using namespace std;
using namespace ArdourCanvas;
-Rectangle::Rectangle (Group* parent)
- : Item (parent)
- , Outline (parent)
- , Fill (parent)
+Rectangle::Rectangle (Canvas* c)
+ : Item (c)
+ , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
+{
+}
+
+Rectangle::Rectangle (Canvas* c, Rect const & rect)
+ : Item (c)
+ , _rect (rect)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
{
+}
+Rectangle::Rectangle (Item* parent)
+ : Item (parent)
+ , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
+{
}
-Rectangle::Rectangle (Group* parent, Rect const & rect)
+Rectangle::Rectangle (Item* parent, Rect const & rect)
: Item (parent)
- , Outline (parent)
- , Fill (parent)
, _rect (rect)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
{
-
}
-void
-Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
+Rect
+Rectangle::get_self_for_render () const
{
- /* Cairo goes a little (!) wrong when asked to fill/stroke rectangles that
- * extend way beyond the surface boundaries. To avoid this issue,
- * clamp what we are drawing using the absolute end of the visible
- * canvas, converting to item-space coordinates, of course.
- */
+ /* 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);
- boost::optional<Rect> draw = self.intersection (area);
+ return item_to_window (_rect.translate (_position), false);
+}
- if (_fill && draw) {
- setup_fill_context (context);
+void
+Rectangle::render_self (Rect const & area, Cairo::RefPtr<Cairo::Context> context, Rect self) const
+{
+ boost::optional<Rect> r = self.intersection (area);
+
+ if (!r) {
+ return;
+ }
- context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
-
- if (!_outline) {
- context->fill ();
+ Rect draw = r.get ();
+
+ if (_fill && !_transparent) {
+ if (_stops.empty()) {
+ setup_fill_context (context);
} else {
-
- /* special/common case: outline the entire rectangle is
- * requested, so just use the same path for the fill
- * and stroke.
- */
-
- if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
- context->fill_preserve();
- setup_outline_context (context);
- context->stroke ();
- } else {
- context->fill ();
- }
+ setup_gradient_context (context, self, Duple (draw.x0, draw.y0));
}
+
+ context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
+ context->fill ();
}
if (_outline) {
-
- setup_outline_context (context);
+ 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..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).
+ *
+ * See the Cairo FAQ on single pixel lines for more
+ * detail.
+ */
+
+ if (fmod (_outline_width, 2.0) != 0.0) {
+ const double shift = _outline_width * 0.5;
+ self = self.translate (Duple (shift, shift));
+ }
+
if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
-
- /* if we filled and use full outline, we are already
- * done. otherwise, draw the frame here.
- */
-
- if (!_fill) {
- context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
- context->stroke ();
- }
+ context->rectangle (self.x0, self.y0, self.width(), self.height());
+
} else {
-
+
if (_outline_what & LEFT) {
- context->move_to (draw->x0, draw->y0);
- context->line_to (draw->x0, draw->y1);
+ 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);
+ }
+
if (_outline_what & BOTTOM) {
- context->move_to (draw->x0, draw->y1);
- context->line_to (draw->x1, draw->y1);
+ context->move_to (self.x0, self.y1);
+ context->line_to (self.x1, self.y1);
}
if (_outline_what & RIGHT) {
- context->move_to (draw->x1, draw->y0);
- context->line_to (draw->x1, draw->y1);
+ context->move_to (self.x1, self.y0);
+ context->line_to (self.x1, self.y1);
}
-
- if (_outline_what & TOP) {
- context->move_to (draw->x0, draw->y0);
- context->line_to (draw->x1, draw->y0);
- }
-
- context->stroke ();
}
+
+ 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
{
- Rect r = _rect.fix ();
- _bounding_box = boost::optional<Rect> (r.expand (_outline_width / 2));
-
+ if (!_rect.empty()) {
+ Rect r = _rect.fix ();
+
+ /* 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.
+ */
+
+ _bounding_box = r.expand (1.0 + _outline_width * 0.5);
+ }
+
_bounding_box_dirty = false;
}
/* We don't update the bounding box here; it's just
as cheap to do it when asked.
*/
-
- begin_change ();
-
- _rect = r;
-
- _bounding_box_dirty = true;
- end_change ();
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (set)\n");
+ if (r != _rect) {
+
+ begin_change ();
+
+ _rect = r;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_x0 (Coord x0)
{
- begin_change ();
-
- _rect.x0 = x0;
-
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x0)\n");
+ if (x0 != _rect.x0) {
+ begin_change ();
+
+ _rect.x0 = x0;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_y0 (Coord y0)
{
- begin_change ();
-
- _rect.y0 = y0;
-
- _bounding_box_dirty = true;
- end_change();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y0)\n");
+ if (y0 != _rect.y0) {
+ begin_change ();
+
+ _rect.y0 = y0;
+
+ _bounding_box_dirty = true;
+ end_change();
+ }
}
void
Rectangle::set_x1 (Coord x1)
{
- begin_change ();
-
- _rect.x1 = x1;
-
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x1)\n");
+ if (x1 != _rect.x1) {
+ begin_change ();
+
+ _rect.x1 = x1;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_y1 (Coord y1)
{
- begin_change ();
-
- _rect.y1 = y1;
-
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y1)\n");
+ if (y1 != _rect.y1) {
+ begin_change ();
+
+ _rect.y1 = y1;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_outline_what (What what)
{
- begin_change ();
-
- _outline_what = what;
-
- end_change ();
-}
-
-void
-Rectangle::set_outline_what (int what)
-{
- set_outline_what ((What) what);
+ if (what != _outline_what) {
+ begin_visual_change ();
+ _outline_what = what;
+ end_visual_change ();
+ }
}
-
projects / ardour.git / blobdiff