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現在、BufferedImageを介してJframeスイングコンポーネントに画像をロードしています。画像は正常に読み込まれましたが、ユーザーが画像の右下隅を選択してサイズを変更しようとすると、画像を伸縮可能にしたいので、可能になります。＆ユーザーはそのサイズ変更された画像を保存できますが、その方法は正確にはわかりません。誰かが私を案内してくれたら、とても感謝します。コード全体は必要ありませんが、ガイダンスとヒントだけが必要です。

私のコードは次のとおりです。

import java.io.File;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.color.ColorSpace;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import javax.imageio.ImageIO;

@SuppressWarnings("serial")
public class Brighten extends JPanel{
   @Override
   public void paintComponent(Graphics g){
      Graphics2D g2d=(Graphics2D)g;
      try{

          //reading image data from file

          BufferedImage src=ImageIO.read(new File("src.jpg"));

          /* passing source image and brightening by 50%-value of 1.0f means original brightness */
          BufferedImage dest=changeBrightness(src,1.5f);

          //drawing new image on panel
          g2d.drawImage(dest,0,0,this);

          //writing new image to a file in jpeg format
          ImageIO.write(dest,"jpeg",new File("dest.jpg"));
      }catch(Exception e){
            e.printStackTrace();
      }
   }


   public BufferedImage changeBrightness(BufferedImage src,float val){
       RescaleOp brighterOp = new RescaleOp(val, 0, null);
       return brighterOp.filter(src,null); //filtering
   }

   public static void main (String[] args) {
       JFrame jf=new JFrame("BRIGHTEN");
       Brighten obj=new Brighten();
       jf.getContentPane().add(obj);
       jf.setVisible(true);
       jf.setSize(325,270);
       jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
    }
}

誰かがすぐに私を助けてくれることを願っています..

4

2 に答える 2

4

これは基本的な例です。

ImagePanel画像のレンダリングを担当するスペシャルを使用します。カーソルの変更とサイズ変更操作を処理する独自のマウスリスナーがあります。

スケーリング アルゴリズムは分割統治法に基づいており、適度に高速で高品質なスケーリングを提供します。

斜めのサイズ変更は行っていません。お任せします ;)

ここに画像の説明を入力

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class ImageViewer {

    public static void main(String[] args) {
        new ImageViewer();
    }

    public ImageViewer() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new ViewPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ViewPane extends JPanel {

        public ViewPane() {
            setLayout(null);
            ImagePane imagePane = new ImagePane();
            imagePane.setSize(imagePane.getPreferredSize());
            imagePane.setLocation(0, 0);
            add(imagePane);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

    }

    public static class ImagePane extends JPanel {

        private BufferedImage bg;
        private BufferedImage scaled;

        public ImagePane() {
            try {
                bg = ImageIO.read(new File("C:\\hold\\thumbnails\\MT002.jpg"));
                scaled = getScaledInstanceToFit(bg, new Dimension(100, 100));
            } catch (IOException ex) {
                ex.printStackTrace();
            }

            setBackground(Color.BLACK);

            MouseHandler handler = new MouseHandler();
            addMouseListener(handler);
            addMouseMotionListener(handler);
        }

        @Override
        public Dimension getPreferredSize() {
            return bg == null ? new Dimension(200, 200) : new Dimension(scaled.getWidth(), scaled.getHeight());
        }

        @Override
        public void invalidate() {
            super.invalidate();
            scaled = getScaledInstanceToFit(bg, getSize());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            int x = (getWidth() - scaled.getWidth()) / 2;
            int y = (getHeight() - scaled.getHeight()) / 2;
            g2d.drawImage(scaled, x, y, this);
            g2d.dispose();
        }

        public enum MouseAction {

            Move(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR)),
            ResizeSouth(Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR)),
            ResizeNorth(Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR)),
            ResizeEast(Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR)),
            ResizeWest(Cursor.getPredefinedCursor(Cursor.W_RESIZE_CURSOR)),
            ResizeNorthEast(Cursor.getPredefinedCursor(Cursor.NE_RESIZE_CURSOR)),
            ResizeNorthWest(Cursor.getPredefinedCursor(Cursor.NW_RESIZE_CURSOR)),
            ResizeSouthEast(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR)),
            ResizeSouthWest(Cursor.getPredefinedCursor(Cursor.SW_RESIZE_CURSOR));

            private Cursor cursor;

            private MouseAction(Cursor cursor) {
                this.cursor = cursor;
            }

            public Cursor getCursor() {
                return cursor;
            }

        }

        public class MouseHandler extends MouseAdapter {

            private MouseAction action;
            private Point clickPoint;
            private Point offset;
            private boolean ignoreMoves;

            protected void updateAction(MouseEvent e) {
                int x = e.getX();
                int y = e.getY();

                int width = getWidth();
                int height = getHeight();

                if (x < 10 && y < 10) {
                    action = MouseAction.ResizeNorthWest;
                } else if (x > width - 10 && y < 10) {
                    action = MouseAction.ResizeNorthWest;
                } else if (y < 10) {
                    action = MouseAction.ResizeNorth;
                } else if (x < 10 && y > height - 10) {
                    action = MouseAction.ResizeSouthWest;
                } else if (x > width - 10 && y > height - 10) {
                    action = MouseAction.ResizeSouthEast;
                } else if (y > height - 10) {
                    action = MouseAction.ResizeSouth;
                } else if (x < 10) {
                    action = MouseAction.ResizeWest;
                } else if (x > width - 10) {
                    action = MouseAction.ResizeEast;
                } else {
                    action = MouseAction.Move;
                }
                setCursor(action.getCursor());
            }

            @Override
            public void mouseMoved(MouseEvent e) {
                if (!ignoreMoves) {
                    updateAction(e);
                }
            }

            @Override
            public void mousePressed(MouseEvent e) {
                updateAction(e);
                ignoreMoves = true;
                clickPoint = e.getPoint();
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                clickPoint = null;
                ignoreMoves = false;
            }

            @Override
            public void mouseDragged(MouseEvent e) {
                switch (action) {
                    case Move: {
                        Point p = e.getPoint();
                        p.x -= clickPoint.x;
                        p.y -= clickPoint.y;
                        p = SwingUtilities.convertPoint(ImagePane.this, p, getParent());
                        setLocation(p);
                    }
                    break;
                    case ResizeWest: {
                        Point p = e.getPoint();
                        int xDelta = p.x - clickPoint.x;
                        int width = getWidth() - xDelta;
                        int x = getX() + xDelta;
                        setSize(width, getHeight());
                        setLocation(x, getY());
                        revalidate();
                    }
                    break;
                    case ResizeEast: {
                        Point p = e.getPoint();
                        int xDelta = p.x - clickPoint.x;
                        int width = getWidth() + xDelta;
                        setSize(width, getHeight());
                        revalidate();
                        clickPoint = p;
                    }
                    break;
                    case ResizeNorth: {
                        Point p = e.getPoint();
                        int yDelta = p.y - clickPoint.y;
                        int height = getHeight() - yDelta;
                        int y = getY() + yDelta;
                        setSize(getWidth(), height);
                        setLocation(getX(), y);
                        revalidate();
                    }
                    break;
                    case ResizeSouth: {
                        Point p = e.getPoint();
                        int yDelta = p.y - clickPoint.y;
                        int height = getHeight() + yDelta;
                        setSize(getWidth(), height);
                        revalidate();
                        clickPoint = p;
                    }
                    break;
                }
            }

            @Override
            public void mouseExited(MouseEvent e) {
            }

        }

    }

    public static BufferedImage getScaledInstanceToFit(BufferedImage img, Dimension size) {
        double scaleFactor = getScaleFactorToFit(img, size);
        return getScaledInstance(img, scaleFactor);
    }

    public static BufferedImage getScaledInstance(BufferedImage img, double dScaleFactor) {
        BufferedImage imgBuffer = null;
        imgBuffer = getScaledInstance(img, dScaleFactor, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

        return imgBuffer;
    }

    protected static BufferedImage getScaledInstance(BufferedImage img, double dScaleFactor, Object hint) {
        BufferedImage imgScale = img;
        int iImageWidth = (int) Math.round(img.getWidth() * dScaleFactor);
        int iImageHeight = (int) Math.round(img.getHeight() * dScaleFactor);

        if (dScaleFactor <= 1.0d) {
            imgScale = getScaledDownInstance(img, iImageWidth, iImageHeight, hint);
        } else {
            imgScale = getScaledUpInstance(img, iImageWidth, iImageHeight, hint);
        }
        return imgScale;
    }

    protected static BufferedImage getScaledDownInstance(BufferedImage img,
            int targetWidth,
            int targetHeight,
            Object hint) {

//        System.out.println("Scale down...");
        int type = (img.getTransparency() == Transparency.OPAQUE)
                ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;

        BufferedImage ret = (BufferedImage) img;

        if (targetHeight > 0 || targetWidth > 0) {
            int w, h;
            // Use multi-step technique: start with original size, then
            // scale down in multiple passes with drawImage()
            // until the target size is reached
            w = img.getWidth();
            h = img.getHeight();

            do {
                if (w > targetWidth) {
                    w /= 2;
                    if (w < targetWidth) {
                        w = targetWidth;
                    }
                }

                if (h > targetHeight) {
                    h /= 2;
                    if (h < targetHeight) {
                        h = targetHeight;
                    }
                }

                BufferedImage tmp = new BufferedImage(Math.max(w, 1), Math.max(h, 1), type);
                Graphics2D g2 = tmp.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
                g2.drawImage(ret, 0, 0, w, h, null);
                g2.dispose();

                ret = tmp;
            } while (w != targetWidth || h != targetHeight);
        } else {
            ret = new BufferedImage(1, 1, type);
        }

        return ret;
    }

    protected static BufferedImage getScaledUpInstance(BufferedImage img,
            int targetWidth,
            int targetHeight,
            Object hint) {

        int type = BufferedImage.TYPE_INT_ARGB;

        BufferedImage ret = (BufferedImage) img;
        int w, h;
        w = img.getWidth();
        h = img.getHeight();

        do {
            if (w < targetWidth) {
                w *= 2;
                if (w > targetWidth) {
                    w = targetWidth;
                }
            }

            if (h < targetHeight) {
                h *= 2;
                if (h > targetHeight) {
                    h = targetHeight;
                }
            }

            BufferedImage tmp = new BufferedImage(w, h, type);
            Graphics2D g2 = tmp.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
            g2.drawImage(ret, 0, 0, w, h, null);
            g2.dispose();

            ret = tmp;
            tmp = null;
        } while (w != targetWidth || h != targetHeight);

        return ret;
    }

    public static double getScaleFactorToFit(BufferedImage img, Dimension size) {
        double dScale = 1;
        if (img != null) {
            int imageWidth = img.getWidth();
            int imageHeight = img.getHeight();
            dScale = getScaleFactorToFit(new Dimension(imageWidth, imageHeight), size);
        }
        return dScale;
    }

    public static double getScaleFactorToFit(Dimension original, Dimension toFit) {
        double dScale = 1d;
        if (original != null && toFit != null) {
            double dScaleWidth = getScaleFactor(original.width, toFit.width);
            double dScaleHeight = getScaleFactor(original.height, toFit.height);
            dScale = Math.min(dScaleHeight, dScaleWidth);
        }
        return dScale;
    }

    public static double getScaleFactor(int iMasterSize, int iTargetSize) {
        double dScale = 1;
        if (iMasterSize > iTargetSize) {
            dScale = (double) iTargetSize / (double) iMasterSize;
        } else {
            dScale = (double) iTargetSize / (double) iMasterSize;
        }
        return dScale;
    }
}

マウスリスナーを画像パネルではなくビューパネルの一部として持つ方が良いでしょう。そうすれば、2つのより良い再利用が可能になりますが、それはあなたに任せます

注意事項

レイアウトを扱うときnullは、コンテナ内のすべてのコンポーネントのサイズと位置に責任を持つことを知っておくことが重要です。これにより、作業負荷がいくらか増加するため、通常は回避する必要があります。

于 2013-08-05T09:06:29.937 に答える
0

同様の質問に対するこの回答を確認してください: Scala Java Image

メソッドを追加しgetScaledImage(...)、代わりに:

BufferedImage dest=changeBrightness(src,1.5f);

これを追加：

int width = this.getWidth();
int height = this.getHeight();
BufferedImage dest = getScaledImage(src, width, height);

次に、再描画のたびに画像がスケーリングされるコンポーネントを取得します。

于 2013-08-05T08:47:13.143 に答える