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annotate artifacts/src/main/java/org/dive4elements/river/jfree/AreaFillPattern.java @ 8910:d9c89651bd67

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Area chart layers may now have an 'arebgpattern'. Real pattern yet to be defined.
author gernotbelger
date Thu, 22 Feb 2018 18:46:37 +0100
parents
children 924cd9943337
rev   line source
8910
d9c89651bd67 Area chart layers may now have an 'arebgpattern'. Real pattern yet to be defined.
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1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by
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3 * Björnsen Beratende Ingenieure GmbH
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4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
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5 *
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6 * This file is Free Software under the GNU AGPL (>=v3)
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7 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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8 * documentation coming with Dive4Elements River for details.
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9 */
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10 package org.dive4elements.river.jfree;
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11
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12 import java.awt.Color;
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13 import java.awt.image.BufferedImage;
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14 import java.awt.image.BufferedImageOp;
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15 import java.awt.image.LookupOp;
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16 import java.io.IOException;
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17
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18 import javax.imageio.ImageIO;
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19
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20 import org.apache.log4j.Logger;
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21
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22 /**
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23 * Fill patterns for area styles.
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24 * REMARK: if this enum is changed, probably the ui in StyleEditorWindow must be changed too
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25 *
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26 * @author Gernot Belger
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27 */
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28 public enum AreaFillPattern {
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29
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30 pattern1("/images/areapatterns/pattern1.png");
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31
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32 private static Logger log = Logger.getLogger(AreaFillPattern.class);
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33
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34 private static final BufferedImage MISSING_IMAGE = new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
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35
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36 private final String imagePath;
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37
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38 private BufferedImage image = null;
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39
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40 AreaFillPattern(final String imagePath) {
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41 this.imagePath = imagePath;
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42 }
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43
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44 public BufferedImage getImage(final Color color) {
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45
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46 if (this.image == null)
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47 this.image = loadImage();
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48
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49 if (color == null)
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50 return this.image;
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51
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52 /*
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53 * apply color and transparency, the .png must be encoded as 32bit images (rgba), with only black as non transparent
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54 * color
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55 */
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56 final int numComponents = this.image.getColorModel().getNumComponents();
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57 if (numComponents != 4) {
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58 log.warn(String.format("Pattern image must be a 32bit image (rgba): %s", this.imagePath));
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59 return this.image;
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60 }
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61
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62 final BufferedImageOp lookup = new LookupOp(new ColorMapper(Color.black, color), null);
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63 return lookup.filter(this.image, null);
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64 }
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65
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66 private BufferedImage loadImage() {
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67 try {
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68 return ImageIO.read(getClass().getResource(this.imagePath));
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69 }
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70 catch (final IOException e) {
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71 log.error(String.format("failed ot load pattern: %s", this.imagePath), e);
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72 return MISSING_IMAGE;
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73 }
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74 }
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75 }
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