OK - here are a ..few changes.
import java.awt.*;import java.awt.image.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;public class JavaPaintUI extends Jframe { private BufferedImage canvas;public JavaPaintUI() { initComponents();} //this was moved from the overriden paintComponent() // instead it update the canvas BufferedImage and calls repaint() public void updateCanvas() { Graphics2D g2d = canvas.createGraphics(); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); g2d.setPaint( getColor() ); if (tool == 1) { g2d.fillOval(currentX - ((int) value / 2), currentY - ((int) value / 2), (int) value, (int) value); } else if (tool == 2) { g2d.setStroke(new BasicStroke((float) value, BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND)); g2d.drawLine(oldX, oldY, currentX, currentY); g2d.setStroke(new BasicStroke(1.0f)); } repaint(); } // used in both the updateCanvas and 'clear' method. private Color getColor() { Color c = null; if(color==1) c = Color.black; else if(color==2) c = Color.gray; else if(color==3) c = Color.white; else if(color==4) c = Color.red; else if(color==5) c = Color.green; else if(color==6) c = Color.blue; return c; }// <editor-fold defaultstate="collapsed" desc="Generated Code">private void initComponents() { canvas = new BufferedImage(600,400,BufferedImage.TYPE_INT_RGB); buttonGroup1 = new ButtonGroup(); buttonGroup2 = new ButtonGroup(); jPanel4 = new JPanel(); jRadioButton9 = new JRadioButton(); jRadioButton10 = new JRadioButton(); jSlider2 = new JSlider(); jLabel1 = new JLabel(); jPanel2 = new JPanel(new GridBagLayout()); JLabel canvasLabel = new JLabel(new ImageIcon(canvas)); jPanel2.add(canvasLabel, null); jPanel3 = new JPanel(); jRadioButton3 = new JRadioButton(); jRadioButton4 = new JRadioButton(); jRadioButton5 = new JRadioButton(); jRadioButton6 = new JRadioButton(); jRadioButton7 = new JRadioButton(); jRadioButton8 = new JRadioButton(); jButton1 = new JButton(); jButton2 = new JButton(); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setTitle("JavaPaint ~ Nick R"); jPanel4.setBorder(BorderFactory.createTitledBorder("Tool")); buttonGroup1.add(jRadioButton9); jRadioButton9.setText("Pen"); jRadioButton9.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton9ActionPerformed(evt); } }); buttonGroup1.add(jRadioButton10); jRadioButton10.setText("Line"); jRadioButton10.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton10ActionPerformed(evt); } }); jSlider2.setMajorTickSpacing(10); jSlider2.setMaximum(51); jSlider2.setMinimum(1); jSlider2.setMinorTickSpacing(5); jSlider2.setPaintTicks(true); jSlider2.addChangeListener(new ChangeListener() { public void stateChanged(ChangeEvent evt) { jSlider2StateChanged(evt); } }); jLabel1.setText("Stroke Size (Radius)"); GroupLayout jPanel4Layout = new GroupLayout(jPanel4); jPanel4.setLayout(jPanel4Layout); jPanel4Layout.setHorizontalGroup( jPanel4Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(jPanel4Layout.createSequentialGroup() .addContainerGap() .addGroup(jPanel4Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addComponent(jRadioButton9) .addComponent(jRadioButton10)) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 51, Short.MAX_VALUE) .addGroup(jPanel4Layout.createParallelGroup(GroupLayout.Alignment.TRAILING) .addComponent(jLabel1) .addComponent(jSlider2, GroupLayout.PREFERRED_SIZE, 150, GroupLayout.PREFERRED_SIZE)) .addContainerGap()) ); jPanel4Layout.setVerticalGroup( jPanel4Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(jPanel4Layout.createParallelGroup(GroupLayout.Alignment.TRAILING) .addComponent(jSlider2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE) .addGroup(jPanel4Layout.createSequentialGroup() .addGroup(jPanel4Layout.createParallelGroup(GroupLayout.Alignment.baseLINE) .addComponent(jRadioButton9) .addComponent(jLabel1)) .addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jRadioButton10))) ); jPanel2.setBackground(new Color(128, 40, 128)); jPanel2.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED)); // add the listeners to the label that contains the canvas buffered image canvasLabel.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent evt) { jPanel2MousePressed(evt); } public void mouseReleased(MouseEvent evt) { jPanel2MouseReleased(evt); } }); canvasLabel.addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent evt) { jPanel2MouseDragged(evt); } }); // this part of the pre was not helping. // either layout a container or custom paint it. // only attempt both if you are very confident of what you are doing. jPanel3.setBorder(BorderFactory.createTitledBorder("Color")); buttonGroup2.add(jRadioButton3); jRadioButton3.setText("Red"); jRadioButton3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton3ActionPerformed(evt); } }); buttonGroup2.add(jRadioButton4); jRadioButton4.setText("Black"); jRadioButton4.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton4ActionPerformed(evt); } }); buttonGroup2.add(jRadioButton5); jRadioButton5.setText("Gray"); jRadioButton5.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton5ActionPerformed(evt); } }); buttonGroup2.add(jRadioButton6); jRadioButton6.setText("Green"); jRadioButton6.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton6ActionPerformed(evt); } }); buttonGroup2.add(jRadioButton7); jRadioButton7.setText("White"); jRadioButton7.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton7ActionPerformed(evt); } }); buttonGroup2.add(jRadioButton8); jRadioButton8.setText("Blue"); jRadioButton8.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jRadioButton8ActionPerformed(evt); } }); GroupLayout jPanel3Layout = new GroupLayout(jPanel3); jPanel3.setLayout(jPanel3Layout); jPanel3Layout.setHorizontalGroup( jPanel3Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(jPanel3Layout.createSequentialGroup() .addContainerGap() .addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.LEADING, false) .addComponent(jRadioButton3, GroupLayout.Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jRadioButton4, GroupLayout.Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, 66, Short.MAX_VALUE)) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED) .addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addComponent(jRadioButton5, GroupLayout.DEFAULT_SIZE, 55, Short.MAX_VALUE) .addComponent(jRadioButton6, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED) .addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.TRAILING, false) .addComponent(jRadioButton8, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jRadioButton7, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addContainerGap()) ); jPanel3Layout.setVerticalGroup( jPanel3Layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup() .addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.baseLINE) .addComponent(jRadioButton4) .addComponent(jRadioButton5) .addComponent(jRadioButton7)) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 3, Short.MAX_VALUE) .addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.baseLINE) .addComponent(jRadioButton3) .addComponent(jRadioButton6) .addComponent(jRadioButton8))) ); jButton1.setText("Clear"); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setText("about"); jButton2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jButton2ActionPerformed(evt); } }); GroupLayout layout = new GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addComponent(jPanel2, GroupLayout.Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addGroup(layout.createSequentialGroup() .addComponent(jPanel4, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE) .addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jPanel3, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addComponent(jButton2, GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE) .addComponent(jButton1, GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING, false) .addGroup(layout.createSequentialGroup() .addGap(4, 4, 4) .addComponent(jButton1, GroupLayout.PREFERRED_SIZE, 30, GroupLayout.PREFERRED_SIZE) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton2, GroupLayout.PREFERRED_SIZE, 28, GroupLayout.PREFERRED_SIZE)) .addComponent(jPanel4, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jPanel3, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED) .addComponent(jPanel2, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addContainerGap()) ); pack();}// </editor-fold>// clear the canvas using the currently selected color.private void jButton1ActionPerformed(ActionEvent evt) { System.out.println("You cleared the canvas."); Graphics g = canvas.getGraphics(); g.setColor( getColor() ); g.fillRect(0,0,canvas.getWidth(),canvas.getHeight()); repaint();}private void jButton2ActionPerformed(ActionEvent evt) { JOptionPane.showMessageDialog(null, "JavaPaint is a simple java based painting application." + " Nick R 5/22/2011", "about", JOptionPane.INFORMATION_MESSAGE);}int currentX, currentY, oldX, oldY;private void jPanel2MouseDragged(MouseEvent evt) { currentX = evt.getX(); currentY = evt.getY(); updateCanvas(); if (tool == 1) { oldX = currentX; oldY = currentY; System.out.println("Using pen at " + currentX + ", " + currentY); }}private void jPanel2MousePressed(MouseEvent evt) { oldX = evt.getX(); oldY = evt.getY(); if (tool == 2) { currentX = oldX; currentY = oldY; }}//Tool Selection//int tool = 0;private void jRadioButton9ActionPerformed(ActionEvent evt) { tool = 1; System.out.println("Using the pen tool.");}private void jRadioButton10ActionPerformed(ActionEvent evt) { tool = 2; System.out.println("Using the line tool.");}//Slider Properties//double value = 5;private void jSlider2StateChanged(ChangeEvent evt) { value = jSlider2.getValue(); System.out.println(value);}//COLOR CODE//int color = 1;private void jRadioButton4ActionPerformed(ActionEvent evt) { color = 1; // Black}private void jRadioButton5ActionPerformed(ActionEvent evt) { color = 2; // Grey}private void jRadioButton7ActionPerformed(ActionEvent evt) { color = 3; // White}private void jRadioButton3ActionPerformed(ActionEvent evt) { color = 4; // Red}private void jRadioButton6ActionPerformed(ActionEvent evt) { color = 5; // Green}private void jRadioButton8ActionPerformed(ActionEvent evt) { color = 6; // Blue}//mouse released//private void jPanel2MouseReleased(MouseEvent evt) { currentX = evt.getX(); currentY = evt.getY(); if (tool == 2) { System.out.println("line from " + oldX +", "+ oldY + " to " + currentX + ", " + currentY); }}//set ui visible//public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { public void run() { new JavaPaintUI().setVisible(true); } });}// Variables declaration - do not modifyprivate ButtonGroup buttonGroup1;private ButtonGroup buttonGroup2;private JButton jButton1;private JButton jButton2;private JLabel jLabel1;public JPanel jPanel2;private JPanel jPanel3;private JPanel jPanel4;private JRadioButton jRadioButton10;private JRadioButton jRadioButton3;private JRadioButton jRadioButton4;private JRadioButton jRadioButton5;private JRadioButton jRadioButton6;private JRadioButton jRadioButton7;private JRadioButton jRadioButton8;private JRadioButton jRadioButton9;public JSlider jSlider2;// End of variables declaration}欢迎分享，转载请注明来源：内存溢出
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