Koch Curve

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

double factor;

void koch( int level, int scale, int rot )
{
    if(level > 0){
        koch(level-1, scale/3, rot);
        koch(level-1, scale/3, (rot+1)%6);
        koch(level-1, scale/3, (rot+5)%6);
        koch(level-1, scale/3, rot);
    }else{
        switch (rot){
            case 0: linerel(scale, 0); break;
            case 1: linerel(scale/2, scale*factor); break;
            case 2: linerel(-scale/2, scale*factor); break;
            case 3: linerel(-scale, 0); break;
            case 4: linerel(-scale/ 2, -scale*factor); break;
            case 5: linerel(scale/2, -scale*factor); break;
        }
    }
}

void startGraphics(){
    int gd=DETECT, gm;
    initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
}

void main(){
    int n, i;
    factor = sqrt(3)/-2;
    printf("Enter the level: ");
    scanf("%d", &n);
    startGraphics();
    for(i = 0; i <= n; i++){
        clearviewport();
        moveto(0, getmaxy()-50);
        koch(i, getmaxx(), 0);
        delay(1000);
    }
    getch();
}