/*
* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2012, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.tutorials.style.color;
import java.awt.Color;
import java.awt.Graphics2D;
import java.io.IOException;
import org.locationtech.udig.catalog.IGeoResource;
import org.locationtech.udig.project.ILayer;
import org.locationtech.udig.project.IStyleBlackboard;
import org.locationtech.udig.project.internal.render.impl.RendererImpl;
import org.locationtech.udig.project.render.RenderException;
import org.locationtech.udig.tutorials.catalog.csv.CSV;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.geotools.geometry.jts.JTS;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import au.com.bytecode.opencsv.CSVReader;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Point;
public class ColorCSVRenderer extends RendererImpl {
@Override
public void render( IProgressMonitor monitor ) throws RenderException {
Graphics2D g = getContext().getImage().createGraphics();
render(g, monitor);
}
/**
* This example shows how to obtain a color.
*
* @param g
* @param monitor
* @throws RenderException
*/
public void render( Graphics2D g, IProgressMonitor monitor ) throws RenderException {
if (monitor == null)
monitor = new NullProgressMonitor();
CSVReader reader = null;
try {
ILayer layer = getContext().getLayer();
IGeoResource resource = layer.findGeoResource(CSV.class);
if (resource == null)
return;
ReferencedEnvelope bounds = getRenderBounds();
monitor.subTask("connecting");
CSV csv = resource.resolve(CSV.class, null);
// LOOK UP STYLE
IStyleBlackboard style = layer.getStyleBlackboard();
Color color = (Color) style.get( ColorStyle.ID );
// DATA TO WORLD
CoordinateReferenceSystem dataCRS = layer.getCRS();
CoordinateReferenceSystem worldCRS = context.getCRS();
MathTransform dataToWorld = CRS.findMathTransform(dataCRS, worldCRS, false);
// DRAW FILE
monitor.beginTask("csv render", csv.getSize());
reader = csv.reader();
int nameIndex = csv.getHeader("name");
Coordinate worldLocation = new Coordinate();
String [] row;
while ((row = reader.readNext()) != null) {
Point point = csv.getPoint(row);
Coordinate dataLocation = point.getCoordinate();
try {
JTS.transform(dataLocation, worldLocation, dataToWorld);
} catch (TransformException e) {
continue;
}
if (bounds != null && !bounds.contains(worldLocation)) {
continue; // optimize!
}
java.awt.Point p = getContext().worldToPixel(worldLocation);
g.setColor( color );
g.fillRect(p.x-2, p.y-2, 6, 6);
g.setColor(Color.BLACK);
String name = row[nameIndex];
g.drawString(name, p.x + 15, p.y + 15);
monitor.worked(1);
if (monitor.isCanceled()) break;
}
} catch (IOException e) {
throw new RenderException(e); // rethrow any exceptions encountered
} catch (FactoryException e) {
throw new RenderException(e); // rethrow any exceptions encountered
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException e) {
throw new RenderException(e); // rethrow any exceptions encountered
}
monitor.done();
}
}
}