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
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;
+}