[plt-scheme] 2htdp/image questions

From: Jordan Johnson (jmj at fellowhuman.com)
Date: Sun Apr 18 12:30:03 EDT 2010

Why not (since it's already mostly written--right?) have a distinct  
bitmap image type and bitmap library that provides the color-list and  
alpha-color-list functionality of the old htdp/image lib?  (i.e., just  
rename the types of data in the old library to make it obvious that  
they are distinct from the 2htdp-style images)  My students thought  
the color-list exercises this year were really neat, so it would be  
nice to provide a way to continue doing them, tho in the long run I'd  
think it's best not to have two image libs so similarly named.


On Apr 18, 2010, at 7:51 AM, Robby Findler  
<robby at eecs.northwestern.edu> wrote:

> On Sun, Apr 18, 2010 at 9:27 AM, Stephen Bloch <sbloch at adelphi.edu>  
> wrote:
>> BTW, if two images both already had cached bitmaps, would it be  
>> faster or
>> slower to compare the bitmaps than to do the usual tree-traversal  
>> equality?
> Much slower in the common case.
>>  I guess that would depend on the size of the bitmaps, and the  
>> complexity of
>> the tree....
> Yes, of course, in general.
> But I really believe that if you want to be writing such functions you
> don't want 2htdp/image. You want a completely different
> representation.
> Robby
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