remove invalid assertion - #6634

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

diff --git a/libs/canvas/poly_line.cc b/libs/canvas/poly_line.cc
index e48082817dfc2187cc6d8ca438ab036d27dd9331..5d6abb9814923bab832b47d3595087d70404c192 100644 (file)
--- a/libs/canvas/poly_line.cc
+++ b/libs/canvas/poly_line.cc
@@ -1,13 +1,40 @@
-#include "pbd/xml++.h"
+/*
+    Copyright (C) 2011-2013 Paul Davis
+    Author: Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    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)
 {
+}
 
+PolyLine::PolyLine (Item* parent)
+       : PolyItem (parent)
+       , _threshold (1.0)
+{
 }
 
 void
@@ -20,19 +47,83 @@ PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
        }
 }
 
+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);
+}
 
-XMLNode *
-PolyLine::get_state () const
+bool
+PolyLine::covers (Duple const & point) const
 {
-       XMLNode* node = new XMLNode ("PolyLine");
-       add_poly_item_state (node);
-       add_outline_state (node);
-       return node;
+       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_state (XMLNode const * node)
+PolyLine::set_covers_threshold (double t)
 {
-       set_poly_item_state (node);
-       set_outline_state (node);
+       _threshold = t;
 }