Ciao Steve,
I need a couple more info about your platform:
>java version
>os
>JAI and ImageIO version
I ran your example as it was (well, to be honest I removed the line where
you were showing the created coverage) and I got the following execution
time:
PROCESSING TIME: 7.86 SECONDS
I am using geotools 2.3.x compiled from SVN.
If you provide me with more info, I can try to spot the cause of your
problems.
Thx,
Simone.
----- Original Message -----
From: Steve.Ansari
To: Andrea Aime
Cc: geotools-gt2-users@lists.sourceforge.net
Sent: Sunday, February 04, 2007 6:04 PM
Subject: Re: [Geotools-gt2-users] Slow rendering of GridCoverage objects
Hi Andrea/Simone/Martin,
I threw together a quick example that reproduces the problem. It took 159
seconds to produce the image.
Thanks again for the help.
Steve
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.WritableRaster;
import java.io.File;
import javax.imageio.ImageIO;
import javax.media.jai.RasterFactory;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridCoverageFactory;
import org.geotools.geometry.GeneralEnvelope;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.MapContext;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.renderer.lite.StreamingRenderer;
import org.geotools.styling.RasterSymbolizer;
import org.geotools.styling.Style;
import org.geotools.styling.StyleBuilder;
public class RenderGridCoverageExample {
public static void main(String[] args) {
try {
// 1) Create dummy GridCoverage
int width = 800; // set to 400 to create another exception when
scaleX*scaleY > 1.0
int height = 800;
long startTime = System.currentTimeMillis();
GridCoverageFactory gcFactory = new GridCoverageFactory();
java.awt.geom.Rectangle2D.Double rect =
new java.awt.geom.Rectangle2D.Double(-80.0, 30.0, 5.0, 5.0);
GeneralEnvelope envelope = new GeneralEnvelope(rect);
envelope.setCoordinateReferenceSystem(DefaultGeographicCRS.WGS84);
WritableRaster raster =
RasterFactory.createBandedRaster(DataBuffer.TYPE_FLOAT, width, height, 1,
null);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
raster.setSample(i, j, 0, i*j);
}
}
double[] minValues = new double[] { 0.0 };
double[] maxValues = new double[] { width*height };
Color[] colors = new Color[] { Color.BLUE, Color.GREEN };
GridCoverage2D gc = gcFactory.create("My colored coverage",
raster,
envelope, minValues, maxValues, null, new
Color[][]{colors}, null);
gc.show();
// 2) Create MapContext
MapContext context = new
DefaultMapContext(DefaultGeographicCRS.WGS84);
// 3 Add GridCoverage
final StyleBuilder sb = new StyleBuilder();
final RasterSymbolizer rs = sb.createRasterSymbolizer();
Style style = sb.createStyle(rs);
context.addLayer(gc, style);
// 4) init renderer
StreamingRenderer renderer = new StreamingRenderer();
// 5) set context in renderer
renderer.setContext(context);
// 6) init image (large black rectangle)
BufferedImage bufImage = new BufferedImage(800, 600,
BufferedImage.TYPE_INT_ARGB);
// 7) create ReferencedEnvelope
ReferencedEnvelope refEnv = new ReferencedEnvelope(envelope,
context.getCoordinateReferenceSystem());
// 8) paint the context onto the blank image
renderer.paint(
(Graphics2D)bufImage.getGraphics(),
new Rectangle(bufImage.getWidth(),
bufImage.getHeight()),
adjustGeographicBounds(bufImage, refEnv));
// 9) write image
ImageIO.write(bufImage, "png", new
File("RenderGridCoverageExample.png"));
System.out.println("PROCESSING TIME:
"+(System.currentTimeMillis()-startTime)/1000.0+" SECONDS");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static ReferencedEnvelope adjustGeographicBounds(BufferedImage
image, ReferencedEnvelope bounds) {
double imgRatio = (double)image.getWidth() /
(double)image.getHeight();
double geoRatio = bounds.getWidth() / bounds.getHeight();
double dlon = bounds.getWidth();
double dlat = bounds.getHeight();
double geoCenterX = bounds.getMinX() + (dlon / 2.0);
double geoCenterY = bounds.getMinY() + (dlat / 2.0);
double x = imgRatio / geoRatio;
if (x > 1.0) {
dlon = dlon * x;
}
else {
dlat = dlat / x;
}
return new ReferencedEnvelope(
geoCenterX + dlon / 2.0,
geoCenterX - dlon / 2.0,
geoCenterY + dlat / 2.0,
geoCenterY - dlat / 2.0,
bounds.getCoordinateReferenceSystem()
);
} // end adjustGeographicBounds()
}
Andrea Aime wrote:
Steve.Ansari ha scritto:
Hi Andrea,
I'm manually creating the GridCoverage from a WritableRaster using:
GridCoverage2D gc = gcFactory.create("My colored coverage", raster,
envelope, minValues, maxValues, null, new Color[][]{colors},
null);
Ouch... it shouldn't be that slow. Hopefully Simone or Martin will know
more about this.
Can you give us a self-contained program that exhibits this poor behavior?
Cheers
Andrea
-------------------------------------------------------------------------
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--
Steve Ansari
Physical Scientist
NOAA's National Climatic Data Center
Veach-Baley Federal Building
151 Patton Avenue
Asheville, NC 28801
Ph: 828-271-4611
Fax: 828-271-4022
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job
easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Geotools-gt2-users mailing list
Geotools-gt2-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Geotools-gt2-users mailing list
Geotools-gt2-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
