 && self->priv->operation == OPER_0) + { + object = get_object_at_point (self, &point); + if (object && LD_IS_DIAGRAM_SYMBOL (object)) + rotate_symbol (self, LD_DIAGRAM_SYMBOL (object)); + return FALSE; + } + + if (event->button != 1) + return FALSE; + if (!gtk_widget_has_focus (widget)) + gtk_widget_grab_focus (widget); + + self->priv->drag_operation = OPER_0; + switch (self->priv->operation) + { + case OPER_ADD_OBJECT: + data = &OPER_DATA (self, add_object); + + queue_object_draw (self, data->object); + move_object_to_point (self, data->object, &point); + ld_diagram_insert_object (self->priv->diagram, data->object, -1); + + /* XXX: "cancel" causes confusion. */ + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + break; + case OPER_0: + self->priv->drag_start_pos = point; + + if (self->priv->terminal_hovered) + { + self->priv->drag_operation = OPER_CONNECT; + break; + } + + object = get_object_at_point (self, &point); + if (!object) + { + ld_diagram_unselect_all (self->priv->diagram); + self->priv->drag_operation = OPER_SELECT; + } + else if (!is_object_selected (self, object)) + { + if (event->state != GDK_SHIFT_MASK) + ld_diagram_unselect_all (self->priv->diagram); + ld_diagram_select (self->priv->diagram, object); + self->priv->drag_operation = OPER_MOVE_SELECTION; + } + else + self->priv->drag_operation = OPER_MOVE_SELECTION; + break; + } + return FALSE; +} + +static gboolean +on_button_release (GtkWidget *widget, GdkEventButton *event, gpointer user_data) +{ + LdPoint point; + LdDiagramView *self; + LdDiagramObject *object; + + if (event->button != 1) + return FALSE; + + point.x = event->x; + point.y = event->y; + + self = LD_DIAGRAM_VIEW (widget); + if (!self->priv->diagram) + return FALSE; + + switch (self->priv->operation) + { + case OPER_SELECT: + case OPER_MOVE_SELECTION: + case OPER_CONNECT: + g_signal_emit (self, + LD_DIAGRAM_VIEW_GET_CLASS (self)->cancel_operation_signal, 0); + break; + case OPER_0: + object = get_object_at_point (self, &point); + if (object && is_object_selected (self, object)) + { + if (!(event->state & GDK_SHIFT_MASK)) + ld_diagram_unselect_all (self->priv->diagram); + ld_diagram_select (self->priv->diagram, object); + } + break; + } + return FALSE; +} + +static gboolean +on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data) +{ + gdouble prev_x, prev_y; + gdouble new_x, new_y; + LdPoint point; + LdDiagramView *self; + + point.x = event->x; + point.y = event->y; + self = LD_DIAGRAM_VIEW (widget); + + ld_diagram_view_widget_to_diagram_coords (self, + event->x, event->y, &prev_x, &prev_y); + + switch (event->direction) + { + case GDK_SCROLL_UP: + ld_diagram_view_zoom_in (self); + break; + case GDK_SCROLL_DOWN: + ld_diagram_view_zoom_out (self); + break; + default: + return FALSE; + } + + ld_diagram_view_widget_to_diagram_coords (self, + event->x, event->y, &new_x, &new_y); + + /* Focus on the point under the cursor. */ + self->priv->x += prev_x - new_x; + self->priv->y += prev_y - new_y; + + check_terminals (self, &point); + return TRUE; +} + +static gboolean +on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data) +{ + DrawData data; + + data.cr = gdk_cairo_create (widget->window); + data.self = LD_DIAGRAM_VIEW (widget); + data.scale = ld_diagram_view_get_scale_in_px (data.self); + data.exposed_rect.x = event->area.x; + data.exposed_rect.y = event->area.y; + data.exposed_rect.width = event->area.width; + data.exposed_rect.height = event->area.height; + + gdk_cairo_rectangle (data.cr, &event->area); + cairo_clip (data.cr); + + color_apply (COLOR_GET (data.self, COLOR_BASE), data.cr); + cairo_paint (data.cr); + + draw_grid (widget, &data); + draw_diagram (widget, &data); + draw_terminal (widget, &data); + + if (data.self->priv->operation == OPER_SELECT) + oper_select_draw (widget, &data); + + cairo_destroy (data.cr); + return FALSE; +} + +static void +draw_grid (GtkWidget *widget, DrawData *data) +{ + gdouble grid_step; + gint grid_factor; + gdouble x_init, y_init; + gdouble x, y; + cairo_surface_t *grid_surface; + gint stride; + unsigned char *pixels; + guint32 color; + + grid_step = data->scale; + grid_factor = 1; + while (grid_step < 5) + { + grid_step *= 5; + grid_factor *= 5; + } + + /* Paint manually on our own raster surface for speed. */ + stride = cairo_format_stride_for_width + (CAIRO_FORMAT_ARGB32, data->exposed_rect.width); + pixels = g_malloc0 (stride * data->exposed_rect.height); + grid_surface = cairo_image_surface_create_for_data + (pixels, CAIRO_FORMAT_ARGB32, + data->exposed_rect.width, data->exposed_rect.height, stride); + + /* Get coordinates of the top-left point. */ + ld_diagram_view_widget_to_diagram_coords (data->self, + data->exposed_rect.x, data->exposed_rect.y, &x_init, &y_init); + + x_init = ceil (x_init); + x_init = x_init - (gint) x_init % grid_factor; + y_init = ceil (y_init); + y_init = y_init - (gint) y_init % grid_factor; + + ld_diagram_view_diagram_to_widget_coords (data->self, + x_init, y_init, &x_init, &y_init); + + x_init -= data->exposed_rect.x; + y_init -= data->exposed_rect.y; + + while (x_init < 0) + x_init += grid_step; + while (y_init < 0) + y_init += grid_step; + + color = color_to_cairo_argb (COLOR_GET (data->self, COLOR_GRID)); + + for (x = x_init; x < data->exposed_rect.width; x += grid_step) + for (y = y_init; y < data->exposed_rect.height; y += grid_step) + *((guint32 *) (pixels + stride * (gint) y) + (gint) x) = color; + + cairo_set_source_surface (data->cr, grid_surface, + data->exposed_rect.x, data->exposed_rect.y); + cairo_paint (data->cr); + + cairo_surface_destroy (grid_surface); + g_free (pixels); +} + +static void +draw_terminal (GtkWidget *widget, DrawData *data) +{ + LdDiagramViewPrivate *priv; + LdPoint widget_coords; + + priv = data->self->priv; + if (!priv->terminal_hovered) + return; + + color_apply (COLOR_GET (data->self, COLOR_TERMINAL), data->cr); + cairo_set_line_width (data->cr, 1); + + cairo_new_path (data->cr); + ld_diagram_view_diagram_to_widget_coords (data->self, + priv->terminal.x, priv->terminal.y, + &widget_coords.x, &widget_coords.y); + cairo_arc (data->cr, widget_coords.x, widget_coords.y, + TERMINAL_RADIUS, 0, 2 * G_PI); + cairo_stroke (data->cr); +} + +static void +draw_diagram (GtkWidget *widget, DrawData *data) +{ + GList *objects, *iter; + + if (!data->self->priv->diagram) + return; + + cairo_save (data->cr); + cairo_set_line_width (data->cr, 1 / data->scale); + + /* Draw objects from the diagram, from bottom to top. */ + objects = (GList *) ld_diagram_get_objects (data->self->priv->diagram); + for (iter = objects; iter; iter = g_list_next (iter)) + draw_object (LD_DIAGRAM_OBJECT (iter->data), data); + + switch (data->self->priv->operation) + { + AddObjectData *add_data; + ConnectData *connect_data; + + case OPER_ADD_OBJECT: + add_data = &OPER_DATA (data->self, add_object); + if (add_data->visible) + draw_object (add_data->object, data); + break; + case OPER_CONNECT: + connect_data = &OPER_DATA (data->self, connect); + draw_object (LD_DIAGRAM_OBJECT (connect_data->connection), data); + break; + } + + cairo_restore (data->cr); +} + +static void +draw_object (LdDiagramObject *diagram_object, DrawData *data) +{ + g_return_if_fail (LD_IS_DIAGRAM_OBJECT (diagram_object)); + g_return_if_fail (data != NULL); + + if (is_object_selected (data->self, diagram_object)) + color_apply (COLOR_GET (data->self, COLOR_SELECTION), data->cr); + else + color_apply (COLOR_GET (data->self, COLOR_OBJECT), data->cr); + + if (LD_IS_DIAGRAM_SYMBOL (diagram_object)) + draw_symbol (LD_DIAGRAM_SYMBOL (diagram_object), data); + else if (LD_IS_DIAGRAM_CONNECTION (diagram_object)) + draw_connection (LD_DIAGRAM_CONNECTION (diagram_object), data); +} + +static void +draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data) +{ + LdSymbol *symbol; + LdRectangle clip_rect; + gdouble x, y; + gint rotation; + + symbol = resolve_symbol (data->self, diagram_symbol); + + /* TODO: Resolve this better; draw a cross or whatever. */ + if (!symbol) + { + gchar *klass; + + klass = ld_diagram_symbol_get_class (diagram_symbol); + g_warning ("cannot find symbol `%s' in the library", klass); + g_free (klass); + return; + } + + if (!get_symbol_clip_area (data->self, diagram_symbol, &clip_rect) + || !ld_rectangle_intersects (&clip_rect, &data->exposed_rect)) + return; + + cairo_save (data->cr); + + cairo_rectangle (data->cr, clip_rect.x, clip_rect.y, + clip_rect.width, clip_rect.height); + cairo_clip (data->cr); + + g_object_get (diagram_symbol, "x", &x, "y", &y, + "rotation", &rotation, NULL); + ld_diagram_view_diagram_to_widget_coords (data->self, x, y, &x, &y); + cairo_translate (data->cr, x, y); + cairo_scale (data->cr, data->scale, data->scale); + + switch (rotation) + { + case LD_DIAGRAM_SYMBOL_ROTATION_90: + cairo_rotate (data->cr, G_PI * 0.5); + break; + case LD_DIAGRAM_SYMBOL_ROTATION_180: + cairo_rotate (data->cr, G_PI); + break; + case LD_DIAGRAM_SYMBOL_ROTATION_270: + cairo_rotate (data->cr, G_PI * 1.5); + break; + } + + ld_symbol_draw (symbol, data->cr); + cairo_restore (data->cr); +} + +static void +draw_connection (LdDiagramConnection *connection, DrawData *data) +{ + LdRectangle clip_rect; + LdPointArray *points; + gdouble x, y; + guint i; + + if (!get_connection_clip_area (data->self, connection, &clip_rect) + || !ld_rectangle_intersects (&clip_rect, &data->exposed_rect)) + return; + + points = ld_diagram_connection_get_points (connection); + if (points->length < 2) + goto draw_connection_end; + + cairo_save (data->cr); + + g_object_get (connection, "x", &x, "y", &y, NULL); + ld_diagram_view_diagram_to_widget_coords (data->self, x, y, &x, &y); + cairo_translate (data->cr, x, y); + cairo_scale (data->cr, data->scale, data->scale); + + for (i = 1; i < points->length; i++) + { + cairo_move_to (data->cr, + points->points[i - 1].x, + points->points[i - 1].y); + cairo_line_to (data->cr, + points->points[i].x, + points->points[i].y); + cairo_stroke (data->cr); + } + cairo_restore (data->cr); + +draw_connection_end: + ld_point_array_free (points); + return; +} |