87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
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// BoundingObjects.h
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//
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// Last modified: 26 May 04, Mark Thompson mot20@cam.ac.uk / mark@wildfiregames.com
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//
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// Bounding circle and object-aligned bounding box. 2D, for simulation code.
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//
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// Note: object-aligned bounding boxes are often referred to as oriented bounding boxes (OBBs)
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// At present, this stuff compiles; no guarantee is made of it actually working yet, however.
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#ifndef BOUNDING_OBJECTS_INCLUDED
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#define BOUNDING_OBJECTS_INCLUDED
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#include "Prometheus.h"
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class CVector2D
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{
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public:
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float x;
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float y;
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CVector2D() {}
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CVector2D( float _x, float _y )
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{
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x = _x; y = _y;
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}
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static inline float dot( CVector2D& u, CVector2D& v )
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{
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return( u.x * v.x + u.y * v.y );
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}
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inline float dot( CVector2D& u )
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{
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return( dot( *this, u ) );
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}
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inline CVector2D operator-( CVector2D& u )
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{
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return( CVector2D( x - u.x, y - u.y ) );
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}
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inline bool within( float dist )
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{
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return( ( x * x + y * y ) <= ( dist * dist ) );
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}
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};
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class CBoundingBox;
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class CBoundingCircle;
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class CBoundingObject
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{
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public:
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CBoundingObject() {}
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enum CBoundingType
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{
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BOUND_CIRCLE,
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BOUND_OABB
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};
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CBoundingType type;
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CVector2D pos;
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float trivialRejectionRadius;
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bool intersects( CBoundingObject* obj );
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virtual bool _intersects( CBoundingObject* obj, CVector2D* delta ) = 0;
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};
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class CBoundingCircle : public CBoundingObject
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{
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public:
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float r;
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CBoundingCircle( float _x, float _y, float _radius );
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void setPosition( float _x, float _y );
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void setRadius( float _radius );
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bool _intersects( CBoundingObject* obj, CVector2D* delta );
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};
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class CBoundingBox : public CBoundingObject
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{
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public:
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CVector2D u; // Unit vector along the direction of this box's height.
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CVector2D v; // Unit vector along the direction of this box's width.
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float h; // Half this box's height.
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float w; // Half this box's width.
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CBoundingBox( float _x, float _y, float _orientation, float _width, float _height );
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void setPosition( float _x, float _y );
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void setDimensions( float _width, float _height );
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void setOrientation( float _orientation );
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bool _intersects( CBoundingObject* obj, CVector2D* delta );
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};
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#endif
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