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Thread: HELP with Java Paint Program Code

  1. #1
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    Default HELP with Java Paint Program Code

    I need some help with figuring out how to let a user choose between colors and the size of the line by clicking on the button with the corresponding color name and a JSpinner to increase the size. Basically I need help with the listeners and methods on my color buttons and JSpinner. Here is the code I have so far.

    import java.awt.*;
    import java.awt.event.*;
     
    import javax.swing.*;
     
    public class myJPanelstd extends JPanel implements MouseMotionListener, ActionListener
    {
    	// Attributes
        JButton bx,by, bmessage,bc1,bc2,bc3,be1;
        JPanel p1;
        int width=5;
        int height=5;
     
        Point[]ps= new Point [10000];
        Color[]cs= new Color[10000];
        int[] size = new int[10000];
        int count=0;
        JSpinner spin1;
     
            // Constructor
    	public myJPanelstd()
    	{
    		setBackground(Color.white);
    		setLayout(new BorderLayout());
     
    		p1 = new JPanel();
    		p1.setLayout(new GridLayout(2,4));
    		//Create Buttons
    		bc1= new JButton("RED");
    		bc2= new JButton("BLUE");
    		bc3= new JButton("GREEN");
    		be1= new JButton("ERASE");
    		bx = new JButton("x = ");
    		by = new JButton("y = ");
    		spin1=new JSpinner();
     
    		bmessage = new JButton("Move the mouse");
     
    		// Add buttons to Panel p1
    		p1.add(bc1);
    		bc1.addActionListener(this);
    		bc1.setBackground(Color.red);
    		p1.add(bc2);
    		bc2.setBackground(Color.blue);
    		p1.add(bc3);
    		bc3.setBackground(Color.green);
    		p1.add(be1);
     
    		p1.add(spin1);
     
    		add(p1,"South");
     
    		// Add Mouse Listener to Panel
            addMouseMotionListener(this);
     
    	} // end constructor
     
    	//----------------------------------------------------------------------------
    	// All 2 methods must be created, even if you are not going to use one of them
    	//----------------------------------------------------------------------------
        public void mouseMoved(MouseEvent evt)
        {
        	Point pt = evt.getPoint();		// get the mouse position
     
        	String sx = "x = " + pt.getX();	// get X position of the mouse
            bx.setText(sx);
     
        	String sy = "y = " + pt.getY();	// get X position of the mouse
            by.setText(sy);
     
            bmessage.setText("Mouse moved");
        }
     
        //-------------------------------------------------------------------
        public void mouseDragged(MouseEvent evt)
        {
        	Point pt=evt.getPoint();
        	int mx=(int) pt.getX();
        	int my =(int) pt.getY();
        	Graphics g=getGraphics();
        	g.setColor(Color.cyan);
        	g.fillOval(mx,my,width ,height);
        	ps[count]=pt;
        	cs[count]=Color.cyan;
        	size[count]=
        	count++;
        	bmessage.setText("Mouse dragged");
        }
        public void paintComponent(Graphics g)
        {
        	super.paintComponent(g);
        	for(int j=0;j< count; j++)
        	{
     
        		g.setColor(cs[j]);
        		g.fillOval((int)ps[j].getX(),(int)ps[j].getY(),5,5);
        	}
        }
     
    } // end class


  2. #2
    Member Darryl.Burke's Avatar
    Join Date
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    Madgaon, Goa, India
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    Default Re: HELP with Java Paint Program Code

    Never, never use getGraphics() of a Component. Learn to do custom painting the correct way:
    Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)

    db

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