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# Box2D/Box2D/Collision/b2TimeOfImpact.h

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    00001 /*
    00002 * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
    00003 *
    00004 * This software is provided 'as-is', without any express or implied
    00005 * warranty.  In no event will the authors be held liable for any damages
    00006 * arising from the use of this software.
    00007 * Permission is granted to anyone to use this software for any purpose,
    00008 * including commercial applications, and to alter it and redistribute it
    00009 * freely, subject to the following restrictions:
    00010 * 1. The origin of this software must not be misrepresented; you must not
    00011 * claim that you wrote the original software. If you use this software
    00012 * in a product, an acknowledgment in the product documentation would be
    00013 * appreciated but is not required.
    00014 * 2. Altered source versions must be plainly marked as such, and must not be
    00015 * misrepresented as being the original software.
    00016 * 3. This notice may not be removed or altered from any source distribution.
    00017 */
    00018
    00019 #ifndef B2_TIME_OF_IMPACT_H
    00020 #define B2_TIME_OF_IMPACT_H
    00021
    00022 #include <Box2D/Common/b2Math.h>
    00023 #include <Box2D/Collision/b2Distance.h>
    00024 #include <climits>
    00025
    00027 struct b2TOIInput
    00028 {
    00029         b2DistanceProxy proxyA;
    00030         b2DistanceProxy proxyB;
    00031         b2Sweep sweepA;
    00032         b2Sweep sweepB;
    00033         float32 tMax;           // defines sweep interval [0, tMax]
    00034 };
    00035
    00036 // Output parameters for b2TimeOfImpact.
    00037 struct b2TOIOutput
    00038 {
    00039         enum State
    00040         {
    00041                 e_unknown,
    00042                 e_failed,
    00043                 e_overlapped,
    00044                 e_touching,
    00045                 e_separated
    00046         };
    00047
    00048         State state;
    00049         float32 t;
    00050 };
    00051
    00057 void b2TimeOfImpact(b2TOIOutput* output, const b2TOIInput* input);
    00058
    00059 #endif