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基本思路：
主要是利用HTML5 Canvas实现饼图绘制，绘制弧度的API主要是使用
context.arc与lineto两个API。
实现的功能有：
1. 支持标签Legend显示或者隐藏
2. 首次载入动画效果
3. 鼠标tooltip效果
4. 自定义饼图大小与是否添加文字
效果如下：
调用代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | <html><head><meta http-equiv="X-UA-Compatible" content="chrome=IE8"><script src="js/fishcomponent.js"></script><script src="js/pie.js"></script><title>My Demo 1</title> <script> window.onload = function() { var canvas = document.getElementById("pie_canvas"); var seriesData = [{name:"apples", value:150, color:"RGBA(255,0,0,1)"}, {name:"orange", value:100, color:"RGBA(255,255,0,1)"}, {name:"banana", value:80, color:"RGBA(255,0,255,1)"}, {name:"peaches", value:60, color:"RGBA(0,255,255,1)"}, {name:"strawberries", value:40, color:"RGBA(0,127,255,1)"}] var config = { width : 600, height: 400, series: seriesData, canvas: canvas, unit: "kg", title:"Fruit Sales", tooltips : { enable : true }, animation :{ enable: true }, legend : { enable : true }, text : { enable: true }, }; pieChart.initSettings(config); pieChart.render(); } </script></head><body><h1>Pie Chart Demo</h1><div id="my_container" style="width:600px; height:500px;"> <canvas id="pie_canvas"></canvas></div><div id="btn-group"> <button type="button" id="clear-button">Clear Plot</button> <button type="button" id="refresh-button">Draw Plot</button></div></body></html> |
饼图JS的代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 | var pieChart = { width: 600, height: 400, series: [], unit: "kg", chartCanvas: null, selectable : true, title: "Pie Chart", legend : { enable : true }, edge : { width: 50, height: 50 }, animation: { enable: true, animCanvas : null, hh: 1, // trick is here!! for animation play pctx: null }, tooltips: { enable: true, tooltipCanvas : null, ttContext: null, index: -1 }, circle : { cx: 0, cy: 0, radius: 0 }, text : { enable: false, content:[] }, initSettings: function (config) { this.chartCanvas = config.canvas; this.chartCanvas.width = config.width; this.chartCanvas.height = config.height; this.width = config.width; this.height = config.height; this.series = config.series; this.title = config.title; this.unit = config.unit; if(config.tooltips != undefined) { this.tooltips.enable = config.tooltips.enable; } if(config.animation != undefined) { this.animation.enable = config.animation.enable; } if(config.legend != undefined) { this.legend.enable = config.legend.enable; } if(config.text != undefined) { this.text.enable = config.text.enable; } }, render : function() { // initialization circle this.circle.cx = this.width/2; this.circle.cy = this.height/2; this.circle.radius = Math.min(this.width/2, this.height/2) - Math.max(this.edge.width, this.edge.height); var ctx = null; if(this.animation.enable) { this.animation.animCanvas = document.createElement("canvas"); this.animation.animCanvas.width = this.width; this.animation.animCanvas.height = this.height; ctx = this.animation.animCanvas.getContext("2d"); } else { ctx = this.chartCanvas.getContext("2d"); this.renderBorder(ctx); } if(this.circle.radius <= 0) { ctx.strokeText("Can not reader the chart, Circle is too small."); return; } // draw each arc according to data series var sum = 0; var nums = this.series.length; for(var i=0; i<nums; i++) { sum += this.series[i].value; } // draw title ctx.font = '18pt Calibri'; ctx.fillText(this.title, this.width/2 - this.edge.width, 30); ctx.save(); var deltaArc = 0; for(var i=0; i<nums; i++) { var precent = this.series[i].value/sum; this.renderPie(ctx, i, precent, deltaArc); deltaArc += 2*Math.PI * precent; } ctx.restore(); // add blur shadow ctx.save(); ctx.shadowColor = "black"; ctx.shadowOffsetX = 0; ctx.shadowOffsetY = 0; ctx.shadowBlur = 10; ctx.beginPath(); ctx.arc(this.circle.cx, this.circle.cy, this.circle.radius, 0, Math.PI * 2, false); ctx.closePath(); ctx.lineWidth = 1; ctx.strokeStyle = "RGBA(127,127,127,1)"; ctx.stroke(); ctx.restore(); // render legend ctx.save(); this.renderLegend(ctx, sum); ctx.restore(); // play animation if(this.animation.enable) { var parent = this; this.animation.pctx = this.chartCanvas.getContext("2d"); this.renderBorder(this.animation.pctx); setTimeout(function() {parent.playAnimation(parent);}, 1000/20); } }, showTooltips : function(loc, ctx) { if(!this.tooltips.enable) { return; } var dx = loc.x - this.width/2; var dy = loc.y - this.height/2; var dis = Math.floor(Math.sqrt(dx * dx + dy * dy)); if(dis <= this.circle.radius) { // draw tool tip text var angle = Math.atan2(dy,dx); if(angle <= 0) { // if[-Math.PI, 0], make it[Math.PI, 2*Math.PI] angle = angle + 2*Math.PI; } var sum = 0; var nums = this.series.length; for(var s=0; s<nums; s++) { sum += this.series[s].value; } var deltaArc = 0; var index = 0; for(var i=0; i<nums; i++) { var precent = this.series[i].value/sum; deltaArc += 2*Math.PI * precent; if(angle<=deltaArc) { index = i; break; } } if(this.tooltips.tooltipCanvas == null) { this.tooltips.tooltipCanvas = document.createElement("canvas"); this.tooltips.ttContext = this.tooltips.tooltipCanvas.getContext("2d"); this.tooltips.tooltipCanvas.width = 150; this.tooltips.tooltipCanvas.height = 100; } // only draw once // if(index == this.tooltips.index){ // return; // } this.clearTooltips(ctx); this.tooltips.index = index; var m_context = this.tooltips.ttContext; m_context.save(); m_context.clearRect(0, 0, this.tooltips.tooltipCanvas.width, this.tooltips.tooltipCanvas.height); m_context.lineWidth = 2; m_context.strokeStyle = this.series[index].color; m_context.fillStyle="RGBA(255,255,255,0.7)"; // m_context.strokeRect(2, 2, this.tooltips.tooltipCanvas.width-4, this.tooltips.tooltipCanvas.height-4); // m_context.fillRect(2,2,this.tooltips.tooltipCanvas.width-4, this.tooltips.tooltipCanvas.height-4); m_context.roundRect(2,2,this.tooltips.tooltipCanvas.width-4, this.tooltips.tooltipCanvas.height-4, 5, true, true); m_context.font="14px Arial"; m_context.fillStyle="RGBA(0,0,0,1)"; m_context.fillText("Index: " + (index + 1), 5, 20); m_context.fillText(this.series[index].name + ": " + this.series[index].value + this.unit, 5, 40); m_context.fillText(this.series[index].precent, 5, 60); m_context.restore(); // make tool-tip rectangle is always visible if((loc.x + this.tooltips.tooltipCanvas.width)> this.width) { loc.x = loc.x - this.tooltips.tooltipCanvas.width; } if((loc.y - this.tooltips.tooltipCanvas.height) <= 0) { loc.y = loc.y + this.tooltips.tooltipCanvas.height; } ctx.drawImage(this.tooltips.tooltipCanvas, 0, 0, this.tooltips.tooltipCanvas.width, this.tooltips.tooltipCanvas.height, loc.x, loc.y-this.tooltips.tooltipCanvas.height, this.tooltips.tooltipCanvas.width, this.tooltips.tooltipCanvas.height); } else { this.tooltips.index = -1; this.clearTooltips(ctx); } }, clearTooltips : function(ctx) { ctx.clearRect(0,0,this.width, this.height); this.renderBorder(ctx); ctx.drawImage(this.animation.animCanvas, 0, 0, this.width, this.height, 0, 0, this.width, this.height); }, renderBorder : function(ctx) { ctx.save(); ctx.fillStyle="white"; ctx.strokeStyle="black"; ctx.fillRect(0, 0, this.width, this.height); ctx.strokeRect(0, 0, this.width, this.height); ctx.restore(); }, renderPie : function(ctx, index, precent, deltaArc) { var endAngle = deltaArc + 2*Math.PI*precent; ctx.beginPath(); ctx.arc(this.circle.cx, this.circle.cy, this.circle.radius, deltaArc, endAngle, false); ctx.moveTo(this.circle.cx, this.circle.cy); ctx.lineTo(this.circle.cx + this.circle.radius * Math.cos(deltaArc), this.circle.cy + this.circle.radius * Math.sin(deltaArc)); ctx.lineTo(this.circle.cx + this.circle.radius * Math.cos(endAngle), this.circle.cy + this.circle.radius * Math.sin(endAngle)); ctx.lineTo(this.circle.cx, this.circle.cy); ctx.closePath(); ctx.fillStyle = this.series[index].color; ctx.fill(); // render text content if(this.text.enable) { var halfEndAngle = deltaArc + Math.PI*precent; var hx = this.circle.cx + this.circle.radius * Math.cos(halfEndAngle); var hy = this.circle.cy + this.circle.radius * Math.sin(halfEndAngle); ctx.beginPath(); ctx.moveTo(hx, hy); var linePos = (hx < this.circle.cx) ? (hx - this.edge.width) : (hx + this.edge.width); ctx.lineTo(linePos, hy); ctx.closePath(); ctx.strokeStyle="black"; ctx.stroke(); var textPos = (hx < this.circle.cx) ? (hx - this.edge.width*2) : (hx + this.edge.width); precent = Math.round (precent*100) / 100; var size = this.text.content.length; var tipStr = (size > index) ? this.text.content[index] : this.series[index].name + ": " + (precent * 100).toFixed(0) + "%"; ctx.font = '10pt Calibri'; ctx.fillStyle="black"; ctx.fillText(tipStr, textPos, hy); } }, renderLegend : function(ctx, sum) { if(!this.legend.enable) return; var nums = this.series.length; ctx.font = '10pt Calibri'; var pos = (this.width/2 > (this.circle.radius+50)) ? 50 : (this.circle.cx - this.circle.radius); for(var i=0; i<nums; i++) { var x = this.series[i].value/sum; x = Math.round (x*100) / 100; var tipStr = this.series[i].name + ": " + (x * 100).toFixed(0) + "%"; this.series[i].precent = tipStr; ctx.fillStyle = this.series[i].color; ctx.fillRect(pos - 40, 20*i+10, 10, 10); ctx.fillStyle = "black"; ctx.fillText(tipStr, pos - 25, 20*i+20); } }, playAnimation : function(parent) { if(parent.animation.hh < parent.height) { parent.animation.pctx.save(); parent.animation.pctx.globalAlpha=0.5; parent.animation.pctx.clearRect(0,0,parent.width, parent.height); parent.renderBorder(parent.animation.pctx); parent.animation.pctx.drawImage(parent.animation.animCanvas, 0, 0, parent.width, this.animation.hh, 0, 0, parent.width, this.animation.hh); parent.animation.hh = parent.animation.hh + 10; parent.animation.pctx.restore(); setTimeout(function() {parent.playAnimation(parent);}, 1000/20); } else { parent.animation.pctx.clearRect(0,0,parent.width, parent.height); parent.renderBorder(parent.animation.pctx); parent.animation.pctx.drawImage(parent.animation.animCanvas, 0, 0, parent.width, parent.height, 0, 0, parent.width, parent.height); // enable tool-tip functionality if(parent.animation.enable && parent.legend.enable) { parent.chartCanvas.addEventListener('mousemove', function(event) { var x = event.pageX; var y = event.pageY; var canvas = event.target; var bbox = canvas.getBoundingClientRect(); var loc = { x: x - bbox.left * (canvas.width / bbox.width), y: y - bbox.top * (canvas.height / bbox.height)}; parent.showTooltips(loc, (parent.animation.enable ? parent.animation.pctx : ctx)); }, false); } } }, }; |