paintbrush.java

一个简单的画图板JAVA程序

		metric.addItemListener(new ItemListener() {// 字体选择
					public void itemStateChanged(ItemEvent event) {
						if (event.getStateChange() == ItemEvent.SELECTED)
							stroke2 = Float.parseFloat(fontMetrics[metric
									.getSelectedIndex()]);
					}
				});
		stroke2 = Float.parseFloat(fontMetrics[0]);

		countrys = new JComboBox(nation);
		countrys.setMaximumRowCount(2);

		bold = new JCheckBox("粗体");
		bold.addItemListener(new ItemListener() {// 选择粗体
					public void itemStateChanged(ItemEvent event) {
						if (bold.isSelected())
							valBold = Font.BOLD;
						else
							valBold = Font.PLAIN;
					}
				});

		italic = new JCheckBox("斜体");
		italic.addItemListener(new ItemListener() {// 选择斜体
					public void itemStateChanged(ItemEvent event) {
						if (italic.isSelected())
							valItalic = Font.ITALIC;
						else
							valItalic = Font.PLAIN;
					}
				});
		plain = new JLabel(new ImageIcon("Icons/1.gif"));

		fontBar.add(fontl);
		fontBar.addSeparator();
		fontBar.add(metric);
		fontBar.addSeparator();
		fontBar.add(countrys);
		fontBar.addSeparator();
		fontBar.add(bold);
		fontBar.add(italic);
		fontBar.addSeparator();
		fontBar.add(plain);

		// 添加弹出菜单及其事件监听
		popupMenu = new JPopupMenu();

		pUndoItem = new JMenuItem("撤销(U)", 'U');
		pUndoItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_U,
				InputEvent.CTRL_MASK));
		pSaveItem = new JMenuItem("储存(S)", 'S');
		pSaveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
				InputEvent.CTRL_MASK));
		pToolItem = new JMenuItem("工具箱(T)", 'T');
		pToolItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T,
				InputEvent.CTRL_MASK));
		;
		pColorBoxItem = new JMenuItem("颜料盒(C)", 'C');
		pColorBoxItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
				InputEvent.CTRL_MASK));
		pTextEditItem = new JMenuItem("文字工具栏(E)", 'E');
		pTextEditItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,
				InputEvent.CTRL_MASK));
		pAddItem = new JMenuItem("子窗口(A)", 'A');
		pAddItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,
				InputEvent.CTRL_MASK));
		pStateItem = new JMenuItem("状态栏(S)", 'S');
		pStateItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
				InputEvent.CTRL_MASK));

		popupMenu.add(pUndoItem);
		pUndoItem.addActionListener(this);
		pUndoItem.setEnabled(false);
		popupMenu.add(pSaveItem);
		pSaveItem.addActionListener(this);
		popupMenu.addSeparator();
		popupMenu.add(pToolItem);
		pToolItem.addActionListener(this);
		popupMenu.add(pColorBoxItem);
		pColorBoxItem.addActionListener(this);
		popupMenu.add(pTextEditItem);
		pTextEditItem.addActionListener(this);
		pTextEditItem.setEnabled(false);
		popupMenu.add(pAddItem);
		pAddItem.addActionListener(this);
		popupMenu.addSeparator();
		popupMenu.add(pStateItem);
		pStateItem.addActionListener(this);

		addMouseListener(new MouseAdapter() {// 鼠标事件：弹出菜单
			public void mousePressed(MouseEvent event) {
				checkForTriggerEvent(event);
			}

			public void mouseReleased(MouseEvent event) {
				checkForTriggerEvent(event);
			}

			private void checkForTriggerEvent(MouseEvent event) {// 检查是否弹出菜单
				if (event.isPopupTrigger())
					popupMenu.show(event.getComponent(), event.getX(), event
							.getY());
				checkMenuItemEnabled();
			}
		});

		// 添加状态栏
		statusBar = new JPanel();
		statusBar.setLayout(new GridLayout(1, 3));
		tip = new JLabel();
		coordinate = new JLabel();
		information = new JLabel();

		tip.setText("要获得帮助，请在“帮助“菜单中，单击“帮助主题“.");
		statusBar.add(tip);
		statusBar.add(coordinate);
		statusBar.add(information);

		// container.add(drawArea,BorderLayout.CENTER );
		container.add(fontBar, BorderLayout.NORTH);
		fontBar.setVisible(false);
		container.add(colorBar, BorderLayout.EAST);
		// colorBar.setVisible(false);
		container.add(toolBar, BorderLayout.WEST);
		// toolBar.setVisible(false);
		container.add(statusBar, BorderLayout.SOUTH);
		// statusBar.setVisible(false);

		createNewItem();
		checkMenuItemEnabled();
		validate();
		setLocation(250, 200);// 设置窗口位置
		setSize(WIDTH, HEIGHT);// 设置窗口大小
		setVisible(true);

	}// end constructor

	/**
	 * author 王宇新，author 王德恩<br>
	 * version 1.0 07-6-4<br>
	 * author 周新飞<br>
	 * version 2.0 07-6-12<br>
	 * 完成各种事件处理
	 */
	public void actionPerformed(ActionEvent event) {
		// 完成’文件‘菜单的事件
		if (event.getSource() == newItem) {// 新建一个文件
			int saveChoose = JOptionPane.NO_OPTION;
			if (index != 0) {
				saveChoose = JOptionPane.showConfirmDialog(this,
						"您的文件尚未保存。是否保存?", "提示",
						JOptionPane.YES_NO_CANCEL_OPTION);
			}

			if (saveChoose == JOptionPane.YES_OPTION) {
				JFileChooser fileChooser = new JFileChooser();
				fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

				int result = fileChooser.showSaveDialog(this);
				if (result == JFileChooser.CANCEL_OPTION)
					return;
				File fileName = fileChooser.getSelectedFile();
				fileName.canWrite();

				if (fileName == null || fileName.getName().equals(""))
					JOptionPane.showMessageDialog(fileChooser, "不合法的文件名",
							"不合法的文件名", JOptionPane.ERROR_MESSAGE);
				else {
					try {
						img = ImageIO.read(fileName);
						img_g2d = img.createGraphics();
						index = 0;
						createNewItem();
						repaint();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			} else if (saveChoose == JOptionPane.NO_OPTION) {
				index = 0;
				currentChoice = 5;
				color = Color.black;
				stroke1 = 1.0f;

				createNewItem();
				repaint();// 将有关值设置为初始状态，并且重画
			} else if (saveChoose == JOptionPane.CANCEL_OPTION)
				return;
		}

		else if (event.getSource() == saveItem
				|| event.getSource() == pSaveItem) {// 保存文件
			JFileChooser fileChooser = new JFileChooser();
			fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
			fileChooser.setFileFilter(new JPGFilter());
			fileChooser.setFileFilter(new GIFFilter());
			fileChooser.setFileFilter(new PNGFilter());

			int result = fileChooser.showSaveDialog(this);
			if (result == JFileChooser.CANCEL_OPTION)
				return;
			File fileName = fileChooser.getSelectedFile();
			fileName.canWrite();
			// filter.addSuffix( fileName);
			if (fileName == null || fileName.getName().equals(""))
				JOptionPane.showMessageDialog(fileChooser, "不合法的文件名",
						"不合法的文件名", JOptionPane.ERROR_MESSAGE);
			else {
				try {
					fileName.delete();
					FileOutputStream fos = new FileOutputStream(fileName);

					int j = 0;
					while (j <= index) {
						img_g2d.drawImage(img, 0, 0, frame);
						draw(img_g2d, itemList[j]);
						j++;
					}

					repaint();
					ImageIO.write(img, "JPEG", fileName);
				} catch (IOException ioe) {
					ioe.printStackTrace();
				}
			}
		}

		else if (event.getSource() == openItem) {// 打开文件
			JFileChooser fileChooser = new JFileChooser();
			fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

			int result = fileChooser.showOpenDialog(this);
			if (result == JFileChooser.CANCEL_OPTION)
				return;
			File fileName = fileChooser.getSelectedFile();
			fileName.canRead();
			if (fileName == null || fileName.getName().equals(""))
				JOptionPane.showMessageDialog(fileChooser, "文件错误", "文件错误",
						JOptionPane.ERROR_MESSAGE);
			else {
				try {
					img = ImageIO.read(fileName);
					img_g2d = img.createGraphics();
					index = 0;
					createNewItem();
					repaint();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

		else if (event.getSource() == exitItem) {// 退出程序
			int exitChoose = JOptionPane.showConfirmDialog(this, "确定要退出么？",
					"退出提示", JOptionPane.OK_CANCEL_OPTION);
			if (exitChoose == JOptionPane.OK_OPTION)
				System.exit(0);
			else
				return;
		}

		// 完成‘编辑’菜单的事件
		else if (event.getSource() == addItem || event.getSource() == pAddItem) {// 添加子窗口
			inframeNum++;
			frame = new JInternalFrame("子窗口" + inframeNum, true, true, true,
					true);
			frame.setBackground(SystemColor.textHighlightText);
			frame.setLocation(80 * (inframeNum - 1), 80 * (inframeNum - 1));
			Container container = frame.getContentPane();
			container.add(drawArea, BorderLayout.CENTER);

			// frame.addMouseListener( new MouseA());
			// frame.addMouseMotionListener(new MouseB());
			frame.pack();
			theDesktop.add(frame);
			frame.setVisible(true);
		} else if (event.getSource() == undoItem
				|| event.getSource() == pUndoItem) {// 撤销功能
			checkMenuItemEnabled();
			drawArea.setEnabled(false);
			redoItem.setEnabled(true);
			index = undoStep[undoIndex - 2];
			System.out.print(undoIndex);
			undoIndex--;

			createNewItem();
			repaint();
		} else if (event.getSource() == redoItem) {// 重复功能
			checkMenuItemEnabled();
			drawArea.setEnabled(false);
			index = undoStep[undoIndex++];
			createNewItem();
			repaint();
		}

		// 实现‘颜色’菜单的事件
		else if (event.getSource() == editcolorItem
				|| event.getSource() == otherButton) {// 编辑颜色
			color = JColorChooser.showDialog(PaintBrush.this, "自定义", color);

			if (color == null)
				color = Color.LIGHT_GRAY;

			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		}

		// 实现‘察看‘菜单的事件
		else if (event.getSource() == toolItem
				|| event.getSource() == pToolItem) {// 工具栏
			if (toolBar.isVisible())
				toolBar.setVisible(false);
			else
				toolBar.setVisible(true);
		} else if (event.getSource() == colorBoxItem
				|| event.getSource() == pColorBoxItem) {// 颜色工具栏
			if (colorBar.isVisible())
				colorBar.setVisible(false);
			else
				colorBar.setVisible(true);
		} else if (event.getSource() == textEditItem
				|| event.getSource() == pTextEditItem) {// 文字工具栏
			checkMenuItemEnabled();
			if (fontBar.isVisible())
				fontBar.setVisible(false);
			else
				fontBar.setVisible(true);
		}

		else if (event.getSource() == stateItem
				|| event.getSource() == pStateItem) {// 状态栏
			if (statusBar.isVisible())
				statusBar.setVisible(false);
			else
				statusBar.setVisible(true);
		}

		// 实现‘帮助’菜单的事件
		else if (event.getSource() == helpItem) {// 帮助窗口
			String output = "\n   欢迎访问个人版画图工具！\n\n   如有疑问，请参考Microsoft 画图工具.";
			JOptionPane.showMessageDialog(this, output, "画图",
					JOptionPane.QUESTION_MESSAGE);
		}

		else if (event.getSource() == aboutItem) {// 关于窗口
			String output = "  厦门大学软件学院(R)\n\n   个人版2007\n\n  版权所有 (C) 2007-  周新飞"
					+ "\n\n  欢迎大家使用！";
			JOptionPane.showMessageDialog(this, output, "关于画图",
					JOptionPane.INFORMATION_MESSAGE);
		}

		// 处理工具栏的按钮事件
		else if (event.getSource() == penButton) {
			currentChoice = 1;
			createNewItem();// 调用函数画图
		} else if (event.getSource() == brushButton) {
			currentChoice = 2;
			createNewItem();
		} else if (event.getSource() == eraserButton) {
			currentChoice = 5;
			createNewItem();
		} else if (event.getSource() == sprayButton) {
			currentChoice = 6;
			createNewItem();
		} else if (event.getSource() == characterButton) {
			currentChoice = 7;
			fontBar.setVisible(true);
			textEditItem.setEnabled(true);
			pTextEditItem.setEnabled(true);
			createNewItem();
		} else if (event.getSource() == lineButton) {
			currentChoice = 8;
			createNewItem();
		} else if (event.getSource() == rectangleButton) {
			currentChoice = 9;
			normalRadioButton.setSelected(true);
			createNewItem();
		} else if (event.getSource() == polygonButton) {
			currentChoice = 12;
			normalRadioButton.setSelected(true);
			createNewItem();
		} else if (event.getSource() == ellipseButton) {
			currentChoice = 15;
			normalRadioButton.setSelected(true);
			createNewItem();
		} else if (event.getSource() == roundrectangleButton) {
			currentChoice = 18;
			normalRadioButton.setSelected(true);
			createNewItem();
		}

		// 处理颜色工具栏的事件
		else if (event.getSource() == blackButton) {
			color = Color.BLACK;
			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		} else if (event.getSource() == whiteButton) {
			color = Color.WHITE;
			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		} else if (event.getSource() == redButton) {
			color = Color.RED;
			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		} else if (event.getSource() == greenButton) {
			color = Color.GREEN;
			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		} else if (event.getSource() == blueButton) {
			color = Color.BLUE;
			R = color.getRed();
			G = color.getGreen();
			B = color.getBlue();
			itemList[index].R = R;
			itemList[index].G = G;
			itemList[index].B = B;
		}

	}// end actionPerformed

	/**
	 * @author 周新飞
	 * @version 1.0 07-6-14
	 * @version 2.0 07-6-18
	 * @see MouseA 功能：实现鼠标事件功能
	 */
	public class MouseA extends MouseAdapter {
		public void mousePressed(MouseEvent event) {
			checkForTriggerEvent(event);
			itemList[index].x1 = itemList[index].x2 = event.getX();
			itemList[index].y1 = itemList[index].y2 = event.getY();
			start_x = event.getX();
			start_y = event.getY();

			coordinate.setText(event.getX() + "," + event.getY());

			if (currentChoice == 1 || currentChoice == 2 || currentChoice == 3
					|| currentChoice == 4 || currentChoice == 5) {
				itemList[index].x1 = itemList[index].x2 = event.getX();
				itemList[index].y1 = itemList[index].y2 = event.getY();
				index++;
				createNewItem();
			}

			else if (currentChoice == 7) {

				itemList[index].x1 = event.getX();
				itemList[index].y1 = event.getY();

				String input;
				input = JOptionPane.showInputDialog("input:");
				itemList[index].string = input;
				itemList[index].x2 = valBold;
				itemList[index].y2 = valItalic;
				itemList[index].fonts = font;
				itemList[index].stroke = stroke2;

				index++;
				currentChoice = 7;
				createNewItem();

				repaint();
			}

			else if (currentChoice == 6) {

				Stack stack = new Stack();
				px = itemList[index].x1 = itemList[index].x2 = event.getX();
				py = itemList[index].y1 = itemList[index].y2 = event.getY();
				Color color = drawArea.getPixleColor(px, py);
				System.out.print(color + "\n");
				Point seed1 = new Point(px, py);

				index++;