jquery+html5+canvas饼形图表特效

2024-09-05 12:18:58

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HTML5 Canvas结合jQuery共同打造实现的饼形图特效，用于数据分析时的图表显示，圆饼图同样是一款兼顾美观、直观的数据统计显示效果，本实例效果原名称为：Widgets Sold in 2010，来自国外网站，注释也是英文的，E文不好的估计也能看懂，因为里面大多数单词都很熟悉。

<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>jquery+html5饼形图特效</title><style>body{background: #fff;color: #333;font-family: "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;font-size: 0.9em;padding: 40px;}.wideBox{clear: both;text-align: center;margin-bottom: 50px;padding: 10px;background: #ebedf2;border: 1px solid #333;line-height: 80%;}#container{width: 900px;margin: 0 auto;}#chart, #chartData{border: 1px solid #333;background: #ebedf2 url(http://www.vevb.com/jscss/demoimg/201311/gradient.png) repeat-x 0 0;}#chart{display: block;margin: 0 0 50px 0;float: left;cursor: pointer;}#chartData{width: 200px;margin: 0 40px 0 0;float: right;border-collapse: collapse;box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);-moz-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);-webkit-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);background-position: 0 -100px;}#chartData th, #chartData td{padding: 0.5em;border: 1px dotted #666;text-align: left;}#chartData th{border-bottom: 2px solid #333;text-transform: uppercase;}#chartData td{cursor: pointer;}#chartData td.highlight{background: #e8e8e8;}#chartData tr: hover td{background: #f0f0f0;}</style><script src="http://www.vevb.com/ajaxjs/jquery-1.6.2.min.js"></script><script>$( pieChart );function pieChart() {  var chartSizePercent = 55;                        // The chart radius relative to the canvas width/height (in percent)  var sliceBorderWidth = 1;                         // Width (in pixels) of the border around each slice  var sliceBorderStyle = "#fff";                    // Colour of the border around each slice  var sliceGradientColour = "#ddd";                 // Colour to use for one end of the chart gradient  var maxPullOutDistance = 25;                      // How far, in pixels, to pull slices out when clicked  var pullOutFrameStep = 4;                         // How many pixels to move a slice with each animation frame  var pullOutFrameInterval = 40;                    // How long (in ms) between each animation frame  var pullOutLabelPadding = 65;                     // Padding between pulled-out slice and its label    var pullOutLabelFont = "bold 16px 'Trebuchet MS', Verdana, sans-serif";  // Pull-out slice label font  var pullOutValueFont = "bold 12px 'Trebuchet MS', Verdana, sans-serif";  // Pull-out slice value font  var pullOutValuePrefix = "$";                     // Pull-out slice value prefix  var pullOutShadowColour = "rgba( 0, 0, 0, .5 )";  // Colour to use for the pull-out slice shadow  var pullOutShadowOffsetX = 5;                     // X-offset (in pixels) of the pull-out slice shadow  var pullOutShadowOffsetY = 5;                     // Y-offset (in pixels) of the pull-out slice shadow  var pullOutShadowBlur = 5;                        // How much to blur the pull-out slice shadow  var pullOutBorderWidth = 2;                       // Width (in pixels) of the pull-out slice border  var pullOutBorderStyle = "#333";                  // Colour of the pull-out slice border  var chartStartAngle = -.5 * Math.PI;              // Start the chart at 12 o'clock instead of 3 o'clock  var canvas;                       // The canvas element in the page  var currentPullOutSlice = -1;     // The slice currently pulled out (-1 = no slice)  var currentPullOutDistance = 0;   // How many pixels the pulled-out slice is currently pulled out in the animation  var animationId = 0;              // Tracks the interval ID for the animation created by setInterval()  var chartData = [];               // Chart data (labels, values, and angles)  var chartColours = [];            // Chart colours (pulled from the HTML table)  var totalValue = 0;               // Total of all the values in the chart  var canvasWidth;                  // Width of the canvas, in pixels  var canvasHeight;                 // Height of the canvas, in pixels  var centreX;                      // X-coordinate of centre of the canvas/chart  var centreY;                      // Y-coordinate of centre of the canvas/chart  var chartRadius;                  // Radius of the pie chart, in pixels  init();  function init() {    canvas = document.getElementById('chart');    if ( typeof canvas.getContext === 'undefined' ) return;    canvasWidth = canvas.width;    canvasHeight = canvas.height;    centreX = canvasWidth / 2;    centreY = canvasHeight / 2;    chartRadius = Math.min( canvasWidth, canvasHeight ) / 2 * ( chartSizePercent / 100 );    var currentRow = -1;    var currentCell = 0;    $('#chartData td').each( function() {      currentCell++;      if ( currentCell % 2 != 0 ) {        currentRow++;        chartData[currentRow] = [];        chartData[currentRow]['label'] = $(this).text();      } else {       var value = parseFloat($(this).text());       totalValue += value;       value = value.toFixed(2);       chartData[currentRow]['value'] = value;      }      $(this).data( 'slice', currentRow );      $(this).click( handleTableClick );      if ( rgb = $(this).css('color').match( /rgb/((/d+), (/d+), (/d+)/) ) {        chartColours[currentRow] = [ rgb[1], rgb[2], rgb[3] ];      } else if ( hex = $(this).css('color').match(/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/) ) {        chartColours[currentRow] = [ parseInt(hex[1],16) ,parseInt(hex[2],16), parseInt(hex[3], 16) ];      } else {        alert( "Error: Colour could not be determined! Please specify table colours using the format '#xxxxxx'" );        return;      }    } );    var currentPos = 0; // The current position of the slice in the pie (from 0 to 1)    for ( var slice in chartData ) {      chartData[slice]['startAngle'] = 2 * Math.PI * currentPos;      chartData[slice]['endAngle'] = 2 * Math.PI * ( currentPos + ( chartData[slice]['value'] / totalValue ) );      currentPos += chartData[slice]['value'] / totalValue;    }    drawChart();    $('#chart').click ( handleChartClick );  }  function handleChartClick ( clickEvent ) {    // Get the mouse cursor position at the time of the click, relative to the canvas    var mouseX = clickEvent.pageX - this.offsetLeft;    var mouseY = clickEvent.pageY - this.offsetTop;    // Was the click inside the pie chart?    var xFromCentre = mouseX - centreX;    var yFromCentre = mouseY - centreY;    var distanceFromCentre = Math.sqrt( Math.pow( Math.abs( xFromCentre ), 2 ) + Math.pow( Math.abs( yFromCentre ),2 ) );    if ( distanceFromCentre <= chartRadius ) {      var clickAngle = Math.atan2( yFromCentre, xFromCentre ) - chartStartAngle;      if ( clickAngle < 0 ) clickAngle = 2 * Math.PI + clickAngle;      for ( var slice in chartData ) {        if ( clickAngle >= chartData[slice]['startAngle'] && clickAngle <= chartData[slice]['endAngle'] ) {          // Slice found. Pull it out or push it in, as required.          toggleSlice ( slice );          return;        }      }    }    // User must have clicked outside the pie. Push any pulled-out slice back in.    pushIn();  }  function handleTableClick ( clickEvent ) {    var slice = $(this).data('slice');    toggleSlice ( slice );  }  function toggleSlice ( slice ) {    if ( slice == currentPullOutSlice ) {      pushIn();    } else {      startPullOut ( slice );    }  }  function startPullOut ( slice ) {    if ( currentPullOutSlice == slice ) return;    currentPullOutSlice = slice;    currentPullOutDistance = 0;    clearInterval( animationId );    animationId = setInterval( function() { animatePullOut( slice ); }, pullOutFrameInterval );    $('#chartData td').removeClass('highlight');    var labelCell = $('#chartData td:eq(' + (slice*2) + ')');    var valueCell = $('#chartData td:eq(' + (slice*2+1) + ')');    labelCell.addClass('highlight');    valueCell.addClass('highlight');  }  function animatePullOut ( slice ) {    currentPullOutDistance += pullOutFrameStep;    if ( currentPullOutDistance >= maxPullOutDistance ) {      clearInterval( animationId );      return;    }    drawChart();  }  function pushIn() {    currentPullOutSlice = -1;    currentPullOutDistance = 0;    clearInterval( animationId );    drawChart();    $('#chartData td').removeClass('highlight');  }  function drawChart() {    var context = canvas.getContext('2d');    context.clearRect ( 0, 0, canvasWidth, canvasHeight );    for ( var slice in chartData ) {      if ( slice != currentPullOutSlice ) drawSlice( context, slice );    }    if ( currentPullOutSlice != -1 ) drawSlice( context, currentPullOutSlice );  }  function drawSlice ( context, slice ) {    var startAngle = chartData[slice]['startAngle']  + chartStartAngle;    var endAngle = chartData[slice]['endAngle']  + chartStartAngle;          if ( slice == currentPullOutSlice ) {      var midAngle = (startAngle + endAngle) / 2;      var actualPullOutDistance = currentPullOutDistance * easeOut( currentPullOutDistance/maxPullOutDistance, .8 );      startX = centreX + Math.cos(midAngle) * actualPullOutDistance;      startY = centreY + Math.sin(midAngle) * actualPullOutDistance;      context.fillStyle = 'rgb(' + chartColours[slice].join(',') + ')';      context.textAlign = "center";      context.font = pullOutLabelFont;      context.fillText( chartData[slice]['label'], centreX + Math.cos(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ), centreY + Math.sin(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ) );      context.font = pullOutValueFont;      context.fillText( pullOutValuePrefix + chartData[slice]['value'] + " (" + ( parseInt( chartData[slice]['value'] / totalValue * 100 + .5 ) ) +  "%)", centreX + Math.cos(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ), centreY + Math.sin(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ) + 20 );      context.shadowOffsetX = pullOutShadowOffsetX;      context.shadowOffsetY = pullOutShadowOffsetY;      context.shadowBlur = pullOutShadowBlur;    } else {      startX = centreX;      startY = centreY;    }    var sliceGradient = context.createLinearGradient( 0, 0, canvasWidth*.75, canvasHeight*.75 );    sliceGradient.addColorStop( 0, sliceGradientColour );    sliceGradient.addColorStop( 1, 'rgb(' + chartColours[slice].join(',') + ')' );    context.beginPath();    context.moveTo( startX, startY );    context.arc( startX, startY, chartRadius, startAngle, endAngle, false );    context.lineTo( startX, startY );    context.closePath();    context.fillStyle = sliceGradient;    context.shadowColor = ( slice == currentPullOutSlice ) ? pullOutShadowColour : "rgba( 0, 0, 0, 0 )";    context.fill();    context.shadowColor = "rgba( 0, 0, 0, 0 )";    if ( slice == currentPullOutSlice ) {      context.lineWidth = pullOutBorderWidth;      context.strokeStyle = pullOutBorderStyle;    } else {      context.lineWidth = sliceBorderWidth;      context.strokeStyle = sliceBorderStyle;    }    context.stroke();  }  function easeOut( ratio, power ) {    return ( Math.pow ( 1 - ratio, power ) + 1 );  }};</script></head><body><div id="container">  <div class="wideBox">    <h1>Widgets Sold in 2010</h1>  </div>  <canvas id="chart" width="600" height="500"></canvas>  <table id="chartData">    <tr>      <th>Widget</th><th>Sales ($)</th>     </tr>    <tr style="color: #0DA068">      <td>SuperWidget</td><td>1862.12</td>    </tr>    <tr style="color: #194E9C">      <td>MegaWidget</td><td>1316.00</td>    </tr>    <tr style="color: #ED9C13">      <td>HyperWidget</td><td>712.49</td>    </tr>    <tr style="color: #ED5713">      <td>WonderWidget</td><td>3236.27</td>    </tr>    <tr style="color: #057249">      <td>MicroWidget</td><td>6122.06</td>    </tr>    <tr style="color: #5F91DC">      <td>NanoWidget</td><td>128.11</td>    </tr>    <tr style="color: #F88E5D">      <td>LovelyWidget</td><td>245.55</td>    </tr>  </table></div></body></html>

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