3e1f2e4305
enabling mixing non-opaque vector geometries with opaque external graphics on the same vector layer (closes #873) git-svn-id: http://svn.openlayers.org/trunk/openlayers@4114 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
561 lines
16 KiB
JavaScript
561 lines
16 KiB
JavaScript
/* Copyright (c) 2006-2007 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* @requires OpenLayers/Renderer/Elements.js
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*
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* Class: OpenLayers.Renderer.VML
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* Render vector features in browsers with VML capability. Construct a new
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* VML renderer with the <OpenLayers.Renderer.VML> constructor.
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*
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* Note that for all calculations in this class, we use toFixed() to round a
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* float value to an integer. This is done because it seems that VML doesn't
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* support float values.
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*
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* Inherits from:
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* - <OpenLayers.Renderer.Elements>
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*/
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OpenLayers.Renderer.VML = OpenLayers.Class(OpenLayers.Renderer.Elements, {
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/**
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* Property: xmlns
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* {String} XML Namespace URN
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*/
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xmlns: "urn:schemas-microsoft-com:vml",
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/**
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* Constructor: OpenLayers.Renderer.VML
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* Create a new VML renderer.
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*
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* Parameters:
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* containerID - {String} The id for the element that contains the renderer
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*/
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initialize: function(containerID) {
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if (!this.supported()) {
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return;
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}
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document.namespaces.add("v", "urn:schemas-microsoft-com:vml");
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var style = document.createStyleSheet();
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style.addRule('v\\:*', "behavior: url(#default#VML); " +
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"position: relative; display: inline-block;");
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OpenLayers.Renderer.Elements.prototype.initialize.apply(this,
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arguments);
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},
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/**
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* APIMethod: destroy
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* Deconstruct the renderer.
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*/
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destroy: function() {
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OpenLayers.Renderer.Elements.prototype.destroy.apply(this, arguments);
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},
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/**
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* APIMethod: supported
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* Determine whether a browser supports this renderer.
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*
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* Returns:
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* {Boolean} The browser supports the VML renderer
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*/
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supported: function() {
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var supported = document.namespaces;
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return supported;
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},
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/**
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* Method: setExtent
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* Set the renderer's extent
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*
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* Parameters:
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* extent - {<OpenLayers.Bounds>}
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*/
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setExtent: function(extent) {
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OpenLayers.Renderer.Elements.prototype.setExtent.apply(this,
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arguments);
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var resolution = this.getResolution();
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var org = extent.left/resolution + " " +
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extent.top/resolution;
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this.root.setAttribute("coordorigin", org);
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var size = extent.getWidth()/resolution + " " +
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-extent.getHeight()/resolution;
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this.root.setAttribute("coordsize", size);
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},
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/**
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* Method: setSize
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* Set the size of the drawing surface
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*
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* Parameters:
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* size - {<OpenLayers.Size>} the size of the drawing surface
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*/
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setSize: function(size) {
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OpenLayers.Renderer.prototype.setSize.apply(this, arguments);
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this.rendererRoot.style.width = this.size.w;
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this.rendererRoot.style.height = this.size.h;
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this.root.style.width = "100%";
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this.root.style.height = "100%";
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},
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/**
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* Method: getNodeType
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* Get the noode type for a geometry
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*
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* Parameters:
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* geometry - {<OpenLayers.Geometry>}
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*
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* Returns:
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* {String} The corresponding node type for the specified geometry
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*/
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getNodeType: function(geometry) {
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var nodeType = null;
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switch (geometry.CLASS_NAME) {
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case "OpenLayers.Geometry.Point":
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nodeType = "v:oval";
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break;
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case "OpenLayers.Geometry.Rectangle":
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nodeType = "v:rect";
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break;
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case "OpenLayers.Geometry.LineString":
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case "OpenLayers.Geometry.LinearRing":
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case "OpenLayers.Geometry.Polygon":
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case "OpenLayers.Geometry.Curve":
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case "OpenLayers.Geometry.Surface":
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nodeType = "v:shape";
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break;
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default:
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break;
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}
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return nodeType;
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},
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/**
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* Method: setStyle
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* Use to set all the style attributes to a VML node.
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*
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* Parameters:
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* node - {DOMElement}
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* style - {Object}
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* options - {Object}
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* isFilled - {Boolean}
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* isStroked - {Boolean}
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* geometry - {<OpenLayers.Geometry>}
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*/
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setStyle: function(node, style, options, geometry) {
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style = style || node._style;
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options = options || node._options;
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if (node._geometryClass == "OpenLayers.Geometry.Point") {
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if (style.externalGraphic) {
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// remove old node
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var id = node.id;
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var _featureId = node._featureId;
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var _geometryClass = node._geometryClass;
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var _style = node._style;
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this.root.removeChild(node);
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// create new image node
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var node = this.createNode("v:rect", id);
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var fill = this.createNode("v:fill", id+"_image");
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node.appendChild(fill);
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node._featureId = _featureId;
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node._geometryClass = _geometryClass;
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node._style = _style;
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this.root.appendChild(node);
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fill.src = style.externalGraphic;
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fill.type = "frame";
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node.style.flip = "y";
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if (!(style.graphicWidth && style.graphicHeight)) {
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fill.aspect = "atmost";
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}
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// now style the new node
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var width = style.graphicWidth || style.graphicHeight;
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var height = style.graphicHeight || style.graphicWidth;
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width = width ? width : style.pointRadius*2;
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height = height ? height : style.pointRadius*2;
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var resolution = this.getResolution();
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node.style.left = (geometry.x/resolution-.5*width).toFixed();
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node.style.top = (geometry.y/resolution-.5*height).toFixed();
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node.style.width = width;
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node.style.height = height;
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// modify fill style for rect styling below
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style.fillColor = "none";
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style.strokeColor = "none";
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} else {
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this.drawCircle(node, geometry, style.pointRadius);
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}
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}
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//fill
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var fillColor = (options.isFilled) ? style.fillColor : "none";
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node.setAttribute("fillcolor", fillColor);
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var fills = node.getElementsByTagName("fill");
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var fill = (fills.length == 0) ? null : fills[0];
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if (!options.isFilled) {
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if (fill) {
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node.removeChild(fill);
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}
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} else {
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if (!fill) {
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fill = this.createNode('v:fill', node.id + "_fill");
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node.appendChild(fill);
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}
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// if graphicOpacity is set use it in priority for external graphic
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if (node._geometryClass == "OpenLayers.Geometry.Point" &&
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style.externalGraphic &&
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style.graphicOpacity) {
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fill.setAttribute("opacity", style.graphicOpacity);
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} else if (style.fillOpacity) {
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fill.setAttribute("opacity", style.fillOpacity);
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}
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}
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//stroke
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var strokeColor = (options.isStroked) ? style.strokeColor : "none";
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node.setAttribute("strokecolor", strokeColor);
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node.setAttribute("strokeweight", style.strokeWidth);
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var strokes = node.getElementsByTagName("stroke");
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var stroke = (strokes.length == 0) ? null : strokes[0];
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if (!options.isStroked) {
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if (stroke) {
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node.removeChild(stroke);
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}
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} else {
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if (!stroke) {
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stroke = this.createNode('v:stroke', node.id + "_stroke");
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node.appendChild(stroke);
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}
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stroke.setAttribute("opacity", style.strokeOpacity);
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stroke.setAttribute("endcap", !style.strokeLinecap || style.strokeLinecap == 'butt' ? 'flat' : style.strokeLinecap);
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}
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if (style.cursor) {
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node.style.cursor = style.cursor;
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}
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},
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/**
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* Method: setNodeDimension
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* Get the geometry's bounds, convert it to our vml coordinate system,
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* then set the node's position, size, and local coordinate system.
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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setNodeDimension: function(node, geometry) {
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var bbox = geometry.getBounds();
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var resolution = this.getResolution();
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var scaledBox =
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new OpenLayers.Bounds((bbox.left/resolution).toFixed(),
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(bbox.bottom/resolution).toFixed(),
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(bbox.right/resolution).toFixed(),
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(bbox.top/resolution).toFixed());
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// Set the internal coordinate system to draw the path
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node.style.left = scaledBox.left;
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node.style.top = scaledBox.top;
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node.style.width = scaledBox.getWidth();
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node.style.height = scaledBox.getHeight();
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node.coordorigin = scaledBox.left + " " + scaledBox.top;
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node.coordsize = scaledBox.getWidth()+ " " + scaledBox.getHeight();
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},
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/**
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* Method: createNode
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* Create a new node
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*
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* Parameters:
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* type - {String} Kind of node to draw
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* id - {String} Id for node
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*
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* Returns:
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* {DOMElement} A new node of the given type and id
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*/
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createNode: function(type, id) {
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var node = document.createElement(type);
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if (id) {
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node.setAttribute('id', id);
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}
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return node;
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},
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/**
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* Method: nodeTypeCompare
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* Determine whether a node is of a given type
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*
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* Parameters:
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* type - {String} Kind of node to draw
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* id - {String} Id for node
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*
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* Returns:
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* {Boolean} Whether or not the specified node is of the specified type
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*/
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nodeTypeCompare: function(node, type) {
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//split type
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var subType = type;
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var splitIndex = subType.indexOf(":");
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if (splitIndex != -1) {
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subType = subType.substr(splitIndex+1);
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}
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//split nodeName
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var nodeName = node.nodeName;
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splitIndex = nodeName.indexOf(":");
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if (splitIndex != -1) {
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nodeName = nodeName.substr(splitIndex+1);
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}
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return (subType == nodeName);
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},
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/**
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* Method: createRenderRoot
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* Create the renderer root
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*
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* Returns:
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* {DOMElement} The specific render engine's root element
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*/
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createRenderRoot: function() {
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var id = this.container.id + "_vmlRoot";
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var rendererRoot = this.nodeFactory(id, "div");
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return rendererRoot;
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},
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/**
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* Method: createRoot
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* Create the main root element
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*
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* Returns:
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* {DOMElement} The main root element to which we'll add vectors
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*/
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createRoot: function() {
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var id = this.container.id + "_root";
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var root = this.nodeFactory(id, "v:group");
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return root;
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},
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/**************************************
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* *
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* GEOMETRY DRAWING FUNCTIONS *
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* *
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**************************************/
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/**
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* Method: drawPoint
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* Render a point
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawPoint: function(node, geometry) {
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this.drawCircle(node, geometry, 1);
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},
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/**
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* Method: drawCircle
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* Render a circle.
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* Size and Center a circle given geometry (x,y center) and radius
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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* radius - {float}
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*/
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drawCircle: function(node, geometry, radius) {
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var resolution = this.getResolution();
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node.style.left = (geometry.x /resolution).toFixed() - radius;
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node.style.top = (geometry.y /resolution).toFixed() - radius;
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var diameter = radius * 2;
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node.style.width = diameter;
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node.style.height = diameter;
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},
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/**
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* Method: drawLineString
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* Render a linestring.
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawLineString: function(node, geometry) {
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this.drawLine(node, geometry, false);
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},
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/**
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* Method: drawLinearRing
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* Render a linearring
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawLinearRing: function(node, geometry) {
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this.drawLine(node, geometry, true);
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},
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/**
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* Method: DrawLine
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* Render a line.
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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* closeLine - {Boolean} Close the line? (make it a ring?)
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*/
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drawLine: function(node, geometry, closeLine) {
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this.setNodeDimension(node, geometry);
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var resolution = this.getResolution();
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var path = "m";
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for (var i = 0; i < geometry.components.length; i++) {
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var x = (geometry.components[i].x/resolution);
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var y = (geometry.components[i].y/resolution);
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path += " " + x.toFixed() + "," + y.toFixed() + " l ";
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}
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if (closeLine) {
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path += " x";
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}
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path += " e";
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node.path = path;
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},
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/**
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* Method: drawPolygon
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* Render a polygon
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawPolygon: function(node, geometry) {
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this.setNodeDimension(node, geometry);
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var resolution = this.getResolution();
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var path = "";
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for (var j = 0; j < geometry.components.length; j++) {
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var linearRing = geometry.components[j];
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path += "m";
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for (var i = 0; i < linearRing.components.length; i++) {
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var x = linearRing.components[i].x / resolution;
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var y = linearRing.components[i].y / resolution;
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path += " " + x.toFixed() + "," + y.toFixed();
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if (i==0) {
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path += " l";
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}
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}
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path += " x ";
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}
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path += "e";
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node.path = path;
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},
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/**
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* Method: drawRectangle
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* Render a rectangle
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawRectangle: function(node, geometry) {
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var resolution = this.getResolution();
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node.style.left = geometry.x/resolution;
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node.style.top = geometry.y/resolution;
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node.style.width = geometry.width/resolution;
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node.style.height = geometry.height/resolution;
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},
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/**
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* Method: drawCurve
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawCurve: function(node, geometry) {
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this.setNodeDimension(node, geometry);
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var resolution = this.getResolution();
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var path = "";
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for (var i = 0; i < geometry.components.length; i++) {
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var x = geometry.components[i].x / resolution;
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var y = geometry.components[i].y / resolution;
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if ((i%3)==0 && (i/3)==0) {
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path += "m"
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} else if ((i%3)==1) {
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path += " c"
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}
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path += " " + x + "," + y;
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}
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path += " x e";
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node.path = path;
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},
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/**
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* Method: drawSurface
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*
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* Parameters:
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* node - {DOMElement}
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* geometry - {<OpenLayers.Geometry>}
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*/
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drawSurface: function(node, geometry) {
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this.setNodeDimension(node, geometry);
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var resolution = this.getResolution();
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var path = "";
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for (var i = 0; i < geometry.components.length; i++) {
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var x = geometry.components[i].x / resolution;
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var y = geometry.components[i].y / resolution;
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if ((i%3)==0 && (i/3)==0) {
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path += "m";
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} else if ((i%3)==1) {
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path += " c";
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}
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path += " " + x + "," + y;
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}
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path += " x e";
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node.path = path;
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},
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CLASS_NAME: "OpenLayers.Renderer.VML"
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});
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