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+import townshipGeoJson from '@/assets/mapJson/map.json'
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+
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+export const TOWNSHIP_SOURCE_ID = 'baqing-township'
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+export const TOWNSHIP_FILL_LAYER_ID = 'baqing-township-fill'
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+export const TOWNSHIP_LINE_GLOW_LAYER_ID = 'baqing-township-line-glow'
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+export const TOWNSHIP_LINE_LAYER_ID = 'baqing-township-line'
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+
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+/** 乡镇名称标注手动微调（经度, 纬度） */
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+const TOWNSHIP_LABEL_OVERRIDES = {
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+ 拉西镇: [94.003062, 32.041406],
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+ 玛如乡: [93.862433, 32.341736]
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+}
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+
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+/** 乡镇点击下钻中心手动微调（经度, 纬度） */
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+const TOWNSHIP_DRILL_CENTER_OVERRIDES = {
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+ 拉西镇: [94.054094, 31.920244]
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+}
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+
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+function getTownshipDrillCenter(feature) {
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+ if (!feature) {
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+ return null
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+ }
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+ const name = String(feature.properties?.name || '')
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+ const override = TOWNSHIP_DRILL_CENTER_OVERRIDES[name]
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+ if (Array.isArray(override) && override.length >= 2) {
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+ const lng = Number(override[0])
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+ const lat = Number(override[1])
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+ if (Number.isFinite(lng) && Number.isFinite(lat)) {
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+ return [lng, lat]
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+ }
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+ }
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+
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+ const labelPoint = getTownshipLabelPoints().find((item) => item.name === name)?.lngLat
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+ if (Array.isArray(labelPoint) && labelPoint.length >= 2) {
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+ return [...labelPoint]
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+ }
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+
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+ const center = feature.properties?.center
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+ if (Array.isArray(center) && center.length >= 2) {
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+ return [Number(center[0]), Number(center[1])]
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+ }
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+
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+ return null
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+}
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+
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+export function getTownshipGeoJson() {
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+ return townshipGeoJson
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+}
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+
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+export function getTownshipFeatures(geojson = townshipGeoJson) {
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+ return (geojson?.features || []).filter((feature) => feature?.geometry?.type === 'Polygon')
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+}
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+
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+function getPolygonOuterRing(feature) {
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+ return feature?.geometry?.coordinates?.[0] || null
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+}
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+
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+function pointInPolygon(point, ring) {
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+ const x = point[0]
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+ const y = point[1]
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+ let inside = false
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+ for (let i = 0, j = ring.length - 1; i < ring.length; j = i, i += 1) {
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+ const xi = ring[i][0]
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+ const yi = ring[i][1]
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+ const xj = ring[j][0]
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+ const yj = ring[j][1]
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+ const intersect = yi > y !== yj > y && x < ((xj - xi) * (y - yi)) / (yj - yi) + xi
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+ if (intersect) {
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+ inside = !inside
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+ }
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+ }
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+ return inside
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+}
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+
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+/** 在多边形内部求视觉中心（拉西镇等 concave 面 properties.centroid 可能在面外） */
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+function computePolygonLabelPoint(ring, precision = 0.001) {
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+ if (!Array.isArray(ring) || ring.length < 4) {
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+ return null
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+ }
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+
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+ let minLng = Infinity
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+ let maxLng = -Infinity
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+ let minLat = Infinity
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+ let maxLat = -Infinity
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+ ring.forEach(([lng, lat]) => {
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+ minLng = Math.min(minLng, lng)
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+ maxLng = Math.max(maxLng, lng)
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+ minLat = Math.min(minLat, lat)
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+ maxLat = Math.max(maxLat, lat)
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+ })
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+
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+ const width = maxLng - minLng
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+ const height = maxLat - minLat
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+ if (!Number.isFinite(width) || !Number.isFinite(height) || width <= 0 || height <= 0) {
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+ return null
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+ }
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+
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+ const cellSize = Math.min(width, height)
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+ const half = cellSize / 2
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+ const cells = []
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+
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+ const cellMaxDistance = (lng, lat, inside) => {
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+ if (!inside) {
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+ return -1
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+ }
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+ return Math.min(lng - minLng, maxLng - lng, lat - minLat, maxLat - lat)
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+ }
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+
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+ for (let lng = minLng; lng < maxLng; lng += cellSize) {
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+ for (let lat = minLat; lat < maxLat; lat += cellSize) {
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+ const cx = lng + half
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+ const cy = lat + half
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+ const inside = pointInPolygon([cx, cy], ring)
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+ cells.push({
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+ x: cx,
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+ y: cy,
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+ h: half,
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+ max: cellMaxDistance(cx, cy, inside) + half * Math.SQRT2
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+ })
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+ }
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+ }
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+
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+ cells.sort((a, b) => b.max - a.max)
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+ let best = cells[0]
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+ if (!best) {
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+ return null
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+ }
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+
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+ while (best.h > precision) {
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+ const nextHalf = best.h / 2
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+ let nextBest = null
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+ ;[
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+ [-nextHalf, -nextHalf],
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+ [nextHalf, -nextHalf],
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+ [-nextHalf, nextHalf],
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+ [nextHalf, nextHalf]
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+ ].forEach(([dx, dy]) => {
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+ const cx = best.x + dx
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+ const cy = best.y + dy
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+ const inside = pointInPolygon([cx, cy], ring)
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+ const cell = {
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+ x: cx,
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+ y: cy,
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+ h: nextHalf,
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+ max: cellMaxDistance(cx, cy, inside) + nextHalf * Math.SQRT2
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+ }
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+ if (!nextBest || cell.max > nextBest.max) {
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+ nextBest = cell
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+ }
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+ })
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+ best = nextBest || best
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+ }
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+
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+ return [best.x, best.y]
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+}
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+
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+/** 从多边形几何计算乡镇标注点（手动微调 > 面内视觉中心 > properties.centroid） */
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+export function getTownshipLabelPoints(geojson = townshipGeoJson) {
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+ return getTownshipFeatures(geojson)
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+ .map((feature) => {
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+ const props = feature.properties || {}
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+ const name = String(props.name || '')
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+ const override = TOWNSHIP_LABEL_OVERRIDES[name]
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+ let lngLat = null
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+
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+ if (Array.isArray(override) && override.length >= 2) {
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+ const lng = Number(override[0])
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+ const lat = Number(override[1])
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+ if (Number.isFinite(lng) && Number.isFinite(lat)) {
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+ lngLat = [lng, lat]
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+ }
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+ }
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+
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+ if (!lngLat) {
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+ const ring = getPolygonOuterRing(feature)
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+ lngLat = computePolygonLabelPoint(ring)
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+ }
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+
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+ if (!lngLat) {
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+ const center = props.centroid || props.center
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+ if (!Array.isArray(center) || center.length < 2) {
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+ return null
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+ }
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+ const lng = Number(center[0])
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+ const lat = Number(center[1])
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+ if (!Number.isFinite(lng) || !Number.isFinite(lat)) {
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+ return null
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+ }
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+ lngLat = [lng, lat]
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+ }
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+
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+ return {
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+ name,
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+ adcode: props.adcode,
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+ lngLat
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+ }
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+ })
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+ .filter(Boolean)
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+}
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+
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+export function getTownshipBounds(feature) {
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+ const ring = getPolygonOuterRing(feature)
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+ if (!ring?.length) {
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+ return null
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+ }
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+
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+ let minLng = Infinity
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+ let maxLng = -Infinity
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+ let minLat = Infinity
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+ let maxLat = -Infinity
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+ ring.forEach(([lng, lat]) => {
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+ minLng = Math.min(minLng, lng)
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+ maxLng = Math.max(maxLng, lng)
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+ minLat = Math.min(minLat, lat)
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+ maxLat = Math.max(maxLat, lat)
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+ })
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+
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+ if (!Number.isFinite(minLng) || !Number.isFinite(maxLng) || !Number.isFinite(minLat) || !Number.isFinite(maxLat)) {
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+ return null
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+ }
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+
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+ return [
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+ [minLng, minLat],
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+ [maxLng, maxLat]
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+ ]
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+}
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+
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+/** 根据点击坐标命中乡镇面 */
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+export function findTownshipFeatureByLngLat(lngLat, geojson = townshipGeoJson) {
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+ const lng = Number(lngLat?.lng ?? lngLat?.[0])
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+ const lat = Number(lngLat?.lat ?? lngLat?.[1])
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+ if (!Number.isFinite(lng) || !Number.isFinite(lat)) {
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+ return null
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+ }
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+
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+ return (
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+ getTownshipFeatures(geojson).find((feature) => {
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+ const ring = getPolygonOuterRing(feature)
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+ return ring && pointInPolygon([lng, lat], ring)
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+ }) || null
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+ )
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+}
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+
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+export function buildTownshipInfo(feature) {
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+ if (!feature) {
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+ return null
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+ }
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+ const props = feature.properties || {}
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+ const name = String(props.name || '')
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+ const labelPoint = getTownshipLabelPoints().find((item) => item.name === name)?.lngLat || null
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+ const drillCenter = getTownshipDrillCenter(feature)
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+
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+ return {
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+ name,
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+ adcode: props.adcode,
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+ center: Array.isArray(props.center) ? [...props.center] : null,
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+ centroid: Array.isArray(props.centroid) ? [...props.centroid] : null,
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+ labelPoint: labelPoint ? [...labelPoint] : null,
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+ drillCenter: drillCenter ? [...drillCenter] : null,
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+ bounds: getTownshipBounds(feature)
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+ }
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+}
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+
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+/** 点击乡镇后缩放到指定级别（默认 zoom 19，中心取标注点/中心点） */
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+export function flyToTownship(map, feature, options = {}) {
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+ if (!map || !feature) {
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+ return false
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+ }
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+
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+ const duration = Number(options.duration) || 900
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+ const zoom = Number(options.zoom ?? options.maxZoom) || 19
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+ const center = getTownshipDrillCenter(feature)
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+
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+ if (Array.isArray(center) && center.length >= 2 && typeof map.easeTo === 'function') {
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+ map.easeTo({
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+ center,
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+ zoom,
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+ duration,
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+ essential: true
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+ })
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+ return true
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+ }
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+
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+ return false
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+}
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+
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+export function addTownshipBoundaryLayers(map, geojson = townshipGeoJson) {
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+ if (!map || typeof map.addSource !== 'function') {
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+ return false
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+ }
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+ if (map.getSource(TOWNSHIP_SOURCE_ID)) {
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+ return true
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+ }
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+
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+ map.addSource(TOWNSHIP_SOURCE_ID, {
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+ type: 'geojson',
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+ data: geojson
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+ })
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+
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+ map.addLayer({
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+ id: TOWNSHIP_FILL_LAYER_ID,
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+ type: 'fill',
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+ source: TOWNSHIP_SOURCE_ID,
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+ paint: {
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+ 'fill-color': 'rgba(0, 0, 0, 0)',
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+ 'fill-outline-color': 'transparent'
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+ }
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+ })
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+
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+ map.addLayer({
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+ id: TOWNSHIP_LINE_GLOW_LAYER_ID,
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+ type: 'line',
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313
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+ source: TOWNSHIP_SOURCE_ID,
|
|
|
314
|
+ paint: {
|
|
|
315
|
+ 'line-color': 'rgba(0, 229, 204, 0.5)',
|
|
|
316
|
+ 'line-width': 3.5,
|
|
|
317
|
+ 'line-blur': 2
|
|
|
318
|
+ }
|
|
|
319
|
+ })
|
|
|
320
|
+
|
|
|
321
|
+ map.addLayer({
|
|
|
322
|
+ id: TOWNSHIP_LINE_LAYER_ID,
|
|
|
323
|
+ type: 'line',
|
|
|
324
|
+ source: TOWNSHIP_SOURCE_ID,
|
|
|
325
|
+ paint: {
|
|
|
326
|
+ 'line-color': '#b8fff2',
|
|
|
327
|
+ 'line-width': 1.2
|
|
|
328
|
+ }
|
|
|
329
|
+ })
|
|
|
330
|
+
|
|
|
331
|
+ return true
|
|
|
332
|
+}
|
|
|
333
|
+
|
|
|
334
|
+export function removeTownshipBoundaryLayers(map) {
|
|
|
335
|
+ if (!map) {
|
|
|
336
|
+ return
|
|
|
337
|
+ }
|
|
|
338
|
+ ;[TOWNSHIP_LINE_LAYER_ID, TOWNSHIP_LINE_GLOW_LAYER_ID, TOWNSHIP_FILL_LAYER_ID].forEach((id) => {
|
|
|
339
|
+ if (typeof map.getLayer === 'function' && map.getLayer(id)) {
|
|
|
340
|
+ map.removeLayer(id)
|
|
|
341
|
+ }
|
|
|
342
|
+ })
|
|
|
343
|
+ if (typeof map.getSource === 'function' && map.getSource(TOWNSHIP_SOURCE_ID)) {
|
|
|
344
|
+ map.removeSource(TOWNSHIP_SOURCE_ID)
|
|
|
345
|
+ }
|
|
|
346
|
+}
|
|
|
347
|
+
|
|
|
348
|
+/** 点击乡镇面触发下钻 */
|
|
|
349
|
+export function bindTownshipBoundaryClick(map, onSelect) {
|
|
|
350
|
+ if (!map || typeof map.on !== 'function' || typeof onSelect !== 'function') {
|
|
|
351
|
+ return () => {}
|
|
|
352
|
+ }
|
|
|
353
|
+
|
|
|
354
|
+ const resolveFeature = (eventFeature) => {
|
|
|
355
|
+ const adcode = eventFeature?.properties?.adcode
|
|
|
356
|
+ if (adcode == null) {
|
|
|
357
|
+ return eventFeature
|
|
|
358
|
+ }
|
|
|
359
|
+ return getTownshipFeatures().find((feature) => feature.properties?.adcode === adcode) || eventFeature
|
|
|
360
|
+ }
|
|
|
361
|
+
|
|
|
362
|
+ const onClick = (e) => {
|
|
|
363
|
+ if (!e.features?.length) {
|
|
|
364
|
+ return
|
|
|
365
|
+ }
|
|
|
366
|
+ const feature = resolveFeature(e.features[0])
|
|
|
367
|
+ onSelect(feature, e)
|
|
|
368
|
+ }
|
|
|
369
|
+
|
|
|
370
|
+ const onEnter = () => {
|
|
|
371
|
+ if (typeof map.getCanvas === 'function') {
|
|
|
372
|
+ map.getCanvas().style.cursor = 'pointer'
|
|
|
373
|
+ }
|
|
|
374
|
+ }
|
|
|
375
|
+
|
|
|
376
|
+ const onLeave = () => {
|
|
|
377
|
+ if (typeof map.getCanvas === 'function') {
|
|
|
378
|
+ map.getCanvas().style.cursor = ''
|
|
|
379
|
+ }
|
|
|
380
|
+ }
|
|
|
381
|
+
|
|
|
382
|
+ map.on('click', TOWNSHIP_FILL_LAYER_ID, onClick)
|
|
|
383
|
+ map.on('mouseenter', TOWNSHIP_FILL_LAYER_ID, onEnter)
|
|
|
384
|
+ map.on('mouseleave', TOWNSHIP_FILL_LAYER_ID, onLeave)
|
|
|
385
|
+
|
|
|
386
|
+ return () => {
|
|
|
387
|
+ map.off('click', TOWNSHIP_FILL_LAYER_ID, onClick)
|
|
|
388
|
+ map.off('mouseenter', TOWNSHIP_FILL_LAYER_ID, onEnter)
|
|
|
389
|
+ map.off('mouseleave', TOWNSHIP_FILL_LAYER_ID, onLeave)
|
|
|
390
|
+ onLeave()
|
|
|
391
|
+ }
|
|
|
392
|
+}
|
xsh_1997