Thread: JGrid and JButton issues.

Hello everyone. I'm working on a project to create some flower petals into a 3x3 grid. Without using the grid I could increment the number of petals on the flower using the JButtons to increment or decrement them. My problem is that when I apply the flower to the 3x3 grid, the flower petals will not change when i use the JButtons. Im using three classes to achieve a solution to my problem.


flower.JPG


Flowerc.java creates one single drawing of the flower.

// Import the basic graphics classes.
import java.awt.*;
import javax.swing.*;
 
 
public class Flowerc extends JPanel{
 
	int petal = 0;
	//class called increment
    public void inc(int i){
       	petal+=i; 
    	repaint();
    	System.out.println(petal);}
 
    public Flowerc(int petaln){
    	 super();
    	 setPreferredSize (new Dimension(100, 100));
 
 
    	petal = petaln;
 
    }
 
    public void paintComponent(Graphics g){
    super.paintComponent(g);
    Graphics2D g2d=(Graphics2D)g; // Create a Java2D version of g.
	int s = 100;
	int x = 0;
	int y = 0;
	int halfs = s/2;
 
 
	//DRAWING 2x2 GRID
	for (x = 0; x<s; x+=halfs){
		for (y = 0; y<s; y+=halfs){
		g2d.drawRect(x, y, halfs, halfs);
	}}
 
	double ang_inc;
 
		switch (petal) {
  case 0: 
    ang_inc = 90;
    break;
  case 1: 
    ang_inc = 45;
    break;
  case 2: 
    ang_inc = 22.5;
    break;
  default: 
    ang_inc = 361;
}
int width = 10;
int length = 30;
 
 
         g2d.translate(halfs, halfs); // Translate the center of our coordinates.
 
 		//draw petals      
         for(double i = 0; i <360; i += ang_inc){
 
         g2d.rotate(Math.toRadians(i));  // Rotate the image by i radian.
         g2d.drawOval(-width/2, width, width, length);}
    }
 
//MAIN CLASS
///* 
 	   public static void main(String arg[]){
       JFrame frame = new JFrame("RotateImage");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 //      frame.setSize(300,300);
 
       Flowerc panel = new Flowerc(1);
 
       frame.setContentPane(panel);  
 
       frame.pack();
       frame.setVisible(true);  }
//*/    
}

gridgrid.java creates a 3x3 grid and adds the flowers in it

import java.awt.*;
import javax.swing.*;
 
public class gridgrid extends JPanel
{
	int flowerclasspetal = 0;
 
 
	    public void incr(int i){
       	flowerclasspetal+=i; 
 //   	repaint();
    	System.out.println(flowerclasspetal);
	    }
 
 
 
   public gridgrid(int flowerclasspetaln)
   {
   	flowerclasspetal = flowerclasspetaln;
 
 
      setLayout (new GridLayout (3, 3));
 
      setBackground (Color.green);
 
	for (int i = 0; i <9; i ++){
		add (new Flowerc(flowerclasspetal));
	}
 
      }
 
   public static void main (String[] args)
   {
      JFrame frame = new JFrame ("Layout Manager Demo");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
 
      gridgrid panel = new gridgrid(1);
//     
 
      frame.getContentPane().add(panel);
      frame.pack();
      frame.setVisible(true);
   }
}

flowerPanel.java tries to incooperate the JButtons working which doesnt seem to work at the moment.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
 
public class flowerPanel extends JPanel
{
   private JButton but1; 
   private JButton but2;
 
 
   private JLabel label1;
   private JLabel label2;
   private int count;
   private 	Flowerc flower = new Flowerc(0);
   private gridgrid flowergrid = new gridgrid(0);
 
   public flowerPanel ()
   {
 
//set buttons n listener
 
      but1 = new JButton ("+");
      but1.addActionListener (new ButtonListener(1));
      but2 = new JButton ("-");
      but2.addActionListener (new ButtonListener(-1));
 
//set labels
      label1 = new JLabel ("Add Petals");
 
//add to panelz
	add (label1);
	add (but1);
	add (but2);
	add (flowergrid);
 
 
      setPreferredSize (new Dimension(400, 400));
      setBackground (Color.gray);
}
 
   //*****************************************************************
   //  Represents a listener for button push (action) events.
   //*****************************************************************
   private class ButtonListener implements ActionListener
   {
      private int inc;
      ButtonListener(int i){
      	inc =i;
      }
 
      public void actionPerformed (ActionEvent event)
      {
       flowergrid.incr(inc);
      }
   }
 
   public static void main (String[] args)
   {
      JFrame frame = new JFrame ("flower");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
 
      frame.getContentPane().add(new flowerPanel());
 
      frame.pack();
      frame.setVisible(true);
   }
 
}

flower petals will not change when i use the JButtons.

How does the paintComponent method get information about how to change what it is drawing?

I can't figure out how to update that information. If you can point me in the right direction? Thank you.

You need to understand how your program is executing. Try debugging your code by Adding some printlns to all the methods to show when they are being called and what the values of the variables are when they are called. Especially the number of petals to be displayed. Look at the printed out messages to understand where your code is executing and where it is not executing.