volker böhm

i'm using ptinrect inside the mousedrag function to see if while dragging the mouse is inside the rect of my ui object.

if i pass the pt struct that is returned to the mousedrag function directly to _ptinrect, like in the following example, i get strange results. ptinrect sometimes returns false, although the mouse is still inside the object.

void slider01_mousedrag(t_slider01 *x, t_object *patcherview, t_pt pt, long modifiers)
{
    t_rect rect;
    jbox_get_rect_for_view((t_object *)x, patcherview, &rect);

    // test to see if mouse is still inside the object
    if (jgraphics_ptinrect(pt2, rect)) {
        post("mouse: in rect");
    } else {
        post("mouse: NOT in rect");
    }
    jbox_redraw((t_jbox *)x);
}

after some fiddling i found that if i add the x/y offset of _rect to the _pt i pass to ptinrect, the issue is resolved (see example below).

so, is ptinrect really designed to compare the global (instead of local) mouse position to the rect of the object - or is this a bug?

void slider01_mousedrag(t_slider01 *x, t_object *patcherview, t_pt pt, long modifiers)
{
    t_rect rect;

    jbox_get_rect_for_view((t_object *)x, patcherview, &rect);

    t_pt pt2;
    pt2.x = pt.x+rect.x;
    pt2.y = pt.y+rect.y;

    if (jgraphics_ptinrect(pt2, rect)) {
        post("mousemove: in rect");
    } else {
        post("mousemove: NOT in rect");
    }
    jbox_redraw((t_jbox *)x);
}

void slider01_mousedrag(t_slider01 *x, t_object *patcherview, t_pt pt, long modifiers)
{
	t_rect rect;
	jbox_get_rect_for_view((t_object *)x, patcherview, &rect);

	// test to see if mouse is still inside the object
	if (jgraphics_ptinrect(pt2, rect)) {
		post("mouse: in rect");
	} else {
		post("mouse: NOT in rect");
	}
	jbox_redraw((t_jbox *)x);
}

after some fiddling i found that if i add the x/y offset of _rect to the _pt i pass to ptinrect, the issue is resolved (see example below).
so, is ptinrect really designed to compare the global (instead of local) mouse position to the rect of the object - or is this a bug?
vb

void slider01_mousedrag(t_slider01 *x, t_object *patcherview, t_pt pt, long modifiers)
{
	t_rect rect;

	jbox_get_rect_for_view((t_object *)x, patcherview, &rect);

	t_pt pt2;
	pt2.x = pt.x+rect.x;
	pt2.y = pt.y+rect.y;

	if (jgraphics_ptinrect(pt2, rect)) {
		post("mousemove: in rect");
	} else {
		post("mousemove: NOT in rect");
	}
	jbox_redraw((t_jbox *)x);
}

ptinrect-confusion

Exactly ptinrect check also the x and y. You might want use to use your own to only test the position between 0 and height/width.

If all you want to do is to check if the cursor is inside your UI object rect, you should be using the mouseenter and mouseleave methods.

Luigi Castelli wrote on Tue, 21 April 2009 16:51

if i move the cursor over the object, press the mouse and drag it outside the object, mouseenter/leave (naturally) won't notify.

Luigi Castelli wrote on Tue, 21 April 2009 16:51If all you want to do is to check if the cursor is inside your UI object rect, you should be using the mouseenter and mouseleave methods.

yes, but these don't work for dragging.
if i move the cursor over the object, press the mouse and drag it outside the object, mouseenter/leave (naturally) won't notify.


ptinrect confusion