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88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
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#ifndef __M_BBOX_H__
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#define __M_BBOX_H__
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#include <float.h>
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#include "vectors.h"
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enum
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{
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BOXTOP,
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BOXBOTTOM,
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BOXLEFT,
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BOXRIGHT
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}; // bbox coordinates
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class FBoundingBox
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{
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public:
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FBoundingBox()
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{
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ClearBox();
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}
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FBoundingBox(double left, double bottom, double right, double top)
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{
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m_Box[BOXTOP] = top;
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m_Box[BOXLEFT] = left;
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m_Box[BOXRIGHT] = right;
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m_Box[BOXBOTTOM] = bottom;
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}
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FBoundingBox(double x, double y, double radius)
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{
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setBox(x, y, radius);
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}
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void setBox(double x, double y, double radius)
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{
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m_Box[BOXTOP] = y + radius;
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m_Box[BOXLEFT] = x - radius;
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m_Box[BOXRIGHT] = x + radius;
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m_Box[BOXBOTTOM] = y - radius;
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}
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void ClearBox ()
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{
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m_Box[BOXTOP] = m_Box[BOXRIGHT] = -FLT_MAX;
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m_Box[BOXBOTTOM] = m_Box[BOXLEFT] = FLT_MAX;
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}
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// Returns a bounding box that encloses both bounding boxes
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FBoundingBox operator | (const FBoundingBox &box2) const
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{
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return FBoundingBox(m_Box[BOXLEFT] < box2.m_Box[BOXLEFT] ? m_Box[BOXLEFT] : box2.m_Box[BOXLEFT],
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m_Box[BOXBOTTOM] < box2.m_Box[BOXBOTTOM] ? m_Box[BOXBOTTOM] : box2.m_Box[BOXBOTTOM],
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m_Box[BOXRIGHT] > box2.m_Box[BOXRIGHT] ? m_Box[BOXRIGHT] : box2.m_Box[BOXRIGHT],
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m_Box[BOXTOP] > box2.m_Box[BOXTOP] ? m_Box[BOXTOP] : box2.m_Box[BOXTOP]);
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}
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void AddToBox(const DVector2 &pos)
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{
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if (pos.X < m_Box[BOXLEFT])
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m_Box[BOXLEFT] = pos.X;
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if (pos.X > m_Box[BOXRIGHT])
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m_Box[BOXRIGHT] = pos.X;
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if (pos.Y < m_Box[BOXBOTTOM])
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m_Box[BOXBOTTOM] = pos.Y;
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if (pos.Y > m_Box[BOXTOP])
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m_Box[BOXTOP] = pos.Y;
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}
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inline double Top () const { return m_Box[BOXTOP]; }
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inline double Bottom () const { return m_Box[BOXBOTTOM]; }
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inline double Left () const { return m_Box[BOXLEFT]; }
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inline double Right () const { return m_Box[BOXRIGHT]; }
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void Set(int index, double value) {m_Box[index] = value;}
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protected:
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double m_Box[4];
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};
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#endif //__M_BBOX_H__
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