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lollis: potentially clip circle with a bounding parent

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This commit is contained in:
Paul Davis 2023-06-21 16:18:14 -06:00
parent 62bb8ccbeb
commit a6c1a3d9d0
2 changed files with 24 additions and 2 deletions
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3
libs/canvas/canvas/lollipop.h
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@ -54,10 +54,13 @@ public:
Coord y0 () const { return _center.y; }
Coord y1 () const { return _center.y + _length; }
void set_bounding_parent (Item*);
private:
Duple _center;
Coord _radius;
Coord _length;
Item* bounding_parent;
};
}

23
libs/canvas/lollipop.cc
View File

@ -33,6 +33,7 @@ Lollipop::Lollipop (Canvas* c)
: Item (c)
, _radius (8)
, _length (0)
, bounding_parent (0)
{
}
@ -40,9 +41,16 @@ Lollipop::Lollipop (Item* parent)
: Item (parent)
, _radius (8)
, _length (0)
, bounding_parent (0)
{
}
void
Lollipop::set_bounding_parent (Item* bp)
{
bounding_parent = bp;
}
void
Lollipop::compute_bounding_box () const
{
@ -67,10 +75,17 @@ Lollipop::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
/* the line */
context->move_to (l.x, l.y + _radius);
context->line_to (l.x, l.y + _length - _radius);
context->line_to (l.x, l.y + _length);
context->stroke ();
/* the circle */
/* the circle: clip to avoid weirdness at top and bottom of parent */
if (bounding_parent) {
context->save ();
Rect b (bounding_parent->item_to_window (bounding_parent->bounding_box()));
context->rectangle (b.x0, b.y0, b.width(), b.height());
context->clip();
}
context->arc (p.x, p.y, _radius, 0.0 * (M_PI/180.0), 360.0 * (M_PI/180.0));
@ -88,6 +103,10 @@ Lollipop::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
context->stroke ();
}
if (bounding_parent) {
context->restore ();
}
render_children (area, context);
}