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  1. #1
    toby is offline Member
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    Jul 2007
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    Default Help with images...

    I have a coding problem... and if someone can help me finish it.. it would be grateful...
    I can't make the numbers to respond to the answers...... and follow the image says...

    Code:
    Java Code:
    import java.awt.*;
    import java.awt.event.*;
    import java.applet.Applet;
    
    public class TriangleArea extends Applet implements ActionListener {
    
        private Label lblInstructions, lblSideA, lblSideB, lblSideC,
                      lblSelect, lblAngles, lblArea, lblRightAngle;
        private TextField txtSideA, txtSideB, txtSideC;
        private Button btnCM, btnM, btnKM;
        double[] angles = new double[3];
        double radians;
        
        public void init() {
            setLayout(null);
            setupGUIComponents();
            final int WIDTH = 470, HEIGHT = 220;
            setSize(WIDTH, HEIGHT);
        }
        
        public void actionPerformed(ActionEvent ae) {
            String command = ae.getActionCommand();
            
            lblAngles.setText("Three angles are "+angles[0]+"degree, "+angles[1]+"degree and "+angles[2]+"degree");
            lblArea.setText("Area of the triangle is "+command);
            lblRightAngle.setText("It is a "+command+" triangle");
        }
    
        private void setupGUIComponents() {
            
            // initiaze the components
            lblInstructions = new Label("Enter the length of the sides of a triangle");
            lblSideA = new Label("a");  txtSideA = new TextField(5);
            lblSideB = new Label("b");  txtSideB = new TextField(5);
            lblSideC = new Label("c");  txtSideC = new TextField(5);
            lblSelect = new Label("Select unit:");
            btnCM = new Button("cm"); btnM = new Button("m"); btnKM = new Button("km");
            lblAngles = new Label();
            lblArea = new Label();
            lblRightAngle = new Label();
    
            // add action-listeners to the buttons
            btnCM.addActionListener(this); 
            btnM.addActionListener(this);
            btnKM.addActionListener(this);
    
            // allign the components to the frame
            lblInstructions.setBounds(100,10,250,20);
            lblSideA.setBounds(100,35,20,20); txtSideA.setBounds(220,35,115,20);
            lblSideB.setBounds(100,55,20,20); txtSideB.setBounds(220,55,115,20);
            lblSideC.setBounds(100,75,20,20); txtSideC.setBounds(220,75,115,20);
            lblSelect.setBounds(130,100,70,20);
            btnCM.setBounds(210,100,30,20); 
            btnM.setBounds(245,100,30,20);
            btnKM.setBounds(280,100,30,20);
            lblAngles.setBounds(20,140,410,20);
            lblArea.setBounds(20,165,410,20);
            lblRightAngle.setBounds(20,190,410,20);
            
            // add the components to the frame
            add(lblInstructions);
            add(lblSideA);  add(txtSideA);
            add(lblSideB);  add(txtSideB);
            add(lblSideC);  add(txtSideC);
            add(lblSelect); add(btnCM); add(btnM); add(btnKM);
            add(lblAngles); add(lblArea); add(lblRightAngle);
        }
        
        private double[] getAngles(int a, int b, int c)
        {
            // create an array to store the 3 angles
            double[] angles = new double[3];
            double radians;
    
            // cast all the int values to double
            double dA=(double)a, dB=(double)b, dC=(double)c;
            
            // angle A in radians = cos^-1 (b^2 + c^2 - a^2 / 2bc)
            // and then convert the radians to degrees
            radians = Math.acos((dB*dB + dC*dC - dA*dA) / (2.0*dB*dC));
            angles[0] = radians * 180.0 / Math.PI;
            
            // angle B in radians = cos^-1 (a^2 + c^2 - b^2 / 2ac)
            // and then convert the radians to degrees
            radians = Math.acos((dA*dA + dC*dC - dB*dB) / (2.0*dA*dC));
            angles[1] = radians * 180.0 / Math.PI;
            
            // angle C in degrees = 180 - degrees A - degrees B
            angles[2] = 180.0 - angles[0] - angles[1];
    
            // return the 3 angles
            return angles;
        }
        
    }
    When i try to input the numbers into the textfield....
    No number came out to the output....
    If anyway.... can help to complete the java code...??
    Thanks

  2. #2
    hardwired's Avatar
    hardwired is offline Senior Member
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    Default

    Java Code:
    //  <applet code="TA" width="400" height="400"></applet>
    import java.applet.Applet;
    import java.awt.*;
    import java.awt.event.*;
    import java.text.NumberFormat;
    
    public class TA extends Applet implements ActionListener {
    
        private Label lblSideA, lblSideB, lblSideC,
                      lblAngles, lblArea, lblRightAngle;
        private TextField txtSideA, txtSideB, txtSideC;
        NumberFormat nf;
        
        public void init() {
            nf = NumberFormat.getInstance();
            nf.setMaximumFractionDigits(2);
            setLayout(null);
            setupGUIComponents();
            final int WIDTH = 470, HEIGHT = 220;
            setSize(WIDTH, HEIGHT);
        }
        
        public void actionPerformed(ActionEvent ae) {
            String command = ae.getActionCommand();
            int a = Integer.parseInt(txtSideA.getText().trim());
            int b = Integer.parseInt(txtSideB.getText().trim());
            int c = Integer.parseInt(txtSideC.getText().trim());
            double[] angles = getAngles(a, b, c);
            
            lblAngles.setText("Three angles are " + 
                               nf.format(angles[0]) + " degree, " +
                               nf.format(angles[1]) + " degree and " +
                               nf.format(angles[2]) + " degree");
            lblArea.setText("Area of the triangle is " +
                             nf.format(getArea(a, b, c)) + " " + command);
            String s = isRightTriangle(angles) ? "" : "not ";
            lblRightAngle.setText("It is " + s + "a right triangle");
        }
    
        private void setupGUIComponents() {
            // initiaze the components
            Label lblInstructions =
                new Label("Enter the length of the sides of a triangle");
            Label lblSideA = new Label("a");  txtSideA = new TextField(5);
            Label lblSideB = new Label("b");  txtSideB = new TextField(5);
            Label lblSideC = new Label("c");  txtSideC = new TextField(5);
            Label lblSelect = new Label("Select unit:");
            Button btnCM = new Button("cm");
            Button btnM = new Button("m");
            Button btnKM = new Button("km");
            lblAngles = new Label();
            lblArea = new Label();
            lblRightAngle = new Label();
    
            // add action-listeners to the buttons
            btnCM.addActionListener(this); 
            btnM.addActionListener(this);
            btnKM.addActionListener(this);
    
            // allign the components to the frame
            lblInstructions.setBounds(100,10,250,20);
            lblSideA.setBounds(100,35,20,20); txtSideA.setBounds(220,35,115,20);
            lblSideB.setBounds(100,55,20,20); txtSideB.setBounds(220,55,115,20);
            lblSideC.setBounds(100,75,20,20); txtSideC.setBounds(220,75,115,20);
            lblSelect.setBounds(130,100,70,20);
            btnCM.setBounds(210,100,30,20); 
            btnM.setBounds(245,100,30,20);
            btnKM.setBounds(280,100,30,20);
            lblAngles.setBounds(20,140,410,20);
            lblArea.setBounds(20,165,410,20);
            lblRightAngle.setBounds(20,190,410,20);
            
            // add the components to the frame
            add(lblInstructions);
            add(lblSideA);  add(txtSideA);
            add(lblSideB);  add(txtSideB);
            add(lblSideC);  add(txtSideC);
            add(lblSelect); add(btnCM); add(btnM); add(btnKM);
            add(lblAngles); add(lblArea); add(lblRightAngle);
        }
        
        private double[] getAngles(int a, int b, int c) {
            // create an array to store the 3 angles
            double[] angles = new double[3];
            double radians;
    
            // cast all the int values to double
            double dA=(double)a, dB=(double)b, dC=(double)c;
            
            // angle A in radians = cos^-1 (b^2 + c^2 - a^2 / 2bc)
            // and then convert the radians to degrees
            radians = Math.acos((dB*dB + dC*dC - dA*dA) / (2.0*dB*dC));
            angles[0] = radians * 180.0 / Math.PI;
            
            // angle B in radians = cos^-1 (a^2 + c^2 - b^2 / 2ac)
            // and then convert the radians to degrees
            radians = Math.acos((dA*dA + dC*dC - dB*dB) / (2.0*dA*dC));
            angles[1] = radians * 180.0 / Math.PI;
            
            // angle C in degrees = 180 - degrees A - degrees B
            angles[2] = 180.0 - angles[0] - angles[1];
    
            // return the 3 angles
            return angles;
        }
    
        private double getArea(int a, int b, int c) {
            // Heron's formula
            // s = (a + b + c)/2
            // area = sqrt( s(s - a)(s - b)(s - c) )
            double s = (a + b + c)/2.0;
            double area = Math.sqrt(s*(s-a)*(s-b)*(s-c));
            return area;
        }
    
        private boolean isRightTriangle(double[] angles) {
            for(int j = 0; j < angles.length; j++) {
                if(Math.abs(angles[j] - 90.0) < 0.05)
                    return true;
            }
            return false;
        }
    }

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