Overlay

JavaScriptHTMLCSS

import { init, registerOverlay } from 'klinecharts'
import './index.css'

function genData (timestamp = new Date().getTime(), length = 800) {
  let basePrice = 5000
  timestamp = Math.floor(timestamp / 1000 / 60) * 60 * 1000 - length * 60 * 1000
  const dataList = []
  for (let i = 0; i < length; i++) {
    const prices = []
    for (let j = 0; j < 4; j++) {
      prices.push(basePrice + Math.random() * 60 - 30)
    }
    prices.sort()
    const open = +(prices[Math.round(Math.random() * 3)].toFixed(2))
    const high = +(prices[3].toFixed(2))
    const low = +(prices[0].toFixed(2))
    const close = +(prices[Math.round(Math.random() * 3)].toFixed(2))
    const volume = Math.round(Math.random() * 100) + 10
    const turnover = (open + high + low + close) / 4 * volume
    dataList.push({ timestamp, open, high,low, close, volume, turnover })

    basePrice = close
    timestamp += 60 * 1000
  }
  return dataList
}

registerOverlay({
  name: 'circle',
  needDefaultPointFigure: true,
  needDefaultXAxisFigure: true,
  needDefaultYAxisFigure: true,
  totalStep: 3,
  createPointFigures: ({ coordinates }) => {
    if (coordinates.length === 2) {
      const xDis = Math.abs(coordinates[0].x - coordinates[1].x)
      const yDis = Math.abs(coordinates[0].y - coordinates[1].y)
      const radius = Math.sqrt(xDis * xDis + yDis * yDis)
      return {
        key: 'circle',
        type: 'circle',
        attrs: {
          ...coordinates[0],
          r: radius
        },
        styles: {
          style: 'stroke_fill'
        }
      }
    }
    return []
  }
})

const chart = init('k-line-chart')
chart.applyNewData(genData())

function createOverlay (name) {
  chart.createOverlay(name)
}

// 以下仅仅是为了协助代码演示，在实际项目中根据情况进行调整。
// The following is only for the purpose of assisting in code demonstration, and adjustments will be made according to the actual situation in the project.
const container = document.getElementById('container')
const buttonContainer = document.createElement('div')
buttonContainer.className = 'button-container'
const items = [
  { key: 'priceLine', text: '价格线(内置)-Price line(built-in)' },
  { key: 'circle', text: '圆(自定义)-Circle(custom)' }
]
items.forEach(({ key, text }) => {
  const button = document.createElement('button')
  button.innerText = text
  button.addEventListener('click', () => { createOverlay(key) })
  buttonContainer.appendChild(button)
})
container.appendChild(buttonContainer)

html

<div id="container">
  <div id="k-line-chart" style="height:430px">
</div>

css

.button-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 10px 22px;
}

.button-container button {
  padding: 2px 6px;
  background-color: #1677FF;
  border-radius: 4px;
  font-size: 12px;
  color: #fff;
  outline: none;
  border: none;
}

Overlay ​

Overlay