70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
goog.provide('ol.renderer.MapRenderer');
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/**
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* @constructor
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* @param {!Element} container
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*/
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ol.renderer.MapRenderer = function(container) {
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/**
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* @type !Element
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* @protected
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*/
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this.container_ = container;
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};
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/**
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* @param {Array.<ol.layer.Layer>} layers
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* @param {ol.Loc} center
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* @param {number} resolution
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* @param {boolean} animate
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*/
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ol.renderer.MapRenderer.prototype.draw = function(layers, center, resolution, animate) {
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};
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/**
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* TODO: determine a closure friendly way to register map renderers.
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* @type {Array}
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* @private
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*/
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ol.renderer.MapRenderer.registry_ = [];
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/**
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* @param {Function} Renderer
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*/
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ol.renderer.MapRenderer.register = function(Renderer) {
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ol.renderer.MapRenderer.registry_.push(Renderer);
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};
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/**
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* @param {Array.<string>} preferences List of preferred renderer types.
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* @returns {Function} A renderer constructor.
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*/
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ol.renderer.MapRenderer.pickRendererType = function(preferences) {
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// map of candidate renderer types to candidate renderers
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var types = {};
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function picker(Candidate) {
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var supports = Candidate.isSupported();
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if (supports) {
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types[Candidate.getType()] = Candidate;
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}
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return supports;
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}
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var Candidates = goog.array.filter(ol.renderer.MapRenderer.registry_, picker);
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// check to see if any preferred renderers are available
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var Renderer;
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for (var i=0, ii=preferences.length; i<ii; ++i) {
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Renderer = types[preferences[i]];
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if (Renderer) {
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break;
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}
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}
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// if we didn't find any of the preferred renderers, use the first
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return Renderer || Candidates[0] || null;
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};
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