09e0d3ec81
git-svn-id: http://svn.openlayers.org/trunk/openlayers@5614 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
505 lines
16 KiB
JavaScript
505 lines
16 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.SVG
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*
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* Inherits:
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* - <OpenLayers.Renderer.Elements>
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*/
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OpenLayers.Renderer.SVG = OpenLayers.Class(OpenLayers.Renderer.Elements, {
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/**
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* Property: xmlns
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* {String}
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*/
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xmlns: "http://www.w3.org/2000/svg",
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/**
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* Constant: MAX_PIXEL
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* {Integer} Firefox has a limitation where values larger or smaller than
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* about 15000 in an SVG document lock the browser up. This
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* works around it.
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*/
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MAX_PIXEL: 15000,
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/**
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* Property: localResolution
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* {Float}
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*/
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localResolution: null,
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/**
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* Constructor: OpenLayers.Renderer.SVG
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*
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* Parameters:
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* containerID - {String}
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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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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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*/
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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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*
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* Returns:
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* {Boolean} Whether or not the browser supports the SVG renderer
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*/
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supported: function() {
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var svgFeature = "http://www.w3.org/TR/SVG11/feature#SVG";
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return (document.implementation &&
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(document.implementation.hasFeature("org.w3c.svg", "1.0") ||
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document.implementation.hasFeature(svgFeature, "1.1")));
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},
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/**
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* Method: inValidRange
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* See #669 for more information
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* Parameters:
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* x - {Integer}
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* y - {Integer}
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*
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* Returns:
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* {Boolean} Whether or not the 'x' and 'y' coordinates are in the
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* valid range.
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*/
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inValidRange: function(x, y) {
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return (x >= -this.MAX_PIXEL && x <= this.MAX_PIXEL &&
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y >= -this.MAX_PIXEL && y <= this.MAX_PIXEL);
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},
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/**
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* Method: setExtent
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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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// If the resolution has changed, start over changing the corner, because
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// the features will redraw.
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if (!this.localResolution || resolution != this.localResolution) {
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this.left = -extent.left / resolution;
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this.top = extent.top / resolution;
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}
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var left = 0;
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var top = 0;
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// If the resolution has not changed, we already have features, and we need
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// to adjust the viewbox to fit them.
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if (this.localResolution && resolution == this.localResolution) {
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left = (this.left) - (-extent.left / resolution);
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top = (this.top) - (extent.top / resolution);
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}
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// Store resolution for use later.
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this.localResolution = resolution;
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// Set the viewbox -- the left/top will be pixels-dragged-since-res change,
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// the width/height will be pixels.
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var extentString = left + " " + top + " " +
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extent.getWidth() / resolution + " " + extent.getHeight() / resolution;
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//var extentString = extent.left / resolution + " " + -extent.top / resolution + " " +
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this.rendererRoot.setAttributeNS(null, "viewBox", extentString);
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},
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/**
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* Method: setSize
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* Sets 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.setAttributeNS(null, "width", this.size.w);
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this.rendererRoot.setAttributeNS(null, "height", this.size.h);
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},
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/**
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* Method: getNodeType
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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 ? "image" : "circle";
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break;
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case "OpenLayers.Geometry.Rectangle":
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nodeType = "rect";
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break;
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case "OpenLayers.Geometry.LineString":
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nodeType = "polyline";
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break;
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case "OpenLayers.Geometry.LinearRing":
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nodeType = "polygon";
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break;
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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 = "path";
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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 SVG node.
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*
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* Takes care to adjust stroke width and point radius to be
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* resolution-relative
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*
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* Parameters:
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* node - {SVGDomElement} An SVG 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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*/
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setStyle: function(node, style, options) {
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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 x = parseFloat(node.getAttributeNS(null, "cx"));
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var y = parseFloat(node.getAttributeNS(null, "cy"));
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if (style.graphicWidth && style.graphicHeight) {
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node.setAttributeNS(null, "preserveAspectRatio", "none");
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}
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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 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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var opacity = style.graphicOpacity || style.fillOpacity;
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node.setAttributeNS(null, "x", (x + xOffset).toFixed());
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node.setAttributeNS(null, "y", (y + yOffset).toFixed());
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node.setAttributeNS(null, "width", width);
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node.setAttributeNS(null, "height", height);
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node.setAttributeNS("http://www.w3.org/1999/xlink", "href", style.externalGraphic);
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node.setAttributeNS(null, "style", "opacity: "+opacity);
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} else {
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node.setAttributeNS(null, "r", style.pointRadius);
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}
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}
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if (options.isFilled) {
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node.setAttributeNS(null, "fill", style.fillColor);
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node.setAttributeNS(null, "fill-opacity", style.fillOpacity);
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} else {
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node.setAttributeNS(null, "fill", "none");
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}
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if (options.isStroked) {
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node.setAttributeNS(null, "stroke", style.strokeColor);
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node.setAttributeNS(null, "stroke-opacity", style.strokeOpacity);
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node.setAttributeNS(null, "stroke-width", style.strokeWidth);
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node.setAttributeNS(null, "stroke-linecap", style.strokeLinecap);
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} else {
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node.setAttributeNS(null, "stroke", "none");
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}
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if (style.pointerEvents) {
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node.setAttributeNS(null, "pointer-events", style.pointerEvents);
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}
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if (style.cursor) {
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node.setAttributeNS(null, "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: createNode
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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.createElementNS(this.xmlns, type);
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if (id) {
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node.setAttributeNS(null, "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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*
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* Parameters:
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* node - {SVGDomElement} An SVG 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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return (type == node.nodeName);
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},
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/**
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* Method: createRenderRoot
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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 + "_svgRoot", "svg");
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},
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/**
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* Method: createRoot
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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", "g");
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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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* This method is only called by the renderer itself.
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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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* This method is only called by the renderer itself.
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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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var x = (geometry.x / resolution + this.left);
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var y = (this.top - geometry.y / resolution);
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if (this.inValidRange(x, y)) {
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node.setAttributeNS(null, "cx", x);
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node.setAttributeNS(null, "cy", y);
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node.setAttributeNS(null, "r", radius);
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} else {
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this.root.removeChild(node);
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}
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},
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/**
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* Method: drawLineString
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* This method is only called by the renderer itself.
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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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node.setAttributeNS(null, "points",
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this.getComponentsString(geometry.components));
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},
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/**v
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* Method: drawLinearRing
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* This method is only called by the renderer itself.
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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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node.setAttributeNS(null, "points",
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this.getComponentsString(geometry.components));
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},
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/**
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* Method: drawPolygon
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* This method is only called by the renderer itself.
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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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var d = "";
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var draw = true;
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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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d += " M";
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for (var i = 0; i < linearRing.components.length; i++) {
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var component = this.getShortString(linearRing.components[i]);
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if (component) {
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d += " " + component;
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} else {
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draw = false;
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}
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}
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}
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d += " z";
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if (draw) {
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node.setAttributeNS(null, "d", d);
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node.setAttributeNS(null, "fill-rule", "evenodd");
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} else {
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node.setAttributeNS(null, "d", "");
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}
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},
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/**
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* Method: drawRectangle
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* This method is only called by the renderer itself.
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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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var x = (geometry.x / resolution + this.left);
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var y = (this.top - geometry.y / resolution);
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if (this.inValidRange(x, y)) {
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node.setAttributeNS(null, "x", x);
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node.setAttributeNS(null, "y", y);
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node.setAttributeNS(null, "width", geometry.width / resolution);
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node.setAttributeNS(null, "height", geometry.height / resolution);
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} else {
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node.setAttributeNS(null, "x", "");
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node.setAttributeNS(null, "y", "");
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node.setAttributeNS(null, "width", 0);
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node.setAttributeNS(null, "height", 0);
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}
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},
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/**
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* Method: drawSurface
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* This method is only called by the renderer itself.
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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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// create the svg path string representation
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var d = null;
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var draw = true;
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for (var i = 0; i < geometry.components.length; i++) {
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if ((i%3) == 0 && (i/3) == 0) {
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var component = this.getShortString(geometry.components[i]);
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if (!component) { draw = false; }
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d = "M " + component;
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} else if ((i%3) == 1) {
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var component = this.getShortString(geometry.components[i]);
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if (!component) { draw = false; }
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d += " C " + component;
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} else {
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var component = this.getShortString(geometry.components[i]);
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if (!component) { draw = false; }
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d += " " + component;
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}
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}
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d += " Z";
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if (draw) {
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node.setAttributeNS(null, "d", d);
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} else {
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node.setAttributeNS(null, "d", "");
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}
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},
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/**
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* Method: getComponentString
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*
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* Parameters:
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* components - {Array(<OpenLayers.Geometry.Point>)} Array of points
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*/
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getComponentsString: function(components) {
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var strings = [];
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for(var i = 0; i < components.length; i++) {
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var component = this.getShortString(components[i]);
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if (component) {
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strings.push(component);
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}
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}
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return strings.join(",");
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},
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/**
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* Method: getShortString
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*
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* Parameters:
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* point - {<OpenLayers.Geometry.Point>}
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*
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* Returns:
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* {String}
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*/
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getShortString: function(point) {
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var resolution = this.getResolution();
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var x = (point.x / resolution + this.left);
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var y = (this.top - point.y / resolution);
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if (this.inValidRange(x, y)) {
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return x + "," + y;
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} else {
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return false;
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}
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},
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CLASS_NAME: "OpenLayers.Renderer.SVG"
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});
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