Mercurial > projects > dynamin
annotate dynamin/core/animated_value.d @ 103:73060bc3f004
Change license to Boost 1.0 and MPL 2.0.
| author | Jordan Miner <jminer7@gmail.com> |
|---|---|
| date | Tue, 15 May 2012 22:06:02 -0500 |
| parents | aa4efef0f0b1 |
| children |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* | |
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103
73060bc3f004
Change license to Boost 1.0 and MPL 2.0.
Jordan Miner <jminer7@gmail.com>
parents:
0
diff
changeset
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3 * Copyright Jordan Miner |
| 0 | 4 * |
|
103
73060bc3f004
Change license to Boost 1.0 and MPL 2.0.
Jordan Miner <jminer7@gmail.com>
parents:
0
diff
changeset
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5 * Distributed under the Boost Software License, Version 1.0. |
|
73060bc3f004
Change license to Boost 1.0 and MPL 2.0.
Jordan Miner <jminer7@gmail.com>
parents:
0
diff
changeset
|
6 * (See accompanying file BOOST_LICENSE.txt or copy at |
|
73060bc3f004
Change license to Boost 1.0 and MPL 2.0.
Jordan Miner <jminer7@gmail.com>
parents:
0
diff
changeset
|
7 * http://www.boost.org/LICENSE_1_0.txt) |
| 0 | 8 * |
| 9 */ | |
| 10 | |
| 11 module dynamin.core.animated_value; | |
| 12 | |
| 13 /// AnimatedValue!(int) | |
| 14 alias AnimatedValue!(int) AnimatedInt; | |
| 15 /// AnimatedValue!(float) | |
| 16 alias AnimatedValue!(float) AnimatedFloat; | |
| 17 /// AnimatedValue!(double) | |
| 18 alias AnimatedValue!(double) AnimatedDouble; | |
| 19 /// AnimatedValue!(real) | |
| 20 alias AnimatedValue!(real) AnimatedReal; | |
| 21 | |
| 22 // TODO: change to a struct? | |
| 23 /** | |
| 24 * Holds a value that changes over time. The value can be changed by calling | |
| 25 * animate(), then calling advance() with an amount of time. | |
| 26 * Example: | |
| 27 * ----- | |
| 28 * AnimatedInt x = new AnimatedInt; | |
| 29 * x.set(100); /+ start the animation at 100 +/ | |
| 30 * x.animate(900, 1000); /+ animate to 900, over a period of 1000 ms +/ | |
| 31 * x.advance(250); /+ advance 250 ms, one-fourth of the way to 1000 +/ | |
| 32 * x.get(); /+ returns 300, one-fourth of the way between 100 and 900 +/ | |
| 33 * x.advance(2000); /+ advance past the end of the animation +/ | |
| 34 * x.get(); /+ returns 900 +/ | |
| 35 * ----- | |
| 36 */ | |
| 37 class AnimatedValue(T) { | |
| 38 T _value = 0; | |
| 39 T _startValue, _endValue; | |
| 40 int _elapsed, _duration; | |
| 41 bool _animating; | |
| 42 T get() { | |
| 43 return _value; | |
| 44 } | |
| 45 T end() { | |
| 46 return _endValue; | |
| 47 } | |
| 48 AnimatedValue set(T newVal) { | |
| 49 _value = newVal; | |
| 50 _endValue = _value; | |
| 51 _animating = false; | |
| 52 return this; | |
| 53 } | |
| 54 void animate(T endVal, int dur) { | |
| 55 _animating = true; | |
| 56 _elapsed = 0; | |
| 57 _duration = dur; | |
| 58 _startValue = _value; | |
| 59 _endValue = endVal; | |
| 60 } | |
| 61 bool animating() { return _animating; } | |
| 62 void advance(int time) { | |
| 63 _elapsed += time; | |
| 64 if(!_animating) | |
| 65 return; | |
| 66 if(_elapsed > _duration) | |
| 67 set(_endValue); | |
| 68 else | |
| 69 _value = _startValue+(_endValue-_startValue)*_elapsed/_duration; | |
| 70 } | |
| 71 int elapsed() { | |
| 72 return _elapsed; | |
| 73 } | |
| 74 int duration() { | |
| 75 return _duration; | |
| 76 } | |
| 77 } |