thing_web/public/scada/previewScripts/HelperCirclePoint.js

// 自定义辅助分组，用来创建虚拟节点，作为自由画线的开始和结束点
const { EllipseResize } = window

class HelperCirclePointModel extends EllipseResize.model {
  initNodeData(data) {
    super.initNodeData(data)
    this.rx = 5
    this.ry = 5
    this.virtual = true
    this.draggable = false
  }

  setToBottom() {
    this.zIndex = 0
  }

  getNodeStyle() {
    const style = super.getNodeStyle()
    style.fill = 'transparent'
    style.stroke = 'transparent'

    return style
  }

  getDefaultAnchor() {
    const {
      id,
      x,
      y,
      width,
      height,
    } = this
    const anchors = [
      {
        x,
        y,
        width: 2,
        height: 2,
        id,
        type: 'right',
      },
    ]
    return anchors
  }
}

export default {
  type: 'helper-circle-point',
  model: HelperCirclePointModel,
  view: EllipseResize.view,
}