gernotbelger@8910: /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
gernotbelger@8910:  * Software engineering by
gernotbelger@8910:  *  Björnsen Beratende Ingenieure GmbH
gernotbelger@8910:  *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
gernotbelger@8910:  *
gernotbelger@8910:  * This file is Free Software under the GNU AGPL (>=v3)
gernotbelger@8910:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
gernotbelger@8910:  * documentation coming with Dive4Elements River for details.
gernotbelger@8910:  */
gernotbelger@8910: package org.dive4elements.river.jfree;
gernotbelger@8910: 
gernotbelger@8910: import java.awt.Color;
gernotbelger@8910: import java.awt.image.BufferedImage;
gernotbelger@8910: import java.awt.image.BufferedImageOp;
gernotbelger@8910: import java.awt.image.LookupOp;
gernotbelger@8910: import java.io.IOException;
gernotbelger@8910: 
gernotbelger@8910: import javax.imageio.ImageIO;
gernotbelger@8910: 
gernotbelger@8910: import org.apache.log4j.Logger;
gernotbelger@8910: 
gernotbelger@8910: /**
gernotbelger@8910:  * Fill patterns for area styles.
gernotbelger@8910:  * REMARK: if this enum is changed, probably the ui in StyleEditorWindow must be changed too
gernotbelger@8910:  *
gernotbelger@8910:  * @author Gernot Belger
gernotbelger@8910:  */
gernotbelger@8910: public enum AreaFillPattern {
gernotbelger@8910: 
gernotbelger@8910:     pattern1("/images/areapatterns/pattern1.png");
gernotbelger@8910: 
gernotbelger@8910:     private static Logger log = Logger.getLogger(AreaFillPattern.class);
gernotbelger@8910: 
gernotbelger@8910:     private static final BufferedImage MISSING_IMAGE = new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
gernotbelger@8910: 
gernotbelger@8910:     private final String imagePath;
gernotbelger@8910: 
gernotbelger@8910:     private BufferedImage image = null;
gernotbelger@8910: 
gernotbelger@8910:     AreaFillPattern(final String imagePath) {
gernotbelger@8910:         this.imagePath = imagePath;
gernotbelger@8910:     }
gernotbelger@8910: 
gernotbelger@8910:     public BufferedImage getImage(final Color color) {
gernotbelger@8910: 
gernotbelger@8910:         if (this.image == null)
gernotbelger@8910:             this.image = loadImage();
gernotbelger@8910: 
gernotbelger@8910:         if (color == null)
gernotbelger@8910:             return this.image;
gernotbelger@8910: 
gernotbelger@8910:         /*
gernotbelger@8910:          * apply color and transparency, the .png must be encoded as 32bit images (rgba), with only black as non transparent
gernotbelger@8910:          * color
gernotbelger@8910:          */
gernotbelger@8910:         final int numComponents = this.image.getColorModel().getNumComponents();
gernotbelger@8910:         if (numComponents != 4) {
gernotbelger@8910:             log.warn(String.format("Pattern image must be a 32bit image (rgba): %s", this.imagePath));
gernotbelger@8910:             return this.image;
gernotbelger@8910:         }
gernotbelger@8910: 
gernotbelger@8910:         final BufferedImageOp lookup = new LookupOp(new ColorMapper(Color.black, color), null);
gernotbelger@8910:         return lookup.filter(this.image, null);
gernotbelger@8910:     }
gernotbelger@8910: 
gernotbelger@8910:     private BufferedImage loadImage() {
gernotbelger@8910:         try {
gernotbelger@8910:             return ImageIO.read(getClass().getResource(this.imagePath));
gernotbelger@8910:         }
gernotbelger@8910:         catch (final IOException e) {
gernotbelger@8910:             log.error(String.format("failed ot load pattern: %s", this.imagePath), e);
gernotbelger@8910:             return MISSING_IMAGE;
gernotbelger@8910:         }
gernotbelger@8910:     }
gernotbelger@8910: }