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3904801c31
origin. Yes.. shame on me, i had even imported their non unix line endings :) Will make them BCitizens soon. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33890 a95241bf-73f2-0310-859d-f6bbb57e9c96
62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
/*
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* Copyright 2008, Haiku Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Alexandre Deckner <alex@zappotek.com>
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*/
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// Some math utils, useful for animation
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#include "MathUtils.h"
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#include <math.h>
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float
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MathUtils::EaseInOutCubic(float time, float start, float distance,
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float duration)
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{
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time /= duration / 2.0;
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if (time < 1.0)
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return distance / 2.0 * time * time * time + start;
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time -= 2.0;
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return distance / 2.0 * (time * time * time + 2.0) + start;
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}
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float
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MathUtils::EaseInOutQuart(float time, float start, float distance,
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float duration)
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{
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time /= duration / 2;
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if (time < 1)
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return distance / 2 * time * time * time * time + start;
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time -= 2;
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return -distance / 2 * (time * time * time * time - 2) + start;
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}
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float
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MathUtils::EaseInOutQuint(float time, float start, float distance,
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float duration)
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{
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time /= duration / 2;
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if (time < 1)
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return distance / 2 * time * time * time * time * time + start;
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time -= 2;
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return distance / 2 *(time * time * time * time * time + 2) + start;
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}
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float
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MathUtils::EaseInOutSine(float time, float start, float distance,
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float duration)
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{
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return -distance / 2 * (cos(3.14159 * time / distance) - 1) + start;
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}
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