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depth-chart.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>HTML5 Canvas绘制比特币交易深度图</title>
<style type="text/css">
.layout{
position:relative;
}
.layout canvas{
position:absolute;
}
.layout #x{
top:300px;
left:0;
}
.layout #y{
top:0px;
left:600px;
}
</style>
</head>
<body>
<div class="layout">
<canvas id="depth" width="600" height="300"></canvas>
<canvas id="x" width="600" height="24"></canvas>
<canvas id="y" width="48" height="300"></canvas>
</div>
<script>
function drawDepthChart() {
var data = {
"sell":
[
{"price":9000,"amount":8176},
{"price":8999.84,"amount":10245},
{"price":8999.68,"amount":19147},
{"price":8999.52,"amount":4150},
{"price":8999.36,"amount":10420},
{"price":8999.2,"amount":16053},
{"price":8999.04,"amount":8480},
{"price":8998.88,"amount":12751},
{"price":8998.72,"amount":14187},
{"price":8998.56,"amount":7916}
],
"buy":[
{"price":8749,"amount":8379},
{"price":8748.74,"amount":18582},
{"price":8748.48,"amount":9173},
{"price":8748.22,"amount":13327},
{"price":8747.96,"amount":1990},
{"price":8747.7,"amount":3414},
{"price":8747.44,"amount":12062},
{"price":8747.18,"amount":19389},
{"price":8746.92,"amount":8999},
{"price":8746.66,"amount":8675}
]
};
for(i in data['buy']){
var total = 0;
for(n=0; n<= i; n++){
total += data['buy'][n]['amount'];
}
data['buy'][i]['total'] = total;
}
for(i in data['sell']){
var total = 0;
for(n=i; n< data['sell'].length; n++){
total += data['sell'][n]['amount'];
}
data['sell'][i]['total'] = total;
}
var gap = 10; //X轴偏移量 防止左右两部分连接以利于美观
var canvas=document.getElementById('depth');
var width = canvas.getAttribute('width');
var height = canvas.getAttribute('height');
//计算交易量的最大值，作为纵坐标的最大刻度值
var maxAmount = Math.max( data['sell'][0]['total'], data['buy'][data['buy'].length-1]['total']);
var scaleH = maxAmount / height;
//买卖各占一半宽度
var scaleW = width / 2 / data['sell'].length;
var context=canvas.getContext('2d');
//开始一个连续绘制路径
context.beginPath();
context.fillStyle = '#9dd'; //设置买入区域填充颜色
var x = y = 0;
context.moveTo(width/2-gap, height);
//从中间向上、向左绘制买单图
for(i in data['buy']){
x = width/2 - i * scaleW-gap;
y = height - data['buy'][i]['total']/maxAmount*height;
context.lineTo(x, y);
}
context.lineTo(0, y); //延伸到最左侧边缘
context.lineTo(0, height);
context.lineTo(width/2-gap, height);
context.fill(); //形成一个封装区域 并按fillStyle指定的颜色填充
context.closePath();
//同上 开始绘制卖单深度图
context.beginPath();
context.fillStyle = '#1aa';
context.moveTo(width/2+gap, height);
for(i in data['sell']){
var index =data['sell'].length - i -1;
x = width/2 + i * scaleW + gap;
y = height - data['sell'][index]['total']/maxAmount * height;
context.lineTo(x,y);
}
context.lineTo(width+gap, y);
context.lineTo(width+gap, height);
context.lineTo(width/2+gap, height);
context.fill();
context.closePath();
//X轴刻度
var contextX = document.getElementById('x').getContext('2d');
var contextY = document.getElementById('y').getContext('2d');
contextX.fillStyle = '#ccc';
contextY.fillStyle = '#ccc';
for(i in data['buy']){
if(i%3) continue;
x = width/2 - i * scaleW-30;
y = 12;
contextX.fillText(data['buy'][i]['price'], x, y);
}
for(i in data['sell']){
if(i%3) continue;
x = width/2 + i * scaleW;
y = 12;
var index =data['sell'].length - i -1;
contextX.fillText(data['sell'][index]['price'], x, y);
}
//Y轴5等份
var seg = maxAmount/5;
for(i=1; i<6; i++){
x = 12;
y = height - seg*i/maxAmount * height;
contextY.fillText(seg*i > 1000 ? (seg*i/1000+'K'): seg*i, x, y);
}
//这是作者加的版权标识 你可以去掉
context.fillText('Powered By: 月影无痕 [email protected]', 180, 100);
}
drawDepthChart();
</script>
</body>
</html>