/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2007-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.styling.visitor;
import static org.geotools.styling.TextSymbolizer.*;
import java.util.Map;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.styling.Displacement;
import org.geotools.styling.ExternalGraphic;
import org.geotools.styling.Font;
import org.geotools.styling.Graphic;
import org.geotools.styling.LabelPlacement;
import org.geotools.styling.LinePlacement;
import org.geotools.styling.Mark;
import org.geotools.styling.PointPlacement;
import org.geotools.styling.Stroke;
import org.geotools.styling.Symbol;
import org.geotools.styling.TextSymbolizer;
import org.geotools.util.Converters;
import org.opengis.filter.FilterFactory2;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.expression.Literal;
/**
* This is a style visitor that will produce a copy of the provided
* style rescaled by a provided factor.
* <p>
* 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.
* <p>
* 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 <b>mapscale</b>
* 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.
* <p>
*
* @author Jody Garnett (Refractions Research)
*
*
* @source $URL$
*/
public class RescaleStyleVisitor extends DuplicatingStyleVisitor {
/**
* This is the scale used as a multiplication factory for everything that
* has a size.
*/
private Expression scale;
public RescaleStyleVisitor( double scale ){
this( CommonFactoryFinder.getFilterFactory2(null), scale );
}
public RescaleStyleVisitor( Expression scale){
this( CommonFactoryFinder.getFilterFactory2(null), scale );
}
public RescaleStyleVisitor(FilterFactory2 filterFactory, double scale) {
this( filterFactory, filterFactory.literal(scale));
}
public RescaleStyleVisitor(FilterFactory2 filterFactory, Expression scale) {
super( CommonFactoryFinder.getStyleFactory( null ), filterFactory );
this.scale = scale;
}
/**
* Used to rescale the provided expr.
* <p>
* 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.
*
* @param expr
* @return expr multiplied by the provided scale
*/
protected Expression rescale( Expression expr ) {
if(expr == null) {
return null;
}
if(expr == Expression.NIL) {
return Expression.NIL;
}
Expression rescale = ff.multiply( scale, expr );
if( expr instanceof Literal && scale instanceof Literal){
double constant = (double) rescale.evaluate(null, Double.class);
return ff.literal(constant);
}
return rescale;
}
/**
* Increase stroke width.
* <p>
* Based on feedback we may need to change the dash array as well.
* <p>
*/
public void visit(org.geotools.styling.Stroke stroke) {
Stroke copy = sf.getDefaultStroke();
copy.setColor( copy(stroke.getColor()));
copy.setDashArray( rescale(stroke.getDashArray()));
copy.setDashOffset( rescale(stroke.getDashOffset()));
copy.setGraphicFill( copy(stroke.getGraphicFill()));
copy.setGraphicStroke( copy( stroke.getGraphicStroke()));
copy.setLineCap(copy(stroke.getLineCap()));
copy.setLineJoin( copy(stroke.getLineJoin()));
copy.setOpacity( copy(stroke.getOpacity()));
copy.setWidth( rescale(stroke.getWidth()));
pages.push(copy);
}
float[] rescale(float[] original) {
if(original == null) {
return null;
}
// rescale the dash array if possible
float[] rescaled = new float[original.length];
float scaleFactor = 1;
if( scale instanceof Literal){
scaleFactor = scale.evaluate(null, Float.class);
}
for (int i = 0; i < rescaled.length; i++) {
rescaled[i] = scaleFactor * original[i];
}
return rescaled;
}
/** Make graphics (such as used with PointSymbolizer) bigger */
public void visit(Graphic gr) {
Graphic copy = null;
Displacement displacementCopy = null;
if (gr.getDisplacement() != null) {
gr.getDisplacement().accept(this);
displacementCopy = (Displacement) pages.pop();
}
ExternalGraphic[] externalGraphics = gr.getExternalGraphics();
ExternalGraphic[] externalGraphicsCopy = new ExternalGraphic[externalGraphics.length];
int length=externalGraphics.length;
for (int i = 0; i < length; i++) {
externalGraphicsCopy[i] = copy( externalGraphics[i]);
}
Mark[] marks = gr.getMarks();
Mark[] marksCopy = new Mark[marks.length];
length=marks.length;
for (int i = 0; i < length; i++) {
marksCopy[i] = copy( marks[i]);
}
Expression opacityCopy = copy( gr.getOpacity() );
Expression rotationCopy = copy( gr.getRotation() );
Expression sizeCopy = rescale( gr.getSize() );
Symbol[] symbols = gr.getSymbols();
length=symbols.length;
Symbol[] symbolCopys = new Symbol[length];
for (int i = 0; i < length; i++) {
symbolCopys[i] = copy( symbols[i] );
}
copy = sf.createDefaultGraphic();
copy.setDisplacement(displacementCopy);
copy.setExternalGraphics(externalGraphicsCopy);
copy.setMarks(marksCopy);
copy.setOpacity((Expression) opacityCopy);
copy.setRotation((Expression) rotationCopy);
copy.setSize((Expression) sizeCopy);
copy.setSymbols(symbolCopys);
pages.push(copy);
}
@Override
public void visit(TextSymbolizer text) {
super.visit(text);
TextSymbolizer copy = (TextSymbolizer) pages.peek();
// rescales fonts
Font[] fonts = copy.getFonts();
for (Font font : fonts) {
font.setSize(rescale(font.getSize()));
}
copy.setFonts(fonts);
// rescales label placement
LabelPlacement placement = copy.getLabelPlacement();
if (placement instanceof PointPlacement) {
// rescales point label placement
PointPlacement pointPlacement = (PointPlacement) placement;
Displacement disp = pointPlacement.getDisplacement();
if (disp != null) {
disp.setDisplacementX(rescale(disp.getDisplacementX()));
disp.setDisplacementY(rescale(disp.getDisplacementY()));
pointPlacement.setDisplacement(disp);
}
} else if (placement instanceof LinePlacement) {
// rescales line label placement
LinePlacement linePlacement = (LinePlacement) placement;
linePlacement.setGap(rescale(linePlacement.getGap()));
linePlacement.setInitialGap(rescale(linePlacement.getInitialGap()));
linePlacement.setPerpendicularOffset(rescale(linePlacement.getPerpendicularOffset()));
}
copy.setLabelPlacement(placement);
// rescale the halo
if(copy.getHalo() != null) {
copy.getHalo().setRadius(rescale(copy.getHalo().getRadius()));
}
// deal with the format options specified in pixels
Map<String, String> options = copy.getOptions();
rescaleOption(options, SPACE_AROUND_KEY, DEFAULT_SPACE_AROUND);
rescaleOption(options, MAX_DISPLACEMENT_KEY, DEFAULT_MAX_DISPLACEMENT);
rescaleOption(options, MIN_GROUP_DISTANCE_KEY, DEFAULT_MIN_GROUP_DISTANCE);
rescaleOption(options, LABEL_REPEAT_KEY, DEFAULT_LABEL_REPEAT);
rescaleOption(options, AUTO_WRAP_KEY, DEFAULT_AUTO_WRAP);
}
/**
* Rescales the specified vendor option
* @param options
* @param key
* @param defaultAutoWrap
* @param value
*/
protected void rescaleOption(Map<String, String> options, String key, double defaultValue) {
double scaleFactor = (double) scale.evaluate(null, Double.class);
if(options.get(key) != null) {
double rescaled = Converters.convert(options.get(key), Double.class) * scaleFactor;
options.put(key, String.valueOf(rescaled));
} else if(defaultValue != 0) {
options.put(key, String.valueOf(defaultValue * scaleFactor));
}
};
/**
* Rescales the specified vendor option
* @param options
* @param key
* @param defaultAutoWrap
* @param value
*/
protected void rescaleOption(Map<String, String> options, String key, int defaultValue) {
double scaleFactor = (double) scale.evaluate(null, Double.class);
if(options.get(key) != null) {
int rescaled = (int) Math.round(Converters.convert(options.get(key), Double.class) * scaleFactor);
options.put(key, String.valueOf(rescaled));
} else if(defaultValue != 0) {
options.put(key, String.valueOf((int) Math.round(defaultValue * scaleFactor)));
}
};
}