我们到底能走多远系列（34）
扯淡：
送给各位一段话：
人生是一个不断做加法的过程
从赤条条无牵无挂的来
到学会荣辱羞耻 礼仪规范
再到赚取世间的名声 财富 地位
但是人生还要学会做减法
财富名声这些身外之物有一天会失去
朋友 亲人终有一天会离你而去
我们自己会衰老 迟钝
最后赤条条的离开这个世界
我们都不太擅长做人生的减法
很难学会放下
放不下面子 所以要打肿脸充胖子
放不下逝去的情感 就会沉溺其中 痛苦不堪
放不下输赢 所以总是如履薄冰 心惊胆战
佛说 我执 是痛苦的根源
人生要学会 断 舍 离
断绝不需要的东西
舍弃多余的废物
脱离对物品的执念
所以想幸福 请先放下
主题：
最近想用html5来话图表，就接触了下，发现html5 是一个总称而已，进去后里面分成各种标签比如：HTML5 Video，HTML5 Audio，HTML5 Canvas等等，各不相关，所以学习起来也不复杂，比如我想画图表就先学习下Canvas就好了。
所以，我感觉这东西也就是调下api，没什么太大的难度，难得地方是要实现一个东西还需要学习css，javascript这些东西才行。
自己画的线图: 用一个function包起来，是为了简单的封装一下内部的变量。
需要注意的是代码依赖jquery。
这是一个比较初步的实现，对于canvas上画图，其实直接理解成现实中那笔在话就可以了，像下面的线图，先画好x y 轴，然后再话线，再来画事件现实文字。画面变化的产生目前我发现的是用clearRect方法先清空画面，然后重画....
function lineChart(data){
var xPadding = 60;//x轴离边框的距离
var yPadding = 50;//y轴离边框的距离
var canvasWidth;
var canvasHeight;
var xAxisLength; //x轴长度
var yAxisLength; //y轴长度
var xTextColour = "#000000"; // x轴字体颜色
var yTextColour = "#000000"; // y轴字体颜色
var dotsColour = "#183487"; // 图标点的颜色
var lineWidth = 2 //线宽度
var lineColour = "#194E9C"; // 线颜色
var lineShadowColour = "rgba( 0, 0, 0, .5 )"; // 线阴影颜色
var lineShadowBlur = 15;
var lineShadowOffsetX = 3;
var lineShadowOffsetY = 3;
var xyColour = "#4B0082"; //xy轴颜色
var xToTextlength = 20; //x轴和文字的间距
var yToTextlength = 10; //y轴和文字的间距
var yTextNum = 6; //y轴和文字数量
var chartLineFont = "bold 16px 'Trebuchet MS', Verdana, sans-serif";// xy轴字体
var chooseDotTextFont = "bold 16px 'Trebuchet MS', Verdana, sans-serif";//显示提示字体
var dotsToDotsXLength; //x轴间距
var dotsXArray = [];
var divideXArray = []; //分割每个点的竖切线的x坐标
var lineChart; // The canvas element in the page
init(data);
function init(data){
lineChart = document.getElementById('lineChart');
// Initialise some properties of the canvas and chart
canvasWidth = lineChart.width;
canvasHeight = lineChart.height;
xAxisLength = canvasWidth - 2*xPadding;
yAxisLength = canvasHeight - 2*yPadding;
dotsToDotsXLength = xAxisLength / data.length;
drawLineChart();
// 添加事件
$('#lineChart').mousemove(handleDotsMousemoveEvent);
}
function drawLineChart(index){
var c = lineChart.getContext('2d');
// Clear the canvas, ready for the new frame
c.clearRect ( 0, 0, canvasWidth, canvasHeight );
c.lineWidth = lineWidth;
c.strokeStyle = xyColour;
// Draw the axises
c.beginPath();
c.moveTo(xPadding, yPadding);
// y轴
c.lineTo(xPadding, lineChart.height - yPadding);
// x轴
c.lineTo(lineChart.width - yPadding, lineChart.height - yPadding);
c.stroke();
// Draw the the background line
c.beginPath();
c.strokeStyle = '#D9D6D6';
for(var i = 0; i <= getMaxYPoint(getMaxY()); i += getYSpace()) {
if(i != 0){
c.moveTo(xPadding + 2, getYPixel(i));
c.lineTo(xPadding + xAxisLength + 2, getYPixel(i));
}
}
c.stroke();
// Draw the X value texts
c.font = chartLineFont;
c.fillStyle = xTextColour;
c.textAlign = "center";
var step = parseInt(data.length/yTextNum);
for(var i = 0; i < data.length; i =i + step) {
c.fillText(data[i].X, getXPixel(i), lineChart.height - yPadding + xToTextlength);
}
// Draw the Y value texts
c.textAlign = "right";
c.textBaseline = "middle";
c.fillStyle = yTextColour;
for(var i = 0; i <= getMaxYPoint(getMaxY()); i += getYSpace()) {
c.fillText(formatNum(i), xPadding - yToTextlength, getYPixel(i));
}
// Draw the line graph
drawLineAndDots(c, index);
}
/**
* 画线
* @param c
* @param index
*/
function drawLineAndDots(c, index){
c.beginPath();
c.strokeStyle = lineColour;
c.moveTo(getXPixel(0), getYPixel(data[0].value));
for(var i = 1; i < data.length; i ++) {
// 使用直线
//c.lineTo(getXPixel(i), getYPixel(data[i].value));
//var cps = getControlPoints(getXPixel(i-1),getYPixel(data[i-1].value),getXPixel(i),getYPixel(data[i].value));
//为了更美观一点 使用了弯曲的线
c.bezierCurveTo(getXPixel(i-1)+9,getYPixel(data[i-1].value)+9,getXPixel(i)-9,getYPixel(data[i].value)-9,getXPixel(i), getYPixel(data[i].value))
/**
// 线的阴影部分
c.shadowBlur = lineShadowBlur;
c.shadowOffsetX = lineShadowOffsetX;
c.shadowOffsetY = lineShadowOffsetY;
c.shadowColor = lineShadowColour;
**/
}
c.stroke();
c.shadowColor = "rgba( 0, 0, 0, 0 )";
c.closePath();
// Draw the dots
c.fillStyle = dotsColour;
for(var i = 0; i < data.length; i ++) {
// 有点中的节点
if(i == index){
c.beginPath();
c.arc(getXPixel(i), getYPixel(data[i].value), 8, 0, Math.PI * 2, true);
c.fill();
c.textAlign = "center";
c.font = chooseDotTextFont;
c.fillText(data[i].X, xAxisLength + xPadding + 5 , 20 )
c.fillText(data[i].value, xAxisLength + xPadding + 5 , 40 )
}else{
c.beginPath();
c.arc(getXPixel(i), getYPixel(data[i].value), 4, 0, Math.PI * 2, true);
c.fill();
}
divideXArray[i] = getXPixel(i) + dotsToDotsXLength/2;
}
}
function getMaxY() {
var max = 0;
for(var i = 0; i < data.length; i ++) {
if(data[i].value > max) {
max = data[i].value;
}
}
max += 10 - max % 10;
return max;
}
/**
* 计算x轴间距
* @param val
* @returns {number}
*/
function getXPixel(val) {
return (dotsToDotsXLength) * val + (xPadding * 1.5);
}
/**
* 计算y轴间距
* @param val
* @returns {number}
*/
function getYPixel(val) {
return lineChart.height - ((yAxisLength / getMaxYPoint(getMaxY())) * val) - yPadding;
}
/**
* 计算Y轴显示最大值
* 输入1234 输出2000
* @param maxY
*/
function getMaxYPoint(maxY){
var firstDigit = parseInt((maxY + '').substring(0,1)) + 1;
var digitNum = parseInt((maxY+"").length);
for(var i = 1; i<digitNum; i++){
firstDigit = firstDigit *10
}
return firstDigit;
}
/**
* 计算Y轴坐标增加数量
* @returns {number}
*/
function getYSpace(){
return getMaxYPoint(getMaxY())/5;
}
/**
* 格式化:三位数字加逗号
* @param num
* @returns {*}
*/
function formatNum(num){
if(!/^(\+|-)?\d+(\.\d+)?$/.test(num)){
alert("wrong!");
return num;
}
var re = new RegExp();
re.compile("(\\d)(\\d{3})(,|\\.|$)");
num += "";
while(re.test(num)){
num = num.replace(re, "$1,$2$3")
}
return num;
}
//鼠标事件
function handleDotsMousemoveEvent(mousemoveEvent){
//取得鼠标位置
var mouseX = mousemoveEvent.pageX - this.offsetLeft;
var dot = 0;
if(0 < mouseX && mouseX< xPadding){
return;
}
if((xPadding + xAxisLength) < mouseX){
return;
}
for(var i=0; i<divideXArray.length; i++){
if(mouseX < divideXArray[i]){
dot = i;
break;
}
}
drawLineChart(dot);
}
}
效果：
饼图：
里面有详细的解释。
注意以上网站上的源码无法直接使用所以 本人进行了部分的修改，以实现能够动态的处理后台传输的数据，并增加一个栏目，使功能完整。可以直接作为插件放入项目。
修改后的代码：（直接保存html文件即可）
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Pie Chart with HTML5 and jQuery - 1.0</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" > <style> body {
background: #fff;
color: #333;
font-family: "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;
font-size: 0.9em;
padding: 40px;
} #container {
width: 900px;
margin: 0 auto;
} .chart, .chartData {
border: 1px solid #333;
background: #ebedf2 url("images/gradient.png") repeat-x 0 0;
} .chart {
display: block;
margin: 0 0 50px 0;
float: left;
cursor: pointer;
} .chartData {
width: 200px;
margin: 0 40px 0 0;
float: right;
border-collapse: collapse;
box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);
-moz-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);
-webkit-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);
background-position: 0 -100px;
} .chartData th, .chartData td {
padding: 0.5em;
border: 1px dotted #666;
text-align: left;
} .chartData th {
border-bottom: 2px solid #333;
text-transform: uppercase;
} .chartData td {
cursor: pointer;
} .chartData td.highlight {
background: #e8e8e8;
} .chartData tr:hover td {
background: #f0f0f0;
} </style> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<!--[if IE]>
<script src="http://explorercanvas.googlecode.com/svn/trunk/excanvas.js"></script>
<![endif]-->
</head>
<body> <div id="container"> <canvas id="chart" width="600" height="500" class="chart"></canvas> <table id="chartData" class="chartData">
<tr><th>Widget</th><th>Sales ($)</th><th>prcent (%)</th></tr>
</table> </div> </body>
</html>
<script>
var data=[{label:"SuperWidget",value:1862.12},{label:"MegaWidget1",value:1316.00},{label:"redasd",value:1300.00},{label:"hope",value:300.00},{label:"hack",value:300.00},{label:"MegaWidget",value:1316.00},{label:"redasd",value:1300.00},{label:"hope",value:300.00},{label:"hack",value:300.00}];
// Run the code when the DOM is ready
//$( pieChart );
pieChart(data, 'chart', 'chartData'); function pieChart(data, chartElementId, chartTableElementId) { // Config settings
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 // Declare some variables for the chart
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 = data; // 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 var chartElementId = chartElementId; // 圆饼元素id
var chartTableElementId = chartTableElementId; // 数据表格元素id // Set things up and draw the chart
init(); /**
* Set up the chart data and colours, as well as the chart and table click handlers,
* and draw the initial pie chart
*/ function init() {
var colors=['#FF4500','#0DA068','#194E9C','#ED9C13','#ED5713','#CD00CD','#7A378B','#B8860B','#8B2500','#9932CC','#5F91DC','#F88E5D','#0000FF','#B3EE3A','#7A378B','#FF1493','#F5DA81','#80FF00','#173B0B','#0B3B39','#0B0B3B','#A901DB','#6E6E6E','#5F04B4','#01DFD7','#A31A1A','#1A653C','#A49D0C','#790CA4','#CA80E8','#6E87D7','#D76ED2','#D7B86E','#49543B','#9EEBE8','#9ED9EB','#549B21']
// Get the canvas element in the page
canvas = document.getElementById(chartElementId); // Exit if the browser isn't canvas-capable
if ( typeof canvas.getContext === 'undefined' ) return; // Initialise some properties of the canvas and chart
canvasWidth = canvas.width;
canvasHeight = canvas.height;
centreX = canvasWidth / 2;
centreY = canvasHeight / 2;
chartRadius = Math.min( canvasWidth, canvasHeight ) / 2 * ( chartSizePercent / 100 ); // Grab the data from the table,
// and assign click handlers to the table data cells var currentRow = 0;
var currentCell = 0;
//$('#chartData').append('<tr><th>Widget</th><th>Sales ($)</th><th>prcent (%)</th></tr>')
$.each(chartData, function(index,value){
totalValue += value.value;
});
$.each(chartData, function(index,value){
$('#'+chartTableElementId).append('<tr style="color: '+colors[index]+'"><td>'+value.label+'</td><td>'+value.value+'</td><td>'+ ( value.value / totalValue * 100 + .5 ).toFixed(2) + '%'+'</td></tr>') }); $('#'+chartTableElementId+' td').each( function() {
currentCell++;
// Store the slice index in this cell, and attach a click handler to it
$(this).data( 'slice', currentRow );
$(this).click( handleTableClick );
// Extract and store the cell colour
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;
}
if(currentCell % 3 == 0){
currentRow++;
}
} ); // Now compute and store the start and end angles of each slice in the chart data 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;
} // All ready! Now draw the pie chart, and add the click handler to it
drawChart();
$('#'+chartElementId).click ( handleChartClick );
} /**
* Process mouse clicks in the chart area.
*
* If a slice was clicked, toggle it in or out.
* If the user clicked outside the pie, push any slices back in.
*
* @param Event The click event
*/ 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 ) { // Yes, the click was inside the chart.
// Find the slice that was clicked by comparing angles relative to the chart centre. 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();
} /**
* Process mouse clicks in the table area.
*
* Retrieve the slice number from the jQuery data stored in the
* clicked table cell, then toggle the slice
*
* @param Event The click event
*/ function handleTableClick ( clickEvent ) {
var slice = $(this).data('slice');
toggleSlice ( slice );
} /**
* Push a slice in or out.
*
* If it's already pulled out, push it in. Otherwise, pull it out.
*
* @param Number The slice index (between 0 and the number of slices - 1)
*/ function toggleSlice ( slice ) {
if ( slice == currentPullOutSlice ) {
pushIn();
} else {
startPullOut ( slice );
}
} /**
* Start pulling a slice out from the pie.
*
* @param Number The slice index (between 0 and the number of slices - 1)
*/ function startPullOut ( slice ) { // Exit if we're already pulling out this slice
if ( currentPullOutSlice == slice ) return; // Record the slice that we're pulling out, clear any previous animation, then start the animation
currentPullOutSlice = slice;
currentPullOutDistance = 0;
clearInterval( animationId );
animationId = setInterval( function() { animatePullOut( slice ); }, pullOutFrameInterval ); // Highlight the corresponding row in the key table
$('#'+chartTableElementId+' td').removeClass('highlight');
var labelCell = $('#'+chartTableElementId+' td:eq(' + (slice*3) + ')');
var valueCell = $('#'+chartTableElementId+' td:eq(' + (slice*3+1) + ')');
var prcentCell = $('#'+chartTableElementId+' td:eq(' + (slice*3+2) + ')');
labelCell.addClass('highlight');
valueCell.addClass('highlight');
prcentCell.addClass('highlight');
} /**
* Draw a frame of the pull-out animation.
*
* @param Number The index of the slice being pulled out
*/ function animatePullOut ( slice ) { // Pull the slice out some more
currentPullOutDistance += pullOutFrameStep; // If we've pulled it right out, stop animating
if ( currentPullOutDistance >= maxPullOutDistance ) {
clearInterval( animationId );
return;
} // Draw the frame
drawChart();
} /**
* Push any pulled-out slice back in.
*
* Resets the animation variables and redraws the chart.
* Also un-highlights all rows in the table.
*/ function pushIn() {
currentPullOutSlice = -1;
currentPullOutDistance = 0;
clearInterval( animationId );
drawChart();
$('#'+chartTableElementId+' td').removeClass('highlight');
} /**
* Draw the chart.
*
* Loop through each slice of the pie, and draw it.
*/ function drawChart() { // Get a drawing context
var context = canvas.getContext('2d'); // Clear the canvas, ready for the new frame
context.clearRect ( 0, 0, canvasWidth, canvasHeight ); // Draw each slice of the chart, skipping the pull-out slice (if any)
for ( var slice in chartData ) {
if ( slice != currentPullOutSlice ) drawSlice( context, slice );
} // If there's a pull-out slice in effect, draw it.
// (We draw the pull-out slice last so its drop shadow doesn't get painted over.)
if ( currentPullOutSlice != -1 ) drawSlice( context, currentPullOutSlice );
} /**
* Draw an individual slice in the chart.
*
* @param Context A canvas context to draw on
* @param Number The index of the slice to draw
*/ function drawSlice ( context, slice ) { // Compute the adjusted start and end angles for the slice
var startAngle = chartData[slice]['startAngle'] + chartStartAngle;
var endAngle = chartData[slice]['endAngle'] + chartStartAngle; if ( slice == currentPullOutSlice ) { // We're pulling (or have pulled) this slice out.
// Offset it from the pie centre, draw the text label,
// and add a drop shadow. 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'] + " (" + ( chartData[slice]['value'] / totalValue * 100 + .5 ).toFixed(2) + "%)", 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 { // This slice isn't pulled out, so draw it from the pie centre
startX = centreX;
startY = centreY;
} // Set up the gradient fill for the slice
var sliceGradient = context.createLinearGradient( 0, 0, canvasWidth*.75, canvasHeight*.75 );
sliceGradient.addColorStop( 0, sliceGradientColour );
sliceGradient.addColorStop( 1, 'rgb(' + chartColours[slice].join(',') + ')' ); // Draw the slice
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 )"; // Style the slice border appropriately
if ( slice == currentPullOutSlice ) {
context.lineWidth = pullOutBorderWidth;
context.strokeStyle = pullOutBorderStyle;
} else {
context.lineWidth = sliceBorderWidth;
context.strokeStyle = sliceBorderStyle;
} // Draw the slice border
context.stroke();
} /**
* Easing function.
*
*
* @param Number The ratio of the current distance travelled to the maximum distance
* @param Number The power (higher numbers = more gradual easing)
* @return Number The new ratio
*/ function easeOut( ratio, power ) {
return ( Math.pow ( 1 - ratio, power ) + 1 );
}
}; </script>
总结：
1,我们完全可以只利用API画出自己想要的东西：API
3，阅读网站：http://diveintohtml5.info/
4，不管html5以后发不发展，学点然后做个比较复杂的动画玩玩，也不错
补充：
鉴于项目压力，为了竟可能满足需求，可能最终我们不得不选择网上更加成熟的框架，但无论如何，本人还是希望能够完善出一个比较好的图表框架出来。
让我们继续前行
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努力不一定成功，但不努力肯定不会成功。
共勉。