342 lines
10 KiB
JavaScript
342 lines
10 KiB
JavaScript
import { VERSION as ol_util_VERSION } from 'ol/util.js'
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import ol_layer_Image from 'ol/layer/Image.js'
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import ol_source_ImageCanvas from 'ol/source/ImageCanvas.js'
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import {easeOut as ol_easing_easeOut} from 'ol/easing.js'
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import ol_style_Style from 'ol/style/Style.js'
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import ol_style_Stroke from 'ol/style/Stroke.js'
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import ol_style_Fill from 'ol/style/Fill.js'
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import {asString as ol_color_asString} from 'ol/color.js'
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/**
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* @classdesc 3D vector layer rendering
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* @constructor
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* @extends {pl.layer.Image}
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* @param {Object} options
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* @param {ol.layer.Vector} options.source the source to display in 3D
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* @param {ol.style.Style} options.styler drawing style
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* @param {number} options.maxResolution max resolution to render 3D
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* @param {number} options.defaultHeight default height if none is return by a propertie
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* @param {function|string|Number} options.height a height function (returns height giving a feature) or a popertie name for the height or a fixed value
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* @param {Array<number>} options.center center of the view, default [.5,1]
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*/
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var ol_layer_Vector3D = class ollayerVector3D extends ol_layer_Image {
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constructor(options) {
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options = options || {}
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var canvas = document.createElement('canvas')
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super({
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source: new ol_source_ImageCanvas({
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canvasFunction: function (extent, resolution, pixelRatio, size /*, projection*/) {
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canvas.width = size[0]
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canvas.height = size[1]
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return canvas
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}
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}),
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center: options.center || [.5, 1],
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defaultHeight: options.defaultHeight || 0,
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maxResolution: options.maxResolution || Infinity
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})
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this._source = options.source
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this.height_ = this.getHfn(options.height)
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this.setStyle(options.style)
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this.on(['postcompose', 'postrender'], this.onPostcompose_.bind(this))
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}
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/**
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* Set the height function for the layer
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* @param {function|string|Number} height a height function (returns height giving a feature) or a popertie name or a fixed value
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*/
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setHeight(height) {
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this.height_ = this.getHfn(height)
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this.changed()
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}
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/**
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* Set style associated with the layer
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* @param {ol.style.Style} s
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*/
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setStyle(s) {
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if (s instanceof ol_style_Style)
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this._style = s
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else
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this._style = new ol_style_Style()
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if (!this._style.getStroke()) {
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this._style.setStroke(new ol_style_Stroke({
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width: 1,
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color: 'red'
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}))
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}
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if (!this._style.getFill()) {
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this._style.setFill(new ol_style_Fill({ color: 'rgba(0,0,255,0.5)' }))
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}
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if (!this._style.getText()) {
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this._style.setText(new ol_style_Fill({
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color: 'red'
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})
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)
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}
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// Get the geometry
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if (s && s.getGeometry()) {
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var geom = s.getGeometry()
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if (typeof (geom) === 'function') {
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this.set('geometry', geom)
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} else {
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this.set('geometry', function () { return geom })
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}
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} else {
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this.set('geometry', function (f) { return f.getGeometry() })
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}
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}
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/**
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* Get style associated with the layer
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* @return {ol.style.Style}
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*/
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getStyle() {
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return this._style
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}
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/** Calculate 3D at potcompose
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* @private
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*/
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onPostcompose_(e) {
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var res = e.frameState.viewState.resolution
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if (res > this.get('maxResolution'))
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return
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this.res_ = res * 400
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if (this.animate_) {
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var elapsed = e.frameState.time - this.animate_
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if (elapsed < this.animateDuration_) {
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this.elapsedRatio_ = this.easing_(elapsed / this.animateDuration_)
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// tell OL3 to continue postcompose animation
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e.frameState.animate = true
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} else {
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this.animate_ = false
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this.height_ = this.toHeight_
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}
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}
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var ratio = this._ratio = e.frameState.pixelRatio
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var ctx = e.context
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this.matrix_ = e.frameState.coordinateToPixelTransform
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this.inversePixelTransform_ = e.inversePixelTransform;
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if (e.frameState.size) {
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this.center_ = [e.frameState.size[0] / 2, e.frameState.size[1]]
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}
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var f = this._source.getFeaturesInExtent(e.frameState.extent)
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ctx.save()
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ctx.scale(ratio, ratio)
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var s = this.getStyle()
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ctx.lineWidth = s.getStroke().getWidth()
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ctx.lineCap = s.getStroke().getLineCap()
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ctx.strokeStyle = ol_color_asString(s.getStroke().getColor())
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ctx.fillStyle = ol_color_asString(s.getFill().getColor())
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var builds = []
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for (var i = 0; i < f.length; i++) {
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builds.push(this.getFeature3D_(f[i], this._getFeatureHeight(f[i])))
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}
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this.drawFeature3D_(ctx, builds)
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ctx.restore()
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}
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/** Create a function that return height of a feature
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* @param {function|string|number} h a height function or a popertie name or a fixed value
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* @return {function} function(f) return height of the feature f
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* @private
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*/
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getHfn(h) {
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switch (typeof (h)) {
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case 'function': return h
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case 'string': {
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var dh = this.get('defaultHeight')
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return (function (f) {
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return (Number(f.get(h)) || dh)
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})
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}
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case 'number': return (function ( /*f*/) { return h })
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default: return (function ( /*f*/) { return 10 })
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}
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}
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/** Animate rendering
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* @param {*} options
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* @param {string|function|number} options.height an attribute name or a function returning height of a feature or a fixed value
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* @param {number} options.duration the duration of the animatioin ms, default 1000
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* @param {ol.easing} options.easing an ol easing function
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* @api
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*/
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animate(options) {
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options = options || {}
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this.toHeight_ = this.getHfn(options.height)
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this.animate_ = new Date().getTime()
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this.animateDuration_ = options.duration || 1000
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this.easing_ = options.easing || ol_easing_easeOut
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// Force redraw
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this.changed()
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}
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/** Check if animation is on
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* @return {bool}
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*/
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animating() {
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if (this.animate_ && new Date().getTime() - this.animate_ > this.animateDuration_) {
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this.animate_ = false
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}
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return !!this.animate_
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}
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/** Get height for a feature
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* @param {ol.Feature} f
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* @return {number}
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* @private
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*/
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_getFeatureHeight(f) {
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if (this.animate_) {
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var h1 = this.height_(f)
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var h2 = this.toHeight_(f)
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return (h1 * (1 - this.elapsedRatio_) + this.elapsedRatio_ * h2)
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}
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else
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return this.height_(f)
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}
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/** Get hvector for a point
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* @private
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*/
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hvector_(pt, h) {
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var p0 = [
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pt[0] * this.matrix_[0] + pt[1] * this.matrix_[1] + this.matrix_[4],
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pt[0] * this.matrix_[2] + pt[1] * this.matrix_[3] + this.matrix_[5]
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]
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var p1 = [
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p0[0] + h / this.res_ * (p0[0] - this.center_[0]),
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p0[1] + h / this.res_ * (p0[1] - this.center_[1])
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]
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var version = parseFloat(ol_util_VERSION);
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// ol@v9.1+
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if (version > 9.0) {
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p0 = [
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p0[0] * this.inversePixelTransform_[0] - p0[1] * this.inversePixelTransform_[1] + this.inversePixelTransform_[4],
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- p0[0] * this.inversePixelTransform_[2] + p0[1] * this.inversePixelTransform_[3] + this.inversePixelTransform_[5]
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]
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p1 = [
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p1[0] * this.inversePixelTransform_[0] - p1[1] * this.inversePixelTransform_[1] + this.inversePixelTransform_[4],
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- p1[0] * this.inversePixelTransform_[2] + p1[1] * this.inversePixelTransform_[3] + this.inversePixelTransform_[5]
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]
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return {
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p0: [p0[0]/this._ratio, p0[1]/this._ratio],
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p1: [p1[0]/this._ratio, p1[1]/this._ratio]
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}
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}
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// Old versions
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return {
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p0: p0,
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p1: p1
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}
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}
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/** Get a vector 3D for a feature
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* @private
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*/
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getFeature3D_(f, h) {
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var geom = this.get('geometry')(f)
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var c = geom.getCoordinates()
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switch (geom.getType()) {
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case "Polygon":
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c = [c]
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// fallthrough
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case "MultiPolygon":
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var build = []
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for (var i = 0; i < c.length; i++) {
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for (var j = 0; j < c[i].length; j++) {
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var b = []
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for (var k = 0; k < c[i][j].length; k++) {
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b.push(this.hvector_(c[i][j][k], h))
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}
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build.push(b)
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}
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}
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return { type: "MultiPolygon", feature: f, geom: build }
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case "Point":
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return { type: "Point", feature: f, geom: this.hvector_(c, h) }
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default: return {}
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}
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}
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/** Draw 3D feature
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* @private
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*/
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drawFeature3D_(ctx, build) {
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var i, j, b, k
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// Construct
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for (i = 0; i < build.length; i++) {
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switch (build[i].type) {
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case "MultiPolygon": {
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for (j = 0; j < build[i].geom.length; j++) {
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b = build[i].geom[j]
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for (k = 0; k < b.length; k++) {
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ctx.beginPath()
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ctx.moveTo(b[k].p0[0], b[k].p0[1])
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ctx.lineTo(b[k].p1[0], b[k].p1[1])
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ctx.stroke()
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}
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}
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break
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}
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case "Point": {
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var g = build[i].geom
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ctx.beginPath()
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ctx.moveTo(g.p0[0], g.p0[1])
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ctx.lineTo(g.p1[0], g.p1[1])
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ctx.stroke()
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break
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}
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default: break
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}
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}
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// Roof
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for (i = 0; i < build.length; i++) {
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switch (build[i].type) {
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case "MultiPolygon": {
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ctx.beginPath()
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for (j = 0; j < build[i].geom.length; j++) {
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b = build[i].geom[j]
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if (j == 0) {
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ctx.moveTo(b[0].p1[0], b[0].p1[1])
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for (k = 1; k < b.length; k++) {
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ctx.lineTo(b[k].p1[0], b[k].p1[1])
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}
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} else {
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ctx.moveTo(b[0].p1[0], b[0].p1[1])
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for (k = b.length - 2; k >= 0; k--) {
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ctx.lineTo(b[k].p1[0], b[k].p1[1])
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}
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}
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ctx.closePath()
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}
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ctx.fill("evenodd")
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ctx.stroke()
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break
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}
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case "Point": {
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b = build[i]
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var t = b.feature.get('label')
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if (t) {
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var p = b.geom.p1
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var m = ctx.measureText(t)
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var h = Number(ctx.font.match(/\d+(\.\d+)?/g).join([]))
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ctx.fillRect(p[0] - m.width / 2 - 5, p[1] - h - 5, m.width + 10, h + 10)
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ctx.strokeRect(p[0] - m.width / 2 - 5, p[1] - h - 5, m.width + 10, h + 10)
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ctx.save()
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ctx.fillStyle = ol_color_asString(this._style.getText().getFill().getColor())
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ctx.textAlign = 'center'
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ctx.textBaseline = 'bottom'
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ctx.fillText(t, p[0], p[1])
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ctx.restore()
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}
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break
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}
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default: break
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}
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}
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}
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}
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export default ol_layer_Vector3D
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