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POHelp making an eraser for a paint program in java
 

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  1. POHelp making an eraser for a paint program in java
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    <p>Making a very basic paint program for a class and one of the requirements is that we must make an eraser. Not sure how to do that, We are using a bufferedimage that is then getting pasted to our jframe. Any ideas on how this could be done/ any code examples? Someone told me to try clearRect but maybe I was just using it wrong but i could not get it to accept it. Any help / code examples would be great, here is my code, its all one class.</p> <pre><code> import javax.imageio.ImageIO; import javax.swing.*; import javax.swing.border.Border; import javax.swing.border.LineBorder; import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.*; public class PaintProgram extends JPanel implements MouseListener,ActionListener { public static int stroke, eraser = 0; private int xX1, yY1 , xX2, yY2, choice ; public static void main(String [] args) { new PaintProgram(); } PaintProgram() { JFrame frame = new JFrame("Paint Program"); frame.setSize(1200, 800); frame.setBackground(Color.WHITE); frame.getContentPane().add(this); JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu help = new JMenu("Help"); menuBar.add(help); JMenuItem about = new JMenuItem("About"); help.add(about); about.addActionListener(this); JButton button1 = new JButton("Clear"); button1.addActionListener(this); JButton color = new JButton("Color"); color.addActionListener(this); JButton erase = new JButton("Erase?"); erase.addActionListener(this); JButton button2 = new JButton("Empty Rect"); button2.addActionListener(this); JButton button3 = new JButton("Filled oval"); button3.addActionListener(this); JButton button4 = new JButton("Filled Rect"); button4.addActionListener(this); JButton button5 = new JButton("Empty oval"); button5.addActionListener(this); JButton button6 = new JButton("Line"); button6.addActionListener(this); JRadioButton thin = new JRadioButton("Thin Line"); thin.addActionListener(this); JRadioButton medium = new JRadioButton("Medium Line"); medium.addActionListener(this); JRadioButton thick = new JRadioButton("Thick Line"); thick.addActionListener(this); ButtonGroup lineOption = new ButtonGroup( ); lineOption.add(thin); lineOption.add(medium); lineOption.add(thick); this.add(button1); this.add(color); this.add(erase); this.add(button2); this.add(button3); this.add(button4); this.add(button5); this.add(button6); this.add(thin); this.add(medium); this.add(thick); addMouseListener(this); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; if(grid == null){ int w = this.getWidth(); int h = this.getHeight(); grid = (BufferedImage)(this.createImage(w,h)); gc = grid.createGraphics(); gc.setColor(Color.BLUE); } g2.drawImage(grid, null, 0, 0); check(); } BufferedImage grid; Graphics2D gc; public void draw() { Graphics2D g = (Graphics2D)getGraphics(); int w = xX2 - xX1; if (w&lt;0) w = w *(-1); int h = yY2-yY1; if (h&lt;0) h= h*(-1); switch(choice) { case 1: check(); gc.drawRect(xX1, yY1, w, h); repaint(); break; case 2: check(); gc.drawOval(xX1, yY1, w, h); repaint(); break; case 3: check(); gc.drawRect(xX1, yY1, w, h); gc.fillRect(xX1, yY1, w, h); repaint(); break; case 4: check(); gc.drawOval(xX1, yY1, w, h); gc.fillOval(xX1, yY1, w, h); repaint(); break; case 5: if (stroke == 0) gc.setStroke(new BasicStroke (1)); if (stroke == 1) gc.setStroke(new BasicStroke (3)); if (stroke == 2) gc.setStroke(new BasicStroke (6)); gc.drawLine(xX1, yY1, xX2, yY2); repaint(); break; case 6: repaint(); Color temp = gc.getColor(); gc.setColor(Color.WHITE); gc.fillRect(0, 0, getWidth(), getHeight()); gc.setColor(temp); repaint(); break; case 7: if (eraser == 1) { gc.clearRect(xX1, yY1, w, h); } else { } break; } } public void check() { if (xX1 &gt; xX2) { int z = 0; z = xX1; xX1 = xX2; xX2 =z; } if (yY1 &gt; yY2) { int z = 0; z = yY1; yY1 = yY2; yY2 = z; } } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("Color")) { Color bgColor = JColorChooser.showDialog(this,"Choose Background Color", getBackground()); if (bgColor != null) gc.setColor(bgColor); } if (e.getActionCommand().equals("About")) { System.out.println("About Has Been Pressed"); JFrame about = new JFrame("About"); about.setSize(300, 300); JButton picture = new JButton(new ImageIcon("C:/Users/TehRobot/Desktop/Logo.png")); about.add(picture); about.setVisible(true); } if (e.getActionCommand().equals("Empty Rect")) { System.out.println("Empty Rectangle Has Been Selected~"); choice = 1; } if (e.getActionCommand().equals("Empty oval")) { System.out.println("Empty Oval Has Been Selected!"); choice = 2; } if (e.getActionCommand().equals("Filled Rect")) { System.out.println("Filled Rectangle Has Been Selected"); choice = 3; } if (e.getActionCommand().equals("Filled oval")) { System.out.println("Filled Oval Has Been Selected"); choice = 4; } if (e.getActionCommand().equals("Line")) { System.out.println("Draw Line Has Been Selected"); choice = 5; } if (e.getActionCommand().equals("Thin Line")) { stroke = 0; } if (e.getActionCommand().equals("Medium Line")) { stroke = 1; } if (e.getActionCommand().equals("Thick Line")) { stroke = 2; } if(e.getActionCommand().equals("Erase?")) { eraser = 1; choice = 7; } if (e.getActionCommand().equals("Clear")) { System.out.println("Clear All The Things!!!"); choice = 6; draw(); } } public void mouseExited(MouseEvent evt){} public void mouseEntered(MouseEvent evt){} public void mouseClicked(MouseEvent evt){} public void mousePressed(MouseEvent evt) { xX1 = evt.getX(); yY1= evt.getY(); } public void mouseReleased(MouseEvent evt) { xX2 =evt.getX(); yY2=evt.getY(); draw(); eraser = 0; } </code></pre> <p>}</p>
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    1. COThe simplest eraser is just a paintbrush that draws using the background color. 'erasing' the foreground.
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    2. COIf this is homework please use the homework tag, you can drop one opf the jpanel or jframe.
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      1. USMiserable Variable
    3. COMarc, that sounds awesome, any examples of how to make a paintbrush?
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