/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, 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.renderer.shape;
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Canvas;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.TexturePaint;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Icon;
import org.geotools.geometry.jts.Decimator;
import org.geotools.geometry.jts.GeomCollectionIterator;
import org.geotools.geometry.jts.LiteShape2;
import org.geotools.referencing.operation.transform.AffineTransform2D;
import org.geotools.renderer.lite.LabelCache;
import org.geotools.renderer.style.GraphicStyle2D;
import org.geotools.renderer.style.IconStyle2D;
import org.geotools.renderer.style.LineStyle2D;
import org.geotools.renderer.style.MarkStyle2D;
import org.geotools.renderer.style.PolygonStyle2D;
import org.geotools.renderer.style.Style2D;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.operation.TransformException;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
* A simple class that knows how to paint a Shape object onto a Graphic given a
* Style2D. It's the last step of the rendering engine, and has been factored
* out since both renderers do use the same painting logic.
*
* @author Andrea Aime
* @source $URL$
*/
public class StyledShapePainter {
private static AffineTransform IDENTITY_TRANSFORM = new AffineTransform();
/** Observer for image loading */
private static Canvas imgObserver = new Canvas();
/** The logger for the rendering module. */
private static final Logger LOGGER = org.geotools.util.logging.Logging.getLogger(StyledShapePainter.class
.getName());
LabelCache labelCache;
/**
* Construct <code>StyledShapePainter</code>.
*
* @param labelCache DOCUMENT ME!
*/
public StyledShapePainter(LabelCache labelCache) {
this.labelCache = labelCache;
}
/**
* Invoked automatically when a polyline is about to be draw. This
* implementation paints the polyline according to the rendered style
*
* @param graphics The graphics in which to draw.
* @param shape The polygon to draw.
* @param style The style to apply, or <code>null</code> if none.
* @param scale The scale denominator for the current zoom level
*/
public void paint(final Graphics2D graphics, final Shape shape,
final Style2D style, final double scale) throws FactoryException, TransformException {
if (style == null) {
// TODO: what's going on? Should not be reached...
LOGGER.severe("ShapePainter has been asked to paint a null style!!");
return;
}
// Is the current scale within the style scale range?
if (!style.isScaleInRange(scale)) {
LOGGER.fine("Out of scale");
return;
}
if(style instanceof IconStyle2D) {
AffineTransform temp = graphics.getTransform();
try {
IconStyle2D icoStyle = (IconStyle2D) style;
Icon icon = icoStyle.getIcon();
graphics.setComposite(icoStyle.getComposite());
// the displacement to be applied to all points, centers the icon and applies the
// Graphic displacement as well
float dx = - (float) (icon.getIconWidth() / 2.0 + icoStyle.getDisplacementX());
float dy = - (float) (icon.getIconHeight() / 2.0 + icoStyle.getDisplacementY());
// iterate over all points
float[] coords = new float[2];
PathIterator citer = shape.getPathIterator(IDENTITY_TRANSFORM);
AffineTransform markAT = new AffineTransform(temp);
while (!(citer.isDone())) {
citer.currentSegment(coords);
markAT.setTransform(temp);
markAT.translate(coords[0] + dx , coords[1] + dy);
markAT.rotate(icoStyle.getRotation());
graphics.setTransform(markAT);
icon.paintIcon(null, graphics, 0, 0);
citer.next();
}
} finally {
graphics.setTransform(temp);
}
} else if (style instanceof MarkStyle2D) {
PathIterator citer = shape.getPathIterator(IDENTITY_TRANSFORM);
// get the point onto the shape has to be painted
float[] coords = new float[2];
MarkStyle2D ms2d = (MarkStyle2D) style;
while (!(citer.isDone())) {
citer.currentSegment(coords);
Shape transformedShape = ms2d.getTransformedShape(coords[0],
coords[1]);
if (transformedShape != null) {
if (ms2d.getFill() != null) {
graphics.setPaint(ms2d.getFill());
graphics.setComposite(ms2d.getFillComposite());
graphics.fill(transformedShape);
}
if (ms2d.getContour() != null) {
graphics.setPaint(ms2d.getContour());
graphics.setStroke(ms2d.getStroke());
graphics.setComposite(ms2d.getContourComposite());
graphics.draw(transformedShape);
}
citer.next();
}
}
} else if (style instanceof GraphicStyle2D) {
float[] coords = new float[2];
PathIterator iter = shape.getPathIterator(IDENTITY_TRANSFORM);
iter.currentSegment(coords);
GraphicStyle2D gs2d = (GraphicStyle2D) style;
while (!(iter.isDone())) {
iter.currentSegment(coords);
renderImage(graphics, coords[0], coords[1],
(Image) gs2d.getImage(), gs2d.getRotation(), gs2d
.getOpacity(), false);
iter.next();
}
} else {
// if the style is a polygon one, process it even if the polyline is not
// closed (by SLD specification)
if (style instanceof PolygonStyle2D) {
PolygonStyle2D ps2d = (PolygonStyle2D) style;
if (ps2d.getFill() != null) {
Paint paint = ps2d.getFill();
if (paint instanceof TexturePaint) {
TexturePaint tp = (TexturePaint) paint;
BufferedImage image = tp.getImage();
Rectangle2D rect = tp.getAnchorRect();
AffineTransform at = graphics.getTransform();
double width = rect.getWidth() * at.getScaleX();
double height = rect.getHeight() * at.getScaleY();
Rectangle2D scaledRect = new Rectangle2D.Double(0, 0,
width, height);
paint = new TexturePaint(image, scaledRect);
}
graphics.setPaint(paint);
graphics.setComposite(ps2d.getFillComposite());
graphics.fill(shape);
}
if (ps2d.getGraphicFill() != null) {
paintGraphicFill(graphics, shape, ps2d.getGraphicFill(), scale);
}
}
if (style instanceof LineStyle2D) {
LineStyle2D ls2d = (LineStyle2D) style;
if (ls2d.getStroke() != null) {
// see if a graphic stroke is to be used, the drawing method is completely
// different in this case
if (ls2d.getGraphicStroke() != null) {
drawWithGraphicsStroke(graphics, shape,
ls2d.getGraphicStroke());
} else {
Paint paint = ls2d.getContour();
if (paint instanceof TexturePaint) {
TexturePaint tp = (TexturePaint) paint;
BufferedImage image = tp.getImage();
Rectangle2D rect = tp.getAnchorRect();
AffineTransform at = graphics.getTransform();
double width = rect.getWidth() * at.getScaleX();
double height = rect.getHeight() * at.getScaleY();
Rectangle2D scaledRect = new Rectangle2D.Double(0,
0, width, height);
paint = new TexturePaint(image, scaledRect);
}
// debugShape(shape);
Stroke stroke = ls2d.getStroke();
if (graphics.getRenderingHint(
RenderingHints.KEY_ANTIALIASING) == RenderingHints.VALUE_ANTIALIAS_ON) {
if (stroke instanceof BasicStroke) {
BasicStroke bs = (BasicStroke) stroke;
stroke = new BasicStroke(bs.getLineWidth()
+ 0.5f, bs.getEndCap(),
bs.getLineJoin(), bs.getMiterLimit(),
bs.getDashArray(), bs.getDashPhase());
}
}
graphics.setPaint(paint);
graphics.setStroke(stroke);
graphics.setComposite(ls2d.getContourComposite());
graphics.draw(shape);
}
}
}
}
}
/**
* Extracts a ath iterator from the shape
* @param shape
* @return
*/
private GeomCollectionIterator getPathIterator(final LiteShape2 shape) {
// DJB: changed this to handle multi* geometries and line and
// polygon geometries better
GeometryCollection gc;
if (shape.getGeometry() instanceof GeometryCollection)
gc = (GeometryCollection) shape.getGeometry();
else {
Geometry[] gs = new Geometry[1];
gs[0] = shape.getGeometry();
gc = shape.getGeometry().getFactory().createGeometryCollection(
gs); // make a Point,Line, or Poly into a GC
}
GeomCollectionIterator citer = new GeomCollectionIterator(gc,
IDENTITY_TRANSFORM, false, 1.0);
return citer;
}
// draws the image along the path
private void drawWithGraphicsStroke(Graphics2D graphics, Shape shape,
BufferedImage image) {
PathIterator pi = shape.getPathIterator(null, 10.0);
double[] coords = new double[4];
int type;
// I suppose the image has been already scaled and its square
int imageSize = image.getWidth();
double[] first = new double[2];
double[] previous = new double[2];
type = pi.currentSegment(coords);
first[0] = coords[0];
first[1] = coords[1];
previous[0] = coords[0];
previous[1] = coords[1];
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("starting at " + first[0] + "," + first[1]);
}
pi.next();
while (!pi.isDone()) {
type = pi.currentSegment(coords);
switch (type) {
case PathIterator.SEG_MOVETO:
// nothing to do?
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("moving to " + coords[0] + "," + coords[1]);
}
break;
case PathIterator.SEG_CLOSE:
// draw back to first from previous
coords[0] = first[0];
coords[1] = first[1];
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("closing from " + previous[0] + ","
+ previous[1] + " to " + coords[0] + "," + coords[1]);
}
// no break here - fall through to next section
case PathIterator.SEG_LINETO:
// draw from previous to coords
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("drawing from " + previous[0] + ","
+ previous[1] + " to " + coords[0] + "," + coords[1]);
}
double dx = coords[0] - previous[0];
double dy = coords[1] - previous[1];
double len = Math.sqrt((dx * dx) + (dy * dy)); // - imageWidth;
double theta = Math.atan2(dx, dy);
dx = (Math.sin(theta) * imageSize);
dy = (Math.cos(theta) * imageSize);
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("dx = " + dx + " dy " + dy + " step = "
+ Math.sqrt((dx * dx) + (dy * dy)));
}
double rotation = -(theta - (Math.PI / 2d));
double x = previous[0];
double y = previous[1];
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("len =" + len + " imageSize " + imageSize);
}
double dist = 0;
for (dist = 0; dist < (len - imageSize); dist += imageSize) {
renderImage(graphics, x, y, image, rotation, 1, true);
// Use this code to visually debug the x,y used to draw the image
// graphics.setColor(Color.BLACK);
// graphics.setStroke(new BasicStroke());
// graphics.draw(new Line2D.Double(x, y, x, y));
x += dx;
y += dy;
}
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("loop end dist " + dist + " len " + len + " "
+ (len - dist));
}
double remainder = len - dist;
int remainingWidth = (int) Math.round(remainder);
if (remainingWidth > 0) {
//clip and render image
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("about to use clipped image " + remainder);
}
// the +2 is a magic number. That is, I don't know exactly
// where it comes from, but closing images always seem to be missing
// two pixels...
BufferedImage img = new BufferedImage(remainingWidth + 2,
image.getHeight(), image.getType());
Graphics2D ig = img.createGraphics();
ig.drawImage(image, 0, 0, imgObserver);
renderImage(graphics, x, y, img, rotation, 1, true);
}
break;
default:
LOGGER.warning(
"default branch reached in drawWithGraphicStroke");
}
previous[0] = coords[0];
previous[1] = coords[1];
pi.next();
}
}
/**
* Renders an image on the device
*
* @param graphics
* the image location on the screen, x coordinate
* @param x
* the image location on the screen, y coordinate
* @param y
* the image
* @param image
* DOCUMENT ME!
* @param rotation
* the image rotatation
* @param opacity
* DOCUMENT ME!
*/
private void renderImage(Graphics2D graphics, double x, double y,
Image image, double rotation, float opacity, boolean leftMiddle) {
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("drawing Image @" + x + "," + y);
}
AffineTransform temp = graphics.getTransform();
AffineTransform markAT = new AffineTransform();
Point2D center = new java.awt.geom.Point2D.Double(x, y);
Point2D pointTx = new java.awt.geom.Point2D.Double();
temp.transform(center, pointTx);
markAT.translate(pointTx.getX(), pointTx.getY());
double shearY = temp.getShearY();
double scaleY = temp.getScaleY();
double originalRotation = Math.atan(shearY / scaleY);
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("originalRotation " + originalRotation);
}
markAT.rotate(rotation);
graphics.setTransform(markAT);
graphics.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, opacity));
// we moved the origin to the middle of the image.
if(leftMiddle) {
graphics.drawImage(image, 0, -image
.getHeight(imgObserver) / 2, imgObserver);
} else {
graphics.drawImage(image, -image.getWidth(imgObserver) / 2, -image
.getHeight(imgObserver) / 2, imgObserver);
}
graphics.setTransform(temp);
return;
}
/**
* Paints a graphic fill for a given shape.
*
* @param graphics Graphics2D on which to paint.
* @param shape Shape whose fill is to be painted.
* @param graphicFill a Style2D that specified the graphic fill.
* @param scale the scale of the current render.
* @throws TransformException
* @throws FactoryException
*/
private void paintGraphicFill(Graphics2D graphics, Shape shape, Style2D graphicFill, double scale) throws TransformException, FactoryException
{
// retrieves the bounds of the provided shape
Rectangle2D boundsShape = shape.getBounds2D();
// retrieves the size of the stipple to be painted based on the provided graphic fill
Rectangle2D stippleSize = null;
if (graphicFill instanceof MarkStyle2D)
{
Rectangle2D boundsFill = ((MarkStyle2D)graphicFill).getShape().getBounds2D();
double size = ((MarkStyle2D)graphicFill).getSize();
double aspect = (boundsFill.getHeight() > 0 && boundsFill.getWidth() > 0) ? boundsFill.getWidth()/boundsFill.getHeight() : 1.0;
stippleSize = new Rectangle2D.Double(0, 0, size*aspect, size);
} else if(graphicFill instanceof IconStyle2D) {
Icon icon = ((IconStyle2D)graphicFill).getIcon();
stippleSize = new Rectangle2D.Double(0, 0, icon.getIconWidth(), icon.getIconHeight());
} else {
// if graphic fill does not provide bounds information, it is considered
// to be unsupported for stipple painting
return;
}
// computes the number of times the graphic will be painted as a stipple
int nStippleX = (int) Math.ceil(boundsShape.getWidth() / stippleSize.getWidth());
int nStippleY = (int) Math.ceil(boundsShape.getHeight() / stippleSize.getHeight());
// creates a copy of the Graphics so that we can change it freely
Graphics2D g = (Graphics2D)graphics.create();
// adds the provided shape to the Graphics current clip region
g.clip(shape);
// retrieves the full clip region
Shape clipShape = g.getClip();
// paints graphic fill as a stipple
for (int i = 0; i < nStippleX; i++)
{
for (int j = 0; j < nStippleY; j++)
{
// computes this stipple's shift in the X and Y directions
double translateX = boundsShape.getMinX() + i * stippleSize.getWidth();
double translateY = boundsShape.getMinY() + j * stippleSize.getHeight();
// only does anything if current stipple intersects the clip region
if (!clipShape.intersects(translateX, translateY, stippleSize.getWidth(), stippleSize.getHeight()))
continue;
// creates a LiteShape2 for the stipple and paints it
LiteShape2 stippleShape = createStippleShape(stippleSize, translateX, translateY);
paint(g, stippleShape, graphicFill, scale);
}
}
}
/**
* Creates a stipple shape given a stipple size and a shift in the x and y directions.
* The returned shape should be appropriate for painting a stipple using a GraphicFill.
*
* @param stippleSize a Rectangle whose width and height indicate the size of the stipple.
* @param translateX a translation value in the X dimension.
* @param translateY a translation value in the Y dimension.
* @return a LiteShape2 appropriate for painting a stipple using a GraphicFill.
* @throws TransformException
* @throws FactoryException
*/
private LiteShape2 createStippleShape(Rectangle2D stippleSize, double translateX, double translateY) throws TransformException, FactoryException
{
// builds the JTS geometry for the translated stipple
GeometryFactory geomFactory = new GeometryFactory();
Coordinate coord = new Coordinate(stippleSize.getCenterX() + translateX, stippleSize.getCenterY() + translateY);
Geometry geom = geomFactory.createPoint(coord);
// builds a LiteShape2 object from the JTS geometry
AffineTransform2D identityTransf = new AffineTransform2D(new AffineTransform());
Decimator nullDecimator = new Decimator(-1, -1);
LiteShape2 stippleShape;
stippleShape = new LiteShape2(geom, identityTransf, nullDecimator, false);
return stippleShape;
}
}