CODEWITHSUNDEEP
javagraphicsevent-handlingjframeactionlistener
user1789951
user1789951

Reputation: 661

drawing graphics and event handling

I am trying to write a program that draws a circle on the screen then gives you 3 buttons (red, yellow, and Green) and clicking the button changes the fill color of the circle accordingly.

I think I'm close, I just don't know how actually to create a method that will draw the circle and change the color. I can write a method to draw and fill a circle I'm just having problems merging it with jbutton

This is what i have so far:

(ignore the unused imports)

took a different approach, i don't know if it's any better. My buttons display and everything just having problems changing the color. Actually right now i cant even display a circle. i know i need to call repaint(); in my eventhandler im just not sure how to do it. This is due Sunday ive spent so many hours watching videos and reading example i just cant get mine to work. I'm sure its stupid simple but it frustrating that heck out of me! 

  public class test3 extends JPanel {

JRadioButton RED, YELLOW, GREEN; 
Color currentColor;          


public void paintComponent(Graphics g){

    currentColor= Color.RED; 

        super.paintComponent(g);
        this.setBackground(Color.WHITE);

        g.setColor(currentColor);
        g.fillOval(50, 50, 100, 100);    
       }






public static void main(String[] args) {

  test3 frame = new test3();
  frame.setSize(500,500);

  frame.setVisible(true);
    }

public test3 (){

JPanel jpRadioButtons=new JPanel();
jpRadioButtons.setLayout(new GridLayout(1,1));
jpRadioButtons.add(RED=new JRadioButton("RED"));
jpRadioButtons.add(GREEN=new JRadioButton("GREEN"));
jpRadioButtons.add(YELLOW=new JRadioButton("YELLOW"));

add(jpRadioButtons, BorderLayout.SOUTH);


ButtonGroup group=new ButtonGroup();
group.add(RED);
group.add(YELLOW);
group.add(GREEN);

GREEN.addActionListener(new ActionListener()
{
    public void actionPerormed(ActionEvent e)
    {        

        currentColor = Color.GREEN;
     repaint();           
    }
      });

   }
}

Upvotes: 0

Views: 1227

Answers (1)

Simon
Simon

Reputation: 1851

  1. Introduce a class variable/property/... with the current color of the circle.
  2. Set this variable in your eventhandler
  3. Also call "repaint();" in your eventhandler
  4. Override the paintComponent() method and make it draw a circle in the color, which you can read from the class variable.

Your paintComponent(Graphics g) might look something like this:

@Override
void paintComponent(Graphics g)
{
  g.setColor(currentColor);
  g.drawOval(50,50,100,100);
}

Upvotes: 1

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