zzuhan

/**
 * - chrome为了安全考虑，设计的不支持js操作加入收藏夹，
 * - 火狐23之后开始废止window.sidebar因为不是w3c标注 https://bugzilla.mozilla.org/show_bug.cgi?id=691647
 * - document.all 判断IE不够靠谱，因为现在许多浏览器也实现了document.all吗，并且IE11以后(document.all)为falsy
 * - 参考 http://stackoverflow.com/questions/10033215/add-to-favorites-button
 * - IE 中typeof window.external.addFavorite 为'unknown' [http://www.xdarui.com/archives/203.html];
 */
var url = 'https://gist.github.com/',
    title = 'gist代码片段';

zhangolve

html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

CoderJackLiu

//圆角
float2 UV = uvs;
float PixelRange = min(min(SizeX/2,SizeY/2),Range);

//当前绘制的像素
float2 CurrentP = float2(UV.x*SizeX,UV.y*SizeY);

//像素坐标参照点
//float2 MiddleP=float2(0.5*SizeX,0.5*SizeY);