Improvements related to ColorScale and screenshots.

* ColorScale: now a pointer whenever needed. main() takes care of
  updating extents
* New class DivergentColorScale: works specifically for divergent
  scales, always has 3 colors as input: negative values, 0, positive
  values
* ManipulationHandler: ProjectionHistory no longer needed

1 files changed, 3 insertions, 3 deletions

diff --git a/colormap.cpp b/colormap.cpp
index 3ebf5c8..961f475 100644
--- a/colormap.cpp
+++ b/colormap.cpp
@@ -129,10 +129,10 @@ void Colormap::setOrientation(Colormap::Orientation orientation)
     update();
 }
 
-void Colormap::setColorScale(const ColorScale &scale)
+void Colormap::setColorScale(const ColorScale *scale)
 {
-    m_cmap.resize(scale.numColors() * 3);
-    scale.sample(scale.numColors(), m_cmap.data());
+    m_cmap.resize(SAMPLES * 3);
+    scale->sample(SAMPLES, m_cmap.data());
     if (m_orientation == Colormap::Vertical) {
         reverseCMap(m_cmap);
     }