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, 23 insertions, 0 deletions

diff --git a/colorscale.h b/colorscale.h
index af74b5c..90671eb 100644
--- a/colorscale.h
+++ b/colorscale.h
@@ -20,9 +20,32 @@ public:
     float min() const { return m_min; }
     float max() const { return m_max; }
 
+    template<typename OutputIterator>
+    void sample(int samples, OutputIterator it) const;
+
 protected:
     float m_min, m_max;
     QList<QColor> m_colors;
 };
 
+template<typename OutputIterator>
+void ColorScale::sample(int samples, OutputIterator it) const
+{
+    if (samples < 1) {
+        return;
+    }
+
+    float t = min();
+    float step = (max() - min()) / samples;
+    qreal r, g, b;
+    for (unsigned i = 0; i < 3*samples; i += 3) {
+        color(t).getRgbF(&r, &g, &b);
+        *it = r; it++;
+        *it = g; it++;
+        *it = b; it++;
+
+        t += step;
+    }
+}
+
 #endif // COLORSCALE_H