Move vector code out of the way
This commit is contained in:
Tom Payne
@@ -1,581 +0,0 @@
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goog.provide('ol.renderer.canvas.VectorLayer');
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goog.require('goog.asserts');
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goog.require('goog.dom');
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goog.require('goog.dom.TagName');
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goog.require('goog.events');
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goog.require('goog.object');
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goog.require('goog.vec.Mat4');
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goog.require('ol.Pixel');
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goog.require('ol.TileCache');
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goog.require('ol.TileCoord');
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goog.require('ol.TileRange');
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goog.require('ol.ViewHint');
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goog.require('ol.extent');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.layer.Vector');
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goog.require('ol.layer.VectorEventType');
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goog.require('ol.layer.VectorLayerRenderIntent');
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goog.require('ol.renderer.canvas.Layer');
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goog.require('ol.renderer.canvas.Vector');
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goog.require('ol.tilegrid.TileGrid');
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/**
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* Resolution at zoom level 21 in a web mercator default tiling scheme. This
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* is a workaround for browser bugs that cause line segments to disappear when
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* they get too long. TODO: Use line clipping as a better work around. See
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* https://github.com/openlayers/ol3/issues/404.
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*
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* @define {number} The lowest supported resolution value.
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*/
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ol.renderer.canvas.MIN_RESOLUTION = 0.14929107086948487;
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/**
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* @constructor
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* @extends {ol.renderer.canvas.Layer}
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* @param {ol.renderer.Map} mapRenderer Map renderer.
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* @param {ol.layer.Vector} layer Vector layer.
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*/
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ol.renderer.canvas.VectorLayer = function(mapRenderer, layer) {
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goog.base(this, mapRenderer, layer);
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/**
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* Final canvas made available to the map renderer.
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.canvas_ = /** @type {HTMLCanvasElement} */
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(goog.dom.createElement(goog.dom.TagName.CANVAS));
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/**
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* @private
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* @type {CanvasRenderingContext2D}
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*/
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this.context_ = /** @type {CanvasRenderingContext2D} */
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(this.canvas_.getContext('2d'));
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/**
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* @private
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* @type {!goog.vec.Mat4.Number}
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*/
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this.transform_ = goog.vec.Mat4.createNumber();
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/**
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* Interim canvas for drawing newly visible features.
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.sketchCanvas_ = /** @type {HTMLCanvasElement} */
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(goog.dom.createElement(goog.dom.TagName.CANVAS));
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/**
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* @private
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* @type {!goog.vec.Mat4.Number}
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*/
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this.sketchTransform_ = goog.vec.Mat4.createNumber();
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/**
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* Tile cache entries are arrays. The first item in each array is the tile
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* itself, the second are the symbol sizes, and the third is the maximum
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* symbol size.
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*
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* @private
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* @type {ol.TileCache}
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*/
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this.tileCache_ = new ol.TileCache(
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ol.renderer.canvas.VectorLayer.TILECACHE_SIZE);
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goog.events.listen(layer, [
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ol.layer.VectorEventType.ADD,
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ol.layer.VectorEventType.CHANGE,
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ol.layer.VectorEventType.REMOVE,
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ol.layer.VectorEventType.INTENTCHANGE
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],
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this.handleLayerChange_, false, this);
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/**
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.tileArchetype_ = null;
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/**
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* The maximum symbol size ever rendered for this layer (in pixels).
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* @private
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* @type {number}
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*/
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this.maxSymbolPixelDim_ = 0;
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/**
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* @private
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* @type {number}
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*/
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this.renderedResolution_;
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.renderedExtent_ = null;
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/**
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* Flag to be set internally when we know something has changed that suggests
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* we need to re-render.
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* TODO: discuss setting this for all layers when something changes before
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* calling map.render().
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* @private
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* @type {boolean}
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*/
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this.dirty_ = false;
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/**
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* @private
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* @type {boolean}
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*/
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this.pendingCachePrune_ = false;
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/**
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* Grid used for internal generation of canvas tiles. This is created
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* lazily so we have access to the view projection.
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*
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* @private
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* @type {ol.tilegrid.TileGrid}
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*/
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this.tileGrid_ = null;
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/**
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* Tile range before the current animation or interaction. This is updated
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* whenever the view is idle.
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*
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* @private
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* @type {ol.TileRange}
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*/
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this.tileRange_ = new ol.TileRange(NaN, NaN, NaN, NaN);
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/**
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* @private
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* @type {function()}
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*/
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this.requestMapRenderFrame_ = goog.bind(function() {
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this.dirty_ = true;
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mapRenderer.getMap().requestRenderFrame();
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}, this);
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};
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goog.inherits(ol.renderer.canvas.VectorLayer, ol.renderer.canvas.Layer);
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/**
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* Get rid cached tiles. If the optional extent is provided, only tiles that
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* intersect that extent will be removed.
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* @param {Array.<ol.Extent>} extents extent Expire tiles within the provided
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* extents. If the array is empty, all tiles will be expired.
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* @private
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*/
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ol.renderer.canvas.VectorLayer.prototype.expireTiles_ = function(extents) {
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// buffer by max symbolizer size at rendered resolution
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var resolution = this.renderedResolution_;
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goog.asserts.assertNumber(resolution);
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var tileCache = this.tileCache_;
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var length = extents.length;
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var extent;
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if (length > 0) {
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for (var i = 0; i < length; ++i) {
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extent = ol.extent.clone(extents[i]);
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ol.extent.buffer(extent, this.maxSymbolPixelDim_ * resolution / 2);
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tileCache.pruneTileRange(
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this.tileGrid_.getTileRangeForExtentAndZ(extent, 0));
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}
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} else {
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tileCache.clear();
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}
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.canvas.VectorLayer.prototype.getImage = function() {
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return this.canvas_;
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};
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/**
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* @return {ol.layer.Vector} Vector layer.
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*/
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ol.renderer.canvas.VectorLayer.prototype.getVectorLayer = function() {
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return /** @type {ol.layer.Vector} */ (this.getLayer());
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.canvas.VectorLayer.prototype.getTransform = function() {
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return this.transform_;
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};
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/**
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* @param {ol.Pixel} pixel Pixel coordinate relative to the map viewport.
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* @param {function(string, ol.layer.Layer)} success Callback for
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* successful queries. The passed arguments are the resulting feature
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* information and the layer.
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*/
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ol.renderer.canvas.VectorLayer.prototype.getFeatureInfoForPixel =
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function(pixel, success) {
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var callback = function(features, layer) {
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success(layer.getTransformFeatureInfo()(features), layer);
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};
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this.getFeaturesForPixel(pixel, callback);
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};
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/**
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* @param {ol.Pixel} pixel Pixel coordinate relative to the map viewport.
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* @param {function(Array.<ol.Feature>, ol.layer.Layer)} success Callback for
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* successful queries. The passed arguments are the resulting features
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* and the layer.
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* @param {function()=} opt_error Callback for unsuccessful queries.
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*/
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ol.renderer.canvas.VectorLayer.prototype.getFeaturesForPixel =
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function(pixel, success, opt_error) {
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// TODO What do we want to pass to the error callback?
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var map = this.getMap();
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var result = [];
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var layer = this.getLayer();
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var location = map.getCoordinateFromPixel(pixel);
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var tileCoord = this.tileGrid_.getTileCoordForCoordAndZ(location, 0);
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var key = tileCoord.toString();
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if (this.tileCache_.containsKey(key)) {
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var cachedTile = this.tileCache_.get(key);
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var symbolSizes = cachedTile[1];
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var maxSymbolSize = cachedTile[2];
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var symbolOffsets = cachedTile[3];
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var halfMaxWidth = maxSymbolSize[0] / 2;
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var halfMaxHeight = maxSymbolSize[1] / 2;
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var locationMin = [location[0] - halfMaxWidth, location[1] - halfMaxHeight];
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var locationMax = [location[0] + halfMaxWidth, location[1] + halfMaxHeight];
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var locationBbox = ol.extent.boundingExtent([locationMin, locationMax]);
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var candidates = layer.getFeaturesObjectForExtent(locationBbox,
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map.getView().getView2D().getProjection());
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if (goog.isNull(candidates)) {
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// data is not loaded
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if (goog.isDef(opt_error)) {
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goog.global.setTimeout(function() { opt_error(); }, 0);
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}
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return;
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}
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var candidate, geom, type, symbolBounds, symbolSize, symbolOffset,
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halfWidth, halfHeight, uid, coordinates, j;
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for (var id in candidates) {
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candidate = candidates[id];
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if (candidate.getRenderIntent() ==
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ol.layer.VectorLayerRenderIntent.HIDDEN) {
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continue;
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}
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geom = candidate.getGeometry();
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type = geom.getType();
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if (type === ol.geom.GeometryType.POINT ||
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type === ol.geom.GeometryType.MULTIPOINT) {
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// For points, check if the pixel coordinate is inside the candidate's
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// symbol
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uid = goog.getUid(candidate);
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symbolSize = symbolSizes[uid];
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symbolOffset = symbolOffsets[uid];
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halfWidth = symbolSize[0] / 2;
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halfHeight = symbolSize[1] / 2;
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symbolBounds = ol.extent.boundingExtent([
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[location[0] - halfWidth - symbolOffset[0],
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location[1] - halfHeight + symbolOffset[1]],
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[location[0] + halfWidth - symbolOffset[0],
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location[1] + halfHeight + symbolOffset[1]]
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]);
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coordinates = geom.getCoordinates();
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if (!goog.isArray(coordinates[0])) {
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coordinates = [coordinates];
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}
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for (j = coordinates.length - 1; j >= 0; --j) {
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if (ol.extent.containsCoordinate(symbolBounds, coordinates[j])) {
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result.push(candidate);
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break;
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}
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}
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} else if (goog.isFunction(geom.containsCoordinate)) {
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// For polygons, check if the pixel location is inside the polygon
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if (geom.containsCoordinate(location)) {
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result.push(candidate);
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}
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} else if (goog.isFunction(geom.distanceFromCoordinate)) {
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// For lines, check if the distance to the pixel location is
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// within the rendered line width
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if (2 * geom.distanceFromCoordinate(location) <=
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symbolSizes[goog.getUid(candidate)][0]) {
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result.push(candidate);
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}
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}
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}
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}
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goog.global.setTimeout(function() { success(result, layer); }, 0);
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};
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/**
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* @param {ol.layer.VectorEvent} event Vector layer event.
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* @private
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*/
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ol.renderer.canvas.VectorLayer.prototype.handleLayerChange_ = function(event) {
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if (goog.isDef(this.renderedResolution_)) {
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this.expireTiles_(event.extents);
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}
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this.requestMapRenderFrame_();
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.canvas.VectorLayer.prototype.prepareFrame =
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function(frameState, layerState) {
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// TODO: consider bailing out here if rendered center and resolution
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// have not changed. Requires that other change listeners set a dirty flag.
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var view2DState = frameState.view2DState,
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resolution = view2DState.resolution,
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projection = view2DState.projection,
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extent = frameState.extent,
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layer = this.getVectorLayer(),
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tileGrid = this.tileGrid_,
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tileSize = [512, 512],
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idle = !frameState.viewHints[ol.ViewHint.ANIMATING] &&
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!frameState.viewHints[ol.ViewHint.INTERACTING];
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// lazy tile grid creation
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if (idle) {
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// avoid rendering issues for very high zoom levels
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var minResolution = ol.renderer.canvas.MIN_RESOLUTION;
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var metersPerUnit = projection.getMetersPerUnit();
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if (metersPerUnit) {
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minResolution = minResolution / metersPerUnit;
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}
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var gridResolution = Math.max(resolution, minResolution);
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if (gridResolution !== this.renderedResolution_) {
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tileGrid = new ol.tilegrid.TileGrid({
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origin: [0, 0],
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projection: projection,
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resolutions: [gridResolution],
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tileSize: tileSize
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});
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this.tileCache_.clear();
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this.tileGrid_ = tileGrid;
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}
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}
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if (goog.isNull(tileGrid)) {
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// We should only get here when the first call to prepareFrame happens
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// during an animation. Try again in the next prepareFrame call.
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return;
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}
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// set up transform for the layer canvas to be drawn to the map canvas
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var tileResolution = tileGrid.getResolution(0);
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if (idle) {
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tileGrid.getTileRangeForExtentAndResolution(
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extent, tileResolution, this.tileRange_);
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}
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var transform = this.transform_,
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tileRange = this.tileRange_,
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tileRangeExtent = tileGrid.getTileRangeExtent(0, tileRange),
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sketchOrigin = ol.extent.getTopLeft(tileRangeExtent);
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goog.vec.Mat4.makeIdentity(transform);
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goog.vec.Mat4.translate(transform,
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frameState.size[0] / 2,
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frameState.size[1] / 2,
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0);
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goog.vec.Mat4.scale(transform,
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tileResolution / resolution, tileResolution / resolution, 1);
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goog.vec.Mat4.rotateZ(transform, view2DState.rotation);
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goog.vec.Mat4.translate(transform,
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(sketchOrigin[0] - view2DState.center[0]) / tileResolution,
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(view2DState.center[1] - sketchOrigin[1]) / tileResolution,
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0);
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/**
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* Fastest path out of here. This method is called many many times while
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* there is nothing to do (e.g. while waiting for tiles from every other
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* layer to load.) Do not put anything above here that is more expensive than
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* necessary. And look for ways to get here faster.
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*/
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if (!this.dirty_ && this.renderedResolution_ === tileResolution &&
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ol.extent.equals(this.renderedExtent_, tileRangeExtent)) {
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return;
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}
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if (goog.isNull(this.tileArchetype_)) {
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this.tileArchetype_ = /** @type {HTMLCanvasElement} */
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(goog.dom.createElement(goog.dom.TagName.CANVAS));
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this.tileArchetype_.width = tileSize[0];
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this.tileArchetype_.height = tileSize[1];
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}
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/**
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* Prepare the sketch canvas. This covers the currently visible tile range
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* and will have rendered all newly visible features.
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*/
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var sketchCanvas = this.sketchCanvas_;
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var sketchWidth = tileSize[0] * tileRange.getWidth();
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var sketchHeight = tileSize[1] * tileRange.getHeight();
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// transform for map coords to sketch canvas pixel coords
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var sketchTransform = this.sketchTransform_;
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var halfWidth = sketchWidth / 2;
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var halfHeight = sketchHeight / 2;
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goog.vec.Mat4.makeIdentity(sketchTransform);
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goog.vec.Mat4.translate(sketchTransform,
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halfWidth,
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halfHeight,
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0);
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goog.vec.Mat4.scale(sketchTransform,
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1 / tileResolution,
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-1 / tileResolution,
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1);
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goog.vec.Mat4.translate(sketchTransform,
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||||
-(sketchOrigin[0] + halfWidth * tileResolution),
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-(sketchOrigin[1] - halfHeight * tileResolution),
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0);
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||||
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||||
// clear/resize sketch canvas
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||||
sketchCanvas.width = sketchWidth;
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||||
sketchCanvas.height = sketchHeight;
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||||
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||||
var sketchContext = /** @type {CanvasRenderingContext2D} */
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||||
(sketchCanvas.getContext('2d'));
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||||
var sketchCanvasRenderer = new ol.renderer.canvas.Vector(
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sketchContext, sketchTransform, this.requestMapRenderFrame_);
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||||
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||||
// clear/resize final canvas
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||||
var finalCanvas = this.canvas_;
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||||
finalCanvas.width = sketchWidth;
|
||||
finalCanvas.height = sketchHeight;
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||||
var finalContext = this.context_;
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||||
|
||||
var featuresToRender = {};
|
||||
var tilesToRender = {};
|
||||
var tilesOnSketchCanvas = {};
|
||||
// TODO make gutter configurable?
|
||||
var tileGutter = 15 * tileResolution;
|
||||
var tile, tileCoord, key, x, y, i, type;
|
||||
var deferred = false;
|
||||
var dirty = false;
|
||||
var tileExtent, groups, group, j, numGroups, featuresObject, tileHasFeatures;
|
||||
fetchTileData:
|
||||
for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
|
||||
for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
|
||||
tileCoord = new ol.TileCoord(0, x, y);
|
||||
key = tileCoord.toString();
|
||||
if (this.tileCache_.containsKey(key)) {
|
||||
tilesToRender[key] = tileCoord;
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||||
} else if (idle) {
|
||||
tileExtent = tileGrid.getTileCoordExtent(tileCoord);
|
||||
tileExtent[0] -= tileGutter;
|
||||
tileExtent[2] += tileGutter;
|
||||
tileExtent[1] -= tileGutter;
|
||||
tileExtent[3] += tileGutter;
|
||||
tileHasFeatures = false;
|
||||
featuresObject = layer.getFeaturesObjectForExtent(tileExtent,
|
||||
projection, this.requestMapRenderFrame_);
|
||||
if (goog.isNull(featuresObject)) {
|
||||
deferred = true;
|
||||
break fetchTileData;
|
||||
}
|
||||
tileHasFeatures = tileHasFeatures ||
|
||||
!goog.object.isEmpty(featuresObject);
|
||||
goog.object.extend(featuresToRender, featuresObject);
|
||||
if (tileHasFeatures) {
|
||||
tilesOnSketchCanvas[key] = tileCoord;
|
||||
}
|
||||
} else {
|
||||
dirty = true;
|
||||
}
|
||||
}
|
||||
}
|
||||
this.dirty_ = dirty;
|
||||
|
||||
groups = layer.groupFeaturesBySymbolizerLiteral(featuresToRender,
|
||||
tileResolution);
|
||||
numGroups = groups.length;
|
||||
for (j = 0; j < numGroups; ++j) {
|
||||
group = groups[j];
|
||||
deferred = sketchCanvasRenderer.renderFeatures(group[0], group[1],
|
||||
group[2]);
|
||||
if (deferred) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!deferred) {
|
||||
goog.object.extend(tilesToRender, tilesOnSketchCanvas);
|
||||
}
|
||||
|
||||
var symbolSizes = sketchCanvasRenderer.getSymbolSizes(),
|
||||
maxSymbolSize = sketchCanvasRenderer.getMaxSymbolSize(),
|
||||
symbolOffsets = sketchCanvasRenderer.getSymbolOffsets();
|
||||
|
||||
// keep track of maximum pixel size for symbols rendered on this layer
|
||||
this.maxSymbolPixelDim_ = Math.max(maxSymbolSize[0] / tileResolution,
|
||||
maxSymbolSize[1] / tileResolution);
|
||||
|
||||
for (key in tilesToRender) {
|
||||
tileCoord = tilesToRender[key];
|
||||
if (this.tileCache_.containsKey(key)) {
|
||||
tile = /** @type {HTMLCanvasElement} */ (this.tileCache_.get(key)[0]);
|
||||
} else {
|
||||
tile = /** @type {HTMLCanvasElement} */
|
||||
(this.tileArchetype_.cloneNode(false));
|
||||
tile.getContext('2d').drawImage(sketchCanvas,
|
||||
(tileRange.minX - tileCoord.x) * tileSize[0],
|
||||
(tileCoord.y - tileRange.maxY) * tileSize[1]);
|
||||
// TODO: Create an ol.VectorTile subclass of ol.Tile
|
||||
this.tileCache_.set(key,
|
||||
[tile, symbolSizes, maxSymbolSize, symbolOffsets]);
|
||||
}
|
||||
finalContext.drawImage(tile,
|
||||
tileSize[0] * (tileCoord.x - tileRange.minX),
|
||||
tileSize[1] * (tileRange.maxY - tileCoord.y));
|
||||
}
|
||||
|
||||
this.renderedResolution_ = tileResolution;
|
||||
this.renderedExtent_ = tileRangeExtent;
|
||||
if (!this.pendingCachePrune_) {
|
||||
this.pendingCachePrune_ = true;
|
||||
frameState.postRenderFunctions.push(goog.bind(this.pruneTileCache_, this));
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Get rid of tiles that exceed the cache capacity.
|
||||
* TODO: add a method to the cache to handle this
|
||||
* @private
|
||||
*/
|
||||
ol.renderer.canvas.VectorLayer.prototype.pruneTileCache_ = function() {
|
||||
while (this.tileCache_.canExpireCache()) {
|
||||
this.tileCache_.pop();
|
||||
}
|
||||
this.pendingCachePrune_ = false;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
*/
|
||||
ol.renderer.canvas.VectorLayer.TILECACHE_SIZE = 128;
|
||||
Reference in New Issue
Block a user