html5生成柱状图(条形图)效果的实例代码

百变鹏仔 3个月前 (10-18) #H5教程

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下面小编就为大家分享一篇html5生成柱状图(条形图)效果的实例代码。小编觉得挺不错的，现在分享给大家，也给大家一个参考。一起跟随小编过来看看吧

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<html><canvas id="a_canvas" width="1000" height="700"></canvas><script>    (function (){            window.addEventListener("load", function(){              var data = [1000,1300,2000,3000,2000,2000,1000,1500,2000,5000,1000,1000];              var xinforma = [&#39;1月&#39;,&#39;2月&#39;,&#39;3月&#39;,&#39;4月&#39;,&#39;5月&#39;,&#39;6月&#39;,&#39;7月&#39;,&#39;8月&#39;,&#39;9月&#39;,&#39;10月&#39;,&#39;11月&#39;,&#39;12月&#39;];              // 获取上下文              var a_canvas = document.getElementById(&#39;a_canvas&#39;);              var context = a_canvas.getContext("2d");              // 绘制背景              var gradient = context.createLinearGradient(0,0,0,300);             // gradient.addColorStop(0,"#e0e0e0");              //gradient.addColorStop(1,"#ffffff");              context.fillStyle = gradient;              context.fillRect(0,0,a_canvas.width,a_canvas.height);              var realheight = a_canvas.height-15;              var realwidth = a_canvas.width-40;              // 描绘边框              var grid_cols = data.length + 1;              var grid_rows = 4;              var cell_height = realheight / grid_rows;              var cell_width = realwidth / grid_cols;              context.lineWidth = 1;              context.strokeStyle = "#a0a0a0";              // 结束边框描绘              context.beginPath();              // 准备画横线              /*for(var row = 1; row <= grid_rows; row++){                var y = row * cell_height;                context.moveTo(0,y);                context.lineTo(a_canvas.width, y);              }*/                //划横线                context.moveTo(0,realheight);                context.lineTo(realwidth,realheight);                //画竖线              context.moveTo(0,20);               context.lineTo(0,realheight);              context.lineWidth = 1;              context.strokeStyle = "black";              context.stroke();              var max_v =0;              for(var i = 0; i<data.length; i++){                if (data[i] > max_v) { max_v =data[i]};              }              max_vmax_v = max_v * 1.1;              // 将数据换算为坐标              var points = [];              for( var i=0; i < data.length; i++){                var v= data[i];                var px = cell_width *　(i +1);                var py = realheight - realheight*(v / max_v);                //alert(py);                points.push({"x":px,"y":py});              }              //绘制坐标图形              for(var i in points){                var p = points[i];                context.beginPath();                context.fillStyle="green";                context.fillRect(p.x,p.y,15,realheight-p.y);                context.fill();              }              //添加文字              for(var i in points)              {  var p = points[i];                context.beginPath();                context.fillStyle="black";                context.fillText(data[i], p.x + 1, p.y - 15);                 context.fillText(xinforma[i],p.x + 1,realheight+12);                 context.fillText(&#39;月份&#39;,realwidth,realheight+12);                 context.fillText(&#39;资金量&#39;,0,10);                  }            },false);          })();    </script></html>

html5生成柱状图（条形图）详细代码

运行结果：

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