CGR Ass 5 - Koch Curve

#include <iostream>
#include <math.h>
#include <graphics.h>
using namespace std;

class kochCurve {
public:
    void koch(int it, int x1, int y1, int x5, int y5) {
        int x2, y2, x3, y3, x4, y4;
        int dx, dy;
        if (it == 0) {
            line(x1, y1, x5, y5); // Draw a straight line
        } else {
            delay(10);
            dx = (x5 - x1) / 3;
            dy = (y5 - y1) / 3;

            // Points for dividing and calculating the Koch curve
            x2 = x1 + dx;
            y2 = y1 + dy;
            x3 = static_cast<int>(0.5 * (x1 + x5) + sqrt(3) * (y1 - y5) / 6);
            y3 = static_cast<int>(0.5 * (y1 + y5) + sqrt(3) * (x5 - x1) / 6);
            x4 = 2 * dx + x1;
            y4 = 2 * dy + y1;

            // Recursive calls
            koch(it - 1, x1, y1, x2, y2);
            koch(it - 1, x2, y2, x3, y3);
            koch(it - 1, x3, y3, x4, y4);
            koch(it - 1, x4, y4, x5, y5);
        }
    }
};

int main() {
    kochCurve k;
    int it;

    // User input
    cout << "Enter Number Of Iterations: ";
    cin >> it;

    // Graphics initialization
    int gd = DETECT, gm;
    initgraph(&gd, &gm, NULL);

    // Draw the Koch snowflake
    k.koch(it, 150, 20, 20, 280);
    k.koch(it, 280, 280, 150, 20);
    k.koch(it, 20, 280, 280, 280);

    getch();
    closegraph();
    return 0;
}