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1 // | 1 // |
2 // Copyright 2014 Google Inc. All rights reserved. | 2 // Copyright 2014 Google Inc. All rights reserved. |
3 // | 3 // |
4 // Use of this source code is governed by a BSD-style | 4 // Use of this source code is governed by a BSD-style |
5 // license that can be found in the LICENSE file or at | 5 // license that can be found in the LICENSE file or at |
6 // https://developers.google.com/open-source/licenses/bsd | 6 // https://developers.google.com/open-source/licenses/bsd |
7 // | 7 // |
8 | 8 |
9 part of charted.core.interpolators; | 9 part of charted.core.interpolators; |
10 | 10 |
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25 const String EASE_MODE_OUT_IN = 'out-in'; | 25 const String EASE_MODE_OUT_IN = 'out-in'; |
26 | 26 |
27 /// [EasingFunction] manipulates progression of an animation. The returned | 27 /// [EasingFunction] manipulates progression of an animation. The returned |
28 /// value is passed to an [Interpolator] to generate intermediate state. | 28 /// value is passed to an [Interpolator] to generate intermediate state. |
29 typedef num EasingFunction(num t); | 29 typedef num EasingFunction(num t); |
30 | 30 |
31 /// Alters behavior of the [EasingFunction]. Takes [fn] and returns an | 31 /// Alters behavior of the [EasingFunction]. Takes [fn] and returns an |
32 /// altered [EasingFunction]. | 32 /// altered [EasingFunction]. |
33 typedef EasingFunction EasingModeFunction(EasingFunction fn); | 33 typedef EasingFunction EasingModeFunction(EasingFunction fn); |
34 | 34 |
35 /// Creates an easing function based on type and mode. | |
36 EasingFunction easingFunctionByName(String type, | |
37 [String mode = EASE_MODE_IN, List params]) { | |
38 const Map easingTypes = const { | |
39 EASE_TYPE_LINEAR: identityFunction, | |
40 EASE_TYPE_POLY: easePoly, | |
41 EASE_TYPE_QUAD: easeQuad, | |
42 EASE_TYPE_CUBIC: easeCubic, | |
43 EASE_TYPE_SIN: easeSin, | |
44 EASE_TYPE_EXP: easeExp, | |
45 EASE_TYPE_CIRCLE: easeCircle, | |
46 EASE_TYPE_ELASTIC: easeElastic, | |
47 EASE_TYPE_BACK: easeBack, | |
48 EASE_TYPE_BOUNCE: easeBounce | |
49 }; | |
50 | |
51 const Map easingModes = const { | |
52 EASE_MODE_IN: identityFunction, | |
53 EASE_MODE_OUT: reverseEasingFn, | |
54 EASE_MODE_IN_OUT: reflectEasingFn, | |
55 EASE_MODE_OUT_IN: reflectReverseEasingFn | |
56 }; | |
57 | |
58 const Map customEasingFunctions = const { | |
59 '$EASE_TYPE_CUBIC-$EASE_MODE_IN_OUT': easeCubicInOut | |
60 }; | |
61 | |
62 assert(easingTypes.containsKey(type)); | |
63 assert(easingModes.containsKey(mode)); | |
64 | |
65 EasingFunction fn; | |
66 if (customEasingFunctions.containsKey('$type-$mode')) { | |
67 fn = Function.apply(customEasingFunctions['$type-$mode'], params); | |
68 } else { | |
69 fn = Function.apply(easingTypes[type], params); | |
70 fn = easingModes[mode](fn); | |
71 } | |
72 return clampEasingFn(fn); | |
73 } | |
74 | |
75 /// Clamps transition progress to stay between 0.0 and 1.0 | 35 /// Clamps transition progress to stay between 0.0 and 1.0 |
76 EasingFunction clampEasingFn(EasingFunction f) => | 36 EasingFunction clampEasingFn(EasingFunction f) => |
77 (t) => t <= 0 ? 0 : t >= 1 ? 1 : f(t); | 37 (t) => t <= 0 ? 0 : t >= 1 ? 1 : f(t); |
78 | 38 |
79 // | 39 // |
80 // Implementation of easing modes. | 40 // Implementation of easing modes. |
81 // | 41 // |
82 | 42 |
83 EasingFunction reverseEasingFn(EasingFunction f) => (t) => 1 - f(1 - t); | 43 EasingFunction reverseEasingFn(EasingFunction f) => (t) => 1 - f(1 - t); |
84 | 44 |
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119 | 79 |
120 EasingFunction easeCircle() => (num t) => 1 - math.sqrt(1 - t * t); | 80 EasingFunction easeCircle() => (num t) => 1 - math.sqrt(1 - t * t); |
121 | 81 |
122 EasingFunction easeBounce() => (num t) => t < 1 / 2.75 | 82 EasingFunction easeBounce() => (num t) => t < 1 / 2.75 |
123 ? 7.5625 * t * t | 83 ? 7.5625 * t * t |
124 : t < 2 / 2.75 | 84 : t < 2 / 2.75 |
125 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75 | 85 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75 |
126 : t < 2.5 / 2.75 | 86 : t < 2.5 / 2.75 |
127 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375 | 87 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375 |
128 : 7.5625 * (t -= 2.625 / 2.75) * t + .984375; | 88 : 7.5625 * (t -= 2.625 / 2.75) * t + .984375; |
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