45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/**
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* Copyright (c) 2021 Dominic Masters
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*
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* This software is released under the MIT License.
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* https://opensource.org/licenses/MIT
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*/
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#pragma once
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/**
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* Returns the ease time for a given real time duration span.
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* @param start At what point in time the animation started
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* @param current The current point in time the animation is at.
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* @param duration The total duration on the animation.
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* @returns The easing time (0-1 time) that the animation is at.
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*/
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#define easeTimeToEase(start, current, duration) ((current-start)/duration)
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/**
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* Animation tool for converting 0-1 space into a 0-0.5 back to zero space. This
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* is intended to make a "Forward then backwards" effect for animation. This
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* method will not scale t.
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* @param t Time in space to back and fourth on between 0 and 1.
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* @returns Forward and backwards time. 0 to 0.5 are as such, 0.5 to 1 are from
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* 0.5 to 0.
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*/
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#define easeTimeToForwardAndBackward(t) (t < 0.5 ? t : 1 - t)
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// Easing Functions, most were sourced from https://gist.github.com/gre/1650294
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#define easeLinear(t) t
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#define easeInQuad(t) (t*t)
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#define easeOutQuad(t) (t*(2-t))
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#define easeInOutQuad(t) (t < .5 ? 2*t*t : -1+(4-2*t)*t)
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#define easeInCubic(t) (t*t*t)
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#define easeOutCubic(t) ((t-1)*(t-1)*(t-1)+1)
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#define easeInOutCubic(t) (t < .5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1)
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#define easeInQuart(t) (t*t*t*t)
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#define easeOutQuart(t) (1 - (t-1)*(t-1)*(t-1)*(t-1))
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#define easeInOutQuart(t) (t < .5 ? 8*t*t*t*t : 1-8*(t-1)*(t-1)*(t-1)*(t-1))
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#define easeInQuint(t) (t*t*t*t*t)
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#define easeOutQuint(t) (1 + (t-1)*(t-1)*(t-1)*(t-1)*(t-1))
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#define easeInOutQuint(t) (t<.5 ? 16*t*t*t*t*t : 1+16*(t-1)*(t-1)*(t-1)*(t-1)*(t-1)) |