044368664f
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4-rc3@3113 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
260 lines
8.3 KiB
JavaScript
260 lines
8.3 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/**
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* @class
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*
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* This is another virtual class in that it should never be instantiated by
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* itself as a Renderer. It exists because there is *tons* of shared
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* functionality between different vector libraries which use nodes/elements
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* as a base for rendering vectors.
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*
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* The highlevel bits of code that are implemented here are the adding and
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* removing of geometries, which is essentially the same for any
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* element-based renderer. The details of creating each node and drawing the
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* paths are of course different, but the machinery is the same.
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*
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* @requires OpenLayers/Renderer.js
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*/
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OpenLayers.Renderer.Elements = OpenLayers.Class.create();
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OpenLayers.Renderer.Elements.prototype =
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OpenLayers.Class.inherit(OpenLayers.Renderer, {
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/** @type DOMElement */
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rendererRoot: null,
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/** @type DOMElement */
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root: null,
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/** @type String */
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xmlns: null,
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/**
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* @constructor
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*
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* @param {String} containerID
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*/
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initialize: function(containerID) {
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OpenLayers.Renderer.prototype.initialize.apply(this, arguments);
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this.rendererRoot = this.createRenderRoot();
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this.root = this.createRoot();
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this.rendererRoot.appendChild(this.root);
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this.container.appendChild(this.rendererRoot);
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},
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/**
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*
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*/
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destroy: function() {
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this.clear();
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this.rendererRoot = null;
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this.root = null;
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this.xmlns = null;
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OpenLayers.Renderer.prototype.destroy.apply(this, arguments);
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},
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/**
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* Remove all the elements from the root
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* @private
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*/
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clear: function() {
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if (this.root) {
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while (this.root.childNodes.length > 0) {
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this.root.removeChild(this.root.firstChild);
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}
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}
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},
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/** This function is in charge of asking the specific renderer which type
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* of node to create for the given geometry. All geometries in an
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* Elements-based renderer consist of one node and some attributes. We
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* have the nodeFactory() function which creates a node for us, but it
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* takes a 'type' as input, and that is precisely what this function
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* tells us.
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*
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* @param geometry {OpenLayers.Geometry}
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*
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* @returns The corresponding node type for the specified geometry
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* @type String
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* @private
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*/
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getNodeType: function(geometry) { },
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/**
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* Draw the geometry, creating new nodes, setting paths, setting style,
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* setting featureId on the node. This method should only be called
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* by the renderer itself.
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*
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* @param {OpenLayers.Geometry} geometry
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* @param {Object} style
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* @param {String} featureId
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* @private
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*/
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drawGeometry: function(geometry, style, featureId) {
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if ((geometry.CLASS_NAME == "OpenLayers.Geometry.MultiPoint") ||
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(geometry.CLASS_NAME == "OpenLayers.Geometry.MultiLineString") ||
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(geometry.CLASS_NAME == "OpenLayers.Geometry.MultiPolygon")) {
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for (var i = 0; i < geometry.components.length; i++) {
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this.drawGeometry(geometry.components[i], style, featureId);
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}
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return;
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};
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//first we create the basic node and add it to the root
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var nodeType = this.getNodeType(geometry);
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var node = this.nodeFactory(geometry.id, nodeType, geometry);
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node._featureId = featureId;
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node._geometryClass = geometry.CLASS_NAME;
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node._style = style;
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this.root.appendChild(node);
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//now actually draw the node, and style it
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this.drawGeometryNode(node, geometry);
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},
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/**
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* Given a node, draw a geometry on the specified layer.
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* node and geometry are required arguments, style is optional.
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* This method is only called by the render itself.
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*
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* @param {DOMElement} node
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* @param {OpenLayers.Geometry} geometry
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* @param {Object} style
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* @private
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*/
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drawGeometryNode: function(node, geometry, style) {
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style = style || node._style;
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var options = {
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'isFilled': true,
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'isStroked': true
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};
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switch (geometry.CLASS_NAME) {
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case "OpenLayers.Geometry.Point":
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this.drawPoint(node, geometry);
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break;
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case "OpenLayers.Geometry.LineString":
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options.isFilled = false;
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this.drawLineString(node, geometry);
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break;
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case "OpenLayers.Geometry.LinearRing":
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this.drawLinearRing(node, geometry);
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break;
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case "OpenLayers.Geometry.Polygon":
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this.drawPolygon(node, geometry);
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break;
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case "OpenLayers.Geometry.Surface":
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this.drawSurface(node, geometry);
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break;
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case "OpenLayers.Geometry.Rectangle":
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this.drawRectangle(node, geometry);
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break;
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default:
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break;
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}
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node._style = style;
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node._options = options;
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//set style
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//TBD simplify this
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this.setStyle(node, style, options, geometry);
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},
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/**
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* virtual functions for drawing different Geometries.
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* These should all be implemented by subclasses.
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* These methods are only called by the render itself.
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*
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* @param {DOMElement} node
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* @param {OpenLayers.Geometry} geometry
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* @private
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*/
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drawPoint: function(node, geometry) {},
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drawLineString: function(node, geometry) {},
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drawLinearRing: function(node, geometry) {},
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drawPolygon: function(node, geometry) {},
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drawRectangle: function(node, geometry) {},
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drawCircle: function(node, geometry) {},
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drawCurve: function(node, geometry) {},
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drawSurface: function(node, geometry) {},
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/**
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* @param evt {Object} an OpenLayers.Event object
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*
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* @returns A geometry from an event that happened on a layer
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* @type OpenLayers.Geometry
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* @private
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*/
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getFeatureIdFromEvent: function(evt) {
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var node = evt.target || evt.srcElement;
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return node._featureId;
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},
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/** Erase a geometry from the renderer. In the case of a multi-geometry,
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* we cycle through and recurse on ourselves. Otherwise, we look for a
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* node with the geometry.id, destroy its geometry, and remove it from
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* the DOM.
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*
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* @param {OpenLayers.Geometry} geometry
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* @private
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*/
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eraseGeometry: function(geometry) {
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if ((geometry.CLASS_NAME == "OpenLayers.Geometry.MultiPoint") ||
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(geometry.CLASS_NAME == "OpenLayers.Geometry.MultiLineString") ||
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(geometry.CLASS_NAME == "OpenLayers.Geometry.MultiPolygon")) {
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for (var i = 0; i < geometry.components.length; i++) {
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this.eraseGeometry(geometry.components[i]);
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}
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} else {
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var element = $(geometry.id);
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if (element && element.parentNode) {
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if (element.geometry) {
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element.geometry.destroy();
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element.geometry = null;
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}
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element.parentNode.removeChild(element);
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}
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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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* Create new node of the specified type, with the (optional) specified id.
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*
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* If node already exists with same ID and type, we remove it and then
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* call ourselves again to recreate it.
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*
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* @param {String} id
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* @param {String} type Kind of node to draw
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* @param {OpenLayers.Geometry} geometry
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*
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* @returns A new node of the given type and id
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* @type DOMElement
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* @private
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*/
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nodeFactory: function(id, type, geometry) {
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var node = $(id);
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if (node) {
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if (!this.nodeTypeCompare(node, type)) {
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node.parentNode.removeChild(node);
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node = this.nodeFactory(id, type, geometry);
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}
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} else {
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node = this.createNode(type, id);
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}
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return node;
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Renderer.Elements"
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});
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