using namespace std;
using namespace ArdourCanvas;
-Rectangle::Rectangle (Group* 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 (parent)
- , Fill (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))
{
-
+}
+
+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.
+ */
+
+ return item_to_window (_rect.translate (_position), false);
}
void
-Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
+Rectangle::render_self (Rect const & area, Cairo::RefPtr<Cairo::Context> context, Rect self) const
{
- Rect self = item_to_window (_rect);
boost::optional<Rect> r = self.intersection (area);
if (!r) {
- std::cerr << whatami() << '/' << name << " not covered by render area! ... " << self << " vs. " << area << std::endl;
return;
}
Rect draw = r.get ();
- if (_fill) {
+ if (_fill && !_transparent) {
if (_stops.empty()) {
setup_fill_context (context);
} else {
context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
context->fill ();
- }
-
+ }
+
if (_outline) {
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)) {
-
- /* outline must be on pixels (hence 0.5 offset) and
- must be WITHIN coordinates of rect, not outside it
- (hence the -2.0 size adjustment, since we use 1
- pixel on each side for the outline)
- */
- context->rectangle (self.x0 + 0.5, self.y0 + 0.5, self.width() - 1.0, self.height() - 1.0);
+ context->rectangle (self.x0, self.y0, self.width(), self.height());
} else {
- // context->set_line_cap (Cairo::LINE_CAP_SQUARE);
-
- /* see the cairo FAQ on single pixel lines to see why we do
- * this expansion of the perimeter.
- */
-
if (_outline_what & LEFT) {
- /* vertical line: move x-coordinate by 0.5 pixels */
- context->move_to (self.x0 + 0.5, self.y0);
- context->line_to (self.x0 + 0.5, self.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) {
- /* horizontal line: move y-coordinate by 0.5 pixels */
- context->move_to (self.x0, self.y1 - 0.5);
- context->line_to (self.x1, self.y1 - 0.5);
+ context->move_to (self.x0, self.y1);
+ context->line_to (self.x1, self.y1);
}
-
+
if (_outline_what & RIGHT) {
- /* vertical line: move x-coordinate by 0.5 pixels */
- context->move_to (self.x1 - 0.5, self.y0);
- context->line_to (self.x1 - 0.5, self.y1);
- }
-
- if (_outline_what & TOP) {
- /* horizontal line: move y-coordinate by 0.5 pixels */
- context->move_to (self.x0, self.y0 + 0.5);
- context->line_to (self.x1, self.y0 + 0.5);
+ 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 ();
- /* our outlines are always inside our coordinates, but we have
- * to ensure that our bounding box fully *contains* the
- * rectangle
- *
- * XXX: or something like that, waffle.
- *
- */
- _bounding_box = _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 ();
+ if (x0 != _rect.x0) {
+ begin_change ();
- _rect.x0 = x0;
+ _rect.x0 = x0;
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x0)\n");
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_y0 (Coord y0)
{
- begin_change ();
-
- _rect.y0 = y0;
+ if (y0 != _rect.y0) {
+ begin_change ();
- _bounding_box_dirty = true;
- end_change();
+ _rect.y0 = y0;
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y0)\n");
+ _bounding_box_dirty = true;
+ end_change();
+ }
}
void
Rectangle::set_x1 (Coord x1)
{
- begin_change ();
-
- _rect.x1 = x1;
+ if (x1 != _rect.x1) {
+ begin_change ();
- _bounding_box_dirty = true;
- end_change ();
+ _rect.x1 = x1;
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x1)\n");
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_y1 (Coord y1)
{
- begin_change ();
+ if (y1 != _rect.y1) {
+ begin_change ();
- _rect.y1 = y1;
+ _rect.y1 = y1;
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y1)\n");
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Rectangle::set_outline_what (What what)
{
- begin_change ();
-
- _outline_what = what;
-
- end_change ();
+ if (what != _outline_what) {
+ begin_visual_change ();
+ _outline_what = what;
+ end_visual_change ();
+ }
}
-void
-Rectangle::set_outline_what (int what)
+double
+Rectangle::vertical_fraction (double y) const
{
- set_outline_what ((What) what);
-}
+ /* 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