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lottie/vector: add angle api to VLine class

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Change-Id: Iaa839e5a4e7a0517c7a9a01cb8e0de972dba95c6
This commit is contained in:
subhransu mohanty
2018-11-15 11:36:58 +09:00
parent 99886884a4
commit fe211418e6
1 changed files with 11 additions and 2 deletions
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13
src/vector/vline.h
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@@ -21,7 +21,7 @@ public:
void splitAtLength(float length, VLine &left, VLine &right) const;
VPointF p1() const { return {mX1, mY1}; }
VPointF p2() const { return {mX2, mY2}; }
float angle() const;
static float length(float x1, float y1, float x2, float y2);
private:
@@ -31,6 +31,15 @@ private:
float mY2{0};
};
inline float VLine::angle() const
{
const float dx = mX2 - mX1;
const float dy = mY2 - mY1;
const float theta = std::atan2(dy, dx) * 180.0 / M_PI;
return theta;
}
// approximate sqrt(x*x + y*y) using alpha max plus beta min algorithm.
// With alpha = 1, beta = 3/8, giving results with the largest error less
// than 7% compared to the exact value.
@@ -62,4 +71,4 @@ inline void VLine::splitAtLength(float lengthAt, VLine &left, VLine &right) cons
right.mY2 = mY2;
}
#endif //VLINE_H
#endif //VLINE_H