81 lines
1.6 KiB
JavaScript
81 lines
1.6 KiB
JavaScript
"use strict"
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var ease = require('./easing.js').ease
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var resolution = 25
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function Anim() {
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this.fx_stack = []
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this.interval = null
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}
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Anim.prototype.add = function(to, duration, options) {
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var options = options || {}
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var duration = duration || resolution
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options.easing = options.easing || 'linear';
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this.fx_stack.push({'to': to, 'duration': duration, 'options': options})
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return this
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}
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Anim.prototype.delay = function(duration) {
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return this.add({}, duration)
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}
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Anim.prototype.stop = function () {
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if(this.interval) {
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clearInterval(this.interval)
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}
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this.fx_stack = []
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}
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Anim.prototype.run = function(universe, onFinish) {
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var config = {}
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var ticks = 0
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var duration = 0
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var animationStep
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var fx_stack = this.fx_stack;
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var ani_setup = function() {
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animationStep = fx_stack.shift()
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ticks = 0
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duration = animationStep.duration
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config = {}
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for (var k in animationStep.to) {
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config[k] = {
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'start': universe.get(k),
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'end': animationStep.to[k],
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'options': animationStep.options
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}
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}
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}
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var ani_step = function() {
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var newValues = {}
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for (var k in config) {
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var entry = config[k]
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var easing = ease[entry.options.easing]
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newValues[k] = Math.round(entry.start + easing(ticks, 0, 1, duration) * (entry.end - entry.start))
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}
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ticks = ticks + resolution
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universe.update(newValues)
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if (ticks > duration) {
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if (fx_stack.length > 0) {
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ani_setup()
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} else {
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clearInterval(iid)
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if(onFinish) {
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onFinish()
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}
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}
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}
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}
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ani_setup()
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var iid = this.interval = setInterval(ani_step, resolution)
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return this
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}
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module.exports = Anim
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