From 61ae34236a56245e49ed5796a204045fab254fcb Mon Sep 17 00:00:00 2001 From: Přemysl Janouch Date: Sun, 9 Jan 2011 04:50:58 +0100 Subject: Highlight symbol terminals on mouse hover. --- src/ld-canvas.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) diff --git a/src/ld-canvas.c b/src/ld-canvas.c index 9ee7d5b..7d79fec 100644 --- a/src/ld-canvas.c +++ b/src/ld-canvas.c @@ -46,6 +46,11 @@ /* 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: * @@ -73,6 +78,7 @@ enum COLOR_GRID, COLOR_OBJECT, COLOR_SELECTION, + COLOR_TERMINAL, COLOR_COUNT }; @@ -112,6 +118,9 @@ struct _LdCanvasPrivate gdouble y; gdouble zoom; + LdPoint terminal; + gboolean terminal_highlighted; + gint operation; union { @@ -200,8 +209,10 @@ static gboolean get_object_area (LdCanvas *self, LdDiagramObject *object, LdRectangle *rect); static gboolean object_hit_test (LdCanvas *self, LdDiagramObject *object, gdouble x, gdouble y); +static void check_terminals (LdCanvas *self, gdouble x, gdouble y); static void queue_draw (LdCanvas *self, LdRectangle *rect); static void queue_object_draw (LdCanvas *self, LdDiagramObject *object); +static void queue_terminal_draw (LdCanvas *self, LdPoint *terminal); static void ld_canvas_real_cancel_operation (LdCanvas *self); static void ld_canvas_add_object_end (LdCanvas *self); @@ -210,6 +221,7 @@ 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); @@ -302,6 +314,7 @@ ld_canvas_init (LdCanvas *self) ld_canvas_color_set (COLOR_GET (self, COLOR_GRID), 0.5, 0.5, 0.5, 1); ld_canvas_color_set (COLOR_GET (self, COLOR_OBJECT), 0, 0, 0, 1); ld_canvas_color_set (COLOR_GET (self, COLOR_SELECTION), 0, 0, 1, 1); + ld_canvas_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); @@ -918,6 +931,72 @@ object_hit_test (LdCanvas *self, LdDiagramObject *object, gdouble x, gdouble y) return ld_rectangle_contains (&rect, x, y); } +static void +check_terminals (LdCanvas *self, gdouble x, gdouble y) +{ + GSList *objects, *iter; + LdDiagramSymbol *closest_symbol = NULL; + gdouble closest_distance = TERMINAL_HOVER_TOLERANCE; + LdPoint closest_terminal; + + objects = (GSList *) ld_diagram_get_objects (self->priv->diagram); + for (iter = objects; iter; iter = g_slist_next (iter)) + { + LdDiagramObject *diagram_object; + gdouble object_x, object_y; + LdDiagramSymbol *diagram_symbol; + LdSymbol *symbol; + const LdPointArray *terminals; + gint i; + + if (!LD_IS_DIAGRAM_SYMBOL (iter->data)) + continue; + + diagram_symbol = LD_DIAGRAM_SYMBOL (iter->data); + symbol = resolve_diagram_symbol (self, diagram_symbol); + if (!symbol) + continue; + + diagram_object = LD_DIAGRAM_OBJECT (iter->data); + object_x = ld_diagram_object_get_x (diagram_object); + object_y = ld_diagram_object_get_y (diagram_object); + + terminals = ld_symbol_get_terminals (symbol); + + for (i = 0; i < terminals->num_points; i++) + { + LdPoint cur_term; + gdouble distance; + + cur_term = terminals->points[i]; + cur_term.x += object_x; + cur_term.y += object_y; + ld_canvas_diagram_to_widget_coords (self, + cur_term.x, cur_term.y, &cur_term.x, &cur_term.y); + + distance = ld_point_distance (&cur_term, x, y); + if (distance <= closest_distance) + { + closest_symbol = diagram_symbol; + closest_distance = distance; + closest_terminal = cur_term; + } + } + } + + if (self->priv->terminal_highlighted) + queue_terminal_draw (self, &self->priv->terminal); + + if (closest_symbol) + { + self->priv->terminal_highlighted = TRUE; + self->priv->terminal = closest_terminal; + queue_terminal_draw (self, &closest_terminal); + } + else + self->priv->terminal_highlighted = FALSE; +} + static void queue_draw (LdCanvas *self, LdRectangle *rect) { @@ -942,6 +1021,18 @@ queue_object_draw (LdCanvas *self, LdDiagramObject *object) } } +static void +queue_terminal_draw (LdCanvas *self, LdPoint *terminal) +{ + LdRectangle rect; + + rect.x = terminal->x - TERMINAL_RADIUS; + rect.y = terminal->y - TERMINAL_RADIUS; + rect.width = 2 * TERMINAL_RADIUS; + rect.height = 2 * TERMINAL_RADIUS; + queue_draw (self, &rect); +} + static gboolean on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data) { @@ -960,6 +1051,9 @@ on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data) move_object_to_coords (self, data->object, event->x, event->y); queue_object_draw (self, data->object); break; + case OPER_0: + check_terminals (self, event->x, event->y); + break; } return FALSE; } @@ -1051,6 +1145,7 @@ on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data) } update_adjustments (self); + check_terminals (self, event->x, event->y); gtk_widget_queue_draw (widget); return TRUE; } @@ -1076,6 +1171,7 @@ on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data) draw_grid (widget, &data); draw_diagram (widget, &data); + draw_terminal (widget, &data); cairo_destroy (data.cr); return FALSE; @@ -1116,6 +1212,24 @@ draw_grid (GtkWidget *widget, DrawData *data) cairo_stroke (data->cr); } +static void +draw_terminal (GtkWidget *widget, DrawData *data) +{ + LdCanvasPrivate *priv; + + priv = data->self->priv; + if (!priv->terminal_highlighted) + return; + + ld_canvas_color_apply (COLOR_GET (data->self, COLOR_TERMINAL), data->cr); + cairo_set_line_width (data->cr, 1); + + cairo_new_path (data->cr); + cairo_arc (data->cr, priv->terminal.x, priv->terminal.y, + TERMINAL_RADIUS, 0, 2 * G_PI); + cairo_stroke (data->cr); +} + static void draw_diagram (GtkWidget *widget, DrawData *data) { -- cgit v1.2.3-70-g09d2