用户需在APP
或小程序
使用手写的方式签字或签名vue
(推荐)
index.vue
<!-- canvas -->
<canvas class="mycanvas" canvas-id="mycanvas" @touchstart="touchstart" @touchmove="touchmove" @touchend="touchend"></canvas>
<!-- 底部操做按钮 -->
<view class="footer">
<view class="left" @click="finish">保存</view>
<view class="right" @click="clear">清除</view>
<view class="close" @click="close">关闭</view>
</view>
<view @click='createCanvas()'>点击触发写字板</view>
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上面的canvas
共绑定了3个方法canvas
方法名 | 方法解读 |
---|---|
@touchstart | 手写触摸开始,获取到起点 |
@touchmove | 手写触摸移动,获取到路径点 |
@touchend | 手写触摸结束 |
export default {
data() {
return {
//绘图图像
ctx: '',
//路径点集合
points: [],
//签名图片
SignatureImg: ''
}
}
}
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该方法主要是建立了画布
触摸开始,获取到起点
触摸移动,获取到路径点
触摸结束,将未绘制的点清空防止对后续路径产生干扰
绘制笔迹
清空画布
完成绘画并保存到本地
methods: {
createCanvas() {
//建立绘图对象
this.ctx = uni.createCanvasContext('mycanvas', this);
//设置画笔样式
this.ctx.lineWidth = 4;
this.ctx.lineCap = 'round';
this.ctx.lineJoin = 'round';
},
touchstart(e) {
let startX = e.changedTouches[0].x;
let startY = e.changedTouches[0].y;
let startPoint = { X: startX, Y: startY };
this.points.push(startPoint);
//每次触摸开始,开启新的路径
this.ctx.beginPath();
},
touchmove(e) {
let moveX = e.changedTouches[0].x;
let moveY = e.changedTouches[0].y;
let movePoint = { X: moveX, Y: moveY };
this.points.push(movePoint); //存点
let len = this.points.length;
if (len >= 2) {
this.draw(); //绘制路径
}
},
touchend() {
this.points = [];
},
draw() {
let point1 = this.points[0];
let point2 = this.points[1];
this.points.shift();
this.ctx.moveTo(point1.X, point1.Y);
this.ctx.lineTo(point2.X, point2.Y);
this.ctx.stroke();
this.ctx.draw(true);
},
clear() {
let that = this;
uni.getSystemInfo({
success: function(res) {
let canvasw = res.windowWidth;
let canvash = res.windowHeight;
that.ctx.clearRect(0, 0, canvasw, canvash);
that.ctx.draw(true);
}
});
},
finish() {
let that = this;
uni.canvasToTempFilePath({
canvasId: 'mycanvas',
success: function(res) {
//这里的res.tempFilePath就是生成的签字图片
console.log(res.tempFilePath);
}
});
}
}
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上面finish()
方法获得的res.tempFilePath
就是生成出来的签名,可用于作余下的业务操做小程序