457 lines
18 KiB
Vue
457 lines
18 KiB
Vue
|
<template>
|
|||
|
|
<view class="cu-dialog">
|
|||
|
|
<view class="cu-bar bg-white justify-end">
|
|||
|
|
<view class="content">签名</view>
|
|||
|
|
<view class="action" @tap="_cancel">
|
|||
|
|
<text class="cuIcon-close text-red"></text>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
<view>
|
|||
|
|
<view class="wrapper">
|
|||
|
|
<view class="handCenter">
|
|||
|
|
<canvas
|
|||
|
|
class="handWriting"
|
|||
|
|
:disable-scroll="true"
|
|||
|
|
@touchstart="uploadScaleStart"
|
|||
|
|
@touchmove="uploadScaleMove"
|
|||
|
|
@touchend="uploadScaleEnd"
|
|||
|
|
canvas-id="handWriting"
|
|||
|
|
></canvas>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
<view class="cu-bar bg-white justify-end">
|
|||
|
|
<view class="action">
|
|||
|
|
<button class="cu-btn line-green text-green" @click="retDraw">重写</button>
|
|||
|
|
<button class="cu-btn bg-green margin-left" @click="confirm" >完成</button>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
</template>
|
|||
|
|
|
|||
|
|
<script>
|
|||
|
|
export default {
|
|||
|
|
props: {
|
|||
|
|
imgList: {
|
|||
|
|
type: Array,
|
|||
|
|
default: function () {
|
|||
|
|
return []
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
data() {
|
|||
|
|
return {
|
|||
|
|
//手写板
|
|||
|
|
canvasName: 'handWriting',
|
|||
|
|
ctx: '',
|
|||
|
|
canvasWidth: 0,
|
|||
|
|
canvasHeight: 0,
|
|||
|
|
transparent: 1, // 透明度
|
|||
|
|
selectColor: 'black',
|
|||
|
|
lineColor: '#1A1A1A', // 颜色
|
|||
|
|
lineSize: 1.5, // 笔记倍数
|
|||
|
|
lineMin: 0.5, // 最小笔画半径
|
|||
|
|
lineMax: 4, // 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
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
created(){
|
|||
|
|
//手写板
|
|||
|
|
let canvasName = this.canvasName;
|
|||
|
|
let ctx = uni.createCanvasContext(canvasName);
|
|||
|
|
|
|||
|
|
this.ctx = ctx;
|
|||
|
|
var query = uni.createSelectorQuery();
|
|||
|
|
query
|
|||
|
|
.select('.handCenter')
|
|||
|
|
.boundingClientRect(rect => {
|
|||
|
|
if (rect) {
|
|||
|
|
if (rect.width) this.canvasWidth = rect.width;
|
|||
|
|
if (rect.height) 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('#fff');
|
|||
|
|
})
|
|||
|
|
.exec();
|
|||
|
|
},
|
|||
|
|
methods: {
|
|||
|
|
// 笔迹开始
|
|||
|
|
uploadScaleStart(e) {
|
|||
|
|
if (e.type != 'touchstart') return false;
|
|||
|
|
let ctx = this.ctx;
|
|||
|
|
ctx.setFillStyle(this.lineColor); // 初始线条设置颜色
|
|||
|
|
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 = currentPoint;
|
|||
|
|
// currentLine
|
|||
|
|
if (this.firstTouch) {
|
|||
|
|
this.cutArea = { top: currentPoint.y, right: currentPoint.x, bottom: currentPoint.y, left: currentPoint.x };
|
|||
|
|
this.firstTouch = false;
|
|||
|
|
}
|
|||
|
|
this.pointToLine(currentLine);
|
|||
|
|
},
|
|||
|
|
// 笔迹移动
|
|||
|
|
uploadScaleMove(e) {
|
|||
|
|
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.currentPoint;
|
|||
|
|
this.currentPoint = point;
|
|||
|
|
|
|||
|
|
let currentLine = this.currentLine;
|
|||
|
|
currentLine.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.currentLine;
|
|||
|
|
currentLine.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.chirography;
|
|||
|
|
chirography.unshift(currentChirography);
|
|||
|
|
this.chirography = chirography;
|
|||
|
|
|
|||
|
|
var linePrack = this.linePrack;
|
|||
|
|
linePrack.unshift(this.currentLine);
|
|||
|
|
this.linePrack = linePrack;
|
|||
|
|
this.currentLine = [];
|
|||
|
|
},
|
|||
|
|
retDraw() {
|
|||
|
|
this.ctx.clearRect(0, 0, 700, 730);
|
|||
|
|
this.ctx.draw();
|
|||
|
|
|
|||
|
|
//设置canvas背景
|
|||
|
|
this.setCanvasBg('#fff');
|
|||
|
|
},
|
|||
|
|
//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].x;
|
|||
|
|
y0 = line[1].y;
|
|||
|
|
x2 = line[1].x + (line[0].x - line[1].x) * curveValue;
|
|||
|
|
y2 = line[1].y + (line[0].y - line[1].y) * curveValue;
|
|||
|
|
//x2 = line[1].x;
|
|||
|
|
//y2 = line[1].y;
|
|||
|
|
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.lineSize;
|
|||
|
|
line[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;
|
|||
|
|
// let bethelPoint = this.bethelPoint;
|
|||
|
|
// bethelPoint = bethelPoint.push(a);
|
|||
|
|
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(); //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 )
|
|||
|
|
}
|
|||
|
|
ctx.draw(true);
|
|||
|
|
},
|
|||
|
|
selectColorEvent(str,color) {
|
|||
|
|
this.selectColor = str;
|
|||
|
|
this.lineColor = color;
|
|||
|
|
},
|
|||
|
|
//完成
|
|||
|
|
confirm() {
|
|||
|
|
var _this = this;
|
|||
|
|
let img={};
|
|||
|
|
this.ctx.draw(true, () => {
|
|||
|
|
uni.canvasToTempFilePath({
|
|||
|
|
canvasId: 'handWriting',
|
|||
|
|
fileType: 'jpg',
|
|||
|
|
quality: 1, //图片质量
|
|||
|
|
destWidth:900,
|
|||
|
|
destHeight:435,
|
|||
|
|
success(res) {
|
|||
|
|
img.id='';
|
|||
|
|
img.filePath=res.tempFilePath;
|
|||
|
|
_this.retDraw();
|
|||
|
|
_this.$emit("confirm", img);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
});
|
|||
|
|
},
|
|||
|
|
//保存到相册
|
|||
|
|
saveCanvasAsImg() {
|
|||
|
|
uni.canvasToTempFilePath({
|
|||
|
|
canvasId: 'handWriting',
|
|||
|
|
fileType: 'png',
|
|||
|
|
quality: 1, //图片质量
|
|||
|
|
success(res) {
|
|||
|
|
// console.log(res.tempFilePath, 'canvas生成图片地址');
|
|||
|
|
uni.saveImageToPhotosAlbum({
|
|||
|
|
filePath: res.tempFilePath,
|
|||
|
|
success(res) {
|
|||
|
|
uni.showToast({
|
|||
|
|
title: '已保存到相册',
|
|||
|
|
duration: 2000
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
},
|
|||
|
|
//设置canvas背景色 不设置 导出的canvas的背景为透明
|
|||
|
|
//@params：字符串 color
|
|||
|
|
setCanvasBg(color) {
|
|||
|
|
|
|||
|
|
/* 将canvas背景设置为 白底，不设置 导出的canvas的背景为透明 */
|
|||
|
|
//rect() 参数说明 矩形路径左上角的横坐标，左上角的纵坐标, 矩形路径的宽度, 矩形路径的高度
|
|||
|
|
//这里是 canvasHeight - 4 是因为下边盖住边框了，所以手动减了写
|
|||
|
|
this.ctx.rect(0, 0, this.canvasWidth, this.canvasHeight - 4);
|
|||
|
|
// ctx.setFillStyle('red')
|
|||
|
|
this.ctx.setFillStyle(color);
|
|||
|
|
this.ctx.fill(); //设置填充
|
|||
|
|
this.ctx.draw(); //开画
|
|||
|
|
},
|
|||
|
|
_cancel() {
|
|||
|
|
this.$emit("cancel", '');
|
|||
|
|
},
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
<style scoped>
|
|||
|
|
.wrapper {
|
|||
|
|
width: 100%;
|
|||
|
|
height: 24vh;
|
|||
|
|
margin: 0;
|
|||
|
|
overflow: hidden;
|
|||
|
|
display: flex;
|
|||
|
|
align-content: center;
|
|||
|
|
flex-direction: row;
|
|||
|
|
justify-content: center;
|
|||
|
|
font-size: 28rpx;
|
|||
|
|
}
|
|||
|
|
.handWriting {
|
|||
|
|
background: #fff;
|
|||
|
|
width: 100%;
|
|||
|
|
height: 100%;
|
|||
|
|
}
|
|||
|
|
.handCenter {
|
|||
|
|
border: 4rpx dashed #e9e9e9;
|
|||
|
|
flex: 5;
|
|||
|
|
overflow: hidden;
|
|||
|
|
box-sizing: border-box;
|
|||
|
|
}
|
|||
|
|
</style>
|