From: frenchc AT cadvision DOT com (frenchc)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Allegro Wierdness (rotate_sprite)...
Date: 20 Jan 1997 04:07:52 GMT
Organization: CADVision Development Corp.
Lines: 37
Message-ID: <5bur2o$308i@elmo.cadvision.com>
References: <5b8rfb$2da8 AT elmo DOT cadvision DOT com> <krb6dBAG4V3yEwe2 AT talula DOT demon DOT co DOT uk>
NNTP-Posting-Host: ts35ip234.cadvision.com
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

In article <krb6dBAG4V3yEwe2 AT talula DOT demon DOT co DOT uk>, Shawn Hargreaves <Shawn AT talula DOT demon DOT co DOT uk> says:
>
>frenchc writes:
>>I'm finding the allegro fix class to be a bit wierd. The overloaded
>>operators seem to work ok, but why are the trig functions implemented the
>>way they are? Is there something i'm not getting? Shouldn't they be
>>designed to make the following possible:
>>
>>fix F, G;
>>(whatever) = F.cos();
>>(whatever) = F.sin();
>>(whatever) = F.atan2( G );
>
>What's wrong with just calling cos(F)? Allegro overloads the standard
>function names, so if you call cos on a float you will get the standard
>libc version, while if you pass it a fix object you'll get Allegro's
>version. That seems to me to be simpler than having it as a member
>function: my goal was to make the class as behave as similarly as
>possible to the native C syntax for ints and floats...

Ok, makes sense to me. I was just looking at the header, and thought from
looking at it that I would have to use fix::cos( F ) which was too messy
for me :) Thanks, anyways!

Which brings me to my next question. When I rotate a sprite, the edge gets
clipped. This isn't a big problem for square-ish sprites, but for elongated
ones this is a real problem :(

Is there an easy way around this? If neccesary, I guess I will have to hack
out my own rotate_sprite routine, or else have the sprites all copied onto
a 64x64 bitmap, then rotated, or something. I'll have a look at DEMO though,
and see how the text rotation was done.

>/*
> *  Shawn Hargreaves - shawn AT talula DOT demon DOT co DOT uk - http://www.talula.demon.co.uk/
> *  Ghoti: 'gh' as in 'enough', 'o' as in 'women', and 'ti' as in 'nation'.
> */