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# Rendering/vtkgluPickMatrix.h

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    00001 /*=========================================================================
    00002
    00003   Program:   Visualization Toolkit
    00004   Module:    $RCSfile: vtkgluPickMatrix.h,v $
    00005   Language:  C++
    00006
    00007   Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen
    00008   All rights reserved.
    00009   See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
    00010
    00011      This software is distributed WITHOUT ANY WARRANTY; without even
    00012      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
    00013      PURPOSE.  See the above copyright notice for more information.
    00014
    00015 =========================================================================*/
    00026 #ifndef vtkgluPickMatrix_h
    00027 #define vtkgluPickMatrix_h
    00028
    00029 #ifndef VTK_IMPLEMENT_MESA_CXX
    00030 # if defined(__APPLE__) && (defined(VTK_USE_CARBON) || defined(VTK_USE_COCOA))
    00031 #  include <OpenGL/gl.h>
    00032 # else
    00033 #  include <GL/gl.h>
    00034 # endif
    00035 #endif
    00036
    00037 // This function was copied from Mesa and sets up the pick matrix
    00038 inline void vtkgluPickMatrix( GLdouble x, GLdouble y,
    00039                               GLdouble width, GLdouble height,
    00040                               int *origin, int *size )
    00041 {
    00042   GLfloat m[16];
    00043   GLfloat sx, sy;
    00044   GLfloat tx, ty;
    00045
    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;
    00050
    00051 #define M(row,col)  m[col*4+row]
    00052    M(0,0) = sx;   M(0,1) = 0.0;  M(0,2) = 0.0;  M(0,3) = tx;
    00053    M(1,0) = 0.0;  M(1,1) = sy;   M(1,2) = 0.0;  M(1,3) = ty;
    00054    M(2,0) = 0.0;  M(2,1) = 0.0;  M(2,2) = 1.0;  M(2,3) = 0.0;
    00055    M(3,0) = 0.0;  M(3,1) = 0.0;  M(3,2) = 0.0;  M(3,3) = 1.0;
    00056 #undef M
    00057
    00058    glMultMatrixf( m );
    00059 }
    00060
    00061 #endif