Server Help

[Bak]

don't rely on a website to do math for you. You can learn it off a website and then apply it to your problem. That's how it's meant to be done anyways

[Quan Chi2]

Yes, Im trying to do that. I know the math, but I'm having trouble putting it in the code... I have almost no idea how to do this besides making an equation.. I'm just trying to.

[Mine GO BOOM]

Code: Show/Hide void PickRandomSpotInCircle(int CircleX, int CircleY, int Radius, int &XCoord, int &YCoord) {    double theta, r;    r = (double)rand() / RAND_MAX * Radius;    theta = (double)rand() / RAND_MAX * 6.28319; /* aka: 2pi */    XCoord = (int)(r * cos(theta)) + CircleX;    YCoord = (int)(r * sin(theta)) + CircleY; }

[Quan Chi2]

is that a built in function?

[Quan Chi2]

ty for the help

[Quan Chi2]

hey lol id you make that up yourself? looks cool lol seriously im looking up some things in that code to learn how it works hehe

[Bak]

(shakes head)

stop triple posting. And only post relevant things, not "cool"

[Quan Chi2]

lol sorry









(oops i did it again :/ )

[Quan Chi2]

um.. im supposed to fill in the coords and stuff right?

[Muskrat]

That would have been a perfect opportunity to use the edit button.

[Mine GO BOOM]

[Quan Chi2]

ok.. i see what you're saying. in the first post i just didnt understand. i had done a google search on polar to rectangular but i didnt understand the math.. not quite at that level yet Thank you very much for the help

[Underlord]

Sample Code to warp pilot within a box size area

Code: Show/Hide #include "time.h" // do   srand(time(NULL));   when the bot logins or just once at any point before rand(); is called void botInfo::PutPilotInGame(Player *p) {    // warp pilot into game, 100 square area from coordinate 450,450    rand();    int coordx = 450;    int coordy = 450;    coordx = (int) (100 * ((float)rand()/RAND_MAX)) + 450;    coordy = (int) (100 * ((float)rand()/RAND_MAX)) + 450;    // warpto    sendPrivate(p,"*warpto " + (String) coordx + " " + (String) coordy); }

[Bak]

Code: Show/Hide 100 * ((float)rand()/RAND_MAX)

is equivilent to

Code: Show/Hide rand() % 100

but I think mod is faster than division and multiplication.

[Mine GO BOOM]

rand() is not a truly random number. The high-order bits are requested to be more random than the lower bits by the official standard. For the most part, most system's rand() is good enough that you can just mod the number you want, but to get a more random number, you should use the high-order bits, which involves using the methods Underlord and I both posted.

Doing a quick test on the standard deviation of rand() on different amounts with different sample sets shows that both methods on Windows 2000's stdlib work almost identical. On other system's implementation of rand, it maybe different.

And in the case of speed, the bot is usually not trying to be real-time, and spends most of its time idling. So in this case, its better to error on the side of more accurate than speed. And in the case where you are using the string class, the speed between these methods is the least of your worries.

[Underlord]

[Bak]

learn something new every day...

This actually came up a day after reading MGB's responce. I made a c program for a microcontroller and it was supposed to chose a random color for a bi-color LED, red or green. However, it chose red 95% of the time. Thinking about what mgb said, I changed

Code: Show/Hide rand() % 2

to

Code: Show/Hide (rand() % 10000) / 5000

and it finally started picking green a lot more. Funny how this doesn't come up in years of programming until the day after someone tells it to you. Another option I was considering was to load an array with like 5 red and 5 green values, then doing a random shuffle on the data, so for any 10 tries you'd get 5 reds and 5 greens, but the order would be random.

[Dr Brain]

On all of the uCs I've programmed there hasn't been a rand() so I've always had to write my own psudeo-random number generator. Usually just a shift and xor does the trick.
_________________
Hyperspace Owner

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

[Quan Chi2]

why did Underlord include time.h?

[Dr Brain]

Probably because he used a function in time.h. Just a guess...

[Quan Chi2]

lol.. funny

[Bak]

Code: Show/Hide // do   srand(time(NULL));   when the bot logins or just once at any point before rand(); is called

time() is defined in time.h
_________________
SubSpace Discretion: A Third Generation SubSpace Client

[Maverick]

I would like to add to this topic that I have found a topic in another forum where this exact topic is discussed. Also MGB's code is discussed there.

http://gamedev.net/community/forums/topic.asp?topic_id=72305

It comes down to that MGB's code doesn't completely work (picks points to the center too much) and the following code does work:

(too bad the picture in the thread is gone)

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);

_________________

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

[Quan Chi2]

I tried..

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));             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);             {                String s;                s += "*warpto";                s += " X Y";                sendPrivate(p, s.msg);                sendPrivate(p, "You have dodged your opponents weapons!  Now go for the kill!");             }          }       }    } }

I think I made a good attempt though

It does the message but it doesnt do the warp.. anything wrong?

[Dr Brain]

Yes, your bot will say exactly (no replacement) "*warpto X Y" The server doesn't know how to warp a player there.