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Re: Is there a limit to t

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  Re: Is there a limit to t Paul.Lee.1971@gmail.com.remove-dii-this - 2011-04-27 15:47 +0000
    Re: Is there a limit to t "Jack Marsh" <jack.marsh@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
      Re: Is there a limit to t "Daniele Futtorovic" <daniele.futtorovic@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
      Re: Is there a limit to t "RedGrittyBrick" <redgrittybrick@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
        Re: Is there a limit to t "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000

#3842 — Re: Is there a limit to t

  To: comp.lang.java.gui
Alright, heres the code. Its still embryonic (threading and tooltips
need to be done). I've highlighted the problem area. I've also missed
out the class that contains the data - its long, boring and doesn't
impact on the rest of the code.


import java.lang.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
import java.math.*;
import java.io.*;
import javax.swing.*;

public class IceDisplayApplet extends JApplet implements Runnable,
ActionListener
{

DataDisplayPanel displayPanel;


// NB: ratio of x:y sizes are 4610:6080

JButton buttonresetcanvas = new JButton("reset map"); // Change the
screen extent

JLabel labelcurrentdate = new JLabel("Current Date:", Label.LEFT);
JLabel labeltimebetweenincrements = new JLabel("Time Increment
(seconds):", Label.LEFT);

JTextField textcurrentdate = new JTextField("",7);
JTextField texttimeincrement = new JTextField("1",7);

JButton buttonstart = new JButton("start");
JButton buttonpause = new JButton("pause");
JButton buttonstop = new JButton("stop");

ButtonManipulator upbutton;
ButtonManipulator downbutton;
ButtonManipulator leftbutton;
ButtonManipulator rightbutton;


double northextent = 49.00;
double southextent = 40.00;
double westextent = 57.00;
double eastextent = 43.00; // the extent of the data
double actualnorthextent, actualsouthextent, actualwestextent,
actualeastextent; // the extent of

the map

public double onemilenorth = 6080.0;
public double onemilewest = 4610.0;


public double N(){return 0.0;}
public double NNE(){return 22.5;}
public double NE(){return 45.0;}
public double ENE(){return 67.5;}
public double E(){return 90.0;}
public double ESE(){return 112.5;}
public double SE(){return 135.0;}
public double SSE(){return 157.5;}
public double S(){return 180.0;}
public double SSW(){return 202.5;}
public double SW(){return 225.0;}
public double WSW(){return 247.5;}
public double W (){return 270.0;}
public double WNW(){return 292.5;}
public double NW(){return 315.0;}
public double NNW(){return 337.5;}

public double nauticalmile = 6080.0;

JPanel display, controls, separator;
Container content;


	GraphicsDataList graphicsList;

Thread animator;

boolean pauseval;
boolean startval;


public double getactualnorthextent()
{
return actualnorthextent;
}

public double getactualsouthextent()
{
return actualsouthextent;
}

public double getactualeastextent()
{
return actualeastextent;
}

public double getactualwestextent()
{
return actualwestextent;
}

public void movemapup()
{
actualnorthextent+=0.16667; // this is decimal
actualsouthextent+=0.16667;
displayPanel.repaint();
}

public void movemapdown()
{
actualnorthextent-=0.16667; // this is decimal!
actualsouthextent-=0.16667;
displayPanel.repaint();


}

public void movemapleft()
{
actualwestextent+=0.16667;
actualeastextent+=0.16667;
displayPanel.repaint();

}

public void movemapright()
{
actualwestextent-=0.16667;
actualeastextent-=0.16667;
displayPanel.repaint();

}

	public GraphicsDataList getgraphicsList()
	{
		return graphicsList;

	}


public void init()
{

resetactuallftorealextent();

		GraphicsDataList graphicsList = new GraphicsDataList();



pauseval = true;
startval = false;

// draw GUI

content=getContentPane();

content.setLayout(new FlowLayout());

display = new JPanel();

//separator = new JPanel();
//separator.setPreferredSize( new Dimension(100, 50));

controls = new JPanel();

initialisegridbaglayout( content );


//display.add( displayPanel );

buttonstart.addActionListener(this);
buttonstop.addActionListener(this);
buttonpause.addActionListener(this);
buttonresetcanvas.addActionListener(this);

upbutton.addActionListener(this);
downbutton.addActionListener(this);
rightbutton.addActionListener(this);
leftbutton.addActionListener(this);

controls.setLayout(new BoxLayout( controls, BoxLayout.Y_AXIS ));

buttonstart.setAlignmentX(Component.CENTER_ALIGNMENT);
buttonstop.setAlignmentX(Component.CENTER_ALIGNMENT);
buttonpause.setAlignmentX(Component.CENTER_ALIGNMENT);
buttonresetcanvas.setAlignmentX(Component.CENTER_ALIGNMENT);


controls.add(buttonstart);
controls.add(Box.createRigidArea(new Dimension(0,5)));


controls.add(buttonstop);
controls.add(Box.createRigidArea(new Dimension(0,5)));


controls.add(buttonpause);
controls.add(Box.createRigidArea(new Dimension(0,5)));


controls.add(buttonresetcanvas);
controls.add(Box.createRigidArea(new Dimension(0,5)));


// Now time increment and current time


JPanel timeindicatorpanel = new JPanel();
timeindicatorpanel.add( labelcurrentdate );
timeindicatorpanel.add( textcurrentdate );

JPanel timeincrementpanel = new JPanel();
timeincrementpanel.add( labeltimebetweenincrements );
timeincrementpanel.add( texttimeincrement );

controls.add( timeindicatorpanel );
controls.add( timeincrementpanel );


content.add( display );
content.add( controls );

setVisible(true);
invalidate();
repaint();

//pack();


}


private void initialisegridbaglayout( Container pane )
{

pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();

JPanel holdingPanel = new JPanel(new GridBagLayout());


upbutton = new ButtonManipulator("up", this);
upbutton.setPreferredSize(new Dimension( 420, 30));
c.gridx = 1;
c.gridy = 0;
holdingPanel.add(upbutton, c);

leftbutton = new ButtonManipulator("left", this);
leftbutton.setPreferredSize(new Dimension( 30, 356));
c.gridx = 0;
c.gridy = 1;
holdingPanel.add(leftbutton, c);

displayPanel = new DataDisplayPanel( this );
displayPanel.setPreferredSize(new Dimension( 420, 356 ));
displayPanel.setBackground( Color.BLACK );
c.gridx = 1;
c.gridy = 1;
holdingPanel.add(displayPanel, c);

rightbutton = new ButtonManipulator("right", this);
rightbutton.setPreferredSize(new Dimension( 30, 356));
c.gridx = 2;
c.gridy = 1;
holdingPanel.add(rightbutton, c);


downbutton = new ButtonManipulator("down", this);
downbutton.setPreferredSize(new Dimension( 420, 30));
c.gridx = 1; //aligned with button 2
c.gridy = 2; //third row
holdingPanel.add(downbutton, c);

pane.add(holdingPanel,new GridBagConstraints());


}



public void stop()
{
animator = null;
startval = false;
}

public void start()
{

if ( !startval )
{
startval = true;
animator = new Thread(this);
animator.start();
}
}


public void run()
{

while (Thread.currentThread() == animator && !pauseval )
{


}

animator = null;
startval = false;
}

public void actionPerformed(ActionEvent e)
{

if (e.getSource() == buttonstart )
{
pauseval = false;

if ( animator == null )
{
start();
}


}

if (e.getSource() == buttonstop )
{

stop();

}

if (e.getSource() == buttonpause )
{
pauseval = true;


}


if (e.getSource() == buttonresetcanvas )
{

resetactuallftorealextent();
displayPanel.repaint();

}


if (e.getSource() == upbutton)
{
movemapup();
}
else if (e.getSource() == leftbutton)
{
movemapleft();
}
else if (e.getSource() == rightbutton)
{
movemapright();
}
else if (e.getSource() == downbutton)
{
movemapdown();
}



}



public double convertstringcoordinatetodouble( String coord )
{
// first split up the String
String temp[] = coord.split("\\.");

double first = Double.parseDouble( temp[0] );
double second = Double.parseDouble( temp[1] );

return (first + (second/60.0));

}



public int[] determinescreencoordinates( double coords[] )
{
// where on the screen does this go?

System.out.println(coords[0] + " " + coords[1]);

double distancefromlefthandside = actualwestextent - coords[0];
double distancefromtop = actualnorthextent - coords[1];

System.out.println(distancefromlefthandside + " " + distancefromtop);


double latextent = actualnorthextent - actualsouthextent;
double longext = actualwestextent - actualeastextent;

int pixelsfromlefthandside = (int) ((distancefromlefthandside*420)/
(actualwestextent -

actualeastextent));

int pixelsfromtop = (int) ((distancefromtop*356)/(actualnorthextent -
actualsouthextent));


int [] screencoords = new int[2];

screencoords[0] = pixelsfromlefthandside;
screencoords[1] = pixelsfromtop;

return screencoords;

}

private void resetactuallftorealextent()
{

actualnorthextent = northextent;
actualsouthextent = southextent;
actualwestextent = westextent;
actualeastextent = eastextent;


}

public void resetscreencoords( int screenxinitial, int screenyinitial,
int eastwestextent, int

northsouthextent)
{

double northsouth = actualnorthextent - actualsouthextent;
double dummy = actualnorthextent;

actualnorthextent = actualnorthextent - (screenyinitial*northsouth)/
356;

actualsouthextent = dummy - ((northsouthextent +
screenyinitial)*northsouth)/356;

double eastwest = actualwestextent - actualeastextent;

actualwestextent = actualwestextent - (screenxinitial*eastwest)/420;

dummy = actualwestextent;

actualeastextent =  dummy - ((eastwestextent +
screenxinitial)*eastwest)/420;

}

}



import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class DataDisplayPanel extends JPanel implements MouseListener,
MouseMotionListener
{
IceDisplayApplet applet;

// TODO: Tooltips.

int initialx, initialy, finalx, finaly;
Boolean areadragged = false;


int screenxinitial, screenyinitial, eastwestextent, northsouthextent;
int eastwestsize, northsouthsize;


public void mouseClicked( MouseEvent e )
{

}

public void mouseEntered( MouseEvent e )
{
}

public void mouseExited( MouseEvent e )
{
}

public void mousePressed( MouseEvent e )
{

// Initial point for dragged/zoomed area

initialx = e.getX();
initialy = e.getY();
areadragged = true;

}

public void mouseReleased( MouseEvent e )
{

if ( areadragged )
{


areadragged = false;

// TODO: resize applet area

applet.resetscreencoords( screenyinitial, screenxinitial,
northsouthextent, eastwestextent );
repaint();
}

}

public void mouseDragged( MouseEvent e )
{
// Final point for zoomed area

finalx = e.getX();
finaly = e.getY();

eastwestsize = finalx - initialx;

northsouthsize = (int) (eastwestsize*356/420);

System.out.println("northsouthsize = " + northsouthsize);
System.out.println("unmodified northsouthsize = " +
(eastwestsize*356/420) );


if ( eastwestsize < 0 ) // swipe in this direction <-----
{
System.out.println("eastwestsize < 0");


if ( finaly > initialy ) // swipe downwards
{

screenxinitial = finalx;
screenyinitial = initialy;
eastwestextent = Math.abs( eastwestsize );
northsouthextent = Math.abs(northsouthsize);
}
else // swipe upwards
{

screenxinitial = finalx;
screenyinitial = finaly;
eastwestextent = Math.abs(eastwestsize);
northsouthextent = Math.abs(northsouthsize);
}


}
else // swipe in this direction ----->
{

if ( finaly > initialy ) // swipe downwards
{

screenxinitial = initialx;
screenyinitial = initialy;
eastwestextent = eastwestsize;
northsouthextent = northsouthsize;

}
else // swipe upwards
{

screenxinitial = initialx;
screenyinitial = finaly;
eastwestextent = eastwestsize;
northsouthextent = northsouthsize;

}
}


// TODO: resize extent in applet.

//applet.resetscreencoords(screenxinitial, screenyinitial,
eastwestextent, northsouthextent );

repaint();


}

public void mouseMoved( MouseEvent e )
{
}


public void paintComponent( Graphics g )
{
super.paintComponent( g );

// Draw points on map, depending on area, "other info", colour etc.

setBackground( Color.BLACK );

double north = applet.getactualnorthextent();
double south = applet.getactualsouthextent();
double west = applet.getactualwestextent();
double east = applet.getactualeastextent();

Boolean eastwestveto = false;
//int counteastwest = 0;

Boolean northsouthveto = false;
//int countnorthsouth = 0;

if ( west - east > 7 ) eastwestveto = true;
if ( north - south > 7 ) northsouthveto = true;


// Draw lines of longitude first

for (int i = (int) Math.ceil((int) east); i <= (int) Math.floor((int)
west); i++)
{

if ( eastwestveto && (i % 2 == 0))
{
double [] coords = {i,0};
int [] screencoords = applet.determinescreencoordinates( coords );


g.setColor ( Color.WHITE );

g.drawLine( screencoords[0], 0, screencoords[0], getHeight() );

g.drawString( new String(i + " W"), screencoords[0]+5,15 );
}

}


for (int j = (int) Math.ceil((int) south); j <= (int) Math.floor((int)
north); j++)
{


if ( northsouthveto && (j % 2 == 0))
{
double [] coords = {0, j};
int [] screencoords = applet.determinescreencoordinates( coords );

g.setColor ( Color.WHITE );

g.drawLine( 0, screencoords[1], getWidth(), screencoords[1] );

g.drawString( new String(j + " N"), 1, screencoords[1]-5 );

}
}

if ( areadragged )
{

g.setColor ( Color.CYAN);

g.drawRect( screenxinitial, screenyinitial, eastwestextent,
northsouthextent );

}

// START OF PROBLEM AREA

GraphicsDataList glist = applet.getgraphicsList();

int listsize = glist.getList().size();

// END OF PROBLEM AREA - REMOVE THE BITS BETWEEN THE DOUBLE SLASHES
AND THE GUI LOOKS OK.

if( listsize != 0  )
{
	if( glist.getcanread())
	{


		// TODO: draw ice, fields, lines etc. on the screen.

		for( int a=0; a< listsize ; a++ )
		{
			DataInfo dinfo = (DataInfo) glist.getList().get(a);

			String dtype = dinfo.getdatatype();

			if ( dtype.equals("FIELD") )
			{
				g.setColor( Color.RED );
			}
			else if ( dtype.equals("BERG") )
			{
				g.setColor( Color.YELLOW );

			}
			else if ( dtype.equals("FIELDBERG") )
			{
				g.setColor( Color.ORANGE );

			}

			String dsubdata = dinfo.getsubdata();

			if ( dsubdata.equals("null") )
			{
				// Draw shape
				// unless coords = 4 points, in which case, draw line

				String [][] coords = dinfo.getcoords();

				if (coords[1][0].equals("") && coords[1][1].equals(""))
				{

				}
				else
				{

				}


			}
			else if ( dsubdata.equals("AREA") )
			{
				// Draw bounding box
			}
			else
			{
				// This is of the format N 8 S 67 - drawline
				// unless it contains NOLINE

			}

		}


	}

// END OF PROBLEM AREA
}

}


public DataDisplayPanel(IceDisplayApplet applet)
{
this.applet = applet;
addMouseListener( this );
addMouseMotionListener(this);
}


}



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonManipulator extends JButton
{

String direction;
IceDisplayApplet hostapplet;


public ButtonManipulator( String direction, IceDisplayApplet
hostapplet )
{
// Arguments = up, down, left, right

this.direction = direction;

// Arguments = main Applet, so that displaypanel can be changed.

this.hostapplet = hostapplet;

}

public void paintComponent(Graphics g)
{

super.paintComponent(g);

setVisible( true );

if ( direction.equals("up") )
{

Polygon poly = new Polygon();
poly.addPoint( getWidth()/2, 3);
poly.addPoint( (getWidth()/2)+25, 26);
poly.addPoint( (getWidth()/2)-25, 26);
g.fillPolygon(poly);

}
else if ( direction.equals("left") )
{

Polygon poly = new Polygon();
poly.addPoint( 3, getHeight()/2 );
poly.addPoint( 26, (getHeight()/2)+25);
poly.addPoint( 26, (getHeight()/2)-25);
g.fillPolygon(poly);

}
else if ( direction.equals("right") )
{

Polygon poly = new Polygon();
poly.addPoint( 27, getHeight()/2);
poly.addPoint( 3, (getHeight()/2)+25);
poly.addPoint( 3, (getHeight()/2)-25);
g.fillPolygon(poly);

}
else if ( direction.equals("down") )
{

Polygon poly = new Polygon();
poly.addPoint( getWidth()/2, 27);
poly.addPoint( (getWidth()/2)+25, 3);
poly.addPoint( (getWidth()/2)-25, 3);
g.fillPolygon(poly);

}
}


}



import java.util.*;

public class GraphicsDataList
{
	private ArrayList GraphicsList;
	Boolean canread;

	public GraphicsDataList()
	{

		GraphicsList = new ArrayList();
		canread = false;
	}

	public ArrayList getList()
	{
		return GraphicsList;
	}

	public void setcanread( Boolean value )
	{
		canread = value;
	}

	public Boolean getcanread()
	{
		return canread;
	}

}



public class DataInfo
{
	String date;
	String shipname;
	String coords[][];
	String subdata;
	String datatype;
	String info;

	DataInfo( String datevals, String shipnameval, String coordvals,
String subdatavals,  String datatypevals, String infovals )
	{

		//System.out.println("Inside DataInfo constructor: coordvals = " +
coordvals);

		coords = new String[2][2];

		//System.out.println("Inside DataInfo constructor: created new
coords member");

		coords[1][0]="";
		coords[1][1]="";

		//System.out.println("Inside DataInfo constructor: assigned dummy
data to coords");


		String temp[] = coordvals.split(" ");

		//System.out.println("Inside DataInfo constructor: Just split
coordvals: " + temp.length);
		//System.out.println("temp coords " + coordvals);

		coords[0][0] = temp[0];
		coords[0][1] = temp[2];

		//System.out.println("Inside DataInfo constructor: Just assigned
first variables");

		if (temp.length == 8)
		{

			coords[1][0] = temp[4];
			coords[1][1] = temp[6];

		}

		date = datevals;
		subdata = subdatavals;
		shipname = shipnameval;
		datatype = datatypevals;
		info = infovals;

		//System.out.println("Finished with DataInfo constructor");

	}

	public String getdate()
	{
		return date;
	}

	public String getshipname()
	{
		return shipname;
	}

	public String[][] getcoords()
	{
		return coords;
	}

	public String getsubdata()
	{
		return subdata;
	}

	public String getdatatype()
	{
		return datatype;
	}

	public String getinfo()
	{
		return info;
	}

}

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#3849

  To: comp.lang.java.gui
Style issues aside, I found your problem:

> 
> public void init()
>{
>
>resetactuallftorealextent();
>
>	GraphicsDataList graphicsList = new GraphicsDataList();
> 
> 

should be
public void init()
{

    resetactuallftorealextent();
    graphicsList = new GraphicsDataList();
   ...

You have declared a new local variable with the same name as your class 
instance variable.  When the init() method terminates so does this local 
version.  The problem you experienced but failed to describe was an 
endless series of NullPointerException stack traces being thrown and 
discarded behind the scenes.

And please refactor the code to use camelCase names.  Just scanning 
through it gave me and anyone who looked at it headaches.

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#3852

  To: comp.lang.java.gui
On 30/07/2008 01:55, Jack Marsh allegedly wrote:
> You have declared a new local variable with the same name as your class 
> instance variable.  When the init() method terminates so does this local 
> version.  The problem you experienced but failed to describe was an 
> endless series of NullPointerException stack traces being thrown and 
> discarded behind the scenes.

Well spotted!

Ah, I understand; since he ran it as an Applet, he didn't get the stack 
trace.

> And please refactor the code to use camelCase names.  Just scanning 
> through it gave me and anyone who looked at it headaches.

-- 
DF.

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#3856

  To: comp.lang.java.gui
Jack Marsh wrote:
> And please refactor the code to use camelCase names.  Just scanning 
> through it gave me and anyone who looked at it headaches.

Amen.

-- 
RGB

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#3857

  To: comp.lang.java.gui
RedGrittyBrick wrote:
> Jack Marsh wrote:
>> And please refactor the code to use camelCase names.  Just scanning 
>> through it gave me and anyone who looked at it headaches.
> 
> Amen.

A two-space indent would be nice, too.

-- 
Lew

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