All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class convexHull.ConvexHull 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----convexHull.ConvexHull
public class ConvexHull
extends Applet
implements ActionListener, ItemListener
This class implements a user interface (both for main() and Applet) to test the code for convex hull algorithm.

Variable Index

o canvas
o clearButton
o hull
o hullCheckbox
o maxx
o maxy
o MIND
o minx
o miny
o points
o quitButton
o running_as_applet
o stairs
o stairsCheckbox

Constructor Index

o ConvexHull()
initializes empty data-structures

Method Index

o actionPerformed(ActionEvent)
Handles button events.
o addPoint(CPoint)
adds a new point to points[]
o getAppletInfo()
Gets the applet information.
o getNum(StreamTokenizer)
Gets a floating point number from the stream.
o init()
Initializes the user interface for the applet
o itemStateChanged(ItemEvent)
Handles checkbox events.
o main(String[])
main entrypoint - starts the part when it is run as an application
o readData(String)
Read points from a data file.
o runMain(String[])

Variables

o points 
 protected Vector points
o hull 
 protected Vector hull
o stairs 
 protected Vector stairs
o canvas 
 protected Canvas canvas
o quitButton 
 protected Button quitButton
o clearButton 
 protected Button clearButton
o hullCheckbox 
 protected Checkbox hullCheckbox
o stairsCheckbox 
 protected Checkbox stairsCheckbox
o minx 
 protected float minx
o miny 
 protected float miny
o maxx 
 protected float maxx
o maxy 
 protected float maxy
o MIND 
 private static final float MIND
o running_as_applet 
 private static boolean running_as_applet

Constructors

o ConvexHull 
 public ConvexHull()
initializes empty data-structures

Methods

o actionPerformed 
 public void actionPerformed(ActionEvent e)
Handles button events. quit button --> exit the program clear button --> erase the points and the convex hull, then redraw the screen

o itemStateChanged 
 public void itemStateChanged(ItemEvent e)
Handles checkbox events.

o addPoint 
 protected void addPoint(CPoint p)
adds a new point to points[]

o getAppletInfo 
 public String getAppletInfo()
Gets the applet information.

Returns:
java.lang.String
Overrides:
getAppletInfo in class Applet
o getNum 
 private float getNum(StreamTokenizer st) throws EOFException, IOException
Gets a floating point number from the stream.

Parameters:
st - StreamTokenizer
Returns:
floating point number (next on the input)
o readData 
 public boolean readData(String fname)
Read points from a data file.

Parameters:
fname - name of the file to read the data from
Returns:
boolean true = error occurd, false = no errors
o init 
 public void init()
Initializes the user interface for the applet

Overrides:
init in class Applet
o main 
 public static void main(String args[])
main entrypoint - starts the part when it is run as an application

Parameters:
args - java.lang.String[]
o runMain 
 public void runMain(String args[])

All Packages  Class Hierarchy  This Package  Previous  Next  Index