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1 // Written in the D programming language
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2 // www.digitalmars.com/d/
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3
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4 /*
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5 * The contents of this file are subject to the Mozilla Public License Version
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6 * 1.1 (the "License"); you may not use this file except in compliance with
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7 * the License. You may obtain a copy of the License at
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8 * http://www.mozilla.org/MPL/
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9 *
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10 * Software distributed under the License is distributed on an "AS IS" basis,
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11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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12 * for the specific language governing rights and limitations under the
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13 * License.
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14 *
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15 * The Original Code is the Dynamin library.
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16 *
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17 * The Initial Developer of the Original Code is Jordan Miner.
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18 * Portions created by the Initial Developer are Copyright (C) 2008
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19 * the Initial Developer. All Rights Reserved.
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20 *
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21 * Contributor(s):
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22 * Jordan Miner <jminer7@gmail.com>
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23 *
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24 */
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25
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26 module dynamin.core.animated_value;
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27
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28 /// AnimatedValue!(int)
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29 alias AnimatedValue!(int) AnimatedInt;
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30 /// AnimatedValue!(float)
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31 alias AnimatedValue!(float) AnimatedFloat;
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32 /// AnimatedValue!(double)
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33 alias AnimatedValue!(double) AnimatedDouble;
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34 /// AnimatedValue!(real)
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35 alias AnimatedValue!(real) AnimatedReal;
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36
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37 // TODO: change to a struct?
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38 /**
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39 * Holds a value that changes over time. The value can be changed by calling
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40 * animate(), then calling advance() with an amount of time.
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41 * Example:
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42 * -----
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43 * AnimatedInt x = new AnimatedInt;
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44 * x.set(100); /+ start the animation at 100 +/
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45 * x.animate(900, 1000); /+ animate to 900, over a period of 1000 ms +/
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46 * x.advance(250); /+ advance 250 ms, one-fourth of the way to 1000 +/
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47 * x.get(); /+ returns 300, one-fourth of the way between 100 and 900 +/
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48 * x.advance(2000); /+ advance past the end of the animation +/
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49 * x.get(); /+ returns 900 +/
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50 * -----
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51 */
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52 class AnimatedValue(T) {
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53 T _value = 0;
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54 T _startValue, _endValue;
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55 int _elapsed, _duration;
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56 bool _animating;
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57 T get() {
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58 return _value;
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59 }
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60 T end() {
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61 return _endValue;
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62 }
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63 AnimatedValue set(T newVal) {
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64 _value = newVal;
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65 _endValue = _value;
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66 _animating = false;
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67 return this;
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68 }
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69 void animate(T endVal, int dur) {
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70 _animating = true;
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71 _elapsed = 0;
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72 _duration = dur;
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73 _startValue = _value;
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74 _endValue = endVal;
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75 }
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76 bool animating() { return _animating; }
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77 void advance(int time) {
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78 _elapsed += time;
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79 if(!_animating)
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80 return;
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81 if(_elapsed > _duration)
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82 set(_endValue);
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83 else
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84 _value = _startValue+(_endValue-_startValue)*_elapsed/_duration;
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85 }
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86 int elapsed() {
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87 return _elapsed;
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88 }
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89 int duration() {
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90 return _duration;
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91 }
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92 }
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