//KOCH CURVE GENERATOR
import java.awt.*;
import java.awt.event.*;
public class Koch extends Frame
{ public static void main(String[] args){new Koch();}
Koch()
{ super("Koch. Click the mouse button to increase the level");
addWindowListener(new WindowAdapter()
{public void windowClosing(
WindowEvent e){System.exit(0);}});
setSize (600, 500);
add("Center", new CvKoch());
show();
}
}
class CvKoch extends Canvas
{ public float x, y;
double dir;
int midX, midY, level = 1;
int iX(float x){return Math.round(midX+x);}
int iY(float y){return Math.round(midY-y);}
CvKoch()
{ addMouseListener(new MouseAdapter()
{ public void mousePressed(MouseEvent evt)
{ level++; // each mouse click increases the level
repaint();
}
});
}
public void paint(Graphics g)
{ Dimension d = getSize();
int maxX = d.width - 1, maxY = d.height - 1,
length=3* maxX / 4;
midX = maxX/2; midY = maxY/2;
x = (float)(-length/2); // Start point
y = 0;
dir = 0;
drawKoch(g, length, level);
}
public void drawKoch(Graphics g, double len, int n)
{ if (n==0)
{ double dirRad, xInc, yInc;
dirRad = dir * Math.PI/180;
xInc = len * Math.cos(dirRad); // x increment
yInc = len * Math.sin(dirRad); // y increment
float x1=x+ (float)xInc,
y1=y+ (float)yInc;
g.drawLine(iX(x), iY(y), iX(x1), iY(y1));
x = x1;
y = y1;
}
else
{ drawKoch(g, len/=3, --n);
dir += 60;
drawKoch(g, len, n);
dir-=120;
drawKoch(g, len, n);
dir += 60;
drawKoch(g, len, n);
}
}
}
SAMPLE OUTPUT:
