# 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/EdgeUpdateCallback.hpp

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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 #ifndef EdgeUpdateCallback_INCLUDE_ONCE
    00033 #define EdgeUpdateCallback_INCLUDE_ONCE
    00034
    00035 #include <vlGraphics/Actor.hpp>
    00036 #include <vlGraphics/EdgeExtractor.hpp>
    00037 #include <vlGraphics/Geometry.hpp>
    00038 #include <vlGraphics/Camera.hpp>
    00039
    00040 namespace vl
    00041 {
    00044   class EdgeUpdateCallback: public ActorEventCallback
    00045   {
    00046   public:
    00047     virtual const char* className() { return "vl::EdgeUpdateCallback"; }
    00048     EdgeUpdateCallback(): mShowCreases(true)
    00049     {
    00050       VL_DEBUG_SET_OBJECT_NAME()
    00051     }
    00052     EdgeUpdateCallback(const std::vector<EdgeExtractor::Edge>& edge): mEdges(edge), mShowCreases(false)
    00053     {
    00054       VL_DEBUG_SET_OBJECT_NAME()
    00055     }
    00056
    00058     void setShowCreases(bool sonly) { mShowCreases = sonly; }
    00060     bool showCreases() const { return mShowCreases; }
    00061
    00062     virtual void onActorDelete(Actor*) {}
    00063
    00064     virtual void onActorRenderStarted(Actor* act, Real /*frame_clock*/, const Camera* cam, Renderable* renderable, const Shader*, int pass)
    00065     {
    00066       if (pass != 0)
    00067         return;
    00068
    00069       fmat4 vmat = (fmat4)cam->viewMatrix();
    00070       if (act->transform())
    00071         vmat = vmat * (fmat4)act->transform()->worldMatrix();
    00072       fmat4 nmat = vmat.as3x3();
    00073       nmat = nmat.getInverse().transpose();
    00074
    00075       ref<Geometry>         geom = dynamic_cast<Geometry*>(renderable);
    00076       ref<ArrayFloat3> vert_array = dynamic_cast<ArrayFloat3*>(geom->vertexArray());
    00077       // VL_CHECK(vert_array->size() == edges().size()*2);
    00078       for(unsigned i=0; i<edges().size(); ++i)
    00079       {
    00080         bool insert_edge = edges()[i].isCrease() && showCreases();
    00081         if (!insert_edge)
    00082         {
    00083           fvec3 v1 = vmat * edges()[i].vertex1();
    00084           fvec3 v2 = vmat * edges()[i].vertex2();
    00085           fvec3 v  = ((v1+v2) * 0.5f).normalize();
    00086           fvec3 n1 = nmat * edges()[i].normal1();
    00087           fvec3 n2 = nmat * edges()[i].normal2();
    00088           insert_edge = dot(n1, v) * dot(n2, v) < 0;
    00089         }
    00090         if ( insert_edge )
    00091         {
    00092           vert_array->at(i*2+0) = edges()[i].vertex1();
    00093           vert_array->at(i*2+1) = edges()[i].vertex2();
    00094         }
    00095         else
    00096         {
    00097           // degenerate
    00098           vert_array->at(i*2+0) = vert_array->at(i*2+1);
    00099         }
    00100       }
    00101     }
    00102
    00103     const std::vector<EdgeExtractor::Edge>& edges() const { return mEdges; }
    00104     std::vector<EdgeExtractor::Edge>& edges() { return mEdges; }
    00105
    00106   private:
    00107     std::vector<EdgeExtractor::Edge> mEdges;
    00108     bool mShowCreases;
    00109   };
    00110
    00111 }
    00112
    00113 #endif

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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