Java Programming Code Examples

Paint Shapes and Text of different colors and fonts import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class Painter2 extends JFrame { private int topX, topY, width, fontSize, height, bottomX, bottomY, shape; private boolean clear, textOn, filled; private Color drawingColor; private String font; private JTextField text; private JPanel panel1, panel2, panel3, panel4; private JRadioButton ovalBox, rectBox, lineBox; private ButtonGroup shapeGroup; private JCheckBox fillBox; private JComboBox colorList, fontList, sizeList; private JButton clearButton; private String colorNames[] = { "Black", "Green", "Blue", "Red", "Cyan" }; private Color colors[] = { Color.black, Color.green, Color.blue, Color.red, Color.cyan }; private String fontNames[] = { "Serif", "SansSerif", "Monospaced" }; private String sizeNames[] = { "9", "10", "22", "72" }; private int sizes[] = { 9, 10, 22, 72 }; private final int OVAL = 1, LINE = 2, RECT = 3; private ToolWindow tools; // Painter2 constructor public Painter2() { super( "Painting Window" ); addMouseListener( new MouseHandler() ); // set defaults for painting drawingColor = Color.black; shape = OVAL; font = "Serif"; fontSize = 9; setDefaultCloseOperation( EXIT_ON_CLOSE ); setBackground( Color.white ); setSize( 300, 300 ); show(); // create new ToolWindow tools = new ToolWindow(); } // end constructor // paint the new window. super is not called so // that the previous images will not be erased. public void paint( Graphics g ) { g.setColor( drawingColor ); // draw text if ( textOn ) { g.setFont( new Font( font, Font.PLAIN, fontSize ) ); g.drawString( text.getText(), topX, topY ); textOn = false; return; } // end if statement // set shape's top left coordinates if ( shape != LINE ) { topX = Math.min( topX, bottomX ); topY = Math.min( topY, bottomY ); } // end if statement // draw filled shape if ( filled && shape != LINE ) switch ( shape ) { case OVAL: g.fillOval( topX, topY, width, height ); break; case RECT: g.fillRect( topX, topY, width, height ); break; } // end switch statement // draw unfilled shapes else switch ( shape ) { case OVAL: g.drawOval( topX, topY, width, height ); break; case LINE: g.drawLine( topX, topY, bottomX, bottomY ); break; case RECT: g.drawRect( topX, topY, width, height ); break; } // ens switch statement // clear background if ( clear == true ) { g.setColor( Color.white ); g.fillRect( 0, 0, getSize().width, getSize().height ); clear = false; } // end if statement } // end method paint // inner class for window containing GUI private class ToolWindow extends JFrame { // ToolWindow constructor public ToolWindow() { super( "Tool Window" ); // set up to edit text text = new JTextField( "Text", 25 ); text.addActionListener( // anonymous inner class to handle text drawing new ActionListener () { public void actionPerformed( ActionEvent event ) { textOn = true; repaint(); } // end actionPerformed method } // end anonymous inner class ); // end call to addActionListener // set up to choose font fontList = new JComboBox( fontNames ); fontList.setMaximumRowCount( 3 ); fontList.addItemListener( // anonymous inner class to select font new ItemListener() { // change font public void itemStateChanged( ItemEvent event ) { font = fontNames[ fontList.getSelectedIndex() ]; } // end itemStateChanged method } // end anonymous inner class ); // end call to addItemListener // set up to choose font size sizeList = new JComboBox( sizeNames ); sizeList.setMaximumRowCount( 3 ); sizeList.addItemListener( // anonymous inner class to select font size new ItemListener() { // change font size public void itemStateChanged( ItemEvent event ) { fontSize = sizes[ sizeList.getSelectedIndex() ]; } // end itemStateChanged method } // end anonymous inner class ); // end call to addItemListener // set up to choose color colorList = new JComboBox( colorNames ); colorList.setMaximumRowCount( 3 ); colorList.addItemListener( // anonymous inner class to select color new ItemListener() { // change color public void itemStateChanged( ItemEvent event ) { drawingColor = colors[ colorList.getSelectedIndex() ]; } // end itemStateChanged method } // end anonymous inner class ); // end call to addItemListener // set up clear button clearButton = new JButton( "Clear" ); clearButton.addActionListener( new ClearButtonHandler() ); // set up to choose filled fillBox = new JCheckBox( "Filled" ); FillBoxHandler fillHandle = new FillBoxHandler(); fillBox.addItemListener( fillHandle ); // set up to choose shapes ovalBox = new JRadioButton( "Oval", true ); lineBox = new JRadioButton( "Line", false ); rectBox = new JRadioButton( "Rectangle", false ); RadioButtonHandler handler = new RadioButtonHandler(); ovalBox.addItemListener( handler ); lineBox.addItemListener( handler ); rectBox.addItemListener( handler ); shapeGroup = new ButtonGroup(); shapeGroup.add(ovalBox); shapeGroup.add(lineBox); shapeGroup.add(rectBox); // set up GUI layout panel1 = new JPanel(); panel2 = new JPanel(); panel3 = new JPanel(); panel4 = new JPanel(); panel1.setLayout( new GridLayout( 1, 4 ) ); panel2.setLayout( new GridLayout( 1, 3 ) ); panel3.setLayout( new FlowLayout() ); panel4.setLayout( new FlowLayout() ); panel1.add( ovalBox ); panel1.add( lineBox ); panel1.add( rectBox ); panel1.add( fillBox ); panel2.add( new JScrollPane( colorList ) ); panel2.add( new JScrollPane( fontList ) ); panel2.add( new JScrollPane( sizeList ) ); panel3.add( text ); panel4.add( clearButton ); Container container = getContentPane(); container.setLayout( new FlowLayout() ); container.add( panel1 ); container.add( panel2 ); container.add( panel3 ); container.add( panel4 ); setDefaultCloseOperation( EXIT_ON_CLOSE ); setSize( 350, 175 ); setLocation( 300, 0 ); setVisible( true ); } // end ToolWindow constructor } // end inner class ToolWindow // set coordinate and dimension values private class MouseHandler extends MouseAdapter { public void mousePressed( MouseEvent event ) { topX = event.getX(); topY = event.getY(); } // end mousePressed method public void mouseReleased( MouseEvent event ) { bottomX = event.getX(); bottomY = event.getY(); width = Math.abs( topX - bottomX ); height = Math.abs( topY - bottomY ); repaint(); } // end mouseReleased method } // end inner class MouseHandler // clear background private class ClearButtonHandler implements ActionListener { public void actionPerformed( ActionEvent event ) { clear = true; repaint(); } // end actionPerformed method } // end inner class ClearButtonHandler // determine which type of shape to draw private class RadioButtonHandler implements ItemListener { public void itemStateChanged( ItemEvent event ) { if ( event.getSource() == ovalBox ) shape = OVAL; else if ( event.getSource() == lineBox ) shape = LINE; else if ( event.getSource() == rectBox ) shape = RECT; } // end itemStateChanged method } // end inner class RadioButtonHandler // determine if shape should be filled private class FillBoxHandler implements ItemListener { public void itemStateChanged( ItemEvent event ) { if ( event.getStateChange() == ItemEvent.SELECTED ) filled = true; else filled = false; } // end ItemStateChanged method } // end inner class FillBoxHandler // execute application public static void main( String args[] ) { Painter2 application = new Painter2(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } // end main method } // end class Painter2