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, 2 insertions, 2 deletions

diff --git a/colormap.h b/colormap.h
index eda4492..1039cfd 100644
--- a/colormap.h
+++ b/colormap.h
@@ -31,11 +31,11 @@ public:
     Orientation orientation() const { return m_orientation; }
 
 signals:
-    void colorScaleChanged(const ColorScale &scale) const;
+    void colorScaleChanged(const ColorScale *scale) const;
     void orientationChanged(Orientation orientation) const;
 
 public slots:
-    void setColorScale(const ColorScale &scale);
+    void setColorScale(const ColorScale *scale);
 
 protected:
     QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *);