上样式生成函数代码
lineStyle (x1, y1, x2, y2, lineWidth = 4, color = ‘black‘) { ???let rectX = x1 < x2 ? x1 : x2; ???let rectY = y1 < y2 ? y1 : y2; ???let rectWidth = Math.abs(x1 - x2); ???let rectHeight = Math.abs(y1 - y2); ???//弦长 ???let stringWidth = Math.ceil(Math.sqrt((rectWidth * rectWidth) + (rectHeight * rectHeight))); ???let xPad = (rectWidth - stringWidth) / 2; ???let yPad = (rectHeight - lineWidth) / 2; ???let radNum = Math.atan2((y1 - y2), (x1 - x2)); ???return ` ???????position: absolute; ???????width: ${ stringWidth }px; ???????height: ${ lineWidth }px; ???????background-color: ${ color }; ???????transform: translate(${ rectX + xPad }px, ${ rectY + yPad }px) rotate(${ radNum }rad); ???`;},传入两坐标点，利用div+css画线
原文地址：https://www.cnblogs.com/jimaojin/p/10101249.html