js按住鼠标绘制线条代码实例
分类:实例代码
分享一段代码实例,它实现了按住鼠标然后移动能够绘制线条的功能。
这个线条可以是随意的形状,代码实例如下:
<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="author" content="http://www.pipipi.net/" /> <title>前端教程网</title> <style> body{ margin:0; padding:0; overflow:hidden; } #canvas { background: #000; } </style> <script> window.onload = function() { var myCanvas = document.getElementById("canvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; var ext = myCanvas.getContext("2d"); //2d绘图对象 myCanvas.onmousedown = function(e) { var e = e || window.e; ext.beginPath(); ext.moveTo(e.clientX - myCanvas.offsetLeft, e.clientY - myCanvas.offsetTop); document.onmousemove = function(e) { var e = e || window.e; ext.lineTo(e.clientX - myCanvas.offsetLeft, e.clientY - myCanvas.offsetTop); ext.stroke(); //链接起始点和终结点 ext.strokeStyle = "blue"; //笔触的颜色 }; document.onmouseup = function() { document.onmousemove = null; document.onmouseup = null; } } } </script> </head> <body> <canvas id="canvas"></canvas> </body> </html>
js按住鼠标绘制线条代码实例,这样的场景在实际项目中还是用的比较多的,关于js按住鼠标绘制线条代码实例就介绍到这了。
js按住鼠标绘制线条代码实例属于前端实例代码,有关更多实例代码大家可以查看。