Thank you Alex.
I got there in the end with a bit of work. Below is the method I have. I found
that a good thing to do was to set imageWidth and imageHeight, by fixing in my
case the imageWidth using the following:
ReferencedEnvelope re = mapContent.getMaxBounds();
double height = re.getHeight();
double width = re.getWidth();
System.out.println("height " + height + ", width " + width);
double heightToWidth = height / width;
int imageWidth = 500;
int imageHeight = (int) (imageWidth * heightToWidth);
/**
* Render and output the mapContent and save to a file.
* @param mapContent The map to be written.
* @param imageWidth The width of the image to be produced.
* @param imageHeight The height of the image to be produced.
* @param outputImageFile The file to be written to.
* @param outputType The image file type e.g. "png"
*/
public void writeImageFile(
MapContent mapContent,
int imageWidth,
int imageHeight,
File outputImageFile,
String outputType) {
// Initialise a renderer
StreamingRenderer renderer = new StreamingRenderer();
renderer.setMapContent(mapContent);
Rectangle rectangle = new Rectangle(imageWidth, imageHeight);
System.out.println(rectangle.height + " " + rectangle.width);
BufferedImage bufferedImage;
bufferedImage = new BufferedImage(
rectangle.width,
rectangle.height,
//BufferedImage.TYPE_INT_RGB);
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = bufferedImage.createGraphics();
// Set white background
//graphics2D.setComposite(AlphaComposite.Clear);
graphics2D.setBackground(Color.white);
graphics2D.fillRect(0, 0, imageWidth, imageHeight);
//graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
0));
// Render onto background
//graphics2D.setComposite(AlphaComposite.Src);
renderer.paint(graphics2D, rectangle, mapContent.getMaxBounds());
//wait(this, 4000);
try {
ImageIO.write(
bufferedImage,
outputType,
outputImageFile);
} catch (IOException ex) {
Logger.getLogger(Select.class.getName()).log(Level.SEVERE, null,
ex);
}
//wait(this, 4000);
graphics2D.dispose();
}
Thanks again,
Andy
________________________________________
From: Alex Davies-Moore [[email protected]]
Sent: 11 November 2014 13:43
To: [email protected]
Subject: Re: [Geotools-gt2-users] Output to image file format
Hi Andy,
Don't know if it helps or not, but if you look at the class
https://bitbucket.org/mapsum/maprocket-tileserver/src/ee045bb240e24091d7ecfeef1a151eca16c3ed4e/src/main/java/com/mapsum/maprocket/gis/wms/WMSHttpHandler.java?at=master
I use it to output an image file as part of a WMS request. The bit you want is
probably everything from line 106 - 154.
HTH
Alex
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Alex Davies-Moore / Developer
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On 11 November 2014 12:30, Andy Turner
<[email protected]<mailto:[email protected]>> wrote:
Hi geotools-gt2-users,
Recently I started using GeoTools again for a project where I want to automate
the production of a set of maps.
I've managed to get some maps displayed on screen using a JMapFrame.
Does anyone know a good way to write the display out to an image file?
Thanks for your help,
Andy
http://www.geog.leeds.ac.uk/people/a.turner/index.html
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