db_9/db/Converter.java

package edu.hsog.db;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.Icon;


public class Converter {

    public static Icon loadIconFromFile(String path) {
        ImageIcon icon = new ImageIcon(path);
        Image image = icon.getImage();
        int maxX, maxY, max;
        double ratio = 0;
        maxX = image.getWidth(null);
        maxY = image.getHeight(null);
        max = Math.max(maxX, maxY);
        ratio = (250.0 / (float) max);
        image = image.getScaledInstance((int) (maxX * ratio),
                (int) (maxY * ratio), Image.SCALE_DEFAULT);
        ImageIcon ic = new ImageIcon(image);
        return (Icon) ic;
    }

    public static ImageIcon image2ImageIcon(Image i) {
        if (i == null) return null;

        ImageIcon ic = new ImageIcon(i);
        return ic;
    }

    public static Image imageIcon2Image(ImageIcon ic) {
        if (ic == null) return null;

        Image i = ic.getImage();
        return i;
    }

    public static Blob imageIcon2Blob(ImageIcon myImageIcon, Connection con) {
        if (myImageIcon == null) return null;
        Blob myBlob = null;

        try {

            ByteArrayOutputStream myByteArrayOutputStream = new ByteArrayOutputStream();
            BufferedImage buImg = new BufferedImage(myImageIcon.getIconWidth(), myImageIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
            buImg.getGraphics().drawImage(myImageIcon.getImage(), 0, 0, myImageIcon.getImageObserver());
            ImageIO.write(buImg, "png", myByteArrayOutputStream);
            byte[] myByteArray = myByteArrayOutputStream.toByteArray();
            myBlob = con.createBlob();
            myBlob.setBytes(1, myByteArray);
        } catch (Exception ex) {
            Logger.getLogger(Converter.class.getName()).log(Level.SEVERE, null, ex);
        }
        return myBlob;
    }

    public static Blob icon2Blob(Icon myIcon, Connection con) {
        return imageIcon2Blob((ImageIcon) myIcon, con);
    }

    public static ImageIcon blob2ImageIcon(Blob myBlob) {

        if (myBlob == null) return null;

        ImageIcon myImageIcon = null;
        try {
            byte[] byteArray = myBlob.getBytes((long) 1, (int) myBlob.length());
            myImageIcon = new ImageIcon(byteArray);

        } catch (SQLException ex) {
            Logger.getLogger(Converter.class.getName()).log(Level.SEVERE, null, ex);
        }
        return myImageIcon;
    }

    public static Icon blob2Icon(Blob myBlob) {
        return (Icon) blob2ImageIcon(myBlob);
    }

    public static BufferedImage iconToBufferedImage(Icon icon) {
        // Create a buffered image with the same dimensions as the icon
        BufferedImage image = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
        Graphics g = image.createGraphics();

        // Paint the icon onto the buffered image
        icon.paintIcon(null, g, 0, 0);
        g.dispose();

        return image;
    }

    public static Icon mergeIcons(ArrayList<Icon> icons) {
        int iconsPerRow = 3;
        if (icons == null || icons.isEmpty()) {
            throw new IllegalArgumentException("Die Icon-Liste darf nicht leer sein.");
        }
        if (iconsPerRow <= 0) {
            throw new IllegalArgumentException("Die Anzahl der Icons pro Zeile muss größer als 0 sein.");
        }

        // Berechnung der Dimensionen des kombinierten Icons
        int rows = (int) Math.ceil((double) icons.size() / iconsPerRow); // Gesamtanzahl der Zeilen
        int maxWidth = 0;
        int totalHeight = 0;
        int[] rowHeights = new int[rows]; // Speichert die maximale Höhe jeder Zeile

        for (int row = 0; row < rows; row++) {
            int currentRowWidth = 0;
            int currentRowHeight = 0;

            for (int col = 0; col < iconsPerRow; col++) {
                int index = row * iconsPerRow + col;
                if (index >= icons.size()) break; // Keine weiteren Icons

                Icon icon = icons.get(index);
                currentRowWidth += icon.getIconWidth();
                currentRowHeight = Math.max(currentRowHeight, icon.getIconHeight());
            }

            maxWidth = Math.max(maxWidth, currentRowWidth);
            totalHeight += currentRowHeight;
            rowHeights[row] = currentRowHeight;
        }

        // Neues kombiniertes Bild erstellen
        BufferedImage combinedImage = new BufferedImage(maxWidth, totalHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics g = combinedImage.getGraphics();

        // Icons zeichnen
        int currentY = 0;
        for (int row = 0; row < rows; row++) {
            int currentX = 0;
            for (int col = 0; col < iconsPerRow; col++) {
                int index = row * iconsPerRow + col;
                if (index >= icons.size()) break;

                Icon icon = icons.get(index);
                icon.paintIcon(null, g, currentX, currentY);
                currentX += icon.getIconWidth();
            }
            currentY += rowHeights[row];
        }

        g.dispose();

        // Kombiniertes Bild als Icon zurückgeben
        return new ImageIcon(resizeTo250x250(combinedImage));
    }

    public static BufferedImage resizeTo250x250(BufferedImage originalImage) {
        if (originalImage == null) {
            throw new IllegalArgumentException("Das Bild darf nicht null sein.");
        }

        // Neue Dimensionen für das Bild
        int targetWidth = 200;
        int targetHeight = 300;

        // Erstelle ein neues BufferedImage mit den Zielmaßen
        BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_ARGB);

        // Zeichne das originale Bild auf das neue Bild mit Skalierung
        Graphics2D g2d = resizedImage.createGraphics();
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g2d.drawImage(originalImage, 0, 0, targetWidth, targetHeight, null);
        g2d.dispose();

        return resizedImage;
    }

    public static Icon generatePatternIcon() {
        // Bildgröße
        int width = 250;
        int height = 250;

        // Erstelle ein BufferedImage
        BufferedImage patternImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        // Muster erzeugen (z.B. Rechteckmuster mit zufälligen Farben)
        Graphics2D g2d = patternImage.createGraphics();

        for (int y = 0; y < height; y += 25) { // Abstand der horizontalen Streifen
            for (int x = 0; x < width; x += 25) { // Abstand der vertikalen Streifen
                // Erzeuge eine zufällige Farbe
                Color randomColor = new Color(
                        (int) (Math.random() * 255), // Rot
                        (int) (Math.random() * 255), // Grün
                        (int) (Math.random() * 255)  // Blau
                );

                // Zeichne Rechtecke für das Muster
                g2d.setColor(randomColor);
                g2d.fillRect(x, y, 25, 25);
            }
        }

        g2d.dispose();

        // Rückgabe des generierten Musters als Icon
        return new ImageIcon(patternImage);
    }
}