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;
/** Creates new form JavaPaintUI */
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 code was not helping.
// either layout a container or custom paint it.
// only attempt both if you are very confident of what you are doing.
/*
GroupLayout jPanel2Layout = new GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGap(0, 596, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGap(0, 357, Short.MAX_VALUE)
);
*/
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())
);
