恶灵挽歌的专栏

[size=medium]android绘图中使用的矩阵是3x3的结构。[/size][img]http://www.moandroid.com/wp-content/uploads/2010/04/3-x-3.JPG[/img][size=medium]矩阵元素的功能：[/size][img]http://www.moandroid.com/wp-content/uplo...

[size=medium]计算画布中两点的距离[/size][code="java"]float fLen = (float)Math.sqrt(Math.pow(points.get(0).x - points.get(1).x, 2) +Math.pow(points.get(0).y - points.get(1).y, 2));[/code]...