var cropper = {
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// 画布x轴起点
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cutX: 0,
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// 画布y轴起点
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cutY: 0,
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// 触摸点信息(手指与图片中心点的相对位置)
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touchRelactive: [{
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x: 0,
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y: 0
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}],
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// 双指触摸时斜边的长度
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hypotenuseLength:0,
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// 是否结束触摸
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touchEndFlag: false,
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// 画布宽高
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canvasWidth: 0,
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canvasHeight: 0,
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// 图片宽高
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imgWidth: 0,
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imgHeight: 0,
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// 图片缩放比例
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scale: 1,
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// 图片旋转角度
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angle: 0,
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// 图片上边距
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imgTop: 0,
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// 图片左边距
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imgLeft: 0,
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// 窗口宽高
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windowWidth: 0,
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windowHeight: 0,
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init: true
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}
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function bool(str) {
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return str === 'true' || str === true
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}
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function propsChange(prop, oldProp, ownerInstance, instance) {
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if (prop && prop !== 'null') {
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var params = prop.split(',')
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var type = +params[0]
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var dataset = instance.getDataset()
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if (cropper.init || type == 4) {
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cropper.canvasWidth = +dataset.width
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cropper.canvasHeight = +dataset.height
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cropper.imgTop = +dataset.windowheight / 2
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cropper.imgLeft = +dataset.windowwidth / 2
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cropper.imgWidth = +dataset.imgwidth
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cropper.imgHeight = +dataset.imgheight
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cropper.windowHeight = +dataset.windowheight
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cropper.windowWidth = +dataset.windowwidth
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cropper.init = false
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} else if (type == 2 || type == 3) {
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cropper.imgWidth = +dataset.imgwidth
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cropper.imgHeight = +dataset.imgheight
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}
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cropper.angle = +dataset.angle
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if (type == 3) {
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imgTransform(ownerInstance)
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}
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switch(type) {
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case 1:
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setCutCenter(ownerInstance)
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// 设置裁剪框大小
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computeCutSize(ownerInstance)
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// 检查裁剪框是否在范围内
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cutDetectionPosition(ownerInstance)
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break
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case 2:
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setCutCenter(ownerInstance)
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break
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case 3:
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imgMarginDetectionScale(ownerInstance)
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break
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case 4:
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imageReset(ownerInstance)
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break
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case 5:
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setCutCenter(ownerInstance)
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break
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default:
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break
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}
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}
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}
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function touchStart(event, ownerInstance) {
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var touch = event.touches || event.changedTouches
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cropper.touchEndFlag = false
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if (touch.length === 1) {
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cropper.touchRelactive[0] = {
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x: touch[0].pageX - cropper.imgLeft,
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y: touch[0].pageY - cropper.imgTop
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}
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} else {
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var width = Math.abs(touch[0].pageX - touch[1].pageX)
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var height = Math.abs(touch[0].pageY - touch[1].pageY)
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cropper.touchRelactive = [{
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x: touch[0].pageX - cropper.imgLeft,
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y: touch[0].pageY - cropper.imgTop
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},{
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x: touch[1].pageX - cropper.imgLeft,
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y: touch[1].pageY - cropper.imgTop
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}]
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cropper.hypotenuseLength = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2))
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}
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}
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function touchMove(event, ownerInstance) {
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var touch = event.touches || event.changedTouches
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if (cropper.touchEndFlag) return
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moveDuring(ownerInstance)
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if (event.touches.length === 1) {
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var left = touch[0].pageX - cropper.touchRelactive[0].x,
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top = touch[0].pageY - cropper.touchRelactive[0].y;
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cropper.imgLeft = left
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cropper.imgTop = top
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imgTransform(ownerInstance)
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imgMarginDetectionPosition(ownerInstance)
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} else {
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var dataset = event.instance.getDataset()
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var minScale = +dataset.minscale
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var maxScale = +dataset.maxscale
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var width = Math.abs(touch[0].pageX - touch[1].pageX),
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height = Math.abs(touch[0].pageY - touch[1].pageY),
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hypotenuse = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)),
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scale = cropper.scale * (hypotenuse / cropper.hypotenuseLength),
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current_deg = 0;
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scale = scale <= minScale ? minScale : scale
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scale = scale >= maxScale ? maxScale : scale
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cropper.scale = scale
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imgMarginDetectionScale(ownerInstance, true)
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var touchRelative = [{
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x: touch[0].pageX - cropper.imgLeft,
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y: touch[0].pageY - cropper.imgTop
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}, {
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x: touch[1].pageX - cropper.imgLeft,
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y: touch[1].pageY - cropper.imgTop
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}]
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cropper.touchRelactive = touchRelative
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cropper.hypotenuseLength = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2))
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// 更新视图
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cropper.angle = cropper.angle + current_deg
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imgTransform(ownerInstance)
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}
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}
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function touchEnd(event, ownerInstance) {
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cropper.touchEndFlag = true
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moveStop(ownerInstance)
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updateData(ownerInstance)
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}
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function moveDuring(ownerInstance) {
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if (!ownerInstance) return
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ownerInstance.callMethod('moveDuring')
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}
|
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function moveStop(ownerInstance) {
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if (!ownerInstance) return
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ownerInstance.callMethod('moveStop')
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}
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function setCutCenter(ownerInstance) {
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var cutX = (cropper.windowWidth - cropper.canvasWidth) * 0.5
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var cutY = (cropper.windowHeight - cropper.canvasHeight) * 0.5
|
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cropper.imgTop = cropper.imgTop - cropper.cutY + cutY
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cropper.cutY = cutY
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cropper.imgLeft = cropper.imgLeft - cropper.cutX + cutX
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cropper.cutX = cutX
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cutDetectionPosition(ownerInstance)
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imgTransform(ownerInstance)
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updateData(ownerInstance)
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}
|
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// 检测剪裁框位置是否在允许的范围内（屏幕内）
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function cutDetectionPosition(ownerInstance) {
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var windowHeight = cropper.windowHeight,
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windowWidth = cropper.windowWidth;
|
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// 检测上边距是否在范围内
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var cutDetectionPositionTop = function() {
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if (cropper.cutY < 0) {
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cropper.cutY = 0
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}
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if (cropper.cutY > windowHeight - cropper.canvasHeight) {
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cropper.cutY = windowHeight - cropper.canvasHeight
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}
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}
|
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// 检测左边距是否在范围内
|
var cutDetectionPositionLeft = function() {
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if (cropper.cutX < 0) {
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cropper.cutX = 0
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}
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if (cropper.cutX > windowWidth - cropper.canvasWidth) {
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cropper.cutX = windowWidth - cropper.canvasWidth
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}
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}
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// 裁剪框坐标处理（如果只写一个参数则另一个默认为0，都不写默认为居中）
|
if (cropper.cutX === null && cropper.cutY === null) {
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var cutX = (windowWidth - cropper.canvasWidth) * 0.5,
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cutY = (windowHeight - cropper.canvasHeight) * 0.5;
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cropper.cutX = cutX
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cropper.cutY = cutY
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} else if (cropper.cutX !== null && cropper.cutX !== null) {
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cutDetectionPositionTop()
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cutDetectionPositionLeft()
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} else if (cropper.cutX !== null && cropper.cutY === null) {
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cutDetectionPositionLeft()
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cropper.cutY = (windowHeight - cropper.canvasHeight) / 2
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} else if (cropper.cutX === null && cropper.cutY !== null) {
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cutDetectionPositionTop()
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cropper.cutX = (windowWidth - cropper.canvasWidth) / 2
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}
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}
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// 图片边缘检测-缩放
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function imgMarginDetectionScale(ownerInstance, delay) {
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var scale = cropper.scale,
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imgWidth = cropper.imgWidth,
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imgHeight = cropper.imgHeight;
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if ((cropper.angle / 90) % 2) {
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imgWidth = cropper.imgHeight
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imgHeight = cropper.imgWidth
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}
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if (imgWidth * scale < cropper.canvasWidth) {
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scale = cropper.canvasWidth / imgWidth
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}
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if (imgHeight * scale < cropper.canvasHeight) {
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scale = Math.max(scale, cropper.canvasHeight / imgHeight)
|
}
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imgMarginDetectionPosition(ownerInstance, scale, delay)
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}
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// 图片边缘检测-位置
|
function imgMarginDetectionPosition(ownerInstance, scale, delay) {
|
var left = cropper.imgLeft,
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top = cropper.imgTop,
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imgWidth = cropper.imgWidth,
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imgHeight = cropper.imgHeight;
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scale = scale || cropper.scale
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if ((cropper.angle / 90) % 2) {
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imgWidth = cropper.imgHeight
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imgHeight = cropper.imgWidth
|
}
|
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left = cropper.cutX + (imgWidth * scale) / 2 >= left ? left : cropper.cutX + (imgWidth * scale) / 2
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left = cropper.cutX + cropper.canvasWidth - (imgWidth * scale) / 2 <= left ? left : cropper.cutX + cropper.canvasWidth - (imgWidth * scale) / 2
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top = cropper.cutY + (imgHeight * scale) / 2 >= top ? top : cropper.cutY + (imgHeight * scale) / 2
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top = cropper.cutY + cropper.canvasHeight - (imgHeight * scale) / 2 <= top ? top : cropper.cutY + cropper.canvasHeight - (imgHeight * scale) / 2
|
|
cropper.imgLeft = left
|
cropper.imgTop = top
|
cropper.scale = scale
|
if (!delay || delay === 'null') {
|
imgTransform(ownerInstance)
|
}
|
}
|
|
// 改变截取值大小
|
function computeCutSize(ownerInstance) {
|
if (cropper.canvasWidth > cropper.windowWidth) {
|
cropper.canvasWidth = cropper.windowWidth
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} else if (cropper.canvasWidth + cropper.cutX > cropper.windowWidth) {
|
cropper.cutX = cropper.windowWidth - cropper.cutX
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}
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if (cropper.canvasHeight > cropper.windowHeight) {
|
cropper.canvasHeight = cropper.windowHeight
|
} else if (cropper.canvasHeight + cropper.cutY > cropper.windowHeight) {
|
cropper.cutY = cropper.windowHeight - cropper.cutY
|
}
|
}
|
|
// 图片动画
|
function imgTransform(ownerInstance) {
|
var image = ownerInstance.selectComponent('.tn-cropper__image')
|
if (!image) return
|
var x = cropper.imgLeft - cropper.imgWidth / 2,
|
y = cropper.imgTop - cropper.imgHeight / 2;
|
image.setStyle({
|
'transform': 'translate3d('+ x + 'px,' + y + 'px,0) scale(' + cropper.scale +') rotate(' + cropper.angle + 'deg)'
|
})
|
}
|
|
// 图片重置
|
function imageReset(ownerInstance) {
|
cropper.scale = 1
|
cropper.angle = 0
|
imgTransform(ownerInstance)
|
}
|
|
// 高度变化
|
function canvasHeight(ownerInstance) {
|
if (!ownerInstance) return
|
computeCutSize(ownerInstance)
|
}
|
|
// 宽度变化
|
function canvasWidth(ownerInstance) {
|
if (!ownerInstance) return
|
computeCutSize(ownerInstance)
|
}
|
|
// 更新数据
|
function updateData(ownerInstance) {
|
if (!ownerInstance) return
|
ownerInstance.callMethod('change', {
|
cutX: cropper.cutX,
|
cutY: cropper.cutY,
|
imgWidth: cropper.imgWidth,
|
imgHeight: cropper.imgHeight,
|
scale: cropper.scale,
|
angle: cropper.angle,
|
imgTop: cropper.imgTop,
|
imgLeft: cropper.imgLeft
|
})
|
}
|
|
module.exports = {
|
touchStart: touchStart,
|
touchMove: touchMove,
|
touchEnd: touchEnd,
|
propsChange: propsChange
|
}
|
