Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/services/AbstractChartService.java @ 6061:e9a76ffa0f9a
Use maxOverlap to get the correct gauge for the MainValues
Previously just the first matching gauge was taken even if it's
range ended with the minimum value. This code is clearly intended
to get one gauge for one range so the best match should be taken.
author | Andre Heinecke <aheinecke@intevation.de> |
---|---|
date | Wed, 22 May 2013 18:10:48 +0200 |
parents | af13ceeba52a |
children | c16d04f2c5bc |
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde * Software engineering by Intevation GmbH * * This file is Free Software under the GNU AGPL (>=v3) * and comes with ABSOLUTELY NO WARRANTY! Check out the * documentation coming with Dive4Elements River for details. */ package org.dive4elements.river.artifacts.services; import java.awt.Dimension; import java.awt.Transparency; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import org.apache.log4j.Logger; import org.jfree.chart.JFreeChart; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import org.dive4elements.artifactdatabase.DefaultService; import org.dive4elements.artifacts.CallMeta; import org.dive4elements.artifacts.GlobalContext; import org.dive4elements.artifacts.Service; /** Serve chart. */ public abstract class AbstractChartService extends DefaultService { public static final int DEFAULT_WIDTH = 240; public static final int DEFAULT_HEIGHT = 180; public static final String DEFAULT_FORMAT = "png"; private static final Logger log = Logger .getLogger(AbstractChartService.class); // TODO: Load fancy image from resources. public static final byte[] EMPTY = { (byte) 0x89, (byte) 0x50, (byte) 0x4e, (byte) 0x47, (byte) 0x0d, (byte) 0x0a, (byte) 0x1a, (byte) 0x0a, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0d, (byte) 0x49, (byte) 0x48, (byte) 0x44, (byte) 0x52, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x08, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x3a, (byte) 0x7e, (byte) 0x9b, (byte) 0x55, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x73, (byte) 0x52, (byte) 0x47, (byte) 0x42, (byte) 0x00, (byte) 0xae, (byte) 0xce, (byte) 0x1c, (byte) 0xe9, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x09, (byte) 0x70, (byte) 0x48, (byte) 0x59, (byte) 0x73, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x01, (byte) 0x00, (byte) 0x9a, (byte) 0x9c, (byte) 0x18, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x07, (byte) 0x74, (byte) 0x49, (byte) 0x4d, (byte) 0x45, (byte) 0x07, (byte) 0xdc, (byte) 0x04, (byte) 0x04, (byte) 0x10, (byte) 0x30, (byte) 0x15, (byte) 0x7d, (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x08, (byte) 0x74, (byte) 0x45, (byte) 0x58, (byte) 0x74, (byte) 0x43, (byte) 0x6f, (byte) 0x6d, (byte) 0x6d, (byte) 0x65, (byte) 0x6e, (byte) 0x74, (byte) 0x00, (byte) 0xf6, (byte) 0xcc, (byte) 0x96, (byte) 0xbf, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0a, (byte) 0x49, (byte) 0x44, (byte) 0x41, (byte) 0x54, (byte) 0x08, (byte) 0xd7, (byte) 0x63, (byte) 0xf8, (byte) 0x0f, (byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x00, (byte) 0x1b, (byte) 0xb6, (byte) 0xee, (byte) 0x56, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49, (byte) 0x45, (byte) 0x4e, (byte) 0x44, (byte) 0xae, (byte) 0x42, (byte) 0x60, (byte) 0x82 }; private static final Output empty() { return new Output(EMPTY, "image/png"); } protected abstract JFreeChart createChart(Document data, GlobalContext globalContext, CallMeta callMeta); protected void init() { }; protected void finish() { }; @Override public Service.Output process(Document data, GlobalContext globalContext, CallMeta callMeta) { log.debug("process"); init(); try { JFreeChart chart = createChart(data, globalContext, callMeta); if (chart == null) { return empty(); } Dimension extent = getExtent(data); String format = getFormat(data); return encode(chart, extent, format); } finally { finish(); } } protected static Output encode(JFreeChart chart, Dimension extent, String format) { BufferedImage image = chart.createBufferedImage(extent.width, extent.height, Transparency.BITMASK, null); ByteArrayOutputStream out = new ByteArrayOutputStream(); try { ImageIO.write(image, format, out); } catch (IOException ioe) { log.warn("writing image failed", ioe); return empty(); } return new Output(out.toByteArray(), "image/" + format); } protected static Dimension getExtent(Document input) { int width = DEFAULT_WIDTH; int height = DEFAULT_HEIGHT; NodeList extents = input.getElementsByTagName("extent"); if (extents.getLength() > 0) { Element element = (Element) extents.item(0); String w = element.getAttribute("width"); String h = element.getAttribute("height"); try { width = Math.max(1, Integer.parseInt(w)); } catch (NumberFormatException nfe) { log.warn("width '" + w + "' is not a valid."); } try { height = Math.max(1, Integer.parseInt(h)); } catch (NumberFormatException nfe) { log.warn("height '" + h + "' is not a valid"); } } return new Dimension(width, height); } protected static String getFormat(Document input) { String format = DEFAULT_FORMAT; NodeList formats = input.getElementsByTagName("format"); if (formats.getLength() > 0) { String type = ((Element) formats.item(0)).getAttribute("type"); if (type.length() > 0) { format = type; } } return format; } }