| Re: Object Graphics fonts [message #39801 is a reply to message #39729] |
Thu, 10 June 2004 09:01   |
Michael Wallace
Messages: 409
Registered: December 2003
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Senior Member |
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> The explanation is that the devices have different resolutions:
>
> IDL does its best to draw the glyphs at the requested size. A common size
> is 12 points and that does not mean 12 pixels, although on most displays the
> size of a pixel is pretty close to a point (1/72nd of an inch). IDL uses
> the device resolution (size of a pixel) to decide how many pixels to use to
> draw the glyphs. If the resolutions are different, then the number of
> pixels used will be different, in order to get the same physical size.
Oh, I get it now. No matter how long I work in this profession, it
seems I always have to relearn that points != pixels, although usually
points ~= pixels. For some reason, my little ol' head just can't seem
to remember details like this. Maybe it's because I only try to call up
that knowledge when I need it, which is not very often.
> If your window pixel size is smaller than the buffer pixel size, as is the
> case above, then it would take more pixels to draw the same size glyph.
> That's why the text looked better in the window.
Yep, my window pixel size was smaller. Okay, this mystery is solved, at
least for me. I don't know if anyone else got anything out of this
discussion, but I feel better knowing that I can move one IDL nuance
from the "mystery" pile to the "makes sense" pile. :-)
-Mike
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