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Clamp diagram zoom.

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- avoid poor performance and unusable UI when zooming out
This commit is contained in:
James Turner 2015-11-27 23:25:11 +00:00
parent 242e79f5e9
commit 6ee7e51af3
1 changed files with 8 additions and 2 deletions
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10
src/GUI/BaseDiagram.cxx
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@ -38,6 +38,8 @@
const float rec = 6378137; // earth radius, equator (?)
const float rpol = 6356752.314f; // earth radius, polar (?)
const double MINIMUM_SCALE = 0.002;
//Returns Earth radius at a given latitude (Ellipsoide equation with two equal axis)
static float earth_radius_lat( float lat )
{
@ -547,12 +549,16 @@ void BaseDiagram::wheelEvent(QWheelEvent *we)
m_wheelAngleDeltaAccumulator += delta;
if (m_wheelAngleDeltaAccumulator > 120) {
m_wheelAngleDeltaAccumulator = 0;
m_scale *= 2.0;
m_scale *= 1.5;
} else if (m_wheelAngleDeltaAccumulator < -120) {
m_wheelAngleDeltaAccumulator = 0;
m_scale *= 0.5;
m_scale *= 0.75;
}
SG_CLAMP_RANGE(m_scale, MINIMUM_SCALE, 1.0);
update();
}