John Labenski <jlaben...@gmail.com> wrote:
(06/03/2009 03:06)
>
>On Wed, Mar 4, 2009 at 4:01 AM, lostgallifreyan
><lostgallifre...@gmail.com> wrote:
>>>
>>>I would load the original as a wxImage and convert it to a wxBitmap
>>>for drawing, saving both of these. If the zoom changes, use the
>>>wxImage functions to rescale into the same wxBimap and use this to
>>>draw into your DC. That way your wxBitmap is ready to go when it comes
>>>time to paint. If you plan to zoom way in or the image is huge you may
>>>want to crop the wxImage to a temporary wxImage of the size and
>>>position of the scrolled window before scaling it, then create the
>>>wxBitmap for drawing, but note that you will have to do this in real
>>>time for scrolling.
>>>
>>
>> Nice, I'll try it. It's close to what I had in mind too.The bit about
>> 'saving' both the wxImage and wxBitmap puzzles me though, you mean to file
>> on disk, or to a holding variable at runtime? (I guess latter). Also, if I
>> opt for a crude pixel resize, is there a way that doesn't need to use the
>> wxImage? (Pixel resize is fast, and adequate for this, probably.) I'll still
>> likely use the wxImage though, because the image IS huge, I'll definitely
>> want to crop it if it works fast. (1.2 GHz ITX board, running W98 SE).
>>
>
>Both the original unscaled and uncropped wxImage and the
>scaled/cropped wxBitmap are in memory.
I still don't understand.. Unless you mean keeping them there, by assigning
them to variables as I mentioned before deleting a DC. ('Saving' to most
people, means to disk).
>You can also try using
>wxDC::SetUserScale() IIRC.
Nice, but it looked vile at half-scale. :) And moved like crystallised
molasses, and wouldn't show at all at 2x. I think I'll crop and do bicubic
upscale on small areas, and a bilinear shrink for a 'view all' option. That way
I can avoid scrolling and scaling at same time. Unlike the tools used on PDA's,
I have 1280x1024 pixels to play with.
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