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// #ifndef APP-PLUS || MP-WEIXIN || H5
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export default {
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data() {
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return {
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touchRelative: [{
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x: 0,
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y: 0
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}],
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hypotenuseLength: 0,
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flagEndTouch: false,
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canvasWidth: 0,
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canvasHeight: 0
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}
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},
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created() {
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this.canvasWidth = Number(this.width);
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this.canvasHeight = Number(this.height);
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},
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watch: {
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width(val) {
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this.canvasWidth = Number(val);
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},
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height(val) {
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this.canvasHeight = Number(val);
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},
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changeval(val) {
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this.valsChange(val)
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}
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},
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computed: {
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getTransform: function() {
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return `translate3d(${this.imgLeft - this.imgWidth / 2}px,${this.imgTop - this.imgHeight / 2}px,0) scale(${this.scale}) rotate(${this.angle}deg)`;
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}
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},
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methods: {
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cutDetectionPosition() {
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var windowHeight = this.windowHeight,
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windowWidth = this.windowWidth;
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var cutDetectionPositionTop = () => {
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if (this.cutY < 0) {
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this.cutY = 0;
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}
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if (this.cutY > windowHeight - this.canvasHeight) {
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this.cutY = windowHeight - this.canvasHeight;
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}
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}
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var cutDetectionPositionLeft = () => {
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if (this.cutX < 0) {
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this.cutX = 0;
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}
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if (this.cutX > windowWidth - this.canvasWidth) {
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this.cutX = windowWidth - this.canvasWidth;
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}
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}
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if (this.cutY == null && this.cutX == null) {
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var cutY = (windowHeight - this.canvasHeight) * 0.5;
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var cutX = (windowWidth - this.canvasWidth) * 0.5;
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this.cutY = cutY;
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this.cutX = cutX;
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} else if (this.cutY != null && this.cutX != null) {
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cutDetectionPositionTop();
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cutDetectionPositionLeft();
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} else if (this.cutY != null && this.cutX == null) {
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cutDetectionPositionTop();
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this.cutX = (windowWidth - this.canvasWidth) / 2;
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} else if (this.cutY == null && this.cutX != null) {
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cutDetectionPositionLeft();
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this.cutY = (windowHeight - this.canvasHeight) / 2;
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}
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},
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imgMarginDetectionPosition(scale) {
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var left = this.imgLeft;
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var top = this.imgTop;
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scale = scale || this.scale;
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var imgWidth = this.imgWidth;
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var imgHeight = this.imgHeight;
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if ((this.angle / 90) % 2) {
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imgWidth = this.imgHeight;
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imgHeight = this.imgWidth;
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}
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left = this.cutX + (imgWidth * scale) / 2 >= left ? left : this.cutX + (imgWidth * scale) / 2;
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left = this.cutX + this.canvasWidth - (imgWidth * scale) / 2 <= left ? left : this.cutX + this.canvasWidth -
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(imgWidth * scale) / 2;
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top = this.cutY + (imgHeight * scale) / 2 >= top ? top : this.cutY + (imgHeight * scale) / 2;
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top = this.cutY + this.canvasHeight - (imgHeight * scale) / 2 <= top ? top : this.cutY + this.canvasHeight -
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(imgHeight * scale) / 2;
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this.imgLeft = left;
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this.imgTop = top;
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this.scale = scale;
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},
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imgMarginDetectionScale(scale) {
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scale = scale || this.scale;
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var imgWidth = this.imgWidth;
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var imgHeight = this.imgHeight;
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if ((this.angle / 90) % 2) {
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imgWidth = this.imgHeight;
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imgHeight = this.imgWidth;
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}
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if (imgWidth * scale < this.canvasWidth) {
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scale = this.canvasWidth / imgWidth;
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}
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if (imgHeight * scale < this.canvasHeight) {
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scale = Math.max(scale, this.canvasHeight / imgHeight);
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}
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this.imgMarginDetectionPosition(scale);
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},
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computeCutSize() {
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if (this.canvasWidth > this.windowWidth) {
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this.canvasWidth = this.windowWidth;
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} else if (this.canvasWidth + this.cutX > this.windowWidth) {
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this.cutX = this.windowWidth - this.cutX;
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}
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if (this.canvasHeight > this.windowHeight) {
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this.canvasHeight = this.windowHeight;
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} else if (this.canvasHeight + this.cutY > this.windowHeight) {
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this.cutY = this.windowHeight - this.cutY;
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}
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},
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setCutCenter() {
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var cutY = (this.windowHeight - this.canvasHeight) * 0.5;
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var cutX = (this.windowWidth - this.canvasWidth) * 0.5;
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this.imgTop = this.imgTop - this.cutY + cutY;
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this.cutY = cutY;
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this.imgLeft = this.imgLeft - this.cutX + cutX;
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this.cutX = cutX;
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this.cutDetectionPosition()
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},
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imageReset() {
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this.scale = 1;
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this.angle = 0;
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},
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touchstart(e) {
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var touch = e.touches || e.changedTouches
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this.flagEndTouch = false;
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if (touch.length == 1) {
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this.touchRelative[0] = {
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x: touch[0].clientX - this.imgLeft,
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y: touch[0].clientY - this.imgTop
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};
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} else {
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var width = Math.abs(touch[0].clientX - touch[1].clientX);
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var height = Math.abs(touch[0].clientY - touch[1].clientY);
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this.touchRelative = [{
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x: touch[0].clientX - this.imgLeft,
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y: touch[0].clientY - this.imgTop
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},
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{
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x: touch[1].clientX - this.imgLeft,
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y: touch[1].clientY - this.imgTop
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}
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];
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this.hypotenuseLength = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2));
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}
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},
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touchmove(e) {
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var touch = e.touches || e.changedTouches
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if (this.flagEndTouch) return;
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this.moveDuring();
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if (touch.length == 1) {
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var left = touch[0].clientX - this.touchRelative[0].x,
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top = touch[0].clientY - this.touchRelative[0].y;
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this.imgLeft = left;
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this.imgTop = top;
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this.imgMarginDetectionPosition();
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} else {
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var width = Math.abs(touch[0].clientX - touch[1].clientX),
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height = Math.abs(touch[0].clientY - touch[1].clientY),
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hypotenuse = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)),
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scale = this.scale * (hypotenuse / this.hypotenuseLength),
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current_deg = 0;
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scale = scale <= 0.5 ? 0.5 : scale;
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scale = scale >= 2 ? 2 : scale;
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this.imgMarginDetectionScale(scale);
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var touchRelative = [{
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x: touch[0].clientX - this.imgLeft,
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y: touch[0].clientY - this.imgTop
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},
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{
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x: touch[1].clientX - this.imgLeft,
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y: touch[1].clientY - this.imgTop
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}
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];
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this.touchRelative = touchRelative;
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this.hypotenuseLength = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2));
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this.angle = this.angle + current_deg;
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this.scale = this.scale;
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}
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},
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touchend(e) {
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this.flagEndTouch = true;
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this.moveStop();
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},
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valsChange(val) {
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if (val) {
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var params = val.split('_')
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var type = Number(params[0])
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switch (type) {
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case 1:
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this.setCutCenter();
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this.computeCutSize();
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this.cutDetectionPosition();
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break;
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case 2:
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this.setCutCenter();
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break;
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case 3:
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this.imgMarginDetectionScale()
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break;
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case 4:
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this.imageReset();
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break;
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case 5:
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this.setCutCenter();
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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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}
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}
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// #endif
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// #ifdef APP-PLUS|| MP-WEIXIN || H5
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export default {}
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// #endif
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