1 files changed, 95 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/graph/gridnode.cpp b/examples/quick/scenegraph/graph/gridnode.cpp
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index 0000000000..2b5e8cac16
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+++ b/examples/quick/scenegraph/graph/gridnode.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "gridnode.h"
+
+#include "qmath.h"
+
+#define GRID_SIZE 32
+
+GridNode::GridNode()
+    : m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
+{
+    setGeometry(&m_geometry);
+    m_geometry.setDrawingMode(GL_LINES);
+
+    setMaterial(&m_material);
+    m_material.setColor(Qt::gray);
+}
+
+/*
+ * The function hardcodes a fixed set of grid lines and scales
+ * those to the bounding rect.
+ */
+void GridNode::setRect(const QRectF &rect)
+{
+    int vCount = int((rect.width() - 1) / GRID_SIZE);
+    int hCount = int((rect.height() - 1) / GRID_SIZE);
+
+    int lineCount = vCount + hCount;
+
+    QSGGeometry *g = geometry();
+
+    g->allocate(lineCount * 2);
+
+    float x = rect.x();
+    float y = rect.y();
+    float w = rect.width();
+    float h = rect.height();
+
+    QSGGeometry::Point2D *v = g->vertexDataAsPoint2D();
+
+    // Then write the vertical lines
+    for (int i=0; i<vCount; ++i)  {
+        float dx = (i + 1) * GRID_SIZE;
+        v[i*2].set(dx, y);
+        v[i*2+1].set(dx, y + h);
+    }
+    v += vCount * 2;
+    // Then write the horizontal lines
+    for (int i=0; i<hCount; ++i)  {
+        float dy = (i + 1) * GRID_SIZE;
+        v[i*2].set(x, dy);
+        v[i*2+1].set(x + w, dy);
+    }
+
+    // Tell the scenegraph we updated the geometry..
+    markDirty(QSGNode::DirtyGeometry);
+}