Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

 *

 * $Id: GeneralLabelingStrategy.java 13749 2007-09-17 14:16:11Z jaume $

 * $Log$

 * Revision 1.2  2007-09-17 14:16:11  jaume

 * multilayer symbols sizing bug fixed

 *

 * Revision 1.1  2007/05/22 12:17:41  jaume

 * *** empty log message ***

 *

 * Revision 1.1  2007/05/22 10:05:31  jaume

 * *** empty log message ***

 *

 * Revision 1.10  2007/05/17 09:32:06  jaume

 * *** empty log message ***

 *

 * Revision 1.9  2007/05/09 11:04:58  jaume

 * refactored legend hierarchy

 *

 * Revision 1.8  2007/04/13 11:59:30  jaume

 * *** empty log message ***

 *

 * Revision 1.7  2007/04/12 14:28:43  jaume

 * basic labeling support for lines

 *

 * Revision 1.6  2007/04/11 16:01:08  jaume

 * maybe a label placer refactor

 *

 * Revision 1.5  2007/04/10 16:34:01  jaume

 * towards a styled labeling

 *

 * Revision 1.4  2007/04/02 16:34:56  jaume

 * Styled labeling (start commiting)

 *

 * Revision 1.3  2007/03/28 16:48:01  jaume

 * *** empty log message ***

 *

 * Revision 1.2  2007/03/26 14:40:38  jaume

 * added print method (BUT UNIMPLEMENTED)

 *

 * Revision 1.1  2007/03/20 16:16:20  jaume

 * refactored to use ISymbol instead of FSymbol

 *

 * Revision 1.2  2007/03/09 11:20:57  jaume

 * Advanced symbology (start committing)

 *

 * Revision 1.1  2007/03/09 08:33:43  jaume

 * *** empty log message ***

 *

 * Revision 1.1.2.5  2007/02/21 07:34:08  jaume

 * labeling starts working

 *

 * Revision 1.1.2.4  2007/02/15 16:23:44  jaume

 * *** empty log message ***

 *

 * Revision 1.1.2.3  2007/02/09 07:47:05  jaume

 * Isymbol moved

 *

 * Revision 1.1.2.2  2007/02/02 16:21:24  jaume

 * start commiting labeling stuff

 *

 * Revision 1.1.2.1  2007/02/01 17:46:49  jaume

 * *** empty log message ***

 *

 *

 */

package org.gvsig.symbology.fmap.labeling;

import java.awt.Graphics2D;

import java.awt.geom.NoninvertibleTransformException;

import java.awt.geom.PathIterator;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.CharArrayReader;

import java.io.StringReader;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.Hashtable;

import java.util.TreeSet;

import javax.print.attribute.PrintRequestAttributeSet;

import org.apache.log4j.Logger;

import org.cresques.cts.ICoordTrans;

import org.gvsig.symbology.fmap.labeling.parse.LabelExpressionParser;

import org.gvsig.symbology.fmap.labeling.parse.ParseException;

import org.gvsig.symbology.fmap.labeling.placements.AbstractPlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.ILabelPlacement;

import org.gvsig.symbology.fmap.labeling.placements.LinePlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.MultiShapePlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.PointPlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.PolygonPlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.PolygonPlacementOnCentroid;

import org.gvsig.symbology.fmap.labeling.placements.PolygonPlacementParallel;

import org.gvsig.symbology.fmap.labeling.placements.RemoveDuplicatesComparator;

import org.gvsig.symbology.fmap.rendering.filter.operations.Expression;

import org.gvsig.symbology.fmap.rendering.filter.operations.ExpressionException;

import org.gvsig.symbology.fmap.symbols.SmartTextSymbol;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

import com.hardcode.gdbms.engine.values.Value;

import com.iver.andami.PluginServices;

import com.iver.cit.gvsig.fmap.MapContext;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.core.CartographicSupport;

import com.iver.cit.gvsig.fmap.core.CartographicSupportToolkit;

import com.iver.cit.gvsig.fmap.core.FShape;

import com.iver.cit.gvsig.fmap.core.GeneralPathX;

import com.iver.cit.gvsig.fmap.core.IFeature;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.core.SymbologyFactory;

import com.iver.cit.gvsig.fmap.core.symbols.ITextSymbol;

import com.iver.cit.gvsig.fmap.core.v02.FConstant;

import com.iver.cit.gvsig.fmap.core.v02.FConverter;

import com.iver.cit.gvsig.fmap.drivers.IFeatureIterator;

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.FLyrVect;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.ILabelingMethod;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.ILabelingStrategy;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.IPlacementConstraints;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.IZoomConstraints;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelClass;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelLocationMetrics;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelingFactory;

import com.iver.utiles.XMLEntity;

import com.iver.utiles.swing.threads.Cancellable;

/**

 *

 * GeneralLabelingStrategy.java

 *

 *

 * @author jaume dominguez faus - jaume.dominguez@iver.es Jan 4, 2008

 *

 */

public class GeneralLabelingStrategy implements ILabelingStrategy, Cloneable,CartographicSupport {

        public static IPlacementConstraints DefaultPointPlacementConstraints = new PointPlacementConstraints();

        public static IPlacementConstraints DefaultLinePlacementConstraints = new LinePlacementConstraints();

        public static IPlacementConstraints DefaultPolygonPlacementConstraints = new PolygonPlacementConstraints();

        private static String[] NO_TEXT = {PluginServices.getText(null, "text_field")};

        private static MultiShapePlacementConstraints DefaultMultiShapePlacementConstratints = new MultiShapePlacementConstraints();

        private ILabelingMethod method;

        private IPlacementConstraints placementConstraints;

        protected FLyrVect layer;

        private IZoomConstraints zoomConstraints;

        private boolean allowOverlapping;

        private long parseTime;

        private int unit;

        private int referenceSystem;

        private double sizeAfter;

        public void setLayer(FLayer layer) throws ReadDriverException {

                FLyrVect l = (FLyrVect) layer;

                this.layer = l;

        }

        public ILabelingMethod getLabelingMethod() {

                return method;

        }

        public void setLabelingMethod(ILabelingMethod method) {

                this.method = method;

        }

        public void draw(BufferedImage mapImage, Graphics2D mapGraphics,

                        ViewPort viewPort,        Cancellable cancel, double dpi) throws ReadDriverException {

//                boolean bVisualFXEnabled = false; // if true, the user can see how the labeling is drawing up

                TreeSet<?> placedLabels = null;

                parseTime =0;

                long t1 = System.currentTimeMillis();

                String[] usedFields = getUsedFields();

                int notPlacedCount = 0;

                int placedCount = 0;

                /*

                 * Get the label placement solvers according the user's settings

                 */

                ILabelPlacement placement = PlacementManager.getPlacement(getPlacementConstraints(), layer.getShapeType());

                /*

                 * get an ordered set of the LabelClasses up on the

                 * label priority

                 */

                LabelClass[] lcs = method.getLabelClasses();

                TreeSet<LabelClass> ts = new TreeSet<LabelClass>(new LabelClassComparatorByPriority());

                for (int i = 0; i < lcs.length; i++) ts.add(lcs[i]);

                if (ts.size()==0) return;

//                // -- visual FX stuff

//                BufferedImage visualFXim = null;

//                Graphics2D visualFXgr = null;

//                if (bVisualFXEnabled) {

//                visualFXim = new BufferedImage(mapImage.getWidth(),

//                mapImage.getHeight(),

//                BufferedImage.TYPE_INT_ARGB);

//                visualFXgr = visualFXim.createGraphics();

//                visualFXgr.drawImage(mapImage, null, null);

//                }

//                int drawEach = 300; // (milliseconds)

//                long lastTime = System.currentTimeMillis();

//                // -- end visual FX stuff

                /*

                 * now we have an ordered set, it is only need to give a pass

                 * for each label class to render by priorities.

                 *

                 * If no priorities were defined, the following loop only executes

                 * once

                 */

                for (LabelClass lc : ts) {

                        IFeatureIterator it =  method.getFeatureIteratorByLabelClass(layer, lc, viewPort, usedFields);

                        // duplicates treatment stuff

                        /* handle the duplicates mode */

                        int duplicateMode = getDuplicateLabelsMode();

                        if (duplicateMode == IPlacementConstraints.REMOVE_DUPLICATE_LABELS) {

                                // we need to register the labels already placed

                                if (placedLabels == null)

                                        placedLabels = new TreeSet<String[]>(

                                                        new RemoveDuplicatesComparator());

                                        else placedLabels.clear();

                        }

                        boolean bLabelsReallocatable = !isAllowingOverlap();

                        BufferedImage overlapDetectImage = null;

                        Graphics2D overlapDetectGraphics = null;

                        if (bLabelsReallocatable) {

                                overlapDetectImage = new BufferedImage(

                                                viewPort.getImageWidth()+(int)viewPort.getOffset().getX(),

                                                viewPort.getImageHeight()+(int)viewPort.getOffset().getY(),

                                                BufferedImage.TYPE_INT_ARGB

                                );

                                overlapDetectGraphics = overlapDetectImage.createGraphics();

                                overlapDetectGraphics.setRenderingHints(mapGraphics.getRenderingHints());

                        }

                        while ( !cancel.isCanceled() && it.hasNext()) {

                                IFeature feat = it.next();

                                IGeometry geom = feat.getGeometry();

                                if (!setupLabel(feat, lc, cancel, usedFields, viewPort, dpi, duplicateMode, placedLabels))

                                        continue;

                                // Check if size is a pixel

                                if (isOnePoint(viewPort, geom)) {

                                        continue;

                                }

                                ArrayList<LabelLocationMetrics> llm = null;

                                // Calculate the label possible places

//                                if (placement instanceof PolygonPlacementOnCentroid){

//                                llm = ((PolygonPlacementOnCentroid)placement).guess(

//                                lc,

//                                (FShape)geom.getInternalShape(),

//                                getPlacementConstraints(),

//                                0,

//                                cancel,viewPort);

//                                }else if(placement instanceof PolygonPlacementParallel){

//                                llm = ((PolygonPlacementParallel)placement).guess(

//                                lc,

//                                (FShape)geom.getInternalShape(),

//                                getPlacementConstraints(),

//                                0,

//                                cancel,viewPort);

//                                }else{

//                                llm = placement.guess(

//                                lc,

//                                FConverter.transformToInts(geom, viewPort.getAffineTransform()),

//                                getPlacementConstraints(),

//                                0,

//                                cancel);

//                                }

                                llm = placement.guess(

                                                lc,

                                                geom,

                                                getPlacementConstraints(),

                                                0,

                                                cancel,viewPort);

                                BufferedImage targetBI;

                                Graphics2D targetGr;

                                if (bLabelsReallocatable) {

                                        targetBI = overlapDetectImage;

                                        targetGr = overlapDetectGraphics;

                                } else {

//                                        // -- visual FX stuff

//                                        if (bVisualFXEnabled) {

//                                        targetBI = visualFXim;

//                                        targetGr = visualFXgr;

//                                        } else {

//                                        // -- end visual FX stuff

                                        targetBI = mapImage;

                                        targetGr = mapGraphics;

//                                        }

                                }

                                setReferenceSystem(lc.getReferenceSystem());

                                setUnit(lc.getUnit());

                                double sizeBefore = lc.getTextSymbol().getFont().getSize();

                                sizeAfter = CartographicSupportToolkit.getCartographicLength(this,

                                                sizeBefore,

                                                viewPort,

                                                MapContext.getScreenDPI());

                                /*

                                 * search if there is room left by the previous and

                                 * with more priority labels, then check the current

                                 * level

                                 */

                                if (lookupAndPlaceLabel(targetBI, targetGr, llm,

                                                placement, lc, geom, viewPort, cancel,        bLabelsReallocatable)) {

                                        placedCount++;

                                } else {

                                        notPlacedCount++;

                                }

                                lc.getTextSymbol().setFontSize(sizeBefore);

//                                // -- visual FX stuff

//                                if (bVisualFXEnabled && System.currentTimeMillis() - lastTime > drawEach) {

//                                lastTime = System.currentTimeMillis();

//                                mapGraphics.drawImage(visualFXim, null, null);

//                                }

//                                // -- end visual FX stuff

                        }

                        if (bLabelsReallocatable) {

//                                // -- visual FX stuff

//                                if (bVisualFXEnabled)

//                                visualFXgr.drawImage(overlapDetectImage, null, null);

//                                else

//                                // -- end visual FX stuff

                                mapGraphics.drawImage(overlapDetectImage, null, null);

                        }

                }

                int total = placedCount+notPlacedCount;

                double totalTime = (System.currentTimeMillis()-t1);

                if (total>0)

                        Logger.getLogger(getClass()).info("Labeled layer '"+layer.getName()+

                                        "' "+totalTime/1000D+" seconds. "+placedCount+"/"+total+

                                        " labels placed ("+NumberFormat.getInstance().

                                        format(100*placedCount/(double) total)+"%)");

                if (cancel.isCanceled()) {

                        Logger.getLogger(getClass()).info("Layer labeling canceled: '"+

                                        layer.getName()+"'");

                } else {

                        Logger.getLogger(getClass()).info("Total labels parse time = "+

                                        parseTime+" ("+NumberFormat.getInstance().

                                        format(parseTime*100/totalTime)+"%)");

                }

//                // -- visual FX stuff

//                if (bVisualFXEnabled) {

//                mapGraphics.drawImage(visualFXim, null, null);

//                }

//                // -- end visual FX stuff

        }

        private int getDuplicateLabelsMode() {

                if (getPlacementConstraints() == null) {

                        return IPlacementConstraints.DefaultDuplicateLabelsMode;

                }

                return getPlacementConstraints().getDuplicateLabelsMode();

        }

        private boolean lookupAndPlaceLabel(BufferedImage bi, Graphics2D g,

                        ArrayList<LabelLocationMetrics> llm, ILabelPlacement placement,

                        LabelClass lc, IGeometry geom,        ViewPort viewPort,

                        Cancellable cancel, boolean bLabelsReallocatable) {

                int i;

                for (i = 0; !cancel.isCanceled() && i < llm.size(); i++) {

                        LabelLocationMetrics labelMetrics = llm.get(i);

                        if (bLabelsReallocatable) {

                                if (!isOverlapping(bi, lc.getShape(labelMetrics))) {

                                        lc.getTextSymbol().setFontSize(sizeAfter * FConstant.FONT_HEIGHT_SCALE_FACTOR);

                                        if(!getPlacementConstraints().isFollowingLine()){

                                                lc.draw(g, labelMetrics, (FShape) geom.getInternalShape());

                                        }

                                        else{

                                                SmartTextSymbolLabelClass smsLc = new SmartTextSymbolLabelClass();

                                                SmartTextSymbol sms = new SmartTextSymbol(lc.getTextSymbol(),getPlacementConstraints());

                                                smsLc.setTextSymbol(sms);

                                                geom.transform(viewPort.getAffineTransform());

                                                smsLc.draw(g, null, (FShape) geom.getInternalShape());

                                        }

                                        return true;

                                }

                        } else {

                                lc.getTextSymbol().setFontSize(sizeAfter * FConstant.FONT_HEIGHT_SCALE_FACTOR);

                                if(!getPlacementConstraints().isFollowingLine()){

                                        lc.draw(g, labelMetrics, null);

                                }

                                else{

                                        SmartTextSymbolLabelClass smsLc = new SmartTextSymbolLabelClass();

                                        SmartTextSymbol sms = new SmartTextSymbol(lc.getTextSymbol(),getPlacementConstraints());

                                        smsLc.setTextSymbol(sms);

                                        geom.transform(viewPort.getAffineTransform());

                                        smsLc.draw(g, null, (FShape) geom.getInternalShape());

                                }

                                return true;

                        }

                }

                return false;

        }

        @SuppressWarnings("unchecked")

        private boolean setupLabel(IFeature feat, LabelClass lc,

                        Cancellable cancel, String[] usedFields, ViewPort viewPort,

                        double dpi, int duplicateMode, TreeSet<?> placedLabels) {

                Value[] vv = feat.getAttributes();

                String expr = lc.getStringLabelExpression();

                long pt1 = System.currentTimeMillis();

                String[] texts = NO_TEXT;

//                String[] texts = {PluginServices.getText(this, "text_field")};

                try {

                        for (int i = 0; !cancel.isCanceled() && i < usedFields.length; i++) {

                                try {

                                        int index = layer.getSource().getRecordset().getFieldIndexByName(usedFields[i]);

                                        if(index != -1)

                                                symbol_table.put(usedFields[i], feat.getAttribute(index));

                                } catch (ReadDriverException e) {

                                        // TODO Auto-generated catch block

                                        e.printStackTrace();

                                }

                        }

                        if (expr != null) {

                                if(expr.equals("") || expr.equals(LabelExpressionParser.tokenFor(LabelExpressionParser.EOEXPR)))

                                        expr = texts[0];

                                // parse (if it hasn't been parsed yet) and evaluate the expression

                                Object labelContents = getEvaluator(expr).evaluate();

                                if (String[].class.equals(labelContents.getClass())) {

                                        texts = (String[]) labelContents;

                                } else {

                                        texts = new String[] { labelContents.toString() };

                                }

                                parseTime += System.currentTimeMillis()-pt1;

                        }

                        if (duplicateMode == IPlacementConstraints.REMOVE_DUPLICATE_LABELS) {

                                // check if this text (so label) is already present in the map

                                if (placedLabels.contains(texts))

                                        // the label has already placed before

                                        return false;

                                /*

                                 *  the text is not present, it will be registered for next to

                                 *  be avoided

                                 */

                                ((TreeSet<String[]>) placedLabels).add(texts);

                        }

                        lc.setTexts(texts);

                } catch (ExpressionException e) {

                        e.printStackTrace();

                        return false;

                }

                lc.toCartographicSize(viewPort, dpi, null);

                return true;

        }

        private Hashtable<String, Value> symbol_table = new Hashtable<String, Value>();

        private Hashtable<String, Expression> evaluators = new Hashtable<String, Expression>();

        private Expression getEvaluator(String strExpr) {

                Expression expr = evaluators.get(strExpr);

                if (expr == null) {

                        LabelExpressionParser p = new LabelExpressionParser(

                                        new StringReader(strExpr),symbol_table);

                        try {

                                p.LabelExpression();

                        } catch (ParseException e) {

                                e.printStackTrace();

                        }

                        expr = (Expression) p.getStack().pop();

                        evaluators.put(strExpr, expr);

                }

                return expr;

        }

        private boolean isOverlapping(BufferedImage bi, FShape labelShape) {

                Rectangle2D rPixels = labelShape.getBounds2D();

                for (int i= (int) rPixels.getX(); i<rPixels.getMaxX(); i++){

                        for (int j= (int) rPixels.getY(); j<rPixels.getMaxY(); j++){

                                if (!labelShape.contains(i, j)) {

                                        continue;

                                }

                                if (i<0 || j<0) {

                                        continue;

                                }

                                if (bi.getWidth()<i+1 || bi.getHeight()<j+1) {

                                        continue;

                                }

                                if (bi.getRGB(i,j)!=0){

                                        return true;

                                }

                        }

                }

                return false;

        }

        private boolean isOnePoint(ViewPort viewPort, IGeometry geom) {

                boolean onePoint = false;

                int shapeType = geom.getGeometryType();

                if (shapeType!=FShape.POINT && shapeType!=FShape.MULTIPOINT) {

                        Rectangle2D geomBounds = geom.getBounds2D();

                        ICoordTrans ct = layer.getCoordTrans();

                        if (ct!=null) {

                                geomBounds = ct.convert(geomBounds);

                        }

                        double dist1Pixel = viewPort.getDist1pixel();

                        onePoint = (geomBounds.getWidth() <= dist1Pixel

                                        && geomBounds.getHeight() <= dist1Pixel);

                }

                return onePoint;

        }

        public String getClassName() {

                return getClass().getName();

        }

        public XMLEntity getXMLEntity() {

                XMLEntity xml = new XMLEntity();

                xml.putProperty("labelingStrategy", "labelingStrategy");

                xml.putProperty("className", getClassName());

                xml.putProperty("allowsOverlapping", allowOverlapping);

//                xml.putProperty("minScaleView", minScaleView);

//                xml.putProperty("maxScaleView", maxScaleView);

                if (method!=null) {

                        XMLEntity methodEntity = method.getXMLEntity();

                        methodEntity.putProperty("id", "LabelingMethod");

                        xml.addChild(methodEntity);

                }

                if (placementConstraints != null) {

                        XMLEntity pcEntity = placementConstraints.getXMLEntity();

                        pcEntity.putProperty("id", "PlacementConstraints");

                        xml.addChild(pcEntity);

                }

                if (zoomConstraints != null) {

                        XMLEntity zcEntity = zoomConstraints.getXMLEntity();

                        zcEntity.putProperty("id", "ZoomConstraints");

                        xml.addChild(zcEntity);

                }

                return xml;

        }

        public void setXMLEntity(XMLEntity xml) {

                XMLEntity aux = xml.firstChild("id", "LabelingMethod");

                // overlapping mode

                if (xml.contains("allowsOverlapping")) {

                        allowOverlapping = xml.getBooleanProperty("allowsOverlapping");

                }

                if (aux != null) {

                        method = LabelingFactory.createMethodFromXML(aux);

                }

                aux = xml.firstChild("id", "PlacementConstraints");

                if (aux != null) {

                        placementConstraints = LabelingFactory.createPlacementConstraintsFromXML(aux);

                }

                aux = xml.firstChild("id", "ZoomConstraints");

                if (aux != null) {

                        zoomConstraints = LabelingFactory.createZoomConstraintsFromXML(aux);

                }

        }

        public boolean isAllowingOverlap() {

                return allowOverlapping;

        }

        public void setAllowOverlapping(boolean allowOverlapping) {

                this.allowOverlapping = allowOverlapping;

        }

        public IPlacementConstraints getPlacementConstraints() {

                if (placementConstraints != null)

                        return placementConstraints;

                try {

                        switch (layer.getShapeType()) {

                        case FShape.POINT:

                        case FShape.MULTIPOINT:

                                return DefaultPointPlacementConstraints;

                        case FShape.LINE:

                                return DefaultLinePlacementConstraints;

                        case FShape.POLYGON:

                                return DefaultPolygonPlacementConstraints;

                        case FShape.MULTI:

                                DefaultMultiShapePlacementConstratints.setPointConstraints(DefaultPointPlacementConstraints);

                                DefaultMultiShapePlacementConstratints.setLineConstraints(DefaultLinePlacementConstraints);

                                DefaultMultiShapePlacementConstratints.setPolygonConstraints(DefaultPolygonPlacementConstraints);

                                return DefaultMultiShapePlacementConstratints;

                        }

                } catch (ReadDriverException e) {

                }

                return null;

        }

        public void setPlacementConstraints(IPlacementConstraints constraints) {

                this.placementConstraints = constraints;

        }

        public IZoomConstraints getZoomConstraints() {

                return zoomConstraints;

        }

        public void setZoomConstraints(IZoomConstraints constraints) {

                this.zoomConstraints = constraints;

        }

        public void print(Graphics2D g, ViewPort viewPort, Cancellable cancel, PrintRequestAttributeSet properties) throws ReadDriverException {

                double dpi=100;

                draw(null,g,viewPort,cancel,dpi);

        }

        public String[] getUsedFields() {

                LabelClass[] lcs = method.getLabelClasses();

                ArrayList<String> fieldNames = new ArrayList<String>();

                for (int i = 0; i < lcs.length; i++) {

                        if(lcs[i].getLabelExpressions() != null){

                                for (int j = 0; j < lcs[i].getLabelExpressions().length; j++) {

                                        String expr = lcs[i].getLabelExpressions()[j];

                                        int start;

                                        while (expr != null &&

                                                        (start = expr.indexOf("[")) != -1) {

                                                int end = expr.indexOf("]");

                                                String field = expr.substring(start+1, end).trim();

                                                if (!fieldNames.contains(field))

                                                        fieldNames.add(field);

                                                expr = expr.substring(end+1, expr.length());

                                        }

                                }

                        }

                }

                return fieldNames.toArray(new String[fieldNames.size()]);

        }

        public boolean shouldDrawLabels(double scale) {

                double minScaleView = -1;

                double maxScaleView = -1;

                if (zoomConstraints != null) {

                        minScaleView = zoomConstraints.getMinScale();

                        maxScaleView = zoomConstraints.getMaxScale();

                }

                if (minScaleView == -1 && maxScaleView == -1) {

                        // parameters not set, so the layer decides.

                        return layer.isWithinScale(scale);

                }

                if (minScaleView <= scale) {

                        return (maxScaleView != -1) ? maxScaleView >= scale : true;

                }

                return false;

        }

        public void setUnit(int unitIndex) {

                unit = unitIndex;

        }

        public int getUnit() {

                return unit;

        }

        public int getReferenceSystem() {

                return referenceSystem;

        }

        public void setReferenceSystem(int referenceSystem) {

                this.referenceSystem = referenceSystem;

        }

        public double toCartographicSize(ViewPort viewPort, double dpi, FShape shp) {

                // TODO Auto-generated method stub

                return 0;

        }

        public void setCartographicSize(double cartographicSize, FShape shp) {

                // TODO Auto-generated method stub

        }

        public double getCartographicSize(ViewPort viewPort, double dpi, FShape shp) {

                // TODO Auto-generated method stub

                return 0;

        }

}