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 How to get actual size of visual bitmap		  New Topic  Reply to Topic
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BionicWave

Germany
33 Posts
Posted - Jul 27 2011 :  16:55:09  Show Profile  Reply
Lets say you have a TImageEn Component, load it with a picture.
Lets Zoom in, so that you cannot see the whole picture.
How do i get to know the actual size of the bitmap in its zoomed state?
The original size of the picture is 256x256 pixels. In Zoomed state it is much bigger. I need to know the exact size in zoomed mode.

fab

1310 Posts
Posted - Jul 27 2011 :  22:39:08  Show Profile  Reply
It is difficult to know the exact size due math rounding problems.
This formula can only estimate the exact size:

width := trunc(ImageEn.IEBitmap.Width * ImageEn.Zoom / 100);
height := trunc(ImageEn.IEBitmap.Height * ImageEn.Zoom / 100);

While the exact size is (which can change of 0..1 from the estimated one):

width :=ImageEn.XBmp2Scr(ImageEn.IEBitmap.Width) - ImageEn.XBmp2Scr(0);
height := ImageEn.YBmp2Scr(ImageEn.IEBitmap.Height) - ImageEn.YBmp2Scr(0);
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