methods.js
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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
}
})
}
}