322 lines
8.9 KiB
XML
322 lines
8.9 KiB
XML
var cropper = {
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cutX: 0, //画布x轴起点
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cutY: 0, //画布y轴起点0
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touchRelative: [{
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x: 0,
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y: 0
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}], //手指或鼠标和图片中心的相对位置
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hypotenuseLength: 0, //双指触摸时斜边长度
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flagEndTouch: false, //是否结束触摸
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canvasWidth: 0,
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canvasHeight: 0,
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imgWidth: 0, //图片宽度
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imgHeight: 0, //图片高度
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scale: 1, //图片缩放比
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angle: 0, //图片旋转角度
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imgTop: 0, //图片上边距
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imgLeft: 0, //图片左边距
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windowHeight: 0,
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windowWidth: 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 ? true : false
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}
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function touchstart(e, ins) {
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var touch = e.touches || e.changedTouches;
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cropper.flagEndTouch = false;
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if (touch.length == 1) {
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cropper.touchRelative[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.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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{
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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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];
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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 moveDuring(ins) {
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if (!ins) return;
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ins.callMethod('moveDuring')
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}
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function moveStop(ins) {
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if (!ins) return;
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ins.callMethod('moveStop')
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};
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function setCutCenter(ins) {
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var cutY = (cropper.windowHeight - cropper.canvasHeight) * 0.5;
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var cutX = (cropper.windowWidth - cropper.canvasWidth) * 0.5;
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//顺序不能变
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cropper.imgTop = cropper.imgTop - cropper.cutY + cutY;
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cropper.cutY = cutY; //截取的框上边距
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cropper.imgLeft = cropper.imgLeft - cropper.cutX + cutX;
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cropper.cutX = cutX; //截取的框左边距
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cutDetectionPosition(ins)
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imgTransform(ins)
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updateData(ins)
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}
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function touchmove(e, ins) {
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var touch = e.touches || e.changedTouches;
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if (cropper.flagEndTouch) return;
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moveDuring(ins);
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if (e.touches.length == 1) {
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var left = touch[0].pageX - cropper.touchRelative[0].x,
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top = touch[0].pageY - cropper.touchRelative[0].y;
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cropper.imgLeft = left;
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cropper.imgTop = top;
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imgTransform(ins);
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imgMarginDetectionPosition(ins);
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} else {
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var res = e.instance.getDataset();
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var minScale = +res.minscale;
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var maxScale = +res.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(ins, 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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{
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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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];
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cropper.touchRelative = 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(ins);
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}
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}
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function touchend(e, ins) {
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cropper.flagEndTouch = true;
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moveStop(ins);
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updateData(ins)
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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(ins) {
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var windowHeight = cropper.windowHeight,
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windowWidth = cropper.windowWidth;
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var cutDetectionPositionTop = function() {
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//检测上边距是否在范围内
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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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var cutDetectionPositionLeft = function() {
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//检测左边距是否在范围内
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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，都不写默认居中）
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if (cropper.cutY == null && cropper.cutX == null) {
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var cutY = (windowHeight - cropper.canvasHeight) * 0.5;
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var cutX = (windowWidth - cropper.canvasWidth) * 0.5;
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cropper.cutY = cutY; //截取的框上边距
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cropper.cutX = cutX; //截取的框左边距
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} else if (cropper.cutY != null && cropper.cutX != null) {
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cutDetectionPositionTop();
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cutDetectionPositionLeft();
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} else if (cropper.cutY != null && cropper.cutX == null) {
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cutDetectionPositionTop();
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cropper.cutX = (windowWidth - cropper.canvasWidth) / 2;
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} else if (cropper.cutY == null && cropper.cutX != null) {
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cutDetectionPositionLeft();
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cropper.cutY = (windowHeight - cropper.canvasHeight) / 2;
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}
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}
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/**
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* 图片边缘检测-缩放
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*/
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function imgMarginDetectionScale(ins, delay) {
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var scale = cropper.scale;
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var imgWidth = cropper.imgWidth;
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var 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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}
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imgMarginDetectionPosition(ins, scale, delay);
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}
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/**
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* 图片边缘检测-位置
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*/
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function imgMarginDetectionPosition(ins, scale, delay) {
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var left = cropper.imgLeft;
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var top = cropper.imgTop;
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scale = scale || cropper.scale;
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var imgWidth = cropper.imgWidth;
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var 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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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 -
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(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 -
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(imgHeight * scale) / 2;
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cropper.imgLeft = left;
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cropper.imgTop = top;
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cropper.scale = scale;
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if (!delay || delay === 'null') {
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imgTransform(ins);
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}
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}
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//改变截取框大小
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function computeCutSize(ins) {
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if (cropper.canvasWidth > cropper.windowWidth) {
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cropper.canvasWidth = cropper.windowWidth;
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} else if (cropper.canvasWidth + cropper.cutX > cropper.windowWidth) {
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cropper.cutX = cropper.windowWidth - cropper.cutX;
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}
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if (cropper.canvasHeight > cropper.windowHeight) {
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cropper.canvasHeight = cropper.windowHeight;
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} else if (cropper.canvasHeight + cropper.cutY > cropper.windowHeight) {
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cropper.cutY = cropper.windowHeight - cropper.cutY;
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}
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}
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function imgTransform(ins) {
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var owner = ins.selectComponent('.tui-cropper__image')
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if (!owner) return
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var x = cropper.imgLeft - cropper.imgWidth / 2;
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var y = cropper.imgTop - cropper.imgHeight / 2;
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owner.setStyle({
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'transform': 'translate3d(' + x + 'px,' + y + 'px,0) scale(' + cropper.scale + ') rotate(' + cropper.angle + 'deg)'
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})
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}
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function imageReset(ins) {
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cropper.scale = 1;
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cropper.angle = 0;
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imgTransform(ins);
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}
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//监听截取框宽高变化
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function canvasWidth(ins) {
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if (!ins) return;
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computeCutSize(ins);
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}
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function canvasHeight(ins) {
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if (!ins) return;
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computeCutSize(ins);
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}
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function updateData(ins) {
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if (!ins) return;
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ins.callMethod('change', {
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cutX: cropper.cutX,
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cutY: cropper.cutY,
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imgWidth: cropper.imgWidth,
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imgHeight: cropper.imgHeight,
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scale: cropper.scale,
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angle: cropper.angle,
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imgTop: cropper.imgTop,
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imgLeft: cropper.imgLeft
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})
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}
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function propsChange(prop, oldProp, ownerInstance, ins) {
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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 = ins.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>设置图片尺寸>绘制canvas
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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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module.exports = {
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touchstart: touchstart,
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touchmove: touchmove,
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touchend: touchend,
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propsChange: propsChange
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}
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