Databases
StackOverflow2013
Postsdbo
POGraphics plain 2D objects are not rendered while an action occurred
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGraphics plain 2D objects are not rendered while an action occurred
    primarykey
    data
    text
    <p>I am designing a game in Swing. Currently I am designing the maze for this game. The maze is generated by using Depth First Search algorithm. In my main JFrame, I have some JPanel. One JPanel, named mazePanel contains the maze. There are some other JPanel also, which contains the JButton for controlling. Following is the mazePanel code. </p> <pre><code>import java.awt.Graphics; import javax.swing.BorderFactory; import javax.swing.JPanel; public class MazePanel extends JPanel { private MazeGenerator mazeGenerator; private boolean startNewMaze = false; public MazePanel() { setBorder(BorderFactory.createTitledBorder("Maze")); setToolTipText("This is the maze"); } public void addNewMaze() { startNewMaze = true; mazeGenerator = new MazeGenerator(); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); if (startNewMaze) { mazeGenerator.generate(g); startNewMaze = false; } } } </code></pre> <p>There is one JButton, which calls the method mazePanel.addNewMaze() and set the Boolean startNewMaze to true. After setting the startNewMaze, maze should be generated. i.e. mazeGenerator.generate(g) is inside if() condition. Method mazeGenerator.generate(g) recursively draw the random maze. That is why I don’t want to run this method not more than once.</p> <p>Up to this everything is looking fine. But while I am running the main JFrame and clicks on the JButton, maze is not rendered in the mazePanel. Sometimes when I minimize and maximize the JFrame, maze rendered (might be because of repaint() occur). Even if I comment mazeGenerator.generate(g) inside if() condition and put some g.drawString(). The string is not rendered while action performed (i.e.Pressing JButton).</p> <p>Where is the problem? Please help.</p> <p>Thank you.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USRavi Joshi
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POGraphics plain 2D objects are not rendered while an action occurred
      1. This table or related slice is empty.
      1. VTUpMod
    1. COdon't ever change the state of any component while painting it. Instead, change the state and then trigger the revalidation/painting, f.i. in addNewMaze
      singulars
      1. POGraphics plain 2D objects are not rendered while an action occurred
      1. USkleopatra
    2. COHi kleopatra. Thank you for your kind response. It would be best if you can explain me a little bit.
      singulars
      1. POGraphics plain 2D objects are not rendered while an action occurred
      1. USRavi Joshi
    3. COno idea what there might be to explain, beyond "move the maze.generate() from the paintComponent to some other method, f.i. into addNewMaze"
      singulars
      1. POGraphics plain 2D objects are not rendered while an action occurred
      1. USkleopatra
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload