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Class ChaosDemos.boxCalculate

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----ChaosDemos.boxCalculate

public class boxCalculate
extends Panel
implements Runnable

Calculates dimesion of 2D maps by box counting algorithm, uisng a fast sort algorithm to arrange array of finest boxes and then successively coarsening and weeding the array.
Stores number of boxes to cover points in divIndex[nDiv+1]

Version:: 2 August 1997
Author:: Michael Cross

boxCount

Array contining number of points in boxes:

0 to divIndex[0]-1 for finest subdivision
divIndex[0] to divIndex[1]-1 for next etc.
completed
True if calculation of box coverage is complete
divIndex
Array of size nDiv+1 containing number of boxes covering attractor at each division scale
output
Array contining box locations:
- 0 to divIndex[0]-1 for finest subdivision
- divIndex[0] to divIndex[1]-1 for next etc.
  total
  Total nuber of points

boxCalculate(): Default constructor lays out button and textBox controls

getNDiv(): returns value of number of subdivisions
getQ(): returns value of dimension order
handleEvent(Event): Handles button event to stop calculation
parseTextField(TextField, int): Parses text field known to be integer.
parseTextField(TextField, int, boolean): Parses text field known to be integer of known sign.
run(): Thread to perform calculation
setNDiv(int): sets value of number of subdivisions
setQ(int): sets value of dimension order
setText(String): Sets textBox contents
setup(int[]): Sets up calculation.
stopRequest(): stops calculation
textBoxDisable(): disables TextFields
textBoxEnable(): enables TextFields

divIndex

 public int divIndex[]

Array of size nDiv+1 containing number of boxes covering attractor at each division scale

total

 public int total

Total nuber of points

output

 public int output[]

Array contining box locations:

0 to divIndex[0]-1 for finest subdivision
divIndex[0] to divIndex[1]-1 for next etc.

Position (i,j) is stored as i+j*N where there are N boxes across one direction of map at this scale, and i and j run from 0 to N-1.

boxCount

 public int boxCount[]

Array contining number of points in boxes:

0 to divIndex[0]-1 for finest subdivision
divIndex[0] to divIndex[1]-1 for next etc.

stored as in output.

completed

 public boolean completed

True if calculation of box coverage is complete

boxCalculate

 public boxCalculate()

Default constructor lays out button and textBox controls

setup

 public void setup(int in_x[])

Sets up calculation. Must be called before calculation thread is started.

Parameters:: in_x - Array of data in x,y pairs of ints given by box number on finest (2^nDiv) scale; in_nDiv - Number of subdivisions to make (from 0 to nDiv)

run

 public void run()

Thread to perform calculation

stopRequest

 public void stopRequest()

stops calculation

handleEvent

 public boolean handleEvent(Event evt)

Handles button event to stop calculation

Overrides:: handleEvent in class Component

setText

 public void setText(String text)

Sets textBox contents

Parameters:: text - contents

parseTextField

 public int parseTextField(TextField t,
                           int i,
                           boolean positive)

Parses text field known to be integer of known sign. Resets old value of corresponding variable if input format is incorrect or wrong sign and brings up alertDialog warning box.

Parameters:: t - field to be parsed; i - old value of variable; positive - true if value should be positive, false if should be negative
Returns:: new value of parameter if textbox format is correct, and value of correct sign, otherwise old value.
See Also:: alertDialog

parseTextField

 public int parseTextField(TextField t,
                           int i)

Parses text field known to be integer. Resets old value of corresponding variable if input format is incorrect and brings up alertDialog warning box.

Parameters:: t - field to be parsed; i - old value of variable
Returns:: new value of parameter if textbox format is correct, otherwise old value.
See Also:: alertDialog

getQ

 public int getQ()

returns value of dimension order

Returns:: dimension order q

setQ

 public void setQ(int in_q)

sets value of dimension order

Parameters:: in_q - dimension order q

getNDiv

 public int getNDiv()

returns value of number of subdivisions

Returns:: number of subdivisions

setNDiv

 public void setNDiv(int in_nDiv)

sets value of number of subdivisions

Parameters:: in_nDiv - number of subdivisions

textBoxEnable

 public void textBoxEnable()

enables TextFields

textBoxDisable

 public void textBoxDisable()

disables TextFields

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