HaarObjectDetector detector;
HaarCascade cascade = new FaceHaarCascade();
detector = new HaarObjectDetector(cascade, 120);

 detector.SearchMode = (ObjectDetectorSearchMode.Default);
            detector.ScalingMode = (ObjectDetectorScalingMode.SmallerToGreater);
            detector.ScalingFactor = 1.5f;
            detector.UseParallelProcessing = true;
            detector.Suppression = 2;

            Stopwatch sw = Stopwatch.StartNew();
            // Process frame to detect objects
            Rectangle[] objects = detector.ProcessFrame(bitmap);

            sw.Stop();
            if (objects.Length > 0)
            {
                RectanglesMarker marker = new RectanglesMarker(objects, Color.Fuchsia);
                bitmap = marker.Apply(bitmap);
            }

fractal Sierpinski triangle โดยใช้ภาษา JAVA

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Toolkit;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TriangleFractal extends JPanel
{
	public TriangleFractal()
	{
		setBackground(Color.black);
	}
	public void paint(Graphics g)
	{
		super.paint(g);
		for(int i=0;i< 1000000;i++)
		{
			draw( g,  50, getWidth() - 50, getHeight()-50, getWidth()/2, getHeight()-25);
		}
	}

	public void draw(Graphics g, double n,double w,double h,double x,double y)
	{
		if(n ==0)
		{
			g.setColor(Color.green);
			g.fillRect((int)(x+Math.random()*w-w/2),(int) (y+Math.random()*h-h/2), 1, 1);
			return;
		}
		
		double r= Math.random();
		if(r < 1.0/3.0)
		{
			y = y - h /2;
			
		}
		else if(r < 2.0/3.0)
		{
			x = x - w/4;
		}
		else
		{
			x = x + w/4;
		}
		draw( g,  n-1, w/2, h/2, x, y);
	}
	public static void main(String[] args)
	{
		JFrame fnt = new JFrame();
		
		fnt.add(new TriangleFractal());
		fnt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		double width = screenSize.getWidth();
		double height = screenSize.getHeight();
		fnt.setSize((int)width, (int)height);
		fnt.setVisible(true);
		
	}

}

จำนวนครั้งของ recursive n=1

จำนวนครั้งของ recursive n=2

จำนวนครั้งของ recursive n=3

จำนวนครั้งของ recursive n=4

จำนวนครั้งของ recursive n=5

จำนวนครั้งของ recursive n=6

จำนวนครั้งของ recursive n=7

จำนวนครั้งของ recursive n=30

วันนี้เราจะมาเขียนโปรแกรม Recursive กันนะครับ

koch snowflake in JAVA

import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;


public class KochSnowFlake extends JFrame
{ 
	private static final long serialVersionUID = 1L;

	int num=1;

	public KochSnowFlake()
	{
		setSize(600, 600);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
		
		Thread t= new Thread(new Runnable()
		{
			
			@Override
			public void run()
			{
				while(true)
				{
					for(int i=1;i<= 10;i++)
					{
						try
						{
							Thread.sleep(6000 );
						} catch (InterruptedException e)
						{
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						num=i;
						
						repaint();
						
					}
				}
				
			}
		});
		t.start();
		
	}

	public void paint(Graphics g)
	{
		super.paint(g);
		Graphics2D gg=(Graphics2D)g;
		
		Vector now= new Vector(getWidth() / 5.0, getHeight()/3.0*2.0);
		Vector dir_with_size= new Vector(getWidth() /5.0*3.0, 0);
		dir_with_size= dir_with_size.rotate(Math.PI/3);
		createSnowFlake( gg ,  now, dir_with_size, num);
		
		now= now.add(dir_with_size);
		dir_with_size= dir_with_size.rotate(-Math.PI/3*2);
		createSnowFlake( gg ,  now, dir_with_size, num);
		
		now= now.add(dir_with_size);
		dir_with_size= dir_with_size.rotate(-Math.PI/3*2);
		createSnowFlake( gg ,  now, dir_with_size, num);
		
	}
	public void createSnowFlake(Graphics2D g , Vector now,Vector dir_with_size,int n)
	{
		if(n==0) return;
		
		if(n==1)
		{
			Vector a,d;
			a = now;
			d = dir_with_size.add(now);
			g.drawLine((int)a.x,(int)a.y, (int)d.x,(int)d.y);
			return;
		}
		Vector a,b,c,d;
		a = now;
		b = dir_with_size.mul(1.0/3.0).add(now);
		
		c = dir_with_size.mul(2.0/3.0).add(now);
		d = dir_with_size.mul(1).add(now);
		
		
		Vector dir_with_size2= dir_with_size.rotate(Math.PI /3.0).mul(1.0/3.0);
		Vector start3 = dir_with_size2.add(b);
		Vector dir_with_size3= c.sub(start3)  ;

		createSnowFlake( g ,  b, dir_with_size2, n-1);
		createSnowFlake( g ,  start3, dir_with_size3, n-1);

		createSnowFlake( g ,  a, dir_with_size.mul(1.0/3.0), n-1);
		createSnowFlake( g ,  c, dir_with_size.mul(1.0/3.0), n-1);
		
	}
	
	public static void main(String[] args)
	{
		new KochSnowFlake();

	}

}


class Vector
{
	public double x,y;
	public Vector(){}
	public Vector (double xx,double yy)
	{
		x=xx;
		y=yy;
	}
	public Vector rotate(double angle)
	{
		double xx,yy;
		double c = Math.cos(angle);
		double s = Math.sin(angle);
		
		xx = x*c + y*s;
		yy = -x*s + y*c;
		
		
		return new Vector(xx,yy);
	}
	
	public Vector mul(double m)
	{
		return new Vector(x*m,y*m);
	}
	
	public Vector add(Vector v)
	{
		return new Vector(x+v.x,y+v.y);
	}
	public Vector sub(Vector v)
	{
		return new Vector(x-v.x,y-v.y);
	}
}

  int count = 0;
        Image img;
        Random rand = new Random();
 for (int ii = 0; ii < 1000; ii++)
            {
                img = new Bitmap(120, 70);
                Graphics g = Graphics.FromImage(img);

                int i = rand.Next(10000);
                String s = "" + (char)(rand.Next(26) + 65);
                s += (char)(rand.Next(26) + 65);
                s += i;

                g.DrawString(s, new Font("Tahoma", 22, FontStyle.Regular), Brushes.Black, 5, 10);

                for (int j = 0; j < 10; j++)
                {
                    int x1, y1, x2, y2;
                    x1 = rand.Next(26);
                    x2 = rand.Next(26) + 94;
                    y1 = rand.Next(70);
                    y2 = rand.Next(70);

                    g.DrawLine(new Pen(Color.FromArgb(rand.Next(70), rand.Next(70), rand.Next(70))), x1, y1, x2, y2);

                }

                g.Flush();
                img.Save("D://capcha//" + count + ".PNG", System.Drawing.Imaging.ImageFormat.Png);


                String path, key, phone;
                // id = Int32.Parse(this.textBox_id.Text);
                path = count + ".PNG";
                key = s;


                string cs = @"server=localhost;userid=root;password=1234;database=yyy";
                MySqlConnection conn = new MySqlConnection(cs);

                String sql = @"INSERT INTO capcha VALUES (0, '" + path + "','" + key + "' )";
                MySqlCommand comm = new MySqlCommand(sql, conn);
                conn.Open();
                comm.ExecuteNonQuery();


                conn.Close();

                count++;
            }

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