cab3f90411
git-svn-id: http://svn.openlayers.org/trunk/openlayers@7587 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
700 lines
23 KiB
JavaScript
700 lines
23 KiB
JavaScript
/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
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* license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* 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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/**
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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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if (!document.namespaces.olv) {
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document.namespaces.add("olv", this.xmlns);
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var style = document.createStyleSheet();
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style.addRule('olv\\:*', "behavior: url(#default#VML); " +
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"position: absolute; display: inline-block;");
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}
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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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return !!(document.namespaces);
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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 - this.size.h);
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this.root.setAttribute("coordorigin", org);
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var size = this.size.w + " " + this.size.h;
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this.root.setAttribute("coordsize", size);
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// flip the VML display Y axis upside down so it
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// matches the display Y axis of the map
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this.root.style.flip = "y";
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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 + "px";
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this.rendererRoot.style.height = this.size.h + "px";
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this.root.style.width = this.size.w + "px";
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this.root.style.height = this.size.h + "px";
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},
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/**
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* Method: getNodeType
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* Get the node type for a geometry and style
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*
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* Parameters:
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* geometry - {<OpenLayers.Geometry>}
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* style - {Object}
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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, style) {
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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 = style.externalGraphic ? "olv:rect" : "olv:oval";
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break;
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case "OpenLayers.Geometry.Rectangle":
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nodeType = "olv: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 = "olv: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} An VML element to decorate
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* style - {Object}
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* options - {Object} Currently supported options include
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* 'isFilled' {Boolean} and
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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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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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var xOffset = (style.graphicXOffset != undefined) ?
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style.graphicXOffset : -(0.5 * width);
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var yOffset = (style.graphicYOffset != undefined) ?
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style.graphicYOffset : -(0.5 * height);
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node.style.left = ((geometry.x/resolution)+xOffset).toFixed();
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node.style.top = ((geometry.y/resolution)-(yOffset+height)).toFixed();
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node.style.width = width + "px";
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node.style.height = height + "px";
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node.style.flip = "y";
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// modify style/options for fill and stroke styling below
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style.fillColor = "none";
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options.isStroked = false;
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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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if (options.isFilled) {
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node.setAttribute("fillcolor", style.fillColor);
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} else {
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node.setAttribute("filled", "false");
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}
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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('olv:fill', node.id + "_fill");
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}
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fill.setAttribute("opacity", style.fillOpacity);
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if (node._geometryClass == "OpenLayers.Geometry.Point" &&
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style.externalGraphic) {
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// override fillOpacity
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if (style.graphicOpacity) {
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fill.setAttribute("opacity", style.graphicOpacity);
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}
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fill.setAttribute("src", style.externalGraphic);
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fill.setAttribute("type", "frame");
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if (!(style.graphicWidth && style.graphicHeight)) {
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fill.aspect = "atmost";
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}
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// additional rendering for rotated graphics
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if (style.rotation) {
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this.graphicRotate(node, xOffset, yOffset);
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// make the fill fully transparent, because we now have
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// the graphic as imagedata element. We cannot just remove
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// the fill, because this is part of the hack described
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// in graphicRotate
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fill.setAttribute("opacity", 0);
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}
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}
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if (fill.parentNode != node) {
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node.appendChild(fill);
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}
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}
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// stroke
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if (options.isStroked) {
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node.setAttribute("strokecolor", style.strokeColor);
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node.setAttribute("strokeweight", style.strokeWidth + "px");
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} else {
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node.setAttribute("stroked", "false");
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}
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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('olv: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 != "inherit" && style.cursor != null) {
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node.style.cursor = style.cursor;
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}
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return node;
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},
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/**
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* Method: graphicRotate
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* If a point is to be styled with externalGraphic and rotation, VML fills
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* cannot be used to display the graphic, because rotation of graphic
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* fills is not supported by the VML implementation of Internet Explorer.
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* This method creates a olv:imagedata element inside the VML node,
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* DXImageTransform.Matrix and BasicImage filters for rotation and
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* opacity, and a 3-step hack to remove rendering artefacts from the
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* graphic and preserve the ability of graphics to trigger events.
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* Finally, OpenLayers methods are used to determine the correct
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* insertion point of the rotated image, because DXImageTransform.Matrix
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* does the rotation without the ability to specify a rotation center
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* point.
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*
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* Parameters:
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* node - {DOMElement}
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* xOffset - {Number} rotation center relative to image, x coordinate
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* yOffset - {Number} rotation center relative to image, y coordinate
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*/
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graphicRotate: function(node, xOffset, yOffset) {
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var style = style || node._style;
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var options = node._options;
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var aspectRatio, size;
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if (!(style.graphicWidth && style.graphicHeight)) {
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// load the image to determine its size
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var img = new Image();
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img.onreadystatechange = OpenLayers.Function.bind(function() {
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if(img.readyState == "complete" ||
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img.readyState == "interactive") {
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aspectRatio = img.width / img.height;
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size = Math.max(style.pointRadius * 2,
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style.graphicWidth || 0,
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style.graphicHeight || 0);
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xOffset = xOffset * aspectRatio;
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style.graphicWidth = size * aspectRatio;
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style.graphicHeight = size;
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this.graphicRotate(node, xOffset, yOffset)
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}
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}, this);
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img.src = style.externalGraphic;
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// will be called again by the onreadystate handler
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return;
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} else {
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size = Math.max(style.graphicWidth, style.graphicHeight);
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aspectRatio = style.graphicWidth / style.graphicHeight;
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}
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var width = Math.round(style.graphicWidth || size * aspectRatio);
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var height = Math.round(style.graphicHeight || size);
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node.style.width = width + "px";
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node.style.height = height + "px";
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// Three steps are required to remove artefacts for images with
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// transparent backgrounds (resulting from using DXImageTransform
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// filters on svg objects), while preserving awareness for browser
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// events on images:
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// - Use the fill as usual (like for unrotated images) to handle
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// events
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// - specify an imagedata element with the same src as the fill
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// - style the imagedata element with an AlphaImageLoader filter
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// with empty src
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var image = document.getElementById(node.id + "_image");
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if (!image) {
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image = this.createNode("olv:imagedata", node.id + "_image");
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node.appendChild(image);
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}
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image.style.width = width + "px";
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image.style.height = height + "px";
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image.src = style.externalGraphic;
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image.style.filter =
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"progid:DXImageTransform.Microsoft.AlphaImageLoader(" +
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"src='', sizingMethod='scale')";
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var rotation = style.rotation * Math.PI / 180;
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var sintheta = Math.sin(rotation);
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var costheta = Math.cos(rotation);
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// do the rotation on the image
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var filter =
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"progid:DXImageTransform.Microsoft.Matrix(M11=" + costheta +
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",M12=" + (-sintheta) + ",M21=" + sintheta + ",M22=" + costheta +
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",SizingMethod='auto expand')\n"
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// set the opacity (needed for the imagedata)
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var opacity = style.graphicOpacity || style.fillOpacity;
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if (opacity && opacity != 1) {
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filter +=
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"progid:DXImageTransform.Microsoft.BasicImage(opacity=" +
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opacity+")\n";
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}
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node.style.filter = filter;
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// do the rotation again on a box, so we know the insertion point
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var centerPoint = new OpenLayers.Geometry.Point(-xOffset, -yOffset);
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var imgBox = new OpenLayers.Bounds(0, 0, width, height).toGeometry();
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imgBox.rotate(style.rotation, centerPoint);
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var imgBounds = imgBox.getBounds();
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node.style.left = Math.round(
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parseInt(node.style.left) + imgBounds.left) + "px";
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node.style.top = Math.round(
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parseInt(node.style.top) - imgBounds.bottom) + "px";
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},
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/**
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* Method: postDraw
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* Some versions of Internet Explorer seem to be unable to set fillcolor
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* and strokecolor to "none" correctly before the fill node is appended to
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* a visible vml node. This method takes care of that and sets fillcolor
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* and strokecolor again if needed.
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*
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* Parameters:
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* node - {DOMElement}
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*/
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postDraw: function(node) {
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var fillColor = node._style.fillColor;
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var strokeColor = node._style.strokeColor;
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if (fillColor == "none" &&
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node.getAttribute("fillcolor") != fillColor) {
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node.setAttribute("fillcolor", fillColor);
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}
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if (strokeColor == "none" &&
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node.getAttribute("strokecolor") != strokeColor) {
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node.setAttribute("strokecolor", strokeColor);
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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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if(bbox) {
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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 + "px";
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node.style.top = scaledBox.top + "px";
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node.style.width = scaledBox.getWidth() + "px";
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node.style.height = scaledBox.getHeight() + "px";
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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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/**
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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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// IE hack to make elements unselectable, to prevent 'blue flash'
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// while dragging vectors; #1410
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node.setAttribute('unselectable', 'on', 0);
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node.onselectstart = function() { return(false); };
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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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* node - {DOMElement} An VML element
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* type - {String} Kind of 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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return this.nodeFactory(this.container.id + "_vmlRoot", "div");
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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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return this.nodeFactory(this.container.id + "_root", "olv:group");
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},
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/**
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* Method: drawFeature
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* Overrides the superclass's drawFeature method to take care of features
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* that are outside the viewport.
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*
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* Parameters:
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* feature - {<OpenLayers.Feature.Vector>}
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* style - {<Object>}
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*/
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drawFeature: function(feature, style) {
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if (!feature.geometry.getBounds().intersectsBounds(this.extent)) {
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style = {display: "none"};
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}
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OpenLayers.Renderer.Elements.prototype.drawFeature.apply(this,
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[feature, style]);
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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>}
|
|
*/
|
|
drawPoint: function(node, geometry) {
|
|
this.drawCircle(node, geometry, 1);
|
|
},
|
|
|
|
/**
|
|
* Method: drawCircle
|
|
* Render a circle.
|
|
* Size and Center a circle given geometry (x,y center) and radius
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
* radius - {float}
|
|
*/
|
|
drawCircle: function(node, geometry, radius) {
|
|
if(!isNaN(geometry.x)&& !isNaN(geometry.y)) {
|
|
var resolution = this.getResolution();
|
|
|
|
node.style.left = ((geometry.x /resolution).toFixed() - radius) + "px";
|
|
node.style.top = ((geometry.y /resolution).toFixed() - radius) + "px";
|
|
|
|
var diameter = radius * 2;
|
|
|
|
node.style.width = diameter + "px";
|
|
node.style.height = diameter + "px";
|
|
}
|
|
},
|
|
|
|
|
|
/**
|
|
* Method: drawLineString
|
|
* Render a linestring.
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
*/
|
|
drawLineString: function(node, geometry) {
|
|
this.drawLine(node, geometry, false);
|
|
},
|
|
|
|
/**
|
|
* Method: drawLinearRing
|
|
* Render a linearring
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
*/
|
|
drawLinearRing: function(node, geometry) {
|
|
this.drawLine(node, geometry, true);
|
|
},
|
|
|
|
/**
|
|
* Method: DrawLine
|
|
* Render a line.
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
* closeLine - {Boolean} Close the line? (make it a ring?)
|
|
*/
|
|
drawLine: function(node, geometry, closeLine) {
|
|
|
|
this.setNodeDimension(node, geometry);
|
|
|
|
var resolution = this.getResolution();
|
|
var numComponents = geometry.components.length;
|
|
var parts = new Array(numComponents);
|
|
|
|
var comp, x, y;
|
|
for (var i = 0; i < numComponents; i++) {
|
|
comp = geometry.components[i];
|
|
x = (comp.x/resolution);
|
|
y = (comp.y/resolution);
|
|
parts[i] = " " + x.toFixed() + "," + y.toFixed() + " l ";
|
|
}
|
|
var end = (closeLine) ? " x e" : " e";
|
|
node.path = "m" + parts.join("") + end;
|
|
},
|
|
|
|
/**
|
|
* Method: drawPolygon
|
|
* Render a polygon
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
*/
|
|
drawPolygon: function(node, geometry) {
|
|
this.setNodeDimension(node, geometry);
|
|
|
|
var resolution = this.getResolution();
|
|
|
|
var path = [];
|
|
var linearRing, i, comp, x, y;
|
|
for (var j = 0; j < geometry.components.length; j++) {
|
|
linearRing = geometry.components[j];
|
|
|
|
path.push("m");
|
|
for (i = 0; i < linearRing.components.length; i++) {
|
|
comp = linearRing.components[i];
|
|
x = comp.x / resolution;
|
|
y = comp.y / resolution;
|
|
path.push(" " + x.toFixed() + "," + y.toFixed());
|
|
if (i==0) {
|
|
path.push(" l");
|
|
}
|
|
}
|
|
path.push(" x ");
|
|
}
|
|
path.push("e");
|
|
node.path = path.join("");
|
|
},
|
|
|
|
/**
|
|
* Method: drawRectangle
|
|
* Render a rectangle
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
*/
|
|
drawRectangle: function(node, geometry) {
|
|
var resolution = this.getResolution();
|
|
|
|
node.style.left = geometry.x/resolution + "px";
|
|
node.style.top = geometry.y/resolution + "px";
|
|
node.style.width = geometry.width/resolution + "px";
|
|
node.style.height = geometry.height/resolution + "px";
|
|
},
|
|
|
|
/**
|
|
* Method: drawSurface
|
|
*
|
|
* Parameters:
|
|
* node - {DOMElement}
|
|
* geometry - {<OpenLayers.Geometry>}
|
|
*/
|
|
drawSurface: function(node, geometry) {
|
|
|
|
this.setNodeDimension(node, geometry);
|
|
|
|
var resolution = this.getResolution();
|
|
|
|
var path = [];
|
|
var comp, x, y;
|
|
for (var i = 0; i < geometry.components.length; i++) {
|
|
comp = geometry.components[i];
|
|
x = comp.x / resolution;
|
|
y = comp.y / resolution;
|
|
if ((i%3)==0 && (i/3)==0) {
|
|
path.push("m");
|
|
} else if ((i%3)==1) {
|
|
path.push(" c");
|
|
}
|
|
path.push(" " + x + "," + y);
|
|
}
|
|
path.push(" x e");
|
|
|
|
node.path = path.join("");
|
|
},
|
|
|
|
CLASS_NAME: "OpenLayers.Renderer.VML"
|
|
});
|