50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
#include "Rectangle.h"
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bool Rectangle::contains(const Vertex &v) const {
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return (edges(v) == EDGE_NONE);
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}
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int Rectangle::edges(const Vertex &v) const {
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int ret = EDGE_NONE;
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if(v.getX() < v1.getX()) ret |= EDGE_LEFT;
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else if(v.getX() >= v2.getX()) ret |= EDGE_RIGHT;
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if(v.getY() < v1.getY()) ret |= EDGE_TOP;
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else if(v.getY() >= v2.getY()) ret |= EDGE_BOTTOM;
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return ret;
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}
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int Rectangle::intersects(const Line &l, Vertex *v, int edge) const {
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const Line top(v1.getX(), v1.getY(), v2.getX(), v1.getY());
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const Line bottom(v1.getX(), v2.getY(), v2.getX(), v2.getY());
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const Line left(v1.getX(), v1.getY(), v1.getX(), v2.getY());
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const Line right(v2.getX(), v1.getY(), v2.getX(), v2.getY());
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if(edge == EDGE_NONE) edge = edges(l.getVertex1());
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if((edge & EDGE_TOP) && (top.intersects(l, v) == INTERSECTION_SEGMENT_SEGMENT))
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return EDGE_TOP;
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if((edge & EDGE_BOTTOM) && (bottom.intersects(l, v) == INTERSECTION_SEGMENT_SEGMENT))
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return EDGE_BOTTOM;
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if((edge & EDGE_LEFT) && (left.intersects(l, v) == INTERSECTION_SEGMENT_SEGMENT))
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return EDGE_LEFT;
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if((edge & EDGE_RIGHT) && (right.intersects(l, v) == INTERSECTION_SEGMENT_SEGMENT))
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return EDGE_RIGHT;
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v->setLocation(0, 0);
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return EDGE_NONE;
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}
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int Rectangle::intersects(const Line &l, Vertex *v1, Vertex *v2, int edge) const {
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int ret = EDGE_NONE;
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if(edge == EDGE_NONE) edge = edges(l.getVertex1());
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ret |= intersects(l, v1, edge);
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ret |= intersects(l, v2, EDGE_ALL^edge);
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return ret;
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}
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