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 /*
 * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
 #ifndef B2_TIME_OF_IMPACT_H
 #define B2_TIME_OF_IMPACT_H
 
 #include <Box2D/Common/b2Math.h>
 #include <Box2D/Collision/b2Distance.h>
 
 /// Input parameters for b2TimeOfImpact
 struct b2TOIInput
 {
     b2DistanceProxy proxyA;
     b2DistanceProxy proxyB;
     b2Sweep sweepA;
     b2Sweep sweepB;
     float32 tMax;       // defines sweep interval [0, tMax]
 };
 
 // Output parameters for b2TimeOfImpact.
 struct b2TOIOutput
 {
     enum State
     {
         e_unknown,
         e_failed,
         e_overlapped,
         e_touching,
         e_separated
     };
 
     State state;
     float32 t;
 };
 
 /// Compute the upper bound on time before two shapes penetrate. Time is represented as
 /// a fraction between [0,tMax]. This uses a swept separating axis and may miss some intermediate,
 /// non-tunneling collision. If you change the time interval, you should call this function
 /// again.
 /// Note: use b2Distance to compute the contact point and normal at the time of impact.
 void b2TimeOfImpact(b2TOIOutput* output, const b2TOIInput* input);
 
 #endif