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app: add gimp_canvas_item_transform_distance() and transform_distance_square() 

to allow items to measure distances, exactly like the identical
GimpDrawTool API.
This commit is contained in:
Michael Natterer 2017-06-10 21:55:40 +02:00
parent 53a84bc6ea
commit a4d2acac38
2 changed files with 69 additions and 0 deletions
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57
app/display/gimpcanvasitem.c
View File

@ -585,6 +585,63 @@ gimp_canvas_item_transform_xy_f (GimpCanvasItem *item,
gimp_display_shell_zoom_xy_f (item->private->shell, x, y, tx, ty);
}
/**
* gimp_canvas_item_transform_distance:
* @item: a #GimpCanvasItem
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* If you just need to compare distances, consider to use
* gimp_canvas_item_transform_distance_square() instead.
*
* Returns: the distance between the given points in display coordinates
**/
gdouble
gimp_canvas_item_transform_distance (GimpCanvasItem *item,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
return sqrt (gimp_canvas_item_transform_distance_square (item,
x1, y1, x2, y2));
}
/**
* gimp_canvas_item_transform_distance_square:
* @item: a #GimpCanvasItem
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* This function is more effective than
* gimp_canvas_item_transform_distance() as it doesn't perform a
* sqrt(). Use this if you just need to compare distances.
*
* Returns: the square of the distance between the given points in
* display coordinates
**/
gdouble
gimp_canvas_item_transform_distance_square (GimpCanvasItem *item,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
gdouble tx1, ty1;
gdouble tx2, ty2;
g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), 0.0);
gimp_canvas_item_transform_xy_f (item, x1, y1, &tx1, &ty1);
gimp_canvas_item_transform_xy_f (item, x2, y2, &tx2, &ty2);
return SQR (tx2 - tx1) + SQR (ty2 - ty1);
}
/* protected functions */

12
app/display/gimpcanvasitem.h
View File

@ -113,6 +113,18 @@ void gimp_canvas_item_transform_xy_f (GimpCanvasItem *item,
gdouble y,
gdouble *tx,
gdouble *ty);
gdouble gimp_canvas_item_transform_distance
(GimpCanvasItem *item,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2);
gdouble gimp_canvas_item_transform_distance_square
(GimpCanvasItem *item,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2);
/* protected */