116 lines
2.6 KiB
C++
Executable File
116 lines
2.6 KiB
C++
Executable File
#ifndef LINE2D_H
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#define LINE2D_H
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//#include <KLib/geo/Line.h>
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#include "Point2.h"
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class Line2 {
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public:
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Point2 p1;
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Point2 p2;
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public:
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/** empty ctor */
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Line2() : p1(), p2() {;}
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/** value ctor */
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Line2(const Point2 p1, const Point2 p2) : p1(p1), p2(p2) {;}
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/** value ctor */
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Line2(const float x1, const float y1, const float x2, const float y2) : p1(x1,y1), p2(x2,y2) {;}
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// bool getSegmentIntersection(const Line& other) const {
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// static K::Point p;
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// return K::Line::getSegmentIntersection(other, p);
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// }
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/** get intersection between these two lines (unlimited length!) */
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bool getLineIntersection(const Line2& other, Point2& result) const {
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double bx = p2.x - p1.x;
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double by = p2.y - p1.y;
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double dx = other.p2.x - other.p1.x;
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double dy = other.p2.y - other.p1.y;
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double b_dot_d_perp = bx*dy - by*dx;
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if(b_dot_d_perp == 0) {return false;}
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double cx = other.p1.x - p1.x;
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double cy = other.p1.y - p1.y;
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double t = (cx*dy - cy*dx) / b_dot_d_perp;
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result.x = p1.x + t * bx;
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result.y = p1.y + t * by;
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return true;
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}
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bool getSegmentIntersection(const Line2& other) const {
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const double delta = 0.0000001;
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const double bx = p2.x - p1.x;
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const double by = p2.y - p1.y;
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const double dx = other.p2.x - other.p1.x;
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const double dy = other.p2.y - other.p1.y;
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const double b_dot_d_perp = bx*dy - by*dx;
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if (std::abs(b_dot_d_perp) == 0) {return false;}
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const double cx = other.p1.x - p1.x;
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const double cy = other.p1.y - p1.y;
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const double t = (cx * dy - cy * dx) / b_dot_d_perp;
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if(t < 0+delta || t > 1-delta) {return false;}
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const double u = (cx * by - cy * bx) / b_dot_d_perp;
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if(u < 0+delta || u > 1-delta) {return false;}
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return true;
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}
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bool getSegmentIntersection(const Line2& other, Point2& result) const {
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const float delta = 0.000001;
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const float bx = p2.x - p1.x;
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const float by = p2.y - p1.y;
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const float dx = other.p2.x - other.p1.x;
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const float dy = other.p2.y - other.p1.y;
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const float b_dot_d_perp = bx*dy - by*dx;
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if(b_dot_d_perp == 0) {return false;}
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const float cx = other.p1.x - p1.x;
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const float cy = other.p1.y - p1.y;
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const float t = (cx * dy - cy * dx) / b_dot_d_perp;
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if(t < 0+delta || t > 1-delta) {return false;}
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const float u = (cx * by - cy * bx) / b_dot_d_perp;
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if(u < 0+delta || u > 1-delta) {return false;}
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result.x = p1.x + t * bx;
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result.y = p1.y + t * by;
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return true;
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}
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};
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#endif // LINE2D_H
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