# Visualization Library

A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlGraphics/ClipPlane.cpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.com                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2010, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #include <vlGraphics/ClipPlane.hpp>
    00033
    00034 using namespace vl;
    00035
    00036 //-----------------------------------------------------------------------------
    00037 ClipPlane::ClipPlane(int plane_index, Real o, vec3 n)
    00038 {
    00039   VL_DEBUG_SET_OBJECT_NAME()
    00040   mPlaneIndex = plane_index;
    00041   mPlane.setNormal(n);
    00042   mPlane.setOrigin(o);
    00043 }
    00044 //-----------------------------------------------------------------------------
    00045 ClipPlane::ClipPlane(int plane_index, const vec3& o, const vec3& n)
    00046 {
    00047   VL_DEBUG_SET_OBJECT_NAME()
    00048   mPlaneIndex = plane_index;
    00049   mPlane.setNormal(n);
    00050   mPlane.setOrigin(dot(o, n));
    00051 }
    00052 //-----------------------------------------------------------------------------
    00053 void ClipPlane::apply(const Camera* camera, OpenGLContext*) const
    00054 {
    00055   VL_CHECK(planeIndex()>=0 && planeIndex()<6);
    00056
    00057   // we do our own transformations
    00058
    00059   if (camera)
    00060   {
    00061     glEnable(GL_CLIP_PLANE0 + planeIndex());
    00062
    00063     glMatrixMode(GL_MODELVIEW);
    00064     glPushMatrix();
    00065
    00066     glLoadIdentity();
    00067
    00068     mat4 mat;
    00069     if ( followedTransform() )
    00070       mat = camera->viewMatrix() * followedTransform()->worldMatrix();
    00071
    00072     vec3 pt1 = mPlane.normal() * mPlane.origin();
    00073     vec3 pt2 = mPlane.normal() * mPlane.origin() + mPlane.normal();
    00074
    00075     pt1 = mat * pt1;
    00076     pt2 = mat * pt2;
    00077
    00078     vec3 n = pt2 - pt1;
    00079     Real orig = dot(n, pt1);
    00080
    00081     double equation[] =
    00082     {
    00083       (double)n.x(),
    00084       (double)n.y(),
    00085       (double)n.z(),
    00086       -(double)orig
    00087     };
    00088
    00089     glClipPlane(GL_CLIP_PLANE0 + planeIndex(), equation);
    00090
    00091     glPopMatrix();
    00092   }
    00093   else
    00094   {
    00095     glDisable(GL_CLIP_PLANE0 + planeIndex());
    00096   }
    00097 }
    00098 //-----------------------------------------------------------------------------

Visualization Library v2011.05.1142 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu May 26 2011 22:51:23.
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