1/*
2 * Copyright 2008, Haiku Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 *
5 * Authors:
6 * 		Alexandre Deckner <alex@zappotek.com>
7 */
8
9// Some math utils, useful for animation
10
11
12#include "MathUtils.h"
13
14#include <math.h>
15
16
17float
18MathUtils::EaseInOutCubic(float time, float start, float distance,
19	float duration)
20{
21	time /= duration  / 2.0;
22	if (time < 1.0)
23		return distance / 2.0 * time * time * time + start;
24	time -= 2.0;
25	return distance / 2.0 * (time * time * time + 2.0) + start;
26}
27
28
29float
30MathUtils::EaseInOutQuart(float time, float start, float distance,
31	float duration)
32{
33	time /= duration  / 2;
34
35	if (time < 1)
36		return distance / 2 * time * time * time * time + start;
37
38	time -= 2;
39
40	return -distance / 2 * (time * time * time * time - 2) + start;
41}
42
43
44float
45MathUtils::EaseInOutQuint(float time, float start, float distance,
46	float duration)
47{
48	time /= duration  / 2;
49	if (time < 1)
50		return distance / 2 * time * time * time * time * time + start;
51	time -= 2;
52	return distance / 2 *(time * time * time * time * time + 2) + start;
53}
54
55
56float
57MathUtils::EaseInOutSine(float time, float start, float distance,
58	float duration)
59{
60	return -distance / 2 * (cos(3.14159 * time / distance) - 1) + start;
61}
62