passing parameters to graphics

I'm working on an application, and I want to pass the parameters int x, int y, int width, int height to a method (in a class other than main) to draw a square using those parameters. I have the method public void draw( Graphics g ) and I want to add those parameters (int x, int y, int width, int height) to the method, how would I do this? I tried making public void draw(Graphics g, int x, int y, int width, int height), but it didn't work.

You have replies to your previous threads that you've not yet acknowledged. Many here, me included, may hold off answering any more of your questions until they know that you actually read them.
Best of luck.

edit: in fact in several threads:
http://www.java-forums.org/advanced-...ject-java.html
http://www.java-forums.org/new-java/...hile-loop.html
http://www.java-forums.org/xml/22674...-data-url.html
http://www.java-forums.org/advanced-...de-string.html
http://www.java-forums.org/new-java/...in-method.html

We are volunteers after all, and your thanks are our only payment. Also it is simple common courtesy.

Again, best of luck.

oh crud sorry I start threads and often forget about them... thanks for reminding me

Thanks for your responses.

Back to your problem: Say you've got a JPanel called DrawRectPanel that draws a rectangle from 10, 10 to a variable width, say rectW and a variable height, say rectH, with a paintComponent method that looks similar to this:

Code:

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  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawRect(10, 10, rectW, rectH);
  }

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The best way to do this (that I know of) is to make rectW and rectH class variables with public setter methods. Then you can change the rectW and rectH states via the setter methods and call repaint on the panel.

Here's an example of what I meant:

Code:

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import java.awt.*;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

// main method containing class that creates the JFrame and ties all together
public class GraphicsParam {
  private static final Dimension DR_PANEL_SIZE = new Dimension(220, 220);

  private static void createAndShowUI() {
    // the JPanel that draws the rectangle
    DrawRectPanel drawRectPanel = new DrawRectPanel();
    drawRectPanel.setPreferredSize(DR_PANEL_SIZE);
   
    // the JPanel/class that controls the drawing panel above
    final DrawPanelController gppController =
      new DrawPanelController(drawRectPanel);
   
    JFrame frame = new JFrame("Graphics Parameters");
    frame.getContentPane().add(drawRectPanel, BorderLayout.CENTER);
    frame.getContentPane().add(gppController, BorderLayout.SOUTH);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        createAndShowUI();
      }
    });
  }
}

class DrawRectPanel extends JPanel {
  public static final int INSET = 10;
  private int rectW = 100;
  private int rectH = 100;
 
  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawRect(INSET, INSET, rectW, rectH);
  }

  public void setRectW(int rectW) {
    this.rectW = rectW;
  }

  public void setRectH(int rectH) {
    this.rectH = rectH;
  }

}

class DrawPanelController extends JPanel {
  private DrawRectPanel drPanel;
  private JSlider widthSlider = new JSlider(0, 200, 100);
  private JSlider heightSlider = new JSlider(0, 200, 100);
 
  public DrawPanelController(DrawRectPanel drPanel) {
    this.drPanel = drPanel;
   
    setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
    add(new JLabel("Width"));
    add(widthSlider);
    add(new JLabel("Height"));
    add(heightSlider);
   
    SliderListener sliderListener = new SliderListener();
    widthSlider.addChangeListener(sliderListener);
    heightSlider.addChangeListener(sliderListener);
  }
 
  private class SliderListener implements ChangeListener {
    public void stateChanged(ChangeEvent e) {
      JSlider slider = (JSlider) e.getSource();
      if (slider == widthSlider) {
        drPanel.setRectW(slider.getValue());
      } else {
        drPanel.setRectH(slider.getValue());
      }
      drPanel.repaint();
    }
  }
}

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thanks, that helps alot :)

What does the @Override do???

Quote:

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Originally Posted by jforce93

thanks, that helps alot

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You're quite welcome.

Quote:

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What does the @Override do???

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It tells the compiler to warn me if the method that follows is not a true override. See what happens if you use the @Override annotation and change this line:

Code:

---

protected void paintComponent(Graphics g) {

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to this:

Code:

---

private void paintComponent(Graphics g) {

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Now remove the @Override and see what happens. It will compile but paintComponent will never be called since it isn't a true override.