59 lines
		
	
	
		
			1.8 KiB
		
	
	
	
		
			C
		
	
	
	
		
		
			
		
	
	
			59 lines
		
	
	
		
			1.8 KiB
		
	
	
	
		
			C
		
	
	
	
|  | /*
 | ||
|  | * 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 collisions. 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
 |