uk.ac.starlink.ttools.plot2.layer

Interface FunctionPlotter.FuncAxis

Enclosing class:

FunctionPlotter

public static interface FunctionPlotter.FuncAxis

Defines the geometric role of the dependent and independent variables for a function.

Method Summary

Modifier and Type	Method and Description
String	getAxisName() Returns the name of the geometry type for this object.
double[]	getXValues(Surface surface) Returns the values of the independent variable at which the function must be evaluated for a given plot surface.
boolean	xfToData(Surface surface, double x, double f, double[] dataPos) Converts the result of a function evaluation to a position in the data space of the plot.

Method Detail

getAxisName

String getAxisName()

Returns the name of the geometry type for this object. Typically this will be the name of the axis along which the independent variable runs, if there is one.

Returns:

function geometry name

getXValues

double[] getXValues(Surface surface)

Returns the values of the independent variable at which the function must be evaluated for a given plot surface. The drawn line will consist of a line drawn through the function evaluations at these values of the independent variable. The result should usually include some values a bit off the edge of the visible part of the surface if applicable so that the line goes right to the edge of the clipped region.

Parameters:

surface - plot surface on which function will be drawn

Returns:

array of independent variable values

xfToData

boolean xfToData(Surface surface,
                 double x,
                 double f,
                 double[] dataPos)

Converts the result of a function evaluation to a position in the data space of the plot.

Parameters:

surface - plotting surface

x - independent variable

f - dependent variable

dataPos - nDataDim-element array to receive data position corresponding to x,f(x)

Returns:

true iff a valid data position resulted