{
}
-void
-Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
+Rect
+Rectangle::get_self_for_render () const
{
/* In general, a Rectangle will have a _position of (0,0) within its
parent, and its extent is actually defined by _rect. But in the
unusual case that _position is set to something other than (0,0),
we should take that into account when rendering.
*/
- Rect self = item_to_window (_rect.translate (_position));
+
+ return item_to_window (_rect.translate (_position), false);
+}
+
+void
+Rectangle::render_self (Rect const & area, Cairo::RefPtr<Cairo::Context> context, Rect self) const
+{
boost::optional<Rect> r = self.intersection (area);
if (!r) {
context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
context->fill ();
- }
-
- if (_outline) {
+ }
+
+ if (_outline && _outline_width && _outline_what) {
setup_outline_context (context);
-
+
/* the goal here is that if the border is 1 pixel
* thick, it will precisely align with the corner
* coordinates of the rectangle. So if the rectangle
* has a left edge at 0 and a right edge at 10, then
- * the left edge must span -0.5..+0.5, the right edge
- * must span 9.5..10.5 (i.e. the single full color
- * pixel is precisely aligned with 0 and 10
- * respectively).
+ * the left edge must span 0..1, the right edge
+ * must span 10..11 because the first and final pixels
+ * to be colored are actually "at" 0.5 and 10.5 (midway
+ * between the integer coordinates).
*
- * we have to shift left/up in all cases, which means
- * subtraction along both axes (i.e. edge at
- * N, outline must start at N-0.5).
- *
- * see the cairo FAQ on single pixel lines to see why we do
- * the 0.5 pixel additions.
+ * See the Cairo FAQ on single pixel lines for more
+ * detail.
*/
- self = self.translate (Duple (-0.5, -0.5));
+ if (fmod (_outline_width, 2.0) != 0.0) {
+ const double shift = _outline_width * 0.5;
+ self = self.translate (Duple (shift, shift));
+ }
- std::cerr << "Outline using " << self << " from " << _rect << std::endl;
-
if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
-
+
context->rectangle (self.x0, self.y0, self.width(), self.height());
} else {
context->move_to (self.x0, self.y0);
context->line_to (self.x0, self.y1);
}
-
+
if (_outline_what & TOP) {
context->move_to (self.x0, self.y0);
context->line_to (self.x1, self.y0);
context->move_to (self.x0, self.y1);
context->line_to (self.x1, self.y1);
}
-
+
if (_outline_what & RIGHT) {
context->move_to (self.x1, self.y0);
context->line_to (self.x1, self.y1);
}
}
-
+
context->stroke ();
}
}
+void
+Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
+{
+ render_self (area, context, get_self_for_render ());
+}
+
void
Rectangle::compute_bounding_box () const
{
if (!_rect.empty()) {
Rect r = _rect.fix ();
- /* take into acount the 0.5 addition to the bounding
- box for the right and bottom edges, see ::render() above
+ /* if the outline is 1 pixel, then the actual
+ bounding box is 0.5 pixels outside the stated
+ corners of the rectangle.
+
+ if the outline is 2 pixels, then the actual
+ bounding box is 1.0 pixels outside the stated
+ corners of the rectangle (so that the middle
+ of the 2 pixel wide border passes through
+ the corners, alternatively described as 1 row
+ of pixels outside of the corners, and 1 row
+ inside).
+
+ if the outline is 3 pixels, then the actual
+ bounding box is 1.5 outside the stated corners
+ of the rectangle (so that the middle row of
+ pixels of the border passes through the corners).
+
+ if the outline is 4 pixels, then the actual bounding
+ box is 2.0 pixels outside the stated corners
+ of the rectangle, so that the border consists
+ of 2 pixels outside the corners and 2 pixels inside.
+
+ hence ... the bounding box is width * 0.5 larger
+ than the rectangle itself.
*/
- r = r.expand (1.0);
-
- _bounding_box = r;
+ _bounding_box = r.expand (1.0 + _outline_width * 0.5);
}
_bounding_box_dirty = false;
*/
if (r != _rect) {
-
+
begin_change ();
-
+
_rect = r;
-
+
_bounding_box_dirty = true;
end_change ();
}
{
if (x0 != _rect.x0) {
begin_change ();
-
+
_rect.x0 = x0;
-
+
_bounding_box_dirty = true;
end_change ();
}
{
if (y0 != _rect.y0) {
begin_change ();
-
+
_rect.y0 = y0;
-
+
_bounding_box_dirty = true;
end_change();
}
{
if (x1 != _rect.x1) {
begin_change ();
-
+
_rect.x1 = x1;
-
+
_bounding_box_dirty = true;
end_change ();
}
{
if (y1 != _rect.y1) {
begin_change ();
-
+
_rect.y1 = y1;
-
+
_bounding_box_dirty = true;
end_change ();
}
}
}
+double
+Rectangle::vertical_fraction (double y) const
+{
+ /* y is in canvas coordinates */
+
+ Duple i (canvas_to_item (Duple (0, y)));
+ boost::optional<Rect> r = bounding_box();
+ if (!r) {
+ return 0; /* not really correct, but what else can we do? */
+ }
+
+ Rect bbox (r.get());
+
+ if (i.y < bbox.y0 || i.y >= bbox.y1) {
+ return 0;
+ }
+
+ /* convert to fit Cairo origin model (origin at upper left)
+ */
+
+ return 1.0 - ((i.y - bbox.y0) / bbox.height());
+}
projects / ardour.git / blobdiff