Package org.opensourcephysics.display2d

Class VectorPlot

java.lang.Object

org.opensourcephysics.display2d.VectorPlot

All Implemented Interfaces:

Drawable, Measurable, Plot2D

public class VectorPlot
extends Object
implements Plot2D

VectorPlot renders a vector field in a drawing panel using arrows centered on each grid point in the GridPointData. The default representation of the vector field uses fixed length arrows to show direction and color to show magnitude.

Version:

1.0

Author:

Wolfgang Christian

Field Summary

Fields

Modifier and Type	Field	Description
static final int	FILLEDARROW
static final int	STROKEDARROW

Fields inherited from interface org.opensourcephysics.display2d.Plot2D

CONTOUR_PLOT, GRID_PLOT, INTERPOLATED_PLOT, SURFACE_PLOT

Constructor Summary

Constructors

Constructor	Description
VectorPlot()	Constructs a VectorPlot without data.
VectorPlot(GridData _griddata)	Constructs a VectorPlot that renders the given grid data.

Method Summary

Modifier and Type	Method	Description
void	draw(DrawingPanel panel, Graphics g)	Draws this vector field in the given drawing panel.
double	getCeiling()	Gets the ceiling for scaling the z data.
double	getFloor()	Gets the floor for scaling the z data.
GridData	getGridData()	Gets the GridData object.
static XML.ObjectLoader	getLoader()	Gets an XML.ObjectLoader to save and load data for this program.
double	getXMax()	Gets the maximum x needed to draw this object.
double	getXMin()	Gets the minimum x needed to draw this object.
double	getYMax()	Gets the maximum y needed to draw this object.
double	getYMin()	Gets the minimum y needed to draw this object.
double	indexToX(int i)	Gets the x coordinate for the given index.
double	indexToY(int i)	Gets the y coordinate for the given index.
boolean	isAutoscaleZ()	Gets the autoscale flag for z.
boolean	isMeasured()	Determines if information is available to set min/max values.
boolean	isSymmetricZ()	Gets the symmetric z flag.
void	scaleArrowLenghToGrid(boolean scaleToGrid)	Sets the autoscale flag for the arrow length.
void	setAll(Object obj)	Sets the data to new values.
void	setAll(Object obj, double xmin, double xmax, double ymin, double ymax)	Sets the values and the scale.
void	setArrowType(int type)	Sets this vector field to draw vectors with filled shafts and arrowheads.
void	setAutoscaleZ(boolean isAutoscale, double floor, double ceil)	Sets the autoscale flag and the floor and ceiling values.
void	setColorPalette(Color[] colors)	Sets the colors that will be used between the floor and ceiling values.
void	setExpandedZ(boolean expanded, double expansionFactor)	Expands the z scale so as to enhance values close to zero.
void	setFloorCeilColor(Color floorColor, Color ceilColor)	Sets the floor and ceiling colors.
void	setGridData(GridData _griddata)	Sets the data storage to the given value.
void	setGridLineColor(Color c)	Sets the color for grid line boundaries
void	setIndexes(int[] indexes)	Sets the indexes for the data components that will be plotted.
void	setPaletteType(int mode)	Sets the type of palette.
void	setShowGridLines(boolean showGrid)	Outlines the data grid's boundaries.
void	setSymmetricZ(boolean symmetric)	Forces the z-scale to be symmetric about zero.
void	setVisible(boolean vis)	Sets this vector field to be visible.
JFrame	showLegend()	Shows how values map to colors.
void	update()	Updates the vector field using the data array.
int	xToIndex(double x)	Gets closest index from the given x world coordinate.
int	yToIndex(double y)	Gets closest index from the given y world coordinate.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opensourcephysics.display.Drawable

isInteractive

Field Details

STROKEDARROW

public static final int STROKEDARROW

See Also:

• Constant Field Values

FILLEDARROW

public static final int FILLEDARROW

See Also:

• Constant Field Values

Constructor Details

VectorPlot

public VectorPlot()

Constructs a VectorPlot without data.

VectorPlot

public VectorPlot(GridData _griddata)

Constructs a VectorPlot that renders the given grid data.

Parameters:

_griddata - the data

Method Details

xToIndex

public int xToIndex(double x)

Gets closest index from the given x world coordinate.

Specified by:

xToIndex in interface Plot2D

Parameters:

x - double the coordinate

Returns:

int the index

yToIndex

public int yToIndex(double y)

Gets closest index from the given y world coordinate.

Specified by:

yToIndex in interface Plot2D

Parameters:

y - double the coordinate

Returns:

int the index

indexToX

public double indexToX(int i)

Gets the x coordinate for the given index.

Specified by:

indexToX in interface Plot2D

Parameters:

i - int

Returns:

double the x coordinate

indexToY

public double indexToY(int i)

Gets the y coordinate for the given index.

Specified by:

indexToY in interface Plot2D

Parameters:

i - int

Returns:

double the y coordinate

setAll

public void setAll(Object obj)

Sets the data to new values. The grid is resized to fit the new data if needed.

Specified by:

setAll in interface Plot2D

Parameters:

obj -

setAll

public void setAll(Object obj,
 double xmin,
 double xmax,
 double ymin,
 double ymax)

Sets the values and the scale. The grid is resized to fit the new data if needed.

Specified by:

setAll in interface Plot2D

Parameters:

obj - array of new values

xmin - double

xmax - double

ymin - double

ymax - double

getGridData

public GridData getGridData()

Gets the GridData object.

Specified by:

getGridData in interface Plot2D

Returns:

GridData

setGridData

public void setGridData(GridData _griddata)

Sets the data storage to the given value.

Specified by:

setGridData in interface Plot2D

Parameters:

_griddata - the new data storage

setIndexes

public void setIndexes(int[] indexes)

Sets the indexes for the data components that will be plotted. Indexes determine the postion of the amplitude, x-component, and y-component in the data array.

Specified by:

setIndexes in interface Plot2D

Parameters:

indexes - the sample-component indexes

setArrowType

public void setArrowType(int type)

Sets this vector field to draw vectors with filled shafts and arrowheads.

Parameters:

type -

setPaletteType

public void setPaletteType(int mode)

Sets the type of palette. Palette types are defined in the ColorMapper class and include: SPECTRUM, BLACK, RED, and BLUE. The default type is SPECTRUM.

Specified by:

setPaletteType in interface Plot2D

Parameters:

mode -

setColorPalette

public void setColorPalette(Color[] colors)

Sets the colors that will be used between the floor and ceiling values. Not implemented in this class.

Specified by:

setColorPalette in interface Plot2D

Parameters:

colors -

setVisible

public void setVisible(boolean vis)

Sets this vector field to be visible. Drawing will be disabled if visible is false.

Specified by:

setVisible in interface Plot2D

Parameters:

vis -

setShowGridLines

public void setShowGridLines(boolean showGrid)

Outlines the data grid's boundaries.

Specified by:

setShowGridLines in interface Plot2D

Parameters:

showGrid -

setGridLineColor

public void setGridLineColor(Color c)

Sets the color for grid line boundaries

Specified by:

setGridLineColor in interface Plot2D

Parameters:

c -

draw

public void draw(DrawingPanel panel,
 Graphics g)

Draws this vector field in the given drawing panel.

Specified by:

draw in interface Drawable

Parameters:

panel -

g -

scaleArrowLenghToGrid

public void scaleArrowLenghToGrid(boolean scaleToGrid)

Sets the autoscale flag for the arrow length.

Parameters:

scaleToGrid -

setAutoscaleZ

public void setAutoscaleZ(boolean isAutoscale,
 double floor,
 double ceil)

Sets the autoscale flag and the floor and ceiling values. If autoscaling is true, then the min and max values of z are set using the data. If autoscaling is false, then floor and ceiling values become the max and min. Values below min map to the first color; values above max map to the last color.

Specified by:

setAutoscaleZ in interface Plot2D

Parameters:

isAutoscale -

floor -

ceil -

setSymmetricZ

public void setSymmetricZ(boolean symmetric)

Forces the z-scale to be symmetric about zero. Not applicable in vector map because vector amplitude is always positive

Specified by:

setSymmetricZ in interface Plot2D

Parameters:

symmetric -

isSymmetricZ

public boolean isSymmetricZ()

Gets the symmetric z flag.

Specified by:

isSymmetricZ in interface Plot2D

isAutoscaleZ

public boolean isAutoscaleZ()

Gets the autoscale flag for z.

Specified by:

isAutoscaleZ in interface Plot2D

Returns:

boolean

getFloor

public double getFloor()

Gets the floor for scaling the z data.

Specified by:

getFloor in interface Plot2D

Returns:

double

getCeiling

public double getCeiling()

Gets the ceiling for scaling the z data.

Specified by:

getCeiling in interface Plot2D

Returns:

double

setFloorCeilColor

public void setFloorCeilColor(Color floorColor,
 Color ceilColor)

Sets the floor and ceiling colors. Not implemented in this class.

Specified by:

setFloorCeilColor in interface Plot2D

Parameters:

floorColor -

ceilColor -

showLegend

public JFrame showLegend()

Shows how values map to colors.

Specified by:

showLegend in interface Plot2D

update

public void update()

Updates the vector field using the data array.

Specified by:

update in interface Plot2D

setExpandedZ

public void setExpandedZ(boolean expanded,
 double expansionFactor)

Expands the z scale so as to enhance values close to zero.

Specified by:

setExpandedZ in interface Plot2D

Parameters:

expanded - boolean

expansionFactor - double

getXMin

public double getXMin()

Description copied from interface: Measurable

Gets the minimum x needed to draw this object.

Specified by:

getXMin in interface Measurable

Returns:

minimum

getXMax

public double getXMax()

Description copied from interface: Measurable

Gets the maximum x needed to draw this object.

Specified by:

getXMax in interface Measurable

Returns:

maximum

getYMin

public double getYMin()

Description copied from interface: Measurable

Gets the minimum y needed to draw this object.

Specified by:

getYMin in interface Measurable

Returns:

minimum

getYMax

public double getYMax()

Description copied from interface: Measurable

Gets the maximum y needed to draw this object.

Specified by:

getYMax in interface Measurable

Returns:

minimum

isMeasured

public boolean isMeasured()

Description copied from interface: Measurable

Determines if information is available to set min/max values. Objects that store data should return false if data is null.

Specified by:

isMeasured in interface Measurable

Returns:

true if min/max values are valid

getLoader

public static XML.ObjectLoader getLoader()

Gets an XML.ObjectLoader to save and load data for this program.

Returns:

the object loader