画图API的应用,线,圆等
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="description" content="canvas画简单电路图 by hovertree.com" /> </head> <body> <canvas id="canHewenqi" width="500" height="300" style="margin: 20px auto"></canvas> <script> var canvas = document.getElementById("canHewenqi"); var cxt = canvas.getContext("2d"); cxt.moveTo(10,10); cxt.lineTo(100,10); cxt.stroke(); cxt.beginPath(); cxt.moveTo(100,10); cxt.lineTo(100,0); cxt.lineTo(150,0); cxt.lineTo(150,20); cxt.lineTo(100,20); cxt.closePath(); cxt.moveTo(150,10); cxt.lineTo(250,10); cxt.lineTo(250,100); cxt.stroke(); cxt.moveTo(225,100); cxt.lineTo(275,100); cxt.stroke(); cxt.moveTo(225,115); cxt.lineTo(275,115); cxt.stroke(); cxt.moveTo(250,115); cxt.lineTo(250,160); cxt.stroke(); cxt.moveTo(250,160); cxt.lineTo(150,160); cxt.stroke(); cxt.arc(130,160,20,0,360,false); cxt.stroke(); cxt.moveTo(150,160); cxt.lineTo(10,160); cxt.lineTo(10,10); cxt.stroke(); </script> </body> </html>