🚀 go-pugleaf

In <7464@uqcspe.cs.uq.oz.au> warwick@cs.uq.oz.au (Warwick Allison) writes:

>rjwalsh@maths.tcd.ie (Robert Walsh) writes:

>>Does anyone know how to map a bitmap of arbitary size into an polygon
>>of arbitary size (the simplest example is mapping a bitmap into a
>>square)? 

>Yes.  Clip it.

>Seriously, it all depends HOW you want it mapped.  I could map a large
>image to a small square by clipping it.  You have to make some constraints
>before you can start devising an algorithm.

>One possibility would be to have the following restriction:

>	If pixels A and B and on the same horizontal line in the original
>	and they both appear in the final, then they must be on the
>	same horizontal in the final.

>Now the problem is simply one of mapping a line of pixels:

>         ************************************************

>to a sequence of lines of pixels:

>    *************  ****************************     *******


>Easy.
>Warwick

I don't think that was quite what I meant. Suppose I map a bitmap
onto this:

       ----
      /    \
      /    \
      ------

then I should get a bitmap appearing to hover in three space. The
bitmap should be scaled squashed at the top and fatter down towards
the bottom. If I map it onto a square, it should be an exact scale
replica of the original bitmap.

Extending the above further, I should be able to map the bitmap onto
something like this:

      /\
     /  |_
    /     |
    \______\

and have it scaled properly all across it.

Am I asking to do something that only a Cray could manage in realtime? Is
this feasible on a 33Mhz 386?

>--
>  _-_|\      warwick@cs.uq.oz.au            / eastings genistas /
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rjwalsh@maths.tcd.ie   \ The above comments are not Trinity's.
Robert Walsh             \ Hell, they're not even mine!
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