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html5生成柱状图(条形图)效果的实例代码

2016-03-25 11:50 866 查看

<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 = ['1月','2月','3月','4月','5月','6月','7月','8月','9月','10月','11月','12月'];

// 获取上下文

var a_canvas = document.getElementById('a_canvas');

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('月份',realwidth,realheight+12);

context.fillText('资金量',0,10);

}

},false);

})();

</script>

</html>

html5生成柱状图（条形图）详细代码

运行结果：

以上这篇html5生成柱状图(条形图)效果的实例代码就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。

原文地址：http://www.cnblogs.com/shuniuniu/p/5318666.html

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标签： HTML5 柱状图条形图

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