Package org.anchoranalysis.spatial.scale

Class RelativeScaleCalculator

Object

org.anchoranalysis.spatial.scale.RelativeScaleCalculator

public class RelativeScaleCalculator
extends Object

Determine the scaling-factor needed to scale an Extent to become equal in size to another Extent.

Author:

Owen Feehan

Method Summary

Modifier and Type	Method	Description
static ScaleFactor	relativeScale(Extent source, Extent target)	Calculates a scaling factor so as to scale source to target.
static ScaleFactor	relativeScale(Extent source, Extent target, boolean preserveAspectRatio)	Multiplexes between relativeScalePreserveAspectRatio(Extent, Extent) and relativeScale(Extent, Extent).
static ScaleFactor	relativeScalePreserveAspectRatio(Extent source, Extent target)	Calculates a scaling factor so as to maximally scale source to target - while preserving the aspect ratio.

Methods inherited from class java.lang.Object

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

Method Details

relativeScale

public static ScaleFactor relativeScale(Extent source, Extent target, boolean preserveAspectRatio)

Multiplexes between relativeScalePreserveAspectRatio(Extent, Extent) and relativeScale(Extent, Extent).

Parameters:

source - source extent (only X and Y dimensions are considered).

target - target extent (only X and Y dimensions are considered).

preserveAspectRatio - iff true, the aspect ratio is preserved, and relativeScalePreserveAspectRatio(Extent, Extent) is called, otherwise relativeScale(Extent, Extent).

Returns:

the scaling-factor to scale the source to be the same size as the target.

relativeScalePreserveAspectRatio

public static ScaleFactor relativeScalePreserveAspectRatio(Extent source, Extent target)

Calculates a scaling factor so as to maximally scale source to target - while preserving the aspect ratio.

Either the X or Y dimension is guaranteed to have a scale-factor target / source, and the other will scale so as not to exceed the size of target.

Parameters:

source - source extent (only X and Y dimensions are considered).

target - target extent (only X and Y dimensions are considered).

Returns:

the scaling-factor to scale the source to be the same size as the target.

relativeScale

public static ScaleFactor relativeScale(Extent source, Extent target)

Calculates a scaling factor so as to scale source to target.

i.e. the scale-factor is target / source for each XY dimension.

Parameters:

source - source extent (only X and Y dimensions are considered).

target - target extent (only X and Y dimensions are considered).

Returns:

the scaling-factor to scale the source to be the same size as the target.