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diff --git a/src/gui/editors/matrix/QCanvasMatrixDiamond.cpp b/src/gui/editors/matrix/QCanvasMatrixDiamond.cpp
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+++ b/src/gui/editors/matrix/QCanvasMatrixDiamond.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+
+#include "QCanvasMatrixDiamond.h"
+
+#include "MatrixElement.h"
+#include "QCanvasMatrixRectangle.h"
+#include <qcanvas.h>
+#include <qpainter.h>
+#include <qpointarray.h>
+#include <qpoint.h>
+
+
+namespace Rosegarden
+{
+
+QCanvasMatrixDiamond::QCanvasMatrixDiamond(MatrixElement &n,
+        QCanvas* canvas) :
+        QCanvasMatrixRectangle(n, canvas)
+{}
+
+QCanvasMatrixDiamond::~QCanvasMatrixDiamond()
+{
+    hide();
+}
+
+QPointArray QCanvasMatrixDiamond::areaPoints() const
+{
+    QPointArray pa(4);
+    int pw = (pen().width() + 1) / 2;
+    if ( pw < 1 )
+        pw = 1;
+    if ( pen() == NoPen )
+        pw = 0;
+    pa[0] = QPoint((int)x() - height() / 2 - pw, (int)y() - pw);
+    pa[1] = pa[0] + QPoint(height() + pw * 2, 0);
+    pa[2] = pa[1] + QPoint(0, height() + pw * 2);
+    pa[3] = pa[0] + QPoint(0, height() + pw * 2);
+    return pa;
+}
+
+void QCanvasMatrixDiamond::drawShape(QPainter & p)
+{
+    p.save();
+    p.setWorldXForm(false);
+
+    QPointArray pa(4);
+    int q = height() / 2 + 2;
+    QPoint mapPos = p.worldMatrix().map(QPoint(int(x()), int(y())));
+
+    pa[0] = QPoint(mapPos.x(), mapPos.y() - 3);
+    pa[1] = QPoint(mapPos.x() + q, mapPos.y() - 3 + q);
+    pa[2] = pa[0] + QPoint(0, q * 2);
+    pa[3] = pa[1] - QPoint(q * 2, 0);
+    p.drawConvexPolygon(pa);
+
+    p.restore();
+}
+
+}