diff --git a/examples/others/easings.h b/examples/others/easings.h new file mode 100644 index 00000000..c7ee5649 --- /dev/null +++ b/examples/others/easings.h @@ -0,0 +1,263 @@ +/******************************************************************************************* +* +* raylib easings (header only file) +* +* Useful easing functions for values animation +* +* This header uses: +* #define EASINGS_STATIC_INLINE // Inlines all functions code, so it runs faster. +* // This requires lots of memory on system. +* How to use: +* The four inputs t,b,c,d are defined as follows: +* t = current time (in any unit measure, but same unit as duration) +* b = starting value to interpolate +* c = the total change in value of b that needs to occur +* d = total time it should take to complete (duration) +* +* Example: +* +* int currentTime = 0; +* int duration = 100; +* float startPositionX = 0.0f; +* float finalPositionX = 30.0f; +* float currentPositionX = startPositionX; +* +* while (currentPositionX < finalPositionX) +* { +* currentPositionX = EaseSineIn(currentTime, startPositionX, finalPositionX - startPositionX, duration); +* currentTime++; +* } +* +* A port of Robert Penner's easing equations to C (http://robertpenner.com/easing/) +* +* Robert Penner License +* --------------------------------------------------------------------------------- +* Open source under the BSD License. +* +* Copyright (c) 2001 Robert Penner. All rights reserved. +* +* Redistribution and use in source and binary forms, with or without modification, +* are permitted provided that the following conditions are met: +* +* - Redistributions of source code must retain the above copyright notice, +* this list of conditions and the following disclaimer. +* - Redistributions in binary form must reproduce the above copyright notice, +* this list of conditions and the following disclaimer in the documentation +* and/or other materials provided with the distribution. +* - Neither the name of the author nor the names of contributors may be used +* to endorse or promote products derived from this software without specific +* prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, +* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE +* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED +* OF THE POSSIBILITY OF SUCH DAMAGE. +* --------------------------------------------------------------------------------- +* +* Copyright (c) 2015 Ramon Santamaria +* +* This software is provided "as-is", without any express or implied warranty. In no event +* will the authors be held liable for any damages arising from the use of this software. +* +* Permission is granted to anyone to use this software for any purpose, including commercial +* applications, and to alter it and redistribute it freely, subject to the following restrictions: +* +* 1. The origin of this software must not be misrepresented; you must not claim that you +* wrote the original software. If you use this software in a product, an acknowledgment +* in the product documentation would be appreciated but is not required. +* +* 2. Altered source versions must be plainly marked as such, and must not be misrepresented +* as being the original software. +* +* 3. This notice may not be removed or altered from any source distribution. +* +**********************************************************************************************/ + +#ifndef EASINGS_H +#define EASINGS_H + +#define EASINGS_STATIC_INLINE // NOTE: By default, compile functions as static inline + +#if defined(EASINGS_STATIC_INLINE) + #define EASEDEF static inline +#else + #define EASEDEF extern +#endif + +#include // Required for: sin(), cos(), sqrt(), pow() + +#ifndef PI + #define PI 3.14159265358979323846f //Required as PI is not always defined in math.h +#endif + +#ifdef __cplusplus +extern "C" { // Prevents name mangling of functions +#endif + +// Linear Easing functions +EASEDEF float EaseLinearNone(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); } +EASEDEF float EaseLinearOut(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); } + +// Sine Easing functions +EASEDEF float EaseSineIn(float t, float b, float c, float d) { return (-c*cos(t/d*(PI/2.0f)) + c + b); } +EASEDEF float EaseSineOut(float t, float b, float c, float d) { return (c*sin(t/d*(PI/2.0f)) + b); } +EASEDEF float EaseSineInOut(float t, float b, float c, float d) { return (-c/2.0f*(cos(PI*t/d) - 1.0f) + b); } + +// Circular Easing functions +EASEDEF float EaseCircIn(float t, float b, float c, float d) { t /= d; return (-c*(sqrt(1.0f - t*t) - 1.0f) + b); } +EASEDEF float EaseCircOut(float t, float b, float c, float d) { t = t/d - 1.0f; return (c*sqrt(1.0f - t*t) + b); } +EASEDEF float EaseCircInOut(float t, float b, float c, float d) +{ + if ((t/=d/2.0f) < 1.0f) return (-c/2.0f*(sqrt(1.0f - t*t) - 1.0f) + b); + t -= 2.0f; return (c/2.0f*(sqrt(1.0f - t*t) + 1.0f) + b); +} + +// Cubic Easing functions +EASEDEF float EaseCubicIn(float t, float b, float c, float d) { t /= d; return (c*t*t*t + 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); } +EASEDEF float EaseCubicInOut(float t, float b, float c, float d) +{ + 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); +} + +// Quadratic Easing functions +EASEDEF float EaseQuadIn(float t, float b, float c, float d) { t /= d; return (c*t*t + b); } +EASEDEF float EaseQuadOut(float t, float b, float c, float d) { t /= d; return (-c*t*(t - 2.0f) + b); } +EASEDEF float EaseQuadInOut(float t, float b, float c, float d) +{ + if ((t/=d/2) < 1) return (((c/2)*(t*t)) + b); + return (-c/2.0f*(((t - 1.0f)*(t - 3.0f)) - 1.0f) + b); +} + +// Exponential Easing functions +EASEDEF float EaseExpoIn(float t, float b, float c, float d) { return (t == 0.0f) ? b : (c*pow(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*(-pow(2.0f, -10.0f*t/d) + 1.0f) + b); } +EASEDEF float EaseExpoInOut(float t, float b, float c, float d) +{ + if (t == 0.0f) return b; + if (t == d) return (b + c); + if ((t/=d/2.0f) < 1.0f) return (c/2.0f*pow(2.0f, 10.0f*(t - 1.0f)) + b); + + return (c/2.0f*(-pow(2.0f, -10.0f*(t - 1.0f)) + 2.0f) + b); +} + +// Back Easing functions +EASEDEF float EaseBackIn(float t, float b, float c, float d) +{ + float s = 1.70158f; + float postFix = t/=d; + return (c*(postFix)*t*((s + 1.0f)*t - s) + b); +} + +EASEDEF float EaseBackOut(float t, float b, float c, float d) +{ + float s = 1.70158f; + t = t/d - 1.0f; + return (c*(t*t*((s + 1.0f)*t + s) + 1.0f) + b); +} + +EASEDEF float EaseBackInOut(float t, float b, float c, float d) +{ + float s = 1.70158f; + if ((t/=d/2.0f) < 1.0f) + { + s *= 1.525f; + return (c/2.0f*(t*t*((s + 1.0f)*t - s)) + b); + } + + float postFix = t-=2.0f; + s *= 1.525f; + return (c/2.0f*((postFix)*t*((s + 1.0f)*t + s) + 2.0f) + b); +} + +// Bounce Easing functions +EASEDEF float EaseBounceOut(float t, float b, float c, float d) +{ + if ((t/=d) < (1.0f/2.75f)) + { + return (c*(7.5625f*t*t) + b); + } + else if (t < (2.0f/2.75f)) + { + float postFix = t-=(1.5f/2.75f); + return (c*(7.5625f*(postFix)*t + 0.75f) + b); + } + else if (t < (2.5/2.75)) + { + float postFix = t-=(2.25f/2.75f); + return (c*(7.5625f*(postFix)*t + 0.9375f) + b); + } + else + { + float postFix = t-=(2.625f/2.75f); + return (c*(7.5625f*(postFix)*t + 0.984375f) + b); + } +} + +EASEDEF float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d - t, 0.0f, c, d) + b); } +EASEDEF float EaseBounceInOut(float t, float b, float c, float d) +{ + 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); +} + +// Elastic Easing functions +EASEDEF float EaseElasticIn(float t, float b, float c, float d) +{ + if (t == 0.0f) return b; + if ((t/=d) == 1.0f) return (b + c); + + float p = d*0.3f; + float a = c; + float s = p/4.0f; + float postFix = a*pow(2.0f, 10.0f*(t-=1.0f)); + + return (-(postFix*sin((t*d-s)*(2.0f*PI)/p )) + b); +} + +EASEDEF float EaseElasticOut(float t, float b, float c, float d) +{ + if (t == 0.0f) return b; + if ((t/=d) == 1.0f) return (b + c); + + float p = d*0.3f; + float a = c; + float s = p/4.0f; + + return (a*pow(2.0f,-10.0f*t)*sin((t*d-s)*(2.0f*PI)/p) + c + b); +} + +EASEDEF float EaseElasticInOut(float t, float b, float c, float d) +{ + if (t == 0.0f) return b; + if ((t/=d/2.0f) == 2.0f) return (b + c); + + float p = d*(0.3f*1.5f); + float a = c; + float s = p/4.0f; + + if (t < 1.0f) + { + float postFix = a*pow(2.0f, 10.0f*(t-=1.0f)); + return -0.5f*(postFix*sin((t*d-s)*(2.0f*PI)/p)) + b; + } + + float postFix = a*pow(2.0f, -10.0f*(t-=1.0f)); + + return (postFix*sin((t*d-s)*(2.0f*PI)/p)*0.5f + c + b); +} + +#ifdef __cplusplus +} +#endif + +#endif // EASINGS_H diff --git a/examples/core/easings_example.c b/examples/others/easings_example.c similarity index 100% rename from examples/core/easings_example.c rename to examples/others/easings_example.c