The formula for finding point_distance.

[MrJackSparrow2]

I'm sure you already have this, but i'm trying to help.

Code: [Select]

#include <math.h>

double point_distance(double x1,double y1,double x2,double y2)
{
       return (double) sqrt( ((x2-x1)*(x2-x1)) + ((y2-y1)*(y2-y1)) );
}

[Austin]

And for two 3D points (I didn't define the types because I am not sure what you use):

Code: [Select]

d3d_point_distance(x1,y1,z1,x2,y2,z2) {
    return sqrt(sqr(x1-x2)+sqr(y1-y2)+sqr(z1-z2));
}

[Josh @ Dreamland]

The former has existed since R1, but the latter doesn't exist in 'other programs,' and I prolly won't add it until I actually do some 3D.

Post made October 22, 2008, 10:32:26 am was deleted at the author's request.

[score_under]

Oh dear, imaginary numbers.

#include <math.h>

double point_distance(double x1,double y1,double x2,double y2)
{
  int x_diff,y_diff;
  x_diff = x2-x1;
  y_diff = y2-y1;
  return (double)sqrt((x_diff*x_diff)+(y_diff*y_diff));
}

If I were to measure the distance from point (4,4) to point (0,0) without any checking on my part, this would cause a huge error as the numbers would suddenly mysteriously appear in the complex plane 

Off the top of my head,

#include <math.h>

double point_distance(double x1,double y1,double x2,double y2)
{
  int x_diff,y_diff;
  x_diff = abs(x2-x1);
  y_diff = abs(y2-y1);
  return (double)sqrt((x_diff*x_diff)+(y_diff*y_diff));
}

That should work better, right?

[sprintf()]

All square numbers are positive.

[score_under]

All square numbers are positive.

Of course I was... testing.

Post made November 15, 2008, 02:38:24 pm was deleted at the author's request.

[RetroX]

As far as I know, C++ doesn't have an i constant.  Would be cool, though.

[score_under]

If it had an "i" constant, then 99% of c++ programs would be broken.

It's hard to find a C++ prog that does NOT contain something similar to:

Code: [Select]

for(i=0;i<size;i++)

[Josh @ Dreamland]

XD @ i constant

Nah. C++ would just kill your game for you. ^_^

[RetroX]

Not actually an "i" variable, but support for imaginary numbers.  You could always just do sqrt(-1). =P

[ludamad]

RetroX: #include <Complex>

[RetroX]

Wait, C++ has a library for that? O_O

EDIT: Holy shit.  That is awesome.