FractalEdi

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

using namespace std;

float x,y;
float pi = 3.1415;
int angle;
int WIDTH = 900;
int HEIGHT = 600;

/// mareste unghiul la care este desenata o linie din fractal cu "alpha" de grade
void Plus(int alpha)
{
    angle += alpha;
    if( angle >= 360 )
        angle = angle - 360;
}


/// micsoreasa unghiul la care este desenata o linie din fractal cu "alpha" de grade
void Minus(int alpha)
{
    angle -= alpha;
    if( angle < 0 )
        angle = angle + 360;
}


/// deseneaza o linie din fractal la unghiul "angle"
void DrawLine(float length)
{
    float new_x,new_y;
    float angle_radians = 2*3.141592*angle/360;
    new_x = x + length*cos(angle_radians) ;
    new_y = y - length*sin(angle_radians);

    line(x,y,new_x,new_y);

    x = new_x;
    y = new_y;
}

/// functiile recursive care deseneaza fractalul
void X(float length, int order);
void Y(float length, int order);

void X(float length, int order)
{
    if( order >= 1 )
    {
        X(length,order-1);
        Plus(90);
        Y(length,order-1);
        DrawLine(length);
        Plus(90);
    }
}

void Y(float length, int order)
{
    if( order >= 1 )
    {
        Minus(90);
        DrawLine(length);
        X(length,order-1);
        Minus(90);
        Y(length,order-1);
    }
}

int main()
{
    initwindow(WIDTH,HEIGHT);

    for (int order = 1; order <= 12; order++)
    {
        x = 2*(WIDTH-20)/3;
        y = 2*HEIGHT/3;
        angle = 0;

        cleardevice();
        DrawLine(7);
        X(7,order);
        outtextxy(150, 30, "Press any key...");
        getch();
    }

    return 0;
}