de.lmu.ifi.dbs.elki.visualization.scales
Class LinearScale

java.lang.Object
  de.lmu.ifi.dbs.elki.visualization.scales.LinearScale

public class LinearScale
extends Object

Class to handle a linear scale for an axis. The computed scales are rounded to be on decimal borders, choosing an appropriate resolution to have between 4 and 31 major tics (3 to 30 intervals). Future versions might use major/minor tics to get even nicer values.

Author:

Erich Schubert

Field Summary

private double	delta Scale delta := max - min
private int	log10res Scale resolution in log10.
private double	max max value of the scale
private double	min min value of the scale
private double	res Scale resolution
private double	ZOOMFACTOR

Constructor Summary

LinearScale(double min, double max)
Constructor.

Method Summary

String	formatValue(double val) Format value according to the scales resolution (i.e. appropriate number of digits)
double	getLog10Res() Get resolution (scale interval size)
double	getMax() Get maximum value (scale, not data).
double	getMin() Get minimum value (scale, not data).
double	getRes() Get resolution (scale interval size)
double	getScaled(double val) Covert a value to it's scale position

Methods inherited from class java.lang.Object

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

Field Detail

ZOOMFACTOR

private final double ZOOMFACTOR

min

private double min

min value of the scale

max

private double max

max value of the scale

res

private double res

Scale resolution

log10res

private int log10res

Scale resolution in log10.

delta

private double delta

Scale delta := max - min

Constructor Detail

LinearScale

public LinearScale(double min,
                   double max)

Constructor. Computes a scale covering the range of min-max with between 3 and 30 intervals, rounded to the appropriate number of digits.

Parameters:

min - actual minimum in the data

max - actual maximum in the data

Method Detail

getMin

public double getMin()

Get minimum value (scale, not data).

Returns:

min

getMax

public double getMax()

Get maximum value (scale, not data).

Returns:

max

getRes

public double getRes()

Get resolution (scale interval size)

Returns:

scale interval size

getLog10Res

public double getLog10Res()

Get resolution (scale interval size)

Returns:

scale interval size in logarithmic form

getScaled

public double getScaled(double val)

Covert a value to it's scale position

Parameters:

val - data value

Returns:

scale position in the interval [0:1]

formatValue

public String formatValue(double val)

Format value according to the scales resolution (i.e. appropriate number of digits)

Parameters:

val -

Returns:

formatted number