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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 22-9 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 22-9 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>// Create a namespace for our SVG-related utilitiesvar SVG = {};// These are SVG-related namespace URLsSVG.ns = "http://www.w3.org/2000/svg";SVG.xlinkns = "http://www.w3.org/1999/xlink";// Create and return an empty <svg> element.// Note that the element is not added to the document// Note that we can specify the pixel size of the image as well as// its internal coordinate system.SVG.makeCanvas = function(id, pixelWidth, pixelHeight, userWidth, userHeight) { var svg = document.createElementNS(SVG.ns, "svg:svg"); svg.setAttribute("id", id); // How big is the canvas in pixels svg.setAttribute("width", pixelWidth); svg.setAttribute("height", pixelHeight); // Set the coordinates used by drawings in the canvas svg.setAttribute("viewBox", "0 0 " + userWidth + " " + userHeight); // Define the XLink namespace that SVG uses svg.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", SVG.xlinkns); return svg;};// Serialize the canvas element to a string and use this string// in a data: URL for display in an <object> tag. This allows SVG// to work in browsers that support the data: URL scheme and have an SVG // plugin installed.SVG.makeDataURL = function(canvas) { // We don't bother with the IE serialization technique since it // doesn't support data: URLs var text = (new XMLSerializer()).serializeToString(canvas); var encodedText = encodeURIComponent(text); return "data:image/svg+xml," + encodedText;};// Create an <object> to display an SVG drawing using a data: URLSVG.makeObjectTag = function(canvas, width, height) { var object = document.createElement("object"); // Create HTML <object> tag object.width = width; // Set size of object object.height = height; object.data = SVG.makeDataURL(canvas); // SVG image as data: URL object.type = "image/svg+xml" // SVG MIME type return object;}</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>?? 快捷鍵說明
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