【uniapp】签名组件，兼容vue2vue3

网上找了个源码改吧改吧，清除了没用的功能和兼容性，基于uniapp开发的

样子

在这里插入图片描述

vue2 使用方法，具体的可以根据业务自行修改

<signature ref="signature" width="100%" height="410rpx"></signature>

confirm(){this.$refs['signature'].getCavasTempFile((url) => {//外部调用子组件的方法获取签名的base64})
}

vue2源码

<template><view class="canvas_wrapper" ref="canvas_wrappers" :style="canvasStyle"><canvas class="handWriting" disable-scroll="true" @touchstart="uploadScaleStart" @touchmove="uploadScaleMove"@touchend="uploadScaleEnd" canvas-id="handWriting"></canvas></view>
</template><script>export default {props: {width: {type: String,default: '100%'},height: {type: String,default: '200rpx'},},data() {return {canvasName: 'handWriting',ctx: '',canvasWidth: 0,canvasHeight: 0,transparent: 1, // 透明度selectColor: 'black',lineColor: '#1a1a1a', // 颜色lineSize: 1.5, // 笔迹倍数lineMin: 0.5, // 最小笔画半径lineMax: 8, // 最大笔画半径pressure: 1, // 默认压力smoothness: 60, //顺滑度，用60的距离来计算速度currentPoint: {},currentLine: [], // 当前线条firstTouch: true, // 第一次触发radius: 1, //画圆的半径cutArea: {top: 0,right: 0,bottom: 0,left: 0}, //裁剪区域bethelPoint: [], //保存所有线条 生成的贝塞尔点；lastPoint: 0,chirography: [], //笔迹currentChirography: {}, //当前笔迹linePrack: [], //划线轨迹 , 生成线条的实际点half: 0 //绘制一半点};},computed: {canvasStyle() {return `width:${this.widht};height:${this.height}`}},mounted() {this.containerEnter()},methods: {containerEnter() {let canvasName = this.canvasNamelet ctx = uni.createCanvasContext(canvasName, this)this.ctx = ctx;var query = uni.createSelectorQuery().in(this);query.select('.canvas_wrapper').boundingClientRect(rect => {this.canvasWidth = rect.width;this.canvasHeight = rect.height;/* 将canvas背景设置为 白底，不设置  导出的canvas的背景为透明 */this.setCanvasBg('rgba(0,0,0,0)');}).exec();},containerAfter() {this.retDraw()},// 获取临时文件getCavasTempFile(fn) {uni.canvasToTempFilePath({destWidth: 200,destHeight: 200,canvasId: 'handWriting',success: (res) => {//签名成功回调fn(res.tempFilePath)this.containerAfter()},fail: (err) => {console.log('图片临时文件生成失败', err);}}, this)},// 笔迹开始uploadScaleStart(e) {if (e.type != 'touchstart') return false;this.ctx.setFillStyle(this.lineColor); // 初始线条设置颜色this.ctx.setGlobalAlpha(this.transparent); // 设置半透明let currentPoint = {x: e.touches[0].x,y: e.touches[0].y}let currentLine = this.currentLine;currentLine.unshift({time: new Date().getTime(),dis: 0,x: currentPoint.x,y: currentPoint.y})this.currentPoint = currentPointif (this.firstTouch) {this.currentPoint = {top: currentPoint.y,right: currentPoint.x,bottom: currentPoint.y,left: currentPoint.x}this.firstTouch = false;}this.pointToLine(currentLine);},// 笔迹移动uploadScaleMove(e) {this.half++;if ((this.half % 3) != 0) {return false}if (e.type != 'touchmove') return false;if (e.cancelable) {// 判断默认行为是否已经被禁用if (!e.defaultPrevented) {e.preventDefault();}}let point = {x: e.touches[0].x,y: e.touches[0].y}//测试裁剪if (point.y < this.cutArea.top) {this.cutArea.top = point.y;}if (point.y < 0) this.cutArea.top = 0;if (point.x > this.cutArea.right) {this.cutArea.right = point.x;}if (this.canvasWidth - point.x <= 0) {this.cutArea.right = this.canvasWidth;}if (point.y > this.cutArea.bottom) {this.cutArea.bottom = point.y;}if (this.canvasHeight - point.y <= 0) {this.cutArea.bottom = this.canvasHeight;}if (point.x < this.cutArea.left) {this.cutArea.left = point.x;}if (point.x < 0) this.cutArea.left = 0;this.lastPoint = this.currentPointthis.currentPoint = pointlet currentLine = this.currentLinecurrentLine.unshift({time: new Date().getTime(),dis: this.distance(this.currentPoint, this.lastPoint),x: point.x,y: point.y})this.pointToLine(currentLine);},// 笔迹结束uploadScaleEnd(e) {if (e.type != 'touchend') return 0;let point = {x: e.changedTouches[0].x,y: e.changedTouches[0].y}this.lastPoint = this.currentPoint;this.currentPoint = point;let currentLine = this.currentLinecurrentLine.unshift({time: new Date().getTime(),dis: this.distance(this.currentPoint, this.lastPoint),x: point.x,y: point.y})if (currentLine.length > 2) {var info = (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length;//$("#info").text(info.toFixed(2));}//一笔结束，保存笔迹的坐标点，清空，当前笔迹//增加判断是否在手写区域；this.pointToLine(currentLine);var currentChirography = {lineSize: this.lineSize,lineColor: this.lineColor};var chirography = this.chirographychirography.unshift(currentChirography);this.chirography = chirographyvar linePrack = this.linePracklinePrack.unshift(this.currentLine);this.half = 0;this.linePrack = linePrack;this.currentLine = [];},retDraw() {this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight)this.ctx.draw();//设置canvas背景this.setCanvasBg('rgba(0,0,0,0)');},//画两点之间的线条；参数为:line，会绘制最近的开始的两个点；pointToLine(line) {this.calcBethelLine(line);return;},//计算插值的方式；calcBethelLine(line) {if (line.length <= 1) {line[0].r = this.radius;return;}let x0, x1, x2, y0, y1, y2, r0, r1, r2, len, lastRadius, dis = 0,time = 0,curveValue = 0.5;if (line.length <= 2) {x0 = line[1].xy0 = line[1].yx2 = line[1].x + (line[0].x - line[1].x) * curveValue;y2 = line[1].y + (line[0].y - line[1].y) * curveValue;x1 = x0 + (x2 - x0) * curveValue;y1 = y0 + (y2 - y0) * curveValue;;} else {x0 = line[2].x + (line[1].x - line[2].x) * curveValue;y0 = line[2].y + (line[1].y - line[2].y) * curveValue;x1 = line[1].x;y1 = line[1].y;x2 = x1 + (line[0].x - x1) * curveValue;y2 = y1 + (line[0].y - y1) * curveValue;}//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len = this.distance({x: x2,y: y2}, {x: x0,y: y0});lastRadius = this.radius;for (let n = 0; n < line.length - 1; n++) {dis += line[n].dis;time += line[n].time - line[n + 1].time;if (dis > this.smoothness) break;}this.radius = Math.min(time / len * this.pressure + this.lineMin, this.lineMax) * this.lineSizeline[0].r = this.radius;//计算笔迹半径；if (line.length <= 2) {r0 = (lastRadius + this.radius) / 2;r1 = r0;r2 = r1;//return;} else {r0 = (line[2].r + line[1].r) / 2;r1 = line[1].r;r2 = (line[1].r + line[0].r) / 2;}let n = 5;let point = [];for (let i = 0; i < n; i++) {let t = i / (n - 1);let x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2;let y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2;let r = lastRadius + (this.radius - lastRadius) / n * i;point.push({x: x,y: y,r: r});if (point.length == 3) {let 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);a[0].color = this.lineColor;this.bethelDraw(a, 1);point = [{x: x,y: y,r: r}];}}this.currentLine = line},//求两点之间距离distance(a, b) {let x = b.x - a.x;let y = b.y - a.y;return Math.sqrt(x * x + y * y);},ctaCalc(x0, y0, r0, x1, y1, r1, x2, y2, r2) {let a = [],vx01, vy01, norm, n_x0, n_y0, vx21, vy21, n_x2, n_y2;vx01 = x1 - x0;vy01 = y1 - y0;norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2;vx01 = vx01 / norm * r0;vy01 = vy01 / norm * r0;n_x0 = vy01;n_y0 = -vx01;vx21 = x1 - x2;vy21 = y1 - y2;norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2;vx21 = vx21 / norm * r2;vy21 = vy21 / norm * r2;n_x2 = -vy21;n_y2 = vx21;a.push({mx: x0 + n_x0,my: y0 + n_y0,color: "#1A1A1A"});a.push({c1x: x1 + n_x0,c1y: y1 + n_y0,c2x: x1 + n_x2,c2y: y1 + n_y2,ex: x2 + n_x2,ey: y2 + n_y2});a.push({c1x: x2 + n_x2 - vx21,c1y: y2 + n_y2 - vy21,c2x: x2 - n_x2 - vx21,c2y: y2 - n_y2 - vy21,ex: x2 - n_x2,ey: y2 - n_y2});a.push({c1x: x1 - n_x2,c1y: y1 - n_y2,c2x: x1 - n_x0,c2y: y1 - n_y0,ex: x0 - n_x0,ey: y0 - n_y0});a.push({c1x: x0 - n_x0 - vx01,c1y: y0 - n_y0 - vy01,c2x: x0 + n_x0 - vx01,c2y: y0 + n_y0 - vy01,ex: x0 + n_x0,ey: y0 + n_y0});a[0].mx = a[0].mx.toFixed(1);a[0].mx = parseFloat(a[0].mx);a[0].my = a[0].my.toFixed(1);a[0].my = parseFloat(a[0].my);for (let i = 1; i < a.length; i++) {a[i].c1x = a[i].c1x.toFixed(1);a[i].c1x = parseFloat(a[i].c1x);a[i].c1y = a[i].c1y.toFixed(1);a[i].c1y = parseFloat(a[i].c1y);a[i].c2x = a[i].c2x.toFixed(1);a[i].c2x = parseFloat(a[i].c2x);a[i].c2y = a[i].c2y.toFixed(1);a[i].c2y = parseFloat(a[i].c2y);a[i].ex = a[i].ex.toFixed(1);a[i].ex = parseFloat(a[i].ex);a[i].ey = a[i].ey.toFixed(1);a[i].ey = parseFloat(a[i].ey);}return a;},bethelDraw(point, is_fill, color) {let ctx = this.ctx;ctx.beginPath();ctx.moveTo(point[0].mx, point[0].my);if (undefined != color) {ctx.setFillStyle(color);ctx.setStrokeStyle(color);} else {ctx.setFillStyle(point[0].color);ctx.setStrokeStyle(point[0].color);}for (let i = 1; i < point.length; i++) {ctx.bezierCurveTo(point[i].c1x, point[i].c1y, point[i].c2x, point[i].c2y, point[i].ex, point[i].ey);}ctx.stroke();if (undefined != is_fill) {ctx.fill();}ctx.draw(true)},selectColorEvent(event) {var color = event.currentTarget.dataset.colorValue;var colorSelected = event.currentTarget.dataset.color;this.selectColor = colorSelected;this.lineColor = color;},setCanvasBg(color) {this.ctx.rect(0, 0, this.canvasWidth, this.canvasHeight - 4);this.ctx.setFillStyle(color)this.ctx.fill() //设置填充this.ctx.draw() //开画},},onShow() {}}
</script><style lang="scss" scoped>.canvas_wrapper {position: relative;background: #f8f7fc;border: 2px solid #EBEBEB;border-radius: 4px;margin: 0 auto;}.canvas_wrapper .handWriting {width: 100%;height: 100%;position: relative;z-index: 10;}.canvastips {position: absolute;top: 0;left: 0;width: 100%;height: 100%;z-index: 1;pointer-events: none;font-family: 'PingFang SC';font-style: normal;font-weight: 400;font-size: 70rpx;line-height: 180rpx;text-align: center;letter-spacing: 30rpx;color: #E6E6E6;}
</style>

vue3使用 由于是两个项目，操作也是不一样，所以获取图片的逻辑也有点不一样

<signatrue ref="signatrueRef" @confirmSign="confirmSign"></signatrue>

代码

<template><uni-popup ref="popup" type="bottom"><view class="page_container"><view class="canvas_title">请在这里签名</view><view class="canvas_wrapper" ref="canvas_wrappers"><canvas class="handWriting" disable-scroll="true" @touchstart="uploadScaleStart"@touchmove="uploadScaleMove" @touchend="uploadScaleEnd" canvas-id="handWriting"></canvas><view class="canvastips flex_center_center">请在这里签名</view></view><view class="zbutton_wrapper fixed_bottom"><view class="zbutton" @click="retDraw">重新签名</view><view class="zbutton black" @click="getCavasTempFile">完成签名并提交</view></view></view></uni-popup>
</template><script setup>import {ref,onMounted,computed,nextTick} from 'vue'let popup = ref(null)let state = ref({canvasName: 'handWriting',ctx: '',canvasWidth: 0,canvasHeight: 0,transparent: 1, // 透明度selectColor: 'black',lineColor: '#1a1a1a', // 颜色lineSize: 1.5, // 笔迹倍数lineMin: 0.5, // 最小笔画半径lineMax: 8, // 最大笔画半径pressure: 1, // 默认压力smoothness: 60, //顺滑度，用60的距离来计算速度currentPoint: {},currentLine: [], // 当前线条firstTouch: true, // 第一次触发radius: 1, //画圆的半径cutArea: {top: 0,right: 0,bottom: 0,left: 0}, //裁剪区域bethelPoint: [], //保存所有线条 生成的贝塞尔点；lastPoint: 0,chirography: [], //笔迹currentChirography: {}, //当前笔迹linePrack: [], //划线轨迹 , 生成线条的实际点half: 0 //绘制一半点})let canvasStyle = computed(() => {return `width:${state.value.widht};height:${state.value.height}`})onMounted(() => {// console.log(popup)})const init = () => {console.log('1111111111')popup.value.open('bottom');nextTick(() => {containerEnter()})}const containerEnter = () => {let canvasName = state.value.canvasNamelet ctx = uni.createCanvasContext(canvasName, this)state.value.ctx = ctx;var query = uni.createSelectorQuery().in(this);query.select('.canvas_wrapper').boundingClientRect(rect => {state.value.canvasWidth = rect.width;state.value.canvasHeight = rect.height;/* 将canvas背景设置为 白底，不设置  导出的canvas的背景为透明 */setCanvasBg('rgba(0,0,0,0)');}).exec();}const containerAfter = () => {retDraw()}// 获取临时文件const getCavasTempFile = (fn) => {// if (state.value.linePrack.length == 0 || state.value.linePrack[0].length <= 2) {// 	return state.value.$Tips({// 		title: '请签名'// 	})// }uni.canvasToTempFilePath({destWidth: 200,destHeight: 200,canvasId: 'handWriting',success: (res) => {//签名成功回调emits('confirmSign', res.tempFilePath)containerAfter()popup.value.close();},fail: (err) => {console.log('图片临时文件生成失败', err);}}, this)}// 笔迹开始const uploadScaleStart = (e) => {if (e.type != 'touchstart') return false;console.log('开始了');state.value.ctx.setFillStyle(state.value.lineColor); // 初始线条设置颜色state.value.ctx.setGlobalAlpha(state.value.transparent); // 设置半透明let currentPoint = {x: e.touches[0].x,y: e.touches[0].y}let currentLine = state.value.currentLine;currentLine.unshift({time: new Date().getTime(),dis: 0,x: currentPoint.x,y: currentPoint.y})state.value.currentPoint = currentPointif (state.value.firstTouch) {state.value.currentPoint = {top: currentPoint.y,right: currentPoint.x,bottom: currentPoint.y,left: currentPoint.x}state.value.firstTouch = false;}pointToLine(currentLine);}// 笔迹移动const uploadScaleMove = (e) => {state.value.half++;if ((state.value.half % 3) != 0) {return false}if (e.type != 'touchmove') return false;if (e.cancelable) {// 判断默认行为是否已经被禁用if (!e.defaultPrevented) {e.preventDefault();}}let point = {x: e.touches[0].x,y: e.touches[0].y}//测试裁剪if (point.y < state.value.cutArea.top) {state.value.cutArea.top = point.y;}if (point.y < 0) state.value.cutArea.top = 0;if (point.x > state.value.cutArea.right) {state.value.cutArea.right = point.x;}if (state.value.canvasWidth - point.x <= 0) {state.value.cutArea.right = state.value.canvasWidth;}if (point.y > state.value.cutArea.bottom) {state.value.cutArea.bottom = point.y;}if (state.value.canvasHeight - point.y <= 0) {state.value.cutArea.bottom = state.value.canvasHeight;}if (point.x < state.value.cutArea.left) {state.value.cutArea.left = point.x;}if (point.x < 0) state.value.cutArea.left = 0;state.value.lastPoint = state.value.currentPointstate.value.currentPoint = pointlet currentLine = state.value.currentLinecurrentLine.unshift({time: new Date().getTime(),dis: distance(state.value.currentPoint, state.value.lastPoint),x: point.x,y: point.y})pointToLine(currentLine);}// 笔迹结束const uploadScaleEnd = (e) => {console.log('结束了');if (e.type != 'touchend') return 0;let point = {x: e.changedTouches[0].x,y: e.changedTouches[0].y}state.value.lastPoint = state.value.currentPoint;state.value.currentPoint = point;let currentLine = state.value.currentLinecurrentLine.unshift({time: new Date().getTime(),dis: distance(state.value.currentPoint, state.value.lastPoint),x: point.x,y: point.y})if (currentLine.length > 2) {var info = (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length;//$("#info").text(info.toFixed(2));}//一笔结束，保存笔迹的坐标点，清空，当前笔迹//增加判断是否在手写区域；pointToLine(currentLine);var currentChirography = {lineSize: state.value.lineSize,lineColor: state.value.lineColor};var chirography = state.value.chirographychirography.unshift(currentChirography);state.value.chirography = chirographyvar linePrack = state.value.linePracklinePrack.unshift(state.value.currentLine);state.value.half = 0;state.value.linePrack = linePrack;state.value.currentLine = [];}const retDraw = () => {state.value.ctx.clearRect(0, 0, state.value.canvasWidth, state.value.canvasHeight)state.value.ctx.draw();//设置canvas背景setCanvasBg('rgba(0,0,0,0)');}//画两点之间的线条；参数为:line，会绘制最近的开始的两个点；const pointToLine = (line) => {calcBethelLine(line);return;}//计算插值的方式；const calcBethelLine = (line) => {if (line.length <= 1) {line[0].r = state.value.radius;return;}let x0, x1, x2, y0, y1, y2, r0, r1, r2, len, lastRadius, dis = 0,time = 0,curveValue = 0.5;if (line.length <= 2) {x0 = line[1].xy0 = line[1].yx2 = line[1].x + (line[0].x - line[1].x) * curveValue;y2 = line[1].y + (line[0].y - line[1].y) * curveValue;x1 = x0 + (x2 - x0) * curveValue;y1 = y0 + (y2 - y0) * curveValue;;} else {x0 = line[2].x + (line[1].x - line[2].x) * curveValue;y0 = line[2].y + (line[1].y - line[2].y) * curveValue;x1 = line[1].x;y1 = line[1].y;x2 = x1 + (line[0].x - x1) * curveValue;y2 = y1 + (line[0].y - y1) * curveValue;}//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len = distance({x: x2,y: y2}, {x: x0,y: y0});lastRadius = state.value.radius;for (let n = 0; n < line.length - 1; n++) {dis += line[n].dis;time += line[n].time - line[n + 1].time;if (dis > state.value.smoothness) break;}state.value.radius = Math.min(time / len * state.value.pressure + state.value.lineMin, state.value.lineMax) *state.value.lineSizeline[0].r = state.value.radius;//计算笔迹半径；if (line.length <= 2) {r0 = (lastRadius + state.value.radius) / 2;r1 = r0;r2 = r1;//return;} else {r0 = (line[2].r + line[1].r) / 2;r1 = line[1].r;r2 = (line[1].r + line[0].r) / 2;}let n = 5;let point = [];for (let i = 0; i < n; i++) {let t = i / (n - 1);let x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2;let y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2;let r = lastRadius + (state.value.radius - lastRadius) / n * i;point.push({x: x,y: y,r: r});if (point.length == 3) {let a = 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);a[0].color = state.value.lineColor;bethelDraw(a, 1);point = [{x: x,y: y,r: r}];}}state.value.currentLine = line}//求两点之间距离const distance = (a, b) => {let x = b.x - a.x;let y = b.y - a.y;return Math.sqrt(x * x + y * y);}const ctaCalc = (x0, y0, r0, x1, y1, r1, x2, y2, r2) => {let a = [],vx01, vy01, norm, n_x0, n_y0, vx21, vy21, n_x2, n_y2;vx01 = x1 - x0;vy01 = y1 - y0;norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2;vx01 = vx01 / norm * r0;vy01 = vy01 / norm * r0;n_x0 = vy01;n_y0 = -vx01;vx21 = x1 - x2;vy21 = y1 - y2;norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2;vx21 = vx21 / norm * r2;vy21 = vy21 / norm * r2;n_x2 = -vy21;n_y2 = vx21;a.push({mx: x0 + n_x0,my: y0 + n_y0,color: "#1A1A1A"});a.push({c1x: x1 + n_x0,c1y: y1 + n_y0,c2x: x1 + n_x2,c2y: y1 + n_y2,ex: x2 + n_x2,ey: y2 + n_y2});a.push({c1x: x2 + n_x2 - vx21,c1y: y2 + n_y2 - vy21,c2x: x2 - n_x2 - vx21,c2y: y2 - n_y2 - vy21,ex: x2 - n_x2,ey: y2 - n_y2});a.push({c1x: x1 - n_x2,c1y: y1 - n_y2,c2x: x1 - n_x0,c2y: y1 - n_y0,ex: x0 - n_x0,ey: y0 - n_y0});a.push({c1x: x0 - n_x0 - vx01,c1y: y0 - n_y0 - vy01,c2x: x0 + n_x0 - vx01,c2y: y0 + n_y0 - vy01,ex: x0 + n_x0,ey: y0 + n_y0});a[0].mx = a[0].mx.toFixed(1);a[0].mx = parseFloat(a[0].mx);a[0].my = a[0].my.toFixed(1);a[0].my = parseFloat(a[0].my);for (let i = 1; i < a.length; i++) {a[i].c1x = a[i].c1x.toFixed(1);a[i].c1x = parseFloat(a[i].c1x);a[i].c1y = a[i].c1y.toFixed(1);a[i].c1y = parseFloat(a[i].c1y);a[i].c2x = a[i].c2x.toFixed(1);a[i].c2x = parseFloat(a[i].c2x);a[i].c2y = a[i].c2y.toFixed(1);a[i].c2y = parseFloat(a[i].c2y);a[i].ex = a[i].ex.toFixed(1);a[i].ex = parseFloat(a[i].ex);a[i].ey = a[i].ey.toFixed(1);a[i].ey = parseFloat(a[i].ey);}return a;}const bethelDraw = (point, is_fill, color) => {let ctx = state.value.ctx;ctx.beginPath();ctx.moveTo(point[0].mx, point[0].my);if (undefined != color) {ctx.setFillStyle(color);ctx.setStrokeStyle(color);} else {ctx.setFillStyle(point[0].color);ctx.setStrokeStyle(point[0].color);}for (let i = 1; i < point.length; i++) {ctx.bezierCurveTo(point[i].c1x, point[i].c1y, point[i].c2x, point[i].c2y, point[i].ex, point[i].ey);}ctx.stroke();if (undefined != is_fill) {ctx.fill();}ctx.draw(true)}const selectColorEvent = (event) => {var color = event.currentTarget.dataset.colorValue;var colorSelected = event.currentTarget.dataset.color;state.value.selectColor = colorSelected;state.value.lineColor = color;}const setCanvasBg = (color) => {state.value.ctx.rect(0, 0, state.value.canvasWidth, state.value.canvasHeight - 4);// ctx.setFillStyle('red')state.value.ctx.setFillStyle(color)state.value.ctx.fill() //设置填充state.value.ctx.draw() //开画}const emits = defineEmits(['confirmSign'])defineExpose({init})
</script><style lang="scss" scoped>.page_container {height: calc(702rpx + 140rpx + 106rpx + env(safe-area-inset-bottom));background: #fff;}.canvas_wrapper {position: relative;width: 702rpx;height: 702rpx;background: #F6F6F6;border: 2px solid #EBEBEB;border-radius: 4px;margin: 0 auto;}.canvas_wrapper .handWriting {width: 100%;height: 100%;position: relative;z-index: 10;}.canvastips {position: absolute;top: 0;left: 0;width: 100%;height: 100%;z-index: 1;pointer-events: none;font-family: 'PingFang SC';font-style: normal;font-weight: 400;font-size: 70rpx;line-height: 180rpx;text-align: center;letter-spacing: 30rpx;color: #E6E6E6;/* transform: rotate(90deg); */}.canvas_title {height: 120rpx;padding: 0 32rpx;font-family: 'PingFang SC';font-style: normal;font-weight: 500;font-size: 36rpx;line-height: 120rpx;mix-blend-mode: normal;opacity: 0.9;}
</style>

本文来自互联网用户投稿，该文观点仅代表作者本人，不代表本站立场。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如若转载，请注明出处：http://www.rhkb.cn/news/188225.html

如若内容造成侵权/违法违规/事实不符，请联系长河编程网进行投诉反馈email:809451989@qq.com，一经查实，立即删除！

相关文章

【数据结构】C语言实现单链表万字详解(附完整运行代码)

【数据结构】C语言实现单链表万字详解(附完整运行代码)

&#x1f984;个人主页:修修修也 &#x1f38f;所属专栏:数据结构 ⚙️操作环境:Visual Studio 2022 一.了解项目功能 在本次项目中我们的目标是实现一个单链表: 该单链表使用动态内存分配空间,可以用来存储任意数量的同类型数据. 单链表结点(Node)需要包含两个要素:数据域data…
阅读更多...
Leetcode2834. 找出美丽数组的最小和

Leetcode2834. 找出美丽数组的最小和

Every day a Leetcode 题目来源&#xff1a;2834. 找出美丽数组的最小和 解法1&#xff1a;贪心 从最小正整数 1 开始枚举&#xff0c;设当前数为 num&#xff0c;如果 nums 里没有 target - num&#xff0c;就说明可以添加 num&#xff0c;依次填满直到有 n 个数即可。 用…
阅读更多...
【云栖2023】张治国：MaxCompute架构升级及开放性解读

【云栖2023】张治国：MaxCompute架构升级及开放性解读

简介&#xff1a; 本文根据2023云栖大会演讲实录整理而成&#xff0c;演讲信息如下 演讲人&#xff1a;张治国|阿里云智能计算平台研究员、阿里云MaxCompute负责人 演讲主题&#xff1a;MaxCompute架构升级及开放性解读 活动&#xff1a;2023云栖大会 MaxCompute发展经历了…
阅读更多...
“目标值排列匹配“和“背包组合问题“的区别和leetcode例题详解

“目标值排列匹配“和“背包组合问题“的区别和leetcode例题详解

1 目标值排列匹配 1.1 从目标字符串的角度来看&#xff0c;LC139是一个排列问题&#xff0c;因为最终目标子串的各个字符的顺序是固定的&#xff1f; 当我们从目标字符串 s 的角度来看 LC139 “单词拆分” 问题&#xff0c;确实可以认为它涉及到排列的概念&#xff0c;但这种…
阅读更多...
凯美瑞 vs 太空船：Web3 游戏生长的两条路径

凯美瑞 vs 太空船：Web3 游戏生长的两条路径

撰文&#xff1a;Teng Yan&#xff08;0xPrismatic&#xff09;&#xff0c;Delphi Digital 研究员 编译&#xff1a;TinTinLand 来源&#xff1a;https://0xprismatic.substack.com/p/my-short-web3-gaming-thesis 经常有人问我关于 Web3 游戏的看法&#xff0c;所以我想以这…
阅读更多...
思维模型 超限效应

思维模型 超限效应

本系列文章 主要是 分享 思维模型&#xff0c;涉及各个领域&#xff0c;重在提升认知。物极必反。 1 超限效应的应用 1.1 教育中的超限效应 一位老师在课堂上批评了一位学生&#xff0c;这位学生可能会因为老师的批评而感到沮丧和失落。如果老师在接下来的课程中继续批评这位…
阅读更多...
Android拖放startDragAndDrop拖拽Glide加载堆叠圆角图，Kotlin（5）

Android拖放startDragAndDrop拖拽Glide加载堆叠圆角图，Kotlin（5）

Android拖放startDragAndDrop拖拽Glide加载堆叠圆角图&#xff0c;Kotlin&#xff08;5&#xff09; import android.content.ClipData import android.graphics.Canvas import android.graphics.Point import android.os.Bundle import android.util.Log import android.view.…
阅读更多...
到底是什么是Python？语言的核心是什么？

到底是什么是Python？语言的核心是什么？

文章目录 前言一、为什么提出python编程的核心是什么&#xff1f;二、Python需要REPL&#xff1f;三、Python的哪些部分需要被视为“Python”&#xff1f;四、需要多少兼容性才能有用&#xff1f;Python技术资源分享1、Python所有方向的学习路线2、学习软件3、精品书籍4、入门学…
阅读更多...
SQL表、字段、查询参数获取

SQL表、字段、查询参数获取

SQL工具类表、字段、查询参数提取 1. 执行效果2. 使用2.1 引入依赖2.2 相关实体2.3 工具类 1. 执行效果 2. 使用 2.1 引入依赖 <!-- sql 解析处理--><dependency><groupId>com.github.jsqlparser</groupId><artifactId>jsqlparser</artifact…
阅读更多...
【教3妹学编程-算法题】2923. 找到冠军 I

【教3妹学编程-算法题】2923. 找到冠军 I

3妹&#xff1a;2哥2哥&#xff0c;你看到新闻了吗&#xff1f;襄阳健桥医院院长 公然“贩卖出生证明”&#xff0c; 真是太胆大包天了吧。 2哥 : 我也看到新闻了&#xff0c;7人被采取刑事强制措施。 就应该好好查查他们&#xff0c; 一查到底&#xff01; 3妹&#xff1a;真的…
阅读更多...
springboot定时服务

springboot定时服务

上一篇文章【修改定时时间&#xff0c;定时任务及时生效】 是定时任务与功能项目共用一个&#xff1b; 我目前所在公司的定时服务是专门有一个项目处理&#xff0c;然后定时查询库里面的定时信息配置。 话不多说&#xff0c;上程序 数据库设置 create table SCHEDULER_JOB…
阅读更多...
语音识别与自然语言处理（NLP）：技术前沿与未来趋势

语音识别与自然语言处理（NLP）：技术前沿与未来趋势

语音识别与自然语言处理&#xff08;NLP&#xff09;&#xff1a;技术前沿与未来趋势 随着科技的快速发展&#xff0c;语音识别与自然语言处理&#xff08;NLP&#xff09;技术逐渐成为人工智能领域的研究热点。这两项技术的结合&#xff0c;使得机器能够更好地理解和处理人类语…
阅读更多...
自主开发刷题应用网站H5源码（无需后端无需数据库）

自主开发刷题应用网站H5源码（无需后端无需数据库）

该应用使用JSON作为题库的存储方式&#xff0c;层次清晰、结构简单易懂。 配套的word模板和模板到JSON转换工具可供使用&#xff0c;方便将题库从word格式转换为JSON格式。 四种刷题模式包括顺序刷题、乱序刷题、错题模式和背题模式&#xff0c;可以根据自己的需求选择适合的模…
阅读更多...
arm2 day4

arm2 day4

汇编编写流水灯 代码&#xff1a; LED流水灯现象&#xff1a;
阅读更多...
浅谈高并发以及三大利器：缓存、限流和降级

浅谈高并发以及三大利器：缓存、限流和降级

引言 高并发背景 互联网行业迅速发展&#xff0c;用户量剧增&#xff0c;系统面临巨大的并发请求压力。 软件系统有三个追求&#xff1a;高性能、高并发、高可用&#xff0c;俗称三高。三者既有区别也有联系&#xff0c;门门道道很多&#xff0c;全面讨论需要三天三夜&#…
阅读更多...
掌动智能性能压力测试优势有哪些

掌动智能性能压力测试优势有哪些

企业通过自动化的测试工具模拟多种正常、峰值以及异常负载条件来对系统的各项性能指标进行测试。本文将介绍性能压力测试的价值及主要优势! 一、性能压力测试的价值 1、评估系统能力&#xff1a;有助于参数的基准测试&#xff0c;可以度量系统的响应时间;还有助于检查系统是否可…
阅读更多...
[工业自动化-12]：西门子S7-15xxx编程 - PLC从站 - ET200 SP系列详解

[工业自动化-12]：西门子S7-15xxx编程 - PLC从站 - ET200 SP系列详解

目录 一、概述 1.1 概述 二、系统组成 2.1 概述 2.2 与主站的通信接口模块 2.3 总线适配器 2.4 基座单元 2.5 电子模块 2.6 服务器模块 一、概述 1.1 概述 PLC ET200 SP 是西门子&#xff08;Siemens&#xff09;公司生产的一款模块化可编程逻辑控制器&#xff08;PL…
阅读更多...
Linux输入与输出设备的管理

Linux输入与输出设备的管理

计算机系统中CPU 并不直接和设备打交道&#xff0c;它们中间有一个叫作设备控制器&#xff08;Device Control Unit&#xff09;的组件&#xff0c;例如硬盘有磁盘控制器、USB 有 USB 控制器、显示器有视频控制器等。这些控制器就像代理商一样&#xff0c;它们知道如何应对硬盘…
阅读更多...
【MATLAB源码-第73期】基于matlab的OFDM-IM索引调制系统不同子载波数目误码率对比，对比OFDM系统。

【MATLAB源码-第73期】基于matlab的OFDM-IM索引调制系统不同子载波数目误码率对比，对比OFDM系统。

操作环境&#xff1a; MATLAB 2022a 1、算法描述 OFDM-IM索引调制技术是一种新型的无线通信技术&#xff0c;它将正交频分复用&#xff08;OFDM&#xff09;和索引调制&#xff08;IM&#xff09;相结合&#xff0c;以提高频谱效率和系统容量。OFDM-IM索引调制技术的基本思想…
阅读更多...
嵌入式养成计划-52----ARM--开发板介绍--相关硬件基础内容介绍--GPIO讲解

嵌入式养成计划-52----ARM--开发板介绍--相关硬件基础内容介绍--GPIO讲解

一百三十一、开发板介绍 131.1 核心板介绍 131.2 拓展板 一百三十二、相关硬件基础内容介绍 132.1 PCB PCB&#xff08; Printed Circuit Board&#xff09;&#xff0c;中文名称为印制电路板&#xff0c;又称印刷线路板&#xff0c; 是重要的电子部件&#xff0c;是电子元器…
阅读更多...
最新文章
推荐文章

Copyright @ 2022~2023

友情链接： 我的编程经验分享 一条长河网 尧图网站开发