#include <math.h>

#include "tectonics.h"

void get_cairo_size(cairo_t *cr, int *width, int *height)
{
   cairo_surface_t *surface = cairo_get_target(cr);
   *width = cairo_image_surface_get_width(surface);
   *height = cairo_image_surface_get_height(surface);
}


double rand01()
{
   return ((double) rand())/RAND_MAX;
}


double distance(struct point_t p1, struct point_t p2)
{
   double dx = p1.x-p2.x;
   double dy = p1.y-p2.y;

   return sqrt(dx*dx + dy*dy);
}