Server Help

[Mine GO BOOM]

Code: Show/Hide #include <stdlib.h> #include <time.h> #include <math.h> /* Call this somewhere */ srand(time(NULL)); /* Later on (Angle is in radians) */ int X, Y; double Angle, Mag; Angle = (rand()/RAND_MAX)*6.283185307; Mag = sqrt(((float)rand())/(float)RAND_MAX)*radius; X = (int)(cos(Angle) * Mag); Y = (int)(sin(Angle) * Mag);

Thats all well and good, but you leave out one big problem with this: rounding. Cast typing does not handle rounding, it just throws away everything after the decimal point. Thus 0.9 and -0.9 both typecast to 0.

Lets go with this example. I created a C program that will pick one million random points inside of a circle with a radius of 50 pixels. Add up a counter for whenever a hit occurs at these points, and set an output image's alpha value to the percent chance of this point being picked. So the blackest part is the highest chance of being picked.


Zoom in a big, and you'll see that the X=0 and Y=0 lines both are very strong. At (0,0), it is at its strongest, almost 5 times as more likely than any non X=0/Y=0 point.


Now lets change it so instead of typecasting to int, use this rounding code:

Code: Show/Hide int round(double n) {    if (n >= 0.0)       return (int)(n + 0.5);    else       return (int)(n - 0.5); }

Do another random one million test points inside a 50 radius circle, and we'll get this:


So you'll have to add a bit more layer to be more correct, though the sqrt function helps move it away from the center. All of this is due to C's fast way of converting from floating to integers, and may not be required for all languages. To be complete, here is the non-sqrt method's output:


If these images all appear as black squares on your computer, IE has a problem with handling alpha tranparency with png images. Firefox/Opera/etc will handle the images correctly, or you could load them into any image editor.

[Dr Brain]

That's all well and good mgb, but that's not the problem he's complaining about.
_________________
Hyperspace Owner

Smong> so long as 99% deaths feel lame it will always be hyperspace to me

[Maverick]

Fixed code that should work:

Code: Show/Hide    case OP_Player:       {   // Player-level commands          if (c->check("about"))          {             sendPrivate(p, "I am a plain vanilla flavored bot.  Yup, just as plain and useless as can be.");          }          if (c->check("confuse"))          {             srand(time(NULL));             rand();             int X, Y;             double Angle, Mag;             Angle = (rand()/RAND_MAX)*6.283185307;             Mag = sqrt(((float)rand())/(float)RAND_MAX)*10;             X = (int)(cos(Angle) * Mag);             Y = (int)(sin(Angle) * Mag);             {                sendPrivate(p, "*warpto "+String(X)+" "+String(Y));                sendPrivate(p, "You have dodged your opponents weapons!  Now go for the kill!");             }          }       }    } }

The player is warped to a coordinate in a circle of 10 tiles, however not from its original position. Use

Code: Show/Hide X = X + p->tile.x; Y = Y + p->tile.y;

to warp the player to a random location from the player's original location.
Also notice that you must use rand(); once after using srand(); .
_________________

Nickname: Maverick (I changed my name!)
TWCore developer | Subspace statistics

[Mine GO BOOM]

[Maverick]