Textured surface example

Documentation once the feature set is final and code looking good. Size
of image files adjusted when example area is locked.

Change-Id: I7ff249ec3452d412a64ce029b33f7607965ffb3a
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/examples/datavisualization/texturesurface/topographicseries.cpp b/examples/datavisualization/texturesurface/topographicseries.cpp
new file mode 100644
index 00000000..1d94aead
--- /dev/null
+++ b/examples/datavisualization/texturesurface/topographicseries.cpp
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+#include "topographicseries.h"
+
+#include <QDebug>
+
+using namespace QtDataVisualization;
+
+// Value used to encode height data as RGB value on PNG file
+const float packingFactor = 11983.0f;
+
+TopographicSeries::TopographicSeries()
+{
+    setDrawMode(QSurface3DSeries::DrawSurface);
+    setFlatShadingEnabled(true);
+}
+
+TopographicSeries::~TopographicSeries()
+{
+}
+
+void TopographicSeries::setTopographyFile(const QString file, float width, float height)
+{
+    QImage heightMapImage(file);
+    uchar *bits = heightMapImage.bits();
+    int imageHeight = heightMapImage.height();
+    int imageWidth = heightMapImage.width();
+    int widthBits = imageWidth * 4;
+    float stepX = width / float(imageWidth);
+    float stepZ = height / float(imageHeight);
+
+    QSurfaceDataArray *dataArray = new QSurfaceDataArray;
+    dataArray->reserve(imageHeight);
+    for (int i = 0; i < imageHeight; i++) {
+        int p = (imageHeight - 1 - i) * widthBits;
+        QSurfaceDataRow *newRow = new QSurfaceDataRow(imageWidth);
+        for (int j = 0; j < imageWidth; j++) {
+            uchar aa = bits[p + 0];
+            uchar rr = bits[p + 1];
+            uchar gg = bits[p + 2];
+            uint color = uint((gg << 16) + (rr << 8) + aa);
+            float y = float(color) / packingFactor;
+            (*newRow)[j].setPosition(QVector3D(float(j) * stepX, y, float(i) * stepZ));
+            p = p + 4;
+        }
+        *dataArray << newRow;
+    }
+
+    m_sampleCountX = float(imageWidth);
+    m_sampleCountZ = float(imageHeight);
+
+    dataProxy()->resetArray(dataArray);
+}