interference/src/tools.c

#include "tools.h"
#include <math.h>
#include <stdlib.h>

int
sign(int x)
{
	return (x > 0) - (x < 0); /* from jtmm2 */
}

int
length(int x1, int y1, int x2, int y2)
{
	const int dist_x = abs(x1 - x2);
	const int dist_y = abs(y1 - y2);
	const float dist = sqrt(dist_x * dist_x + dist_y * dist_y);
	return dist;
}