export default class WxCanvas {
  constructor(ctx, canvasId, isNew, canvasNode) {
    this.ctx = ctx
    this.canvasId = canvasId
    this.chart = null
    this.isNew = isNew

    if (isNew) {
      this.canvasNode = canvasNode
    }

    this.chart = null
    this._init()
  }

  getContext(contextType) {
    return this.ctx
  }

  setChart(chart) {
    this.chart = chart
  }

  addEventListener() {
    // 暂不支持事件监听
  }

  removeEventListener() {
    // 暂不支持事件监听
  }

  _init() {
    const dpr = wx.getSystemInfoSync().pixelRatio
    this.ctx.scale(dpr, dpr)
  }

  // 代理 canvas 方法
  setWidth(width) {
    // Canvas 2D 不需要手动设置
  }

  setHeight(height) {
    // Canvas 2D 不需要手动设置
  }

  getWidth() {
    return this.canvasNode.width
  }

  getHeight() {
    return this.canvasNode.height
  }

  addEvtListener() {
    // 事件监听
  }

  removeEvtListener() {
    // 移除监听
  }
}