签章 html
<template>
<div>
<canvas id="canvas" width="200" height="200"></canvas>
</div>
</template>
<script>
import chapter from './config/chapter'
export default {
mounted(){
chapter('XXX专用章','XXX科技股份有限公司')
}
}
</script>
签章-JS封装
let chapter = (text, companyName) => {
let canvas = document.getElementById("canvas");
let context = canvas.getContext("2d");
//let text = "XXX专用章";
//let companyName = "XXX科技股份有限公司";
// 绘制印章边框
let width = canvas.width / 2;
let height = canvas.height / 2;
context.lineWidth = 5;
context.strokeStyle = "#f00";
context.beginPath();
context.arc(width, height, 90, 0, Math.PI * 2); //宽、高、半径
context.stroke();
//画五角星
create5star(context, width, height, 25, "#f00", 0);
// 绘制印章名称
context.font = "20px 宋体";
context.textBaseline = "middle"; //设置文本的垂直对齐方式
context.textAlign = "center"; //设置文本的水平对对齐方式
context.lineWidth = 1;
context.strokeStyle = "#f00";
context.strokeText(text, width, height + 60);
// 绘制印章单位
context.translate(width, height); // 平移到此位置,
context.font = "23px 宋体";
let count = companyName.length; // 字数
let angle = (4 * Math.PI) / (3 * (count - 1)); // 字间角度
let chars = companyName.split("");
let c;
for (let i = 0; i < count; i++) {
c = chars[i]; // 需要绘制的字符
if (i == 0) {
context.rotate((5 * Math.PI) / 6);
} else {
context.rotate(angle);
}
context.save();
context.translate(70, 0); // 平移到此位置,此时字和x轴垂直，公司名称和最外圈的距离
context.rotate(Math.PI / 2); // 旋转90度,让字平行于x轴
context.strokeText(c, 0, 0); // 此点为字的中心点
context.restore();
}
//绘制五角星
function create5star(context, sx, sy, radius, color, rotato) {
context.save();
context.fillStyle = color;
context.translate(sx, sy); //移动坐标原点
context.rotate(Math.PI + rotato); //旋转
context.beginPath(); //创建路径
// let x = Math.sin(0);
// let y = Math.cos(0);
let dig = (Math.PI / 5) * 4;
for (let i = 0; i < 5; i++) {
//画五角星的五条边
let x = Math.sin(i * dig);
let y = Math.cos(i * dig);
context.lineTo(x * radius, y * radius);
}
context.closePath();
context.stroke();
context.fill();
context.restore();
}
}
export default chapter;
