X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fcanvas%2Fpoly_line.cc;h=c0e233b38f69ac06cc6f43890d5713c65dc470a8;hb=c8c6bca6587450ff64303dbc994a4cd28d6ce7aa;hp=bdc4af9c103e5df63863d943156f010f4cf1afbb;hpb=fa71d82dda08558caf4a9c5102016f2746883d10;p=ardour.git

diff --git a/libs/canvas/poly_line.cc b/libs/canvas/poly_line.cc
index bdc4af9c10..c0e233b38f 100644
--- 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;
+}