FGFS-4.1/OpenSceneGraph
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From Vivek Rajan, "osg::Text was getting stretched when the CharacterSizeMode was set to

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SCREEN_COORDS and the SceneView's projection matrix was set to an
Ortho2D matrix (sceneView->setProjectionMatrixAsOrtho2D(-1,1,-1,1)).

Computing the pixel size separately vertically and horizontally, and
setting the scaling factors appropriately based on that fixed the
problem."
This commit is contained in:
Robert Osfield
2005-04-26 07:49:18 +00:00
parent edf142222b
commit 38bf740ef4
1 changed files with 15 additions and 9 deletions
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24
src/osgText/Text.cpp
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@@ -758,21 +758,27 @@ void Text::computePositions(unsigned int contextID) const
float pixelSizeVector_w = M(3,2)*P23 + M(3,3)*P33;
float pixelSize = (_characterHeight*sqrtf(scale_00.length2()+scale_10.length2()))/(pixelSizeVector_w*0.701f);
float pixelSizeVert=(_characterHeight*sqrtf(scale_10.length2()))/(pixelSizeVector_w*0.701f);
float pixelSizeHori=(_characterHeight/_characterAspectRatio*sqrtf(scale_00.length2()))/(pixelSizeVector_w*0.701f);
// avoid nasty math by preventing a divide by zero
if(pixelSize == 0.0f)
{
pixelSize = 1.0f;
}
if (pixelSizeVert == 0.0f)
pixelSizeVert= 1.0f;
if (pixelSizeHori == 0.0f)
pixelSizeHori= 1.0f;
if (_characterSizeMode==SCREEN_COORDS)
{
float scale_font = _characterHeight/pixelSize;
matrix.postMult(osg::Matrix::scale(scale_font, scale_font,1.0f));
float scale_font_vert=_characterHeight/pixelSizeVert;
float scale_font_hori=_characterHeight/_characterAspectRatio/pixelSizeHori;
if (P10<0)
scale_font_vert=-scale_font_vert;
matrix.postMult(osg::Matrix::scale(scale_font_hori, scale_font_vert,1.0f));
}
else if (pixelSize>_fontHeight)
else if (pixelSizeVert>_fontHeight)
{
float scale_font = _fontHeight/pixelSize;
float scale_font = _fontHeight/pixelSizeVert;
matrix.postMult(osg::Matrix::scale(scale_font, scale_font,1.0f));
}