<template>
  <div>
       <canvas id="canvas" width="166" height="166"></canvas>
  </div>
<template>

export default {
 data () {
    return {
       isColor: 'red',//印章颜色
       checked: '', // 横向文
       checked1: '', // 下弦文
       shape: 1, // 印章形状(1.方形 2.圆形 )
       sealType: '3', // 印章类型(1.公章 2.法人章 3.财务专属章)
  },
  methods: {
      //圆形印章
    createSeal (id, company, name) {
      let canvas = document.getElementById(id)
      let context = canvas.getContext('2d')
     // 绘画边框
      let width = canvas.width / 2
      let height = canvas.height / 2
      context.lineWidth = 7
      context.strokeStyle = this.isColor
      context.beginPath()
      context.arc(width, height, width - 7, 0, Math.PI * 2)
      context.stroke()
      // 画五角星
      create5star(context, width, height, 10, this.isColor, 0)
      // 绘制印章名称
      context.font = '10px Helvetica'
      context.textBaseline = 'middle'// 设置文本的垂直对齐方式
      context.textAlign = 'center' // 设置文本的水平对对齐方式
      context.lineWidth = 1
      context.fillStyle = this.isColor
      context.fillText(this.transverseWord, width, height + 40) // 绘画文字(横行文)
      context.font = '8px Helvetica'
      context.fillText(this.downWord, width, height + 60) // 绘画文字(下弦文)
     // 绘制印章单位
      context.translate(width, height)// 平移到此位置,
      context.font = '14px Helvetica'
      let count = company.length// 字数
      let angle = 4 * Math.PI / (3 * (count - 1))// 字间角度
      let chars = company.split('')
      let c
      for (let i = 0; i < count; i++) {
        c = chars[i]// 需要绘制的字符
        if (i == 0) { context.rotate(5 * Math.PI / 6) } else { context.rotate(angle) }
        context.save()
        context.translate(60, 0)// 平移到此位置,此时字和x轴垂直
        context.rotate(Math.PI / 2)// 旋转90度,让字平行于x轴
        context.fillText(c, 0, 5)// 此点为字的中心点
        context.restore()
      }
        // 绘制五角星
        /**
     * 创建一个五角星形状. 该五角星的中心坐标为(sx,sy),中心到顶点的距离为radius,rotate=0时一个顶点在对          称轴上
   * rotate:绕对称轴旋转rotate弧度
   */
      function create5star (context, sx, sy, radius, color, rotato) {
        context.save()
        context.fillStyle = color
        context.translate(sx, sy)// 移动坐标原点
        context.rotate(Math.PI + rotato)// 旋转
        context.beginPath()// 创建路径
        let x = Math.sin(0)
        let y = Math.cos(0)
        let dig = Math.PI / 5 * 4
        for (let i = 0; i < 5; i++) { // 画五角星的五条边
          let x = Math.sin(i * dig)
          let y = Math.cos(i * dig)
          context.lineTo(x * radius, y * radius)
          // context.lineTo()
        }
        context.closePath()
        context.stroke()
        context.fill()
        context.restore()
      }
  }，
//方形印章
  createSealSquare（）{
        // // 获取画布
      let canvas = document.getElementById('canvas')
      let context = canvas.getContext('2d')

      let centerPoint = canvas.width / 2
      // 名称
      let personName = sealData.sealCompany || '李四'
      // 字体
      let fontFamily = 'Helvetica'
      // 颜色
      let color = this.isColor
      // 边框线宽度
      let personLineWidth = 4
      // 字体大小
      let personNameFontSize = 65
      // 字与边框的距离
      let lineTextGap = 0
      let leftTopPointX = 2.4 * (personNameFontSize + lineTextGap)
      let leftTopPointY = (personNameFontSize + lineTextGap)
      // 矩形宽高
      let wide = 2 * (personNameFontSize + lineTextGap)
      let high = 2 * (personNameFontSize + lineTextGap)
      // 字体加粗
      let fontWeight = 'bold'
      let textPoint = personNameFontSize / 2
      let length = personName.length
      if (length < 2 || length > 4) {
        alert('名称只能为2~4个字符！')
        throw new RangeError('名称只能为2~4个字符！')
      }
      if (typeof personName !== 'string') {
        alert('只能是字符串！')
        throw new TypeError('只能是字符串！')
      }
      switch (length) {
        case 2:
          personName += '之印'
          break
        case 3:
          personName += '印'
          break
      }
      context.save()
      context.fillStyle = color
      context.textBaseline = 'middle'
      context.textAlign = 'center'
      context.font = 'normal normal bold ' + personNameFontSize + 'px ' + fontFamily
      context.translate(canvas.width / 2, canvas.width / 2)
      context.fillText(personName.charAt(0), textPoint, -textPoint)
      context.fillText(personName.charAt(1), textPoint, textPoint)
      context.fillText(personName.charAt(2), -textPoint, -textPoint)
      context.fillText(personName.charAt(3), -textPoint, textPoint)
      context.restore()

      // 绘制正方形
      context.fillStyle = color
      context.strokeStyle = this.isColor
      context.lineWidth = 15
      context.rect(0.5 * (canvas.width - 166), 0.5 * (canvas.height - 166), 166, 166)
      context.stroke()
  }，
    //  (方形印)
    createSealSquareFinance (name) {
      let canvas = document.getElementById('canvas')
      let context = canvas.getContext('2d')

      // 绘制正方形
      context.lineWidth = 15
      context.strokeStyle = this.isColor
      context.strokeRect(0.5 * (canvas.width - 166), 0.5 * (canvas.height - 166), 166, 166)

      // 绘制文字
      context.fillStyle = this.isColor
      context.textBaseline = 'middle'
      context.textAlign = 'left'
      context.font = 'normal normal bold 25px Helvetica'
      context.translate(canvas.width / 2, canvas.width / 2)
      context.fillText('财', -60, -45)
      context.fillText('务', -60, -15)
      context.fillText('专', -60, 15)
      context.fillText('用', -60, 45)
      context.font = 'normal normal bold 16px Helvetica'
      context.translate(canvas.width / 2, canvas.width / 2)

      let count = name.length// 字数
      let y = -120
      let x = -90
      for (let i = 0; i < count; i++) {
        if (x === -90) {
          y = -120 + (i * 20)
        } else if (x === -70) {
          y = -120 + ((i - 5) * 20)
        } else if (x === -50) {
          y = -120 + ((i - 10) * 20)
        } else if (x === -30) {
          y = -120 + ((i - 15) * 20)
        }

        if (y === -20 && x === -90) { // 第一列的坐标
          y = -120
          x = -70
        } else if (y === -20 && x === -70) { // 第二列的坐标
          y = -120
          x = -50
        } else if (y === -20 && x === -50) { // 第三列的坐标
          y = -120
          x = -30
        }

        context.fillText(name[i], x, y)
      }
    },

}