Java tutorial
/* * JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------------ * SortableTable.java * ------------------ * (C) Copyright 2000-2004, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: SortableTable.java,v 1.5 2005/11/16 15:58:41 taqua Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.*; * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); * */ import java.awt.Color; import java.awt.Component; import java.awt.Graphics; import java.awt.Insets; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JLabel; import javax.swing.JTable; import javax.swing.SwingConstants; import javax.swing.UIManager; import javax.swing.border.Border; import javax.swing.table.AbstractTableModel; import javax.swing.table.JTableHeader; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumnModel; /** * A simple extension of JTable that supports the use of a SortableTableModel. * * @author David Gilbert */ public class SortableTable extends JTable { /** A listener for sorting. */ private SortableTableHeaderListener headerListener; /** * Standard constructor - builds a table for the specified model. * * @param model the data. */ public SortableTable(final SortableTableModel model) { super(model); final SortButtonRenderer renderer = new SortButtonRenderer(); final TableColumnModel cm = getColumnModel(); for (int i = 0; i < cm.getColumnCount(); i++) { cm.getColumn(i).setHeaderRenderer(renderer); } final JTableHeader header = getTableHeader(); this.headerListener = new SortableTableHeaderListener(model, renderer); header.addMouseListener(this.headerListener); header.addMouseMotionListener(this.headerListener); model.sortByColumn(0, true); } /** * Changes the model for the table. Takes care of updating the header listener at the * same time. * * @param model the table model. * */ public void setSortableModel(final SortableTableModel model) { super.setModel(model); this.headerListener.setTableModel(model); final SortButtonRenderer renderer = new SortButtonRenderer(); final TableColumnModel cm = getColumnModel(); for (int i = 0; i < cm.getColumnCount(); i++) { cm.getColumn(i).setHeaderRenderer(renderer); } model.sortByColumn(0, true); } } /* * JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * -------------------------------- * SortableTableHeaderListener.java * -------------------------------- * (C) Copyright 2000-2004, by Nabuo Tamemasa and Contributors. * * Original Author: Nabuo Tamemasa; * Contributor(s): David Gilbert (for Object Refinery Limited); * * $Id: SortableTableHeaderListener.java,v 1.5 2007/11/02 17:50:36 taqua Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.*; * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); * */ /** * Captures mouse clicks on a table header, with the intention of triggering a sort. Adapted from * code by Nabuo Tamemasa posted on http://www.codeguru.com. * * @author Nabuo Tamemasa */ class SortableTableHeaderListener implements MouseListener, MouseMotionListener { /** A reference to the table model. */ private SortableTableModel model; /** The header renderer. */ private SortButtonRenderer renderer; /** The index of the column that is sorted - used to determine the state of the renderer. */ private int sortColumnIndex; /** * Standard constructor. * * @param model the model. * @param renderer the renderer. */ public SortableTableHeaderListener(final SortableTableModel model, final SortButtonRenderer renderer) { this.model = model; this.renderer = renderer; } /** * Sets the table model for the listener. * * @param model the model. */ public void setTableModel(final SortableTableModel model) { this.model = model; } /** * Handle a mouse press event - if the user is NOT resizing a column and NOT dragging a column * then give visual feedback that the column header has been pressed. * * @param e the mouse event. */ public void mousePressed(final MouseEvent e) { final JTableHeader header = (JTableHeader) e.getComponent(); if (header.getResizingColumn() == null) { // resizing takes precedence over sorting if (header.getDraggedDistance() < 1) { // dragging also takes precedence over sorting final int columnIndex = header.columnAtPoint(e.getPoint()); final int modelColumnIndex = header.getTable().convertColumnIndexToModel(columnIndex); if (this.model.isSortable(modelColumnIndex)) { this.sortColumnIndex = header.getTable().convertColumnIndexToModel(columnIndex); this.renderer.setPressedColumn(this.sortColumnIndex); header.repaint(); if (header.getTable().isEditing()) { header.getTable().getCellEditor().stopCellEditing(); } } else { this.sortColumnIndex = -1; } } } } /** * If the user is dragging or resizing, then we clear the sort column. * * @param e the mouse event. */ public void mouseDragged(final MouseEvent e) { final JTableHeader header = (JTableHeader) e.getComponent(); if ((header.getDraggedDistance() > 0) || (header.getResizingColumn() != null)) { this.renderer.setPressedColumn(-1); this.sortColumnIndex = -1; } } /** * This event is ignored (not required). * * @param e the mouse event. */ public void mouseEntered(final MouseEvent e) { // not required } /** * This event is ignored (not required). * * @param e the mouse event. */ public void mouseClicked(final MouseEvent e) { // not required } /** * This event is ignored (not required). * * @param e the mouse event. */ public void mouseMoved(final MouseEvent e) { // not required } /** * This event is ignored (not required). * * @param e the mouse event. */ public void mouseExited(final MouseEvent e) { // not required } /** * When the user releases the mouse button, we attempt to sort the table. * * @param e the mouse event. */ public void mouseReleased(final MouseEvent e) { final JTableHeader header = (JTableHeader) e.getComponent(); if (header.getResizingColumn() == null) { // resizing takes precedence over sorting if (this.sortColumnIndex != -1) { final SortableTableModel model = (SortableTableModel) header.getTable().getModel(); final boolean ascending = !model.isAscending(); model.setAscending(ascending); model.sortByColumn(this.sortColumnIndex, ascending); this.renderer.setPressedColumn(-1); // clear header.repaint(); } } } } /* * JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ----------------------- * SortableTableModel.java * ----------------------- * (C) Copyright 2000-2005, by Object Refinery Limited; * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: SortableTableModel.java,v 1.6 2008/09/10 09:26:11 mungady Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.* (DG); * 20-Nov-2001 : Made constructor protected (DG); * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); * */ /** * The base class for a sortable table model. * * @author David Gilbert */ abstract class SortableTableModel extends AbstractTableModel { /** The column on which the data is sorted (-1 for no sorting). */ private int sortingColumn; /** Indicates ascending (true) or descending (false) order. */ private boolean ascending; /** * Constructs a sortable table model. */ public SortableTableModel() { this.sortingColumn = -1; this.ascending = true; } /** * Returns the index of the sorting column, or -1 if the data is not sorted * on any column. * * @return the column used for sorting. */ public int getSortingColumn() { return this.sortingColumn; } /** * Returns <code>true</code> if the data is sorted in ascending order, and * <code>false</code> otherwise. * * @return <code>true</code> if the data is sorted in ascending order, and * <code>false</code> otherwise. */ public boolean isAscending() { return this.ascending; } /** * Sets the flag that determines whether the sort order is ascending or * descending. * * @param flag the flag. */ public void setAscending(final boolean flag) { this.ascending = flag; } /** * Sorts the table. * * @param column the column to sort on (zero-based index). * @param ascending a flag to indicate ascending order or descending order. */ public void sortByColumn(final int column, final boolean ascending) { if (isSortable(column)) { this.sortingColumn = column; } } /** * Returns a flag indicating whether or not a column is sortable. * * @param column the column (zero-based index). * * @return boolean. */ public boolean isSortable(final int column) { return false; } } /* * JCommon : a free general purpose class library for the Java(tm) platform * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ----------------------- * SortButtonRenderer.java * ----------------------- * (C) Copyright 2000-2004, by Nobuo Tamemasa and Contributors. * * Original Author: Nobuo Tamemasa; * Contributor(s): David Gilbert (for Object Refinery Limited); * Gareth Davis; * * $Id: SortButtonRenderer.java,v 1.7 2008/09/10 09:26:11 mungady Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.* (DG); * 26-Jun-2002 : Removed unnecessary import (DG); * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); * */ /** * A table cell renderer for table headings - uses one of three JButton instances to indicate the * sort order for the table column. * <P> * This class (and also BevelArrowIcon) is adapted from original code by Nobuo Tamemasa (version * 1.0, 26-Feb-1999) posted on www.codeguru.com. * * @author David Gilbert */ class SortButtonRenderer implements TableCellRenderer { /** * Useful constant indicating NO sorting. */ public static final int NONE = 0; /** * Useful constant indicating ASCENDING (that is, arrow pointing down) sorting in the table. */ public static final int DOWN = 1; /** * Useful constant indicating DESCENDING (that is, arrow pointing up) sorting in the table. */ public static final int UP = 2; /** * The current pressed column (-1 for no column). */ private int pressedColumn = -1; /** * The three buttons that are used to render the table header cells. */ private JButton normalButton; /** * The three buttons that are used to render the table header cells. */ private JButton ascendingButton; /** * The three buttons that are used to render the table header cells. */ private JButton descendingButton; /** * Used to allow the class to work out whether to use the buttuns * or labels. Labels are required when using the aqua look and feel cos the * buttons won't fit. */ private boolean useLabels; /** * The normal label (only used with MacOSX). */ private JLabel normalLabel; /** * The ascending label (only used with MacOSX). */ private JLabel ascendingLabel; /** * The descending label (only used with MacOSX). */ private JLabel descendingLabel; /** * Creates a new button renderer. */ public SortButtonRenderer() { this.pressedColumn = -1; this.useLabels = UIManager.getLookAndFeel().getID().equals("Aqua"); final Border border = UIManager.getBorder("TableHeader.cellBorder"); if (this.useLabels) { this.normalLabel = new JLabel(); this.normalLabel.setHorizontalAlignment(SwingConstants.LEADING); this.ascendingLabel = new JLabel(); this.ascendingLabel.setHorizontalAlignment(SwingConstants.LEADING); this.ascendingLabel.setHorizontalTextPosition(SwingConstants.LEFT); this.ascendingLabel.setIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, false)); this.descendingLabel = new JLabel(); this.descendingLabel.setHorizontalAlignment(SwingConstants.LEADING); this.descendingLabel.setHorizontalTextPosition(SwingConstants.LEFT); this.descendingLabel.setIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, false)); this.normalLabel.setBorder(border); this.ascendingLabel.setBorder(border); this.descendingLabel.setBorder(border); } else { this.normalButton = new JButton(); this.normalButton.setMargin(new Insets(0, 0, 0, 0)); this.normalButton.setHorizontalAlignment(SwingConstants.LEADING); this.ascendingButton = new JButton(); this.ascendingButton.setMargin(new Insets(0, 0, 0, 0)); this.ascendingButton.setHorizontalAlignment(SwingConstants.LEADING); this.ascendingButton.setHorizontalTextPosition(SwingConstants.LEFT); this.ascendingButton.setIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, false)); this.ascendingButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, true)); this.descendingButton = new JButton(); this.descendingButton.setMargin(new Insets(0, 0, 0, 0)); this.descendingButton.setHorizontalAlignment(SwingConstants.LEADING); this.descendingButton.setHorizontalTextPosition(SwingConstants.LEFT); this.descendingButton.setIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, false)); this.descendingButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, true)); this.normalButton.setBorder(border); this.ascendingButton.setBorder(border); this.descendingButton.setBorder(border); } } /** * Returns the renderer component. * * @param table the table. * @param value the value. * @param isSelected selected? * @param hasFocus focussed? * @param row the row. * @param column the column. * @return the renderer. */ public Component getTableCellRendererComponent(final JTable table, final Object value, final boolean isSelected, final boolean hasFocus, final int row, final int column) { if (table == null) { throw new NullPointerException("Table must not be null."); } final JComponent component; final SortableTableModel model = (SortableTableModel) table.getModel(); final int cc = table.convertColumnIndexToModel(column); final boolean isSorting = (model.getSortingColumn() == cc); final boolean isAscending = model.isAscending(); final JTableHeader header = table.getTableHeader(); final boolean isPressed = (cc == this.pressedColumn); if (this.useLabels) { final JLabel label = getRendererLabel(isSorting, isAscending); label.setText((value == null) ? "" : value.toString()); component = label; } else { final JButton button = getRendererButton(isSorting, isAscending); button.setText((value == null) ? "" : value.toString()); button.getModel().setPressed(isPressed); button.getModel().setArmed(isPressed); component = button; } if (header != null) { component.setForeground(header.getForeground()); component.setBackground(header.getBackground()); component.setFont(header.getFont()); } return component; } /** * Returns the correct button component. * * @param isSorting whether the render component represents the sort column. * @param isAscending whether the model is ascending. * @return either the ascending, descending or normal button. */ private JButton getRendererButton(final boolean isSorting, final boolean isAscending) { if (isSorting) { if (isAscending) { return this.ascendingButton; } else { return this.descendingButton; } } else { return this.normalButton; } } /** * Returns the correct label component. * * @param isSorting whether the render component represents the sort column. * @param isAscending whether the model is ascending. * @return either the ascending, descending or normal label. */ private JLabel getRendererLabel(final boolean isSorting, final boolean isAscending) { if (isSorting) { if (isAscending) { return this.ascendingLabel; } else { return this.descendingLabel; } } else { return this.normalLabel; } } /** * Sets the pressed column. * * @param column the column. */ public void setPressedColumn(final int column) { this.pressedColumn = column; } } /* * JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------------- * BevelArrowIcon.java * ------------------- * (C) Copyright 2000-2004, by Nobuo Tamemasa and Contributors. * * Original Author: Nobuo Tamemasa; * Contributor(s): David Gilbert (for Object Refinery Limited); * * $Id: BevelArrowIcon.java,v 1.5 2007/11/02 17:50:36 taqua Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.*; * 13-Oct-2002 : Fixed errors reported by Checkstyle (DG); * */ /** * An arrow icon that can point up or down (usually used to indicate the sort direction in a table). * <P> * This class (and also SortButtonRenderer) is based on original code by Nobuo Tamemasa (version * 1.0, 26-Feb-1999) posted on www.codeguru.com. * * @author Nobuo Tamemasa */ class BevelArrowIcon implements Icon { /** Constant indicating that the arrow is pointing up. */ public static final int UP = 0; /** Constant indicating that the arrow is pointing down. */ public static final int DOWN = 1; /** The default arrow size. */ private static final int DEFAULT_SIZE = 11; /** Edge color 1. */ private Color edge1; /** Edge color 2. */ private Color edge2; /** The fill color for the arrow icon. */ private Color fill; /** The size of the icon. */ private int size; /** The direction that the arrow is pointing (UP or DOWN). */ private int direction; /** * Standard constructor - builds an icon with the specified attributes. * * @param direction . * @param isRaisedView . * @param isPressedView . */ public BevelArrowIcon(final int direction, final boolean isRaisedView, final boolean isPressedView) { if (isRaisedView) { if (isPressedView) { init(UIManager.getColor("controlLtHighlight"), UIManager.getColor("controlDkShadow"), UIManager.getColor("controlShadow"), DEFAULT_SIZE, direction); } else { init(UIManager.getColor("controlHighlight"), UIManager.getColor("controlShadow"), UIManager.getColor("control"), DEFAULT_SIZE, direction); } } else { if (isPressedView) { init(UIManager.getColor("controlDkShadow"), UIManager.getColor("controlLtHighlight"), UIManager.getColor("controlShadow"), DEFAULT_SIZE, direction); } else { init(UIManager.getColor("controlShadow"), UIManager.getColor("controlHighlight"), UIManager.getColor("control"), DEFAULT_SIZE, direction); } } } /** * Standard constructor - builds an icon with the specified attributes. * * @param edge1 the color of edge1. * @param edge2 the color of edge2. * @param fill the fill color. * @param size the size of the arrow icon. * @param direction the direction that the arrow points. */ public BevelArrowIcon(final Color edge1, final Color edge2, final Color fill, final int size, final int direction) { init(edge1, edge2, fill, size, direction); } /** * Paints the icon at the specified position. Supports the Icon interface. * * @param c . * @param g . * @param x . * @param y . */ public void paintIcon(final Component c, final Graphics g, final int x, final int y) { switch (this.direction) { case DOWN: drawDownArrow(g, x, y); break; case UP: drawUpArrow(g, x, y); break; } } /** * Returns the width of the icon. Supports the Icon interface. * * @return the icon width. */ public int getIconWidth() { return this.size; } /** * Returns the height of the icon. Supports the Icon interface. * @return the icon height. */ public int getIconHeight() { return this.size; } /** * Initialises the attributes of the arrow icon. * * @param edge1 the color of edge1. * @param edge2 the color of edge2. * @param fill the fill color. * @param size the size of the arrow icon. * @param direction the direction that the arrow points. */ private void init(final Color edge1, final Color edge2, final Color fill, final int size, final int direction) { this.edge1 = edge1; this.edge2 = edge2; this.fill = fill; this.size = size; this.direction = direction; } /** * Draws the arrow pointing down. * * @param g the graphics device. * @param xo ?? * @param yo ?? */ private void drawDownArrow(final Graphics g, final int xo, final int yo) { g.setColor(this.edge1); g.drawLine(xo, yo, xo + this.size - 1, yo); g.drawLine(xo, yo + 1, xo + this.size - 3, yo + 1); g.setColor(this.edge2); g.drawLine(xo + this.size - 2, yo + 1, xo + this.size - 1, yo + 1); int x = xo + 1; int y = yo + 2; int dx = this.size - 6; while (y + 1 < yo + this.size) { g.setColor(this.edge1); g.drawLine(x, y, x + 1, y); g.drawLine(x, y + 1, x + 1, y + 1); if (0 < dx) { g.setColor(this.fill); g.drawLine(x + 2, y, x + 1 + dx, y); g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1); } g.setColor(this.edge2); g.drawLine(x + dx + 2, y, x + dx + 3, y); g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1); x += 1; y += 2; dx -= 2; } g.setColor(this.edge1); g.drawLine(xo + (this.size / 2), yo + this.size - 1, xo + (this.size / 2), yo + this.size - 1); } /** * Draws the arrow pointing up. * * @param g the graphics device. * @param xo ?? * @param yo ?? */ private void drawUpArrow(final Graphics g, final int xo, final int yo) { g.setColor(this.edge1); int x = xo + (this.size / 2); g.drawLine(x, yo, x, yo); x--; int y = yo + 1; int dx = 0; while (y + 3 < yo + this.size) { g.setColor(this.edge1); g.drawLine(x, y, x + 1, y); g.drawLine(x, y + 1, x + 1, y + 1); if (0 < dx) { g.setColor(this.fill); g.drawLine(x + 2, y, x + 1 + dx, y); g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1); } g.setColor(this.edge2); g.drawLine(x + dx + 2, y, x + dx + 3, y); g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1); x -= 1; y += 2; dx += 2; } g.setColor(this.edge1); g.drawLine(xo, yo + this.size - 3, xo + 1, yo + this.size - 3); g.setColor(this.edge2); g.drawLine(xo + 2, yo + this.size - 2, xo + this.size - 1, yo + this.size - 2); g.drawLine(xo, yo + this.size - 1, xo + this.size, yo + this.size - 1); } }