57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#include "SpaceSegment.h"
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SpaceSegment::SpaceSegment(const Vector3& start, const Vector3& end):
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start(start), end(end)
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{
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}
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bool SpaceSegment::intersectYInterval(double ymin, double ymax)
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{
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if (start.y > ymax)
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{
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if (end.y >= ymax)
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{
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return false;
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}
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else
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{
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Vector3 diff = end.sub(start);
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start = start.add(diff.scale((ymax - start.y) / diff.y));
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if (end.y < ymin)
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{
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end = end.add(diff.scale((ymin - end.y) / diff.y));
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}
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}
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}
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else if (start.y < ymin)
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{
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if (end.y <= ymin)
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{
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return false;
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}
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else
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{
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Vector3 diff = end.sub(start);
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start = start.add(diff.scale((ymin - start.y) / diff.y));
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if (end.y >= ymax)
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{
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end = end.add(diff.scale((ymax - end.y) / diff.y));
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}
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}
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}
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else /* start is inside layer */
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{
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Vector3 diff = end.sub(start);
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if (end.y > ymax)
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{
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end = start.add(diff.scale((ymax - start.y) / diff.y));
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}
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else if (end.y < ymin)
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{
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end = start.add(diff.scale((ymin - start.y) / diff.y));
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}
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}
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return true;
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}
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