1 files changed, 46 insertions, 0 deletions
diff --git a/libtiled/maprenderer.cpp b/libtiled/maprenderer.cpp
new file mode 100644
index 0000000..719bd42
--- /dev/null
+++ b/libtiled/maprenderer.cpp
@@ -0,0 +1,46 @@
+/*
+ * maprenderer.cpp
+ * Copyright 2011, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
+ *
+ * This file is part of Tiled.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "maprenderer.h"
+
+#include <QVector2D>
+
+using namespace Tiled;
+
+/**
+ * Converts a line running from \a start to \a end to a polygon which
+ * extends 5 pixels from the line in all directions.
+ */
+QPolygonF MapRenderer::lineToPolygon(const QPointF &start, const QPointF &end)
+{
+    QPointF direction = QVector2D(end - start).normalized().toPointF();
+    QPointF perpendicular(-direction.y(), direction.x());
+
+    const qreal thickness = 5.0f; // 5 pixels on each side
+    direction *= thickness;
+    perpendicular *= thickness;
+
+    QPolygonF polygon(4);
+    polygon[0] = start + perpendicular - direction;
+    polygon[1] = start - perpendicular - direction;
+    polygon[2] = end - perpendicular + direction;
+    polygon[3] = end + perpendicular + direction;
+    return polygon;
+}