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fixes #0002921, fixes #0002922

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wmayer
2017-02-24 19:54:16 +01:00
parent 74f7d9fd65
commit 05cdc342ef
1 changed files with 9 additions and 3 deletions
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12
src/Mod/Sketcher/Gui/SoDatumLabel.cpp
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@@ -429,12 +429,18 @@ void SoDatumLabel::GLRender(SoGLRenderAction * action)
* The scale calculation is based on knowledge of SbViewVolume::getWorldToScreenScale
* implementation internals. The factor returned from this function is calculated from the view frustums
* nearplane width, height is not taken into account, and hence we divide it with the viewport width
* to get the exact pixel scale faktor.
* to get the exact pixel scale factor.
* This is not documented and therefore may change on later coin versions!
*/
const SbViewVolume & vv = SoViewVolumeElement::get(state);
float scale = vv.getWorldToScreenScale(SbVec3f(0.f,0.f,0.f), 1.f);
SbVec2s vp_size = action->getViewportRegion().getViewportSizePixels();
// As reference use the center point the camera is looking at on the near plane
// because then independent of the camera we get a constant scale factor when panning.
// If we used (0,0,0) instead then the scale factor would change heavily in perspective
// rendering mode. See #0002921 and #0002922.
SbVec3f center = vv.getSightPoint(vv.getNearDist());
float scale = vv.getWorldToScreenScale(center, 1.f);
const SbViewportRegion & vp = SoViewportRegionElement::get(state);
SbVec2s vp_size = vp.getViewportSizePixels();
scale /= float(vp_size[0]);
const SbString* s = string.getValues(0);