HOW TO: Convert from Client to Bitmap Coordinates with the LBitmapWindow Class

#1 Posted : Wednesday, June 9, 2010 6:20:54 AM(UTC)

GregR

Groups: Registered, Tech Support, Administrators
Posts: 764

Here's a C++ code snippet of how to convert a point in client coordinates to bitmap coordinates with the 16.5 C++ Class Library interface's LBitmapWindow class. LMyBitmapWindow is an inherited class of LBitmapWindow.

POINT LMyBitmapWindow::ClientToBitmap(POINT ptClient)
{
    POINT ptBitmap;
    CRect Dst;
    GetRects(NULL, NULL, &Dst, NULL);

    ptBitmap.x = (ptClient.x - Dst.left) * GetWidth() / Dst.Width();
    ptBitmap.y = (ptClient.y - Dst.top) * GetHeight() / Dst.Height();

    return ptBitmap;
}

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HOW TO: Convert from Client to Bitmap Coordinates with the LBitmapWindow Class