Adapted easings as single header and inline functions
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@ -1,6 +1,12 @@
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/*******************************************************************************************
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*
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* raylib Easings - Useful easing functions for values animation
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* raylib easings (header only file)
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*
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* Useful easing functions for values animation
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*
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* This header uses:
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* #define EASINGS_STATIC_INLINE // Inlines all functions code, so it runs faster.
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* // This requires lots of memory on system.
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*
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* A port of Robert Penner's easing equations to C (http://robertpenner.com/easing/)
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*
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@ -56,6 +62,14 @@
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#ifndef EASINGS_H
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#define EASINGS_H
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#define EASINGS_STATIC_INLINE // NOTE: By default, compile functions as static inline
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#if defined(EASINGS_STATIC_INLINE)
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#define EASEDEF static inline
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#else
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#define EASEDEF extern
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#endif
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#include <math.h>
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#ifdef __cplusplus
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@ -63,47 +77,47 @@ extern "C" { // Prevents name mangling of functions
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#endif
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// Linear Easing functions
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float EaseLinearNone(float t, float b, float c, float d) { return (c*t/d + b); }
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float EaseLinearIn(float t, float b, float c, float d) { return (c*t/d + b); }
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float EaseLinearOut(float t, float b, float c, float d) { return (c*t/d + b); }
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float EaseLinearInOut(float t,float b, float c, float d) { return (c*t/d + b); }
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EASEDEF float EaseLinearNone(float t, float b, float c, float d) { return (c*t/d + b); }
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EASEDEF float EaseLinearIn(float t, float b, float c, float d) { return (c*t/d + b); }
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EASEDEF float EaseLinearOut(float t, float b, float c, float d) { return (c*t/d + b); }
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EASEDEF float EaseLinearInOut(float t,float b, float c, float d) { return (c*t/d + b); }
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// Sine Easing functions
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float EaseSineIn(float t, float b, float c, float d) { return (-c*cos(t/d*(PI/2)) + c + b); }
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float EaseSineOut(float t, float b, float c, float d) { return (c*sin(t/d*(PI/2)) + b); }
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float EaseSineInOut(float t, float b, float c, float d) { return (-c/2*(cos(PI*t/d) - 1) + b); }
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EASEDEF float EaseSineIn(float t, float b, float c, float d) { return (-c*cos(t/d*(PI/2)) + c + b); }
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EASEDEF float EaseSineOut(float t, float b, float c, float d) { return (c*sin(t/d*(PI/2)) + b); }
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EASEDEF float EaseSineInOut(float t, float b, float c, float d) { return (-c/2*(cos(PI*t/d) - 1) + b); }
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// Circular Easing functions
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float EaseCircIn(float t, float b, float c, float d) { return (-c*(sqrt(1 - (t/=d)*t) - 1) + b); }
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float EaseCircOut(float t, float b, float c, float d) { return (c*sqrt(1 - (t=t/d-1)*t) + b); }
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float EaseCircInOut(float t, float b, float c, float d)
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EASEDEF float EaseCircIn(float t, float b, float c, float d) { return (-c*(sqrt(1 - (t/=d)*t) - 1) + b); }
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EASEDEF float EaseCircOut(float t, float b, float c, float d) { return (c*sqrt(1 - (t=t/d-1)*t) + b); }
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EASEDEF float EaseCircInOut(float t, float b, float c, float d)
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{
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if ((t/=d/2) < 1) return (-c/2*(sqrt(1 - t*t) - 1) + b);
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return (c/2*(sqrt(1 - t*(t-=2)) + 1) + b);
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}
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// Cubic Easing functions
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float EaseCubicIn(float t, float b, float c, float d) { return (c*(t/=d)*t*t + b); }
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float EaseCubicOut(float t, float b, float c, float d) { return (c*((t=t/d-1)*t*t + 1) + b); }
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float EaseCubicInOut(float t, float b, float c, float d)
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EASEDEF float EaseCubicIn(float t, float b, float c, float d) { return (c*(t/=d)*t*t + b); }
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EASEDEF float EaseCubicOut(float t, float b, float c, float d) { return (c*((t=t/d-1)*t*t + 1) + b); }
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EASEDEF float EaseCubicInOut(float t, float b, float c, float d)
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{
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if ((t/=d/2) < 1) return (c/2*t*t*t + b);
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return (c/2*((t-=2)*t*t + 2) + b);
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}
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// Quadratic Easing functions
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float EaseQuadIn(float t, float b, float c, float d) { return (c*(t/=d)*t + b); }
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float EaseQuadOut(float t, float b, float c, float d) { return (-c*(t/=d)*(t-2) + b); }
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float EaseQuadInOut(float t, float b, float c, float d)
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EASEDEF float EaseQuadIn(float t, float b, float c, float d) { return (c*(t/=d)*t + b); }
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EASEDEF float EaseQuadOut(float t, float b, float c, float d) { return (-c*(t/=d)*(t-2) + b); }
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EASEDEF float EaseQuadInOut(float t, float b, float c, float d)
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{
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if ((t/=d/2) < 1) return (((c/2)*(t*t)) + b);
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return (-c/2*(((t-2)*(--t)) - 1) + b);
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}
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// Exponential Easing functions
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float EaseExpoIn(float t, float b, float c, float d) { return (t == 0) ? b : (c*pow(2, 10*(t/d - 1)) + b); }
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float EaseExpoOut(float t, float b, float c, float d) { return (t == d) ? (b + c) : (c*(-pow(2, -10*t/d) + 1) + b); }
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float EaseExpoInOut(float t, float b, float c, float d)
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EASEDEF float EaseExpoIn(float t, float b, float c, float d) { return (t == 0) ? b : (c*pow(2, 10*(t/d - 1)) + b); }
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EASEDEF float EaseExpoOut(float t, float b, float c, float d) { return (t == d) ? (b + c) : (c*(-pow(2, -10*t/d) + 1) + b); }
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EASEDEF float EaseExpoInOut(float t, float b, float c, float d)
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{
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if (t == 0) return b;
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if (t == d) return (b + c);
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@ -113,20 +127,20 @@ float EaseExpoInOut(float t, float b, float c, float d)
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}
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// Back Easing functions
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float EaseBackIn(float t, float b, float c, float d)
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EASEDEF float EaseBackIn(float t, float b, float c, float d)
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{
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float s = 1.70158f;
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float postFix = t/=d;
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return (c*(postFix)*t*((s + 1)*t - s) + b);
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}
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float EaseBackOut(float t, float b, float c, float d)
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EASEDEF float EaseBackOut(float t, float b, float c, float d)
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{
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float s = 1.70158f;
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return (c*((t=t/d-1)*t*((s + 1)*t + s) + 1) + b);
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}
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float EaseBackInOut(float t, float b, float c, float d)
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EASEDEF float EaseBackInOut(float t, float b, float c, float d)
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{
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float s = 1.70158f;
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if ((t/=d/2) < 1) return (c/2*(t*t*(((s*=(1.525f)) + 1)*t - s)) + b);
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@ -136,8 +150,7 @@ float EaseBackInOut(float t, float b, float c, float d)
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}
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// Bounce Easing functions
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float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d-t, 0, c, d) + b); }
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float EaseBounceOut(float t, float b, float c, float d)
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EASEDEF float EaseBounceOut(float t, float b, float c, float d)
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{
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if ((t/=d) < (1/2.75f))
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{
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@ -160,14 +173,15 @@ float EaseBounceOut(float t, float b, float c, float d)
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}
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}
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float EaseBounceInOut(float t, float b, float c, float d)
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EASEDEF float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d-t, 0, c, d) + b); }
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EASEDEF float EaseBounceInOut(float t, float b, float c, float d)
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{
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if (t < d/2) return (EaseBounceIn(t*2, 0, c, d)*0.5f + b);
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else return (EaseBounceOut(t*2-d, 0, c, d)*0.5f + c*0.5f + b);
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}
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// Elastic Easing functions
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float EaseElasticIn(float t, float b, float c, float d)
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EASEDEF float EaseElasticIn(float t, float b, float c, float d)
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{
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if (t == 0) return b;
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if ((t/=d) == 1) return (b + c);
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@ -180,7 +194,7 @@ float EaseElasticIn(float t, float b, float c, float d)
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return (-(postFix*sin((t*d-s)*(2*PI)/p )) + b);
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}
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float EaseElasticOut(float t, float b, float c, float d)
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EASEDEF float EaseElasticOut(float t, float b, float c, float d)
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{
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if (t == 0) return b;
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if ((t/=d) == 1) return (b + c);
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@ -192,7 +206,7 @@ float EaseElasticOut(float t, float b, float c, float d)
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return (a*pow(2,-10*t)*sin((t*d-s)*(2*PI)/p) + c + b);
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}
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float EaseElasticInOut(float t, float b, float c, float d)
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EASEDEF float EaseElasticInOut(float t, float b, float c, float d)
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{
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if (t == 0) return b;
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if ((t/=d/2) == 2) return (b + c);
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