Added the Colormap component.

* The Colormap component is a simple rect with a texture mapped
  that displays a ColorScale with a fixed number of samples. This
  number of samples is exported as a member const, which is used
  on other components (such as VoronoiSplat).
* The texture mapping is reflecting the colormap lookup used in
  VoronoiSplat.
* The ColorScale class now has a method for sampling the color
  scale and outputs the samples to iterator-style objects,
  providing easy intergration with existing code.

1 files changed, 40 insertions, 0 deletions

diff --git a/colormap.h b/colormap.h
new file mode 100644
index 0000000..806624a
--- /dev/null
+++ b/colormap.h
@@ -0,0 +1,40 @@
+#ifndef COLORMAP_H
+#define COLORMAP_H
+
+#include <vector>
+
+#include <QtQuick>
+#include <QSGDynamicTexture>
+
+#include <armadillo>
+
+#include "colorscale.h"
+
+class Colormap
+    : public QQuickItem
+{
+    Q_OBJECT
+public:
+    static const int SAMPLES = 128;
+
+    Colormap(QQuickItem *parent = 0);
+    ~Colormap();
+
+signals:
+    void colorScaleChanged(const ColorScale &scale) const;
+
+public slots:
+    void setColorScale(const ColorScale &scale);
+
+protected:
+    QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *);
+
+private:
+    QSGNode *newSceneGraph();
+
+    QSGDynamicTexture *m_texture;
+    bool m_shouldUpdateTexture;
+    std::vector<float> m_cmap;
+};
+
+#endif // COLORMAP_H