bayes2d.java

A Web Tutorial on Discrete Features of Bayes Decision Theory This applet allows for the calculation

              
              int[] xset2 = {xdraw[0], xdraw[1], 380, 380, 760};
              int[] yset2 = {ydraw[0], ydraw[1], 320, 20, 20}; 
              g1.setColor(Color.YELLOW);
              g1.fillPolygon(xset2, yset2, 5);              
          }
              
         //if points are right and top
          if ((right == true) && (top == true))
          {
              int[] xset1 = {xdraw[0], 760, xdraw[1]};
              int[] yset1 = {ydraw[0], 20, ydraw[1]}; 
              g1.setColor(Color.pink);
              g1.fillPolygon(xset1, yset1, 3);
              
              int[] xset2 = {xdraw[0], xdraw[1], 380, 380, 760};
              int[] yset2 = {ydraw[0], ydraw[1], 20, 320, 320}; 
              g1.setColor(Color.YELLOW);
              g1.fillPolygon(xset2, yset2, 5);              
          }
                            
         //if points are top and bottom
          if ((top == true) && (bottom == true))
            {
              int[] xset1 = {xdraw[0], 760, 760, xdraw[1]};
              int[] yset1 = {ydraw[0], 320, 20, ydraw[1]}; 
              g1.setColor(Color.pink);
              g1.fillPolygon(xset1, yset1, 4);
              
              int[] xset2 = {xdraw[0], xdraw[1], 380, 380};
              int[] yset2 = {ydraw[0], ydraw[1], 20, 320}; 
              g1.setColor(Color.YELLOW);
              g1.fillPolygon(xset2, yset2, 4);              
          }
           
 g1.setColor(Color.blue);
        g1.drawLine(380, 170, 760, 170);
        g1.drawLine(570, 20, 570, 320);
        g1.drawString("x", 762,166);
        g1.drawString("y", 572,18);
        
        //show numbers on axis
        g1.drawLine(390, 166, 390, 170);
        g1.drawLine(410, 166, 410, 170);
        g1.drawLine(430, 166, 430, 170);
        g1.drawLine(450, 166, 450, 170);
        g1.drawLine(470, 166, 470, 170);
        g1.drawLine(490, 166, 490, 170);
        g1.drawLine(510, 166, 510, 170);
        g1.drawLine(530, 166, 530, 170);
        g1.drawLine(550, 166, 550, 170);
        g1.drawLine(570, 166, 570, 170);
        g1.drawLine(590, 166, 590, 170);
        g1.drawLine(610, 166, 610, 170);
        g1.drawLine(630, 166, 630, 170);
        g1.drawLine(650, 166, 650, 170);
        g1.drawLine(670, 166, 670, 170);
        g1.drawLine(690, 166, 690, 170);
        g1.drawLine(710, 166, 710, 170);
        g1.drawLine(730, 166, 730, 170);
        g1.drawLine(750, 166, 750, 170);
        
        g1.drawString("1.8", 742,182);
        g1.drawString("1.4", 702,182);
        g1.drawString("1.0", 662,182);
        g1.drawString("0.6", 622,182);
        g1.drawString("0.2", 582,182);
        g1.drawString("-0.2", 542,182);
        g1.drawString("-0.6", 502,182);
        g1.drawString("-1.0", 462,182);
        g1.drawString("-1.4", 422,182);
        g1.drawString("-1.8", 382,182);
        
        g1.drawLine(570, 20, 574, 20);
        g1.drawLine(570, 40, 574, 40);
        g1.drawLine(570, 60, 574, 60);
        g1.drawLine(570, 80, 574, 80);
        g1.drawLine(570, 100, 574, 100);
        g1.drawLine(570, 120, 574, 120); 
        g1.drawLine(570, 140, 574, 140);
        g1.drawLine(570, 160, 574, 160);
        g1.drawLine(570, 180, 574, 180);
        g1.drawLine(570, 200, 574, 200);
        g1.drawLine(570, 220, 574, 220);
        g1.drawLine(570, 240, 574, 240);
        g1.drawLine(570, 260, 574, 260);
        g1.drawLine(570, 280, 574, 280);
        g1.drawLine(570, 300, 574, 300);
        g1.drawLine(570, 320, 574, 320);

        g1.drawString("1.4", 574,40);
        g1.drawString("1.0", 574,80);
        g1.drawString("0.6", 574,120);
        g1.drawString("0.2", 574,160);
        g1.drawString("-0.2", 574,200);
        g1.drawString("-0.6", 574,240);
        g1.drawString("-1.0", 574,280);
        g1.drawString("-1.4", 574,320);
    
        

        g1.setColor(Color.red);
          g1.drawLine(xdraw[0], ydraw[0], xdraw[1], ydraw[1]); 
          
    //        g1.drawString("Decision line is out of drwaing srea bounds", 400,200);
          
          if (drawn == false)
            g1.drawString("Decision line is out of drwaing srea bounds", 400,200);
               
    }
    
    
    public void paint( Graphics g )
    {
        this.g1=g;
        g1.draw3DRect(380, 20, 380, 300, true);
        g1.setColor(Color.white);
        
        g1.fill3DRect(380, 20, 380, 300, true);    
        g1.setColor(Color.blue);
        g1.drawLine(380, 170, 760, 170);
        g1.drawLine(570, 20, 570, 320);
        g1.drawString("x", 762,166);
        g1.drawString("y", 572,18);
        
        //show numbers on axis
        g1.drawLine(390, 166, 390, 170);
        g1.drawLine(410, 166, 410, 170);
        g1.drawLine(430, 166, 430, 170);
        g1.drawLine(450, 166, 450, 170);
        g1.drawLine(470, 166, 470, 170);
        g1.drawLine(490, 166, 490, 170);
        g1.drawLine(510, 166, 510, 170);
        g1.drawLine(530, 166, 530, 170);
        g1.drawLine(550, 166, 550, 170);
        g1.drawLine(570, 166, 570, 170);
        g1.drawLine(590, 166, 590, 170);
        g1.drawLine(610, 166, 610, 170);
        g1.drawLine(630, 166, 630, 170);
        g1.drawLine(650, 166, 650, 170);
        g1.drawLine(670, 166, 670, 170);
        g1.drawLine(690, 166, 690, 170);
        g1.drawLine(710, 166, 710, 170);
        g1.drawLine(730, 166, 730, 170);
        g1.drawLine(750, 166, 750, 170);
        
        g1.drawString("1.8", 742,182);
        g1.drawString("1.4", 702,182);
        g1.drawString("1.0", 662,182);
        g1.drawString("0.6", 622,182);
        g1.drawString("0.2", 582,182);
        g1.drawString("-0.2", 542,182);
        g1.drawString("-0.6", 502,182);
        g1.drawString("-1.0", 462,182);
        g1.drawString("-1.4", 422,182);
        g1.drawString("-1.8", 382,182);
        
        g1.drawLine(570, 20, 574, 20);
        g1.drawLine(570, 40, 574, 40);
        g1.drawLine(570, 60, 574, 60);
        g1.drawLine(570, 80, 574, 80);
        g1.drawLine(570, 100, 574, 100);
        g1.drawLine(570, 120, 574, 120); 
        g1.drawLine(570, 140, 574, 140);
        g1.drawLine(570, 160, 574, 160);
        g1.drawLine(570, 180, 574, 180);
        g1.drawLine(570, 200, 574, 200);
        g1.drawLine(570, 220, 574, 220);
        g1.drawLine(570, 240, 574, 240);
        g1.drawLine(570, 260, 574, 260);
        g1.drawLine(570, 280, 574, 280);
        g1.drawLine(570, 300, 574, 300);
        g1.drawLine(570, 320, 574, 320);

        g1.drawString("1.4", 574,40);
        g1.drawString("1.0", 574,80);
        g1.drawString("0.6", 574,120);
        g1.drawString("0.2", 574,160);
        g1.drawString("-0.2", 574,200);
        g1.drawString("-0.6", 574,240);
        g1.drawString("-1.0", 574,280);
        g1.drawString("-1.4", 574,320);
        
             

        
    }

          public void repaint( Graphics g )
          {
          }

    private void scr_q2AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {

        double a;
        
        a=scr_q2.getValue();
        a=a/10;
        txt_q2.setText(Double.toString(a));
    }

    private void scr_q1AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
    double a;
        
        a=scr_q1.getValue();
        a=a/10;
        txt_q1.setText(Double.toString(a));
    }

 
    private void scr_p2AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
    double a;
        
        a=scr_p2.getValue();
        a=a/10;
        txt_p2.setText(Double.toString(a));
    }

    private void scr_p1AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
        double a;
        
        a=scr_p1.getValue();
        a=a/10;
        txt_p1.setText(Double.toString(a));
    }

    private void txt_pw2TextValueChanged(java.awt.event.TextEvent evt) {
        // changes the global private pw2
        pw2 = Double.parseDouble(txt_pw2.getText());
    }

    private void txt_pw1TextValueChanged(java.awt.event.TextEvent evt) {
        // changes the global pw1
        pw1 = Double.parseDouble(txt_pw1.getText());
                
    }

    private void scr_pw2AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
        double a,bb;
        int b;
        
        a=(int) scr_pw2.getValue();
        b= 10-(int) a;
        a=a/10.0;
        
        scr_pw1.setValue(b);
        bb=b/10.0;
        txt_pw2.setText(Double.toString(a));
        txt_pw1.setText(Double.toString(bb));
               
    }

    private void scr_pw1AdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
        double a,bb;
        int b;
        
        a= (int) scr_pw1.getValue();
        b= 10 - (int) a;
        a=a/10.0;

        scr_pw2.setValue(b);
        bb=b/10.0;
        txt_pw1.setText(Double.toString(a));
        txt_pw2.setText(Double.toString(bb));
        
               
        
    }

    private void btn_calculateActionPerformed(java.awt.event.ActionEvent evt) {

        //initialize variables;
        Graphics G;
    //this.txt_answer.setText("HELLO");    
       
        
    double Pw1 = Double.parseDouble(txt_pw1.getText());  // prior for class 1
    double Pw2 = Double.parseDouble(txt_pw2.getText()); // prior for class 2
     
    double [] q = new double[2];
    double [] p = new double[2];
    
 
    p[0] = Double.parseDouble(txt_p1.getText());
    p[1] = Double.parseDouble(txt_p2.getText());
   
    q[0] = Double.parseDouble(txt_q1.getText());
    q[1] = Double.parseDouble(txt_q2.getText());
    
     
    double [] X1 = new double[2];
    double [] X2 = new double[2];
    
    double [] w = new double[2];
    double wo;
    
    boundary2d findbound = new boundary2d(Pw1, Pw2, q, p);
        findbound.calculate();  
    
        X1 = findbound.getX1();
        X2 = findbound.getX2();
        //this.txt_answer.setText("HELLO2"); 
        




     //this.txt_answer.setText("HELLO3"); 
        w = findbound.getw();
        wo = findbound.getwo();
        
  //  X1[0] = ((double) x1)/100;
  //  X2[0] = ((double) x2)/100;
  //  X1[1] = ((double) y1)/100;
  //  X2[1] = ((double) y2)/100;

        x1 = (int) (w[0]*100);
    y1 = (int) (w[1]*100);
    x2=  (int) (wo*100);
    
    double temp1 = ((double) x1)/100;
    double temp2 = ((double) y1)/100;
    double temp3 = ((double) x2)/100;
    //    this.txt_answer.setText("points: (" +x1+ "," +y1 + ") ,(" +x2 + " ," +y2);
  
    String ctemp1="";
    String ctemp2="";
    String ctemp3="";
    
//set up the equations to look good...
    ctemp1 += temp1;

    if (temp2<0)
    {
        ctemp2 += temp2;
    }
    else
    {
        ctemp2 +="+";
        ctemp2 += temp2;
    }
    
    if (temp3<0)
    {
        ctemp3 += temp3;
    }
    else
    {
        ctemp3 +="+";
        ctemp3 += temp3;
    }
    
    
     this.txt_answer.setText("G(x) = " +ctemp1+ "*x  " +ctemp2 + "*y  " +ctemp3 + " = 0");
      this.repaint();
      this.update(this.g1);
      
    }  
    
    
    // Variables declaration - do not modify
    private java.awt.Button btn_calculate;
    private java.awt.Label label1;
    private java.awt.Label label2;
    private java.awt.Label label3;
    private java.awt.Label label4;
    private java.awt.Label lbl_p1;
    private java.awt.Label lbl_p2;
    private java.awt.Label lbl_q1;
    private java.awt.Label lbl_q2;
   // private java.awt.Panel panel1;
    private java.awt.Scrollbar scr_p1;
    private java.awt.Scrollbar scr_p2;
    private java.awt.Scrollbar scr_pw1;
    private java.awt.Scrollbar scr_pw2;
    private java.awt.Scrollbar scr_q1;
    private java.awt.Scrollbar scr_q2;
    private java.awt.TextField txt_answer;
    private java.awt.TextField txt_p1;
    private java.awt.TextField txt_p2;
    private java.awt.TextField txt_pw1;
    private java.awt.TextField txt_pw2;
    private java.awt.TextField txt_q1;
    private java.awt.TextField txt_q2;
    private java.awt.Rectangle rect; 
    
    // End of variables declaration
    
    // TODO overwrite start(), stop() and destroy() methods
}