31 lines
745 B
C
31 lines
745 B
C
#include "CgeMath.h"
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#include <string.h>
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#define EPSILON 0.00001f
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#define PI 3.14159265358979323846f
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int CgeLineFromPoints(const float a[2], const float b[2], float out[3]) {
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float tmp[2];
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tmp[0] = a[1] - b[1];
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tmp[1] = b[0] - a[0];
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if (CgeVec2fNormalEx(tmp, tmp) < EPSILON)
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return 0;
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out[2] = CgeVec2fDot(tmp, a);
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memcpy(out, tmp, sizeof(tmp));
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return 1;
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}
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float CgeLineDistance(const float line[3], const float point[2]) {
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return CgeVec2fDot(line, point) - line[2];
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}
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void CgeLineClosestPoint(const float line[3], const float point[2],
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float out[2]) {
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float tmp[2];
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CgeVec2fScale(line, CgeLineDistance(line, point), tmp);
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CgeVec2fSub(point, tmp, out);
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}
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