1 files changed, 104 insertions, 0 deletions
diff --git a/libs/canvas/line_set.cc b/libs/canvas/line_set.cc
new file mode 100644
index 0000000000..5aefe1bf47
--- /dev/null
+++ b/libs/canvas/line_set.cc
@@ -0,0 +1,104 @@
+/*
+    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 "canvas/line_set.h"
+#include "canvas/utils.h"
+
+using namespace std;
+using namespace ArdourCanvas;
+
+/* XXX: hard-wired to horizontal only */
+
+class LineSorter {
+public:
+	bool operator() (LineSet::Line& a, LineSet::Line& b) {
+		return a.y < b.y;
+	}
+};
+
+LineSet::LineSet (Group* parent)
+	: Item (parent)
+	, _height (0)
+{
+
+}
+
+
+void
+LineSet::compute_bounding_box () const
+{
+	if (_lines.empty ()) {
+		_bounding_box = boost::optional<Rect> ();
+		_bounding_box_dirty = false;
+		return;
+	}
+	
+	_bounding_box = Rect (0, _lines.front().y, COORD_MAX, min (_height, _lines.back().y));
+	_bounding_box_dirty = false;
+}
+
+void
+LineSet::set_height (Distance height)
+{
+	begin_change ();
+
+	_height = height;
+
+	_bounding_box_dirty = true;
+	end_change ();
+}
+
+void
+LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
+{
+	for (list<Line>::const_iterator i = _lines.begin(); i != _lines.end(); ++i) {
+		if (i->y > area.y1) {
+			break;
+		} else if (i->y > area.y0) {
+			set_source_rgba (context, i->color);
+			context->set_line_width (i->width);
+			Duple p0 = item_to_window (Duple (area.x0, i->y));
+			Duple p1 = item_to_window (Duple (area.x1, i->y));
+			context->move_to (p0.x, p0.y);
+			context->line_to (p1.x, p1.y);
+			context->stroke ();
+		}
+	}
+}
+
+void
+LineSet::add (Coord y, Distance width, Color color)
+{
+	begin_change ();
+	
+	_lines.push_back (Line (y, width, color));
+	_lines.sort (LineSorter ());
+
+	_bounding_box_dirty = true;
+	end_change ();
+}
+
+void
+LineSet::clear ()
+{
+	begin_change ();
+	_lines.clear ();
+	_bounding_box_dirty = true;
+	end_change ();
+}