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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;
height: 600px;
}
.layout canvas{
position:absolute;
}
.layout .canvas{
background: #ffffff;
width: 600px;
height: 300px
}
.layout #x{
top:300px;
left:0;
}
.layout #y{
top:0px;
left:600px;
}
.layout #offdepth {
top: 0;
left: 0;
background: inherit;
}
</style>
</head>
<body>
<div class="layout">
<canvas id="depth" class="canvas" width="600" height="300"></canvas>
<canvas id="offdepth" class="canvas" 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 canvas=document.getElementById('depth');
var offCanvas = document.getElementById('offdepth')
window.offContext = offCanvas.getContext('2d')
const buyFillColor = '#09C989'
const sellFillColor = '#F24E4D'
offCanvas.addEventListener('mousemove', ({offsetX, offsetY}) => {
for(let key of valueMap.keys()) {
const x = key[0]
const y = key[1]
const side = key[2]
const obj = valueMap.get(key)
if (offsetX < x) {
// console.log(key, valueMap.get(key))
offContext.strokeStyle = 'rgba(200,200,200,0.5)'
offContext.lineWidth = 1
offContext.setLineDash([2])
offContext.clearRect(0,0,600,300);
offContext.beginPath()
offContext.moveTo(0, y)
offContext.lineTo(600, y)
offContext.stroke()
offContext.closePath()
offContext.beginPath()
offContext.moveTo(x, 0)
offContext.lineTo(x, 300)
offContext.stroke()
offContext.closePath()
offContext.beginPath()
offContext.shadowBlur=20;
offContext.shadowColor="rgba(0,0,0,0.8)";
// 小圆点
offContext.fillStyle = 'rgba(255,255,255, 1)'
offContext.arc(x,y,5,0,2*Math.PI);
offContext.fill()
offContext.closePath()
offContext.beginPath()
// tips框
offContext.fillStyle = 'rgba(255,255,255, 1)'
let widthOffset = 120
let heightOffset = 60
let left = x - widthOffset / 2
let top = y - heightOffset - 10
if (side === 'sell') {
// widthOffset = -widthOffset
// heightOffset = -heightOffset
}
if (left < 0) {
left = 0
}
if (left >= 600 - widthOffset) {
left = 600 - widthOffset
}
if (top <= 0) {
top = y + 10
}
offContext.fillRect(left, top, widthOffset, heightOffset);
offContext.fillStyle = side === 'buy' ? buyFillColor : sellFillColor
offContext.textAlign="left"
offContext.shadowBlur=0;
offContext.font="12px Arial";
const marginLeft = 10
const marginTop = 25
const lineHeight = 20
offContext.fillText(`委托价：${obj.price}`, left + marginLeft, top + marginTop );
offContext.fillText(`累计：${obj.total}`, left + marginLeft, top + marginTop + lineHeight);
offContext.closePath()
break;
}
}
})
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');
window.context = context
window.valueMap = new Map
var draw = (context, width, height) => {
let tempList = []
// const width = parseFloat(width) || 0
// const height = parseFloat(height) || 0
const gap = 10
context.beginPath()
context.fillStyle = buyFillColor
let x = 0
let y = 0
let maxAmount = Math.max(data['sell'][0]['total'], data['buy'][data['buy'].length - 1]['total'])
let scaleH = maxAmount / height
let scaleW = width / 2 / data['sell'].length
// context.moveTo(width / 2 - gap, height)
// 从中间向上、向左绘制买单图
for (let i in data['buy']) {
x = width / 2 - i * scaleW - gap
y = height - data['buy'][i]['total'] / maxAmount * height
tempList.push({
x,
y,
value: data['buy'][i],
side: 'buy'
})
// valueMap.set([x, y], data['buy'][i])
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 = sellFillColor
// debugger
context.moveTo(width / 2 + gap, height)
for (let i in data['buy']) {
var index =data['sell'].length - i -1;
x = width/2 + i * scaleW + gap;
y = height - data['sell'][index]['total']/maxAmount * height;
tempList.push({
x,
y,
value: data['buy'][i],
side: 'sell'
})
context.lineTo(x,y);
}
tempList = tempList.sort((a, b) => {
return a.x - b.x
})
// debugger
tempList.forEach(item => {
valueMap.set([item.x, item.y, item.side], item.value)
})
context.lineTo(width + gap, y)
context.lineTo(width + gap, height)
context.lineTo(width / 2 + gap, height)
context.fill()
// context.stroke()
context.closePath()
// X轴刻度
let contextX = document.getElementById('x').getContext('2d')
let contextY = document.getElementById('y').getContext('2d')
contextX.fillStyle = '#000'
for (let 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 (let i in data['sell']) {
if (i % 3) continue
x = width / 2 + i * scaleW
y = 12
let index = data['sell'].length - i - 1
contextX.fillText(data['sell'][index]['price'], x, y)
}
// Y轴5等份
var seg = maxAmount / 5
for (let 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)
}
}
draw(context, width, height)
}
drawDepthChart();
</script>
</body>
</html>