657 lines
14 KiB
JavaScript
657 lines
14 KiB
JavaScript
goog.provide('ol.style.Icon');
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goog.provide('ol.style.IconAnchorUnits');
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goog.provide('ol.style.IconImageCache');
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goog.provide('ol.style.IconOrigin');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.events');
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goog.require('goog.events.EventTarget');
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goog.require('goog.events.EventType');
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goog.require('ol.dom');
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goog.require('ol.style.Image');
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goog.require('ol.style.ImageState');
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/**
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* Icon anchor units. One of 'fraction', 'pixels'.
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* @enum {string}
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* @api
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*/
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ol.style.IconAnchorUnits = {
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FRACTION: 'fraction',
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PIXELS: 'pixels'
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};
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/**
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* Icon origin. One of 'bottom-left', 'bottom-right', 'top-left', 'top-right'.
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* @enum {string}
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* @api
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*/
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ol.style.IconOrigin = {
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BOTTOM_LEFT: 'bottom-left',
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BOTTOM_RIGHT: 'bottom-right',
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TOP_LEFT: 'top-left',
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TOP_RIGHT: 'top-right'
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};
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/**
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* @classdesc
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* Set icon style for vector features.
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*
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* @constructor
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* @param {olx.style.IconOptions=} opt_options Options.
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* @extends {ol.style.Image}
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* @api
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*/
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ol.style.Icon = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.anchor_ = goog.isDef(options.anchor) ? options.anchor : [0.5, 0.5];
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.normalizedAnchor_ = null;
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/**
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* @private
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* @type {ol.style.IconOrigin}
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*/
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this.anchorOrigin_ = goog.isDef(options.anchorOrigin) ?
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options.anchorOrigin : ol.style.IconOrigin.TOP_LEFT;
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/**
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* @private
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* @type {ol.style.IconAnchorUnits}
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*/
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this.anchorXUnits_ = goog.isDef(options.anchorXUnits) ?
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options.anchorXUnits : ol.style.IconAnchorUnits.FRACTION;
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/**
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* @private
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* @type {ol.style.IconAnchorUnits}
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*/
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this.anchorYUnits_ = goog.isDef(options.anchorYUnits) ?
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options.anchorYUnits : ol.style.IconAnchorUnits.FRACTION;
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/**
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* @type {?string}
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*/
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var crossOrigin =
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goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
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/**
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* @type {Image}
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*/
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var image = goog.isDef(options.img) ? options.img : null;
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/**
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* @type {string|undefined}
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*/
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var src = options.src;
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if ((!goog.isDef(src) || src.length === 0) && !goog.isNull(image)) {
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src = image.src;
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}
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goog.asserts.assert(goog.isDef(src) && src.length > 0);
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/**
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* @type {ol.style.ImageState}
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*/
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var imageState = goog.isDef(options.src) ?
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ol.style.ImageState.IDLE : ol.style.ImageState.LOADED;
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/**
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* @private
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* @type {ol.style.IconImage_}
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*/
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this.iconImage_ = ol.style.IconImage_.get(
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image, src, crossOrigin, imageState);
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.offset_ = goog.isDef(options.offset) ? options.offset : [0, 0];
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/**
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* @private
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* @type {ol.style.IconOrigin}
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*/
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this.offsetOrigin_ = goog.isDef(options.offsetOrigin) ?
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options.offsetOrigin : ol.style.IconOrigin.TOP_LEFT;
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.origin_ = null;
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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.size_ = goog.isDef(options.size) ? options.size : null;
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/**
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* @type {number}
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*/
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var opacity = goog.isDef(options.opacity) ? options.opacity : 1;
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/**
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* @type {boolean}
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*/
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var rotateWithView = goog.isDef(options.rotateWithView) ?
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options.rotateWithView : false;
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/**
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* @type {number}
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*/
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var rotation = goog.isDef(options.rotation) ? options.rotation : 0;
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/**
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* @type {number}
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*/
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var scale = goog.isDef(options.scale) ? options.scale : 1;
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/**
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* @type {boolean}
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*/
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var snapToPixel = goog.isDef(options.snapToPixel) ?
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options.snapToPixel : true;
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goog.base(this, {
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opacity: opacity,
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rotation: rotation,
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scale: scale,
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snapToPixel: snapToPixel,
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rotateWithView: rotateWithView
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});
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};
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goog.inherits(ol.style.Icon, ol.style.Image);
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/**
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* @inheritDoc
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* @api
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*/
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ol.style.Icon.prototype.getAnchor = function() {
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if (!goog.isNull(this.normalizedAnchor_)) {
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return this.normalizedAnchor_;
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}
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var anchor = this.anchor_;
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var size = this.getSize();
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if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION ||
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this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
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if (goog.isNull(size)) {
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return null;
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}
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anchor = this.anchor_.slice();
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if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION) {
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anchor[0] *= size[0];
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}
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if (this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
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anchor[1] *= size[1];
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}
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}
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if (this.anchorOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
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if (goog.isNull(size)) {
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return null;
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}
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if (anchor === this.anchor_) {
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anchor = this.anchor_.slice();
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}
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if (this.anchorOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
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this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
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anchor[0] = -anchor[0] + size[0];
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}
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if (this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
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this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
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anchor[1] = -anchor[1] + size[1];
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}
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}
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this.normalizedAnchor_ = anchor;
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return this.normalizedAnchor_;
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};
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/**
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* @param {number} pixelRatio Pixel ratio.
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* @return {Image} Image element.
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* @api
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*/
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ol.style.Icon.prototype.getImage = function(pixelRatio) {
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return this.iconImage_.getImage(pixelRatio);
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};
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/**
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* Real Image size used.
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* @return {ol.Size} Size.
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*/
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ol.style.Icon.prototype.getImageSize = function() {
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return this.iconImage_.getSize();
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.getHitDetectionImageSize = function() {
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return this.getImageSize();
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.getImageState = function() {
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return this.iconImage_.getImageState();
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.getHitDetectionImage = function(pixelRatio) {
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return this.iconImage_.getHitDetectionImage(pixelRatio);
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};
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/**
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* @inheritDoc
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* @api
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*/
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ol.style.Icon.prototype.getOrigin = function() {
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if (!goog.isNull(this.origin_)) {
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return this.origin_;
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}
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var offset = this.offset_;
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if (this.offsetOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
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var size = this.getSize();
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var iconImageSize = this.iconImage_.getSize();
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if (goog.isNull(size) || goog.isNull(iconImageSize)) {
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return null;
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}
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offset = offset.slice();
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if (this.offsetOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
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this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
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offset[0] = iconImageSize[0] - size[0] - offset[0];
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}
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if (this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
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this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
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offset[1] = iconImageSize[1] - size[1] - offset[1];
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}
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}
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this.origin_ = offset;
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return this.origin_;
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.getHitDetectionOrigin = function() {
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return this.getOrigin();
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};
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/**
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* @return {string|undefined} Image src.
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* @api
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*/
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ol.style.Icon.prototype.getSrc = function() {
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return this.iconImage_.getSrc();
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};
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/**
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* @inheritDoc
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* @api
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*/
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ol.style.Icon.prototype.getSize = function() {
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return goog.isNull(this.size_) ? this.iconImage_.getSize() : this.size_;
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.listenImageChange = function(listener, thisArg) {
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return goog.events.listen(this.iconImage_, goog.events.EventType.CHANGE,
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listener, false, thisArg);
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};
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/**
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* Load not yet loaded URI.
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*/
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ol.style.Icon.prototype.load = function() {
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this.iconImage_.load();
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};
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/**
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* @inheritDoc
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*/
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ol.style.Icon.prototype.unlistenImageChange = function(listener, thisArg) {
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goog.events.unlisten(this.iconImage_, goog.events.EventType.CHANGE,
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listener, false, thisArg);
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};
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/**
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* @constructor
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* @param {Image} image Image.
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* @param {string|undefined} src Src.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.style.ImageState} imageState Image state.
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* @extends {goog.events.EventTarget}
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* @private
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*/
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ol.style.IconImage_ = function(image, src, crossOrigin, imageState) {
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goog.base(this);
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/**
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* @private
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* @type {Image|HTMLCanvasElement}
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*/
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this.hitDetectionImage_ = null;
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/**
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* @private
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* @type {Image}
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*/
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this.image_ = goog.isNull(image) ? new Image() : image;
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if (!goog.isNull(crossOrigin)) {
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this.image_.crossOrigin = crossOrigin;
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}
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.imageListenerKeys_ = null;
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/**
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* @private
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* @type {ol.style.ImageState}
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*/
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this.imageState_ = imageState;
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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.size_ = null;
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/**
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* @private
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* @type {string|undefined}
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*/
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this.src_ = src;
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/**
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* @private
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* @type {boolean}
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*/
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this.tainting_ = false;
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};
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goog.inherits(ol.style.IconImage_, goog.events.EventTarget);
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/**
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* @param {Image} image Image.
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* @param {string} src Src.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.style.ImageState} imageState Image state.
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* @return {ol.style.IconImage_} Icon image.
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*/
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ol.style.IconImage_.get = function(image, src, crossOrigin, imageState) {
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var iconImageCache = ol.style.IconImageCache.getInstance();
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var iconImage = iconImageCache.get(src, crossOrigin);
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if (goog.isNull(iconImage)) {
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iconImage = new ol.style.IconImage_(image, src, crossOrigin, imageState);
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iconImageCache.set(src, crossOrigin, iconImage);
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}
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return iconImage;
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};
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/**
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* @private
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*/
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ol.style.IconImage_.prototype.determineTainting_ = function() {
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var context = ol.dom.createCanvasContext2D(1, 1);
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context.drawImage(this.image_, 0, 0);
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try {
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context.getImageData(0, 0, 1, 1);
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} catch (e) {
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this.tainting_ = true;
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}
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};
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/**
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* @private
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*/
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ol.style.IconImage_.prototype.dispatchChangeEvent_ = function() {
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this.dispatchEvent(goog.events.EventType.CHANGE);
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};
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/**
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* @private
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*/
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ol.style.IconImage_.prototype.handleImageError_ = function() {
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this.imageState_ = ol.style.ImageState.ERROR;
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this.unlistenImage_();
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this.dispatchChangeEvent_();
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};
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/**
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* @private
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*/
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ol.style.IconImage_.prototype.handleImageLoad_ = function() {
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this.imageState_ = ol.style.ImageState.LOADED;
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this.size_ = [this.image_.width, this.image_.height];
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this.unlistenImage_();
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this.determineTainting_();
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this.dispatchChangeEvent_();
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};
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/**
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* @param {number} pixelRatio Pixel ratio.
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* @return {Image} Image element.
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*/
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ol.style.IconImage_.prototype.getImage = function(pixelRatio) {
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return this.image_;
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};
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/**
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* @return {ol.style.ImageState} Image state.
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*/
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ol.style.IconImage_.prototype.getImageState = function() {
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return this.imageState_;
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};
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/**
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* @param {number} pixelRatio Pixel ratio.
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* @return {Image|HTMLCanvasElement} Image element.
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*/
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ol.style.IconImage_.prototype.getHitDetectionImage = function(pixelRatio) {
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if (goog.isNull(this.hitDetectionImage_)) {
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if (this.tainting_) {
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var width = this.size_[0];
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var height = this.size_[1];
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var context = ol.dom.createCanvasContext2D(width, height);
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context.fillRect(0, 0, width, height);
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this.hitDetectionImage_ = context.canvas;
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} else {
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this.hitDetectionImage_ = this.image_;
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}
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}
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return this.hitDetectionImage_;
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};
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/**
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* @return {ol.Size} Image size.
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*/
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ol.style.IconImage_.prototype.getSize = function() {
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return this.size_;
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};
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/**
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* @return {string|undefined} Image src.
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*/
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ol.style.IconImage_.prototype.getSrc = function() {
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return this.src_;
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};
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/**
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* Load not yet loaded URI.
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*/
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ol.style.IconImage_.prototype.load = function() {
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if (this.imageState_ == ol.style.ImageState.IDLE) {
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goog.asserts.assert(goog.isDef(this.src_));
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goog.asserts.assert(goog.isNull(this.imageListenerKeys_));
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this.imageState_ = ol.style.ImageState.LOADING;
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this.imageListenerKeys_ = [
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goog.events.listenOnce(this.image_, goog.events.EventType.ERROR,
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this.handleImageError_, false, this),
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goog.events.listenOnce(this.image_, goog.events.EventType.LOAD,
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this.handleImageLoad_, false, this)
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];
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try {
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this.image_.src = this.src_;
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} catch (e) {
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this.handleImageError_();
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}
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}
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};
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/**
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* Discards event handlers which listen for load completion or errors.
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*
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* @private
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*/
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ol.style.IconImage_.prototype.unlistenImage_ = function() {
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goog.asserts.assert(!goog.isNull(this.imageListenerKeys_));
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goog.array.forEach(this.imageListenerKeys_, goog.events.unlistenByKey);
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this.imageListenerKeys_ = null;
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};
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/**
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* @constructor
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*/
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ol.style.IconImageCache = function() {
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/**
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* @type {Object.<string, ol.style.IconImage_>}
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* @private
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*/
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this.cache_ = {};
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/**
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* @type {number}
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* @private
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*/
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this.cacheSize_ = 0;
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/**
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* @const
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* @type {number}
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* @private
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*/
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this.maxCacheSize_ = 32;
|
|
};
|
|
goog.addSingletonGetter(ol.style.IconImageCache);
|
|
|
|
|
|
/**
|
|
* @param {string} src Src.
|
|
* @param {?string} crossOrigin Cross origin.
|
|
* @return {string} Cache key.
|
|
*/
|
|
ol.style.IconImageCache.getKey = function(src, crossOrigin) {
|
|
goog.asserts.assert(goog.isDef(crossOrigin));
|
|
return crossOrigin + ':' + src;
|
|
};
|
|
|
|
|
|
/**
|
|
* FIXME empty description for jsdoc
|
|
*/
|
|
ol.style.IconImageCache.prototype.clear = function() {
|
|
this.cache_ = {};
|
|
this.cacheSize_ = 0;
|
|
};
|
|
|
|
|
|
/**
|
|
* FIXME empty description for jsdoc
|
|
*/
|
|
ol.style.IconImageCache.prototype.expire = function() {
|
|
if (this.cacheSize_ > this.maxCacheSize_) {
|
|
var i = 0;
|
|
var key, iconImage;
|
|
for (key in this.cache_) {
|
|
iconImage = this.cache_[key];
|
|
if ((i++ & 3) === 0 && !goog.events.hasListener(iconImage)) {
|
|
delete this.cache_[key];
|
|
--this.cacheSize_;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {string} src Src.
|
|
* @param {?string} crossOrigin Cross origin.
|
|
* @return {ol.style.IconImage_} Icon image.
|
|
*/
|
|
ol.style.IconImageCache.prototype.get = function(src, crossOrigin) {
|
|
var key = ol.style.IconImageCache.getKey(src, crossOrigin);
|
|
return key in this.cache_ ? this.cache_[key] : null;
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {string} src Src.
|
|
* @param {?string} crossOrigin Cross origin.
|
|
* @param {ol.style.IconImage_} iconImage Icon image.
|
|
*/
|
|
ol.style.IconImageCache.prototype.set = function(src, crossOrigin, iconImage) {
|
|
var key = ol.style.IconImageCache.getKey(src, crossOrigin);
|
|
this.cache_[key] = iconImage;
|
|
++this.cacheSize_;
|
|
};
|