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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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/**
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* @class
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*/
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OpenLayers.Icon = Class.create();
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OpenLayers.Icon.prototype = {
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/** image url
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* @type String */
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url: null,
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/** @type OpenLayers.Size */
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size:null,
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/** distance in pixels to offset the image when being rendered
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* @type OpenLayers.Pixel */
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offset: null,
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/** Function to calculate the offset (based on the size)
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* @type OpenLayers.Pixel */
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calculateOffset: null,
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/** @type DOMElement */
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imageDiv: null,
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/** @type OpenLayers.Pixel */
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px: null,
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/**
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* @constructor
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*
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* @param {String} url
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* @param {OpenLayers.Size} size
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* @param {Function} calculateOffset
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*/
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initialize: function(url, size, offset, calculateOffset) {
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this.url = url;
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this.size = (size) ? size : new OpenLayers.Size(20,20);
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this.offset = (offset) ? offset : new OpenLayers.Pixel(0,0);
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this.calculateOffset = calculateOffset;
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this.imageDiv = OpenLayers.Util.createAlphaImageDiv();
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},
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destroy: function() {
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this.imageDiv = null;
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},
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/**
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* @returns A fresh copy of the icon.
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* @type OpenLayers.Icon
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*/
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clone: function() {
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return new OpenLayers.Icon(this.url,
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this.size,
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this.offset,
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this.calculateOffset);
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},
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/**
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* @param {OpenLayers.Size} size
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*/
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setSize: function(size) {
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if (size != null) {
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this.size = size;
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}
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this.draw();
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},
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/**
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* @param {OpenLayers.Pixel} px
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*
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* @return A new DOM Image of this icon set at the location passed-in
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* @type DOMElement
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*/
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draw: function(px) {
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OpenLayers.Util.modifyAlphaImageDiv(this.imageDiv,
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null,
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null,
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this.size,
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this.url,
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"absolute");
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this.moveTo(px);
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return this.imageDiv;
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},
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/**
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* @param {OpenLayers.Pixel} px
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*/
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moveTo: function (px) {
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//if no px passed in, use stored location
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if (px != null) {
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this.px = px;
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}
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if (this.imageDiv != null) {
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if (this.px == null) {
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this.display(false);
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} else {
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if (this.calculateOffset) {
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this.offset = this.calculateOffset(this.size);
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}
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var offsetPx = this.px.offset(this.offset);
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OpenLayers.Util.modifyAlphaImageDiv(this.imageDiv, null, offsetPx);
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this.display(true);
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}
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}
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},
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/** Hide or show the icon
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*
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* @param {Boolean} display
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*/
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display: function(display) {
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this.imageDiv.style.display = (display) ? "" : "none";
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Icon"
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};
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