Game Calculator

[superlou]

I've seen a few posts that go pretty deep into some excellent math. I was wondering if anybody would have a use for a tool to experiment with writing gameplay optimizations? I've duct-taped a demo here that is a paper-thin (and ugly, don't forget ugly) wrapper over the Sage mathematics platform. Sage is pretty awesome and covers CAS and matrix operations using a python-like syntax.

Anyway, if there's some interest, I'll try to keep developing and make it more of a useable tool rather than a tech demo. Open to any comments and suggestions. It currently doesn't have basic nicities like version control or permissions, so you might want to play nice with each other's tools. It's also on a dirt cheap VPS so I apologize if it's not the fastest site out there.

Thanks,

Louis

[SunJumper]

I've developed a code piece that does the above in C, for eccentric orbits (e up to 1, not more), for Kerbin only at the moment (can do it for other KSP bodies, may add an option for custom bodies too).

#include <math.h> 
#include <stdio.h> 

int main(void) 

{ 

float apoapsis; 
float periapsis; 
float radius[17] = {1,1,1,1,600000,1,1,1,1,1,1,1,1,1,1,1,1};
float mu[17] = {1,1,1,1,3.5316e12,1,1,1,1,1,1,1,1,1,1,1,1};
int planet; 
float soi[17] = {1,1,1,1,84159286,1,1,1,1,1,1,1,1,1,1,1,1};
float eccentricity; 
float vp; 
float va; 
int i;
float vp2; 
float va2; 
float guess = 1000;
int repeat; 

repeat = 1; 

while (repeat != 0) 
{ 
planet = 17; 


printf("Velocity Calculator\n"); 
printf("Pick a body - \n"); 
printf("Sun - 0\n"); 
    printf("Moho - 1\n"); 
    printf("Eve - 2\n"); 
        printf("Gilly - 3\n"); 
    printf("Kerbin - 4\n"); 
        printf("Mun - 5\n"); 
        printf("Minmus - 6\n"); 
    printf("Duna - 7\n"); 
        printf("Ike - 8\n"); 
    printf("Dres - 9\n"); 
    printf("Jool - 10\n"); 
        printf("Laythe - 11\n"); 
        printf("Vall - 12\n"); 
        printf("Tylo - 13\n"); 
        printf("Bop - 14\n"); 
        printf("Pol - 15\n"); 
    printf("Eeloo - 16\n"); 
while (planet > 16 || planet < 0) 
{ 
printf("Pick your body:"); 
scanf("%d", &planet); 

} 



printf("Input Periapsis altitude (m):"); 
scanf("%f", &periapsis); 
printf("Input Apoapsis altitude (m):"); 
scanf("%f", &apoapsis);
eccentricity = (apoapsis - periapsis)/(apoapsis + periapsis + 2*radius[planet]);
printf("%f\n %f\n", eccentricity, mu[planet]);
vp2 = (1+eccentricity)*mu[planet]/(periapsis + radius[planet]);
va2 = (1-eccentricity)*mu[planet]/(apoapsis + radius[planet]);


va = sqrt(va2);
vp = sqrt(vp2);
printf("Periapsis velocity is: %f\n", vp);
printf("Apoapsis velocity is: %f\n", va);

if (apoapsis > soi[planet])
{
printf ("Warning, you will escape into the parent SOI!\n");
}

printf("Repeat? Enter zero for no, any other integer for yes\n");
scanf("%d", &repeat);

}

return 0;

}

[superlou]

Hi SunJumper. I converted the C code to Sage: http://gath.louissimons.com/tools/3

I need to figure out how to have my preprocessor identify strings properly. Currently, when you enter the body name, you need to wrap it in quotes. So, if I enter 'kerbin', 70000, and 73000, I get:

Eccentricity: 0.00297619047619048

Periapsis velocity: 2285.64390920694

Apoapsis velocity: 2299.28954448579

[superlou]

Whoops, swapped periapsis and apoapsis. How about:

Eccentricity: 0.00297619047619048

Apoapsis velocity: 2285.64390920694

Periapsis velocity: 2299.28954448579