Package org.geotools.styling.visitor

Class RescaleStyleVisitor

Object

DuplicatingStyleVisitor

RescaleStyleVisitor

All Implemented Interfaces:

StyleVisitor

Direct Known Subclasses:

DpiRescaleStyleVisitor

public class RescaleStyleVisitor
extends DuplicatingStyleVisitor

This is a style visitor that will produce a copy of the provided style rescaled by a provided factor.

The provided scale will be use to modify all line widths, font sizes and so forth. We may need to go the extra distance and play with the min/max scale on rules, and if there is any DPI specific madness going on we are going to cry.

According to the specification we are supposed to use environmental variables to make our styles render in a resolution independent manner. The current GeoTools environment variable visitor only does processing for mapscale but does not have a dpi substitution. On the plus side this visitor accepts a general Expression and you are free to use an environmental variable expression in order to make sure a normal base style is tweaked in all the right spots.

Author:

Jody Garnett (Refractions Research)

Field Summary

Fields

Modifier and Type	Field	Description
protected Unit<Length>	defaultUnit
protected Expression	scale	This is the scale used as a multiplication factory for everything that has a size.

Fields inherited from class DuplicatingStyleVisitor

copyFilter, ff, pages, sf, STRICT

Constructor Summary

Constructors

Constructor	Description
RescaleStyleVisitor(double scale)
RescaleStyleVisitor(Expression scale)
RescaleStyleVisitor(FilterFactory filterFactory, double scale)
RescaleStyleVisitor(FilterFactory filterFactory, Expression scale)

Method Summary

Modifier and Type	Method	Description
protected List<Expression>	rescale(List<Expression> expressions)	Rescale a list of expressions, can handle null.
protected Expression	rescale(Expression expr)	Used to rescale the provided expr.
protected void	rescaleArrayOption(Map<String,String> options, String key, int defaultValue)	Rescales the specified vendor option
protected List<Expression>	rescaleDashArray(List<Expression> expressions)	Rescale using listMultiply, if there is only one entry.
protected Expression	rescaleGraphicSize(Graphic gr)
protected void	rescaleOption(Map<String,String> options, String key, double defaultValue)	Rescales the specified vendor option
protected void	rescaleOption(Map<String,String> options, String key, int defaultValue)	Rescales the specified vendor option
void	visit(Graphic gr)	Make graphics (such as used with PointSymbolizer) bigger
void	visit(LineSymbolizer sym)	Called when accept is called on a linesymbolizer
void	visit(PointSymbolizer sym)	Called when accept is called on a pointsymbolizer
void	visit(PolygonSymbolizer sym)	Called when accept is called on a polygon symbolizer
void	visit(RasterSymbolizer sym)	Called when accept is called on a rastersymbolizer
void	visit(Stroke stroke)	Increase stroke width.
void	visit(Symbolizer sym)	since it is impossible to create a Symbolizer this method should generate an exception or warning.
void	visit(TextSymbolizer text)	Called when accept is called on a textsymbolizer

Methods inherited from class DuplicatingStyleVisitor

copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copy, copyExpressions, copyFonts, getCopy, setStrict, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class Object

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

Field Detail

scale

protected Expression scale

This is the scale used as a multiplication factory for everything that has a size.

defaultUnit

protected Unit<Length> defaultUnit

Constructor Detail

RescaleStyleVisitor

public RescaleStyleVisitor(double scale)

RescaleStyleVisitor

public RescaleStyleVisitor(Expression scale)

RescaleStyleVisitor

public RescaleStyleVisitor(FilterFactory filterFactory,
                           double scale)

RescaleStyleVisitor

public RescaleStyleVisitor(FilterFactory filterFactory,
                           Expression scale)

Method Detail

rescale

protected Expression rescale(Expression expr)

Used to rescale the provided expr.

We do optimize the case where the provided expression is a literal; no sense doing a calculation each time if we don't have to.

Returns:

expr multiplied by the provided scale

rescale

protected List<Expression> rescale(List<Expression> expressions)

Rescale a list of expressions, can handle null.

rescaleDashArray

protected List<Expression> rescaleDashArray(List<Expression> expressions)

Rescale using listMultiply, if there is only one entry.

visit

public void visit(Stroke stroke)

Increase stroke width.

Based on feedback we may need to change the dash array as well.

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

stroke - the stroke to visit

visit

public void visit(Graphic gr)

Make graphics (such as used with PointSymbolizer) bigger

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

gr - the graphic to visit

rescaleGraphicSize

protected Expression rescaleGraphicSize(Graphic gr)

visit

public void visit(TextSymbolizer text)

Description copied from interface: StyleVisitor

Called when accept is called on a textsymbolizer

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

text - the text symbolizer to visit

visit

public void visit(Symbolizer sym)

Description copied from interface: StyleVisitor

since it is impossible to create a Symbolizer this method should generate an exception or warning.

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

sym - the symbolizer to visit

visit

public void visit(PointSymbolizer sym)

Description copied from interface: StyleVisitor

Called when accept is called on a pointsymbolizer

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

sym - the point symbolizer to visit

visit

public void visit(LineSymbolizer sym)

Description copied from interface: StyleVisitor

Called when accept is called on a linesymbolizer

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

sym - the line symbolizer to visit

visit

public void visit(PolygonSymbolizer sym)

Description copied from interface: StyleVisitor

Called when accept is called on a polygon symbolizer

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

sym - the polygon symbolizer to visit

visit

public void visit(RasterSymbolizer sym)

Description copied from interface: StyleVisitor

Called when accept is called on a rastersymbolizer

Specified by:

visit in interface StyleVisitor

Overrides:

visit in class DuplicatingStyleVisitor

Parameters:

sym - the raster symbolizer to visit

rescaleOption

protected void rescaleOption(Map<String,String> options,
                             String key,
                             double defaultValue)

Rescales the specified vendor option

rescaleOption

protected void rescaleOption(Map<String,String> options,
                             String key,
                             int defaultValue)

Rescales the specified vendor option

rescaleArrayOption

protected void rescaleArrayOption(Map<String,String> options,
                                  String key,
                                  int defaultValue)

Rescales the specified vendor option