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-rw-r--r--src/ld-canvas.c48
-rw-r--r--src/ld-canvas.h4
2 files changed, 27 insertions, 25 deletions
diff --git a/src/ld-canvas.c b/src/ld-canvas.c
index bc93902..0667adb 100644
--- a/src/ld-canvas.c
+++ b/src/ld-canvas.c
@@ -27,7 +27,7 @@
* @short_description: A canvas.
* @see_also: #LdDiagram
*
- * #LdCanvas is used for displaying #LdDiagram objects.
+ * #LdCanvas displays and enables the user to manipulate with an #LdDiagram.
*/
/* Milimetres per inch. */
@@ -478,7 +478,7 @@ ld_canvas_get_scale_in_px (LdCanvas *self)
}
/**
- * ld_canvas_translate_canvas_coordinates:
+ * ld_canvas_widget_to_diagram_coords:
* @self: An #LdCanvas object.
* @x: The X coordinate to be translated.
* @y: The Y coordinate to be translated.
@@ -487,27 +487,28 @@ ld_canvas_get_scale_in_px (LdCanvas *self)
* into diagram coordinates.
*/
void
-ld_canvas_translate_canvas_coordinates (LdCanvas *self, gdouble *x, gdouble *y)
+ld_canvas_widget_to_diagram_coords (LdCanvas *self, gdouble *x, gdouble *y)
{
GtkWidget *widget;
gdouble scale;
g_return_if_fail (LD_IS_CANVAS (self));
+ g_return_if_fail (x != NULL);
+ g_return_if_fail (y != NULL);
widget = GTK_WIDGET (self);
scale = ld_canvas_get_scale_in_px (self);
/* We know diagram coordinates of the center of the canvas, so we may
* translate the given X and Y coordinates to this center and then scale
- * them by dividing them by the length of the base unit in pixels
- * times zoom of the canvas.
+ * them by dividing them by the current scale.
*/
*x = self->priv->x + (*x - (widget->allocation.width * 0.5)) / scale;
*y = self->priv->y + (*y - (widget->allocation.height * 0.5)) / scale;
}
/**
- * ld_canvas_translate_diagram_coordinates:
+ * ld_canvas_diagram_to_widget_coords:
* @self: An #LdCanvas object.
* @x: The X coordinate to be translated.
* @y: The Y coordinate to be translated.
@@ -515,18 +516,20 @@ ld_canvas_translate_canvas_coordinates (LdCanvas *self, gdouble *x, gdouble *y)
* Translate diagram coordinates into canvas coordinates.
*/
void
-ld_canvas_translate_diagram_coordinates (LdCanvas *self,
+ld_canvas_diagram_to_widget_coords (LdCanvas *self,
gdouble *x, gdouble *y)
{
GtkWidget *widget;
gdouble scale;
g_return_if_fail (LD_IS_CANVAS (self));
+ g_return_if_fail (x != NULL);
+ g_return_if_fail (y != NULL);
widget = GTK_WIDGET (self);
scale = ld_canvas_get_scale_in_px (self);
- /* Just the reversal of ld_canvas_translate_canvas_coordinates(). */
+ /* Just the reversal of ld_canvas_widget_to_diagram_coords(). */
*x = scale * (*x - self->priv->x) + 0.5 * widget->allocation.width;
*y = scale * (*y - self->priv->y) + 0.5 * widget->allocation.height;
}
@@ -544,8 +547,7 @@ on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
data.exposed_rect.width = event->area.width;
data.exposed_rect.height = event->area.height;
- cairo_rectangle (data.cr, data.exposed_rect.x, data.exposed_rect.y,
- data.exposed_rect.width, data.exposed_rect.height);
+ gdk_cairo_rectangle (data.cr, &event->area);
cairo_clip (data.cr);
/* Paint the background white. */
@@ -562,27 +564,27 @@ on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
static void
draw_grid (GtkWidget *widget, DrawData *data)
{
- gdouble x_top, y_top;
+ gdouble x_init, y_init;
gdouble x, y;
cairo_set_source_rgb (data->cr, 0.5, 0.5, 0.5);
cairo_set_line_width (data->cr, 1);
cairo_set_line_cap (data->cr, CAIRO_LINE_CAP_ROUND);
- /* Get coordinates of the most top-left grid point. */
- x_top = data->exposed_rect.x;
- y_top = data->exposed_rect.y;
- ld_canvas_translate_canvas_coordinates (data->self, &x_top, &y_top);
- x_top = ceil (x_top);
- y_top = ceil (y_top);
- ld_canvas_translate_diagram_coordinates (data->self, &x_top, &y_top);
+ /* Get coordinates of the top-left point. */
+ x_init = data->exposed_rect.x;
+ y_init = data->exposed_rect.y;
+ ld_canvas_widget_to_diagram_coords (data->self, &x_init, &y_init);
+ x_init = ceil (x_init);
+ y_init = ceil (y_init);
+ ld_canvas_diagram_to_widget_coords (data->self, &x_init, &y_init);
/* Iterate over all the points. */
- for (x = x_top; x <= data->exposed_rect.x + data->exposed_rect.width;
- x += data->scale)
+ for (x = x_init; x <= data->exposed_rect.x + data->exposed_rect.width;
+ x += data->scale)
{
- for (y = y_top; y <= data->exposed_rect.y + data->exposed_rect.height;
- y += data->scale)
+ for (y = y_init; y <= data->exposed_rect.y + data->exposed_rect.height;
+ y += data->scale)
{
cairo_move_to (data->cr, x, y);
cairo_line_to (data->cr, x, y);
@@ -643,7 +645,7 @@ draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data)
x = ld_diagram_object_get_x (LD_DIAGRAM_OBJECT (diagram_symbol));
y = ld_diagram_object_get_y (LD_DIAGRAM_OBJECT (diagram_symbol));
- ld_canvas_translate_diagram_coordinates (data->self, &x, &y);
+ ld_canvas_diagram_to_widget_coords (data->self, &x, &y);
/* TODO: Rotate the space for other orientations. */
cairo_save (data->cr);
diff --git a/src/ld-canvas.h b/src/ld-canvas.h
index 6f2c1db..435163a 100644
--- a/src/ld-canvas.h
+++ b/src/ld-canvas.h
@@ -70,9 +70,9 @@ LdDiagram *ld_canvas_get_diagram (LdCanvas *self);
void ld_canvas_set_library (LdCanvas *self, LdLibrary *library);
LdLibrary *ld_canvas_get_library (LdCanvas *self);
-void ld_canvas_translate_canvas_coordinates (LdCanvas *self,
+void ld_canvas_widget_to_diagram_coords (LdCanvas *self,
gdouble *x, gdouble *y);
-void ld_canvas_translate_diagram_coordinates (LdCanvas *self,
+void ld_canvas_diagram_to_widget_coords (LdCanvas *self,
gdouble *x, gdouble *y);
/* TODO: The rest of the interface. */