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image_source.js
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image_source.js
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// @flow
import { getCoordinatesCenter } from '../util/util';
import { CanonicalTileID } from './tile_id';
import LngLat from '../geo/lng_lat';
import Point from '@mapbox/point-geometry';
import { Event, ErrorEvent, Evented } from '../util/evented';
import { getImage, ResourceType } from '../util/ajax';
import browser from '../util/browser';
import EXTENT from '../data/extent';
import { RasterBoundsArray } from '../data/array_types';
import rasterBoundsAttributes from '../data/raster_bounds_attributes';
import VertexArrayObject from '../render/vertex_array_object';
import Texture from '../render/texture';
import type {Source} from './source';
import type {CanvasSourceSpecification} from './canvas_source';
import type Map from '../ui/map';
import type Dispatcher from '../util/dispatcher';
import type Tile from './tile';
import type Coordinate from '../geo/coordinate';
import type {Callback} from '../types/callback';
import type VertexBuffer from '../gl/vertex_buffer';
/**
* A data source containing an image.
* (See the [Style Specification](https://www.mapbox.com/mapbox-gl-style-spec/#sources-image) for detailed documentation of options.)
*
* @example
* // add to map
* map.addSource('some id', {
* type: 'image',
* url: 'https://www.mapbox.com/images/foo.png',
* coordinates: [
* [-76.54, 39.18],
* [-76.52, 39.18],
* [-76.52, 39.17],
* [-76.54, 39.17]
* ]
* });
*
* // update
* var mySource = map.getSource('some id');
* mySource.setCoordinates([
* [-76.54335737228394, 39.18579907229748],
* [-76.52803659439087, 39.1838364847587],
* [-76.5295386314392, 39.17683392507606],
* [-76.54520273208618, 39.17876344106642]
* ]);
*
* map.removeSource('some id'); // remove
* @see [Add an image](https://www.mapbox.com/mapbox-gl-js/example/image-on-a-map/)
*/
class ImageSource extends Evented implements Source {
type: string;
id: string;
minzoom: number;
maxzoom: number;
tileSize: number;
url: string;
coordinates: [[number, number], [number, number], [number, number], [number, number]];
tiles: {[string]: Tile};
options: any;
dispatcher: Dispatcher;
map: Map;
texture: Texture;
image: ImageData;
centerCoord: Coordinate;
tileID: CanonicalTileID;
_boundsArray: RasterBoundsArray;
boundsBuffer: VertexBuffer;
boundsVAO: VertexArrayObject;
/**
* @private
*/
constructor(id: string, options: ImageSourceSpecification | VideoSourceSpecification | CanvasSourceSpecification, dispatcher: Dispatcher, eventedParent: Evented) {
super();
this.id = id;
this.dispatcher = dispatcher;
this.coordinates = options.coordinates;
this.type = 'image';
this.minzoom = 0;
this.maxzoom = 22;
this.tileSize = 512;
this.tiles = {};
this.setEventedParent(eventedParent);
this.options = options;
}
load() {
this.fire(new Event('dataloading', {dataType: 'source'}));
this.url = this.options.url;
getImage(this.map._transformRequest(this.url, ResourceType.Image), (err, image) => {
if (err) {
this.fire(new ErrorEvent(err));
} else if (image) {
this.image = browser.getImageData(image);
this._finishLoading();
}
});
}
_finishLoading() {
if (this.map) {
this.setCoordinates(this.coordinates);
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'metadata'}));
}
}
onAdd(map: Map) {
this.map = map;
this.load();
}
/**
* Sets the image's coordinates and re-renders the map.
*
* @param {Array<Array<number>>} coordinates Four geographical coordinates,
* represented as arrays of longitude and latitude numbers, which define the corners of the image.
* The coordinates start at the top left corner of the image and proceed in clockwise order.
* They do not have to represent a rectangle.
* @returns {ImageSource} this
*/
setCoordinates(coordinates: [[number, number], [number, number], [number, number], [number, number]]) {
this.coordinates = coordinates;
// Calculate which mercator tile is suitable for rendering the video in
// and create a buffer with the corner coordinates. These coordinates
// may be outside the tile, because raster tiles aren't clipped when rendering.
const map = this.map;
// transform the geo coordinates into (zoom 0) tile space coordinates
const cornerZ0Coords = coordinates.map((coord) => {
return map.transform.locationCoordinate(LngLat.convert(coord)).zoomTo(0);
});
// Compute the coordinates of the tile we'll use to hold this image's
// render data
const centerCoord = this.centerCoord = getCoordinatesCenter(cornerZ0Coords);
// `column` and `row` may be fractional; round them down so that they
// represent integer tile coordinates
centerCoord.column = Math.floor(centerCoord.column);
centerCoord.row = Math.floor(centerCoord.row);
this.tileID = new CanonicalTileID(centerCoord.zoom, centerCoord.column, centerCoord.row);
// Constrain min/max zoom to our tile's zoom level in order to force
// SourceCache to request this tile (no matter what the map's zoom
// level)
this.minzoom = this.maxzoom = centerCoord.zoom;
// Transform the corner coordinates into the coordinate space of our
// tile.
const tileCoords = cornerZ0Coords.map((coord) => {
const zoomedCoord = coord.zoomTo(centerCoord.zoom);
return new Point(
Math.round((zoomedCoord.column - centerCoord.column) * EXTENT),
Math.round((zoomedCoord.row - centerCoord.row) * EXTENT));
});
this._boundsArray = new RasterBoundsArray();
this._boundsArray.emplaceBack(tileCoords[0].x, tileCoords[0].y, 0, 0);
this._boundsArray.emplaceBack(tileCoords[1].x, tileCoords[1].y, EXTENT, 0);
this._boundsArray.emplaceBack(tileCoords[3].x, tileCoords[3].y, 0, EXTENT);
this._boundsArray.emplaceBack(tileCoords[2].x, tileCoords[2].y, EXTENT, EXTENT);
if (this.boundsBuffer) {
this.boundsBuffer.destroy();
delete this.boundsBuffer;
}
this.fire(new Event('data', {dataType:'source', sourceDataType: 'content'}));
return this;
}
prepare() {
if (Object.keys(this.tiles).length === 0 || !this.image) {
return;
}
const context = this.map.painter.context;
const gl = context.gl;
if (!this.boundsBuffer) {
this.boundsBuffer = context.createVertexBuffer(this._boundsArray, rasterBoundsAttributes.members);
}
if (!this.boundsVAO) {
this.boundsVAO = new VertexArrayObject();
}
if (!this.texture) {
this.texture = new Texture(context, this.image, gl.RGBA);
this.texture.bind(gl.LINEAR, gl.CLAMP_TO_EDGE);
}
for (const w in this.tiles) {
const tile = this.tiles[w];
if (tile.state !== 'loaded') {
tile.state = 'loaded';
tile.texture = this.texture;
}
}
}
loadTile(tile: Tile, callback: Callback<void>) {
// We have a single tile -- whoose coordinates are this.tileID -- that
// covers the image we want to render. If that's the one being
// requested, set it up with the image; otherwise, mark the tile as
// `errored` to indicate that we have no data for it.
// If the world wraps, we may have multiple "wrapped" copies of the
// single tile.
if (this.tileID && this.tileID.equals(tile.tileID.canonical)) {
this.tiles[String(tile.tileID.wrap)] = tile;
tile.buckets = {};
callback(null);
} else {
tile.state = 'errored';
callback(null);
}
}
serialize(): Object {
return {
type: 'image',
url: this.options.url,
coordinates: this.coordinates
};
}
hasTransition() {
return false;
}
}
export default ImageSource;