绘制半透明位图及如何画透明位图 有的时侯，我们希望显示一幅半透明的位图。也就是说我们将一幅位图B 显示到A位图上，又希望透过B位图看到A位图的一部分图像但不是全部。比如A位 图是一幅曲线图，B是一幅提示位图，我们想在显示提示的同时看到已显示的曲 线，但不需要曲线的背景 ，就需有用到半透明位图。曲线看上去就象从B位图中渗 透过来，其实半透明技术就是一种渗透技术，渗透公式我们可选用多种，在这里 我们选用（A AND 0x7F）OR B。注意，白色不能产生渗透。-rendering translucent bitmaps and how transparent bitmap painting some slim, we hope to show a translucent bitmaps. That is to say we will be a bit Figure B shows that the A bitmap, and they hope to see Figure B A part of the bitmap images, but not all. For example, A bitmap is a curve, B is a Bitmap suggest, we would like to suggest the show has been seen at the same time show the curve, but it does not need curve background on the need for useful to translucent bitmaps. From the curve looks like B infiltrate map, in fact technology is a translucent infiltration, infiltration formula we can use multiple, and here we choose (A AND which) OR B. Note that not produce white infiltration.