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Thread: mouseClicked and color objects in arrays

  1. #1
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    Smile mouseClicked and color objects in arrays

    Hey guys!

    I have coded an applet that will show something like this (mines a different color):



    The code below does WORK. The mouseListener part doesn't.

     
    public class ColoredSquares extends JApplet implements MouseListener
    {
     
    	Random rand = new Random();
    	private MouseEvent evt = null;
    	private boolean isClicked;
     
    	// declare instance variables
    	// initialize instance variable with an array of Color objects
    	Color [][] a;
    	Color randC;
    	int x, y;
    	int myClickX;
    	int myClickY;
     
     
        // generates a color
        public Color Color(Color randC) 
        {
       	// huge method, omitted to make code shorter
    	}
     
        public void init ()
        {
        	// sets window size of the applet viewer
        	 setSize(800,800);
     
            // fill entire applet with background color
            setBackground(Color.BLACK);
     
    		// fill array with 8x8 color objects 
    		a = new Color[8][8]; 
     
    		for (int x = 0; x < a.length; x++)
    			for (int y = 0; y < a.length; y++)
    				a[x][y] = Color(randC);
     
            // implement MouseListener interface
    		this.addMouseListener(this);        <--- I think this line is WRONG
        } // end init method
     
     
        public void paint(Graphics g)
        {	   	
     
        	// rectangle size is determined by applet size
        	// leave space at the bottom to draw a string
        	int rowHeight = (getHeight() / 8) - 5;
        	int colWidth = (getWidth() / 8);
     
            // loop through each array object and paint a rectangle
            for (int row = 0; row < a.length; row++)
    	     {
    		    for (int col = 0; col < a.length; col++)
    		    {
     
    		    	g.setColor(a[row][col]);
    		        g.fillRect(col*colWidth, row*rowHeight, colWidth, rowHeight );	
     
     
    		    }
    	     }
     
     
    	   	// if mouseClicked is true, then change the color of the square that was clicked on 
    	   	if (evt != null && isClicked == true)
    	   	{
     
    	    	// if a square is clicked on
    	        // the square turns red
    	   		 g.setColor(Color.red);
    	         int col = 0;
    			 int row = 0;
    			 g.fillRect(col*colWidth, row*rowHeight, colWidth, rowHeight );
    	   	}
     
        } // end paint method
     
     
     
    	public void mouseClicked(MouseEvent evt)
    	{
    		// save the evt pointer in my global variable
    		 this.evt = evt;
     
    		// stores the current click of the mouse, X and Y position
    		 myClickX = evt.getX();
    		 myClickY = evt.getY();
     
     
                     NOT sure what to do HERE V V below V V
     
     
    		 // if an array element is clicked
    		 //		return isClicked = true
    		 // else 
    		 //		return isClicked = false
     
     
     
    		repaint();
    	} // end mouseClicked method
     
    	public void mouseExited(MouseEvent evt)	{}
    	public void mouseEntered(MouseEvent evt) {}
    	public void mouseReleased(MouseEvent evt) {}
    	public void mousePressed(MouseEvent evt) {}
     
     
    } // end class

    What I want to happen is when I click on one of the squares in the applet, I want to change the color of the array element corresponding to that square to RED.

    I don't believe any other method is to be added-- use the methods already stated. No JPanel recommendations please. I'm not supposed to use that.

    I know that in my mouseListener I want to find WHICH index of the array was clicked. Then return that the click is true. In my paint, I want "if click is true, then set color to red, and paint that index". Or something like that...

    Please at least give me an example of a mouseListener with a multidimensional array. >_<
    Any help would be much appreciated.


  2. #2
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    Default Re: mouseClicked and color objects in arrays

    Hey guys!

    I have coded an applet that will show something like this (mines a different color):



    The code below does WORK. The mouseListener part doesn't.

     
    public class ColoredSquares extends JApplet implements MouseListener
    {
     
    	Random rand = new Random();
    	private MouseEvent evt = null;
    	private boolean isClicked;
     
    	// declare instance variables
    	// initialize instance variable with an array of Color objects
    	Color [][] a;
    	Color randC;
    	int x, y;
    	int myClickX;
    	int myClickY;
     
     
        // generates a color
        public Color Color(Color randC) 
        {
       	// huge method, omitted to make code shorter
    	}
     
        public void init ()
        {
        	// sets window size of the applet viewer
        	 setSize(800,800);
     
            // fill entire applet with background color
            setBackground(Color.BLACK);
     
    		// fill array with 8x8 color objects 
    		a = new Color[8][8]; 
     
    		for (int x = 0; x < a.length; x++)
    			for (int y = 0; y < a.length; y++)
    				a[x][y] = Color(randC);
     
            // implement MouseListener interface
    		this.addMouseListener(this);        <--- I think this line is WRONG
        } // end init method
     
     
        public void paint(Graphics g)
        {	   	
     
        	// rectangle size is determined by applet size
        	// leave space at the bottom to draw a string
        	int rowHeight = (getHeight() / 8) - 5;
        	int colWidth = (getWidth() / 8);
     
            // loop through each array object and paint a rectangle
            for (int row = 0; row < a.length; row++)
    	     {
    		    for (int col = 0; col < a.length; col++)
    		    {
     
    		    	g.setColor(a[row][col]);
    		        g.fillRect(col*colWidth, row*rowHeight, colWidth, rowHeight );	
     
     
    		    }
    	     }
     
     
    	   	// if mouseClicked is true, then change the color of the square that was clicked on 
    	   	if (evt != null && isClicked == true)
    	   	{
     
    	    	// if a square is clicked on
    	        // the square turns red
    	   		 g.setColor(Color.red);
    	         int col = 0;
    			 int row = 0;
    			 g.fillRect(col*colWidth, row*rowHeight, colWidth, rowHeight );
    	   	}
     
        } // end paint method
     
     
     
    	public void mouseClicked(MouseEvent evt)
    	{
    		// save the evt pointer in my global variable
    		 this.evt = evt;
     
    		// stores the current click of the mouse, X and Y position
    		 myClickX = evt.getX();
    		 myClickY = evt.getY();
     
     
                     NOT sure what to do HERE V V below V V
     
     
    		 // if an array element is clicked
    		 //		return isClicked = true
    		 // else 
    		 //		return isClicked = false
     
     
     
    		repaint();
    	} // end mouseClicked method
     
    	public void mouseExited(MouseEvent evt)	{}
    	public void mouseEntered(MouseEvent evt) {}
    	public void mouseReleased(MouseEvent evt) {}
    	public void mousePressed(MouseEvent evt) {}
     
     
    } // end class

    What I want to happen is when I click on one of the squares in the applet, I want to change the color of the array element corresponding to that square to RED.

    I don't believe any other method is to be added-- use the methods already stated. No JPanel recommendations please. I'm not supposed to use that.

    I know that in my mouseListener I want to find WHICH index of the array was clicked. Then return that the click is true. In my paint, I want "if click is true, then set color to red, and paint that index". Or something like that...

    Please at least give me an example of a mouseListener with a multidimensional array. >_<
    Any help would be much appreciated.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: mouseClicked and color objects in arrays

    Try debugging the code by adding some println statements that print out a message when a listener is called.
    Also print out the values passed to the listener in the event object.
    If you don't understand my answer, don't ignore it, ask a question.

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