ScaleViewportExtEx

ScaleViewportExtEx

VB聲明

Declare Function ScaleViewportExtEx Lib "gdi32" Alias "ScaleViewportExtEx" (ByVal hdc As Long, ByVal nXnum As Long, ByVal nXdenom As Long, ByVal nYnum As Long, ByVal nYdenom As Long, lpSize As SIZE) As Long

說明

縮放設(shè)備場(chǎng)景視口的范圍

返回值

Long，執(zhí)行成功為非零值，失敗為0

參數(shù)表

參數(shù)

類型及說明

hdc

Long，設(shè)備場(chǎng)景句柄

nXnum,nYnum

Long，當(dāng)前X，Y范圍將與本數(shù)值相乘

nXdenom,nYdenom

Long，當(dāng)前X，Y范圍將被本數(shù)值除

lpSize

SIZE，裝載原有水平和垂直視口范圍的結(jié)構(gòu)

注解

本函數(shù)僅在MM_ISOTROPIC 和 MM_ANISOTROPIC映射模式下有效，在MM_ISOTROPIC模式，要在設(shè)置視口范圍之前設(shè)置窗口范圍

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