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+/**
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+ * 图片编辑器-手势监听
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+ * 1. 支持编译到app-vue(uni-app 2.5.5及以上版本)、H5上
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+ */
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+/** 图片偏移量 */
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+var offset = { x: 0, y: 0 };
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+/** 图片缩放比例 */
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+var scale = 1;
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+/** 图片最小缩放比例 */
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+var minScale = 1;
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+/** 图片旋转角度 */
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+var rotate = 0;
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+/** 触摸点 */
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+var touches = [];
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+/** 图片布局信息 */
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+var img = {};
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+/** 系统信息 */
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+var sys = {};
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+/** 裁剪区域布局信息 */
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+var area = {};
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+/** 触摸行为类型 */
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+var touchType = '';
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+/** 操作角的位置 */
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+var activeAngle = 0;
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+/** 裁剪区域布局信息偏移量 */
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+var areaOffset = { left: 0, right: 0, top: 0, bottom: 0 };
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+/** 元素ID */
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+var elIds = {
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+ 'imageStyles': 'crop-image',
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+ 'maskStylesList': 'crop-mask-block',
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+ 'borderStyles': 'crop-border',
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+ 'circleBoxStyles': 'crop-circle-box',
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+ 'circleStyles': 'crop-circle',
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+ 'gridStylesList': 'crop-grid',
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+ 'angleStylesList': 'crop-angle',
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+}
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+/** 记录上次初始化时间戳,排除APP重复更新 */
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+var timestamp = 0;
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+/**
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+ * 样式对象转字符串
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+ * @param {Object} style 样式对象
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+ */
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+function styleToString(style) {
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+ if(typeof style === 'string') return style;
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+ var str = '';
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+ for (let k in style) {
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+ str += k + ':' + style[k] + ';';
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+ }
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+ return str;
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+}
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+/**
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+ *
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+ * @param {Object} instance 页面实例对象
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+ * @param {Object} key 要修改样式的key
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+ * @param {Object|Array} style 样式
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+ */
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+function setStyle(instance, key, style) {
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+ // console.log('setStyle', instance, key, JSON.stringify(style))
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+ // #ifdef APP-PLUS
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+ if(Object.prototype.toString.call(style) === '[object Array]') {
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+ for (var i = 0, len = style.length; i < len; i++) {
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+ var el = window.document.getElementById(elIds[key] + '-' + (i + 1));
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+ el && (el.style = styleToString(style[i]));
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+ }
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+ } else {
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+ var el = window.document.getElementById(elIds[key]);
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+ el && (el.style = styleToString(style));
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+ }
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+ // #endif
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+ // #ifdef H5
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+ instance[key] = style;
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+ // #endif
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+}
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+/**
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+ * 触发页面实例指定方法
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+ * @param {Object} instance 页面实例对象
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+ * @param {Object} name 方法名称
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+ * @param {Object} obj 传递参数
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+ */
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+function callMethod(instance, name, obj) {
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+ // #ifdef APP-PLUS
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+ instance.callMethod(name, obj);
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+ // #endif
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+ // #ifdef H5
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+ instance[name](obj);
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+ // #endif
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+}
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+/**
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+ * 计算两点间距
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+ * @param {Object} touches 触摸点信息
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+ */
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+function getDistanceByTouches(touches) {
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+ // 根据勾股定理求两点间距离
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+ var a = touches[1].pageX - touches[0].pageX;
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+ var b = touches[1].pageY - touches[0].pageY;
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+ var c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
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+ // 求两点间的中点坐标
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+ // 1. a、b可能为负值
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+ // 2. 在求a、b时,如用touches[1]减touches[0],则求中点坐标也得用touches[1]减a/2、b/2
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+ // 3. 同理,在求a、b时,也可用touches[0]减touches[1],则求中点坐标也得用touches[0]减a/2、b/2
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+ var x = touches[1].pageX - a / 2;
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+ var y = touches[1].pageY - b / 2;
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+ return { c, x, y };
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+};
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+/**
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+ * 检查边界:限制 x、y 拖动范围,禁止滑出边界
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+ * @param {Object} e 点坐标
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+ */
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+function checkRange(e) {
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+ var r = rotate / 90 % 2;
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+ if(r === 1) { // 因图片宽高可能不等,翻转 90° 或 270° 后图片宽高需反着计算,且左右和上下边界要根据差值做偏移
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+ var o = (img.height - img.width) / 2; // 宽高差值一半
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+ return {
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+ x: Math.min(Math.max(e.x, -img.height + o + area.width + area.left), area.left + o),
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+ y: Math.min(Math.max(e.y, -img.width - o + area.height + area.top), area.top - o)
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+ }
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+ }
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+ return {
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+ x: Math.min(Math.max(e.x, -img.width + area.width + area.left), area.left),
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+ y: Math.min(Math.max(e.y, -img.height + area.height + area.top), area.top)
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+ }
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+};
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+/**
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+ * 变更图片布局信息
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+ * @param {Object} e 布局信息
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+ */
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+function changeImageRect(e) {
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+ // console.log('changeImageRect', e)
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+ offset.x += e.x || 0;
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+ offset.y += e.y || 0;
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+ if(e.check) { // 检查边界
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+ var point = checkRange(offset);
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+ if(offset.x !== point.x || offset.y !== point.y) {
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+ offset = point;
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+ }
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+ }
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+
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+ // 因频繁修改 width/height 会造成大量的内存消耗,改为scale
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+ // e.instance.imageStyles = {
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+ // width: img.width + 'px',
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+ // height: img.height + 'px',
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+ // transform: 'translate(' + (offset.x + ox) + 'px, ' + (offset.y + ox) + 'px) rotate(' + rotate +'deg)'
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+ // };
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+ var ox = (img.width - img.oldWidth) / 2;
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+ var oy = (img.height - img.oldHeight) / 2;
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+ // e.instance.imageStyles = {
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+ // width: img.oldWidth + 'px',
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+ // height: img.oldHeight + 'px',
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+ // transform: 'translate(' + (offset.x + ox) + 'px, ' + (offset.y + oy) + 'px) rotate(' + rotate +'deg) scale(' + scale + ')'
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+ // };
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+ setStyle(e.instance, 'imageStyles', {
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+ width: img.oldWidth + 'px',
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+ height: img.oldHeight + 'px',
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+ transform: 'translate(' + (offset.x + ox) + 'px, ' + (offset.y + oy) + 'px) rotate(' + rotate +'deg) scale(' + scale + ')'
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+ });
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+ callMethod(e.instance, 'dataChange', {
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+ width: img.width,
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+ height: img.height,
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+ x: offset.x,
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+ y: offset.y,
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+ rotate: rotate
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+ });
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+};
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+/**
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+ * 变更裁剪区域布局信息
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+ * @param {Object} e 布局信息
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+ */
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+function changeAreaRect(e) {
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+ // console.log('changeAreaRect', e)
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+ // 变更蒙版样式
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+ setStyle(e.instance, 'maskStylesList', [
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+ {
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+ left: 0,
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+ width: (area.left + areaOffset.left) + 'px',
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+ top: 0,
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+ bottom: 0,
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+ },
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+ {
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+ left: (area.right + areaOffset.right) + 'px',
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+ right: 0,
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+ top: 0,
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+ bottom: 0,
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+ },
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+ {
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+ left: (area.left + areaOffset.left) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px',
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+ top: 0,
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+ height: (area.top + areaOffset.top) + 'px',
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+ },
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+ {
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+ left: (area.left + areaOffset.left) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px',
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+ top: (area.bottom + areaOffset.bottom) + 'px',
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+ // height: (area.top - areaOffset.bottom + sys.offsetBottom) + 'px',
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+ bottom: 0,
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+ }
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+ ]);
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+ // 变更边框样式
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+ if(area.showBorder) {
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+ setStyle(e.instance, 'borderStyles', {
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+ left: (area.left + areaOffset.left) + 'px',
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+ top: (area.top + areaOffset.top) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px',
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+ height: (area.height + areaOffset.bottom - areaOffset.top) + 'px',
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+ });
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+ }
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+
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+ // 变更参考线样式
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+ if(area.showGrid) {
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+ setStyle(e.instance, 'gridStylesList', [
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+ {
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+ 'border-width': '1px 0 0 0',
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+ left: (area.left + areaOffset.left) + 'px',
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+ right: (area.right + areaOffset.right) + 'px',
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+ top: (area.top + areaOffset.top + (area.height + areaOffset.bottom - areaOffset.top) / 3 - 0.5) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px'
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+ },
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+ {
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+ 'border-width': '1px 0 0 0',
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+ left: (area.left + areaOffset.left) + 'px',
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+ right: (area.right + areaOffset.right) + 'px',
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+ top: (area.top + areaOffset.top + (area.height + areaOffset.bottom - areaOffset.top) * 2 / 3 - 0.5) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px'
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+ },
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+ {
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+ 'border-width': '0 1px 0 0',
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+ top: (area.top + areaOffset.top) + 'px',
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+ bottom: (area.bottom + areaOffset.bottom) + 'px',
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+ left: (area.left + areaOffset.left + (area.width + areaOffset.right - areaOffset.left) / 3 - 0.5) + 'px',
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+ height: (area.height + areaOffset.bottom - areaOffset.top) + 'px'
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+ },
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+ {
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+ 'border-width': '0 1px 0 0',
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+ top: (area.top + areaOffset.top) + 'px',
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+ bottom: (area.bottom + areaOffset.bottom) + 'px',
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+ left: (area.left + areaOffset.left + (area.width + areaOffset.right - areaOffset.left) * 2 / 3 - 0.5) + 'px',
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+ height: (area.height + areaOffset.bottom - areaOffset.top) + 'px'
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+ }
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+ ]);
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+ }
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+
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+ // 变更四个伸缩角样式
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+ if(area.showAngle) {
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+ setStyle(e.instance, 'angleStylesList', [
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+ {
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+ 'border-width': area.angleBorderWidth + 'px 0 0 ' + area.angleBorderWidth + 'px',
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+ left: (area.left + areaOffset.left - area.angleBorderWidth) + 'px',
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+ top: (area.top + areaOffset.top - area.angleBorderWidth) + 'px',
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+ },
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+ {
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+ 'border-width': area.angleBorderWidth + 'px ' + area.angleBorderWidth + 'px 0 0',
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+ left: (area.right + areaOffset.right - area.angleSize) + 'px',
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+ top: (area.top + areaOffset.top - area.angleBorderWidth) + 'px',
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+ },
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+ {
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+ 'border-width': '0 0 ' + area.angleBorderWidth + 'px ' + area.angleBorderWidth + 'px',
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+ left: (area.left + areaOffset.left - area.angleBorderWidth) + 'px',
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+ top: (area.bottom + areaOffset.bottom - area.angleSize) + 'px',
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+ },
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+ {
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+ 'border-width': '0 ' + area.angleBorderWidth + 'px ' + area.angleBorderWidth + 'px 0',
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+ left: (area.right + areaOffset.right - area.angleSize) + 'px',
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+ top: (area.bottom + areaOffset.bottom - area.angleSize) + 'px',
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+ }
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+ ]);
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+ }
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+
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+ // 变更圆角样式
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+ if(area.radius > 0) {
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+ var radius = area.radius;
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+ if(area.width === area.height && area.radius >= area.width / 2) { // 圆形
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+ radius = (area.width / 2);
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+ } else { // 圆角矩形
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+ if(area.width !== area.height) { // 限制圆角半径不能超过短边的一半
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+ radius = Math.min(area.width / 2, area.height / 2, radius);
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+ }
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+ }
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+ setStyle(e.instance, 'circleBoxStyles', {
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+ left: (area.left + areaOffset.left) + 'px',
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+ top: (area.top + areaOffset.top) + 'px',
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+ width: (area.width + areaOffset.right - areaOffset.left) + 'px',
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+ height: (area.height + areaOffset.bottom - areaOffset.top) + 'px'
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+ });
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+ setStyle(e.instance, 'circleStyles', {
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+ 'box-shadow': '0 0 0 ' + Math.max(area.width, area.height) + 'px rgba(51, 51, 51, 0.8)',
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+ 'border-radius': radius + 'px'
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+ });
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+ }
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+};
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+/**
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+ * 缩放图片
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+ * @param {Object} e 布局信息
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+ */
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+function scaleImage(e) {
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+ // console.log('scaleImage', e)
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+ var last = scale;
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+ scale = Math.min(Math.max(e.scale + scale, minScale), img.maxScale);
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+ if(last !== scale) {
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+ img.width = img.oldWidth * scale;
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+ img.height = img.oldHeight * scale;
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+ // 参考问题:有一个长4000px、宽4000px的四方形ABCD,A点的坐标固定在(-2000,-2000),
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+ // 该四边形上有一个点E,坐标为(-100,-300),将该四方形复制一份并缩小到90%后,
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+ // 新四边形的A点坐标为多少时可使新四边形的E点与原四边形的E点重合?
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+ // 预期效果:从图中选取某点(参照物)为中心点进行缩放,缩放时无论图像怎么变化,该点位置始终固定不变
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+ // 计算方法:以相同起点先计算缩放前后两点间的距离,再加上原图像偏移量即可
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+ e.x = (e.x - offset.x) * (1 - scale / last);
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+ e.y = (e.y - offset.y) * (1 - scale / last);
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+ changeImageRect(e);
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+ return true;
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+ }
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+ return false;
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+};
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+/**
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+ * 获取触摸点在哪个角
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+ * @param {number} x 触摸点x轴坐标
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+ * @param {number} y 触摸点y轴坐标
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+ * @return {number} 角的位置:0=无;1=左上;2=右上;3=左下;4=右下;
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+ */
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+function getToucheAngle(x, y) {
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+ // console.log('getToucheAngle', x, y, JSON.stringify(area))
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+ var o = area.angleBorderWidth; // 需扩大触发范围则把 o 值加大即可
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+ var oy = sys.navigation ? 0 : sys.windowTop;
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+ if(y >= area.top - o + oy && y <= area.top + area.angleSize + o + oy) {
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+ if(x >= area.left - o && x <= area.left + area.angleSize + o) {
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+ return 1; // 左上角
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+ } else if(x >= area.right - area.angleSize - o && x <= area.right + o) {
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+ return 2; // 右上角
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+ }
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+ } else if(y >= area.bottom - area.angleSize - o + oy && y <= area.bottom + o + oy) {
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+ if(x >= area.left - o && x <= area.left + area.angleSize + o) {
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+ return 3; // 左下角
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+ } else if(x >= area.right - area.angleSize - o && x <= area.right + o) {
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+ return 4; // 右下角
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+ }
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+ }
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+ return 0; // 无触摸到角
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+};
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+/**
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+ * 重置数据
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|
+ */
|
|
|
+function resetData() {
|
|
|
+ offset = { x: 0, y: 0 };
|
|
|
+ scale = 1;
|
|
|
+ minScale = 1;
|
|
|
+ rotate = 0;
|
|
|
+};
|
|
|
+function getTouchs(touches) {
|
|
|
+ var result = [];
|
|
|
+ var len = touches ? touches.length : 0
|
|
|
+ for (var i = 0; i < len; i++) {
|
|
|
+ result[i] = {
|
|
|
+ pageX: touches[i].pageX,
|
|
|
+ // h5无标题栏时,窗口顶部距离仍为标题栏高度,且触摸点y轴坐标还是有标题栏的值,即减去标题栏高度的值
|
|
|
+ pageY: touches[i].pageY + sys.windowTop
|
|
|
+ };
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+};
|
|
|
+export default {
|
|
|
+ data() {
|
|
|
+ return {
|
|
|
+ imageStyles: {},
|
|
|
+ maskStylesList: [{}, {}, {}, {}],
|
|
|
+ borderStyles: {},
|
|
|
+ gridStylesList: [{}, {}, {}, {}],
|
|
|
+ angleStylesList: [{}, {}, {}, {}],
|
|
|
+ circleBoxStyles: {},
|
|
|
+ circleStyles: {}
|
|
|
+ }
|
|
|
+ },
|
|
|
+ created() {
|
|
|
+ // 监听 PC 端鼠标滚轮
|
|
|
+ // #ifdef H5
|
|
|
+ window.addEventListener('mousewheel', (e) => {
|
|
|
+ var touchs = getTouchs([e])
|
|
|
+ img.src && scaleImage({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ check: true,
|
|
|
+ // 鼠标向上滚动时,deltaY 固定 -100,鼠标向下滚动时,deltaY 固定 100
|
|
|
+ scale: e.deltaY > 0 ? -0.05 : 0.05,
|
|
|
+ x: touchs[0].pageX,
|
|
|
+ y: touchs[0].pageY
|
|
|
+ });
|
|
|
+ });
|
|
|
+ // #endif
|
|
|
+ },
|
|
|
+ methods: {
|
|
|
+ getInstance() {
|
|
|
+ // #ifdef APP-PLUS
|
|
|
+ return this.$ownerInstance;
|
|
|
+ // #endif
|
|
|
+ // #ifdef H5
|
|
|
+ return this;
|
|
|
+ // #endif
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 初始化:观察数据变更
|
|
|
+ * @param {Object} newVal 新数据
|
|
|
+ * @param {Object} oldVal 旧数据
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ initObserver: function(newVal, oldVal, o, i) {
|
|
|
+ console.log('initObserver', newVal, oldVal, o, i)
|
|
|
+ if(newVal && (!img.src || timestamp !== newVal.timestamp)) {
|
|
|
+ timestamp = newVal.timestamp;
|
|
|
+ img = newVal.img;
|
|
|
+ sys = newVal.sys;
|
|
|
+ area = newVal.area;
|
|
|
+ resetData();
|
|
|
+ img.src && changeImageRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ x: (sys.windowWidth - img.width) / 2,
|
|
|
+ y: (sys.windowHeight + sys.windowTop - sys.offsetBottom - img.height) / 2
|
|
|
+ });
|
|
|
+ changeAreaRect({
|
|
|
+ instance: this.getInstance()
|
|
|
+ });
|
|
|
+ }
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 鼠标滚轮滚动
|
|
|
+ * @param {Object} e 事件对象
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ mousewheel: function(e, o) {
|
|
|
+ // h5平台 wheel 事件无法判断滚轮滑动方向,需使用 mousewheel
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 触摸开始
|
|
|
+ * @param {Object} e 事件对象
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ touchstart: function(e, o) {
|
|
|
+ if(!img.src) return;
|
|
|
+ touches = getTouchs(e.touches);
|
|
|
+ activeAngle = area.showAngle ? getToucheAngle(touches[0].pageX, touches[0].pageY) : 0;
|
|
|
+ if(touches.length === 1 && activeAngle !== 0) {
|
|
|
+ touchType = 'stretch'; // 伸缩裁剪区域
|
|
|
+ } else {
|
|
|
+ touchType = '';
|
|
|
+ }
|
|
|
+ // console.log('touchstart', e, activeAngle)
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 触摸移动
|
|
|
+ * @param {Object} e 事件对象
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ touchmove: function(e, o) {
|
|
|
+ if(!img.src) return;
|
|
|
+ // console.log('touchmove', e, o)
|
|
|
+ e.touches = getTouchs(e.touches);
|
|
|
+ if(touchType === 'stretch') { // 触摸四个角进行拉伸
|
|
|
+ var point = e.touches[0];
|
|
|
+ var start = touches[0];
|
|
|
+ var x = point.pageX - start.pageX;
|
|
|
+ var y = point.pageY - start.pageY;
|
|
|
+ if(x !== 0 || y !== 0) {
|
|
|
+ var maxX = area.width * (1 - area.minScale);
|
|
|
+ var maxY = area.height * (1 - area.minScale);
|
|
|
+ // console.log(x, y, maxX, maxY)
|
|
|
+ touches[0] = point;
|
|
|
+ switch(activeAngle) {
|
|
|
+ case 1: // 左上角
|
|
|
+ x += areaOffset.left;
|
|
|
+ y += areaOffset.top;
|
|
|
+ if(x >= 0 && y >= 0) { // 有效滑动
|
|
|
+ if(x > y) { // 以x轴滑动距离为缩放基准
|
|
|
+ if(x > maxX) x = maxX;
|
|
|
+ y = x * area.height / area.width;
|
|
|
+ } else { // 以y轴滑动距离为缩放基准
|
|
|
+ if(y > maxY) y = maxY;
|
|
|
+ x = y * area.width / area.height;
|
|
|
+ }
|
|
|
+ areaOffset.left = x;
|
|
|
+ areaOffset.top = y;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 2: // 右上角
|
|
|
+ x += areaOffset.right;
|
|
|
+ y += areaOffset.top;
|
|
|
+ if(x <= 0 && y >= 0) { // 有效滑动
|
|
|
+ if(-x > y) { // 以x轴滑动距离为缩放基准
|
|
|
+ if(-x > maxX) x = -maxX;
|
|
|
+ y = -x * area.height / area.width;
|
|
|
+ } else { // 以y轴滑动距离为缩放基准
|
|
|
+ if(y > maxY) y = maxY;
|
|
|
+ x = -y * area.width / area.height;
|
|
|
+ }
|
|
|
+ areaOffset.right = x;
|
|
|
+ areaOffset.top = y;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 3: // 左下角
|
|
|
+ x += areaOffset.left;
|
|
|
+ y += areaOffset.bottom;
|
|
|
+ if(x >= 0 && y <= 0) { // 有效滑动
|
|
|
+ if(x > -y) { // 以x轴滑动距离为缩放基准
|
|
|
+ if(x > maxX) x = maxX;
|
|
|
+ y = -x * area.height / area.width;
|
|
|
+ } else { // 以y轴滑动距离为缩放基准
|
|
|
+ if(-y > maxY) y = -maxY;
|
|
|
+ x = -y * area.width / area.height;
|
|
|
+ }
|
|
|
+ areaOffset.left = x;
|
|
|
+ areaOffset.bottom = y;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 4: // 右下角
|
|
|
+ x += areaOffset.right;
|
|
|
+ y += areaOffset.bottom;
|
|
|
+ if(x <= 0 && y <= 0) { // 有效滑动
|
|
|
+ if(-x > -y) { // 以x轴滑动距离为缩放基准
|
|
|
+ if(-x > maxX) x = -maxX;
|
|
|
+ y = x * area.height / area.width;
|
|
|
+ } else { // 以y轴滑动距离为缩放基准
|
|
|
+ if(-y > maxY) y = -maxY;
|
|
|
+ x = y * area.width / area.height;
|
|
|
+ }
|
|
|
+ areaOffset.right = x;
|
|
|
+ areaOffset.bottom = y;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ // console.log(x, y, JSON.stringify(areaOffset))
|
|
|
+ changeAreaRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ });
|
|
|
+ // this.draw();
|
|
|
+ }
|
|
|
+ } else if (e.touches.length == 2) { // 双点触摸缩放
|
|
|
+ var start = getDistanceByTouches(touches);
|
|
|
+ var end = getDistanceByTouches(e.touches);
|
|
|
+ scaleImage({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ check: !area.bounce,
|
|
|
+ scale: (end.c - start.c) / 100,
|
|
|
+ x: end.x,
|
|
|
+ y: end.y
|
|
|
+ });
|
|
|
+ touchType = 'scale';
|
|
|
+ } else if(touchType === 'scale') {// 从双点触摸变成单点触摸 / 从缩放变成拖动
|
|
|
+ touchType = 'move';
|
|
|
+ } else {
|
|
|
+ changeImageRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ check: !area.bounce,
|
|
|
+ x: e.touches[0].pageX - touches[0].pageX,
|
|
|
+ y: e.touches[0].pageY - touches[0].pageY
|
|
|
+ });
|
|
|
+ touchType = 'move';
|
|
|
+ }
|
|
|
+ touches = e.touches;
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 触摸结束
|
|
|
+ * @param {Object} e 事件对象
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ touchend: function(e, o) {
|
|
|
+ if(!img.src) return;
|
|
|
+ if(touchType === 'stretch') { // 拉伸裁剪区域的四个角缩放
|
|
|
+ // 裁剪区域宽度被缩放到多少
|
|
|
+ var left = areaOffset.left;
|
|
|
+ var right = areaOffset.right;
|
|
|
+ var top = areaOffset.top;
|
|
|
+ var bottom = areaOffset.bottom;
|
|
|
+ var w = area.width + right - left;
|
|
|
+ var h = area.height + bottom - top;
|
|
|
+ // 图像放大倍数
|
|
|
+ var p = scale * (area.width / w) - scale;
|
|
|
+ // 复原裁剪区域
|
|
|
+ areaOffset = { left: 0, right: 0, top: 0, bottom: 0 };
|
|
|
+ changeAreaRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ });
|
|
|
+ scaleImage({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ scale: p,
|
|
|
+ x: area.left + left + (1 === activeAngle || 3 === activeAngle ? w : 0),
|
|
|
+ y: area.top + top + (1 === activeAngle || 2 === activeAngle ? h : 0)
|
|
|
+ });
|
|
|
+ } else if (area.bounce) { // 检查边界并矫正,实现拖动到边界时有回弹效果
|
|
|
+ changeImageRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ check: true
|
|
|
+ });
|
|
|
+ }
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * 顺时针翻转图片90°
|
|
|
+ * @param {Object} e 事件对象
|
|
|
+ * @param {Object} o 组件实例对象
|
|
|
+ */
|
|
|
+ rotateImage: function(e, o) {
|
|
|
+ rotate = (rotate + 90) % 360;
|
|
|
+
|
|
|
+ // 因图片宽高可能不等,翻转后图片宽高需足够填满裁剪区域
|
|
|
+ var r = rotate / 90 % 2;
|
|
|
+ minScale = 1;
|
|
|
+ if(img.width < area.height) {
|
|
|
+ minScale = area.height / img.oldWidth;
|
|
|
+ } else if(img.height < area.width) {
|
|
|
+ minScale = (area.width / img.oldHeight)
|
|
|
+ }
|
|
|
+ if(minScale !== 1) {
|
|
|
+ scaleImage({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ scale: minScale - scale,
|
|
|
+ x: sys.windowWidth / 2,
|
|
|
+ y: (sys.windowHeight - sys.offsetBottom) / 2
|
|
|
+ });
|
|
|
+ }
|
|
|
+
|
|
|
+ // 由于拖动画布后会导致图片位置偏移,翻转时的旋转中心点需是图片区域+偏移区域的中心点
|
|
|
+ // 翻转x轴中心点 = (超出裁剪区域右侧的图片宽度 - 超出裁剪区域左侧的图片宽度) / 2
|
|
|
+ // 翻转y轴中心点 = (超出裁剪区域下方的图片宽度 - 超出裁剪区域上方的图片宽度) / 2
|
|
|
+ var ox = ((offset.x + img.width - area.right) - (area.left - offset.x)) / 2;
|
|
|
+ var oy = ((offset.y + img.height - area.bottom) - (area.top - offset.y)) / 2;
|
|
|
+ changeImageRect({
|
|
|
+ instance: this.getInstance(),
|
|
|
+ check: true,
|
|
|
+ x: -ox - oy,
|
|
|
+ y: -oy + ox
|
|
|
+ });
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|