school-projects/ImgJava/src/main/java/io/gitlab/jfronny/ImgJava/imageProcessing/ImageUtil.java

package io.gitlab.jfronny.ImgJava.imageProcessing;

import io.gitlab.jfronny.ImgJava.util.Picture;

import java.awt.*;

/**
 * Algorithmen zur Änderung der Pixelpositionen eines Pictures
 * z.B. drehen, spiegeln usw.
 *
 * @author Thomas Schaller
 * @version 1.1 (28.11.2019)
 */
public class ImageUtil {
    /**
     * Horizontally mirrors an image (mutates original instance)
     *
     * @param picture Picture to mirror
     * @return The mirrored image
     */
    public static Picture mirror(Picture picture) {
        int w = picture.getWidth();
        int h = picture.getHeight();

        Color[][] pixel = picture.getPixelArray();
        Color[][] pixelNeu = new Color[w][h];

        for (int x = 0; x < w; x++) {
            System.arraycopy(pixel[(w - 1) - x], 0, pixelNeu[x], 0, h);
        }

        picture.setPixelArray(pixelNeu);
        return picture;
    }
}