Koch SnowFlake

[Richard Lung]

Hi, I have a problems on doing the Koch SnowFlake.
I'm confuse with how to approach the recursion.
this is my current code

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class KochCurve extends Frame {
  
  Graphics2D graph;
  //int x1 = 400;
  //int y1 = (int)(400 - 0.5*Math.sqrt(30000));
  
  public void paint(Graphics g) 
  {
   
    graph = (Graphics2D) g;
    
    drawKochCurves(1,500,(int)(400 + 0.5*Math.sqrt(30000)),  400, (int)(400 - 0.5*Math.sqrt(30000)));
    drawKochCurves(1,300, (int)(400 + 0.5*Math.sqrt(30000)), 500,  (int)(400 + 0.5*Math.sqrt(30000)));
    drawKochCurves(1, 400, (int)(400 - 0.5*Math.sqrt(30000)), 300, (int)(400 + 0.5*Math.sqrt(30000)));
    
  }
  

  public void drawKochCurves(int level, int x1,int y1,int x5, int y5) {
    
    int x2,x3,x4;
    int y2,y3,y4;
    int deltaX,deltaY;
    
    
    deltaX = x5-x1;
    deltaY = y5-y1;
    
    x2 = x1+deltaX/3;
    y2 = y1+deltaY/3;
    
    x3 = (int)((0.5 * (x1 + x5)) + Math.sqrt(3) * (y1-y5) /6);
    y3 = (int)(0.5 * (y1 + y5) + Math.sqrt(3) * (x5-x1) / 6);
    
    x4 = x1 + 2 * deltaX/3;
    y4 = y1 + 2 * deltaY/3;
    
    if(level == 1) { 
      
      graph.drawLine(x1,y1,x2,y2);
      graph.drawLine(x2,y2,x3,y3);
      graph.drawLine(x3,y3,x4,y4);
      graph.drawLine(x4,y4,x5,y5);
    }
    else if ( level >= 1) {
      level --;
      drawKochCurves(level, x1, y1, x5, y5);
      
    }
    
    else {
      graph.drawLine(x1,y1,x5,y5);
    }
    
  }
   
  public static void main(String args[]) {
    Frame frame = new KochCurve();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing( WindowEvent we) {
        System.exit(0); 
      }
    });
    frame.setSize(800,800);
    frame.setVisible(true);
  }  
}

[fred rosenberger]

What EXACTLY is your question? posting 70 lines of code and saying "i'm not sure what to do" isn't really very helpful. Does this code you posted compile? Does it run? Do you not understand what it does? Does it not do something you think it should?

reading your post, nobody has any idea what kind of help you need, and few folk are going to take the effort to help you figure it out. The more details, the more focused your question (heck, you didn't even ASK a question), the more likely you are to get the help you need.

[Richard Lung]

sorry for not giving the detail problem.
so I want to create a snow flakes curves
something similar to this : http://www.owlnet.rice.edu/~comp212/06-spring/projects/kochCurve/koch.html
and I am having problem with approaching the recursion.
I am stuck, so I tried to set the level, whenever the level is, I would keep continue to making it as level 1.
I know that the problem is the recursion because I keep doing reduce the level until 1.
sorry if it's not clear it's difficult to explain exactly how. please see the sample if you don't mind

[Rob Spoor]

This problem has come up before, and I remember writing a nice piece of code for it. That was a while ago though, so it may be hard to find.

I do remember you shouldn't go over 7 or 8 iterations because that will start to take multiple minutes just to render.

[Rob Spoor]

Here is the thread I was talking about.

[Ulrika Tingle]

Richard Lung wrote:I'm confuse with how to approach the recursion.

Who said you needed to use recursion?

Try something else first. Then maybe recursion will seem more like a natural choise and then you'll know how to do it.

[Richard Lung]

I got it now..

Thanks guys