125 lines
2.8 KiB
C++
125 lines
2.8 KiB
C++
#ifndef BBOX3_H
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#define BBOX3_H
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#include "Point3.h"
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class BBox3 {
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private:
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static constexpr float MAX = +99999;
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static constexpr float MIN = -99999;
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/** minimum */
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Point3 p1;
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/** maximum */
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Point3 p2;
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public:
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/** empty ctor */
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BBox3() : p1(MAX,MAX,MAX), p2(MIN,MIN,MIN) {;}
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/** ctor with min and max */
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BBox3(const Point3 min, const Point3 max) : p1(min), p2(max) {;}
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/** create a bbox around the given point */
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static BBox3 around(const Point3 center, const Point3 size) {
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return BBox3(center-size/2, center+size/2);
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}
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/** adjust the bounding-box by adding this point */
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void add(const Point3& p) {
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if (p.x > p2.x) {p2.x = p.x;}
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if (p.y > p2.y) {p2.y = p.y;}
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if (p.z > p2.z) {p2.z = p.z;}
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if (p.x < p1.x) {p1.x = p.x;}
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if (p.y < p1.y) {p1.y = p.y;}
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if (p.z < p1.z) {p1.z = p.z;}
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}
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/** add the given bounding-box to this one */
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void add(const BBox3& bb) {
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add(bb.getMin());
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add(bb.getMax());
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}
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/** get the bbox's minimum */
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const Point3& getMin() const {return p1;}
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/** get the bbox's maximum */
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const Point3& getMax() const {return p2;}
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/** get the bbox's size */
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const Point3 getSize() const {return p2-p1;}
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/** get the boox's center */
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const Point3 getCenter() const {return (p2+p1)/2;}
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/** equal? */
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bool operator == (const BBox3& o) const {
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return (p1.x == o.p1.x) &&
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(p1.y == o.p1.y) &&
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(p1.z == o.p1.z) &&
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(p2.x == o.p2.x) &&
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(p2.y == o.p2.y) &&
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(p2.z == o.p2.z);
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}
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/** shrink the bbox in each dimension by the given amount */
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void shrink(const float v) {
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shrink(Point3(v,v,v));
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}
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/** shrink the bbox by the amount given for each dimension */
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void shrink(const Point3& p) {
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p1 += p; // increase minimum
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p2 -= p; // decrease maximum
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}
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/** grow the bbox by the amount given for each dimension */
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void grow(const float v) {
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grow(Point3(v,v,v));
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}
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/** grow the bbox by the amount given for each dimension */
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void grow(const Point3& p) {
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p1 -= p; // decrease minimum
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p2 += p; // increase maximum
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}
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/** set both, min/max z to the same value */
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void setZ(const float z) {
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p1.z = z;
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p2.z = z;
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}
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void setMinZ(const float z) {this->p1.z = z;}
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void setMaxZ(const float z) {this->p2.z = z;}
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/** does the bbox contain the given point? */
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bool contains(const Point3& p) const {
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if (p.x < p1.x) {return false;}
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if (p.x > p2.x) {return false;}
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if (p.y < p1.y) {return false;}
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if (p.y > p2.y) {return false;}
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if (p.z < p1.z) {return false;}
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if (p.z > p2.z) {return false;}
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return true;
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}
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/** combine two bboxes */
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static BBox3 join(const BBox3& bb1, const BBox3& bb2) {
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const Point3 min( std::min(bb1.p1.x, bb2.p1.x), std::min(bb1.p1.y, bb2.p1.y), std::min(bb1.p1.z, bb2.p1.z) );
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const Point3 max( std::max(bb1.p2.x, bb2.p2.x), std::max(bb1.p2.y, bb2.p2.y), std::max(bb1.p2.z, bb2.p2.z) );
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return BBox3(min,max);
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}
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};
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#endif // BBOX3_H
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