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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 22-10 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 22-10 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><!-- HTML documents that use VML must declare a namespace for it --><html xmlns:v="urn:schemas-microsoft-com:vml"><head><!-- This is how we associate VML behavior with the VML namespace --><style>v\:* { behavior: url(#default#VML); }</style><script>/* * Create and return a VML <v:group> element in which VML drawing can be done. * Note that the returned element has not yet been added to the document. */function makeVMLCanvas(id, pixelWidth, pixelHeight) { var vml = document.createElement("v:group"); vml.setAttribute("id", id); vml.style.width = pixelWidth + "px"; vml.style.height = pixelHeight + "px"; vml.setAttribute("coordsize", pixelWidth + " " + pixelHeight); // Start with a white rectangle with a thin black outline. var rect = document.createElement("v:rect"); rect.style.width = pixelWidth + "px"; rect.style.height = pixelHeight + "px"; vml.appendChild(rect); return vml;}/* Draw a pie chart in a VML canvas */function pieChart(canvas, data, cx, cy, r, colors, labels, lx, ly) { // Get the canvas element if specified by id if (typeof canvas == "string") canvas = document.getElementById(canvas); // Add up the data values var total = 0; for(var i = 0; i < data.length; i++) total += data[i]; // Figure out the size (in degrees) of each wedge var angles = [] for(var i = 0; i < data.length; i++) angles[i] = data[i]/total*360; // Now loop through all the wedges // VML measures angles in degrees/65535 and goes // counter-clockwise from 3 o'clock startangle = 90; // Start at 12 o'clock. for(var i = 0; i < data.length; i++) { // Tweak the angles so that our pie goes clockwise from 12 o'clock. var sa = Math.round(startangle * 65535); var a = -Math.round(angles[i] * 65536); // Create a VML shape element var wedge = document.createElement("v:shape"); // VML describes the shape of a path in a similar way to SVG var path = "M " + cx + " " + cy + // Move to (cx,cy) " AE " + cx + " " + cy + " " + // Arc with center at (cx,cy) r + " " + r + " " + // Horiz and vertical radii sa + " " + a + // Start angle and total angle " X E"; // Close path to center and end wedge.setAttribute("path", path); // Set wedge shape wedge.setAttribute("fillcolor", colors[i]); // Set wedge color wedge.setAttribute("strokeweight", "2px"); // Outline width // Position the wedge using CSS styles. The coordinates of the // path are interpreted relative to this size, so we give each // shape the same size as the canvas itself. wedge.style.position = "absolute"; wedge.style.width = canvas.style.width; wedge.style.height = canvas.style.height; // Add the wedge to the canvas canvas.appendChild(wedge); // Next wedge begins where this one ends startangle -= angles[i]; // Create a VML <rect> element for the legend var icon = document.createElement("v:rect"); icon.style.left = lx + "px"; // CSS positioning icon.style.top = (ly+i*30) + "px"; icon.style.width = "20px"; // CSS size icon.style.height = "20px"; icon.setAttribute("fillcolor", colors[i]); // Same color as wedge icon.setAttribute("stroke", "black"); // Outline color icon.setAttribute("strokeweight", "2"); // Outline width canvas.appendChild(icon); // Add to canvas // VML has advanced text capabilities, but most text is simple // HTML, and is added directly to the VML canvas, using // canvas coordinates var label = document.createElement("div"); // <div> to hold the text label.appendChild(document.createTextNode(labels[i])); // the text label.style.position = "absolute"; // Position with CSS label.style.left = (lx + 30) + "px"; label.style.top = (ly + 30*i + 5) + "px"; label.style.fontFamily = "sans-serif"; // Text styles label.style.fontSize = "16px"; canvas.appendChild(label); // Add text to canvas }}function init() { var canvas = makeVMLCanvas("canvas", 600, 400); document.body.appendChild(canvas); pieChart(canvas, [12, 23, 34, 45], 200, 200, 150, ["red", "blue", "yellow", "green"], ["North", "South", "East", "West"], 400, 100);}</script></head><body onload="init()"></body></html></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>⌨️ 快捷键说明
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