119 lines
3.5 KiB
JavaScript
119 lines
3.5 KiB
JavaScript
import { DeepZoomMap } from './map.js'
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/**
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* The MapView class is responsible for a consistent map view.
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* It is aware of the current viewposition, the scale and viewport.
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* It ensures, that maps can be changed, without the user noticing it.
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*
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*/
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export default class MapViewport {
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/**
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*
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* @param {object} [focus = {x:0, y:0}] - Defines the startup focuspoint of the app.
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* @param {number} [zoom = 0] - Defines the startup zoom of the app. Note that this is just a request.
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* The MapView will prioritize a full scale app, than displaying the demanded zoom factor
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*/
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constructor({ focus = null, zoom = null, viewport = { min: { x: -85, y: -180 }, max: { x: 85, y: 180 } } } = {}) {
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this.viewport = viewport
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this._focus = focus
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this._zoom = zoom
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this.referenceHeight = 256
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}
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get focus() {
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return this._focus
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}
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get zoom() {
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return this._zoom
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}
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apply(map) {
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map.moveTo(this._focus, this._zoom)
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}
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transformed(map) {
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this.updateZoom(map)
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this.updateFocusPoint(map)
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}
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updatePosition(map) {
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this.updateFocusPoint(map)
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this.updateZoom(map)
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}
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updateFocusPoint(map) {
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const frame = map.getFrame()
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this._focus = this.coordinatesFromWindowPoint(map, frame.localCenter)
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}
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updateZoom(map) {
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/**
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* TODO: This relies on the fact, that all maps have the same tileSize,
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* if a set would have a smaller tileSize. Improve that.
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*/
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if (map instanceof DeepZoomMap) this._zoom = map.floatingLevelForScale(map.image.scatter.scale)
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else {
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this._zoom = map.zoom
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}
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}
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mapPointToWindowPoint(map, point) {
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let windowPoint = { x: 0, y: 0 }
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if (map['image'] && map.image['parent']) {
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let container = map.image.parent
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windowPoint = new PIXI.Point(
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map.scatter.position.x + map.scatter.scale * point.x,
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map.scatter.position.y + map.scatter.scale * point.y
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)
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windowPoint = container.toGlobal(windowPoint)
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} else {
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console.error(this._noParentError)
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}
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return windowPoint
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}
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windowPointToMapPoint(map, point) {
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let pointOnMap = { x: 0, y: 0 }
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if (map['image'] && map.image['parent']) {
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let offset = map.image.parent.toGlobal({ x: 0, y: 0 })
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pointOnMap = new PIXI.Point(
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(point.x - map.scatter.position.x - offset.x) / map.scatter.scale,
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(point.y - map.scatter.position.y - offset.y) / map.scatter.scale
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)
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} else console.error(this._noParentError)
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return pointOnMap
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}
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get _noParentError() {
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return 'Cannot compute map point when map has no parent.'
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}
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/**
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* Gets the coordinates of a specific point in the viewport.
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*
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* @param {PIXI.Point | {x,y}} point - Pixel position in the viewport.
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* @returns {{x,y}} Coordinates on the map of the provided position.
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* @memberof MapView
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*/
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coordinatesFromWindowPoint(map, point) {
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let position = {
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x: point.x - map.scatter.position.x,
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y: point.y - map.scatter.position.y
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}
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let normalized = {
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x: position.x / (map.width * map.scatter.scale),
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y: position.y / (map.height * map.scatter.scale)
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}
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let coordinates = map.mapdata.toCoordinates(normalized)
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return coordinates
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}
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}
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