org.jgrasstools.gears.utils.images.ImageGenerator Maven / Gradle / Ivy
/*
* This file is part of JGrasstools (http://www.jgrasstools.org)
* (C) HydroloGIS - www.hydrologis.com
*
* JGrasstools 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 3 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, see A sample usage could be the overlay of vector layers.
*
* ImageGenerator imgGen = new ImageGenerator();
* imgGen.addFeaturePath(reticolo, null);
* imgGen.setLayers();
* imgGen.dumpPngImage(imagePath, bounds, 300, 300, 100);
* imgGen.dispose();
*
*
* @author Andrea Antonello (www.hydrologis.com)
* @since 0.7.3
*/
public class ImageGenerator {
private List featurePaths = new ArrayList();
private List featureFilter = new ArrayList();
private List coveragePaths = new ArrayList();
private AffineTransform worldToScreen;
// private AffineTransform screenToWorld;
private StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
private MapContent content;
private GTRenderer renderer;
private CoordinateReferenceSystem crs;
/**
* Add a new coverage file path.
*
* The order will be considered. First paths are drawn first.
*
* @param coveragePath the path to add.
*/
public void addCoveragePath( String coveragePath ) {
if (!coveragePaths.contains(coveragePath)) {
coveragePaths.add(coveragePath);
}
}
/**
* Add a new feature file path.
*
* The order will be considered. First paths are drawn first.
*
* @param featurePath the path to add.
*/
public void addFeaturePath( String featurePath, String filter ) {
if (!featurePaths.contains(featurePath)) {
featurePaths.add(featurePath);
if (filter == null) {
filter = "";
}
featureFilter.add(filter);
}
}
/**
* Set the layers that have to be drawn.
*
* This has to be called before the drawing process.
* @throws Exception
*/
public void setLayers() throws Exception {
content = new MapContent();
content.setTitle("dump");
crs = null;
// coverages first
for( String coveragePath : coveragePaths ) {
AbstractGridFormat format = GridFormatFinder.findFormat(coveragePath);
AbstractGridCoverage2DReader reader = format.getReader(coveragePath);
if (crs == null)
crs = reader.getCrs();
File styleFile = FileUtilities.substituteExtention(new File(coveragePath), "sld");
Style style;
if (styleFile.exists()) {
style = SldUtilities.getStyleFromFile(styleFile);
} else {
RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
style = SLD.wrapSymbolizers(sym);
}
GridReaderLayer layer = new GridReaderLayer(reader, style);
content.addLayer(layer);
}
for( int i = 0; i < featurePaths.size(); i++ ) {
String featurePath = featurePaths.get(i);
String filter = featureFilter.get(i);
FileDataStore store = FileDataStoreFinder.getDataStore(new File(featurePath));
SimpleFeatureSource featureSource = store.getFeatureSource();
SimpleFeatureCollection featureCollection;
if (filter.length() == 0) {
featureCollection = featureSource.getFeatures();
} else {
featureCollection = featureSource.getFeatures(ECQL.toFilter(filter));
}
if (crs == null)
crs = featureSource.getSchema().getCoordinateReferenceSystem();
File styleFile = FileUtilities.substituteExtention(new File(featurePath), "sld");
Style style;
if (styleFile.exists()) {
style = SldUtilities.getStyleFromFile(styleFile);
} else {
style = SLD.createSimpleStyle(featureSource.getSchema());
}
FeatureLayer layer = new FeatureLayer(featureCollection, style);
content.addLayer(layer);
}
renderer = new StreamingRenderer();
renderer.setMapContent(content );
}
/**
* Draw the map on an image.
*
* @param bounds the area of interest.
* @param imageWidth the width of the image to produce.
* @param imageHeight the height of the image to produce.
* @param buffer the buffer to add around the map bounds in map units.
* @return the image.
*/
public BufferedImage drawImage( Envelope bounds, int imageWidth, int imageHeight, double buffer ) {
if (renderer == null) {
throw new IllegalArgumentException("MapContent is not available. Did you call setLayers first?");
}
// now we have point and polygon
// create bounds
bounds.expandBy(buffer, buffer);
ReferencedEnvelope ref = new ReferencedEnvelope(bounds, crs);
content.getViewport().setBounds(ref);
setTransforms(ref, imageWidth, imageHeight);
BufferedImage dumpImage = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = dumpImage.createGraphics();
g2d.fillRect(0, 0, imageWidth, imageHeight);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Rectangle imgRec = new Rectangle(imageWidth, imageHeight);
renderer.paint(g2d, imgRec, ref, worldToScreen);
return dumpImage;
}
/**
* Writes an image of maps drawn to file.
*
* @param imagePath the path to which to write the image.
* @param bounds the area of interest.
* @param imageWidth the width of the image to produce.
* @param imageHeight the height of the image to produce.
* @param buffer the buffer to add around the map bounds in map units.
* @throws IOException
*/
public void dumpPngImage( String imagePath, Envelope bounds, int imageWidth, int imageHeight, double buffer )
throws IOException {
BufferedImage dumpImage = drawImage(bounds, imageWidth, imageHeight, buffer);
ImageIO.write(dumpImage, "png", new File(imagePath));
}
public void dispose(){
content.dispose();
}
private void setTransforms( final ReferencedEnvelope envelope, int width, int height ) {
double xscale = width / envelope.getWidth();
double yscale = height / envelope.getHeight();
double scale = Math.min(xscale, yscale);
double xoff = envelope.getMedian(0) * scale - width / 2;
double yoff = envelope.getMedian(1) * scale + height / 2;
worldToScreen = new AffineTransform(scale, 0, 0, -scale, -xoff, yoff);
// try {
// screenToWorld = worldToScreen.createInverse();
// } catch (NoninvertibleTransformException ex) {
// ex.printStackTrace();
// }
}
}
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