本文实例讲述了jQuery+canvas实现的球体平抛及颜色动态变换效果。分享给大家供大家参考,具体如下:
运行效果截图如下:
具体代码如下:
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"> <html xmlns=\"http://www.w3.org/1999/xhtml\"> <head> <title>canvas平抛</title> <script src=\"jquery-1.7.1.min.js\" type=\"text/javascript\"></script> <script type=\"text/javascript\" > var canvasHeight = 300; var canvasWidth = 300; var g = 9.8; //x, y, vo, r function HorizenCast(context, settings) { var _self = this; $.extend(_self, settings); _self.xo = _self.x; _self.yo = _self.y; HorizenCast.createColor = function () { var r = Math.round(Math.random() * 256), g = Math.round(Math.random() * 256), b = Math.round(Math.random() * 256); return \"rgb(\"+r+\",\"+g+\",\"+b+\")\"; } _self.cast = function () { if (_self.x > canvasWidth - _self.r || _self.y > canvasHeight - _self.r) { return; } var time = (new Date().getTime() - _self.prevTime) / 1000, x = _self.xo +_self.vo * time, y = _self.yo + 1 / 2 * g * time * time; context.beginPath(); context.fillStyle = HorizenCast.createColor(); context.arc(_self.x, _self.y, _self.r, 0, 2 * Math.PI); context.fill(); context.closePath(); _self.x = x; _self.y = y; setTimeout(function () { _self.cast(); }, 30); } _self.prevTime = new Date().getTime(); _self.cast(); } $(document).ready(function () { var canvas = document.getElementById(\"canvas\"); var context = canvas.getContext(\'2d\'); new HorizenCast(context, { x: 0, y: 0, vo: 100, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 90, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 80, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 70, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 60, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 50, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 40, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 30, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 20, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 10, r: 5 }); new HorizenCast(context, { x: 0, y: 0, vo: 5, r: 5 }); }); </script> <style type=\"text/css\" > h2 { color:Gray; line-height:50px; } #canvas { background:#DDDDDD;} </style> </head> <body> <center> <h3>canvas实现平抛效果</h3> <hr /> <canvas id=\"canvas\" width=\"300\" height=\"300\"></canvas> <hr /> </center> </body> </html>
更多关于jQuery相关内容感兴趣的读者可查看本站专题:《jQuery动画与特效用法总结》及《jQuery常见经典特效汇总》
希望本文所述对大家jQuery程序设计有所帮助。
本文地址:https://www.stayed.cn/item/26052
转载请注明出处。
本站部分内容来源于网络,如侵犯到您的权益,请 联系我