我在VC ++ GDI中遇到mapemode问题 [英] I have problems with the mapemode in VC++ GDI

问题描述

SetWindowExtEx () ;
SetViewportExtEx () ;
SetWindowOrgEx () ;
SetViewportOrgEx () ;

1.模式的y轴MM_TEXT来自顶部向下，而MM_ISOTROPIC则相反。所以我有一个问题，上面描述的y轴取向是指页面空间或设备或两者兼而有之？



2.SetWindowExtEx（），SetViewportExtEx（），can不仅要设置x轴和y轴的延伸，还要设置x和y方向。之后如何将页面坐标转换为设备坐标？象限mapps怎么样？这让我很困惑。



有人可以帮我解释一下吗？或者张贴说明两个坐标关系的图片？





PS：

我的英语很差，我的错

1. the y axis of mode MM_TEXT is from top to down,and that of MM_ISOTROPIC is opposite. so i have a question ,the y axis oriention described above is refer to the page space or device or both ?

2.SetWindowExtEx (),SetViewportExtEx (),can not only set extention for both x axis and y axis ,but also set the x and y oriention .how the to page coordinate translation into device coordinate after that ? And how the quadrant mapps ? That really confused me .

Can someone explain it for me ? Or post a picture illustrating the two coordinates relations ?


PS:
my english is poor ,my fault

推荐答案

我知道它很混乱，但你应该学习坐标空间和转换 [ ^ ]，它可能以您自己的语言提供。

I know it is rather confusing but you should study Coordinate Spaces and Transformations[^], and it may well be available in your own language.

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