|
| 1 | +var Class = require('../../utils/Class'); |
| 2 | +var FloatBetween = require('../../math/FloatBetween'); |
| 3 | +var GetEaseFunction = require('../../tweens/builder/GetEaseFunction'); |
| 4 | +var GetFastValue = require('../../utils/object/GetFastValue'); |
| 5 | +var Wrap = require('../../math/Wrap'); |
| 6 | + |
| 7 | +var EmitterOp = new Class({ |
| 8 | + |
| 9 | + initialize: |
| 10 | + |
| 11 | + function EmitterOp (config, key, defaultValue) |
| 12 | + { |
| 13 | + this.propertyKey = key; |
| 14 | + this.propertyValue = GetFastValue(config, key, defaultValue); |
| 15 | + this.defaultValue = defaultValue; |
| 16 | + |
| 17 | + this.steps = 0; |
| 18 | + this.counter = 0; |
| 19 | + |
| 20 | + this.start = 0; |
| 21 | + this.end = 0; |
| 22 | + this.ease; |
| 23 | + |
| 24 | + this.onEmit = this.defaultEmit; |
| 25 | + this.onUpdate = this.defaultUpdate; |
| 26 | + |
| 27 | + this.setMethods(); |
| 28 | + }, |
| 29 | + |
| 30 | + onChange: function (value) |
| 31 | + { |
| 32 | + this.propertyValue = value; |
| 33 | + |
| 34 | + return this.setMethods(); |
| 35 | + }, |
| 36 | + |
| 37 | + setMethods: function () |
| 38 | + { |
| 39 | + var value = this.propertyValue; |
| 40 | + |
| 41 | + var t = typeof(value); |
| 42 | + |
| 43 | + if (t === 'number') |
| 44 | + { |
| 45 | + // Explicit static value: |
| 46 | + // x: 400 |
| 47 | + |
| 48 | + this.onEmit = this.staticValueEmit; |
| 49 | + this.onUpdate = this.staticValueUpdate; |
| 50 | + } |
| 51 | + else if (Array.isArray(value)) |
| 52 | + { |
| 53 | + // Picks a random element from the array: |
| 54 | + // x: [ 100, 200, 300, 400 ] |
| 55 | + |
| 56 | + this.onEmit = this.randomStaticValueEmit; |
| 57 | + } |
| 58 | + else if (t === 'function') |
| 59 | + { |
| 60 | + // The same as setting just the onUpdate function and no onEmit |
| 61 | + // Custom callback, must return a value: |
| 62 | + |
| 63 | + /* |
| 64 | + x: function (particle, key, t, value) |
| 65 | + { |
| 66 | + return value + 50; |
| 67 | + } |
| 68 | + */ |
| 69 | + |
| 70 | + this.onUpdate = value; |
| 71 | + } |
| 72 | + else if (t === 'object' && (this.has(value, 'random') || this.hasBoth(value, 'start', 'end') || this.hasBoth(value, 'min', 'max'))) |
| 73 | + { |
| 74 | + this.start = (this.has(value, 'start')) ? value.start : value.min; |
| 75 | + this.end = (this.has(value, 'end')) ? value.end : value.max; |
| 76 | + |
| 77 | + var isRandom = (this.hasBoth(value, 'min', 'max') || this.has(value, 'random')); |
| 78 | + |
| 79 | + // A random starting value (using 'min | max' instead of 'start | end' automatically implies a random value) |
| 80 | + |
| 81 | + // x: { start: 100, end: 400, random: true } OR { min: 100, max: 400 } OR { random: [ 100, 400 ] } |
| 82 | + |
| 83 | + if (isRandom) |
| 84 | + { |
| 85 | + var rnd = value.random; |
| 86 | + |
| 87 | + // x: { random: [ 100, 400 ] } = the same as doing: x: { start: 100, end: 400, random: true } |
| 88 | + if (Array.isArray(rnd)) |
| 89 | + { |
| 90 | + this.start = rnd[0]; |
| 91 | + this.end = rnd[1]; |
| 92 | + } |
| 93 | + |
| 94 | + this.onEmit = this.randomRangedValueEmit; |
| 95 | + } |
| 96 | + |
| 97 | + if (this.has(value, 'steps')) |
| 98 | + { |
| 99 | + // A stepped (per emit) range |
| 100 | + |
| 101 | + // x: { start: 100, end: 400, steps: 64 } |
| 102 | + |
| 103 | + // Increments a value stored in the emitter |
| 104 | + |
| 105 | + this.steps = value.steps; |
| 106 | + this.counter = this.start; |
| 107 | + |
| 108 | + this.onEmit = this.steppedEmit; |
| 109 | + } |
| 110 | + else |
| 111 | + { |
| 112 | + // An eased range (defaults to Linear if not specified) |
| 113 | + |
| 114 | + // x: { start: 100, end: 400, [ ease: 'Linear' ] } |
| 115 | + |
| 116 | + var easeType = (this.has(value, 'ease')) ? value.ease : 'Linear'; |
| 117 | + |
| 118 | + this.ease = GetEaseFunction(easeType); |
| 119 | + |
| 120 | + if (!isRandom) |
| 121 | + { |
| 122 | + this.onEmit = this.easedValueEmit; |
| 123 | + } |
| 124 | + |
| 125 | + this.onUpdate = this.easeValueUpdate; |
| 126 | + } |
| 127 | + } |
| 128 | + else if (t === 'object' && this.hasEither(value, 'onEmit', 'onUpdate')) |
| 129 | + { |
| 130 | + // Custom onEmit and onUpdate callbacks |
| 131 | + |
| 132 | + /* |
| 133 | + x: { |
| 134 | + // Called at the start of the particles life, when it is being created |
| 135 | + onEmit: function (particle, key, t, value) |
| 136 | + { |
| 137 | + return value; |
| 138 | + }, |
| 139 | +
|
| 140 | + // Called during the particles life on each update |
| 141 | + onUpdate: function (particle, key, t, value) |
| 142 | + { |
| 143 | + return value; |
| 144 | + } |
| 145 | + } |
| 146 | + */ |
| 147 | + |
| 148 | + if (this.has(value, 'onEmit')) |
| 149 | + { |
| 150 | + this.onEmit = value.onEmit; |
| 151 | + } |
| 152 | + |
| 153 | + if (this.has(value, 'onUpdate')) |
| 154 | + { |
| 155 | + this.onUpdate = value.onUpdate; |
| 156 | + } |
| 157 | + } |
| 158 | + |
| 159 | + return this; |
| 160 | + }, |
| 161 | + |
| 162 | + has: function (object, key) |
| 163 | + { |
| 164 | + return (object.hasOwnProperty(key)); |
| 165 | + }, |
| 166 | + |
| 167 | + hasBoth: function (object, key1, key2) |
| 168 | + { |
| 169 | + return (object.hasOwnProperty(key1) && object.hasOwnProperty(key2)); |
| 170 | + }, |
| 171 | + |
| 172 | + hasEither: function (object, key1, key2) |
| 173 | + { |
| 174 | + return (object.hasOwnProperty(key1) || object.hasOwnProperty(key2)); |
| 175 | + }, |
| 176 | + |
| 177 | + // The returned value sets what the property will be at the START of the particles life, on emit |
| 178 | + defaultEmit: function (particle, key, value) |
| 179 | + { |
| 180 | + return value; |
| 181 | + }, |
| 182 | + |
| 183 | + // The returned value updates the property for the duration of the particles life |
| 184 | + defaultUpdate: function (particle, key, t, value) |
| 185 | + { |
| 186 | + return value; |
| 187 | + }, |
| 188 | + |
| 189 | + staticValueEmit: function () |
| 190 | + { |
| 191 | + return this.propertyValue; |
| 192 | + }, |
| 193 | + |
| 194 | + staticValueUpdate: function () |
| 195 | + { |
| 196 | + return this.propertyValue; |
| 197 | + }, |
| 198 | + |
| 199 | + randomStaticValueEmit: function () |
| 200 | + { |
| 201 | + var randomIndex = Math.floor(Math.random() * this.propertyValue.length); |
| 202 | + |
| 203 | + return this.propertyValue[randomIndex]; |
| 204 | + }, |
| 205 | + |
| 206 | + randomRangedValueEmit: function (particle, key) |
| 207 | + { |
| 208 | + var value = FloatBetween(this.start, this.end); |
| 209 | + |
| 210 | + var data = particle.data[key]; |
| 211 | + |
| 212 | + if (data) |
| 213 | + { |
| 214 | + data.min = value; |
| 215 | + } |
| 216 | + |
| 217 | + return value; |
| 218 | + }, |
| 219 | + |
| 220 | + steppedEmit: function () |
| 221 | + { |
| 222 | + var next = this.counter + ((this.end - this.start) / this.steps); |
| 223 | + |
| 224 | + this.counter = Wrap(next, this.start, this.end); |
| 225 | + |
| 226 | + return this.counter; |
| 227 | + }, |
| 228 | + |
| 229 | + easedValueEmit: function (particle, key) |
| 230 | + { |
| 231 | + var data = particle.data[key]; |
| 232 | + |
| 233 | + data.min = this.start; |
| 234 | + data.max = this.end; |
| 235 | + |
| 236 | + return this.start; |
| 237 | + }, |
| 238 | + |
| 239 | + easeValueUpdate: function (particle, key, t, value) |
| 240 | + { |
| 241 | + var data = particle.data[key]; |
| 242 | + |
| 243 | + return (data.max - data.min) * this.ease(t) + data.min; |
| 244 | + } |
| 245 | + |
| 246 | +}); |
| 247 | + |
| 248 | +module.exports = EmitterOp; |
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