Imagepanel

StatusBar = new JLabel(" "); statusBar.setBorder(BorderFactory.createLineBorder(Color.BLACK)); panel = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0)); panel.setBackground(backgroundColor); panel.setPreferredSize(new Dimension(width, height)); imagePanel = new ImagePanel(image); imagePanel.setBackground(backgroundColor); panel.add(imagePanel); // listen to mouse movement mouseListener = new DPMouseListener(); panel.addMouseMotionListener(mouseListener); // main window frame frame = new JFrame(TITLE); // frame.setResizable(false); windowListener = new DPWindowListener(); frame.addWindowListener(windowListener); // JPanel center = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0)); JScrollPane center = new JScrollPane(panel); // center.add(panel); frame.getContentPane().add(center); frame.getContentPane().add(statusBar, "South"); frame.setBackground(Color.DARK_GRAY); // menu bar actionListener = new DPActionListener(); setupMenuBar(); frame.pack(); center(frame); frame.setVisible(true); if (!shouldSave()) { toFront(frame); } // repaint timer so that the screen will update createTime = System.currentTimeMillis(); timer = new Timer(DELAY, actionListener); timer.start(); } else if (shouldSave()) { // headless mode; just set a hook on shutdown to save the image callingClassName = getCallingClassName(); try { Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() { // run on shutdown to save the image public void run() { if (DEBUG) System.out.println("DrawingPanel.run(): Running shutdown hook"); if (DEBUG) System.out.println("DrawingPanel shutdown hook: instances=" + instances); try { String filename = System.getProperty(SAVE_PROPERTY); if (filename == null) { filename = callingClassName + ".png"; } if (isAnimated()) { saveAnimated(filename); } else { save(filename); } } catch (SecurityException e) { System.err.println("Security error while saving image: " + e); } catch (IOException e) { System.err.println("Error saving image: " + e); } } })); } catch (Exception e) { if (DEBUG) System.out.println("DrawingPanel(): unable to add shutdown hook: " + e); } } } /** * Constructs a drawing panel that displays the image from the given file enclosed in a window. * The panel will be sized exactly to fit the image inside it. * @param imageFile the image file to load * @throws RuntimeException if the image file is not found */ public DrawingPanel(File imageFile) { this(imageFile.toString()); } /** * Constructs a drawing panel that displays the image from the given file name enclosed in a window. * The panel will be sized exactly to fit the image inside it. * @param imageFileName the file name/path of the image file to load * @throws RuntimeException if the image file is not found */ public DrawingPanel(String imageFileName) { this(); Image image = loadImage(imageFileName); setSize(image.getWidth(this), image.getHeight(this)); getGraphics().drawImage(image, 0, 0, this); } /** * Adds the given event listener to respond to key events on this panel. * @param listener the key event listener to attach */ public void addKeyListener(KeyListener listener) { ensureNotNull("listener", listener); frame.addKeyListener(listener); panel.setFocusable(false); frame.requestFocusInWindow(); frame.requestFocus(); } /** * Adds the given event listener to respond to mouse events on this panel. * @param listener the mouse event listener to attach */ public void addMouseListener(MouseListener listener) { ensureNotNull("listener", listener); panel.addMouseListener(listener); if (listener instanceof MouseMotionListener) { panel.addMouseMotionListener((MouseMotionListener) listener); } } /** * Adds the given event listener to respond to mouse events on this panel. */// public void addMouseListener(MouseMotionListener listener) {// panel.addMouseMotionListener(listener);// if (listener instanceof MouseListener) {// panel.addMouseListener((MouseListener) listener);// }// } // /**// * Adds the given event listener to respond to mouse events on this panel.// */// public void addMouseListener(MouseInputListener listener) {// addMouseListener((MouseListener) listener);// } /* * Whether the panel should automatically switch to animated mode

This method, the client must call getGraphics() again * to get the new graphics context of the newly enlarged image buffer. * @param width width, in pixels * @param height height, in pixels * @throws IllegalArgumentException if width/height is negative or exceeds MAX_SIZE */ public void setSize(int width, int height) { ensureInRange("width", width, 0, MAX_SIZE); ensureInRange("height", height, 0, MAX_SIZE); // replace the image buffer for drawing BufferedImage newImage = new BufferedImage(width, height, image.getType()); if (imagePanel != null) { imagePanel.setImage(newImage); } newImage.getGraphics().drawImage(image, 0, 0, imagePanel == null ? new JPanel() : imagePanel); this.width = width; this.height = height; image = newImage; g2 = (Graphics2D) newImage.getGraphics(); g2.setColor(Color.BLACK); if (antialias) { g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); } zoom(currentZoom); if (isGraphical()) { frame.pack(); } } /* * Sets the text that will appear in the drawing panel's bottom status bar. */ private void setStatusBarText(String text) { if (currentZoom != 1) { text += " (current zoom: " + currentZoom + "x" + ")"; } statusBar.setText(text); } /* * Initializes the drawing panel's menu bar items. */ private void setupMenuBar() { // abort compare if we're running as an applet or in a secure environment // boolean secure = (System.getSecurityManager() != null); // for now, assume non-secure mode since DrawingPanel applet usage is minimal final boolean secure = false; JMenuItem saveAs = new JMenuItem("Save As...", 'A'); saveAs.addActionListener(actionListener); saveAs.setAccelerator(KeyStroke.getKeyStroke("ctrl S")); saveAs.setEnabled(!secure); JMenuItem saveAnimated = new JMenuItem("Save Animated GIF...", 'G'); saveAnimated.addActionListener(actionListener); saveAnimated.setAccelerator(KeyStroke.getKeyStroke("ctrl A")); saveAnimated.setEnabled(!secure); JMenuItem compare = new JMenuItem("Compare to File...", 'C'); compare.addActionListener(actionListener); compare.setEnabled(!secure); JMenuItem compareURL = new JMenuItem("Compare to Web File...", 'U'); compareURL.addActionListener(actionListener); compareURL.setAccelerator(KeyStroke.getKeyStroke("ctrl U")); compareURL.setEnabled(!secure); JMenuItem zoomIn = new JMenuItem("Zoom In", 'I'); zoomIn.addActionListener(actionListener); zoomIn.setAccelerator(KeyStroke.getKeyStroke("ctrl EQUALS")); JMenuItem zoomOut = new JMenuItem("Zoom Out", 'O'); zoomOut.addActionListener(actionListener); zoomOut.setAccelerator(KeyStroke.getKeyStroke("ctrl MINUS")); JMenuItem zoomNormal = new JMenuItem("Zoom Normal (100%)", 'N'); zoomNormal.addActionListener(actionListener); zoomNormal.setAccelerator(KeyStroke.getKeyStroke("ctrl 0")); JCheckBoxMenuItem gridLinesItem = new JCheckBoxMenuItem("Grid Lines"); gridLinesItem.setMnemonic('G'); gridLinesItem.setSelected(gridLines); gridLinesItem.addActionListener(actionListener); gridLinesItem.setAccelerator(KeyStroke.getKeyStroke("ctrl G")); JMenuItem exit = new JMenuItem("Exit", 'x'); exit.addActionListener(actionListener); JMenuItem about = new JMenuItem("About...", 'A'); about.addActionListener(actionListener); JMenu file = new JMenu("File"); file.setMnemonic('F'); file.add(compareURL); file.add(compare); file.addSeparator(); file.add(saveAs); file.add(saveAnimated); file.addSeparator(); file.add(exit); JMenu view = new JMenu("View"); view.setMnemonic('V'); view.add(zoomIn); view.add(zoomOut); view.add(zoomNormal); view.addSeparator(); view.add(gridLinesItem); JMenu help = new JMenu("Help"); help.setMnemonic('H'); help.add(about); JMenuBar bar = new JMenuBar(); bar.add(file); bar.add(view); bar.add(help); frame.setJMenuBar(bar); } /** * Show or hide the drawing panel on the screen. * @param visible true to show, false to hide */ public void setVisible(boolean visible) { if (isGraphical()) { frame.setVisible(visible); } } /** * Sets the drawing panel's width in pixels to the given value. * After calling this method, the client must call getGraphics() again * to get the new graphics context of the newly enlarged image buffer. * @param width width, in pixels * @throws IllegalArgumentException if height is negative or exceeds MAX_SIZE */ public void setWidth(int width) { ensureInRange("width", width, 0, MAX_SIZE); setSize(width, getHeight()); } /* * Returns whether the user wants to perform a 'diff' comparison of their * drawing panel with a given expected output image. */ private boolean shouldDiff() { return hasProperty(DIFF_PROPERTY); } /* * Returns whether the user wants to save the drawing panel contents to * a file

20, 30, 40); } else { System.setProperty(AWT_HEADLESS_PROPERTY, "false"); System.setProperty(HEADLESS_PROPERTY, "false"); } } } /** * Sets the file to be used when saving graphical output for all DrawingPanels. * @param file the file to use as default save file */ public static void setSaveFile(File file) { setSaveFileName(file.toString()); } /** * Sets the filename to be used when saving graphical output for all DrawingPanels. * @param filename the name/path of the file to use as default save file */ public static void setSaveFileName(String filename) { try { System.setProperty(SAVE_PROPERTY, filename); } catch (SecurityException e) { // empty } saveFileName = filename; } /** * Returns an RGB integer made from the given red, green, and blue components * from 0-255. The returned integer is suitable for use with various RGB * integer methods in this class such as setPixel. * @param r red component from 0-255 (bits 8-15) * @param g green component from 0-255 (bits 16-23) * @param b blue component from 0-255 (bits 24-31) * @return RGB integer with full 255 for alpha and r-g-b in bits 8-31 * @throws IllegalArgumentException if r, g, or b is not in 0-255 range */ public static int toRgbInteger(int r, int g, int b) { return toRgbInteger(/* alpha */ 255, r, g, b); } /** * Returns an RGB integer made from the given alpha, red, green, and blue components * from 0-255. The returned integer is suitable for use with various RGB * integer methods in this class such as setPixel. * @param alpha alpha (transparency) component from 0-255 (bits 0-7) * @param r red component from 0-255 (bits 8-15) * @param g green component from 0-255 (bits 16-23) * @param b blue component from 0-255 (bits 24-31) * @return RGB integer with the given four components * @throws IllegalArgumentException if alpha, r, g, or b is not in 0-255 range */ public static int toRgbInteger(int alpha, int r, int g, int b) { ensureInRange("alpha", alpha, 0, 255); ensureInRange("red", r, 0, 255); ensureInRange("green", g, 0, 255); ensureInRange("blue", b, 0, 255); return ((alpha & 0x000000ff) = 0; } catch (SecurityException e) { // running as an applet, or something return false; } } // fields private ActionListener actionListener; private List frames; // stores frames of animation to save private boolean animated = false; // changes to true if sleep() is called private boolean antialias = isAntiAliasDefault(); // true to smooth corners of shapes private boolean gridLines = false; // grid lines every 10px on screen private boolean hasBeenSaved = false; // set true once saved to file (to avoid re-saving same panel) private BufferedImage image; // remembers drawing commands private Color backgroundColor = Color.WHITE; private Gif89Encoder encoder; // for saving animations private Graphics g3; // new field to support DebuggingGraphics private Graphics2D g2; // graphics context for painting private ImagePanel imagePanel; // real drawing surface private int currentZoom = 1; // panel's zoom factor for drawing private int gridLinesPxGap = GRID_LINES_PX_GAP_DEFAULT; // px between grid lines private int initialPixel; // initial value in