104 lines
2.5 KiB
JavaScript
104 lines
2.5 KiB
JavaScript
goog.provide('ol.renderer.Composite');
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goog.require('ol.renderer.MapRenderer');
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goog.require('ol.layer.Layer');
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goog.require('ol.Loc');
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/**
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* @constructor
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* @param {!Element} container
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* @extends {ol.renderer.MapRenderer}
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*/
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ol.renderer.Composite = function(container) {
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goog.base(this, container);
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/**
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* @type Array.<ol.renderer.LayerRenderer>
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* @private
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*/
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this.renderers_ = [];
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};
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goog.inherits(ol.renderer.Composite, ol.renderer.MapRenderer);
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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.Composite.prototype.draw = function(layers, center, resolution, animate) {
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};
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/**
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* @param {ol.layer.Layer} layer
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*/
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ol.renderer.Composite.prototype.getRenderer = function(layer) {
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function finder(candidate) {
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return candidate.getLayer() === layer;
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}
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return goog.array.find(this.renderers_, finder);
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};
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/**
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* @param {ol.layer.Layer} layer
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*/
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ol.renderer.Composite.prototype.createRenderer = function(layer) {
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};
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/**
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* List of preferred renderer types. Layer renderers have a getType method
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* that returns a string describing their type. This list determines the
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* preferences for picking a layer renderer.
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*
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* @type {Array.<string>}
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*/
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ol.renderer.Composite.preferredRenderers = ["svg", "canvas", "vml"];
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/**
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* @param {ol.layer.Layer} layer
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* @returns {Function}
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*/
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ol.renderer.Composite.prototype.pickRendererType = function(layer) {
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// maps 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() && Candidate.canRender(layer);
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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.some(ol.renderer.Composite.registry_, picker);
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// check to see if any preferred renderers are available
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var preferences = ol.renderer.Composite.preferredRenderers;
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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 = 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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/**
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* @type {Array.<Function>}
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* @private
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*/
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ol.renderer.Composite.registry_ = [];
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/**
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* @param {Function} Renderer
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*/
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ol.renderer.Composite.register = function(Renderer) {
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ol.renderer.Composite.registry_.push(Renderer);
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};
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