source: extensions/jiwigo/trunk/src/main/java/fr/mael/jiwigo/ui/browser/BrowserImagePanel.java @ 6980

package fr.mael.jiwigo.ui.browser;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.util.Hashtable;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import fr.mael.jiwigo.transverse.util.ImagesUtil;
import fr.mael.jiwigo.transverse.util.Messages;

/**
   Copyright (c) 2010, Mael
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of jiwigo nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL Mael BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   
 * Panel qui affiche une image
 * @author mael
 *
 */
public class BrowserImagePanel extends JPanel implements MouseWheelListener, Printable, MouseMotionListener,
        MouseListener {
    private BufferedImage image;
    private double scale = 1.0;
    boolean flipH = false;
    boolean flipV = false;
    private int valueSlider = 16;
    private boolean clicked = false;
    private int xTopPosition;
    private int yTopPosition;
    private int xDragPosition;
    private int yDragPosition;
    private boolean drawSelection = false;

    /**
     * Constructor
     * @param image the image
     */
    public BrowserImagePanel(BufferedImage image) {
        this.image = image;
        this.addMouseWheelListener(this);
        this.addMouseMotionListener(this);
        this.addMouseListener(this);
    }

    /* (non-Javadoc)
     * @see javax.swing.JComponent#paintComponent(java.awt.Graphics)
     */
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        double x = (getWidth() - scale * image.getWidth()) / 2;
        double y = (getHeight() - scale * image.getHeight()) / 2;
        AffineTransform at = AffineTransform.getTranslateInstance(x, y);
        if (flipV && !flipH) {
            at.scale(scale, -scale);
            at.translate(0, -getHeight() / 2);
        } else if (flipH && !flipV) {
            at.scale(-scale, scale);
            at.translate(-getWidth() / 2, 0);
        } else if (flipH && flipV) {
            at.scale(-scale, -scale);
            at.translate(-getWidth() / 2, -getHeight() / 2);
        } else {
            at.scale(scale, scale);
        }
        g2.drawRenderedImage(image, at);
        if (drawSelection) {
            g2.drawRect(xTopPosition, yTopPosition, xDragPosition - xTopPosition, yDragPosition - yTopPosition);
        }

    }

    /* (non-Javadoc)
     * @see javax.swing.JComponent#getPreferredSize()
     */
    public Dimension getPreferredSize() {
        int w = (int) (scale * image.getWidth());
        int h = (int) (scale * image.getHeight());
        return new Dimension(w, h);
    }

    public void rogner() {
        if (scale == 1.0) {
            //gets the dimensions of the image
            Double width = getSize().getWidth();
            Double height = getSize().getHeight();
            //get the top left corner
            Double xZeroImage = ((width - image.getWidth()) / 2);
            Double yZeroImage = ((height - image.getHeight()) / 2);
            //the position of the first click on the imagee
            //The previous positions where the ones on the panel
            //have to calculate the position on the image
            int positionX, positionY;
            //width and height of the clip
            int largeur, longueur;
            //if the selection begins before the beginning of the image in x
            //0 is taken. Otherwise the position of the click is calculated :
            //position on the image = position on the panel - position of the x of the image
            if (xTopPosition - xZeroImage.intValue() < 0) {
                positionX = 0;
            } else {
                positionX = xTopPosition - xZeroImage.intValue();
            }
            //if the selection begins before the beginning of the image in y
            //0 is taken. Otherwise the position of the click is calculated :
            //position on the image = position on the panel - position of the y of the image
            if (yTopPosition - yZeroImage.intValue() < 0) {
                positionY = 0;
            } else {
                positionY = yTopPosition - yZeroImage.intValue();
            }
            //calculates the width
            largeur = xDragPosition - xTopPosition;
            //if it goes past the image
            if ((positionX + largeur) > image.getWidth()) {
                //the width is recalculated
                largeur = image.getWidth() - positionX;
            }
            //calculate the height
            longueur = yDragPosition - yTopPosition;
            ////if it goes past the image
            if ((positionY + longueur) > image.getHeight()) {
                //the height is recalculated
                longueur = image.getHeight() - positionY;
            }
            //gets the cutted imagee
            image = image.getSubimage(positionX, positionY, largeur, longueur);
            repaint();
            revalidate();
            drawSelection = false;
        } else {
            JOptionPane.showMessageDialog(this, Messages.getMessage("clippingError"), Messages.getMessage("info"),
                    JOptionPane.INFORMATION_MESSAGE);
        }
    }

    /**
     * gets the slider
     * @return the slider
     */
    public JSlider getSlider() {
        int min = 1, max = 36, inc = 10;
        final JSlider slider = new JSlider(min, max, 16);
        slider.setMajorTickSpacing(5);
        slider.setMinorTickSpacing(1);
        slider.setPaintTicks(true);
        slider.setSnapToTicks(true);
        slider.setLabelTable(getLabelTable(min, max, inc));
        slider.setPaintLabels(true);
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                int value = slider.getValue();
                valueSlider = value;
                scale = (value + 4) / 20.0;
                revalidate();
                repaint();
            };
        });
        return slider;
    }

    public void zoomIn() {

        scale = (++valueSlider + 4) / 20.0;
        revalidate();
        repaint();
    }

    public void zoomOut() {
        if (scale > 0) {
            scale = (--valueSlider + 4) / 20.0;
            revalidate();
            repaint();
        }
    }

    public void zoomNormal() {

        scale = 1.0;
        revalidate();
        repaint();
    }

    /**
     * Label of the slider
     * @param min
     * @param max
     * @param inc
     * @return
     */
    private Hashtable getLabelTable(int min, int max, int inc) {
        Hashtable<Integer, JLabel> table = new Hashtable<Integer, JLabel>();
        for (int j = min; j <= max; j += inc) {
            String s = String.format("%.2f", (j + 4) / 20.0);
            table.put(Integer.valueOf(j), new JLabel(s));
        }
        return table;
    }

    /**
     *  right rotation
     */
    public void rotationDroite() {
        setImage(ImagesUtil.rotate(image, Math.PI / 2));
    }

    /**
     * left rotation
     */
    public void rotationGauche() {
        setImage(ImagesUtil.rotate(image, -Math.PI / 2));
    }

    /**
     * @return the image
     */
    public BufferedImage getImage() {
        return image;
    }

    /**
     * @param image the image to set
     */
    public void setImage(BufferedImage image) {
        this.image = image;
        revalidate();
        repaint();
    }

    /**
     * @return the drawSelection
     */
    public boolean isDrawSelection() {
        return drawSelection;
    }

    /**
     * @param drawSelection the drawSelection to set
     */
    public void setDrawSelection(boolean drawSelection) {
        this.drawSelection = drawSelection;
    }

    @Override
    public void mouseWheelMoved(MouseWheelEvent arg0) {
        int notches = arg0.getWheelRotation();
        String message;
        String newline = "\n";
        if (notches < 0) {
            zoomIn();

        } else {
            zoomOut();
        }

    }

    @Override
    public int print(Graphics arg0, PageFormat arg1, int arg2) throws PrinterException {
        if (arg2 != 0)
            return NO_SUCH_PAGE;
        Graphics2D g2 = (Graphics2D) arg0;
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        double x = (getWidth() - scale * image.getWidth()) / 2;
        double y = (getHeight() - scale * image.getHeight()) / 2;
        AffineTransform at = AffineTransform.getTranslateInstance(x, y);
        if (flipV && !flipH) {
            at.scale(scale, -scale);
            at.translate(0, -getHeight() / 2);
        } else if (flipH && !flipV) {
            at.scale(-scale, scale);
            at.translate(-getWidth() / 2, 0);
        } else if (flipH && flipV) {
            at.scale(-scale, -scale);
            at.translate(-getWidth() / 2, -getHeight() / 2);
        } else {
            at.scale(scale, scale);
        }

        g2.drawRenderedImage(image, at);
        return PAGE_EXISTS;
    }

    @Override
    public void mouseDragged(MouseEvent arg0) {
        if (clicked) {
            xDragPosition = arg0.getX();
            yDragPosition = arg0.getY();
            repaint();
            revalidate();
        }
    }

    @Override
    public void mouseMoved(MouseEvent arg0) {
    }

    public void mouseClicked(MouseEvent arg0) {
    }

    public void mouseEntered(MouseEvent arg0) {
    }

    public void mouseExited(MouseEvent arg0) {
    }

    public void mousePressed(MouseEvent arg0) {
        clicked = true;
        xTopPosition = arg0.getX();
        yTopPosition = arg0.getY();
        drawSelection = true;
    }

    public void mouseReleased(MouseEvent arg0) {
        clicked = false;
    }

}