/* triangle.c */
#include <cstdlib>
#include <cstdint>
#include <curses.h>
//#include "getrandom_int.h" funny guys own rand, lets use crappy C rand from stdlib for now
/* The state word must be initialized to non-zero */
uint32_t xorshift32(uint32_t & state)
{
/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
uint32_t x = state;
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
return state = x;
}
int getrandom_int()
{
//return rand() & 0x7FFFFFFF;
static uint32_t state = 123;
xorshift32( state );
return state & 0x7FFFFFFF;
}
#define ITERMAX 10000
int main(void)
{
long iter;
int yi, xi;
int y[3], x[3];
int index;
int maxlines, maxcols;
/* initialize curses */
initscr();
cbreak();
noecho();
clear();
/* initialize triangle */
maxlines = LINES - 1;
maxcols = COLS - 1;
y[0] = 0;
x[0] = 0;
y[1] = maxlines;
x[1] = maxcols / 2;
y[2] = 0;
x[2] = maxcols;
mvaddch(y[0], x[0], '0');
mvaddch(y[1], x[1], '1');
mvaddch(y[2], x[2], '2');
/* initialize yi,xi with random values */
yi = getrandom_int() % maxlines;
xi = getrandom_int() % maxcols;
mvaddch(yi, xi, '.');
/* iterate the triangle */
for (iter = 0; iter < ITERMAX; iter++) {
index = getrandom_int() % 3;
yi = (yi + y[index]) / 2;
xi = (xi + x[index]) / 2;
mvaddch(yi, xi, '*');
refresh();
}
/* done */
mvaddstr(maxlines, 0, "Press any key to quit");
refresh();
getch();
endwin();
exit(0);
}
