1 files changed, 149 insertions, 0 deletions
diff --git a/libs/canvas/line.cc b/libs/canvas/line.cc
new file mode 100644
index 0000000000..af2a0e47db
--- /dev/null
+++ b/libs/canvas/line.cc
@@ -0,0 +1,149 @@
+/*
+    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 <cairomm/context.h>
+#include "pbd/compose.h"
+#include "canvas/line.h"
+#include "canvas/types.h"
+#include "canvas/debug.h"
+#include "canvas/utils.h"
+#include "canvas/canvas.h"
+
+using namespace std;
+using namespace ArdourCanvas;
+
+Line::Line (Group* parent)
+	: Item (parent)
+	, Outline (parent)
+{
+
+}
+
+void
+Line::compute_bounding_box () const
+{
+	Rect bbox;
+	
+	bbox.x0 = min (_points[0].x, _points[1].x);
+	bbox.y0 = min (_points[0].y, _points[1].y);
+	bbox.x1 = max (_points[0].x, _points[1].x);
+	bbox.y1 = max (_points[0].y, _points[1].y);
+
+	bbox = bbox.expand (0.5 + (_outline_width / 2));
+
+	_bounding_box = bbox;
+	_bounding_box_dirty = false;
+}
+
+void
+Line::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
+{
+	setup_outline_context (context);
+
+	Duple p0 = item_to_window (Duple (_points[0].x, _points[0].y));
+	Duple p1 = item_to_window (Duple (_points[1].x, _points[1].y));
+
+	/* See Cairo FAQ on single pixel lines to understand why we add 0.5
+	 */
+
+	context->move_to (p0.x + 0.5, p0.y + 0.5);
+	context->line_to (p1.x + 0.5, p1.y + 0.5);
+	context->stroke ();
+}
+
+void
+Line::set (Duple a, Duple b)
+{
+	begin_change ();
+
+	_points[0] = a;
+	_points[1] = b;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}
+
+void
+Line::set_x (Coord x0, Coord x1)
+{
+	begin_change ();
+	
+	_points[0].x = x0;
+	_points[1].x = x1;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}	
+
+void
+Line::set_x0 (Coord x0)
+{
+	begin_change ();
+	
+	_points[0].x = x0;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}
+
+void
+Line::set_y0 (Coord y0)
+{
+	begin_change ();
+
+	_points[0].y = y0;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}
+
+void
+Line::set_x1 (Coord x1)
+{
+	begin_change ();
+
+	_points[1].x = x1;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}
+
+void
+Line::set_y1 (Coord y1)
+{
+	begin_change ();
+
+	_points[1].y = y1;
+
+	_bounding_box_dirty = true;
+	end_change ();
+
+	DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+}