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Split in-out parameters into separate in and out.

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In functions:
ld_canvas_diagram_to_widget_coords()
ld_canvas_widget_to_diagram_coords()
This commit is contained in:
Přemysl Eric Janouch
2011-01-03 05:57:22 +01:00
parent 9d505f0a87
commit 2cb570f894
2 changed files with 29 additions and 25 deletions
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50
src/ld-canvas.c
View File

@@ -488,21 +488,24 @@ ld_canvas_get_scale_in_px (LdCanvas *self)
/**
* ld_canvas_widget_to_diagram_coords:
* @self: An #LdCanvas object.
* @x: The X coordinate to be translated.
* @y: The Y coordinate to be translated.
* @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 coordinates located inside the canvas window
* into diagram coordinates.
*/
void
ld_canvas_widget_to_diagram_coords (LdCanvas *self, gdouble *x, gdouble *y)
ld_canvas_widget_to_diagram_coords (LdCanvas *self,
gdouble wx, gdouble wy, gdouble *dx, gdouble *dy)
{
GtkWidget *widget;
gdouble scale;
g_return_if_fail (LD_IS_CANVAS (self));
g_return_if_fail (x != NULL);
g_return_if_fail (y != NULL);
g_return_if_fail (dx != NULL);
g_return_if_fail (dy != NULL);
widget = GTK_WIDGET (self);
scale = ld_canvas_get_scale_in_px (self);
@@ -511,35 +514,37 @@ ld_canvas_widget_to_diagram_coords (LdCanvas *self, gdouble *x, gdouble *y)
* translate the given X and Y coordinates to this center and then scale
* 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;
*dx = self->priv->x + (wx - (widget->allocation.width * 0.5)) / scale;
*dy = self->priv->y + (wy - (widget->allocation.height * 0.5)) / scale;
}
/**
* ld_canvas_diagram_to_widget_coords:
* @self: An #LdCanvas object.
* @x: The X coordinate to be translated.
* @y: The Y coordinate to be translated.
* @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 canvas coordinates.
*/
void
ld_canvas_diagram_to_widget_coords (LdCanvas *self,
gdouble *x, gdouble *y)
gdouble dx, gdouble dy, gdouble *wx, gdouble *wy)
{
GtkWidget *widget;
gdouble scale;
g_return_if_fail (LD_IS_CANVAS (self));
g_return_if_fail (x != NULL);
g_return_if_fail (y != NULL);
g_return_if_fail (wx != NULL);
g_return_if_fail (wy != NULL);
widget = GTK_WIDGET (self);
scale = ld_canvas_get_scale_in_px (self);
/* 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;
*wx = scale * (dx - self->priv->x) + 0.5 * widget->allocation.width;
*wy = scale * (dy - self->priv->y) + 0.5 * widget->allocation.height;
}
static gboolean
@@ -580,12 +585,10 @@ draw_grid (GtkWidget *widget, DrawData *data)
cairo_set_line_cap (data->cr, CAIRO_LINE_CAP_ROUND);
/* 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);
ld_canvas_widget_to_diagram_coords (data->self,
data->exposed_rect.x, data->exposed_rect.y, &x_init, &y_init);
ld_canvas_diagram_to_widget_coords (data->self,
ceil (x_init), ceil (y_init), &x_init, &y_init);
/* Iterate over all the points. */
for (x = x_init; x <= data->exposed_rect.x + data->exposed_rect.width;
@@ -651,9 +654,10 @@ draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data)
return;
}
x = ld_diagram_object_get_x (LD_DIAGRAM_OBJECT (diagram_symbol));
y = ld_diagram_object_get_y (LD_DIAGRAM_OBJECT (diagram_symbol));
ld_canvas_diagram_to_widget_coords (data->self, &x, &y);
ld_canvas_diagram_to_widget_coords (data->self,
ld_diagram_object_get_x (LD_DIAGRAM_OBJECT (diagram_symbol)),
ld_diagram_object_get_y (LD_DIAGRAM_OBJECT (diagram_symbol)),
&x, &y);
/* TODO: Rotate the space for other orientations. */
cairo_save (data->cr);

4
src/ld-canvas.h
View File

@@ -71,9 +71,9 @@ void ld_canvas_set_library (LdCanvas *self, LdLibrary *library);
LdLibrary *ld_canvas_get_library (LdCanvas *self);
void ld_canvas_widget_to_diagram_coords (LdCanvas *self,
gdouble *x, gdouble *y);
gdouble wx, gdouble wy, gdouble *dx, gdouble *dy);
void ld_canvas_diagram_to_widget_coords (LdCanvas *self,
gdouble *x, gdouble *y);
gdouble dx, gdouble dy, gdouble *wx, gdouble *wy);
/* TODO: The rest of the interface. */