-
Notifications
You must be signed in to change notification settings - Fork 3
/
Copy pathapp.ts
223 lines (188 loc) · 17 KB
/
app.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
// Utility Functions
// GetRandomFloat returns a random floating point number
// in a given range
function GetRandomFloat(min: number, max: number): number {
return Math.random() * (max - min) + min
}
// GetRandomInt returns a random integer
// in a given range
function GetRandomInt(min: number, max: number): number {
return Math.floor(GetRandomFloat(min, max))
}
// FromPolar returns the catesian co-ordinates for a
// given polar co-ordinate
function FromPolar(v: number, theta: number) {
return [v * Math.cos(theta), v * Math.sin(theta)]
}
function ToLuma(r: number, g: number, b: number): number {
return 0.2126 * r + 0.7152 * g + 0.0722 * b
}
// Clamp makes sure the value stays in the range min,max
function Clamp(min: number, max: number, value: number): number {
return value > max ? max : (value < min ? min : value)
}
//////////////////////////////////////////////
// All objects including the simulation behaviour is described
// by this interface
interface ISimObject {
// Updates the state of the object
Update(imageData: ImageData): void
// Renders the object to the canvas
Draw(ctx: CanvasRenderingContext2D): void
}
// Particle Constants
const MaxParticleSize = 10
const MinParticleSize = 1
////////////////////////////////////
class Particle implements ISimObject {
x = 0; y = 0; // location of this particle
speed = 0; theta = 0 // describes the velocity
radius = MinParticleSize // size of the particle
ttl = 500 // how much time left to live
lifetime = 500 // how long this particle will live
alpha = 1.0
color = 'black'
constructor(private w: number, private h: number, private palette: string[]) {
this.reset()
}
reset() {
this.x = GetRandomFloat(0, this.w)
this.y = GetRandomFloat(0, this.h)
this.speed = GetRandomFloat(0, 3.0)
this.theta = GetRandomFloat(0, 2 * Math.PI)
this.radius = 0.0 // GetRandomFloat(MinParticleSize, 1.0)
this.lifetime = this.ttl = GetRandomInt(50, 100)
this.color = 'black'
if (GetRandomFloat(0, 1) > 0.1) {
this.color = this.palette[GetRandomInt(1, this.palette.length)]
}
this.ttl = this.lifetime = GetRandomInt(50, 100)
}
imageComplementLuma(imageData: ImageData): number {
const p = Math.floor(this.x) + Math.floor(this.y) * imageData.width
// ImageData contains RGBA values
const i = Math.floor(p * 4)
const r = imageData.data[i + 0]
const g = imageData.data[i + 1]
const b = imageData.data[i + 2]
const luma = ToLuma(r, g, b) // 0 -> 255
// luma is higher for lighter pixel
const ln = 1 - luma / 255.0 // complement; higher ln means darker
return ln
}
Update(imageData: ImageData) {
const ln = this.imageComplementLuma(imageData)
const lt = (this.lifetime - this.ttl) / this.lifetime
this.alpha = lt
// compute the delta change
let dRadius = GetRandomFloat(-MaxParticleSize / 5, MaxParticleSize / 5)
const dSpeed = GetRandomFloat(-0.01, 0.01)
const dTheta = GetRandomFloat(-Math.PI / 12, Math.PI / 12)
// compute new values
this.speed += dSpeed
this.theta += dTheta
const [dx, dy] = FromPolar(this.speed, this.theta)
this.x += dx
this.y += dy
this.x = Clamp(0, this.w, this.x)
this.y = Clamp(0, this.h, this.y)
this.radius += dRadius
this.radius = Clamp(MinParticleSize, MaxParticleSize, this.radius) * ln
if (this.speed < 1.0) {
this.radius = 0.1
}
// manage particle lifetime
this.ttl += -1
if (this.ttl == 0) {
this.reset()
}
}
Draw(ctx: CanvasRenderingContext2D) {
ctx.save()
this.experiment1(ctx)
ctx.restore()
}
experiment1(ctx: CanvasRenderingContext2D) {
ctx.fillStyle = this.color
ctx.globalAlpha = this.alpha
let circle = new Path2D()
circle.arc(this.x, this.y, this.radius, 0, 2 * Math.PI)
ctx.fill(circle)
}
}
// Simulation Constants
const ParticleCount = 200
const ColorPalettes = [["#69D2E7", "#A7DBD8", "#E0E4CC", "#F38630", "#FA6900"], ["#FE4365", "#FC9D9A", "#F9CDAD", "#C8C8A9", "#83AF9B"], ["#ECD078", "#D95B43", "#C02942", "#542437", "#53777A"], ["#556270", "#4ECDC4", "#C7F464", "#FF6B6B", "#C44D58"], ["#774F38", "#E08E79", "#F1D4AF", "#ECE5CE", "#C5E0DC"], ["#E8DDCB", "#CDB380", "#036564", "#033649", "#031634"], ["#490A3D", "#BD1550", "#E97F02", "#F8CA00", "#8A9B0F"], ["#594F4F", "#547980", "#45ADA8", "#9DE0AD", "#E5FCC2"], ["#00A0B0", "#6A4A3C", "#CC333F", "#EB6841", "#EDC951"], ["#E94E77", "#D68189", "#C6A49A", "#C6E5D9", "#F4EAD5"], ["#D9CEB2", "#948C75", "#D5DED9", "#7A6A53", "#99B2B7"], ["#FFFFFF", "#CBE86B", "#F2E9E1", "#1C140D", "#CBE86B"], ["#EFFFCD", "#DCE9BE", "#555152", "#2E2633", "#99173C"], ["#3FB8AF", "#7FC7AF", "#DAD8A7", "#FF9E9D", "#FF3D7F"], ["#343838", "#005F6B", "#008C9E", "#00B4CC", "#00DFFC"], ["#413E4A", "#73626E", "#B38184", "#F0B49E", "#F7E4BE"], ["#99B898", "#FECEA8", "#FF847C", "#E84A5F", "#2A363B"], ["#FF4E50", "#FC913A", "#F9D423", "#EDE574", "#E1F5C4"], ["#554236", "#F77825", "#D3CE3D", "#F1EFA5", "#60B99A"], ["#351330", "#424254", "#64908A", "#E8CAA4", "#CC2A41"], ["#00A8C6", "#40C0CB", "#F9F2E7", "#AEE239", "#8FBE00"], ["#FF4242", "#F4FAD2", "#D4EE5E", "#E1EDB9", "#F0F2EB"], ["#655643", "#80BCA3", "#F6F7BD", "#E6AC27", "#BF4D28"], ["#8C2318", "#5E8C6A", "#88A65E", "#BFB35A", "#F2C45A"], ["#FAD089", "#FF9C5B", "#F5634A", "#ED303C", "#3B8183"], ["#BCBDAC", "#CFBE27", "#F27435", "#F02475", "#3B2D38"], ["#D1E751", "#FFFFFF", "#000000", "#4DBCE9", "#26ADE4"], ["#FF9900", "#424242", "#E9E9E9", "#BCBCBC", "#3299BB"], ["#5D4157", "#838689", "#A8CABA", "#CAD7B2", "#EBE3AA"], ["#5E412F", "#FCEBB6", "#78C0A8", "#F07818", "#F0A830"], ["#EEE6AB", "#C5BC8E", "#696758", "#45484B", "#36393B"], ["#1B676B", "#519548", "#88C425", "#BEF202", "#EAFDE6"], ["#F8B195", "#F67280", "#C06C84", "#6C5B7B", "#355C7D"], ["#452632", "#91204D", "#E4844A", "#E8BF56", "#E2F7CE"], ["#F04155", "#FF823A", "#F2F26F", "#FFF7BD", "#95CFB7"], ["#F0D8A8", "#3D1C00", "#86B8B1", "#F2D694", "#FA2A00"], ["#2A044A", "#0B2E59", "#0D6759", "#7AB317", "#A0C55F"], ["#67917A", "#170409", "#B8AF03", "#CCBF82", "#E33258"], ["#B9D7D9", "#668284", "#2A2829", "#493736", "#7B3B3B"], ["#BBBB88", "#CCC68D", "#EEDD99", "#EEC290", "#EEAA88"], ["#A3A948", "#EDB92E", "#F85931", "#CE1836", "#009989"], ["#E8D5B7", "#0E2430", "#FC3A51", "#F5B349", "#E8D5B9"], ["#B3CC57", "#ECF081", "#FFBE40", "#EF746F", "#AB3E5B"], ["#AB526B", "#BCA297", "#C5CEAE", "#F0E2A4", "#F4EBC3"], ["#607848", "#789048", "#C0D860", "#F0F0D8", "#604848"], ["#515151", "#FFFFFF", "#00B4FF", "#EEEEEE"], ["#3E4147", "#FFFEDF", "#DFBA69", "#5A2E2E", "#2A2C31"], ["#300030", "#480048", "#601848", "#C04848", "#F07241"], ["#1C2130", "#028F76", "#B3E099", "#FFEAAD", "#D14334"], ["#A8E6CE", "#DCEDC2", "#FFD3B5", "#FFAAA6", "#FF8C94"], ["#EDEBE6", "#D6E1C7", "#94C7B6", "#403B33", "#D3643B"], ["#FDF1CC", "#C6D6B8", "#987F69", "#E3AD40", "#FCD036"], ["#AAB3AB", "#C4CBB7", "#EBEFC9", "#EEE0B7", "#E8CAAF"], ["#CC0C39", "#E6781E", "#C8CF02", "#F8FCC1", "#1693A7"], ["#3A111C", "#574951", "#83988E", "#BCDEA5", "#E6F9BC"], ["#FC354C", "#29221F", "#13747D", "#0ABFBC", "#FCF7C5"], ["#B9D3B0", "#81BDA4", "#B28774", "#F88F79", "#F6AA93"], ["#5E3929", "#CD8C52", "#B7D1A3", "#DEE8BE", "#FCF7D3"], ["#230F2B", "#F21D41", "#EBEBBC", "#BCE3C5", "#82B3AE"], ["#5C323E", "#A82743", "#E15E32", "#C0D23E", "#E5F04C"], ["#4E395D", "#827085", "#8EBE94", "#CCFC8E", "#DC5B3E"], ["#DAD6CA", "#1BB0CE", "#4F8699", "#6A5E72", "#563444"], ["#C2412D", "#D1AA34", "#A7A844", "#A46583", "#5A1E4A"], ["#D1313D", "#E5625C", "#F9BF76", "#8EB2C5", "#615375"], ["#9D7E79", "#CCAC95", "#9A947C", "#748B83", "#5B756C"], ["#1C0113", "#6B0103", "#A30006", "#C21A01", "#F03C02"], ["#8DCCAD", "#988864", "#FEA6A2", "#F9D6AC", "#FFE9AF"], ["#CFFFDD", "#B4DEC1", "#5C5863", "#A85163", "#FF1F4C"], ["#75616B", "#BFCFF7", "#DCE4F7", "#F8F3BF", "#D34017"], ["#382F32", "#FFEAF2", "#FCD9E5", "#FBC5D8", "#F1396D"], ["#B6D8C0", "#C8D9BF", "#DADABD", "#ECDBBC", "#FEDCBA"], ["#E3DFBA", "#C8D6BF", "#93CCC6", "#6CBDB5", "#1A1F1E"], ["#A7C5BD", "#E5DDCB", "#EB7B59", "#CF4647", "#524656"], ["#9DC9AC", "#FFFEC7", "#F56218", "#FF9D2E", "#919167"], ["#413D3D", "#040004", "#C8FF00", "#FA023C", "#4B000F"], ["#EDF6EE", "#D1C089", "#B3204D", "#412E28", "#151101"], ["#A8A7A7", "#CC527A", "#E8175D", "#474747", "#363636"], ["#7E5686", "#A5AAD9", "#E8F9A2", "#F8A13F", "#BA3C3D"], ["#FFEDBF", "#F7803C", "#F54828", "#2E0D23", "#F8E4C1"], ["#C1B398", "#605951", "#FBEEC2", "#61A6AB", "#ACCEC0"], ["#5E9FA3", "#DCD1B4", "#FAB87F", "#F87E7B", "#B05574"], ["#951F2B", "#F5F4D7", "#E0DFB1", "#A5A36C", "#535233"], ["#FFFBB7", "#A6F6AF", "#66B6AB", "#5B7C8D", "#4F2958"], ["#000000", "#9F111B", "#B11623", "#292C37", "#CCCCCC"], ["#9CDDC8", "#BFD8AD", "#DDD9AB", "#F7AF63", "#633D2E"], ["#EFF3CD", "#B2D5BA", "#61ADA0", "#248F8D", "#605063"], ["#84B295", "#ECCF8D", "#BB8138", "#AC2005", "#2C1507"], ["#FCFEF5", "#E9FFE1", "#CDCFB7", "#D6E6C3", "#FAFBE3"], ["#0CA5B0", "#4E3F30", "#FEFEEB", "#F8F4E4", "#A5B3AA"], ["#4D3B3B", "#DE6262", "#FFB88C", "#FFD0B3", "#F5E0D3"], ["#B5AC01", "#ECBA09", "#E86E1C", "#D41E45", "#1B1521"], ["#379F7A", "#78AE62", "#BBB749", "#E0FBAC", "#1F1C0D"], ["#FFE181", "#EEE9E5", "#FAD3B2", "#FFBA7F", "#FF9C97"], ["#4E4D4A", "#353432", "#94BA65", "#2790B0", "#2B4E72"], ["#A70267", "#F10C49", "#FB6B41", "#F6D86B", "#339194"], ["#30261C", "#403831", "#36544F", "#1F5F61", "#0B8185"], ["#2D2D29", "#215A6D", "#3CA2A2", "#92C7A3", "#DFECE6"], ["#F38A8A", "#55443D", "#A0CAB5", "#CDE9CA", "#F1EDD0"], ["#793A57", "#4D3339", "#8C873E", "#D1C5A5", "#A38A5F"], ["#11766D", "#410936", "#A40B54", "#E46F0A", "#F0B300"], ["#AAFF00", "#FFAA00", "#FF00AA", "#AA00FF", "#00AAFF"], ["#C75233", "#C78933", "#D6CEAA", "#79B5AC", "#5E2F46"], ["#F8EDD1", "#D88A8A", "#474843", "#9D9D93", "#C5CFC6"], ["#6DA67A", "#77B885", "#86C28B", "#859987", "#4A4857"], ["#1B325F", "#9CC4E4", "#E9F2F9", "#3A89C9", "#F26C4F"], ["#BED6C7", "#ADC0B4", "#8A7E66", "#A79B83", "#BBB2A1"], ["#046D8B", "#309292", "#2FB8AC", "#93A42A", "#ECBE13"], ["#82837E", "#94B053", "#BDEB07", "#BFFA37", "#E0E0E0"], ["#312736", "#D4838F", "#D6ABB1", "#D9D9D9", "#C4FFEB"], ["#E5EAA4", "#A8C4A2", "#69A5A4", "#616382", "#66245B"], ["#6DA67A", "#99A66D", "#A9BD68", "#B5CC6A", "#C0DE5D"], ["#395A4F", "#432330", "#853C43", "#F25C5E", "#FFA566"], ["#331327", "#991766", "#D90F5A", "#F34739", "#FF6E27"], ["#FDFFD9", "#FFF0B8", "#FFD6A3", "#FAAD8E", "#142F30"], ["#E21B5A", "#9E0C39", "#333333", "#FBFFE3", "#83A300"], ["#FBC599", "#CDBB93", "#9EAE8A", "#335650", "#F35F55"], ["#C7FCD7", "#D9D5A7", "#D9AB91", "#E6867A", "#ED4A6A"], ["#EC4401", "#CC9B25", "#13CD4A", "#7B6ED6", "#5E525C"], ["#BF496A", "#B39C82", "#B8C99D", "#F0D399", "#595151"], ["#FFEFD3", "#FFFEE4", "#D0ECEA", "#9FD6D2", "#8B7A5E"], ["#F1396D", "#FD6081", "#F3FFEB", "#ACC95F", "#8F9924"], ["#F6F6F6", "#E8E8E8", "#333333", "#990100", "#B90504"], ["#261C21", "#6E1E62", "#B0254F", "#DE4126", "#EB9605"], ["#E9E0D1", "#91A398", "#33605A", "#070001", "#68462B"], ["#F2E3C6", "#FFC6A5", "#E6324B", "#2B2B2B", "#353634"], ["#FFAB07", "#E9D558", "#72AD75", "#0E8D94", "#434D53"], ["#59B390", "#F0DDAA", "#E47C5D", "#E32D40", "#152B3C"], ["#FDE6BD", "#A1C5AB", "#F4DD51", "#D11E48", "#632F53"], ["#E4E4C5", "#B9D48B", "#8D2036", "#CE0A31", "#D3E4C5"], ["#512B52", "#635274", "#7BB0A8", "#A7DBAB", "#E4F5B1"], ["#805841", "#DCF7F3", "#FFFCDD", "#FFD8D8", "#F5A2A2"], ["#E65540", "#F8ECC2", "#65A8A6", "#79896D"], ["#CAFF42", "#EBF7F8", "#D0E0EB", "#88ABC2", "#49708A"], ["#595643", "#4E6B66", "#ED834E", "#EBCC6E", "#EBE1C5"], ["#E4DED0", "#ABCCBD", "#7DBEB8", "#181619", "#E32F21"], ["#058789", "#503D2E", "#D54B1A", "#E3A72F", "#F0ECC9"], ["#FF003C", "#FF8A00", "#FABE28", "#88C100", "#00C176"], ["#311D39", "#67434F", "#9B8E7E", "#C3CCAF", "#A51A41"], ["#EFD9B4", "#D6A692", "#A39081", "#4D6160", "#292522"], ["#C6CCA5", "#8AB8A8", "#6B9997", "#54787D", "#615145"], ["#CC5D4C", "#FFFEC6", "#C7D1AF", "#96B49C", "#5B5847"], ["#111625", "#341931", "#571B3C", "#7A1E48", "#9D2053"], ["#EFEECC", "#FE8B05", "#FE0557", "#400403", "#0AABBA"], ["#CCF390", "#E0E05A", "#F7C41F", "#FC930A", "#FF003D"], ["#73C8A9", "#DEE1B6", "#E1B866", "#BD5532", "#373B44"], ["#79254A", "#795C64", "#79927D", "#AEB18E", "#E3CF9E"], ["#E0EFF1", "#7DB4B5", "#FFFFFF", "#680148", "#000000"], ["#F06D61", "#DA825F", "#C4975C", "#A8AB7B", "#8CBF99"], ["#2D1B33", "#F36A71", "#EE887A", "#E4E391", "#9ABC8A"], ["#2B2726", "#0A516D", "#018790", "#7DAD93", "#BACCA4"], ["#95A131", "#C8CD3B", "#F6F1DE", "#F5B9AE", "#EE0B5B"], ["#360745", "#D61C59", "#E7D84B", "#EFEAC5", "#1B8798"], ["#E3E8CD", "#BCD8BF", "#D3B9A3", "#EE9C92", "#FE857E"], ["#807462", "#A69785", "#B8FAFF", "#E8FDFF", "#665C49"], ["#4B1139", "#3B4058", "#2A6E78", "#7A907C", "#C9B180"], ["#FC284F", "#FF824A", "#FEA887", "#F6E7F7", "#D1D0D7"], ["#FFB884", "#F5DF98", "#FFF8D4", "#C0D1C2", "#2E4347"], ["#027B7F", "#FFA588", "#D62957", "#BF1E62", "#572E4F"], ["#80A8A8", "#909D9E", "#A88C8C", "#FF0D51", "#7A8C89"], ["#A69E80", "#E0BA9B", "#E7A97E", "#D28574", "#3B1922"], ["#A1DBB2", "#FEE5AD", "#FACA66", "#F7A541", "#F45D4C"], ["#641F5E", "#676077", "#65AC92", "#C2C092", "#EDD48E"], ["#FFF3DB", "#E7E4D5", "#D3C8B4", "#C84648", "#703E3B"], ["#F5DD9D", "#BCC499", "#92A68A", "#7B8F8A", "#506266"], ["#2B222C", "#5E4352", "#965D62", "#C7956D", "#F2D974"], ["#D4F7DC", "#DBE7B4", "#DBC092", "#E0846D", "#F51441"], ["#A32C28", "#1C090B", "#384030", "#7B8055", "#BCA875"], ["#85847E", "#AB6A6E", "#F7345B", "#353130", "#CBCFB4"], ["#E6B39A", "#E6CBA5", "#EDE3B4", "#8B9E9B", "#6D7578"], ["#11644D", "#A0B046", "#F2C94E", "#F78145", "#F24E4E"], ["#6D9788", "#1E2528", "#7E1C13", "#BF0A0D", "#E6E1C2"], ["#23192D", "#FD0A54", "#F57576", "#FEBF97", "#F5ECB7"], ["#EB9C4D", "#F2D680", "#F3FFCF", "#BAC9A9", "#697060"], ["#D3D5B0", "#B5CEA4", "#9DC19D", "#8C7C62", "#71443F"], ["#452E3C", "#FF3D5A", "#FFB969", "#EAF27E", "#3B8C88"], ["#041122", "#259073", "#7FDA89", "#C8E98E", "#E6F99D"], ["#B1E6D1", "#77B1A9", "#3D7B80", "#270A33", "#451A3E"], ["#9D9E94", "#C99E93", "#F59D92", "#E5B8AD", "#D5D2C8"], ["#FDCFBF", "#FEB89F", "#E23D75", "#5F0D3B", "#742365"], ["#540045", "#C60052", "#FF714B", "#EAFF87", "#ACFFE9"], ["#B7CBBF", "#8C886F", "#F9A799", "#F4BFAD", "#F5DABD"], ["#280904", "#680E34", "#9A151A", "#C21B12", "#FC4B2A"], ["#F0FFC9", "#A9DA88", "#62997A", "#72243D", "#3B0819"], ["#429398", "#6B5D4D", "#B0A18F", "#DFCDB4", "#FBEED3"], ["#E6EBA9", "#ABBB9F", "#6F8B94", "#706482", "#703D6F"], ["#A3C68C", "#879676", "#6E6662", "#4F364A", "#340735"], ["#44749D", "#C6D4E1", "#FFFFFF", "#EBE7E0", "#BDB8AD"], ["#322938", "#89A194", "#CFC89A", "#CC883A", "#A14016"], ["#CFB590", "#9E9A41", "#758918", "#564334", "#49281F"], ["#FA6A64", "#7A4E48", "#4A4031", "#F6E2BB", "#9EC6B8"], ["#1D1313", "#24B694", "#D22042", "#A3B808", "#30C4C9"], ["#F6D76B", "#FF9036", "#D6254D", "#FF5475", "#FDEBA9"], ["#E7EDEA", "#FFC52C", "#FB0C06", "#030D4F", "#CEECEF"], ["#373737", "#8DB986", "#ACCE91", "#BADB73", "#EFEAE4"], ["#161616", "#C94D65", "#E7C049", "#92B35A", "#1F6764"], ["#26251C", "#EB0A44", "#F2643D", "#F2A73D", "#A0E8B7"], ["#4B3E4D", "#1E8C93", "#DBD8A2", "#C4AC30", "#D74F33"], ["#8D7966", "#A8A39D", "#D8C8B8", "#E2DDD9", "#F8F1E9"], ["#F2E8C4", "#98D9B6", "#3EC9A7", "#2B879E", "#616668"], ["#5CACC4", "#8CD19D", "#CEE879", "#FCB653", "#FF5254"]];
class Simulation implements ISimObject {
particles: Particle[] = []
palette: string[] = []
constructor(private width: number, private height: number) {
// select a random palette
this.palette = ColorPalettes[GetRandomInt(0, ColorPalettes.length)]
// create particles
for (let i = 0; i < ParticleCount; i++) {
this.particles.push(
new Particle(this.width, this.height, this.palette)
)
}
}
Update(imageData: ImageData) {
// Update particles
this.particles.forEach(p => p.Update(imageData))
}
init = false
Draw(ctx: CanvasRenderingContext2D) {
// Draw background
if (!this.init) {
ctx.fillStyle = this.palette[0]
ctx.fillRect(0, 0, this.width, this.height)
this.init = true
}
// Draw particles
this.particles.forEach(p => p.Draw(ctx))
}
}
function createDrawCanvas(imageCtx: CanvasRenderingContext2D, width: number, height: number) {
const updateFrameRate = 50
const renderFrameRate = 50
const canvas = document.createElement('canvas')
document.body.appendChild(canvas)
if (!canvas) return
canvas.width = width
canvas.height = height
const ctx = canvas.getContext('2d')
if (!ctx) return
ctx.imageSmoothingEnabled = true
ctx.imageSmoothingQuality = 'high'
const sim = new Simulation(width, height)
const imageData = imageCtx.getImageData(0, 0, width, height)
setInterval(
() => { sim.Update(imageData) },
1000 / updateFrameRate
)
setInterval(
() => { sim.Draw(ctx) },
1000 / renderFrameRate
)
}
function bootstrapper() {
const width = 400
const height = 400
const imageCanvas = document.createElement('canvas')
document.body.appendChild(imageCanvas)
imageCanvas.width = width
imageCanvas.height = height
const ctx = imageCanvas.getContext('2d')
if (!ctx) return
// create an image element to load the jpg on to
var image = new window.Image()
if (!image) return
image.crossOrigin = 'Anonymous'
image.onload = (e) => {
ctx.drawImage(image, 0, 0, width, height)
createDrawCanvas(ctx, width, height)
}
const images = ['vg.jpg', 'eiffel.jpg', 'elon.jpg', 'gpe.jpg', 'hokusai.jpg', 'joker.jpg', 'scarjo.jpg', 'lion.jpg', 'dali.jpg']
image.src = images[GetRandomInt(0, images.length)]
}
bootstrapper()