From:	gregorio AT jet DOT es (Grzegorz Adam Hankiewicz)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Pinball-programming
Date:	Wed, 25 Feb 1998 14:07:42 GMT
Organization:	Gogosoftware
Lines:	18
Message-ID:	<34f424db.1643605@news.jet.es>
References:	<6d16pp$4q4s$1 AT www DOT univie DOT ac DOT at>
NNTP-Posting-Host:	infon997.jet.es
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

>I need help with my programm. I wanted to programm a breakout game, where 
>a ball moves around. I have tried to use " (sin x)² + (cos x)² = 1 " or 
>something like that to calculate the next coordinates, but it isn`t 
>working very well - in a nutshell it is bullshit -.

Too difficult. The easy way is to give the ball two coordinates at
startup. Then, you add some 'movement' values to it each frame. Say
you want a perfect diagonal move, then x_add=1 and y_add=1 if the ball
is moving right and down. If you want to move slightly down and up,
you could say then x_add = 2 and y_add = -1.

For each frame you add the values x_add and y_add to the coordinates
of the ball, and display it in the new place. Of course, before moving
you have to check if there's a brick at the place you want to move the
ball so that you can make it bounce off.

- Grzegorz Adam Hankiewicz - gregorio AT jet DOT es - http://web.jet.es/gregorio
- Gogosoftware - http://web.jet.es/gregorio/gogosoftware

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