Message-ID:	<002701be305c$4794a140$ecf8c6c3@johans-dator>
From:	"Johan Henriksson" <johan DOT he AT telia DOT com>
To:	<djgpp AT delorie DOT com>
Subject:	Re: StarMaps
Date:	Sat, 26 Dec 1998 00:14:09 +0100
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Reply-To:	djgpp AT delorie DOT com

-----Original Message-----
From: Mad Cow <sw AT tenforward DOT com>
To: djgpp AT delorie DOT com <djgpp AT delorie DOT com>
Date: Friday, December 25, 1998 10:23 PM
Subject: StarMaps


>humm..I'm a novice djgpp'er, and need some help on somethin'
>
>i want to make a StarMap, uh, like so--
>
>     1 2 3 4 5 6 7 8 9 0
>   A * * * * * * * * * *
>   B * * * * * * * * * *
>   C * * # * * * * * * *
>   D * * * * * * * * * *
>   E * * * * * * * * * *
>   F * * * * * * * * * *
>   G * * * * * * * * * *
>   H * * * * * * # * * *
>   I * * * * * * * * * *
>   J * * * * * * * * * *
>
>
>        This is a game i want to make, i want to have it so that ppl can
>move a ship from
> say  C3 to  H7  but, how do i make a thing to calculate distance, and
>maybe even a path?
> say the distance would be  5, and the path would be C3-D4-E5-F6-G7-H7, so,
>please help
> on this one..all help is deeply apreciated..


Hello sickness (Sorry, just a *sick* joke :)
To calculate the distance between two points in 2D-space, you use the
pythagorean theorem. I give you some code from X-type:

int get_distance(int x1, int y1, int x2, int y2)
 {
 return(sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
 }

This function returns the distance between x1,y1 and x2,y2...

 short int gox,goy,speed;
 float del;

 del=speed/sqrt((x-gx)*(x-gx)+(y-gy)*(y-gy));
 gox=-((float)((float)x-(float)gx)*del);
 goy=-((float)((float)y-(float)gy)*del);

 ...and this piece o' code returns the path for a bullet or something like
that. Set the speedvariable to pixels it will move every time. Every time
you want to move it, do x+=gox and y+=goy. Well good night as we say here
00:12.



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