FGFS-4.1/OpenSceneGraph
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Moved the keystone geometry computation into a Keystone::compute3DPositions(..) method

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This commit is contained in:
Robert Osfield
2013-04-11 16:07:49 +00:00
parent 830d21471b
commit 7ff4be954b
1 changed files with 21 additions and 44 deletions
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65
examples/osgkeystone/osgkeystone.cpp
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@@ -59,6 +59,26 @@ public:
osg::Vec2d bottom_right;
osg::Vec2d top_left;
osg::Vec2d top_right;
void compute3DPositions(osg::DisplaySettings* ds, osg::Vec3& tl, osg::Vec3& tr, osg::Vec3& br, osg::Vec3& bl) const
{
double tr_x = ((top_right-bottom_right).length()) / ((top_left-bottom_left).length());
double r_left = sqrt(tr_x);
double r_right = r_left/tr_x;
double tr_y = ((top_right-top_left).length()) / ((bottom_right-bottom_left).length());
double r_bottom = sqrt(tr_y);
double r_top = r_bottom/tr_y;
double screenDistance = ds->getScreenDistance();
double screenWidth = ds->getScreenWidth();
double screenHeight = ds->getScreenHeight();
tl = osg::Vec3(screenWidth*0.5*top_left.x(), screenHeight*0.5*top_left.y(), -screenDistance)*r_left*r_top;
tr = osg::Vec3(screenWidth*0.5*top_right.x(), screenHeight*0.5*top_right.y(), -screenDistance)*r_right*r_top;
br = osg::Vec3(screenWidth*0.5*bottom_right.x(), screenHeight*0.5*bottom_right.y(), -screenDistance)*r_right*r_bottom;
bl = osg::Vec3(screenWidth*0.5*bottom_left.x(), screenHeight*0.5*bottom_left.y(), -screenDistance)*r_left*r_bottom;
}
};
@@ -380,50 +400,7 @@ struct KeystoneUpdateCallback : public osg::Drawable::UpdateCallback
osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
if (!vertices) return;
#if 1
double tr_x = ((_keystone->top_right-_keystone->bottom_right).length()) / ((_keystone->top_left-_keystone->bottom_left).length());
double r_left = sqrt(tr_x);
double r_right = r_left/tr_x;
double tr_y = ((_keystone->top_right-_keystone->top_left).length()) / ((_keystone->bottom_right-_keystone->bottom_left).length());
double r_bottom = sqrt(tr_y);
double r_top = r_bottom/tr_y;
double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
(*vertices)[0] = osg::Vec3(screenWidth*0.5*_keystone->top_left.x(), screenHeight*0.5*_keystone->top_left.y(), -screenDistance)*r_left*r_top;
(*vertices)[1] = osg::Vec3(screenWidth*0.5*_keystone->top_right.x(), screenHeight*0.5*_keystone->top_right.y(), -screenDistance)*r_right*r_top;
(*vertices)[2] = osg::Vec3(screenWidth*0.5*_keystone->bottom_right.x(), screenHeight*0.5*_keystone->bottom_right.y(), -screenDistance)*r_right*r_bottom;
(*vertices)[3] = osg::Vec3(screenWidth*0.5*_keystone->bottom_left.x(), screenHeight*0.5*_keystone->bottom_left.y(), -screenDistance)*r_left*r_bottom;
#else
double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
double tr = _keystone->taper.x();
double r_right = sqrt(tr);
double r_left = r_right/tr;
double sx = _keystone->scale.x();
double sy = _keystone->scale.y();
double tx = _keystone->translate.x();
double ty = _keystone->translate.y();
double shx = _keystone->shear.x();
double shy = _keystone->shear.y();
osg::Matrixd pm;
pm.postMultRotate(osg::Quat(_keystone->angle, osg::Vec3d(0.0,0.0,1.0)));
(*vertices)[0] = osg::Vec3(-screenWidth*sx*0.5*r_left + tx*screenWidth*0.5*r_left + shx*screenHeight, screenHeight*sy*0.5 + ty*screenHeight*0.5 - shy*screenWidth*0.5, -screenDistance*r_left) * pm;
(*vertices)[1] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right + shx*screenHeight, screenHeight*sy*0.5 + ty*screenHeight*0.5 + shy*screenWidth*0.5, -screenDistance*r_right) * pm;
(*vertices)[2] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right - shx*screenHeight,-screenHeight*sy*0.5 + ty*screenHeight*0.5 + shy*screenWidth*0.5, -screenDistance*r_right) * pm;
(*vertices)[3] = osg::Vec3(-screenWidth*sx*0.5*r_left + tx*screenWidth*0.5*r_left - shx*screenHeight,-screenHeight*sy*0.5 + ty*screenHeight*0.5 - shy*screenWidth*0.5, -screenDistance*r_left) * pm;
#endif
_keystone->compute3DPositions(osg::DisplaySettings::instance().get(), (*vertices)[0], (*vertices)[1], (*vertices)[2], (*vertices)[3]);
geometry->dirtyBound();
}