121 lines
2.9 KiB
JavaScript
121 lines
2.9 KiB
JavaScript
goog.provide('ol.source.TileDebug');
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goog.require('ol');
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goog.require('ol.Tile');
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goog.require('ol.TileState');
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goog.require('ol.dom');
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goog.require('ol.size');
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goog.require('ol.source.Tile');
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/**
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* @classdesc
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* A pseudo tile source, which does not fetch tiles from a server, but renders
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* a grid outline for the tile grid/projection along with the coordinates for
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* each tile. See examples/canvas-tiles for an example.
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*
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* Uses Canvas context2d, so requires Canvas support.
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*
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* @constructor
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* @extends {ol.source.Tile}
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* @param {olx.source.TileDebugOptions} options Debug tile options.
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* @api
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*/
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ol.source.TileDebug = function(options) {
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ol.source.Tile.call(this, {
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opaque: false,
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projection: options.projection,
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tileGrid: options.tileGrid,
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wrapX: options.wrapX !== undefined ? options.wrapX : true
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});
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};
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ol.inherits(ol.source.TileDebug, ol.source.Tile);
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/**
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* @inheritDoc
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*/
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ol.source.TileDebug.prototype.getTile = function(z, x, y) {
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var tileCoordKey = this.getKeyZXY(z, x, y);
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if (this.tileCache.containsKey(tileCoordKey)) {
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return /** @type {!ol.source.TileDebug.Tile_} */ (this.tileCache.get(tileCoordKey));
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} else {
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var tileSize = ol.size.toSize(this.tileGrid.getTileSize(z));
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var tileCoord = [z, x, y];
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var textTileCoord = this.getTileCoordForTileUrlFunction(tileCoord);
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var text = !textTileCoord ? '' :
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this.getTileCoordForTileUrlFunction(textTileCoord).toString();
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var tile = new ol.source.TileDebug.Tile_(tileCoord, tileSize, text);
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this.tileCache.set(tileCoordKey, tile);
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return tile;
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}
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};
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/**
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* @constructor
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* @extends {ol.Tile}
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {ol.Size} tileSize Tile size.
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* @param {string} text Text.
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* @private
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*/
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ol.source.TileDebug.Tile_ = function(tileCoord, tileSize, text) {
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ol.Tile.call(this, tileCoord, ol.TileState.LOADED);
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/**
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* @private
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* @type {ol.Size}
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*/
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this.tileSize_ = tileSize;
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/**
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* @private
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* @type {string}
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*/
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this.text_ = text;
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/**
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.canvas_ = null;
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};
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ol.inherits(ol.source.TileDebug.Tile_, ol.Tile);
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/**
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* Get the image element for this tile.
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* @return {HTMLCanvasElement} Image.
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*/
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ol.source.TileDebug.Tile_.prototype.getImage = function() {
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if (this.canvas_) {
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return this.canvas_;
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} else {
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var tileSize = this.tileSize_;
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var context = ol.dom.createCanvasContext2D(tileSize[0], tileSize[1]);
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context.strokeStyle = 'black';
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context.strokeRect(0.5, 0.5, tileSize[0] + 0.5, tileSize[1] + 0.5);
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context.fillStyle = 'black';
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context.textAlign = 'center';
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context.textBaseline = 'middle';
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context.font = '24px sans-serif';
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context.fillText(this.text_, tileSize[0] / 2, tileSize[1] / 2);
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this.canvas_ = context.canvas;
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return context.canvas;
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}
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};
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/**
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* @override
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*/
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ol.source.TileDebug.Tile_.prototype.load = function() {};
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