[新闻] 今天才知道，原来PSV屏幕的PPI还没有3DS高。

Theoretically, PPI can be calculated from knowing the diagonal size of the screen in inches and the resolution in pixels (width and height). This can be done in two steps:
1. Calculate diagonal resolution in pixels using the Pythagorean theorem:

2. Calculate PPI:

where
dp is diagonal resolution in pixels,
wp is width resolution in pixels,
hp is height resolution in pixels and
di is diagonal size in inches. (This is the number advertised as the size of the display.)

[ 本帖最后由 mushroom 于 2012-2-13 13:34 编辑 ]