FGFS-4.1/OpenSceneGraph
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Introduced shearing of the image

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This commit is contained in:
Robert Osfield 2013-03-26 16:47:52 +00:00
parent a5cea75d47
commit b1c342c027
1 changed files with 29 additions and 7 deletions
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36
examples/osgkeystone/osgkeystone.cpp
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@ -66,6 +66,7 @@ class Keystone : public osg::Referenced
public:
Keystone():
translate(0.0,0.0),
shear(0.0,0.0),
scale(1.0,1.0),
taper(1.0,1.0),
angle(0.0)
@ -98,11 +99,28 @@ public:
cp.bottom_right -= translate;
cp.bottom_left -= translate;
osg::Vec2d mid_left = (cp.top_left+cp.bottom_left)*0.5;
osg::Vec2d mid_right = (cp.top_right+cp.bottom_right)*0.5;
osg::Vec2d mid_top = (cp.top_left+cp.top_right)*0.5;
osg::Vec2d mid_bottom = (cp.bottom_left+cp.bottom_right)*0.5;
shear.x() = (mid_top.x()-mid_bottom.x())/(mid_top.y()-mid_bottom.y());
shear.y() = (mid_right.y()-mid_left.y())/(mid_right.x()-mid_left.x());
cp.top_left.x() += cp.top_left.y() * shear.x();
cp.top_left.y() += cp.top_left.x() * shear.y();
cp.top_right.x() += cp.top_right.y() * shear.x();
cp.top_right.y() += cp.top_right.x() * shear.y();
cp.bottom_left.x() += cp.bottom_left.y() * shear.x();
cp.bottom_left.y() += cp.bottom_left.x() * shear.y();
cp.bottom_right.x() += cp.bottom_right.y() * shear.x();
cp.bottom_right.y() += cp.bottom_right.x() * shear.y();
#if 0
angle = (angleBetweenVectors(cp.top_left, osg::Vec2d(-1.0,1.0)) +
angleBetweenVectors(cp.top_right, osg::Vec2d(1.0,1.0)) +
angleBetweenVectors(cp.bottom_right, osg::Vec2d(1.0,-1.0)) +
angleBetweenVectors(cp.bottom_left, osg::Vec2d(-1.0,-1.0)))*0.25;
#endif
OSG_NOTICE<<"cp.top_left="<<cp.top_left<<std::endl;
OSG_NOTICE<<"cp.top_right="<<cp.top_right<<std::endl;
OSG_NOTICE<<"cp.bottom_right="<<cp.bottom_right<<std::endl;
@ -122,8 +140,8 @@ public:
// compute scaling
scale.x() = ( (cp.top_right.x()-cp.top_left.x()) + (cp.bottom_right.x()-cp.bottom_left.x()) )/4.0;
scale.y() = ( (cp.top_right.y()-cp.bottom_right.y()) + (cp.top_left.y()-cp.bottom_left.y()) )/4.0;
scale.x() = 1.0; // ( (cp.top_right.x()-cp.top_left.x()) + (cp.bottom_right.x()-cp.bottom_left.x()) )/4.0;
scale.y() = 1.0; //( (cp.top_right.y()-cp.bottom_right.y()) + (cp.top_left.y()-cp.bottom_left.y()) )/4.0;
// adjust control points to fit scaling
cp.top_left.x() *= scale.x();
@ -170,6 +188,7 @@ public:
}
osg::Vec2d translate;
osg::Vec2d shear;
osg::Vec2d scale;
osg::Vec2d taper;
double angle;
@ -491,13 +510,16 @@ struct KeystoneUpdateCallback : public osg::Drawable::UpdateCallback
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, screenHeight*sy*0.5 + ty*screenHeight*0.5 ,-screenDistance*r_left) * pm;
(*vertices)[1] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right, screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_right) * pm;
(*vertices)[2] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right,-screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_right) * pm;
(*vertices)[3] = osg::Vec3(-screenWidth*sx*0.5*r_left + tx*screenWidth*0.5*r_left,-screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_left) * pm;
(*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;
geometry->dirtyBound();
}