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| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 | import { forEach } from 'lodash' import measureText from 'measure-text' import d3 from 'd3' // TODO: replace w/ other quadtree library import { getFontSizeWithUnit } from '../util' import SegmentLabel from './segmentlabel' /** * Labeler object */ export default class Labeler { constructor(transitive) { this.transitive = transitive this.clear() } clear() { this.points = [] } updateLabelList(graph) { this.points = [] forEach(graph.vertices, (vertex) => { const point = vertex.point if ( point.getType() === 'PLACE' || point.getType() === 'MULTI' || (point.getType() === 'STOP' && point.isSegmentEndPoint) ) { this.points.push(point) } }) this.points.sort((a, b) => { if (a.containsFromPoint() || a.containsToPoint()) return -1 if (b.containsFromPoint() || b.containsToPoint()) return 1 return 0 }) } updateQuadtree() { this.quadtree = d3.geom.quadtree().extent([ [-this.width, -this.height], [this.width * 2, this.height * 2] ])([]) this.addPointsToQuadtree() // this.addSegmentsToQuadtree(); } addPointsToQuadtree() { forEach(this.points, (point) => { const mbbox = point.getMarkerBBox() if (mbbox) this.addBBoxToQuadtree(point.getMarkerBBox()) }) } addSegmentsToQuadtree() { forEach(this.transitive.renderSegments, (segment) => { if (segment.getType() !== 'TRANSIT') return let lw = this.transitive.style.compute( this.transitive.style.segments['stroke-width'], this.transitive.display, segment ) lw = parseFloat(lw.substring(0, lw.length - 2), 10) - 2 let x, x1, x2, y, y1, y2 // debug(segment.toString()); if (segment.renderData.length === 2) { // basic straight segment if (segment.renderData[0].x === segment.renderData[1].x) { // vertical x = segment.renderData[0].x - lw / 2 y1 = segment.renderData[0].y y2 = segment.renderData[1].y this.addBBoxToQuadtree({ height: Math.abs(y1 - y2), width: lw, x: x, y: Math.min(y1, y2) }) } else if (segment.renderData[0].y === segment.renderData[1].y) { // horizontal x1 = segment.renderData[0].x x2 = segment.renderData[1].x y = segment.renderData[0].y - lw / 2 this.addBBoxToQuadtree({ height: lw, width: Math.abs(x1 - x2), x: Math.min(x1, x2), y: y }) } } if (segment.renderData.length === 4) { // basic curved segment if (segment.renderData[0].x === segment.renderData[1].x) { // vertical first x = segment.renderData[0].x - lw / 2 y1 = segment.renderData[0].y y2 = segment.renderData[3].y this.addBBoxToQuadtree({ height: Math.abs(y1 - y2), width: lw, x: x, y: Math.min(y1, y2) }) x1 = segment.renderData[0].x x2 = segment.renderData[3].x y = segment.renderData[3].y - lw / 2 this.addBBoxToQuadtree({ height: lw, width: Math.abs(x1 - x2), x: Math.min(x1, x2), y: y }) } else if (segment.renderData[0].y === segment.renderData[1].y) { // horiz first x1 = segment.renderData[0].x x2 = segment.renderData[3].x y = segment.renderData[0].y - lw / 2 this.addBBoxToQuadtree({ height: lw, width: Math.abs(x1 - x2), x: Math.min(x1, x2), y: y }) x = segment.renderData[3].x - lw / 2 y1 = segment.renderData[0].y y2 = segment.renderData[3].y this.addBBoxToQuadtree({ height: Math.abs(y1 - y2), width: lw, x: x, y: Math.min(y1, y2) }) } } }) } addBBoxToQuadtree(bbox) { if ( bbox.x + bbox.width / 2 < 0 || bbox.x - bbox.width / 2 > this.width || bbox.y + bbox.height / 2 < 0 || bbox.y - bbox.height / 2 > this.height ) { return } this.quadtree.add([bbox.x + bbox.width / 2, bbox.y + bbox.height / 2, bbox]) this.maxBBoxWidth = Math.max(this.maxBBoxWidth, bbox.width) this.maxBBoxHeight = Math.max(this.maxBBoxHeight, bbox.height) } doLayout() { this.width = this.transitive.display.width this.height = this.transitive.display.height this.maxBBoxWidth = 0 this.maxBBoxHeight = 0 this.updateQuadtree() return { pointLabels: this.placePointLabels(), segmentLabels: this.placeSegmentLabels() } } /** placePointLabels **/ placePointLabels() { const styler = this.transitive.styler const placedLabels = [] // var labeledPoints = [] forEach(this.points, (point) => { const labelText = point.label.getText() if (!labelText) return point.label.fontFamily = styler.compute2('labels', 'font-family', point) point.label.fontSize = styler.compute2('labels', 'font-size', point) const textDimensions = measureText({ fontFamily: point.label.fontFamily || 'sans-serif', fontSize: point.label.fontSize, lineHeight: 1.2, text: labelText }) point.label.textWidth = textDimensions.width.value point.label.textHeight = textDimensions.height.value const orientations = styler.compute( styler.labels.orientations, this.transitive.display, { point: point } ) let placedLabel = false for (let i = 0; i < orientations.length; i++) { point.label.setOrientation(orientations[i]) if (!point.focused) continue if (!point.label.labelAnchor) continue const lx = point.label.labelAnchor.x const ly = point.label.labelAnchor.y // do not place label if out of range if (lx <= 0 || ly <= 0 || lx >= this.width || ly > this.height) continue const labelBBox = point.label.getBBox() const overlaps = this.findOverlaps(point.label, labelBBox) // do not place label if it overlaps with others if (overlaps.length > 0) continue // if we reach this point, the label is good to place point.label.setVisibility(true) // labeledPoints.push(point) placedLabels.push(point.label) this.quadtree.add([ labelBBox.x + labelBBox.width / 2, labelBBox.y + labelBBox.height / 2, point.label ]) this.maxBBoxWidth = Math.max(this.maxBBoxWidth, labelBBox.width) this.maxBBoxHeight = Math.max(this.maxBBoxHeight, labelBBox.height) placedLabel = true break // do not consider any other orientations after places } // end of orientation loop // if label not placed at all, hide the element if (!placedLabel) { point.label.setVisibility(false) } }) return placedLabels } /** placeSegmentLabels **/ placeSegmentLabels() { this.placedLabelKeys = [] const placedLabels = [] // collect the bus RenderSegments const busRSegments = [] forEach(this.transitive.network.paths, (path) => { forEach(path.getRenderedSegments(), (rSegment) => { if (rSegment.type === 'TRANSIT' && rSegment.mode === 3) { busRSegments.push(rSegment) } }) }) // Generate labels for GTFS route/mode types listed in labeledModes if provided. // If labeled modes is not provided, only label the buses (mode '3'). let edgeGroups = [] const busModes = [3] const labeledModes = this.transitive.options.labeledModes || busModes forEach(this.transitive.network.paths, (path) => { forEach(path.segments, (segment) => { if ( segment.type === 'TRANSIT' && labeledModes.includes(segment.getMode()) ) { edgeGroups = edgeGroups.concat(segment.getLabelEdgeGroups()) } }) }) // iterate through the sequence collection, labeling as necessary forEach(edgeGroups, (edgeGroup) => { this.currentGroup = edgeGroup // get the array of label strings to be places (typically the unique // route short names) this.labelTextArray = edgeGroup.getLabelTextArray() // create the initial label for placement this.labelTextIndex = 0 let label = this.getNextLabel() if (!label) return // Iterate through potential anchor locations, attempting placement at // each one const labelAnchors = edgeGroup.getLabelAnchors( this.transitive.display, label.textHeight * 1.5 ) for (let i = 0; i < labelAnchors.length; i++) { label.labelAnchor = labelAnchors[i] const { x, y } = label.labelAnchor // do not consider this anchor if it is out of the display range if (!this.transitive.display.isInRange(x, y)) continue // check for conflicts with existing placed elements const conflicts = this.findOverlaps(label, label.getBBox()) if (conflicts.length === 0) { // If no overlaps/conflicts encountered, place the current label. placedLabels.push(label) // Track new label in quadtree. this.quadtree.add([x, y, label]) label = this.getNextLabel() if (!label) break } } // end of anchor iteration loop }) // end of sequence iteration loop return placedLabels } getNextLabel() { while (this.labelTextIndex < this.labelTextArray.length) { const labelText = this.labelTextArray[this.labelTextIndex] const key = this.currentGroup.edgeIds + '_' + labelText if (this.placedLabelKeys.indexOf(key) !== -1) { this.labelTextIndex++ continue } const label = this.constructSegmentLabel( this.currentGroup.renderedSegment, labelText ) this.placedLabelKeys.push(key) this.labelTextIndex++ return label } return null } constructSegmentLabel(segment, labelText) { const label = new SegmentLabel(segment, labelText) const styler = this.transitive.styler label.fontFamily = styler.compute2('segment_labels', 'font-family', segment) label.fontSize = styler.compute2('segment_labels', 'font-size', segment) const textDimensions = measureText({ fontFamily: label.fontFamily || 'sans-serif', // Append 'px' if a unit was not specified in font-size. fontSize: getFontSizeWithUnit(label.fontSize), lineHeight: 1.2, text: labelText }) label.textWidth = textDimensions.width.value label.textHeight = textDimensions.height.value label.computeContainerDimensions() return label } findOverlaps(label, labelBBox) { // Get bounding box to check. const minX = labelBBox.x - this.maxBBoxWidth / 2 const minY = labelBBox.y - this.maxBBoxHeight / 2 const maxX = labelBBox.x + labelBBox.width + this.maxBBoxWidth / 2 const maxY = labelBBox.y + labelBBox.height + this.maxBBoxHeight / 2 // debug('findOverlaps %s,%s %s,%s', minX,minY,maxX,maxY); const matchItems = [] // Check quadtree for potential collisions. this.quadtree.visit((node, x1, y1, x2, y2) => { const { point } = node if (point) { const [pX, pY, pLabel] = point if ( pX >= minX && pX < maxX && pY >= minY && pY < maxY && label.intersects(pLabel) ) { matchItems.push(pLabel) } } // No need to visit children of this node if bbox falls entirely within // this node. return x1 > maxX || y1 > maxY || x2 < minX || y2 < minY }) return matchItems } findNearbySegmentLabels(label, x, y, buffer) { const minX = x - buffer const minY = y - buffer const maxX = x + buffer const maxY = y + buffer // debug('findNearby %s,%s %s,%s', minX,minY,maxX,maxY); const matchItems = [] this.quadtree.visit((node, x1, y1, x2, y2) => { const p = node.point if ( p && p[0] >= minX && p[0] < maxX && p[1] >= minY && p[1] < maxY && p[2].parent && label.parent.patternIds === p[2].parent.patternIds ) { matchItems.push(p[2]) } return x1 > maxX || y1 > maxY || x2 < minX || y2 < minY }) return matchItems } } |