1117 lines
47 KiB
JavaScript
Executable File
1117 lines
47 KiB
JavaScript
Executable File
Component({
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properties: {
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/**
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* 图片路径
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*/
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'imgSrc': {
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type: String
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},
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/**
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* 裁剪框高度
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*/
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'height': {
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type: Number,
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value: 200
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},
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/**
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* 裁剪框宽度
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*/
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'width': {
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type: Number,
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value: 200
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},
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/**
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* 裁剪框最小尺寸
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*/
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'min_width': {
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type: Number,
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value: 100
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},
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'min_height': {
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type: Number,
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value: 100
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},
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/**
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* 裁剪框最大尺寸
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*/
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'max_width': {
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type: Number,
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value: 300
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},
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'max_height': {
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type: Number,
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value: 300
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},
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/**
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* 裁剪框禁止拖动
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*/
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'disable_width': {
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type: Boolean,
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value: false
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},
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'disable_height': {
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type: Boolean,
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value: false
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},
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/**
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* 锁定裁剪框比例
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*/
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'disable_ratio': {
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type: Boolean,
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value: false
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},
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/**
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* 生成的图片尺寸相对剪裁框的比例
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*/
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'export_scale': {
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type: Number,
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value: 3
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},
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/**
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* 生成的图片质量0-1
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*/
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'quality': {
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type: Number,
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value: 1
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},
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'cut_top': {
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type: Number,
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value: null
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},
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'cut_left': {
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type: Number,
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value: null
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},
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/**
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* canvas上边距（不设置默认不显示）
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*/
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'canvas_top': {
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type: Number,
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value: null
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},
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/**
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* canvas左边距（不设置默认不显示）
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*/
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'canvas_left': {
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type: Number,
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value: null
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},
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/**
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* 图片宽度
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*/
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'img_width': {
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type: null,
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value: null
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},
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/**
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* 图片高度
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*/
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'img_height': {
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type: null,
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value: null
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},
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/**
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* 图片缩放比
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*/
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'scale': {
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type: Number,
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value: 1
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},
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/**
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* 图片旋转角度
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*/
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'angle': {
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type: Number,
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value: 0
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},
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/**
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* 最小缩放比
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*/
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'min_scale': {
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type: Number,
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value: 0.5
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},
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/**
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* 最大缩放比
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*/
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'max_scale': {
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type: Number,
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value: 2
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},
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/**
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* 是否禁用旋转
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*/
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'disable_rotate': {
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type: Boolean,
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value: false
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},
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/**
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* 是否限制移动范围(剪裁框只能在图片内)
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*/
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'limit_move': {
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type: Boolean,
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value: false
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}
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},
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data: {
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el: 'image-cropper', //暂时无用
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info: wx.getSystemInfoSync(),
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MOVE_THROTTLE: null, //触摸移动节流settimeout
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MOVE_THROTTLE_FLAG: true, //节流标识
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INIT_IMGWIDTH: 0, //图片设置尺寸,此值不变（记录最初设定的尺寸）
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INIT_IMGHEIGHT: 0, //图片设置尺寸,此值不变（记录最初设定的尺寸）
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TIME_BG: null, //背景变暗延时函数
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TIME_CUT_CENTER: null,
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_touch_img_relative: [{
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x: 0,
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y: 0
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}], //鼠标和图片中心的相对位置
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_flag_cut_touch: false, //是否是拖动裁剪框
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_hypotenuse_length: 0, //双指触摸时斜边长度
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_flag_img_endtouch: false, //是否结束触摸
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_flag_bright: true, //背景是否亮
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_canvas_overflow: true, //canvas缩略图是否在屏幕外面
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_canvas_width: 200,
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_canvas_height: 200,
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origin_x: 0.5, //图片旋转中心
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origin_y: 0.5, //图片旋转中心
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_cut_animation: false, //是否开启图片和裁剪框过渡
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_img_top: wx.getSystemInfoSync().windowHeight / 2, //图片上边距
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_img_left: wx.getSystemInfoSync().windowWidth / 2, //图片左边距
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watch: {
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//监听截取框宽高变化
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width(value, that) {
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if (value < that.data.min_width) {
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that.setData({
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width: that.data.min_width
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});
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}
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that._computeCutSize();
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},
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height(value, that) {
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if (value < that.data.min_height) {
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that.setData({
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height: that.data.min_height
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});
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}
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that._computeCutSize();
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},
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angle(value, that) {
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//停止居中裁剪框，继续修改图片位置
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that._moveStop();
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if (that.data.limit_move) {
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if (that.data.angle % 90) {
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that.setData({
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angle: Math.round(that.data.angle / 90) * 90
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});
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return;
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}
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}
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},
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_cut_animation(value, that) {
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//开启过渡300毫秒之后自动关闭
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clearTimeout(that.data._cut_animation_time);
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if (value) {
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that.data._cut_animation_time = setTimeout(() => {
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that.setData({
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_cut_animation: false
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});
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}, 300)
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}
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},
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limit_move(value, that) {
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if (value) {
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if (that.data.angle % 90) {
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that.setData({
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angle: Math.round(that.data.angle / 90) * 90
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});
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}
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that._imgMarginDetectionScale();
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!that.data._canvas_overflow && that._draw();
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}
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},
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canvas_top(value, that) {
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that._canvasDetectionPosition();
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},
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canvas_left(value, that) {
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that._canvasDetectionPosition();
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},
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imgSrc(value, that) {
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that.pushImg();
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},
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cut_top(value, that) {
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that._cutDetectionPosition();
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if (that.data.limit_move) {
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!that.data._canvas_overflow && that._draw();
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}
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},
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cut_left(value, that) {
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that._cutDetectionPosition();
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if (that.data.limit_move) {
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!that.data._canvas_overflow && that._draw();
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}
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}
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}
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},
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attached() {
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this.data.info = wx.getSystemInfoSync();
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//启用数据监听
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this._watcher();
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this.data.INIT_IMGWIDTH = this.data.img_width;
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this.data.INIT_IMGHEIGHT = this.data.img_height;
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this.setData({
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_canvas_height: this.data.height,
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_canvas_width: this.data.width,
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});
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this._initCanvas();
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this.data.imgSrc && (this.data.imgSrc = this.data.imgSrc);
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//根据开发者设置的图片目标尺寸计算实际尺寸
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this._initImageSize();
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//设置裁剪框大小>设置图片尺寸>绘制canvas
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this._computeCutSize();
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//检查裁剪框是否在范围内
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this._cutDetectionPosition();
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//检查canvas是否在范围内
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this._canvasDetectionPosition();
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//初始化完成
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this.triggerEvent('load', {
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cropper: this
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});
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},
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methods: {
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/**
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* 上传图片
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*/
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upload() {
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let that = this;
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wx.chooseImage({
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count: 1,
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sizeType: ['original', 'compressed'],
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sourceType: ['album', 'camera'],
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success(res) {
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const tempFilePaths = res.tempFilePaths[0];
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that.pushImg(tempFilePaths);
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wx.showLoading({
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title: '加载中...'
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})
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}
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})
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},
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/**
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* 返回图片信息
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*/
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getImg(getCallback) {
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this._draw(() => {
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wx.canvasToTempFilePath({
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width: this.data.width * this.data.export_scale,
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height: Math.round(this.data.height * this.data.export_scale),
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destWidth: this.data.width * this.data.export_scale,
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destHeight: Math.round(this.data.height) * this.data.export_scale,
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fileType: 'png',
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quality: this.data.quality,
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canvasId: this.data.el,
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success: (res) => {
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getCallback({
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url: res.tempFilePath,
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width: this.data.width * this.data.export_scale,
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height: this.data.height * this.data.export_scale
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});
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}
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}, this)
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});
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},
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/**
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* 设置图片动画
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* {
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* x:10,//图片在原有基础上向下移动10px
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* y:10,//图片在原有基础上向右移动10px
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* angle:10,//图片在原有基础上旋转10deg
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* scale:0.5,//图片在原有基础上增加0.5倍
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* }
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*/
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setTransform(transform) {
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if (!transform) return;
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if (!this.data.disable_rotate) {
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this.setData({
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angle: transform.angle ? this.data.angle + transform.angle : this.data.angle
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});
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}
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var scale = this.data.scale;
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if (transform.scale) {
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scale = this.data.scale + transform.scale;
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scale = scale <= this.data.min_scale ? this.data.min_scale : scale;
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scale = scale >= this.data.max_scale ? this.data.max_scale : scale;
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}
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this.data.scale = scale;
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let cutX = this.data.cut_left;
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let cutY = this.data.cut_top;
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if (transform.cutX) {
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this.setData({
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cut_left: cutX + transform.cutX
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});
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this.data.watch.cut_left(null, this);
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}
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if (transform.cutY) {
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this.setData({
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cut_top: cutY + transform.cutY
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});
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this.data.watch.cut_top(null, this);
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}
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this.data._img_top = transform.y ? this.data._img_top + transform.y : this.data._img_top;
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this.data._img_left = transform.x ? this.data._img_left + transform.x : this.data._img_left;
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//图像边缘检测,防止截取到空白
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this._imgMarginDetectionScale();
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//停止居中裁剪框，继续修改图片位置
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this._moveDuring();
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this.setData({
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scale: this.data.scale,
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_img_top: this.data._img_top,
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_img_left: this.data._img_left
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});
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!this.data._canvas_overflow && this._draw();
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//可以居中裁剪框了
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this._moveStop(); //结束操作
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},
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/**
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* 设置剪裁框位置
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*/
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setCutXY(x, y) {
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this.setData({
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cut_top: y,
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cut_left: x
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});
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},
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/**
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* 设置剪裁框尺寸
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*/
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setCutSize(w, h) {
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this.setData({
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width: w,
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height: h
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});
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this._computeCutSize();
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},
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/**
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* 设置剪裁框和图片居中
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*/
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setCutCenter() {
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let cut_top = (this.data.info.windowHeight - this.data.height) * 0.5;
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let cut_left = (this.data.info.windowWidth - this.data.width) * 0.5;
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//顺序不能变
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this.setData({
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_img_top: this.data._img_top - this.data.cut_top + cut_top,
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cut_top: cut_top, //截取的框上边距
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_img_left: this.data._img_left - this.data.cut_left + cut_left,
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cut_left: cut_left, //截取的框左边距
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});
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},
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_setCutCenter() {
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let cut_top = (this.data.info.windowHeight - this.data.height) * 0.5;
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let cut_left = (this.data.info.windowWidth - this.data.width) * 0.5;
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this.setData({
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cut_top: cut_top, //截取的框上边距
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cut_left: cut_left, //截取的框左边距
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});
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},
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/**
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* 设置剪裁框宽度-即将废弃
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*/
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setWidth(width) {
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this.setData({
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width: width
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});
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this._computeCutSize();
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},
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/**
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* 设置剪裁框高度-即将废弃
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*/
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setHeight(height) {
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this.setData({
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height: height
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});
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this._computeCutSize();
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},
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/**
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* 是否锁定旋转
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*/
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setDisableRotate(value) {
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this.data.disable_rotate = value;
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},
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/**
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||
* 是否限制移动
|
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*/
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setLimitMove(value) {
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this.setData({
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_cut_animation: true,
|
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limit_move: !!value
|
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});
|
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},
|
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/**
|
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* 初始化图片，包括位置、大小、旋转角度
|
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*/
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imgReset() {
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this.setData({
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scale: 1,
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angle: 0,
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_img_top: wx.getSystemInfoSync().windowHeight / 2,
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_img_left: wx.getSystemInfoSync().windowWidth / 2,
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})
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},
|
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/**
|
||
* 加载（更换）图片
|
||
*/
|
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pushImg(src) {
|
||
if (src) {
|
||
this.setData({
|
||
imgSrc: src
|
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});
|
||
//发现是手动赋值直接返回，交给watch处理
|
||
return;
|
||
}
|
||
|
||
// getImageInfo接口传入 src: '' 会导致内存泄漏
|
||
|
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if (!this.data.imgSrc) return;
|
||
wx.getImageInfo({
|
||
src: this.data.imgSrc,
|
||
success: (res) => {
|
||
this.data.imageObject = res;
|
||
//图片非本地路径需要换成本地路径
|
||
if (this.data.imgSrc.search(/tmp/) == -1) {
|
||
this.setData({
|
||
imgSrc: res.path
|
||
});
|
||
}
|
||
//计算最后图片尺寸
|
||
this._imgComputeSize();
|
||
if (this.data.limit_move) {
|
||
//限制移动，不留空白处理
|
||
this._imgMarginDetectionScale();
|
||
}
|
||
this._draw();
|
||
},
|
||
fail: (err) => {
|
||
this.setData({
|
||
imgSrc: ''
|
||
});
|
||
}
|
||
});
|
||
},
|
||
imageLoad(e) {
|
||
setTimeout(() => {
|
||
this.triggerEvent('imageload', this.data.imageObject);
|
||
|
||
})
|
||
},
|
||
/**
|
||
* 设置图片放大缩小
|
||
*/
|
||
setScale(scale) {
|
||
if (!scale) return;
|
||
this.setData({
|
||
scale: scale
|
||
});
|
||
!this.data._canvas_overflow && this._draw();
|
||
},
|
||
/**
|
||
* 设置图片旋转角度
|
||
*/
|
||
setAngle(angle) {
|
||
if (!angle) return;
|
||
this.setData({
|
||
_cut_animation: true,
|
||
angle: angle
|
||
});
|
||
this._imgMarginDetectionScale();
|
||
!this.data._canvas_overflow && this._draw();
|
||
},
|
||
_initCanvas() {
|
||
//初始化canvas
|
||
if (!this.data.ctx) {
|
||
this.data.ctx = wx.createCanvasContext("image-cropper", this);
|
||
}
|
||
},
|
||
/**
|
||
* 根据开发者设置的图片目标尺寸计算实际尺寸
|
||
*/
|
||
_initImageSize() {
|
||
//处理宽高特殊单位 %>px
|
||
if (this.data.INIT_IMGWIDTH && typeof this.data.INIT_IMGWIDTH == "string" && this.data.INIT_IMGWIDTH.indexOf("%") != -1) {
|
||
let width = this.data.INIT_IMGWIDTH.replace("%", "");
|
||
this.data.INIT_IMGWIDTH = this.data.img_width = this.data.info.windowWidth / 100 * width;
|
||
}
|
||
if (this.data.INIT_IMGHEIGHT && typeof this.data.INIT_IMGHEIGHT == "string" && this.data.INIT_IMGHEIGHT.indexOf("%") != -1) {
|
||
let height = this.data.img_height.replace("%", "");
|
||
this.data.INIT_IMGHEIGHT = this.data.img_height = this.data.info.windowHeight / 100 * height;
|
||
}
|
||
},
|
||
/**
|
||
* 检测剪裁框位置是否在允许的范围内(屏幕内)
|
||
*/
|
||
_cutDetectionPosition() {
|
||
let _cutDetectionPositionTop = () => {
|
||
//检测上边距是否在范围内
|
||
if (this.data.cut_top < 0) {
|
||
this.setData({
|
||
cut_top: 0
|
||
});
|
||
}
|
||
if (this.data.cut_top > this.data.info.windowHeight - this.data.height) {
|
||
this.setData({
|
||
cut_top: this.data.info.windowHeight - this.data.height
|
||
});
|
||
}
|
||
},
|
||
_cutDetectionPositionLeft = () => {
|
||
//检测左边距是否在范围内
|
||
if (this.data.cut_left < 0) {
|
||
this.setData({
|
||
cut_left: 0
|
||
});
|
||
}
|
||
if (this.data.cut_left > this.data.info.windowWidth - this.data.width) {
|
||
this.setData({
|
||
cut_left: this.data.info.windowWidth - this.data.width
|
||
});
|
||
}
|
||
};
|
||
//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）
|
||
if (this.data.cut_top == null && this.data.cut_left == null) {
|
||
this._setCutCenter();
|
||
} else if (this.data.cut_top != null && this.data.cut_left != null) {
|
||
_cutDetectionPositionTop();
|
||
_cutDetectionPositionLeft();
|
||
} else if (this.data.cut_top != null && this.data.cut_left == null) {
|
||
_cutDetectionPositionTop();
|
||
this.setData({
|
||
cut_left: (this.data.info.windowWidth - this.data.width) / 2
|
||
});
|
||
} else if (this.data.cut_top == null && this.data.cut_left != null) {
|
||
_cutDetectionPositionLeft();
|
||
this.setData({
|
||
cut_top: (this.data.info.windowHeight - this.data.height) / 2
|
||
});
|
||
}
|
||
},
|
||
/**
|
||
* 检测canvas位置是否在允许的范围内(屏幕内)如果在屏幕外则不开启实时渲染
|
||
* 如果只写一个参数则另一个默认为0，都不写默认超出屏幕外
|
||
*/
|
||
_canvasDetectionPosition() {
|
||
if (this.data.canvas_top == null && this.data.canvas_left == null) {
|
||
this.data._canvas_overflow = false;
|
||
this.setData({
|
||
canvas_top: -5000,
|
||
canvas_left: -5000
|
||
});
|
||
} else if (this.data.canvas_top != null && this.data.canvas_left != null) {
|
||
if (this.data.canvas_top < -this.data.height || this.data.canvas_top > this.data.info.windowHeight) {
|
||
this.data._canvas_overflow = true;
|
||
} else {
|
||
this.data._canvas_overflow = false;
|
||
}
|
||
} else if (this.data.canvas_top != null && this.data.canvas_left == null) {
|
||
this.setData({
|
||
canvas_left: 0
|
||
});
|
||
} else if (this.data.canvas_top == null && this.data.canvas_left != null) {
|
||
this.setData({
|
||
canvas_top: 0
|
||
});
|
||
if (this.data.canvas_left < -this.data.width || this.data.canvas_left > this.data.info.windowWidth) {
|
||
this.data._canvas_overflow = true;
|
||
} else {
|
||
this.data._canvas_overflow = false;
|
||
}
|
||
}
|
||
},
|
||
/**
|
||
* 图片边缘检测-位置
|
||
*/
|
||
_imgMarginDetectionPosition(scale) {
|
||
if (!this.data.limit_move) return;
|
||
let left = this.data._img_left;
|
||
let top = this.data._img_top;
|
||
var scale = scale || this.data.scale;
|
||
let img_width = this.data.img_width;
|
||
let img_height = this.data.img_height;
|
||
if (this.data.angle / 90 % 2) {
|
||
img_width = this.data.img_height;
|
||
img_height = this.data.img_width;
|
||
}
|
||
left = this.data.cut_left + img_width * scale / 2 >= left ? left : this.data.cut_left + img_width * scale / 2;
|
||
left = this.data.cut_left + this.data.width - img_width * scale / 2 <= left ? left : this.data.cut_left + this.data.width - img_width * scale / 2;
|
||
top = this.data.cut_top + img_height * scale / 2 >= top ? top : this.data.cut_top + img_height * scale / 2;
|
||
top = this.data.cut_top + this.data.height - img_height * scale / 2 <= top ? top : this.data.cut_top + this.data.height - img_height * scale / 2;
|
||
this.setData({
|
||
_img_left: left,
|
||
_img_top: top,
|
||
scale: scale
|
||
})
|
||
},
|
||
/**
|
||
* 图片边缘检测-缩放
|
||
*/
|
||
_imgMarginDetectionScale() {
|
||
if (!this.data.limit_move) return;
|
||
let scale = this.data.scale;
|
||
let img_width = this.data.img_width;
|
||
let img_height = this.data.img_height;
|
||
if (this.data.angle / 90 % 2) {
|
||
img_width = this.data.img_height;
|
||
img_height = this.data.img_width;
|
||
}
|
||
if (img_width * scale < this.data.width) {
|
||
scale = this.data.width / img_width;
|
||
}
|
||
if (img_height * scale < this.data.height) {
|
||
scale = Math.max(scale, this.data.height / img_height);
|
||
}
|
||
this._imgMarginDetectionPosition(scale);
|
||
},
|
||
_setData(obj) {
|
||
let data = {};
|
||
for (var key in obj) {
|
||
if (this.data[key] != obj[key]) {
|
||
data[key] = obj[key];
|
||
}
|
||
}
|
||
this.setData(data);
|
||
return data;
|
||
},
|
||
/**
|
||
* 计算图片尺寸
|
||
*/
|
||
_imgComputeSize() {
|
||
let img_width = this.data.img_width,
|
||
img_height = this.data.img_height;
|
||
if (!this.data.INIT_IMGHEIGHT && !this.data.INIT_IMGWIDTH) {
|
||
//默认按图片最小边 = 对应裁剪框尺寸
|
||
img_width = this.data.imageObject.width;
|
||
img_height = this.data.imageObject.height;
|
||
if (img_width / img_height > this.data.width / this.data.height) {
|
||
img_height = this.data.height;
|
||
img_width = this.data.imageObject.width / this.data.imageObject.height * img_height;
|
||
} else {
|
||
img_width = this.data.width;
|
||
img_height = this.data.imageObject.height / this.data.imageObject.width * img_width;
|
||
}
|
||
} else if (this.data.INIT_IMGHEIGHT && !this.data.INIT_IMGWIDTH) {
|
||
img_width = this.data.imageObject.width / this.data.imageObject.height * this.data.INIT_IMGHEIGHT;
|
||
} else if (!this.data.INIT_IMGHEIGHT && this.data.INIT_IMGWIDTH) {
|
||
img_height = this.data.imageObject.height / this.data.imageObject.width * this.data.INIT_IMGWIDTH;
|
||
}
|
||
this.setData({
|
||
img_width: img_width,
|
||
img_height: img_height
|
||
});
|
||
},
|
||
//改变截取框大小
|
||
_computeCutSize() {
|
||
if (this.data.width > this.data.info.windowWidth) {
|
||
this.setData({
|
||
width: this.data.info.windowWidth,
|
||
});
|
||
} else if (this.data.width + this.data.cut_left > this.data.info.windowWidth) {
|
||
this.setData({
|
||
cut_left: this.data.info.windowWidth - this.data.cut_left,
|
||
});
|
||
};
|
||
if (this.data.height > this.data.info.windowHeight) {
|
||
this.setData({
|
||
height: this.data.info.windowHeight,
|
||
});
|
||
} else if (this.data.height + this.data.cut_top > this.data.info.windowHeight) {
|
||
this.setData({
|
||
cut_top: this.data.info.windowHeight - this.data.cut_top,
|
||
});
|
||
}!this.data._canvas_overflow && this._draw();
|
||
},
|
||
//开始触摸
|
||
_start(event) {
|
||
this.data._flag_img_endtouch = false;
|
||
if (event.touches.length == 1) {
|
||
//单指拖动
|
||
this.data._touch_img_relative[0] = {
|
||
x: (event.touches[0].clientX - this.data._img_left),
|
||
y: (event.touches[0].clientY - this.data._img_top)
|
||
}
|
||
} else {
|
||
//双指放大
|
||
let width = Math.abs(event.touches[0].clientX - event.touches[1].clientX);
|
||
let height = Math.abs(event.touches[0].clientY - event.touches[1].clientY);
|
||
this.data._touch_img_relative = [{
|
||
x: (event.touches[0].clientX - this.data._img_left),
|
||
y: (event.touches[0].clientY - this.data._img_top)
|
||
}, {
|
||
x: (event.touches[1].clientX - this.data._img_left),
|
||
y: (event.touches[1].clientY - this.data._img_top)
|
||
}];
|
||
this.data._hypotenuse_length = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2));
|
||
}!this.data._canvas_overflow && this._draw();
|
||
},
|
||
_move_throttle() {
|
||
//安卓需要节流
|
||
if (this.data.info.platform == 'android') {
|
||
clearTimeout(this.data.MOVE_THROTTLE);
|
||
this.data.MOVE_THROTTLE = setTimeout(() => {
|
||
this.data.MOVE_THROTTLE_FLAG = true;
|
||
}, 1000 / 40)
|
||
return this.data.MOVE_THROTTLE_FLAG;
|
||
} else {
|
||
this.data.MOVE_THROTTLE_FLAG = true;
|
||
}
|
||
},
|
||
_move(event) {
|
||
if (this.data._flag_img_endtouch || !this.data.MOVE_THROTTLE_FLAG) return;
|
||
this.data.MOVE_THROTTLE_FLAG = false;
|
||
this._move_throttle();
|
||
this._moveDuring();
|
||
if (event.touches.length == 1) {
|
||
//单指拖动
|
||
let left = (event.touches[0].clientX - this.data._touch_img_relative[0].x),
|
||
top = (event.touches[0].clientY - this.data._touch_img_relative[0].y);
|
||
//图像边缘检测,防止截取到空白
|
||
this.data._img_left = left;
|
||
this.data._img_top = top;
|
||
this._imgMarginDetectionPosition();
|
||
this.setData({
|
||
_img_left: this.data._img_left,
|
||
_img_top: this.data._img_top
|
||
});
|
||
} else {
|
||
//双指放大
|
||
let width = (Math.abs(event.touches[0].clientX - event.touches[1].clientX)),
|
||
height = (Math.abs(event.touches[0].clientY - event.touches[1].clientY)),
|
||
hypotenuse = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)),
|
||
scale = this.data.scale * (hypotenuse / this.data._hypotenuse_length),
|
||
current_deg = 0;
|
||
scale = scale <= this.data.min_scale ? this.data.min_scale : scale;
|
||
scale = scale >= this.data.max_scale ? this.data.max_scale : scale;
|
||
//图像边缘检测,防止截取到空白
|
||
this.data.scale = scale;
|
||
this._imgMarginDetectionScale();
|
||
//双指旋转(如果没禁用旋转)
|
||
let _touch_img_relative = [{
|
||
x: (event.touches[0].clientX - this.data._img_left),
|
||
y: (event.touches[0].clientY - this.data._img_top)
|
||
}, {
|
||
x: (event.touches[1].clientX - this.data._img_left),
|
||
y: (event.touches[1].clientY - this.data._img_top)
|
||
}];
|
||
if (!this.data.disable_rotate) {
|
||
let first_atan = 180 / Math.PI * Math.atan2(_touch_img_relative[0].y, _touch_img_relative[0].x);
|
||
let first_atan_old = 180 / Math.PI * Math.atan2(this.data._touch_img_relative[0].y, this.data._touch_img_relative[0].x);
|
||
let second_atan = 180 / Math.PI * Math.atan2(_touch_img_relative[1].y, _touch_img_relative[1].x);
|
||
let second_atan_old = 180 / Math.PI * Math.atan2(this.data._touch_img_relative[1].y, this.data._touch_img_relative[1].x);
|
||
//当前旋转的角度
|
||
let first_deg = first_atan - first_atan_old,
|
||
second_deg = second_atan - second_atan_old;
|
||
if (first_deg != 0) {
|
||
current_deg = first_deg;
|
||
} else if (second_deg != 0) {
|
||
current_deg = second_deg;
|
||
}
|
||
}
|
||
this.data._touch_img_relative = _touch_img_relative;
|
||
this.data._hypotenuse_length = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2));
|
||
//更新视图
|
||
this.setData({
|
||
angle: this.data.angle + current_deg,
|
||
scale: this.data.scale
|
||
});
|
||
}!this.data._canvas_overflow && this._draw();
|
||
},
|
||
//结束操作
|
||
_end(event) {
|
||
this.data._flag_img_endtouch = true;
|
||
this._moveStop();
|
||
},
|
||
//点击中间剪裁框处理
|
||
_click(event) {
|
||
if (!this.data.imgSrc) {
|
||
//调起上传
|
||
this.upload();
|
||
return;
|
||
}
|
||
this._draw(() => {
|
||
let x = event.detail ? event.detail.x : event.touches[0].clientX;
|
||
let y = event.detail ? event.detail.y : event.touches[0].clientY;
|
||
if ((x >= this.data.cut_left && x <= (this.data.cut_left + this.data.width)) && (y >= this.data.cut_top && y <= (this.data.cut_top + this.data.height))) {
|
||
//生成图片并回调
|
||
wx.canvasToTempFilePath({
|
||
width: this.data.width * this.data.export_scale,
|
||
height: Math.round(this.data.height * this.data.export_scale),
|
||
destWidth: this.data.width * this.data.export_scale,
|
||
destHeight: Math.round(this.data.height) * this.data.export_scale,
|
||
fileType: 'png',
|
||
quality: this.data.quality,
|
||
canvasId: this.data.el,
|
||
success: (res) => {
|
||
this.triggerEvent('tapcut', {
|
||
url: res.tempFilePath,
|
||
width: this.data.width * this.data.export_scale,
|
||
height: this.data.height * this.data.export_scale
|
||
});
|
||
}
|
||
}, this)
|
||
}
|
||
});
|
||
},
|
||
//渲染
|
||
_draw(callback) {
|
||
if (!this.data.imgSrc) return;
|
||
let draw = () => {
|
||
//图片实际大小
|
||
let img_width = this.data.img_width * this.data.scale * this.data.export_scale;
|
||
let img_height = this.data.img_height * this.data.scale * this.data.export_scale;
|
||
//canvas和图片的相对距离
|
||
var xpos = this.data._img_left - this.data.cut_left;
|
||
var ypos = this.data._img_top - this.data.cut_top;
|
||
//旋转画布
|
||
this.data.ctx.translate(xpos * this.data.export_scale, ypos * this.data.export_scale);
|
||
this.data.ctx.rotate(this.data.angle * Math.PI / 180);
|
||
this.data.ctx.drawImage(this.data.imgSrc, -img_width / 2, -img_height / 2, img_width, img_height);
|
||
this.data.ctx.draw(false, () => {
|
||
callback && callback();
|
||
});
|
||
}
|
||
if (this.data.ctx.width != this.data.width || this.data.ctx.height != this.data.height) {
|
||
//优化拖动裁剪框，所以必须把宽高设置放在离用户触发渲染最近的地方
|
||
this.setData({
|
||
_canvas_height: this.data.height,
|
||
_canvas_width: this.data.width,
|
||
}, () => {
|
||
//延迟40毫秒防止点击过快出现拉伸或裁剪过多
|
||
setTimeout(() => {
|
||
draw();
|
||
}, 40);
|
||
});
|
||
} else {
|
||
draw();
|
||
}
|
||
},
|
||
//裁剪框处理
|
||
_cutTouchMove(e) {
|
||
if (this.data._flag_cut_touch && this.data.MOVE_THROTTLE_FLAG) {
|
||
if (this.data.disable_ratio && (this.data.disable_width || this.data.disable_height)) return;
|
||
//节流
|
||
this.data.MOVE_THROTTLE_FLAG = false;
|
||
this._move_throttle();
|
||
let width = this.data.width,
|
||
height = this.data.height,
|
||
cut_top = this.data.cut_top,
|
||
cut_left = this.data.cut_left,
|
||
size_correct = () => {
|
||
width = width <= this.data.max_width ? width >= this.data.min_width ? width : this.data.min_width : this.data.max_width;
|
||
height = height <= this.data.max_height ? height >= this.data.min_height ? height : this.data.min_height : this.data.max_height;
|
||
},
|
||
size_inspect = () => {
|
||
if ((width > this.data.max_width || width < this.data.min_width || height > this.data.max_height || height < this.data.min_height) && this.data.disable_ratio) {
|
||
size_correct();
|
||
return false;
|
||
} else {
|
||
size_correct();
|
||
return true;
|
||
}
|
||
};
|
||
height = this.data.CUT_START.height + ((this.data.CUT_START.corner > 1 && this.data.CUT_START.corner < 4 ? 1 : -1) * (this.data.CUT_START.y - e.touches[0].clientY));
|
||
switch (this.data.CUT_START.corner) {
|
||
case 1:
|
||
width = this.data.CUT_START.width + this.data.CUT_START.x - e.touches[0].clientX;
|
||
if (this.data.disable_ratio) {
|
||
height = width / (this.data.width / this.data.height)
|
||
}
|
||
if (!size_inspect()) return;
|
||
cut_left = this.data.CUT_START.cut_left - (width - this.data.CUT_START.width);
|
||
break
|
||
case 2:
|
||
width = this.data.CUT_START.width + this.data.CUT_START.x - e.touches[0].clientX;
|
||
if (this.data.disable_ratio) {
|
||
height = width / (this.data.width / this.data.height)
|
||
}
|
||
if (!size_inspect()) return;
|
||
cut_top = this.data.CUT_START.cut_top - (height - this.data.CUT_START.height)
|
||
cut_left = this.data.CUT_START.cut_left - (width - this.data.CUT_START.width)
|
||
break
|
||
case 3:
|
||
width = this.data.CUT_START.width - this.data.CUT_START.x + e.touches[0].clientX;
|
||
if (this.data.disable_ratio) {
|
||
height = width / (this.data.width / this.data.height)
|
||
}
|
||
if (!size_inspect()) return;
|
||
cut_top = this.data.CUT_START.cut_top - (height - this.data.CUT_START.height);
|
||
break
|
||
case 4:
|
||
width = this.data.CUT_START.width - this.data.CUT_START.x + e.touches[0].clientX;
|
||
if (this.data.disable_ratio) {
|
||
height = width / (this.data.width / this.data.height)
|
||
}
|
||
if (!size_inspect()) return;
|
||
break
|
||
}
|
||
if (!this.data.disable_width && !this.data.disable_height) {
|
||
this.setData({
|
||
width: width,
|
||
cut_left: cut_left,
|
||
height: height,
|
||
cut_top: cut_top,
|
||
})
|
||
} else if (!this.data.disable_width) {
|
||
this.setData({
|
||
width: width,
|
||
cut_left: cut_left
|
||
})
|
||
} else if (!this.data.disable_height) {
|
||
this.setData({
|
||
height: height,
|
||
cut_top: cut_top
|
||
})
|
||
}
|
||
this._imgMarginDetectionScale();
|
||
}
|
||
},
|
||
_cutTouchStart(e) {
|
||
let currentX = e.touches[0].clientX;
|
||
let currentY = e.touches[0].clientY;
|
||
let cutbox_top4 = this.data.cut_top + this.data.height - 30;
|
||
let cutbox_bottom4 = this.data.cut_top + this.data.height + 20;
|
||
let cutbox_left4 = this.data.cut_left + this.data.width - 30;
|
||
let cutbox_right4 = this.data.cut_left + this.data.width + 30;
|
||
|
||
let cutbox_top3 = this.data.cut_top - 30;
|
||
let cutbox_bottom3 = this.data.cut_top + 30;
|
||
let cutbox_left3 = this.data.cut_left + this.data.width - 30;
|
||
let cutbox_right3 = this.data.cut_left + this.data.width + 30;
|
||
|
||
let cutbox_top2 = this.data.cut_top - 30;
|
||
let cutbox_bottom2 = this.data.cut_top + 30;
|
||
let cutbox_left2 = this.data.cut_left - 30;
|
||
let cutbox_right2 = this.data.cut_left + 30;
|
||
|
||
let cutbox_top1 = this.data.cut_top + this.data.height - 30;
|
||
let cutbox_bottom1 = this.data.cut_top + this.data.height + 30;
|
||
let cutbox_left1 = this.data.cut_left - 30;
|
||
let cutbox_right1 = this.data.cut_left + 30;
|
||
if (currentX > cutbox_left4 && currentX < cutbox_right4 && currentY > cutbox_top4 && currentY < cutbox_bottom4) {
|
||
this._moveDuring();
|
||
this.data._flag_cut_touch = true;
|
||
this.data._flag_img_endtouch = true;
|
||
this.data.CUT_START = {
|
||
width: this.data.width,
|
||
height: this.data.height,
|
||
x: currentX,
|
||
y: currentY,
|
||
corner: 4
|
||
}
|
||
} else if (currentX > cutbox_left3 && currentX < cutbox_right3 && currentY > cutbox_top3 && currentY < cutbox_bottom3) {
|
||
this._moveDuring();
|
||
this.data._flag_cut_touch = true;
|
||
this.data._flag_img_endtouch = true;
|
||
this.data.CUT_START = {
|
||
width: this.data.width,
|
||
height: this.data.height,
|
||
x: currentX,
|
||
y: currentY,
|
||
cut_top: this.data.cut_top,
|
||
cut_left: this.data.cut_left,
|
||
corner: 3
|
||
}
|
||
} else if (currentX > cutbox_left2 && currentX < cutbox_right2 && currentY > cutbox_top2 && currentY < cutbox_bottom2) {
|
||
this._moveDuring();
|
||
this.data._flag_cut_touch = true;
|
||
this.data._flag_img_endtouch = true;
|
||
this.data.CUT_START = {
|
||
width: this.data.width,
|
||
height: this.data.height,
|
||
cut_top: this.data.cut_top,
|
||
cut_left: this.data.cut_left,
|
||
x: currentX,
|
||
y: currentY,
|
||
corner: 2
|
||
}
|
||
} else if (currentX > cutbox_left1 && currentX < cutbox_right1 && currentY > cutbox_top1 && currentY < cutbox_bottom1) {
|
||
this._moveDuring();
|
||
this.data._flag_cut_touch = true;
|
||
this.data._flag_img_endtouch = true;
|
||
this.data.CUT_START = {
|
||
width: this.data.width,
|
||
height: this.data.height,
|
||
cut_top: this.data.cut_top,
|
||
cut_left: this.data.cut_left,
|
||
x: currentX,
|
||
y: currentY,
|
||
corner: 1
|
||
}
|
||
}
|
||
},
|
||
_cutTouchEnd(e) {
|
||
this._moveStop();
|
||
this.data._flag_cut_touch = false;
|
||
},
|
||
//停止移动时需要做的操作
|
||
_moveStop() {
|
||
//清空之前的自动居中延迟函数并添加最新的
|
||
clearTimeout(this.data.TIME_CUT_CENTER);
|
||
this.data.TIME_CUT_CENTER = setTimeout(() => {
|
||
//动画启动
|
||
if (!this.data._cut_animation) {
|
||
this.setData({
|
||
_cut_animation: true
|
||
});
|
||
}
|
||
this.setCutCenter();
|
||
}, 1000)
|
||
//清空之前的背景变化延迟函数并添加最新的
|
||
clearTimeout(this.data.TIME_BG);
|
||
this.data.TIME_BG = setTimeout(() => {
|
||
if (this.data._flag_bright) {
|
||
this.setData({
|
||
_flag_bright: false
|
||
});
|
||
}
|
||
}, 2000)
|
||
},
|
||
//移动中
|
||
_moveDuring() {
|
||
//清空之前的自动居中延迟函数
|
||
clearTimeout(this.data.TIME_CUT_CENTER);
|
||
//清空之前的背景变化延迟函数
|
||
clearTimeout(this.data.TIME_BG);
|
||
//高亮背景
|
||
if (!this.data._flag_bright) {
|
||
this.setData({
|
||
_flag_bright: true
|
||
});
|
||
}
|
||
},
|
||
//监听器
|
||
_watcher() {
|
||
Object.keys(this.data).forEach(v => {
|
||
this._observe(this.data, v, this.data.watch[v]);
|
||
})
|
||
},
|
||
_observe(obj, key, watchFun) {
|
||
var val = obj[key];
|
||
Object.defineProperty(obj, key, {
|
||
configurable: true,
|
||
enumerable: true,
|
||
set: (value) => {
|
||
val = value;
|
||
watchFun && watchFun(val, this);
|
||
},
|
||
get() {
|
||
if (val && '_img_top|img_left||width|height|min_width|max_width|min_height|max_height|export_scale|cut_top|cut_left|canvas_top|canvas_left|img_width|img_height|scale|angle|min_scale|max_scale'.indexOf(key) != -1) {
|
||
let ret = parseFloat(parseFloat(val).toFixed(3));
|
||
if (typeof val == "string" && val.indexOf("%") != -1) {
|
||
ret += '%';
|
||
}
|
||
return ret;
|
||
}
|
||
return val;
|
||
}
|
||
})
|
||
},
|
||
_preventTouchMove() {}
|
||
}
|
||
}) |