From:	krand AT ican DOT net (Andrew Ellem)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Hiding mouse before drawing not working (Allegro)
Date:	Sun, 08 Jun 1997 02:35:23 GMT
Organization:	ACC TelEnterprises Ltd.
Lines:	33
Message-ID:	<5nd5kn$63l$1@readme.ican.net>
References:	<5ncmia$ees AT news DOT interlog DOT com>
Reply-To:	krand AT ican DOT net
NNTP-Posting-Host:	ppp-174.toronto-11.ican.net
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <5ncmia$ees AT news DOT interlog DOT com>, gautam AT interlog DOT com (Gautam N. Lad) wrote:
>Hi,
>I'm making a simple tile/map editor, and I've a grid setup.  When a user clicks
> on 
>a grid, I do the following (psuedo code): 
>
>if click is in range
> freeze_mouse_flag=TRUE; // Allegro extern variable for hiding/show mouse     
> tblit();  // blit the sprite/tile
> freeze_mouse_flag=FALSE;
>
>For some reason, this won't work!  The mouse hides, the bitmap gets drawn, and 
>the mouse becomes visible again.  The drawn bitmap still looks messed up,
> 'cause 
>the drawn bitmap looks like the mouse is still over it.
>
>What am I doing wrong?

You're not hiding the mouse cursor, you're only preventing it from moving.

Try:
    freeze_mouse_flag=TRUE; // Prevent the mouse from being moved
    show_mouse(NULL); // Tells allegro to not draw the mouse
    tblit();
    show_mouse(screen); // Tells allegro it can draw the mouse again
    freeze_mouse_flag=FALSE; // Let the mouse move again

You don't even need the freeze_mouse_*, but it doesn't hurt ;)

Hope this helps,

Andrew Ellem
krand at ican.net

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