org.jplot2d.transform

Class LogarithmicNormalTransform

java.lang.Object

org.jplot2d.transform.NormalTransform

org.jplot2d.transform.LogarithmicNormalTransform

public class LogarithmicNormalTransform
extends NormalTransform

Performs a log transformation on Cartesian axes. The equation is worldvalue = 10^(scale * normalized v + offset)

Field Summary

Fields inherited from class org.jplot2d.transform.NormalTransform

NORMAL_RANGE

Constructor Summary

Constructors

Constructor and Description
LogarithmicNormalTransform(double u1, double u2)
LogarithmicNormalTransform(Range ur)

Method Summary

Modifier and Type	Method and Description
double	convFromNR(double p) Transform a value from normalized range to value range.
double	convToNR(double w) Transform from user to normalized coordinates.
Transform1D	createTransform(double d1, double d2) Create a Transform1D by assign a dest range.
NormalTransform	deriveNoOffset() Derive a new NormalTransform with offset set to 0;
boolean	equals(java.lang.Object o)
double	getMinPSpan4PrecisionLimit(double pLo, double pHi, double precisionLimit) t: the precision limit; u: the abs larger user point of range to zoom in The formula: p = _a * u + _b *
double	getOffset()
Range	getRange4PrecisionLimit(Range range, double precisionLimit)
double	getScale()
TransformType	getType()
Range	getValueRange() Returns the value range of this transform.
NormalTransform	invert()
NormalTransform	zoom(Range npr)

Methods inherited from class org.jplot2d.transform.NormalTransform

convFromNR, convToNR, isInverted, toString

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LogarithmicNormalTransform

public LogarithmicNormalTransform(Range ur)

LogarithmicNormalTransform

public LogarithmicNormalTransform(double u1,
                                  double u2)

Method Detail

getType

public TransformType getType()

Specified by:

getType in class NormalTransform

getScale

public double getScale()

Specified by:

getScale in class NormalTransform

getOffset

public double getOffset()

Specified by:

getOffset in class NormalTransform

convToNR

public double convToNR(double w)

Transform from user to normalized coordinates.

Specified by:

convToNR in class NormalTransform

Parameters:

u - user value

Returns:

normalized value

convFromNR

public double convFromNR(double p)

Description copied from class: NormalTransform

Transform a value from normalized range to value range.

Specified by:

convFromNR in class NormalTransform

Parameters:

p - normalized value

Returns:

world value

deriveNoOffset

public NormalTransform deriveNoOffset()

Description copied from class: NormalTransform

Derive a new NormalTransform with offset set to 0;

Specified by:

deriveNoOffset in class NormalTransform

Returns:

the derived NormalTransform

zoom

public NormalTransform zoom(Range npr)

Specified by:

zoom in class NormalTransform

invert

public NormalTransform invert()

Specified by:

invert in class NormalTransform

getMinPSpan4PrecisionLimit

public double getMinPSpan4PrecisionLimit(double pLo,
                                         double pHi,
                                         double precisionLimit)

t: the precision limit; u: the abs larger user point of range to zoom in
The formula: p = _a * u + _b *

         u'/u > 1 - t
         10ˆ(_ap'-_b)/10ˆ(_ap-_b) > 1-t
         10ˆ(_a(p'-p)) > 1-t
         _a(p'-p) > log10(1-t)
         dP > log10(1-t)/abs(_a)
 

Specified by:

getMinPSpan4PrecisionLimit in class NormalTransform

getRange4PrecisionLimit

public Range getRange4PrecisionLimit(Range range,
                                     double precisionLimit)

getValueRange

public Range getValueRange()

Description copied from class: NormalTransform

Returns the value range of this transform.

Specified by:

getValueRange in class NormalTransform

Returns:

the value range

createTransform

public Transform1D createTransform(double d1,
                                   double d2)

Description copied from class: NormalTransform

Create a Transform1D by assign a dest range.

Specified by:

createTransform in class NormalTransform

Parameters:

d1 - the start value of dest range

d2 - the end value of dest range

Returns:

a Transform1D

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object