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LdCanvas maintenance.

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* Rename ld_canvas_translate_*_coordinates() to ld_canvas_*_to_*_coords().
* Add missing parameter assertions to those functions.
* Rename local variables in draw_grid().
* Use gdk_cairo_rectangle() in expose-event handler.
* Update comments.
This commit is contained in:
Přemysl Eric Janouch 2010-12-18 05:23:05 +01:00
parent f2f308f2f5
commit 9178fb8d81
2 changed files with 27 additions and 25 deletions
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48
src/ld-canvas.c
View File

@ -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);

4
src/ld-canvas.h
View File

@ -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. */