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727b147268
As those functions are not game specific per se, they can be part of base instead. Closes #3334.
19 lines
626 B
C++
19 lines
626 B
C++
#include "bezier.h"
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CCubicBezier CCubicBezier::With(float Start, float StartDerivative, float EndDerivative, float End)
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{
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return CCubicBezier(Start, Start + StartDerivative / 3, End - EndDerivative / 3, End);
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}
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// f(t) = (1-t)³ a + 3(1-t)²t b + 3(1-t)t² c + t³ d
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float CCubicBezier::Evaluate(float t) const
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{
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return (1 - t) * (1 - t) * (1 - t) * a + 3 * (1 - t) * (1 - t) * t * b + 3 * (1 - t) * t * t * c + t * t * t * d;
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}
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// f(t) = 3(1-t)²(b-a) + 6(1-t)t(c-b) + 3t²(d-c)
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float CCubicBezier::Derivative(float t) const
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{
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return 3 * (1 - t) * (1 - t) * (b - a) + 6 * (1 - t) * t * (c - b) + 3 * t * t * (d - c);
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}
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