Package org.geotools.styling.zoom

Class RatioZoomContext

Object

MedialZoomContext

ContinuousZoomContext

RatioZoomContext

All Implemented Interfaces:

ZoomContext

Direct Known Subclasses:

RatioZoomContext

public class RatioZoomContext
extends ContinuousZoomContext
implements ZoomContext

ZoomContext defined by an initial scale and a ratio between levels.

Author:

Kevin Smith, Boundless

Field Summary

Fields inherited from interface ZoomContext

HINT_ID

Constructor Summary

Constructors

Constructor	Description
RatioZoomContext(double initialScale, double ratio)	Create a zoom context where zoom level 0 has a scale denominator of initial, and each subsequent level is ratio times that.
RatioZoomContext(int initialLevel, double initialScale, double ratio)	Create a zoom context where zoom level initialLevel has a scale denominator of initial, and each subsequent level is ratio times that.

Method Summary

Modifier and Type	Method	Description
protected double	getMedialScale(int level)	Get a scale between the given zoom level and the next
protected double	getScaleDenominator(double level)	Find the reciprocal of the scale at a specified zoom level in this context.
boolean	isInRange(int level)	Is the given level within the range for which the context has clearly defined scales.

Methods inherited from class ContinuousZoomContext

getScaleDenominator

Methods inherited from class MedialZoomContext

getRange

Methods inherited from class Object

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

Methods inherited from interface ZoomContext

getRange, getScaleDenominator

Constructor Details

RatioZoomContext

public RatioZoomContext(double initialScale,
 double ratio)

Create a zoom context where zoom level 0 has a scale denominator of initial, and each subsequent level is ratio times that.

Parameters:

initialScale - scale denominator at level 0

ratio - ratio between zoom levels

RatioZoomContext

public RatioZoomContext(int initialLevel,
 double initialScale,
 double ratio)

Create a zoom context where zoom level initialLevel has a scale denominator of initial, and each subsequent level is ratio times that.

Parameters:

initialLevel - Level to use as initial

initialScale - scale denominator at level initialLevel

ratio - ratio between the scale at consecutive zoom levels. Zoom level z+1 has a scale ratio times that of z and a scale denominator 1/ratio times that of z.

Method Details

getScaleDenominator

protected double getScaleDenominator(double level)

Description copied from class: ContinuousZoomContext

Find the reciprocal of the scale at a specified zoom level in this context.

Specified by:

getScaleDenominator in class ContinuousZoomContext

Parameters:

level - The level

Returns:

The scale denominator

getMedialScale

protected double getMedialScale(int level)

Description copied from class: ContinuousZoomContext

Get a scale between the given zoom level and the next

Overrides:

getMedialScale in class ContinuousZoomContext

isInRange

public boolean isInRange(int level)

Description copied from interface: ZoomContext

Is the given level within the range for which the context has clearly defined scales.

Specified by:

isInRange in interface ZoomContext