org.PingOO.DLAI.lib.graph
Class IsoCurve

java.lang.Object
  |
  +--org.PingOO.DLAI.lib.graph.IsoCurve

public class IsoCurve

extends java.lang.Object

This class will calculate the constant curve of a given value passing through a grid of values.

Version:

$Revision: 1.6 $, $Date: 1996/07/30 04:52:40 $.

Author:

Leigh Brookshaw

Field Summary

(package private) static int	ARRAYSIZE Initial size of the array that will hold a contour.
(package private) static int	BOTTOM Flag a cell as having the curve coming through its Bottom face
protected java.util.Vector	cells Vector of cells that the contour passes through.
protected double[]	curve Array that holds the points of the contour
protected double[]	grid Array holding the data grid.
(package private) static int	LEFT Flag a cell as having the curve coming through its Left face
(package private) static int	MAXARRAYSIZE Maximum size of the array that will hold a contour.
protected int	nx X Dimension of data grid
protected int	ny Y Dimension of data grid
(package private) static int	RIGHT Flag a cell as having the curve coming through its Right face
protected int	size Number of points in the contour
(package private) static int	TERMINAL Flag a cell face as a terminal face ie the curve terminates here.
(package private) static int	TOP Flag a cell as having the curve coming through its Top face
protected double	value Contour value to be found

Constructor Summary

IsoCurve()
Instantiate the class and initialize all the variables

IsoCurve(double[] grid, int nx, int ny)
Instantiate the class and initialize all the variables.

Method Summary

protected void	addDataPoint(double x, double y) Add a data point to the contour curve.
protected void	addDataPoint(int wall, int icell, int jcell) Add a data point to the contour curve.
protected void	createCells() Create the vector of all cells that contain the contour.
protected void	getcurve() Traverse the cells and find One connect countour.
double[]	getCurve() Return a contour curve.
protected double[]	getPoint(int wall, int icell, int jcell) Return the (x,y) position where the contour cross the cell wall.
protected Cell	search(int icell, int jcell) Search for a cell in the contour cell list
void	setGrid(double[] grid, int nx, int ny) Set the grid to be contoured
void	setValue(double value) Set the value to contour

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

TERMINAL

static final int TERMINAL

Flag a cell face as a terminal face ie the curve terminates here.

LEFT

static final int LEFT

Flag a cell as having the curve coming through its Left face

RIGHT

static final int RIGHT

Flag a cell as having the curve coming through its Right face

TOP

static final int TOP

Flag a cell as having the curve coming through its Top face

BOTTOM

static final int BOTTOM

Flag a cell as having the curve coming through its Bottom face

ARRAYSIZE

static final int ARRAYSIZE

Initial size of the array that will hold a contour.

MAXARRAYSIZE

static final int MAXARRAYSIZE

Maximum size of the array that will hold a contour.

cells

protected java.util.Vector cells

Vector of cells that the contour passes through.

grid

protected double[] grid

Array holding the data grid.

nx

protected int nx

X Dimension of data grid

ny

protected int ny

Y Dimension of data grid

curve

protected double[] curve

Array that holds the points of the contour

size

protected int size

Number of points in the contour

value

protected double value

Contour value to be found

Constructor Detail

IsoCurve

public IsoCurve()

Instantiate the class and initialize all the variables

IsoCurve

public IsoCurve(double[] grid,
                int nx,
                int ny)

Instantiate the class and initialize all the variables.

Parameters:

grid - An nx by ny Array containing the grid to contour

nx - X dimension of the grid.

ny - Y dimension of the grid.

Method Detail

setGrid

public void setGrid(double[] grid,
                    int nx,
                    int ny)

Set the grid to be contoured

Parameters:

nx - X dimension of the grid.

ny - Y dimension of the grid.

setValue

public void setValue(double value)

Set the value to contour

Parameters:

value - the contour level

getCurve

public double[] getCurve()

Return a contour curve. If null is returned it means that all the contour curves have been found.

Returns:

The array containing the (x,y) pairs of the contour curve.

createCells

protected void createCells()

Create the vector of all cells that contain the contour.

getcurve

protected void getcurve()

Traverse the cells and find One connect countour.

getPoint

protected double[] getPoint(int wall,
                            int icell,
                            int jcell)

Return the (x,y) position where the contour cross the cell wall.

Parameters:

wall - The cell wall the contour crosses.

icell - The x index of the cell position.

jcell - The y index of the cell position.

addDataPoint

protected void addDataPoint(int wall,
                            int icell,
                            int jcell)

Add a data point to the contour curve.

Parameters:

wall - The cell wall the contour crosses.

icell - The x index of the cell position.

jcell - The y index of the cell position.

addDataPoint

protected void addDataPoint(double x,
                            double y)

Add a data point to the contour curve.

Parameters:

x - The x position of the point.

y - The y position of the point.

search

protected Cell search(int icell,
                      int jcell)

Search for a cell in the contour cell list

Parameters:

icell - the x index of the cell

jcell - the y index of the cell