Chapter 14: Problem 21

In the paint or paintComponent method, what should be done before anything else?

Short Answer

Expert verified

Answer: Before any custom drawing or painting operations are performed in the paintComponent method, the first thing to do is to call the super method, which ensures that the component's background and any borders are properly rendered. The method "super.paintComponent()" is used for this purpose.

Step by step solution

Understand the paintComponent method

The paintComponent method is part of the Java Swing library and is responsible for rendering graphics on a JPanel or other components. It is typically overridden to customize the appearance of the component.

Call the super method

Before any custom drawing or painting is done, the first thing to do in the paintComponent method is to call the super method, which ensures that the component's background and any borders are properly rendered. The method "super.paintComponent()" is used for this purpose.

Clear the background

Although this step is optional, it is a good practice to clear the background before drawing any graphics on it. This can be done by calling the “clearRect” method on the Graphics object provided as a parameter, passing in the component's width and height.

Perform custom drawing

After ensuring that the super.paintComponent is called, you can perform any custom drawing or painting operations on the Graphics object. Here is an example paintComponent method: ```java @Override protected void paintComponent(Graphics g) { // Call the super method super.paintComponent(g); // Clear the background g.clearRect(0, 0, getWidth(), getHeight()); // Perform custom drawing g.setColor(Color.RED); g.fillRect(50, 50, 100, 100); } ``` In the example above, before any drawing operations are performed, the super.paintComponent(g) method is called, and the background is cleared. After that, a red square is drawn on the component.

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In the paint or paintComponent method, what should be done before anything else?

Short Answer

Step by step solution

Understand the paintComponent method

Call the super method

Clear the background

Perform custom drawing

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