499 lines
13 KiB
Vue
499 lines
13 KiB
Vue
<template>
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<view>
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<input type="hidden" :name="name" :value="pic" style="display:none;" />
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<view v-if="doing" class="_vtop" :style="{top:(header_statusbar_height+header_title_height)+'px'}" style="left:0;right:0;bottom:0;background:#ffffff;z-index: 998;">
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<view style="position: absolute;top:5px;left:5px;bottom:5px;width:4em;">
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<button @tap="btn_close" class="lbtn" style="top:2em;">{{lang('handsign.close')}}</button>
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<button @tap="btn_clear" class="lbtn" style="top:8em;">{{lang('handsign.rewrite')}}</button>
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<button @tap="btn_done" type="primary" class="lbtn" style="bottom:2em;">{{lang('handsign.done')}}</button>
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</view>
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<view style="position:absolute;top:5px;left:4.5em;right:5px;bottom:5px;border: 4rpx dashed #e9e9e9;">
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<canvas class="handsign" canvas-id="handsign" style="background:#ffffff;width:100%;height: 100%;" disable-scroll="true" @touchstart="uploadScaleStart" @touchmove="uploadScaleMove" @touchend="uploadScaleEnd">
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</canvas>
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</view>
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</view>
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<view v-else>
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<image :src="file_stor(pic)" mode="aspectFill" style="width:70vw;height:35vw;border: 1px solid #cccccc;" @tap="showsign"></image>
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</view>
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</view>
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</template>
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<script>
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export default {
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behaviors: ['uni://form-field-group'],
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props: {
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name: {
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type: String
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},
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value: {
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type: String,
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default: ''
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},
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uploadurl: {
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type: String,
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default: ''
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},
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imgact: {
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type: String,
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default: 'cp|300|70'
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},
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color: {
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type: String,
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default: '#0555ad'
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}
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},
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data() {
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return {
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doing: false,
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canvasWidth: 0,
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canvasHeight: 0,
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lineSize: 1.5 // 笔记倍数
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,
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lineMin: 1 // 最小笔画半径
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,
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lineMax: 4 // 最大笔画半径
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,
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pressure: 1 // 默认压力
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,
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smoothness: 60 //顺滑度，用60的距离来计算速度
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,
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currentPoint: {},
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currentLine: [] // 当前线条
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,
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firstTouch: true // 第一次触发
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,
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radius: 1 //画圆的半径
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,
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cutArea: {
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top: 0,
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right: 0,
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bottom: 0,
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left: 0
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} //裁剪区域
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,
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bethelPoint: [] //保存所有线条 生成的贝塞尔点；
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,
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lastPoint: 0,
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chirography: [] //笔迹
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,
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currentChirography: {} //当前笔迹
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,
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linePrack: [] //划线轨迹 , 生成线条的实际点
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,
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pic: ''
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};
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},
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watch: {
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value(newD, oldD) {
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this.showvalue();
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}
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},
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mounted() {
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this.showvalue('created');
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},
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methods: {
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showvalue(frombase) {
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var val = this.value || '';
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this.pic = val;
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if (frombase) {
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this.$emit('change', {
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name: this.name,
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from: frombase,
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value: val
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});
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}
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},
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uploadScaleStart: function(e) {
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if (e.type != 'touchstart') return false;
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this.ctx.setFillStyle(this.color); // 初始线条设置颜色
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//this.ctx.setGlobalAlpha(this.transparent); // 设置半透明
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var currentPoint = {
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x: e.touches[0].x,
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y: e.touches[0].y
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}
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var currentLine = this.currentLine;
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currentLine.unshift({
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time: new Date().getTime(),
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dis: 0,
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x: currentPoint.x,
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y: currentPoint.y
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})
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this.currentPoint = currentPoint;
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if (this.firstTouch) {
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this.cutArea = {
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top: currentPoint.y,
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right: currentPoint.x,
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bottom: currentPoint.y,
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left: currentPoint.x
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};
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this.firstTouch = false;
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}
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this.pointToLine(currentLine);
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}
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// 笔迹移动
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,
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uploadScaleMove: function(e) {
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if (e.type != 'touchmove')
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return false;
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if (e.cancelable) {
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// 判断默认行为是否已经被禁用
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if (!e.defaultPrevented) {
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e.preventDefault();
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}
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}
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var point = {
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x: e.touches[0].x,
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y: e.touches[0].y
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}
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//测试裁剪
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if (point.y < this.cutArea.top) {
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this.cutArea.top = point.y;
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}
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if (point.y < 0) this.cutArea.top = 0;
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if (point.x > this.cutArea.right) {
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this.cutArea.right = point.x;
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}
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if (this.canvasWidth - point.x <= 0) {
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this.cutArea.right = this.canvasWidth;
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}
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if (point.y > this.cutArea.bottom) {
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this.cutArea.bottom = point.y;
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}
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if (this.canvasHeight - point.y <= 0) {
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this.cutArea.bottom = this.canvasHeight;
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}
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if (point.x < this.cutArea.left) {
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this.cutArea.left = point.x;
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}
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if (point.x < 0) this.cutArea.left = 0;
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this.lastPoint = this.currentPoint;
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this.currentPoint = point;
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var currentLine = this.currentLine;
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currentLine.unshift({
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time: new Date().getTime(),
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dis: this.distance(this.currentPoint, this.lastPoint),
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x: point.x,
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y: point.y
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});
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this.pointToLine(currentLine);
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}
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// 笔迹结束
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,
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uploadScaleEnd(e) {
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if (e.type != 'touchend') return 0;
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if (e.changedTouches.length == 0)
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return;
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var point = {
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x: e.changedTouches[0].x,
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y: e.changedTouches[0].y
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}
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this.lastPoint = this.currentPoint;
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this.currentPoint = point;
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var currentLine = this.currentLine
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currentLine.unshift({
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time: new Date().getTime(),
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dis: this.distance(this.currentPoint, this.lastPoint),
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x: point.x,
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y: point.y
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})
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if (currentLine.length > 2) {
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var info = (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length;
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}
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//一笔结束，保存笔迹的坐标点，清空，当前笔迹
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//增加判断是否在手写区域；
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this.pointToLine(currentLine);
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var currentChirography = {
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lineSize: this.lineSize,
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lineColor: this.color
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};
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this.chirography.unshift(currentChirography);
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var linePrack = this.linePrack;
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linePrack.unshift(this.currentLine);
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this.linePrack = linePrack;
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this.currentLine = [];
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}
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//画两点之间的线条；参数为:line，会绘制最近的开始的两个点；
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,
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pointToLine: function(line) {
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this.calcBethelLine(line);
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return;
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}
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//计算插值的方式；
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,
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calcBethelLine: function(line) {
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if (line.length <= 1) {
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line[0].r = this.radius;
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return;
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}
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var x0, x1, x2, y0, y1, y2, r0, r1, r2, len, lastRadius, dis = 0,
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time = 0,
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curveValue = 0.5;
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if (line.length <= 2) {
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x0 = line[1].x
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y0 = line[1].y
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x2 = line[1].x + (line[0].x - line[1].x) * curveValue;
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y2 = line[1].y + (line[0].y - line[1].y) * curveValue;
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//x2 = line[1].x;
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//y2 = line[1].y;
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x1 = x0 + (x2 - x0) * curveValue;
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y1 = y0 + (y2 - y0) * curveValue;;
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} else {
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x0 = line[2].x + (line[1].x - line[2].x) * curveValue;
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y0 = line[2].y + (line[1].y - line[2].y) * curveValue;
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x1 = line[1].x;
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y1 = line[1].y;
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x2 = x1 + (line[0].x - x1) * curveValue;
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y2 = y1 + (line[0].y - y1) * curveValue;
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}
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//从计算公式看，三个点分别是(x0,y0),(x1,y1),(x2,y2) ；(x1,y1)这个是控制点，控制点不会落在曲线上；实际上，这个点还会手写获取的实际点，却落在曲线上
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len = this.distance({
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x: x2,
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y: y2
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}, {
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x: x0,
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y: y0
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});
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lastRadius = this.radius;
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for (var n = 0; n < line.length - 1; n++) {
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dis += line[n].dis;
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time += line[n].time - line[n + 1].time;
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if (dis > this.smoothness) break;
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}
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this.radius = Math.min(time / len * this.pressure + this.lineMin, this.lineMax) * this.lineSize;
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line[0].r = this.radius;
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//计算笔迹半径；
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if (line.length <= 2) {
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r0 = (lastRadius + this.radius) / 2;
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r1 = r0;
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r2 = r1;
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//return;
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} else {
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r0 = (line[2].r + line[1].r) / 2;
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r1 = line[1].r;
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r2 = (line[1].r + line[0].r) / 2;
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}
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var n = 5;
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var point = [];
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for (var i = 0; i < n; i++) {
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var t = i / (n - 1);
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var x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2;
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var y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2;
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var r = lastRadius + (this.radius - lastRadius) / n * i;
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point.push({
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x: x,
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y: y,
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r: r
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});
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if (point.length == 3) {
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var a = this.ctaCalc(point[0].x, point[0].y, point[0].r, point[1].x, point[1].y, point[1].r, point[2].x, point[2].y, point[2].r);
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a[0].color = this.color;
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this.bethelDraw(a, 1);
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point = [{
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x: x,
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y: y,
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r: r
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}];
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}
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}
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this.currentLine = line;
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}
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//求两点之间距离
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,
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distance: function(a, b) {
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var x = b.x - a.x;
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var y = b.y - a.y;
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return Math.sqrt(x * x + y * y);
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},
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ctaCalc: function(x0, y0, r0, x1, y1, r1, x2, y2, r2) {
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var a = [],
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vx01, vy01, norm, n_x0, n_y0, vx21, vy21, n_x2, n_y2;
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vx01 = x1 - x0;
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vy01 = y1 - y0;
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norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2;
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vx01 = vx01 / norm * r0;
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vy01 = vy01 / norm * r0;
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n_x0 = vy01;
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n_y0 = -vx01;
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vx21 = x1 - x2;
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vy21 = y1 - y2;
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norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2;
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vx21 = vx21 / norm * r2;
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vy21 = vy21 / norm * r2;
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n_x2 = -vy21;
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n_y2 = vx21;
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a.push({
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mx: x0 + n_x0,
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my: y0 + n_y0,
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color: "#1A1A1A"
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});
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a.push({
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c1x: x1 + n_x0,
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c1y: y1 + n_y0,
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c2x: x1 + n_x2,
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c2y: y1 + n_y2,
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ex: x2 + n_x2,
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ey: y2 + n_y2
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});
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a.push({
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c1x: x2 + n_x2 - vx21,
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c1y: y2 + n_y2 - vy21,
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c2x: x2 - n_x2 - vx21,
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c2y: y2 - n_y2 - vy21,
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ex: x2 - n_x2,
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ey: y2 - n_y2
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});
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a.push({
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c1x: x1 - n_x2,
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c1y: y1 - n_y2,
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c2x: x1 - n_x0,
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c2y: y1 - n_y0,
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ex: x0 - n_x0,
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ey: y0 - n_y0
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});
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a.push({
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c1x: x0 - n_x0 - vx01,
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c1y: y0 - n_y0 - vy01,
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c2x: x0 + n_x0 - vx01,
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c2y: y0 + n_y0 - vy01,
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ex: x0 + n_x0,
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ey: y0 + n_y0
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});
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a[0].mx = a[0].mx.toFixed(1);
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a[0].mx = parseFloat(a[0].mx);
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a[0].my = a[0].my.toFixed(1);
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a[0].my = parseFloat(a[0].my);
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for (var i = 1; i < a.length; i++) {
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a[i].c1x = a[i].c1x.toFixed(1);
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a[i].c1x = parseFloat(a[i].c1x);
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a[i].c1y = a[i].c1y.toFixed(1);
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a[i].c1y = parseFloat(a[i].c1y);
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a[i].c2x = a[i].c2x.toFixed(1);
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a[i].c2x = parseFloat(a[i].c2x);
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a[i].c2y = a[i].c2y.toFixed(1);
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a[i].c2y = parseFloat(a[i].c2y);
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a[i].ex = a[i].ex.toFixed(1);
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a[i].ex = parseFloat(a[i].ex);
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a[i].ey = a[i].ey.toFixed(1);
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a[i].ey = parseFloat(a[i].ey);
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}
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return a;
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},
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bethelDraw: function(point, is_fill, color) {
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var ctx = this.ctx;
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ctx.beginPath();
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ctx.moveTo(point[0].mx, point[0].my);
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if (undefined != color) {
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ctx.setFillStyle(color);
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ctx.setStrokeStyle(color);
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} else {
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ctx.setFillStyle(point[0].color);
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ctx.setStrokeStyle(point[0].color);
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}
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for (var i = 1; i < point.length; i++) {
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ctx.bezierCurveTo(point[i].c1x, point[i].c1y, point[i].c2x, point[i].c2y, point[i].ex, point[i].ey);
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}
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ctx.stroke();
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if (undefined != is_fill) {
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ctx.fill(); //填充图形 ( 后绘制的图形会覆盖前面的图形, 绘制时注意先后顺序 )
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}
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ctx.draw(true)
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},
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setCanvasBg: function(color) {
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this.ctx.rect(0, 0, this.canvasWidth, this.canvasHeight - 4);
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this.ctx.setFillStyle(color);
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this.ctx.fill();
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this.ctx.draw();
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},
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showsign: function() {
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this.doing = true;
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this.$nextTick(() => {
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this.ctx = uni.createCanvasContext('handsign', this);
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var query = uni.createSelectorQuery();
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var thos = this;
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query.in(this).select('.handsign').boundingClientRect(function(rect) {
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thos.canvasWidth = rect.width;
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thos.canvasHeight = rect.height;
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thos.setCanvasBg('#ffffff');
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}).exec();
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});
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},
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btn_close: function() {
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this.doing = false;
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},
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btn_clear: function() {
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this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
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this.ctx.draw();
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this.setCanvasBg("#ffffff");
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this.linePrack = [];
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},
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btn_done: function() {
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var thos = this;
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if (this.linePrack.length == 0)
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return this.toast('请签名后再点击完成');
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uni.canvasToTempFilePath({
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canvasId: 'handsign',
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fileType: 'png',
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quality: 1,
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success: res => {
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var updata = {};
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updata._uid = this.getstorage("uid"); //UserID
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updata._sid = this.getstorage("sid"); //SID
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updata.imgact = thos.imgact;
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updata.imgrotate = '90';
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uni.uploadFile({
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url: this.uploadurl,
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filePath: res.tempFilePath,
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name: 'file',
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formData: updata,
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header: {
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'ciyauth': this.getstorage("_auth"),
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'ciyorg': this.getstorage("_org")
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},
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success: res => {
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var jsonup = this.json_parse(res.data);
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if (jsonup === null)
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jsonup = {
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result: false,
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msg: 'JSON Parse ERROR:' + res.data.substr(0, 30)
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};
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if (jsonup.code != 1) {
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return this.alert('上传失败:' + jsonup.errmsg);
|
||
}
|
||
thos.pic = jsonup.url;
|
||
thos.doing = false;
|
||
thos.$emit('input', thos.pic);
|
||
thos.$emit('change', {
|
||
name: thos.name,
|
||
from: 'sign',
|
||
value: thos.pic
|
||
});
|
||
}
|
||
});
|
||
}
|
||
}, this);
|
||
|
||
}
|
||
}
|
||
}
|
||
</script>
|
||
|
||
<style scoped>
|
||
._vtop{
|
||
position: fixed;
|
||
left: 0;
|
||
right: 0;
|
||
z-index: 1;
|
||
}
|
||
.lbtn {
|
||
transform: rotate(90deg);
|
||
position: absolute;
|
||
white-space: nowrap;
|
||
}
|
||
</style> |