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node_modules/we-cropper/src/methods.js 3.82 KB
ce4c83ff   wxy   初始提交
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  import {
    isFunc,
    isPlainObject
  } from './utils/tools'
  import {
    draw,
    getImageInfo,
    canvasToTempFilePath
  } from './utils/promisify'
  import CanvasToBase64 from './utils/canvas2base64'
  
  export default function methods () {
    const self = this
  
    const boundWidth = self.width // 裁剪框默认宽度,即整个画布宽度
    const boundHeight = self.height // 裁剪框默认高度,即整个画布高度
  
    const {
      id,
      targetId,
      pixelRatio
    } = self
  
    let {
      x = 0,
      y = 0,
      width = boundWidth,
      height = boundHeight
    } = self.cut
  
    self.updateCanvas = (done) => {
      if (self.croperTarget) {
        //  画布绘制图片
        self.ctx.drawImage(
          self.croperTarget,
          self.imgLeft,
          self.imgTop,
          self.scaleWidth,
          self.scaleHeight
        )
      }
      isFunc(self.onBeforeDraw) && self.onBeforeDraw(self.ctx, self)
  
      self.setBoundStyle(self.boundStyle) //	设置边界样式
  
      self.ctx.draw(false, done)
      return self
    }
  
    self.pushOrign = (src) => {
      self.src = src
  
      isFunc(self.onBeforeImageLoad) && self.onBeforeImageLoad(self.ctx, self)
  
      return getImageInfo({ src })
        .then(res => {
          let innerAspectRadio = res.width / res.height
          let customAspectRadio = width / height
  
          self.croperTarget = res.path
  
          if (innerAspectRadio < customAspectRadio) {
            self.rectX = x
            self.baseWidth = width
            self.baseHeight = width / innerAspectRadio
            self.rectY = y - Math.abs((height - self.baseHeight) / 2)
          } else {
            self.rectY = y
            self.baseWidth = height * innerAspectRadio
            self.baseHeight = height
            self.rectX = x - Math.abs((width - self.baseWidth) / 2)
          }
  
          self.imgLeft = self.rectX
          self.imgTop = self.rectY
          self.scaleWidth = self.baseWidth
          self.scaleHeight = self.baseHeight
  
          self.update()
  
          return new Promise((resolve) => {
            self.updateCanvas(resolve)
          })
        })
        .then(() => {
          isFunc(self.onImageLoad) && self.onImageLoad(self.ctx, self)
        })
    }
  
    self.getCropperBase64 = (done = () => {}) => {
      CanvasToBase64.convertToBMP({
        canvasId: id,
        x,
        y,
        width,
        height
      }, done)
    }
  
    self.getCropperImage = (opt, fn) => {
      const customOptions = opt
  
      let canvasOptions = {
        canvasId: id,
        x: x,
        y: y,
        width: width,
        height: height
      }
  
      let task = () => Promise.resolve()
  
      if (
        isPlainObject(customOptions) &&
        customOptions.original
      ) {
        // original mode
        task = () => {
          self.targetCtx.drawImage(
            self.croperTarget,
            self.imgLeft * pixelRatio,
            self.imgTop * pixelRatio,
            self.scaleWidth * pixelRatio,
            self.scaleHeight * pixelRatio
          )
  
          canvasOptions = {
            canvasId: targetId,
            x: x * pixelRatio,
            y: y * pixelRatio,
            width: width * pixelRatio,
            height: height * pixelRatio
          }
  
          return draw(self.targetCtx)
        }
      }
  
      return task()
        .then(() => {
          if (isPlainObject(customOptions)) {
            canvasOptions = Object.assign({}, canvasOptions, customOptions)
          }
  
          if (isFunc(customOptions)) {
            fn = customOptions
          }
  
          const arg = canvasOptions.componentContext
            ? [canvasOptions, canvasOptions.componentContext]
            : [canvasOptions]
  
          return canvasToTempFilePath.apply(null, arg)
        })
        .then(res => {
          const tempFilePath = res.tempFilePath
  
          return isFunc(fn)
            ? fn.call(self, tempFilePath, null)
            : tempFilePath
        })
        .catch((err) => {
          if (isFunc(fn)) {
            fn.call(self, null, err)
          } else {
            throw err
          }
        })
    }
  }