decorate onSignature method

1 files changed, 549 insertions, 549 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SignaturePanel.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SignaturePanel.java
index 193f5974..575c8f86 100644
--- a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SignaturePanel.java
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SignaturePanel.java
@@ -1,549 +1,549 @@
-/*
- * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
- *
- * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
- * the European Commission - subsequent versions of the EUPL (the "Licence");
- * You may not use this work except in compliance with the Licence.
- * You may obtain a copy of the Licence at:
- * http://joinup.ec.europa.eu/software/page/eupl
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the Licence is distributed on an "AS IS" basis,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the Licence for the specific language governing permissions and
- * limitations under the Licence.
- */
-package at.asit.pdfover.gui.composites;
-
-// Imports
-import java.awt.BorderLayout;
-import java.awt.Color;
-import java.awt.Cursor;
-import java.awt.Dimension;
-import java.awt.Graphics;
-import java.awt.Image;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseEvent;
-import java.awt.geom.AffineTransform;
-import java.awt.geom.NoninvertibleTransformException;
-import java.awt.geom.Point2D;
-import java.awt.geom.Rectangle2D;
-import java.awt.image.BufferedImage;
-
-import javax.swing.JPanel;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import at.asit.pdfover.gui.Constants;
-import at.asit.pdfover.gui.utils.Messages;
-
-import com.sun.pdfview.PDFFile;
-import com.sun.pdfview.PDFPage;
-
-/**
- * 
- */
-public class SignaturePanel extends JPanel {
-	/**
-	 * SLF4J Logger instance
-	 **/
-	private static final Logger log = LoggerFactory
-			.getLogger(SignaturePanel.class);
-
-	/** Default serial version ID */
-	private static final long serialVersionUID = 1L;
-
-	/** The PDF file being displayed */
-	private PDFFile pdf = null;
-	/** The image of the rendered PDF page being displayed */
-	Image currentImage = null;
-	/** The current PDFPage that was rendered into currentImage */
-	private PDFPage currentPage = null;
-	/** The current transform from screen to page space */
-	AffineTransform currentXform = null;
-	/** The horizontal offset of the image from the left edge of the panel */
-	int offX = 0;
-	/** The vertical offset of the image from the top of the panel */
-	int offY = 0;
-	/** The size of the image */
-	private Dimension prevSize = null;
-	/** The position of the signature, in page space */
-	Point2D sigPagePos = null;
-	/** The position of the signature, in screen space */
-	Point2D sigScreenPos = null;
-	/** The signature placeholder image */
-	private Image sigPlaceholder = null;
-	/** Current scaled signature placeholder image */
-	BufferedImage sigPlaceholderScaled = null;
-	/** Transparency of the signature placeholder (0-255) */
-	private int sigPlaceholderTransparency = Constants.DEFAULT_SIGNATURE_PLACEHOLDER_TRANSPARENCY;
-	/** Previous Transparency of the signature placeholder */
-	private int prevSigPlaceholderTransparency = 0;
-	/** Width of the signature placeholder in page space */
-	private int sigPageWidth = 0;
-	/** Height of the signature placeholder in page space */
-	private int sigPageHeight = 0;
-	/** Width of the signature placeholder in screen space */
-	int sigScreenWidth = 0;
-	/** Height of the signature placeholder in screen space */
-	int sigScreenHeight = 0;
-	/** Previous Width of the signature placeholder in screen space */
-	int prevSigScreenWidth = 0;
-	/** Previous Height of the signature placeholder in screen space */
-	int prevSigScreenHeight = 0;
-	/** Color of the signature placeholder border */
-	private Color sigPlaceholderBorderColor = Color.BLUE;
-	/** Current page */
-	int page = 0;
-	/** Number of pages in the document */
-	int numPages = 0;
-	/** Cursor types */
-	static enum Cursors {DEFAULT, HAND, MOVE};
-	/** Default arrow cursor */
-	final Cursor defaultCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
-	/** Hand cursor */
-	final Cursor handCursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
-	/** Move cursor */
-	final Cursor moveCursor = Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR);
-	/** Current cursor */
-	Cursors currentCursor = Cursors.DEFAULT;
-
-	/**
-	 * Create a new PagePanel.
-	 * @param pdf the PDFFile to display
-	 */
-	public SignaturePanel(PDFFile pdf) {
-		super(new BorderLayout());
-		setDocument(pdf);
-		setPreferredSize(new Dimension(Constants.DEFAULT_MAINWINDOW_WIDTH, Constants.DEFAULT_MAINWINDOW_HEIGHT - Constants.MAINBAR_HEIGHT));
-		setFocusable(true);
-		addMouseListener(this.mouseListener);
-		addMouseMotionListener(this.mouseListener);
-	}
-
-	/**
-	 * Set a new document to be displayed
-	 * @param pdf the PDFFile to be displayed
-	 */
-	public void setDocument(PDFFile pdf) {
-		this.pdf = pdf;
-		this.sigPagePos = null;
-		this.numPages = pdf.getNumPages();
-		showPage(this.numPages);
-	}
-
-	/**
-	 * Set the signature placeholder image
-	 * @param placeholder signature placeholder
-	 * @param width width of the placeholder in page space
-	 * @param height height of the placeholder in page space 
-	 * @param transparency transparency of the signature placeholder (0 - 255)
-	 */
-	public void setSignaturePlaceholder(Image placeholder, int width, int height, int transparency) {
-		this.sigPlaceholder = placeholder;
-		this.sigPageWidth = width;
-		this.sigPageHeight = height;
-		this.sigPlaceholderTransparency = transparency;
-	}
-
-	/**
-	 * Set the color of the signature placeholder border
-	 * @param color new signature placeholder border color
-	 */
-	public void setSignaturePlaceholderBorderColor(Color color) {
-		this.sigPlaceholderBorderColor = color;
-	}
-
-	/**
-	 * Change the currently displayed page
-	 * @param page the number of the page to display
-	 */
-	public void showPage(int page) {
-		this.page = page;
-		showPage(this.pdf.getPage(page));
-	}
-
-	/**
-	 * Add and display a new page at the end of the document
-	 * 
-	 * This page has the same dimensions as the old last page
-	 */
-	public void addNewLastPage() {
-		showPage(this.numPages + 1);
-	}
-
-	/**
-	 * Translate the signature placeholder position
-	 * @param sigXOffset signature placeholder horizontal position offset
-	 * @param sigYOffset signature placeholder vertical position offset
-	 */
-	public void translateSignaturePosition(int sigXOffset, int sigYOffset) {
-		updateSigPos((int) this.sigScreenPos.getX() + sigXOffset, (int) this.sigScreenPos.getY() + sigYOffset);
-	}
-
-	/**
-	 * Set the signature placeholder position
-	 * Call showPage afterwards to update actual position
-	 * @param x the horizontal signature position
-	 * @param y the vertical signature position
-	 */
-	public void setSignaturePosition(float x, float y)
-	{
-		this.sigPagePos = new Point2D.Double(x, y);
-	}
-
-	/**
-	 * Get the current horizontal position of the signature
-	 * @return signature x coordinate
-	 */
-	public float getSignaturePositionX() {
-		if (this.sigPagePos == null)
-			return 0;
-		return Math.max((float) this.sigPagePos.getX(), 0);
-	}
-
-	/**
-	 * Get the current vertical position of the signature
-	 * @return signature y coordinate
-	 */
-	public float getSignaturePositionY() {
-		if (this.sigPagePos == null)
-			return 0;
-		return Math.max((float) this.sigPagePos.getY(), 0);
-	}
-
-	/**
-	 * Stop the generation of any previous page, and draw the new one.
-	 * 
-	 * @param page the PDFPage to draw.
-	 */
-	private synchronized void showPage(PDFPage page) {
-		// stop drawing the previous page
-		if (this.currentPage != null && this.prevSize != null) {
-			this.currentPage.stop(this.prevSize.width, this.prevSize.height, null);
-		}
-
-		boolean newPage = false;
-		// set up the new page
-		if (this.page > this.numPages)
-		{
-			// New last page - use old last page as template
-			this.currentPage = this.pdf.getPage(this.numPages);
-			newPage = true;
-		}
-		else
-			this.currentPage = page;
-
-
-		if (this.currentPage == null) {
-			// no page
-			this.currentImage = null;
-			this.currentXform = null;
-			repaint();
-		} else {
-			// start drawing
-			Dimension sz = getSize();
-			if (sz.width + sz.height == 0) {
-				// no image to draw.
-				return;
-			}
-
-			Dimension pageSize = this.currentPage.getUnstretchedSize(sz.width, sz.height,
-					null);
-
-			// get the new image
-			if (newPage)
-			{
-				this.currentImage = new BufferedImage(pageSize.width, pageSize.height, BufferedImage.TYPE_INT_RGB);
-				Graphics g = this.currentImage.getGraphics();
-				g.setColor(Color.WHITE);
-				g.fillRect(0, 0, pageSize.width, pageSize.height);
-			}
-			else
-				this.currentImage = this.currentPage.getImage(pageSize.width, pageSize.height,
-						null, this);
-
-			// calculate the transform from page to screen space
-			this.currentXform = new AffineTransform(1, 0, 0, -1, 0, pageSize.height);
-			Rectangle2D clip = this.currentPage.getBBox();
-			double scaleX = pageSize.width / clip.getWidth();
-			double scaleY = pageSize.height / clip.getHeight();
-			this.currentXform.scale(scaleX, scaleY);
-			this.currentXform.translate(-clip.getMinX(), -clip.getMinY());
-
-			if (this.sigPagePos != null)
-				this.sigScreenPos = this.currentXform.transform(this.sigPagePos, this.sigScreenPos);
-			this.sigScreenWidth = (int) Math.round(this.sigPageWidth * this.currentXform.getScaleX());
-			this.sigScreenHeight = (int) Math.round(this.sigPageHeight * this.currentXform.getScaleX());
-
-			// invert the transform (screen to page space)
-			try {
-				this.currentXform = this.currentXform.createInverse();
-			} catch (NoninvertibleTransformException nte) {
-				log.error("Error inverting page transform!", nte); //$NON-NLS-1$
-			}
-
-			if (this.sigPagePos == null)
-			{
-				this.sigScreenPos = new Point2D.Double(
-						clamp((int) (pageSize.getWidth() / 2), 0, this.currentImage.getWidth(null) - this.sigScreenWidth),
-						clamp((int) ((pageSize.getHeight() / 4) * 3), 0, this.currentImage.getHeight(null) - this.sigScreenHeight));
-				this.sigPagePos = this.currentXform.transform(this.sigScreenPos, this.sigPagePos);
-			}
-			else
-				updateSigPos((int) this.sigScreenPos.getX(), (int) this.sigScreenPos.getY());
-
-			this.prevSize = pageSize;
-
-			repaint();
-		}
-	}
-
-	/**
-	 * Draw the image.
-	 */
-	@Override
-	public void paint(Graphics g) {
-		Dimension sz = getSize();
-		g.setColor(getBackground());
-		g.fillRect(0, 0, getWidth(), getHeight());
-		if (this.currentImage == null) {
-			g.setColor(Color.black);
-			g.drawString(Messages.getString("error.SignaturePanel.NoPage"), getWidth() / 2 - 30, //$NON-NLS-1$
-					getHeight() / 2);
-			if (this.currentPage != null) {
-				showPage(this.currentPage);
-			}
-		} else {
-			// draw the image
-			int imwid = this.currentImage.getWidth(null);
-			int imhgt = this.currentImage.getHeight(null);
-
-			// draw it centered within the panel
-			this.offX = (sz.width - imwid) / 2;
-			this.offY = (sz.height - imhgt) / 2;
-
-			if ((imwid == sz.width && imhgt <= sz.height)
-					|| (imhgt == sz.height && imwid <= sz.width)) {
-
-				// draw document
-				g.drawImage(this.currentImage, this.offX, this.offY, this);
-
-				// draw signature
-				int sigX = (int) (this.offX + this.sigScreenPos.getX());
-				int sigY = (int) (this.offY + this.sigScreenPos.getY());
-				if (this.sigPlaceholder == null) {
-					g.setColor(Color.red);
-					g.drawRect(sigX, sigY, 100, 40);
-				}
-				else {
-					if (
-							((this.sigScreenWidth != this.prevSigScreenWidth) ||
-							(this.sigScreenHeight != this.prevSigScreenHeight) ||
-							(this.sigPlaceholderTransparency != this.prevSigPlaceholderTransparency)) &&
-							((this.sigScreenWidth != 0) && (this.sigScreenHeight != 0)))
-					{
-						// redraw scaled transparent placeholder
-						this.prevSigScreenWidth = this.sigScreenWidth;
-						this.prevSigScreenHeight = this.sigScreenHeight;
-						this.prevSigPlaceholderTransparency = this.sigPlaceholderTransparency;
-						Image placeholder = this.sigPlaceholder.getScaledInstance(
-								this.sigScreenWidth, this.sigScreenHeight, Image.SCALE_SMOOTH);
-
-						//Make placeholder transparent
-						this.sigPlaceholderScaled = new BufferedImage(this.sigScreenWidth, this.sigScreenHeight, BufferedImage.TYPE_INT_ARGB);
-						Graphics g_phs = this.sigPlaceholderScaled.getGraphics();
-						g_phs.drawImage(placeholder, 0, 0, null);
-
-						// Draw grey "Signature" overlay
-						String overlay = Messages.getString("positioning.signature"); //$NON-NLS-1$
-						// Voodoo to get overlay font scale
-						float scale = (((float) this.sigScreenWidth) / this.sigPlaceholder.getWidth(null)) * 150;
-						g_phs.setFont(getFont().deriveFont(scale));
-						g_phs.setColor(this.sigPlaceholderBorderColor);
-						Rectangle2D overlay_size = g_phs.getFontMetrics().getStringBounds(overlay, g_phs);
-						int width = (int) overlay_size.getWidth();
-						int height = (int) overlay_size.getHeight();
-						int x = this.sigScreenWidth / 2 - width / 2;
-						int y = this.sigScreenHeight / 2 - height / 2 + g_phs.getFontMetrics().getAscent();
-						g_phs.drawString(overlay, x, y);
-
-						g_phs.dispose();
-						int[] phpixels = new int[this.sigScreenWidth * this.sigScreenHeight];
-						phpixels = this.sigPlaceholderScaled.getRGB(0, 0, this.sigScreenWidth, this.sigScreenHeight, phpixels, 0, this.sigScreenWidth);
-						for (int i = 0; i < phpixels.length; ++i) {
-							Color c = new Color(phpixels[i]);
-							c = new Color(c.getRed(), c.getGreen(), c.getBlue(), this.sigPlaceholderTransparency);
-							phpixels[i] = c.getRGB();
-						}
-						this.sigPlaceholderScaled.setRGB(0, 0, this.sigScreenWidth, this.sigScreenHeight, phpixels, 0, this.sigScreenWidth);
-					}
-					g.drawImage(this.sigPlaceholderScaled, sigX, sigY, null);
-					g.setColor(this.sigPlaceholderBorderColor);
-					g.drawRect(sigX, sigY, this.sigScreenWidth-1, this.sigScreenHeight-1);
-				}
-
-			} else {
-				// the image is bogus. try again, or give up.
-				if (this.currentPage != null) {
-					showPage(this.currentPage);
-				}
-				g.setColor(Color.black);
-				g.drawString(Messages.getString("error.SignaturePanel.NoRender"), getWidth() / 2 - 30, //$NON-NLS-1$
-						getHeight() / 2);
-			}
-		}
-	}
-
-	/**
-	 * Handles notification of the fact that some part of the image changed.
-	 * Repaints that portion.
-	 * 
-	 * @return true if more updates are desired.
-	 */
-	@Override
-	public boolean imageUpdate(Image img, int infoflags, int x, int y,
-			int width, int height) {
-		if ((infoflags & (SOMEBITS | ALLBITS)) != 0) {
-			repaint(x + this.offX, y + this.offY, width, height);
-		}
-		return ((infoflags & (ALLBITS | ERROR | ABORT)) == 0);
-	}
-
-	private MouseAdapter mouseListener = new MouseAdapter() {
-
-		private boolean doDrag = false;
-		private int dragXOffset = 0;
-		private int dragYOffset = 0;
-
-		private void updateSigPos(int sigx, int sigy) {
-			SignaturePanel.this.updateSigPos(
-					sigx - SignaturePanel.this.offX,
-					sigy - SignaturePanel.this.offY);
-		}
-
-		/** Handles a mouseMoved event */
-		@Override
-		public void mouseMoved(MouseEvent evt) {
-//			try {
-			boolean onSig = isOnSignature(evt.getX(), evt.getY());
-			setCursor(onSig ? Cursors.HAND : Cursors.DEFAULT);
-//			}catch (NullPointerException e) {
-//				log.debug("Error " +e.getMessage()); //$NON-NLS-1$
-//			}
-		}
-
-		/** Handles a mousePressed event */
-		@Override
-		public void mousePressed(MouseEvent evt) {
-			if (evt.getButton() == MouseEvent.BUTTON1)
-			{
-				this.doDrag = true;
-				if (isOnSignature(evt.getX(), evt.getY())) {
-					this.dragXOffset = (int)
-							(SignaturePanel.this.sigScreenPos.getX() -
-							(evt.getX() - SignaturePanel.this.offX));
-					this.dragYOffset = (int)
-							(SignaturePanel.this.sigScreenPos.getY() -
-							(evt.getY() - SignaturePanel.this.offY));
-				}
-				else {
-					this.dragXOffset = 0;
-					this.dragYOffset = 0;
-				}
-				updateSigPos(evt.getX() + this.dragXOffset, evt.getY() + this.dragYOffset);
-				setCursor(Cursors.MOVE);
-			}
-		}
-
-		/** Handles a mouseReleased event */
-		@Override
-		public void mouseReleased(MouseEvent evt) {
-			this.doDrag = false;
-			boolean onSig = isOnSignature(evt.getX(), evt.getY());
-			setCursor(onSig ? Cursors.HAND : Cursors.DEFAULT);
-		}
-
-		/**
-		 * Handles a mouseDragged event.
-		 */
-		@Override
-		public void mouseDragged(MouseEvent evt) {
-			if (this.doDrag)
-				updateSigPos(evt.getX() + this.dragXOffset, evt.getY() + this.dragYOffset);
-		}
-	};
-
-	/**
-	 * Sets the mouse cursor
-	 * @param cursor cursor to set
-	 */
-	void setCursor(Cursors cursor)
-	{
-		if (this.currentCursor == cursor)
-			return;
-		this.currentCursor = cursor;
-		Cursor cur = null;
-		switch (cursor) {
-			case DEFAULT:
-				cur = this.defaultCursor;
-				break;
-			case HAND:
-				cur = this.handCursor;
-				break;
-			case MOVE:
-				cur = this.moveCursor;
-				break;
-		}
-		this.getParent().setCursor(cur);
-	}
-
-	/**
-	 * Check whether given point is on signature placeholder
-	 * @param x x coordinate
-	 * @param y y coordinate
-	 * @return true if given point is on signature placeholder
-	 */
-	boolean isOnSignature(int x, int y)
-	{
-		Rectangle2D sig = new Rectangle2D.Double(
-				this.sigScreenPos.getX() + this.offX,
-				this.sigScreenPos.getY() + this.offY,
-				this.sigScreenWidth,
-				this.sigScreenHeight);
-		Point2D pos = new Point2D.Double(x, y);
-		return (sig.contains(pos));
-	}
-
-	/**
-	 * Update the signature placeholder position
-	 * @param sigx X position on the document (screen coordinates)
-	 * @param sigy Y position on the document (screen coordinates)
-	 */
-	void updateSigPos(int sigx, int sigy) {
-		if (this.currentImage == null)
-			return;
-		sigx = clamp(sigx, 0, this.currentImage.getWidth(null) - this.sigScreenWidth);
-		sigy = clamp(sigy, 0, this.currentImage.getHeight(null) - this.sigScreenHeight);
-		this.sigScreenPos = new Point2D.Double(sigx, sigy);
-		this.sigPagePos = this.currentXform.transform(this.sigScreenPos, this.sigPagePos);
-		repaint();
-	}
-
-	/**
-	 * Clamp x to be within [min-max]
-	 * @param x int to clamp
-	 * @param min minimum value
-	 * @param max maximum value
-	 * @return clamped x
-	 */
-	static int clamp(int x, int min, int max)
-	{
-		if (x < min)
-			x = min;
-		else if (x > max)
-			x = max;
-		return x;
-	}
-}
+/*

+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria

+ *

+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by

+ * the European Commission - subsequent versions of the EUPL (the "Licence");

+ * You may not use this work except in compliance with the Licence.

+ * You may obtain a copy of the Licence at:

+ * http://joinup.ec.europa.eu/software/page/eupl

+ *

+ * Unless required by applicable law or agreed to in writing, software

+ * distributed under the Licence is distributed on an "AS IS" basis,

+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+ * See the Licence for the specific language governing permissions and

+ * limitations under the Licence.

+ */

+package at.asit.pdfover.gui.composites;

+

+// Imports

+import java.awt.BorderLayout;

+import java.awt.Color;

+import java.awt.Cursor;

+import java.awt.Dimension;

+import java.awt.Graphics;

+import java.awt.Image;

+import java.awt.event.MouseAdapter;

+import java.awt.event.MouseEvent;

+import java.awt.geom.AffineTransform;

+import java.awt.geom.NoninvertibleTransformException;

+import java.awt.geom.Point2D;

+import java.awt.geom.Rectangle2D;

+import java.awt.image.BufferedImage;

+

+import javax.swing.JPanel;

+

+import org.slf4j.Logger;

+import org.slf4j.LoggerFactory;

+

+import at.asit.pdfover.gui.Constants;

+import at.asit.pdfover.gui.utils.Messages;

+

+import com.sun.pdfview.PDFFile;

+import com.sun.pdfview.PDFPage;

+

+/**

+ * 

+ */

+public class SignaturePanel extends JPanel {

+	/**

+	 * SLF4J Logger instance

+	 **/

+	private static final Logger log = LoggerFactory

+			.getLogger(SignaturePanel.class);

+

+	/** Default serial version ID */

+	private static final long serialVersionUID = 1L;

+

+	/** The PDF file being displayed */

+	private PDFFile pdf = null;

+	/** The image of the rendered PDF page being displayed */

+	Image currentImage = null;

+	/** The current PDFPage that was rendered into currentImage */

+	private PDFPage currentPage = null;

+	/** The current transform from screen to page space */

+	AffineTransform currentXform = null;

+	/** The horizontal offset of the image from the left edge of the panel */

+	int offX = 0;

+	/** The vertical offset of the image from the top of the panel */

+	int offY = 0;

+	/** The size of the image */

+	private Dimension prevSize = null;

+	/** The position of the signature, in page space */

+	Point2D sigPagePos = null;

+	/** The position of the signature, in screen space */

+	Point2D sigScreenPos = null;

+	/** The signature placeholder image */

+	private Image sigPlaceholder = null;

+	/** Current scaled signature placeholder image */

+	BufferedImage sigPlaceholderScaled = null;

+	/** Transparency of the signature placeholder (0-255) */

+	private int sigPlaceholderTransparency = Constants.DEFAULT_SIGNATURE_PLACEHOLDER_TRANSPARENCY;

+	/** Previous Transparency of the signature placeholder */

+	private int prevSigPlaceholderTransparency = 0;

+	/** Width of the signature placeholder in page space */

+	private int sigPageWidth = 0;

+	/** Height of the signature placeholder in page space */

+	private int sigPageHeight = 0;

+	/** Width of the signature placeholder in screen space */

+	int sigScreenWidth = 0;

+	/** Height of the signature placeholder in screen space */

+	int sigScreenHeight = 0;

+	/** Previous Width of the signature placeholder in screen space */

+	int prevSigScreenWidth = 0;

+	/** Previous Height of the signature placeholder in screen space */

+	int prevSigScreenHeight = 0;

+	/** Color of the signature placeholder border */

+	private Color sigPlaceholderBorderColor = Color.BLUE;

+	/** Current page */

+	int page = 0;

+	/** Number of pages in the document */

+	int numPages = 0;

+	/** Cursor types */

+	static enum Cursors {DEFAULT, HAND, MOVE};

+	/** Default arrow cursor */

+	final Cursor defaultCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);

+	/** Hand cursor */

+	final Cursor handCursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);

+	/** Move cursor */

+	final Cursor moveCursor = Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR);

+	/** Current cursor */

+	Cursors currentCursor = Cursors.DEFAULT;

+

+	/**

+	 * Create a new PagePanel.

+	 * @param pdf the PDFFile to display

+	 */

+	public SignaturePanel(PDFFile pdf) {

+		super(new BorderLayout());

+		setDocument(pdf);

+		setPreferredSize(new Dimension(Constants.DEFAULT_MAINWINDOW_WIDTH, Constants.DEFAULT_MAINWINDOW_HEIGHT - Constants.MAINBAR_HEIGHT));

+		setFocusable(true);

+		addMouseListener(this.mouseListener);

+		addMouseMotionListener(this.mouseListener);

+	}

+

+	/**

+	 * Set a new document to be displayed

+	 * @param pdf the PDFFile to be displayed

+	 */

+	public void setDocument(PDFFile pdf) {

+		this.pdf = pdf;

+		this.sigPagePos = null;

+		this.numPages = pdf.getNumPages();

+		showPage(this.numPages);

+	}

+

+	/**

+	 * Set the signature placeholder image

+	 * @param placeholder signature placeholder

+	 * @param width width of the placeholder in page space

+	 * @param height height of the placeholder in page space 

+	 * @param transparency transparency of the signature placeholder (0 - 255)

+	 */

+	public void setSignaturePlaceholder(Image placeholder, int width, int height, int transparency) {

+		this.sigPlaceholder = placeholder;

+		this.sigPageWidth = width;

+		this.sigPageHeight = height;

+		this.sigPlaceholderTransparency = transparency;

+	}

+

+	/**

+	 * Set the color of the signature placeholder border

+	 * @param color new signature placeholder border color

+	 */

+	public void setSignaturePlaceholderBorderColor(Color color) {

+		this.sigPlaceholderBorderColor = color;

+	}

+

+	/**

+	 * Change the currently displayed page

+	 * @param page the number of the page to display

+	 */

+	public void showPage(int page) {

+		this.page = page;

+		showPage(this.pdf.getPage(page));

+	}

+

+	/**

+	 * Add and display a new page at the end of the document

+	 * 

+	 * This page has the same dimensions as the old last page

+	 */

+	public void addNewLastPage() {

+		showPage(this.numPages + 1);

+	}

+

+	/**

+	 * Translate the signature placeholder position

+	 * @param sigXOffset signature placeholder horizontal position offset

+	 * @param sigYOffset signature placeholder vertical position offset

+	 */

+	public void translateSignaturePosition(int sigXOffset, int sigYOffset) {

+		updateSigPos((int) this.sigScreenPos.getX() + sigXOffset, (int) this.sigScreenPos.getY() + sigYOffset);

+	}

+

+	/**

+	 * Set the signature placeholder position

+	 * Call showPage afterwards to update actual position

+	 * @param x the horizontal signature position

+	 * @param y the vertical signature position

+	 */

+	public void setSignaturePosition(float x, float y)

+	{

+		this.sigPagePos = new Point2D.Double(x, y);

+	}

+

+	/**

+	 * Get the current horizontal position of the signature

+	 * @return signature x coordinate

+	 */

+	public float getSignaturePositionX() {

+		if (this.sigPagePos == null)

+			return 0;

+		return Math.max((float) this.sigPagePos.getX(), 0);

+	}

+

+	/**

+	 * Get the current vertical position of the signature

+	 * @return signature y coordinate

+	 */

+	public float getSignaturePositionY() {

+		if (this.sigPagePos == null)

+			return 0;

+		return Math.max((float) this.sigPagePos.getY(), 0);

+	}

+

+	/**

+	 * Stop the generation of any previous page, and draw the new one.

+	 * 

+	 * @param page the PDFPage to draw.

+	 */

+	private synchronized void showPage(PDFPage page) {

+		// stop drawing the previous page

+		if (this.currentPage != null && this.prevSize != null) {

+			this.currentPage.stop(this.prevSize.width, this.prevSize.height, null);

+		}

+

+		boolean newPage = false;

+		// set up the new page

+		if (this.page > this.numPages)

+		{

+			// New last page - use old last page as template

+			this.currentPage = this.pdf.getPage(this.numPages);

+			newPage = true;

+		}

+		else

+			this.currentPage = page;

+

+

+		if (this.currentPage == null) {

+			// no page

+			this.currentImage = null;

+			this.currentXform = null;

+			repaint();

+		} else {

+			// start drawing

+			Dimension sz = getSize();

+			if (sz.width + sz.height == 0) {

+				// no image to draw.

+				return;

+			}

+

+			Dimension pageSize = this.currentPage.getUnstretchedSize(sz.width, sz.height,

+					null);

+

+			// get the new image

+			if (newPage)

+			{

+				this.currentImage = new BufferedImage(pageSize.width, pageSize.height, BufferedImage.TYPE_INT_RGB);

+				Graphics g = this.currentImage.getGraphics();

+				g.setColor(Color.WHITE);

+				g.fillRect(0, 0, pageSize.width, pageSize.height);

+			}

+			else

+				this.currentImage = this.currentPage.getImage(pageSize.width, pageSize.height,

+						null, this);

+

+			// calculate the transform from page to screen space

+			this.currentXform = new AffineTransform(1, 0, 0, -1, 0, pageSize.height);

+			Rectangle2D clip = this.currentPage.getBBox();

+			double scaleX = pageSize.width / clip.getWidth();

+			double scaleY = pageSize.height / clip.getHeight();

+			this.currentXform.scale(scaleX, scaleY);

+			this.currentXform.translate(-clip.getMinX(), -clip.getMinY());

+

+			if (this.sigPagePos != null)

+				this.sigScreenPos = this.currentXform.transform(this.sigPagePos, this.sigScreenPos);

+			this.sigScreenWidth = (int) Math.round(this.sigPageWidth * this.currentXform.getScaleX());

+			this.sigScreenHeight = (int) Math.round(this.sigPageHeight * this.currentXform.getScaleX());

+

+			// invert the transform (screen to page space)

+			try {

+				this.currentXform = this.currentXform.createInverse();

+			} catch (NoninvertibleTransformException nte) {

+				log.error("Error inverting page transform!", nte); //$NON-NLS-1$

+			}

+

+			if (this.sigPagePos == null)

+			{

+				this.sigScreenPos = new Point2D.Double(

+						clamp((int) (pageSize.getWidth() / 2), 0, this.currentImage.getWidth(null) - this.sigScreenWidth),

+						clamp((int) ((pageSize.getHeight() / 4) * 3), 0, this.currentImage.getHeight(null) - this.sigScreenHeight));

+				this.sigPagePos = this.currentXform.transform(this.sigScreenPos, this.sigPagePos);

+			}

+			else

+				updateSigPos((int) this.sigScreenPos.getX(), (int) this.sigScreenPos.getY());

+

+			this.prevSize = pageSize;

+

+			repaint();

+		}

+	}

+

+	/**

+	 * Draw the image.

+	 */

+	@Override

+	public void paint(Graphics g) {

+		Dimension sz = getSize();

+		g.setColor(getBackground());

+		g.fillRect(0, 0, getWidth(), getHeight());

+		if (this.currentImage == null) {

+			g.setColor(Color.black);

+			g.drawString(Messages.getString("error.SignaturePanel.NoPage"), getWidth() / 2 - 30, //$NON-NLS-1$

+					getHeight() / 2);

+			if (this.currentPage != null) {

+				showPage(this.currentPage);

+			}

+		} else {

+			// draw the image

+			int imwid = this.currentImage.getWidth(null);

+			int imhgt = this.currentImage.getHeight(null);

+

+			// draw it centered within the panel

+			this.offX = (sz.width - imwid) / 2;

+			this.offY = (sz.height - imhgt) / 2;

+

+			if ((imwid == sz.width && imhgt <= sz.height)

+					|| (imhgt == sz.height && imwid <= sz.width)) {

+

+				// draw document

+				g.drawImage(this.currentImage, this.offX, this.offY, this);

+

+				// draw signature

+				int sigX = (int) (this.offX + this.sigScreenPos.getX());

+				int sigY = (int) (this.offY + this.sigScreenPos.getY());

+				if (this.sigPlaceholder == null) {

+					g.setColor(Color.red);

+					g.drawRect(sigX, sigY, 100, 40);

+				}

+				else {

+					if (

+							((this.sigScreenWidth != this.prevSigScreenWidth) ||

+							(this.sigScreenHeight != this.prevSigScreenHeight) ||

+							(this.sigPlaceholderTransparency != this.prevSigPlaceholderTransparency)) &&

+							((this.sigScreenWidth != 0) && (this.sigScreenHeight != 0)))

+					{

+						// redraw scaled transparent placeholder

+						this.prevSigScreenWidth = this.sigScreenWidth;

+						this.prevSigScreenHeight = this.sigScreenHeight;

+						this.prevSigPlaceholderTransparency = this.sigPlaceholderTransparency;

+						Image placeholder = this.sigPlaceholder.getScaledInstance(

+								this.sigScreenWidth, this.sigScreenHeight, Image.SCALE_SMOOTH);

+

+						//Make placeholder transparent

+						this.sigPlaceholderScaled = new BufferedImage(this.sigScreenWidth, this.sigScreenHeight, BufferedImage.TYPE_INT_ARGB);

+						Graphics g_phs = this.sigPlaceholderScaled.getGraphics();

+						g_phs.drawImage(placeholder, 0, 0, null);

+

+						// Draw grey "Signature" overlay

+						String overlay = Messages.getString("positioning.signature"); //$NON-NLS-1$

+						// Voodoo to get overlay font scale

+						float scale = (((float) this.sigScreenWidth) / this.sigPlaceholder.getWidth(null)) * 150;

+						g_phs.setFont(getFont().deriveFont(scale));

+						g_phs.setColor(this.sigPlaceholderBorderColor);

+						Rectangle2D overlay_size = g_phs.getFontMetrics().getStringBounds(overlay, g_phs);

+						int width = (int) overlay_size.getWidth();

+						int height = (int) overlay_size.getHeight();

+						int x = this.sigScreenWidth / 2 - width / 2;

+						int y = this.sigScreenHeight / 2 - height / 2 + g_phs.getFontMetrics().getAscent();

+						g_phs.drawString(overlay, x, y);

+

+						g_phs.dispose();

+						int[] phpixels = new int[this.sigScreenWidth * this.sigScreenHeight];

+						phpixels = this.sigPlaceholderScaled.getRGB(0, 0, this.sigScreenWidth, this.sigScreenHeight, phpixels, 0, this.sigScreenWidth);

+						for (int i = 0; i < phpixels.length; ++i) {

+							Color c = new Color(phpixels[i]);

+							c = new Color(c.getRed(), c.getGreen(), c.getBlue(), this.sigPlaceholderTransparency);

+							phpixels[i] = c.getRGB();

+						}

+						this.sigPlaceholderScaled.setRGB(0, 0, this.sigScreenWidth, this.sigScreenHeight, phpixels, 0, this.sigScreenWidth);

+					}

+					g.drawImage(this.sigPlaceholderScaled, sigX, sigY, null);

+					g.setColor(this.sigPlaceholderBorderColor);

+					g.drawRect(sigX, sigY, this.sigScreenWidth-1, this.sigScreenHeight-1);

+				}

+

+			} else {

+				// the image is bogus. try again, or give up.

+				if (this.currentPage != null) {

+					showPage(this.currentPage);

+				}

+				g.setColor(Color.black);

+				g.drawString(Messages.getString("error.SignaturePanel.NoRender"), getWidth() / 2 - 30, //$NON-NLS-1$

+						getHeight() / 2);

+			}

+		}

+	}

+

+	/**

+	 * Handles notification of the fact that some part of the image changed.

+	 * Repaints that portion.

+	 * 

+	 * @return true if more updates are desired.

+	 */

+	@Override

+	public boolean imageUpdate(Image img, int infoflags, int x, int y,

+			int width, int height) {

+		if ((infoflags & (SOMEBITS | ALLBITS)) != 0) {

+			repaint(x + this.offX, y + this.offY, width, height);

+		}

+		return ((infoflags & (ALLBITS | ERROR | ABORT)) == 0);

+	}

+

+	private MouseAdapter mouseListener = new MouseAdapter() {

+

+		private boolean doDrag = false;

+		private int dragXOffset = 0;

+		private int dragYOffset = 0;

+

+		private void updateSigPos(int sigx, int sigy) {

+			SignaturePanel.this.updateSigPos(

+					sigx - SignaturePanel.this.offX,

+					sigy - SignaturePanel.this.offY);

+		}

+

+		/** Handles a mouseMoved event */

+		@Override

+		public void mouseMoved(MouseEvent evt) {

+			try {

+				boolean onSig = isOnSignature(evt.getX(), evt.getY());

+				setCursor(onSig ? Cursors.HAND : Cursors.DEFAULT);

+			} catch (NullPointerException e) {

+				// do nothing

+			}

+		}

+

+		/** Handles a mousePressed event */

+		@Override

+		public void mousePressed(MouseEvent evt) {

+			if (evt.getButton() == MouseEvent.BUTTON1)

+			{

+				this.doDrag = true;

+				if (isOnSignature(evt.getX(), evt.getY())) {

+					this.dragXOffset = (int)

+							(SignaturePanel.this.sigScreenPos.getX() -

+							(evt.getX() - SignaturePanel.this.offX));

+					this.dragYOffset = (int)

+							(SignaturePanel.this.sigScreenPos.getY() -

+							(evt.getY() - SignaturePanel.this.offY));

+				}

+				else {

+					this.dragXOffset = 0;

+					this.dragYOffset = 0;

+				}

+				updateSigPos(evt.getX() + this.dragXOffset, evt.getY() + this.dragYOffset);

+				setCursor(Cursors.MOVE);

+			}

+		}

+

+		/** Handles a mouseReleased event */

+		@Override

+		public void mouseReleased(MouseEvent evt) {

+			this.doDrag = false;

+			boolean onSig = isOnSignature(evt.getX(), evt.getY());

+			setCursor(onSig ? Cursors.HAND : Cursors.DEFAULT);

+		}

+

+		/**

+		 * Handles a mouseDragged event.

+		 */

+		@Override

+		public void mouseDragged(MouseEvent evt) {

+			if (this.doDrag)

+				updateSigPos(evt.getX() + this.dragXOffset, evt.getY() + this.dragYOffset);

+		}

+	};

+

+	/**

+	 * Sets the mouse cursor

+	 * @param cursor cursor to set

+	 */

+	void setCursor(Cursors cursor)

+	{

+		if (this.currentCursor == cursor)

+			return;

+		this.currentCursor = cursor;

+		Cursor cur = null;

+		switch (cursor) {

+			case DEFAULT:

+				cur = this.defaultCursor;

+				break;

+			case HAND:

+				cur = this.handCursor;

+				break;

+			case MOVE:

+				cur = this.moveCursor;

+				break;

+		}

+		this.getParent().setCursor(cur);

+	}

+

+	/**

+	 * Check whether given point is on signature placeholder

+	 * @param x x coordinate

+	 * @param y y coordinate

+	 * @return true if given point is on signature placeholder

+	 */

+	boolean isOnSignature(int x, int y)

+	{

+		Rectangle2D sig = new Rectangle2D.Double(

+				this.sigScreenPos.getX() + this.offX,

+				this.sigScreenPos.getY() + this.offY,

+				this.sigScreenWidth,

+				this.sigScreenHeight);

+		Point2D pos = new Point2D.Double(x, y);

+		return (sig.contains(pos));

+	}

+

+	/**

+	 * Update the signature placeholder position

+	 * @param sigx X position on the document (screen coordinates)

+	 * @param sigy Y position on the document (screen coordinates)

+	 */

+	void updateSigPos(int sigx, int sigy) {

+		if (this.currentImage == null)

+			return;

+		sigx = clamp(sigx, 0, this.currentImage.getWidth(null) - this.sigScreenWidth);

+		sigy = clamp(sigy, 0, this.currentImage.getHeight(null) - this.sigScreenHeight);

+		this.sigScreenPos = new Point2D.Double(sigx, sigy);

+		this.sigPagePos = this.currentXform.transform(this.sigScreenPos, this.sigPagePos);

+		repaint();

+	}

+

+	/**

+	 * Clamp x to be within [min-max]

+	 * @param x int to clamp

+	 * @param min minimum value

+	 * @param max maximum value

+	 * @return clamped x

+	 */

+	static int clamp(int x, int min, int max)

+	{

+		if (x < min)

+			x = min;

+		else if (x > max)

+			x = max;

+		return x;

+	}

+}