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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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* Math functions
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*
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* by WangLu
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* 2012.11.29
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*/
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#ifndef MATH_H__
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#define MATH_H__
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#include <cmath>
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#include "const.h"
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namespace pdf2htmlEX {
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static inline double round(double x) { return (std::abs(x) > EPS) ? x : 0.0; }
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static inline bool equal(double x, double y) { return std::abs(x-y) <= EPS; }
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static inline bool is_positive(double x) { return x > EPS; }
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static inline bool tm_equal(const double * tm1, const double * tm2, int size = 6)
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{
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for(int i = 0; i < size; ++i)
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if(!equal(tm1[i], tm2[i]))
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return false;
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return true;
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}
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static inline void tm_multiply(double * result, const double * m1, const double * m2)
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{
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result[0] = m1[0] * m2[0] + m1[2] * m2[1];
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result[1] = m1[1] * m2[0] + m1[3] * m2[1];
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result[2] = m1[0] * m2[2] + m1[2] * m2[3];
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result[3] = m1[1] * m2[2] + m1[3] * m2[3];
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result[4] = m1[0] * m2[4] + m1[2] * m2[5] + m1[4];
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result[5] = m1[1] * m2[4] + m1[3] * m2[5] + m1[5];
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}
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static inline double hypot(double x, double y) { return std::sqrt(x*x+y*y); }
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void tm_transform(const double * tm, double & x, double & y, bool is_delta = false);
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void tm_multiply(double * tm_left, const double * tm_right);
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} //namespace pdf2htmlEX
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#endif //MATH_H__
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