| LiteShape2.java |
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2004-2008, 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.geometry.jts;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
/**
* A thin wrapper that adapts a JTS geometry to the Shape interface so that the
* geometry can be used by java2d without coordinate cloning.
* <p>
* This implementation supports the use of MathTransform and can be constructed
* with a Decimation stratagy object (allowing you to fine tune the process by
* which a Geometry is simplified into a Shape).
* </p>
* <p>
* This implementation is very careful about cloning; and has the ability to
* go faster when you are using a LiteCoordinateSequenceFactory behind your
* geometry classes.
* </p>
* @author Jesse Eichar
* @source $URL: http://svn.osgeo.org/geotools/tags/2.7-M3/modules/library/main/src/main/java/org/geotools/geometry/jts/LiteShape2.java $
* @version $Id: LiteShape2.java 35164 2010-04-05 09:54:30Z aaime $
*/
public final class LiteShape2 implements Shape, Cloneable {
/** The wrapped JTS geometry */
private Geometry geometry;
private boolean generalize = false;
private double maxDistance = 1;
private static GeometryFactory geomFac;
/** transform from dataspace to screenspace */
private MathTransform mathTransform;
/**
* Creates a new LiteShape object.
*
* @param geom -
* the wrapped geometry
* @param mathTransform -
* the transformation applied to the geometry in order to get to
* the shape points
* @param decimator -
*
* @param generalize -
* set to true if the geometry need to be generalized during
* rendering
* @param maxDistance -
* distance used in the generalization process
* @throws TransformException
* @throws FactoryException
*/
public LiteShape2(Geometry geom, MathTransform mathTransform,
Decimator decimator, boolean generalize, double maxDistance)
throws TransformException, FactoryException {
this(geom, mathTransform, decimator, generalize);
this.maxDistance = maxDistance;
}
/**
* Creates a new LiteShape object.
*
* @param geom -
* the wrapped geometry
* @param mathTransform -
* the transformation applied to the geometry in order to get to
* the shape points
* @param decimator -
*
* @param generalize -
* set to true if the geometry need to be generalized during
* rendering
*
* @throws TransformException
* @throws FactoryException
*/
public LiteShape2(Geometry geom, MathTransform mathTransform,
Decimator decimator, boolean generalize) throws TransformException,
FactoryException {
this(geom, mathTransform, decimator, generalize, true);
}
/**
* Creates a new LiteShape object.
*
* @param geom -
* the wrapped geometry
* @param mathTransform -
* the transformation applied to the geometry in order to get to
* the shape points
* @param decimator -
*
* @param generalize -
* set to true if the geometry need to be generalized during
* rendering
*
* @param clone - if clone is false the original geometry may be modified directly, if true it will be
* cloned to make sure the original remains untouched
*
* @throws TransformException
* @throws FactoryException
*/
public LiteShape2(Geometry geom, MathTransform mathTransform,
Decimator decimator, boolean generalize, boolean clone) throws TransformException,
FactoryException {
if (geom != null) {
if(!clone && geom.getFactory().getCoordinateSequenceFactory() instanceof LiteCoordinateSequenceFactory)
this.geometry = geom;
else
this.geometry = LiteCoordinateSequence.cloneGeometry(geom);
}
this.mathTransform = mathTransform;
if (decimator != null) {
decimator.decimateTransformGeneralize(this.geometry,this.mathTransform);
this.geometry.geometryChanged();
} else {
// if we have a transform a decimation span can be detected, so try to decimate anyways
if (mathTransform != null && !mathTransform.isIdentity() && generalize)
new Decimator(mathTransform.inverse()).decimate(this.geometry);
this.geometry.geometryChanged();
if (geometry != null) {
transformGeometry(geometry);
this.geometry.geometryChanged();
}
}
this.generalize = false;
}
private void transformGeometry(Geometry geometry)
throws TransformException, FactoryException {
if (mathTransform == null || mathTransform.isIdentity())
return;
if (geometry instanceof GeometryCollection) {
GeometryCollection collection = (GeometryCollection) geometry;
for (int i = 0; i < collection.getNumGeometries(); i++) {
transformGeometry(collection.getGeometryN(i));
}
} else if (geometry instanceof Point) {
LiteCoordinateSequence seq = (LiteCoordinateSequence) ((Point) geometry)
.getCoordinateSequence();
double[] coords = seq.getArray();
double[] newCoords = new double[coords.length];
mathTransform.transform(coords, 0, newCoords, 0, seq.size());
seq.setArray(newCoords);
} else if (geometry instanceof Polygon) {
Polygon polygon = (Polygon) geometry;
transformGeometry(polygon.getExteriorRing());
for (int i = 0; i < polygon.getNumInteriorRing(); i++) {
transformGeometry(polygon.getInteriorRingN(i));
}
} else if (geometry instanceof LineString) {
LiteCoordinateSequence seq = (LiteCoordinateSequence) ((LineString) geometry)
.getCoordinateSequence();
double[] coords = seq.getArray();
mathTransform.transform(coords, 0, coords, 0, seq.size());
seq.setArray(coords);
}
}
private GeometryFactory getGeometryFactory() {
if (geomFac == null) {
geomFac = new GeometryFactory(new LiteCoordinateSequenceFactory());
}
return geomFac;
}
/**
* Sets the geometry contained in this lite shape. Convenient to reuse this
* object instead of creating it again and again during rendering
*
* @param g
* @throws TransformException
* @throws FactoryException
*/
public void setGeometry(Geometry g) throws TransformException,
FactoryException {
if (g != null) {
this.geometry = getGeometryFactory().createGeometry(g);
transformGeometry(geometry);
}
}
/**
* Tests if the interior of the <code>Shape</code> entirely contains the
* specified <code>Rectangle2D</code>. This method might conservatively
* return <code>false</code> when:
*
* <ul>
* <li>the <code>intersect</code> method returns <code>true</code> and
* </li>
* <li>the calculations to determine whether or not the <code>Shape</code>
* entirely contains the <code>Rectangle2D</code> are prohibitively
* expensive.</li>
* </ul>
*
* This means that this method might return <code>false</code> even though
* the <code>Shape</code> contains the <code>Rectangle2D</code>. The
* <code>Area</code> class can be used to perform more accurate
* computations of geometric intersection for any <code>Shape</code>
* object if a more precise answer is required.
*
* @param r
* The specified <code>Rectangle2D</code>
*
* @return <code>true</code> if the interior of the <code>Shape</code>
* entirely contains the <code>Rectangle2D</code>;
* <code>false</code> otherwise or, if the <code>Shape</code>
* contains the <code>Rectangle2D</code> and the
* <code>intersects</code> method returns <code>true</code> and
* the containment calculations would be too expensive to perform.
*
* @see #contains(double, double, double, double)
*/
public boolean contains(Rectangle2D r) {
Geometry rect = rectangleToGeometry(r);
return geometry.contains(rect);
}
/**
* Tests if a specified {@link Point2D}is inside the boundary of the
* <code>Shape</code>.
*
* @param p
* a specified <code>Point2D</code>
*
* @return <code>true</code> if the specified <code>Point2D</code> is
* inside the boundary of the <code>Shape</code>;
* <code>false</code> otherwise.
*/
public boolean contains(Point2D p) {
Coordinate coord = new Coordinate(p.getX(), p.getY());
Geometry point = geometry.getFactory().createPoint(coord);
return geometry.contains(point);
}
/**
* Tests if the specified coordinates are inside the boundary of the
* <code>Shape</code>.
*
* @param x
* the specified coordinates, x value
* @param y
* the specified coordinates, y value
*
* @return <code>true</code> if the specified coordinates are inside the
* <code>Shape</code> boundary; <code>false</code> otherwise.
*/
public boolean contains(double x, double y) {
Coordinate coord = new Coordinate(x, y);
Geometry point = geometry.getFactory().createPoint(coord);
return geometry.contains(point);
}
/**
* Tests if the interior of the <code>Shape</code> entirely contains the
* specified rectangular area. All coordinates that lie inside the
* rectangular area must lie within the <code>Shape</code> for the entire
* rectanglar area to be considered contained within the <code>Shape</code>.
*
* <p>
* This method might conservatively return <code>false</code> when:
*
* <ul>
* <li>the <code>intersect</code> method returns <code>true</code> and
* </li>
* <li>the calculations to determine whether or not the <code>Shape</code>
* entirely contains the rectangular area are prohibitively expensive.</li>
* </ul>
*
* This means that this method might return <code>false</code> even though
* the <code>Shape</code> contains the rectangular area. The
* <code>Area</code> class can be used to perform more accurate
* computations of geometric intersection for any <code>Shape</code>
* object if a more precise answer is required.
* </p>
*
* @param x
* the coordinates of the specified rectangular area, x value
* @param y
* the coordinates of the specified rectangular area, y value
* @param w
* the width of the specified rectangular area
* @param h
* the height of the specified rectangular area
*
* @return <code>true</code> if the interior of the <code>Shape</code>
* entirely contains the specified rectangular area;
* <code>false</code> otherwise or, if the <code>Shape</code>
* contains the rectangular area and the <code>intersects</code>
* method returns <code>true</code> and the containment
* calculations would be too expensive to perform.
*
* @see java.awt.geom.Area
* @see #intersects
*/
public boolean contains(double x, double y, double w, double h) {
Geometry rect = createRectangle(x, y, w, h);
return geometry.contains(rect);
}
/**
* Returns an integer {@link Rectangle}that completely encloses the
* <code>Shape</code>. Note that there is no guarantee that the returned
* <code>Rectangle</code> is the smallest bounding box that encloses the
* <code>Shape</code>, only that the <code>Shape</code> lies entirely
* within the indicated <code>Rectangle</code>. The returned
* <code>Rectangle</code> might also fail to completely enclose the
* <code>Shape</code> if the <code>Shape</code> overflows the limited
* range of the integer data type. The <code>getBounds2D</code> method
* generally returns a tighter bounding box due to its greater flexibility
* in representation.
*
* @return an integer <code>Rectangle</code> that completely encloses the
* <code>Shape</code>.
*
* @see #getBounds2D
*/
public Rectangle getBounds() {
Rectangle2D env = getBounds2D();
return new Rectangle((int) Math.round(env.getMinX()),
(int) Math.round(env.getMinY()),
(int) Math.ceil(env.getWidth()),
(int) Math.ceil(env.getHeight()));
}
/**
* Returns a high precision and more accurate bounding box of the
* <code>Shape</code> than the <code>getBounds</code> method. Note that
* there is no guarantee that the returned {@link Rectangle2D}is the
* smallest bounding box that encloses the <code>Shape</code>, only that
* the <code>Shape</code> lies entirely within the indicated
* <code>Rectangle2D</code>. The bounding box returned by this method is
* usually tighter than that returned by the <code>getBounds</code> method
* and never fails due to overflow problems since the return value can be an
* instance of the <code>Rectangle2D</code> that uses double precision
* values to store the dimensions.
*
* @return an instance of <code>Rectangle2D</code> that is a
* high-precision bounding box of the <code>Shape</code>.
*
* @see #getBounds
*/
public Rectangle2D getBounds2D() {
Envelope env = geometry.getEnvelopeInternal();
// note, we dont' use getWidth/getHeight since they are slower
return new Rectangle2D.Double(env.getMinX(), env.getMinY(), env.getMaxX() - env.getMinX(),
env.getMaxY() - env.getMinY());
}
/**
* Returns an iterator object that iterates along the <code>Shape</code>
* boundary and provides access to the geometry of the <code>Shape</code>
* outline. If an optional {@link AffineTransform}is specified, the
* coordinates returned in the iteration are transformed accordingly.
*
* <p>
* Each call to this method returns a fresh <code>PathIterator</code>
* object that traverses the geometry of the <code>Shape</code> object
* independently from any other <code>PathIterator</code> objects in use
* at the same time.
* </p>
*
* <p>
* It is recommended, but not guaranteed, that objects implementing the
* <code>Shape</code> interface isolate iterations that are in process
* from any changes that might occur to the original object's geometry
* during such iterations.
* </p>
*
* <p>
* Before using a particular implementation of the <code>Shape</code>
* interface in more than one thread simultaneously, refer to its
* documentation to verify that it guarantees that iterations are isolated
* from modifications.
* </p>
*
* @param at
* an optional <code>AffineTransform</code> to be applied to
* the coordinates as they are returned in the iteration, or
* <code>null</code> if untransformed coordinates are desired
*
* @return a new <code>PathIterator</code> object, which independently
* traverses the geometry of the <code>Shape</code>.
*/
public PathIterator getPathIterator(AffineTransform at) {
PathIterator pi = null;
if(this.geometry == null || this.geometry.isEmpty())
return EmptyIterator.INSTANCE;
// return iterator according to the kind of geometry we include
if (this.geometry instanceof Point) {
pi = new PointIterator((Point) geometry, at);
}
if (this.geometry instanceof Polygon) {
pi = new PolygonIterator((Polygon) geometry, at, generalize, maxDistance);
} else if (this.geometry instanceof LineString) {
pi = new LineIterator((LineString) geometry, at, generalize, (float) maxDistance);
} else if (this.geometry instanceof GeometryCollection) {
pi = new GeomCollectionIterator((GeometryCollection) geometry, at, generalize, maxDistance);
}
return pi;
}
/**
* Returns an iterator object that iterates along the <code>Shape</code>
* boundary and provides access to a flattened view of the
* <code>Shape</code> outline geometry.
*
* <p>
* Only SEG_MOVETO, SEG_LINETO, and SEG_CLOSE point types are returned by
* the iterator.
* </p>
*
* <p>
* If an optional <code>AffineTransform</code> is specified, the
* coordinates returned in the iteration are transformed accordingly.
* </p>
*
* <p>
* The amount of subdivision of the curved segments is controlled by the
* <code>flatness</code> parameter, which specifies the maximum distance
* that any point on the unflattened transformed curve can deviate from the
* returned flattened path segments. Note that a limit on the accuracy of
* the flattened path might be silently imposed, causing very small
* flattening parameters to be treated as larger values. This limit, if
* there is one, is defined by the particular implementation that is used.
* </p>
*
* <p>
* Each call to this method returns a fresh <code>PathIterator</code>
* object that traverses the <code>Shape</code> object geometry
* independently from any other <code>PathIterator</code> objects in use
* at the same time.
* </p>
*
* <p>
* It is recommended, but not guaranteed, that objects implementing the
* <code>Shape</code> interface isolate iterations that are in process
* from any changes that might occur to the original object's geometry
* during such iterations.
* </p>
*
* <p>
* Before using a particular implementation of this interface in more than
* one thread simultaneously, refer to its documentation to verify that it
* guarantees that iterations are isolated from modifications.
* </p>
*
* @param at
* an optional <code>AffineTransform</code> to be applied to
* the coordinates as they are returned in the iteration, or
* <code>null</code> if untransformed coordinates are desired
* @param flatness
* the maximum distance that the line segments used to
* approximate the curved segments are allowed to deviate from
* any point on the original curve
*
* @return a new <code>PathIterator</code> that independently traverses
* the <code>Shape</code> geometry.
*/
public PathIterator getPathIterator(AffineTransform at, double flatness) {
return getPathIterator(at);
}
/**
* Tests if the interior of the <code>Shape</code> intersects the interior
* of a specified <code>Rectangle2D</code>. This method might
* conservatively return <code>true</code> when:
*
* <ul>
* <li>there is a high probability that the <code>Rectangle2D</code> and
* the <code>Shape</code> intersect, but</li>
* <li>the calculations to accurately determine this intersection are
* prohibitively expensive.</li>
* </ul>
*
* This means that this method might return <code>true</code> even though
* the <code>Rectangle2D</code> does not intersect the <code>Shape</code>.
*
* @param r
* the specified <code>Rectangle2D</code>
*
* @return <code>true</code> if the interior of the <code>Shape</code>
* and the interior of the specified <code>Rectangle2D</code>
* intersect, or are both highly likely to intersect and
* intersection calculations would be too expensive to perform;
* <code>false</code> otherwise.
*
* @see #intersects(double, double, double, double)
*/
public boolean intersects(Rectangle2D r) {
Geometry rect = rectangleToGeometry(r);
return geometry.intersects(rect);
}
/**
* Tests if the interior of the <code>Shape</code> intersects the interior
* of a specified rectangular area. The rectangular area is considered to
* intersect the <code>Shape</code> if any point is contained in both the
* interior of the <code>Shape</code> and the specified rectangular area.
*
* <p>
* This method might conservatively return <code>true</code> when:
*
* <ul>
* <li>there is a high probability that the rectangular area and the
* <code>Shape</code> intersect, but</li>
* <li>the calculations to accurately determine this intersection are
* prohibitively expensive.</li>
* </ul>
*
* This means that this method might return <code>true</code> even though
* the rectangular area does not intersect the <code>Shape</code>. The
* {@link java.awt.geom.Area Area}class can be used to perform more
* accurate computations of geometric intersection for any
* <code>Shape</code> object if a more precise answer is required.
* </p>
*
* @param x
* the coordinates of the specified rectangular area, x value
* @param y
* the coordinates of the specified rectangular area, y value
* @param w
* the width of the specified rectangular area
* @param h
* the height of the specified rectangular area
*
* @return <code>true</code> if the interior of the <code>Shape</code>
* and the interior of the rectangular area intersect, or are both
* highly likely to intersect and intersection calculations would be
* too expensive to perform; <code>false</code> otherwise.
*
* @see java.awt.geom.Area
*/
public boolean intersects(double x, double y, double w, double h) {
Geometry rect = createRectangle(x, y, w, h);
return geometry.intersects(rect);
}
/**
* Converts the Rectangle2D passed as parameter in a jts Geometry object
*
* @param r
* the rectangle to be converted
*
* @return a geometry with the same vertices as the rectangle
*/
private Geometry rectangleToGeometry(Rectangle2D r) {
return createRectangle(r.getMinX(), r.getMinY(), r.getWidth(), r
.getHeight());
}
/**
* Creates a jts Geometry object representing a rectangle with the given
* parameters
*
* @param x
* left coordinate
* @param y
* bottom coordinate
* @param w
* width
* @param h
* height
*
* @return a rectangle with the specified position and size
*/
private Geometry createRectangle(double x, double y, double w, double h) {
Coordinate[] coords = { new Coordinate(x, y), new Coordinate(x, y + h),
new Coordinate(x + w, y + h), new Coordinate(x + w, y),
new Coordinate(x, y) };
LinearRing lr = geometry.getFactory().createLinearRing(coords);
return geometry.getFactory().createPolygon(lr, null);
}
public MathTransform getMathTransform() {
return mathTransform;
}
public Geometry getGeometry() {
return geometry;
}
}