initial implementation of a more specialized canvas item for (sustained) notes

libs/canvas/canvas/note.h

@@ -0,0 +1,44 @@
+/*
+    Copyright (C) 2018 Paul Davis
+
+    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.
+*/
+
+#ifndef __CANVAS_NOTE_H__
+#define __CANVAS_NOTE_H__
+
+#include "canvas/visibility.h"
+#include "canvas/rectangle.h"
+
+namespace ArdourCanvas
+{
+
+class LIBCANVAS_API Note : public Rectangle
+{
+public:
+	Note (Canvas*);
+	Note (Item*);
+
+	void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
+	void set_velocity (double fract);
+
+  private:
+	static bool _show_velocity_bars;
+	double _velocity;
+};
+
+}
+
+#endif /* __CANVAS_NOTE_H__ */