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, 1 insertions, 1 deletions

diff --git a/colorscale.cpp b/colorscale.cpp
index 06852d4..f41e7d9 100644
--- a/colorscale.cpp
+++ b/colorscale.cpp
@@ -32,7 +32,7 @@ void ColorScale::setExtents(float min, float max)
     m_max = max;
 }
 
-static QColor lerp(const QColor &c1, const QColor &c2, float _t)
+QColor ColorScale::lerp(const QColor &c1, const QColor &c2, float _t)
 {
     qreal r1, g1, b1, a1;
     qreal r2, g2, b2, a2;