44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#pragma once
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namespace mt
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{
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class Path
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{
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public:
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void SetPoints(const List<vec3>& points);
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void SetScale(const List<float>& scale);
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void SetRotation(const List<float>& rotation);
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vec3 GetPoint(float t) const;
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float GetScale(float t) const;
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float GetRotation(float t) const;
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vec3 GetDirection(float t) const;
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private:
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template <typename T> static void GetValues(const List<T>& source, float& t, T& p0, T& p1, T& p2, T& p3)
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{
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auto maxT = source.Count();
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auto p1Index = (int)Math::Min(t * maxT, maxT - 1.0f);
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auto p0Index = (int)Math::Max(p1Index - 1.0f, 0.0f);
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auto p2Index = (int)Math::Min(p1Index + 1.0f, maxT - 1.0f);
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auto p3Index = (int)Math::Min(p2Index + 1.0f, maxT - 1.0f);
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p1 = source[p1Index];
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p2 = p1Index == p2Index ? p1 + (p1 - source[p0Index]) : source[p2Index];
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p0 = p0Index == p1Index ? p1 - (p2 - p1) : source[p0Index];
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p3 = p3Index == p2Index ? p1 + (p2 - p1) : source[p3Index];
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t = (t - (1.0f / maxT * p1Index)) / (1.0f / maxT);
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}
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static float Spline(float p0, float p1, float p2, float p3, float t);
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static vec3 Spline(const vec3& p0, const vec3& p1, const vec3& p2, const vec3& p3, float t);
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private:
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List<vec3> points;
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List<float> rotation;
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List<float> scale;
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};
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}
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