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62 lines
1.8 KiB
Java
62 lines
1.8 KiB
Java
Simple Mathematical Calculations 2
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import java.awt.*;
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import java.awt.event.*;
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// Java extension packages
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import javax.swing.*;
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public class Points extends JApplet implements ActionListener {
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JTextField x1Input, x2Input, y1Input, y2Input;
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JLabel labelX1, labelY1, labelX2, labelY2;
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// set up GUI components
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public void init()
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{
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labelX1 = new JLabel( "Enter X1: " );
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labelY1 = new JLabel( "Enter Y1: " );
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labelX2 = new JLabel( "Enter X2: " );
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labelY2 = new JLabel( "Enter Y2: " );
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x1Input = new JTextField( 4 );
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x2Input = new JTextField( 4 );
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y1Input = new JTextField( 4 );
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y2Input = new JTextField( 4 );
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y2Input.addActionListener( this );
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Container container = getContentPane();
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container.setLayout( new FlowLayout() );
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container.add( labelX1 );
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container.add( x1Input );
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container.add( labelY1 );
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container.add( y1Input );
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container.add( labelX2 );
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container.add( x2Input );
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container.add( labelY2 );
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container.add( y2Input );
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}
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// display distance between user input points
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public void actionPerformed( ActionEvent e )
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{
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double x1, y1, x2, y2;
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// read in two points
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x1 = Double.parseDouble( x1Input.getText() );
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y1 = Double.parseDouble( y1Input.getText() );
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x2 = Double.parseDouble( x2Input.getText() );
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y2 = Double.parseDouble( y2Input.getText() );
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double theDistance = distance( x1, y1, x2, y2 );
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showStatus( "Distance is " + theDistance );
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}
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// calculate distance between two points
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public double distance( double x1, double y1,
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double x2, double y2 )
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{
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return Math.sqrt( Math.pow( ( x1 - x2 ), 2 ) +
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Math.pow( ( y1 - y2 ), 2 ) );
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}
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} // end class Points
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