Message-ID: <388228CE.2B807C34@gtcom.net>
From: Krogg <krogg DOT no DOT to DOT spam AT gtcom DOT net>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: another allegro drawing question
References: <k4mg4.371$u01 DOT 5912 AT nntp0 DOT chicago DOT il DOT ameritech DOT net>
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Date: Sun, 16 Jan 2000 15:23:42 -0500
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Matt Huston wrote:
> 
> Okay, I have two pong paddles that move accross the screen.  They move and
> all ,but leave a smeere accross
> the screen.  They are 150x25x8 bit BITMAPs in a datafile.  You may find this
> code useful in helping me.
> 
> Thanks,
> M. Huston
> 
> ////////////////////////////////////////////////////
> 
> void draw_pong()
> {
>  draw_sprite(BUFFER, GAMEDATA[BMPPONG1].dat, pong1_x, pong1_y);
>  draw_sprite(BUFFER, GAMEDATA[BMPPONG2].dat, pong2_x, pong2_y);
> 
>  blit(BUFFER,screen,0,0,0,0,640,480);
>  // vsync(); //It made the paddles move slower so I left it out
> }


You forgot to clear the buffer....

you can put it in like below:

   void draw_pong()
{
  clear(BUFFER);

  draw_sprite(BUFFER, GAMEDATA[BMPPONG1].dat, pong1_x, pong1_y);
  draw_sprite(BUFFER, GAMEDATA[BMPPONG2].dat, pong2_x, pong2_y);
  
  draw_any_thing_else_that_needs_to_be_drawn();


  blit(BUFFER,screen,0,0,0,0,640,480);
  
}



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