-
Notifications
You must be signed in to change notification settings - Fork 2
/
isochron.js
255 lines (223 loc) · 8.75 KB
/
isochron.js
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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
import { Worker } from 'react-native-workers'
import Color from 'color'
const debug = false // set to true to enable log messages for debug
export const ISOCHRON_NOT_LOADED = 'ISOCHRON_NOT_LOADED'
export const ISOCHRON_LOADING = 'ISOCHRON_LOADING'
export const ISOCHRON_LOADED = 'ISOCHRON_LOADED'
export const ISOCHRON_ERROR = 'ISOCHRON_ERROR'
export const ISOCHRON_ABORT = 'ISOCHRON_ABORT'
export const POLYGONS_NOT_LOADED = 'POLYGONS_NOT_LOADED'
export const POLYGONS_LOADING = 'POLYGONS_LOADING'
export const POLYGONS_LOADED = 'POLYGONS_LOADED'
const isochronTimeout = 15000 // 15-second time out
let worker = null
let savedArgString = ''
let updateIsochronsState = null
let isochronSetTimeout = null
export let isochronsState = ISOCHRON_NOT_LOADED
export let polygonsState = POLYGONS_NOT_LOADED
export let savedPolygons = []
export let savedPolygonsFeature = []
const initPolygon = () => {
savedPolygons = []
savedPolygonsFeature = []
polygonsState = POLYGONS_NOT_LOADED
}
const savePolygon = (index, data, length) => {
polygonsState = POLYGONS_LOADING
savedPolygons[index] = data // update saved isochrons
let polygonArray = []
data.map(d => {
let polygon = d.polygon
let holes = d.holes
let polygonWithHoles = []
let p = []
polygon.map(c => p.push([ c.longitude, c.latitude ]))
if (JSON.stringify(p[0]) != JSON.stringify(p[p.length-1])) { p.push(p[0]) } // close polygon if it's not
polygonWithHoles.push(p)
holes.map(hole => {
let h = []
hole.map(c => h.push([ c.longitude, c.latitude ]))
if (JSON.stringify(h[0]) != JSON.stringify(h[h.length-1])) { h.push(h[0]) } // close polygon if it's not
polygonWithHoles.push(h)
})
polygonArray.push(polygonWithHoles)
})
savedPolygonsFeature[index] = { index: index, polygonArray: polygonArray }
// we are done when ALL polygons have been updated, not just one
if (length === savedPolygonsFeature.reduce(a => a + 1, 0)) {
polygonsState = POLYGONS_LOADED
}
}
export const doneWithSavedPolygonsFeature = () => {
//console.log('doneWithSavedPolygonsFeature')
// set to null to enable garbage collection and reduce memory footprint
savedPolygonsFeature = null
}
export const setUpdateIsochronsStateFn = updateFn => {
updateIsochronsState = updateFn
}
export const terminateIsochronWorker = () => {
if (worker) {
if (debug) console.tron.display({ name: 'terminateIsochronWorker', value: 'terminating isochron worker' })
worker.terminate() // terminate worker if it was running
worker = null
}
}
const checkIsochrons = () => {
if (isochronsState === ISOCHRON_LOADING) {
terminateIsochronWorker()
console.tron.error('Loading isochron aborted')
isochronsState = ISOCHRON_ABORT
updateIsochronsState && updateIsochronsState(isochronsState)
isochronSetTimeout && clearTimeout(isochronSetTimeout)
isochronSetTimeout = null
}
}
export const updateIsochrons = args => {
const params = args.params
const argString = JSON.stringify(params)
if (params.skip) {
// pretend isochrons are loaded
isochronsState = ISOCHRON_LOADED
updateIsochronsState && updateIsochronsState(isochronsState)
return
}
if (!params.force && (argString === savedArgString && (isochronsState === ISOCHRON_LOADING || isochronsState === ISOCHRON_LOADED))) {
if (debug) console.tron.display({ name: 'updateIsochrons', value: isochronsState })
updateIsochronsState && updateIsochronsState(isochronsState)
return
}
// save arguments string
savedArgString = argString
isochronsState = ISOCHRON_NOT_LOADED
updateIsochronsState && updateIsochronsState(isochronsState)
// reset isochrons (to avoid weird display)
initPolygon()
terminateIsochronWorker()
isochronsState = ISOCHRON_LOADING
updateIsochronsState && updateIsochronsState(isochronsState)
isochronSetTimeout = setTimeout(() => checkIsochrons(), isochronTimeout)
// create worker and send it some work
worker = new Worker(`App/Workers/isochronWorker_${params.provider}.js`)
worker.onmessage = messageString => {
const message = JSON.parse(messageString)
if (message.id === 'update') {
if (debug) console.tron.display({ name: 'isochron update from worker', value: message.polygons.length })
savePolygon(message.index, message.polygons, params.durations.length - 1)
} else if (message.id === 'done') {
isochronsState = ISOCHRON_LOADED
updateIsochronsState && updateIsochronsState(isochronsState)
isochronSetTimeout && clearTimeout(isochronSetTimeout)
isochronSetTimeout = null
terminateIsochronWorker()
} else if (message.id === 'log') {
console.tron.display({ name: 'Isochron worker ' + message.name, value: message.log })
} else if (message.id === 'error') {
console.tron.error('Isochron worker reported an error: ' + message.error)
isochronsState = ISOCHRON_ERROR
updateIsochronsState && updateIsochronsState(isochronsState)
terminateIsochronWorker()
} else {
console.tron.error('Isochron worker unknown message: ' + messageString)
isochronsState = ISOCHRON_ERROR
updateIsochronsState && updateIsochronsState(isochronsState)
terminateIsochronWorker()
}
}
worker.postMessage(JSON.stringify({ id: 'start', params: params }))
}
export const getIsochronDurations = duration => {
//return [ 0, 600, 1200, 1800 ]
duration = duration || 30 // default to 30min if not provided
let durations = []
// divide duration into 4 to 6 intervals (interval is a multiple of 5min)
let interval
for (let i = 5; i < duration; i += 5) {
if (duration % i === 0 && (duration / i <= 6) && (duration / i >= 4)) {
interval = i
break
}
}
if (!interval) {
durations = [ 0, duration * 60 ]
} else {
for (let i = 0; i <= duration; i += interval) {
durations.push(i * 60)
}
}
if (debug) { console.tron.display({ name: 'getIsochronDurations', value: durations }) }
return durations
}
export const isochronFillColor = (ratio, opacityFactor, buttonMode) => {
let r = 255
let g = 255
let b = 0
if (ratio < 1/2) {
r = Math.ceil(255 * ratio * 2)
} else {
b = Math.ceil(255 * (ratio - 1/2) * 2)
//r = Math.ceil(255 * (1 - ratio/2) * 2)
g = Math.ceil(255 * (1 - ratio) * 2)
}
//let { r, g, b } = makeColorGradient(ratio * 3.14)
let a = buttonMode ? 1.0 : 0.2 * opacityFactor * (brightness(r, g, b) / 255)
if (buttonMode) {
({ r, g, b } = Color({ r, g, b }).rotate(-10).saturate(0.5).darken(0.2).rgb())
}
return `rgba(${r}, ${g}, ${b}, ${a})`
}
const brightness = (r, g, b) => {
return Math.sqrt( 0.241 * Math.pow(r, 2) + 0.691 * Math.pow(g, 2) + 0.068 * Math.pow(b, 2) )
}
// const makeColorGradient = i => {
// let frequency1 = 1, frequency2 = 1, frequency3 = 1
// let phase1 = 0, phase2 = 3.14 / 2, phase3 = 3.14
// let center = 128
// let width = 255 - center
//
// let red = Math.sin(frequency1 * i + phase1) * width + center
// let grn = Math.sin(frequency2 * i + phase2) * width + center
// let blu = Math.sin(frequency3 * i + phase3) * width + center
//
// return { r: red, g: grn, b: blu }
// }
let checkWorker = null
export const terminateCheckIsochronAPIWorker = () => {
if (checkWorker) {
if (debug) console.tron.display({ name: 'terminateCheckIsochronAPIWorker', value: 'terminating checkIsochronAPI worker' })
checkWorker.terminate() // terminate worker if it was running
checkWorker = null
}
}
export const checkIsochronAPI = args => {
return new Promise((resolve, reject) => {
let params = args.params
if (params.durations.length > 2) {
params.durations = params.durations.slice(0, 2)
}
terminateCheckIsochronAPIWorker()
// create worker and send it some work
checkWorker = new Worker(`App/Workers/isochronWorker_${params.provider}.js`)
checkWorker.onmessage = messageString => {
const message = JSON.parse(messageString)
if (message.id === 'update') {
if (debug) console.tron.display({ name: 'checkIsochronAPI update from worker', value: message.polygons.length })
resolve({ polygonIndex: message.index, polygons: message.polygons })
} else if (message.id === 'done') {
terminateCheckIsochronAPIWorker()
} else if (message.id === 'log') {
console.tron.display({ name: 'checkIsochronAPI worker ' + message.name, value: message.log })
} else if (message.id === 'error') {
console.tron.error('checkIsochronAPI worker reported an error: ' + message.error)
terminateCheckIsochronAPIWorker()
reject({ error: message.error })
} else {
console.tron.error('checkIsochronAPI worker unknown message: ' + messageString)
terminateCheckIsochronAPIWorker()
reject({ error: messageString })
}
}
checkWorker.postMessage(JSON.stringify({ id: 'start', params: params }))
})
}