fix crash when copy'ing latent plugins

[ardour.git] / libs / canvas / poly_line.cc

diff --git a/libs/canvas/poly_line.cc b/libs/canvas/poly_line.cc
index bdc4af9c103e5df63863d943156f010f4cf1afbb..c0e233b38f69ac06cc6f43890d5713c65dc470a8 100644 (file)
--- a/libs/canvas/poly_line.cc
+++ b/libs/canvas/poly_line.cc
@@ -17,23 +17,161 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <algorithm>
+
 #include "canvas/poly_line.h"
+#include "canvas/canvas.h"
+#include "canvas/utils.h"
 
 using namespace ArdourCanvas;
 
-PolyLine::PolyLine (Group* parent)
-       : Item (parent)
-       , PolyItem (parent)
+PolyLine::PolyLine (Canvas* c)
+       : PolyItem (c)
+       , _threshold (1.0)
+       , _y1 (0)
+{
+}
+
+PolyLine::PolyLine (Item* parent)
+       : PolyItem (parent)
+       , _threshold (1.0)
+       , _y1 (0)
+{
+}
+
+void
+PolyLine::compute_bounding_box () const
 {
+       PolyItem::compute_bounding_box ();
+       if (_y1 > 0 && _bounding_box) {
+               _bounding_box.get().x0 = 0;
+               _bounding_box.get().x1 = COORD_MAX;
+               if (_y1 > _bounding_box.get().y1) {
+                       _bounding_box.get().y1 = _y1;
+               }
+       }
+}
 
+void
+PolyLine::set_fill_y1 (double y1) {
+       begin_change ();
+       _bounding_box_dirty = true;
+       _y1 = y1;
+       end_change ();
 }
 
 void
 PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
 {
+       if (_fill && _y1 > 0 && _points.size() > 0) {
+               const ArdourCanvas::Rect& vp (_canvas->visible_area());
+               setup_fill_context (context);
+
+               Duple y (0, _y1);
+               float y1 = item_to_window (y).y;
+               render_path (area, context);
+               Duple c0 (item_to_window (_points.back()));
+               Duple c1 (item_to_window (_points.front()));
+               if (c0.x < vp.x1) {
+                       context->line_to (vp.x1, c0.y);
+                       context->line_to (vp.x1, y1);
+               } else {
+                       context->line_to (vp.x1, y1);
+               }
+               if (c1.x > vp.x0) {
+                       context->line_to (vp.x0, y1);
+                       context->line_to (vp.x0, c1.y);
+               } else {
+                       context->line_to (vp.x0, y1);
+               }
+               context->close_path ();
+               context->fill ();
+       }
+
        if (_outline) {
                setup_outline_context (context);
                render_path (area, context);
                context->stroke ();
        }
 }
+
+void
+PolyLine::set_steps (Points const & points, bool stepped)
+{
+       if (!stepped) {
+               PolyItem::set(points);
+               return;
+       }
+
+       Points copy;
+       for (Points::const_iterator p = points.begin(); p != points.end();) {
+               Points::const_iterator next = p;
+               ++next;
+
+               copy.push_back(*p);
+               if (next != points.end() && next->x != p->x) {
+                       copy.push_back(Duple(next->x, p->y));
+               }
+
+               p = next;
+       }
+
+       PolyItem::set(copy);
+}
+
+bool
+PolyLine::covers (Duple const & point) const
+{
+       Duple p = window_to_item (point);
+
+       const Points::size_type npoints = _points.size();
+
+       if (npoints < 2) {
+               return false;
+       }
+
+       Points::size_type i;
+       Points::size_type j;
+
+       /* repeat for each line segment */
+
+       const Rect visible (window_to_item (_canvas->visible_area()));
+
+       for (i = 1, j = 0; i < npoints; ++i, ++j) {
+
+               Duple at;
+               double t;
+               Duple a (_points[j]);
+               Duple b (_points[i]);
+
+               /*
+                 Clamp the line endpoints to the visible area of the canvas. If we do
+                 not do this, we may have a line segment extending to COORD_MAX and our
+                 math goes wrong.
+               */
+
+               a.x = std::min (a.x, visible.x1);
+               a.y = std::min (a.y, visible.y1);
+               b.x = std::min (b.x, visible.x1);
+               b.y = std::min (b.y, visible.y1);
+
+               double d = distance_to_segment_squared (p, a, b, t, at);
+
+               if (t < 0.0 || t > 1.0) {
+                       continue;
+               }
+
+               if (d < _threshold + _outline_width) {
+                       return true;
+               }
+
+       }
+
+       return false;
+}
+
+void
+PolyLine::set_covers_threshold (double t)
+{
+       _threshold = t;
+}