dox/Rendering/vtkgluPickMatrix.h
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#ifndef vtkgluPickMatrix_h
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#define vtkgluPickMatrix_h
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#ifndef VTK_IMPLEMENT_MESA_CXX
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# if defined(__APPLE__) && (defined(VTK_USE_CARBON) || defined(VTK_USE_COCOA))
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# include <OpenGL/gl.h>
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# else
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# include <GL/gl.h>
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# endif
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#endif
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00038 inline void vtkgluPickMatrix( GLdouble x, GLdouble y,
00039 GLdouble width, GLdouble height,
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int *origin,
int *size )
00041 {
00042 GLfloat m[16];
00043 GLfloat sx, sy;
00044 GLfloat tx, ty;
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00046 sx = size[0] / width;
00047 sy = size[1] / height;
00048 tx = (size[0] + 2.0 * (origin[0] - x)) / width;
00049 ty = (size[1] + 2.0 * (origin[1] - y)) / height;
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#define M(row,col) m[col*4+row]
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M(0,0) = sx;
M(0,1) = 0.0;
M(0,2) = 0.0;
M(0,3) = tx;
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M(1,0) = 0.0;
M(1,1) = sy;
M(1,2) = 0.0;
M(1,3) = ty;
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M(2,0) = 0.0;
M(2,1) = 0.0;
M(2,2) = 1.0;
M(2,3) = 0.0;
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M(3,0) = 0.0;
M(3,1) = 0.0;
M(3,2) = 0.0;
M(3,3) = 1.0;
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#undef M
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00058 glMultMatrixf( m );
00059 }
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#endif