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Thread: JLabel meant to move around is not moving

  1. #1
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    Post JLabel meant to move around is not moving

    Hello!

    I am making a program where JLabels containing numbers are to move to their correct position in a binary heap, but I cannot get the label to move. I have the x-coordinates and y-coordinates correct, and you can see the shadow of the JLabel moving, but in the end it stays where it used to be. Can somebody help?
    The moving method is the moveTo method. (Node extends JLabel, and has no significant changes)

    This is my code:

    import java.awt.Color;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.util.ArrayList;
    import java.util.Scanner;
     
    import javax.swing.JFrame;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
     
    public class HeapDraw extends JFrame
    {
    	private static final long serialVersionUID = (240)-678-7912;
    	private static ArrayList<Integer> heap = new ArrayList<Integer>();
    	private static ArrayList<Node> heapNode = new ArrayList<Node>();
    	private static int numRows;
    	private static ArrayList<Double> xCoords;
    	private static ArrayList<Double> yCoords;
    	private static JFrame drawing;
    	private static JPanel panel;
     
    	public static void main(String [] args)
    	{
    		doNothing();
    	}
     
    	public static void doNothing()
    	{
    		readHeap();
    		drawing = new JFrame("Heap Tree");
    		for(int i = 0; i < heap.size(); i++)
    			heapNode.add(new Node(heap.get(i)));
    		panel = new JPanel();
    		drawing.setSize(800, 600);
    		panel.setBackground(Color.WHITE);
    		drawing.setVisible(true);
    		drawing.add(panel);
    		try
    		{
    			Thread.sleep(200);
    		}
    		catch (InterruptedException e1)
    		{
    			// TODO Auto-generated catch block
    			e1.printStackTrace();
    		}
    		for(int i = 0; i < heap.size(); i++)
    		{
    			panel.add(heapNode.get(i));
    			try
    			{
    				Thread.sleep(200);
    				panel.updateUI();
    				drawing.repaint();
    			}
    			catch (InterruptedException e)
    			{
    				JOptionPane.showMessageDialog(null, "Error: Interrupted", "Error", JOptionPane.ERROR_MESSAGE);
    			}
    		}
    		drawing.repaint();
    		numRows = getRows(heap);
    		xCoords = xCoords(heap, numRows, panel.getWidth());
    		yCoords = yCoords(heap, numRows, panel.getHeight());
    		System.out.println(heapNode.get(0));
    		System.out.println(xCoords.get(0));
    		System.out.println(yCoords.get(0));
    		moveTo(heapNode.get(0), (int)((double)xCoords.get(0)), (int)((double)yCoords.get(0)));
    	}
     
    	public static void readHeap()
    	{
    		try{
    			Scanner reader = new Scanner(new FileReader("numbers.txt"));
    			while(reader.hasNextInt())
    				heap.add(reader.nextInt());
    		}//end try clause for reading numbers and inserting them into a heap, and building it
    		catch(FileNotFoundException e)
    		{
    			JOptionPane.showMessageDialog(null, "404 Error: \nFile not Found", "404 Internal Error", JOptionPane.ERROR_MESSAGE);
    			System.exit(0);
    		}//end catch clause for when input file is not found
    	}//end method readHeap
     
    	public static void moveTo(Node t, int xCoord, int yCoord)
    	{
    		int x = t.getX(), y=t.getY();
    		double xInt = xCoord>x?xCoord-x:x-xCoord; double yInt = yCoord>y?yCoord-y:y-yCoord;
    		xInt = xInt/100; yInt = yInt/100;
    		double newX = t.getX()+xInt, newY = t.getY()+yInt;
    		System.out.println(xInt);
    		System.out.println(yInt);
    		for(int i = 0; i<100; i++)
    		{
    			try
    			{
    				Thread.sleep(10);
    				t.setLocation((int)newX, (int)newY);
    				panel.updateUI();
    				drawing.repaint();
    				//System.out.println("X: " + t.getX() + "\nY: " + t.getY());
    			}
    			catch (InterruptedException e)
    			{
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			newX = newX+xInt; newY = newY+yInt;
    		}
    		System.out.println("here");
    		System.exit(0);
    	}
     
    	public static int getRows(ArrayList<Integer> a)
    	{
    		ArrayList<Integer> ref = new ArrayList<Integer>();
    		for(int i = 0; i < a.size(); i++)
    			ref.add((int)((.5*i)*(i+1)));
    		int i = 0;
    		while(ref.get(i) < a.size())
    			i++;
    		return i-1;
    	}
     
    	public static ArrayList<Double> xCoords(ArrayList<Integer> a, int numRows, int width)
    	{
    		ArrayList<Double> xCoords = new ArrayList<Double>();
    		double i = 2.0;
    		int power = 1;
    		while(i<=2*a.size())
    		{
    			double j = 1.0;
    			while(j <= i-1)
    			{
    				xCoords.add((j*width)/i);
    				j++;
    			}
    			i = Math.pow(2, power)+1;
    			power++;
    		}
    		return xCoords;
    	}
     
    	public static ArrayList<Double> yCoords(ArrayList<Integer> a, int numRows, int height)
    	{
    		ArrayList<Double> yCoords = new ArrayList<Double>();
    		double interval = height / numRows;
    		double i = 1;
    		int power = 0;
    		int multiplier = 0;
    		while(i<=2*a.size())
    		{
    			double j = 0;
    			while(j<i)
    			{
    				yCoords.add(interval*multiplier);
    				j++;
    			}
    			power++;
    			i = Math.pow(2, power);
    			multiplier++;
    		}
    		for(int k = 0; k < yCoords.size(); k++)
    			yCoords.set(k, yCoords.get(k) + 20);
    		return yCoords;
     
    	}
     
     
    }


  2. #2
    Super Moderator Sean4u's Avatar
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    Default Re: JLabel meant to move around is not moving

    You need an SSCCE ( sscce.org ) - that's just too much code *and* with a missing component, you'll be lucky to find anyone willing to attempt to debug it for you. A JLabel that moves depending on some values from somewhere else doesn't sound particularly difficult - I suspect you'll work out for yourself where you're going wrong (or a better way to do it) while you're constructing the SSCCE.

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