2025年PB像素转pbu的两种方法

科技前沿 • 2025-03-22 14:09 • 阅读 21

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像素转pbu的两种方法:

/一、像素转pbu的计算方法
int ConvertPBU(int nValue, int nType)
{
   static int tmHeight = 0;
   static int tmAveCharWidth = 0;
   static int nLogPixelsX = 0;
   static int nLogPixelsY = 0;

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   if (!tmHeight && !tmAveCharWidth)
   {
       HWND hWnd = GetDesktopWindow();
       HDC hdc = SysGetDC(hWnd);
       HFONT hFont = (HFONT)GetStockObject(SYSTEM_FONT);
       HFONT hOldFont = (HFONT)SelectObject(hdc, hFont);
       TEXTMETRIC tm;
       GetTextMetrics(hdc, &tm);
       tmHeight = tm.tmHeight;
       tmAveCharWidth = tm.tmAveCharWidth;
       nLogPixelsX = GetDeviceCaps(hdc, LOGPIXELSX);
       nLogPixelsY = GetDeviceCaps(hdc, LOGPIXELSY);
       SelectObject(hdc, hOldFont);
       SysReleaseDC(hWnd, hdc);
   }
   int result = 0;
   switch (nType)
   {
   case 1:
   {
       int n = nLogPixelsX;
       if (nValue < 0)
           n = -nLogPixelsX;
       result = (6144 * nValue + 7 * n) / (14 * nLogPixelsX);
   }
   break;
   case 2:
   {
       int n = nLogPixelsY;
       if (nValue < 0)
           n = -nLogPixelsY;
       result = (n + 768 * nValue) / (2 * nLogPixelsY);
   }
   break;
   case 3:
       result = ((nValue >= 0 ? 1536 : -1536) + 7 * nValue * nLogPixelsX) / 3072;
       break;
   case 4:
       result = ((nValue >= 0 ? 192 : -192) + nValue * nLogPixelsY) / 384;
       break;
   default:
       result = 0;
       break;
   }
   return result;
}

//二、直接调用PBVMxxx.dll 法
function long FN_ConvertUnits(long unitsORpixels, long type) library "pbvmxxx.dll" //这里的DLL，根据具体自己写，比如 PB9就是 pbvm90.dll,PB12.5就是 pbvm125.dll
参数说明:
1.long unitsORpixels 像素或PBU值
2.long type，转换类型。分别可以是:
int PixelsToUnitsX(int nPixels)
{
   return FN_ConvertUnits(nPixels, 1);
}
int PixelsToUnitsY(int nPixels)
{
   return FN_ConvertUnits(nPixels, 2);
}
int UnitsToPixelsX(int nUnites)
{
   return FN_ConvertUnits(nUnites, 3);
}
int UnitsToPixelsY(int nUnites)
{
   return FN_ConvertUnits(nUnites, 4);
}

2025年PB像素转pbu的两种方法

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