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Easings: Add function descriptions (#2471)

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Rob Loach 2022-05-12 08:48:51 -04:00 • committed by GitHub
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src/extras/easings.h
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@ -101,47 +101,47 @@ extern "C" { // Prevents name mangling of functions
#endif #endif
// Linear Easing functions // Linear Easing functions
EASEDEF float EaseLinearNone(float t, float b, float c, float d) { return (c*t/d + b); } EASEDEF float EaseLinearNone(float t, float b, float c, float d) { return (c*t/d + b); } // Ease: Linear
EASEDEF float EaseLinearIn(float t, float b, float c, float d) { return (c*t/d + b); } EASEDEF float EaseLinearIn(float t, float b, float c, float d) { return (c*t/d + b); } // Ease: Linear In
EASEDEF float EaseLinearOut(float t, float b, float c, float d) { return (c*t/d + b); } EASEDEF float EaseLinearOut(float t, float b, float c, float d) { return (c*t/d + b); } // Ease: Linear Out
EASEDEF float EaseLinearInOut(float t,float b, float c, float d) { return (c*t/d + b); } EASEDEF float EaseLinearInOut(float t, float b, float c, float d) { return (c*t/d + b); } // Ease: Linear In Out
// Sine Easing functions // Sine Easing functions
EASEDEF float EaseSineIn(float t, float b, float c, float d) { return (-c*cosf(t/d*(PI/2.0f)) + c + b); } EASEDEF float EaseSineIn(float t, float b, float c, float d) { return (-c*cosf(t/d*(PI/2.0f)) + c + b); } // Ease: Sine In
EASEDEF float EaseSineOut(float t, float b, float c, float d) { return (c*sinf(t/d*(PI/2.0f)) + b); } EASEDEF float EaseSineOut(float t, float b, float c, float d) { return (c*sinf(t/d*(PI/2.0f)) + b); } // Ease: Sine Out
EASEDEF float EaseSineInOut(float t, float b, float c, float d) { return (-c/2.0f*(cosf(PI*t/d) - 1.0f) + b); } EASEDEF float EaseSineInOut(float t, float b, float c, float d) { return (-c/2.0f*(cosf(PI*t/d) - 1.0f) + b); } // Ease: Sine Out
// Circular Easing functions // Circular Easing functions
EASEDEF float EaseCircIn(float t, float b, float c, float d) { t /= d; return (-c*(sqrtf(1.0f - t*t) - 1.0f) + b); } EASEDEF float EaseCircIn(float t, float b, float c, float d) { t /= d; return (-c*(sqrtf(1.0f - t*t) - 1.0f) + b); } // Ease: Circular In
EASEDEF float EaseCircOut(float t, float b, float c, float d) { t = t/d - 1.0f; return (c*sqrtf(1.0f - t*t) + b); } EASEDEF float EaseCircOut(float t, float b, float c, float d) { t = t/d - 1.0f; return (c*sqrtf(1.0f - t*t) + b); } // Ease: Circular Out
EASEDEF float EaseCircInOut(float t, float b, float c, float d) EASEDEF float EaseCircInOut(float t, float b, float c, float d) // Ease: Circular In Out
{ {
if ((t/=d/2.0f) < 1.0f) return (-c/2.0f*(sqrtf(1.0f - t*t) - 1.0f) + b); if ((t/=d/2.0f) < 1.0f) return (-c/2.0f*(sqrtf(1.0f - t*t) - 1.0f) + b);
t -= 2.0f; return (c/2.0f*(sqrtf(1.0f - t*t) + 1.0f) + b); t -= 2.0f; return (c/2.0f*(sqrtf(1.0f - t*t) + 1.0f) + b);
} }
// Cubic Easing functions // Cubic Easing functions
EASEDEF float EaseCubicIn(float t, float b, float c, float d) { t /= d; return (c*t*t*t + b); } EASEDEF float EaseCubicIn(float t, float b, float c, float d) { t /= d; return (c*t*t*t + b); } // Ease: Cubic In
EASEDEF float EaseCubicOut(float t, float b, float c, float d) { t = t/d - 1.0f; return (c*(t*t*t + 1.0f) + b); } EASEDEF float EaseCubicOut(float t, float b, float c, float d) { t = t/d - 1.0f; return (c*(t*t*t + 1.0f) + b); } // Ease: Cubic Out
EASEDEF float EaseCubicInOut(float t, float b, float c, float d) EASEDEF float EaseCubicInOut(float t, float b, float c, float d) // Ease: Cubic In Out
{ {
if ((t/=d/2.0f) < 1.0f) return (c/2.0f*t*t*t + b); if ((t/=d/2.0f) < 1.0f) return (c/2.0f*t*t*t + b);
t -= 2.0f; return (c/2.0f*(t*t*t + 2.0f) + b); t -= 2.0f; return (c/2.0f*(t*t*t + 2.0f) + b);
} }
// Quadratic Easing functions // Quadratic Easing functions
EASEDEF float EaseQuadIn(float t, float b, float c, float d) { t /= d; return (c*t*t + b); } EASEDEF float EaseQuadIn(float t, float b, float c, float d) { t /= d; return (c*t*t + b); } // Ease: Quadratic In
EASEDEF float EaseQuadOut(float t, float b, float c, float d) { t /= d; return (-c*t*(t - 2.0f) + b); } EASEDEF float EaseQuadOut(float t, float b, float c, float d) { t /= d; return (-c*t*(t - 2.0f) + b); } // Ease: Quadratic Out
EASEDEF float EaseQuadInOut(float t, float b, float c, float d) EASEDEF float EaseQuadInOut(float t, float b, float c, float d) // Ease: Quadratic In Out
{ {
if ((t/=d/2) < 1) return (((c/2)*(t*t)) + b); if ((t/=d/2) < 1) return (((c/2)*(t*t)) + b);
return (-c/2.0f*(((t - 1.0f)*(t - 3.0f)) - 1.0f) + b); return (-c/2.0f*(((t - 1.0f)*(t - 3.0f)) - 1.0f) + b);
} }
// Exponential Easing functions // Exponential Easing functions
EASEDEF float EaseExpoIn(float t, float b, float c, float d) { return (t == 0.0f) ? b : (c*powf(2.0f, 10.0f*(t/d - 1.0f)) + b); } EASEDEF float EaseExpoIn(float t, float b, float c, float d) { return (t == 0.0f) ? b : (c*powf(2.0f, 10.0f*(t/d - 1.0f)) + b); } // Ease: Exponential In
EASEDEF float EaseExpoOut(float t, float b, float c, float d) { return (t == d) ? (b + c) : (c*(-powf(2.0f, -10.0f*t/d) + 1.0f) + b); } EASEDEF float EaseExpoOut(float t, float b, float c, float d) { return (t == d) ? (b + c) : (c*(-powf(2.0f, -10.0f*t/d) + 1.0f) + b); } // Ease: Exponential Out
EASEDEF float EaseExpoInOut(float t, float b, float c, float d) EASEDEF float EaseExpoInOut(float t, float b, float c, float d) // Ease: Exponential In Out
{ {
if (t == 0.0f) return b; if (t == 0.0f) return b;
if (t == d) return (b + c); if (t == d) return (b + c);
@ -151,21 +151,21 @@ EASEDEF float EaseExpoInOut(float t, float b, float c, float d)
} }
// Back Easing functions // Back Easing functions
EASEDEF float EaseBackIn(float t, float b, float c, float d) EASEDEF float EaseBackIn(float t, float b, float c, float d) // Ease: Back In
{ {
float s = 1.70158f; float s = 1.70158f;
float postFix = t/=d; float postFix = t/=d;
return (c*(postFix)*t*((s + 1.0f)*t - s) + b); return (c*(postFix)*t*((s + 1.0f)*t - s) + b);
} }
EASEDEF float EaseBackOut(float t, float b, float c, float d) EASEDEF float EaseBackOut(float t, float b, float c, float d) // Ease: Back Out
{ {
float s = 1.70158f; float s = 1.70158f;
t = t/d - 1.0f; t = t/d - 1.0f;
return (c*(t*t*((s + 1.0f)*t + s) + 1.0f) + b); return (c*(t*t*((s + 1.0f)*t + s) + 1.0f) + b);
} }
EASEDEF float EaseBackInOut(float t, float b, float c, float d) EASEDEF float EaseBackInOut(float t, float b, float c, float d) // Ease: Back In Out
{ {
float s = 1.70158f; float s = 1.70158f;
if ((t/=d/2.0f) < 1.0f) if ((t/=d/2.0f) < 1.0f)
@ -180,7 +180,7 @@ EASEDEF float EaseBackInOut(float t, float b, float c, float d)
} }
// Bounce Easing functions // Bounce Easing functions
EASEDEF float EaseBounceOut(float t, float b, float c, float d) EASEDEF float EaseBounceOut(float t, float b, float c, float d) // Ease: Bounce Out
{ {
if ((t/=d) < (1.0f/2.75f)) if ((t/=d) < (1.0f/2.75f))
{ {
@ -203,15 +203,15 @@ EASEDEF float EaseBounceOut(float t, float b, float c, float d)
} }
} }
EASEDEF float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d - t, 0.0f, c, d) + b); } EASEDEF float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d - t, 0.0f, c, d) + b); } // Ease: Bounce In
EASEDEF float EaseBounceInOut(float t, float b, float c, float d) EASEDEF float EaseBounceInOut(float t, float b, float c, float d) // Ease: Bounce In Out
{ {
if (t < d/2.0f) return (EaseBounceIn(t*2.0f, 0.0f, c, d)*0.5f + b); if (t < d/2.0f) return (EaseBounceIn(t*2.0f, 0.0f, c, d)*0.5f + b);
else return (EaseBounceOut(t*2.0f - d, 0.0f, c, d)*0.5f + c*0.5f + b); else return (EaseBounceOut(t*2.0f - d, 0.0f, c, d)*0.5f + c*0.5f + b);
} }
// Elastic Easing functions // Elastic Easing functions
EASEDEF float EaseElasticIn(float t, float b, float c, float d) EASEDEF float EaseElasticIn(float t, float b, float c, float d) // Ease: Elastic In
{ {
if (t == 0.0f) return b; if (t == 0.0f) return b;
if ((t/=d) == 1.0f) return (b + c); if ((t/=d) == 1.0f) return (b + c);
@ -224,7 +224,7 @@ EASEDEF float EaseElasticIn(float t, float b, float c, float d)
return (-(postFix*sinf((t*d-s)*(2.0f*PI)/p )) + b); return (-(postFix*sinf((t*d-s)*(2.0f*PI)/p )) + b);
} }
EASEDEF float EaseElasticOut(float t, float b, float c, float d) EASEDEF float EaseElasticOut(float t, float b, float c, float d) // Ease: Elastic Out
{ {
if (t == 0.0f) return b; if (t == 0.0f) return b;
if ((t/=d) == 1.0f) return (b + c); if ((t/=d) == 1.0f) return (b + c);
@ -236,7 +236,7 @@ EASEDEF float EaseElasticOut(float t, float b, float c, float d)
return (a*powf(2.0f,-10.0f*t)*sinf((t*d-s)*(2.0f*PI)/p) + c + b); return (a*powf(2.0f,-10.0f*t)*sinf((t*d-s)*(2.0f*PI)/p) + c + b);
} }
EASEDEF float EaseElasticInOut(float t, float b, float c, float d) EASEDEF float EaseElasticInOut(float t, float b, float c, float d) // Ease: Elastic In Out
{ {
if (t == 0.0f) return b; if (t == 0.0f) return b;
if ((t/=d/2.0f) == 2.0f) return (b + c); if ((t/=d/2.0f) == 2.0f) return (b + c);