用继承、多态实验绘制三角形、圆、矩形

package com.main; import java.awt.Canvas; import java.awt.Color; import java.awt.Graphics; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.io.BufferedReader; import java.io.FileReader; import java.io.FileWriter; import java.util.ArrayList; import java.util.List; import javax.swing.JColorChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import com.Database.DataBase; import com.Shape.*; import com.Tool.*; public class DrawFrame extends JFrame implements ActionListener{ PaintCanvas paintCanvas = null; public PaintCanvas getPaintCanvas() { return paintCanvas; } public void setPaintCanvas(PaintCanvas paintCanvas) { this.paintCanvas = paintCanvas; } public DrawFrame() { super("使用鼠标画直线"); setBounds(400, 300, 400, 300); setDefaultCloseOperation(EXIT_ON_CLOSE); paintCanvas = new PaintCanvas(); getContentPane().add(paintCanvas); this.addmyMenu(); setVisible(true); } private void addmyMenu() { JMenuBar menubar = new JMenuBar(); this.setJMenuBar(menubar); String menustr[] = { "文件", "工具", "颜色", "帮助" }; JMenu menu[] = new JMenu[menustr.length]; for (int i = 0; i < menustr.length; i++) { menu[i] = new JMenu(menustr[i]); menubar.add(menu[i]); } JMenuItem menuItem_open = new JMenuItem("打开"); menu[0].add(menuItem_open); menuItem_open.addActionListener(this); JMenuItem menuItem_save = new JMenuItem("保存"); menu[0].add(menuItem_save); menuItem_save.addActionListener(this); JMenuItem menuItem_line = new JMenuItem("直线"); menu[1].add(menuItem_line); menuItem_line.addActionListener(this); JMenuItem menuItem_Rectangle = new JMenuItem("矩形"); menu[1].add(menuItem_Rectangle); menuItem_Rectangle.addActionListener(this); JMenuItem menuItem_Circle = new JMenuItem("椭圆"); menu[1].add(menuItem_Circle); menuItem_Circle.addActionListener(this); JMenuItem menuItem_三角形 = new JMenuItem("三角形"); menu[1].add(menuItem_三角形); menuItem_三角形.addActionListener(this); JMenuItem menuItem_颜色 = new JMenuItem("颜色"); menu[2].add(menuItem_颜色); menuItem_颜色.addActionListener(this); menu[1].addSeparator(); JMenuItem menuItem_exit = new JMenuItem("退出"); menu[1].add(menuItem_exit); menuItem_exit.addActionListener(this); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub if (e.getSource() instanceof JMenuItem) { if (e.getActionCommand() == "打开") { try { OpenThread openThread = new OpenThread(); openThread.start(); } catch(Exception ee) { } } if (e.getActionCommand() == "保存") { try { FileWriter fout = new FileWriter("D:\\shape.txt"); for(int i = 0; DataBase.getListShape()!=null && i<DataBase.getListShape().size();i++) { fout.write(DataBase.getListShape().get(i).toString()); } fout.close(); } catch(Exception ee) { } } if (e.getActionCommand() == "直线") { this.paintCanvas.toolManager.setTool(new LineTool()); } if (e.getActionCommand() == "矩形") { this.paintCanvas.toolManager.setTool(new RectTool()); } if (e.getActionCommand() == "椭圆") { this.paintCanvas.toolManager.setTool(new CircleTool()); } if (e.getActionCommand() == "三角形") { this.paintCanvas.toolManager.setTool(new TrigleTool()); } if (e.getActionCommand() == "颜色") { DataBase.setColor(JColorChooser.showDialog(this, "选择颜色", Color.BLUE)); } } } public static class PaintCanvas extends Canvas implements MouseListener, MouseMotionListener { public ToolManager toolManager = new ToolManager(); public ToolManager getToolManager() { return toolManager; } public void setToolManager(ToolManager toolManager) { this.toolManager = toolManager; } Point start, end, lastend; public PaintCanvas() { toolManager.setTool(new SelectTool()); start = end = lastend = null; addMouseListener(this); addMouseMotionListener(this); } @Override public void paint(Graphics g) { super.paint(g); for(int i = 0; DataBase.getListShape()!=null && i<DataBase.getListShape().size();i++) { DataBase.getListShape().get(i).draw(g); if(DataBase.getListShape().get(i).getIsSelected() == 1) { DataBase.getListShape().get(i).drawControl(g); } } /*if (start != null && lastend != null) { g.setColor(this.getBackground()); g.drawLine(start.x, start.y, lastend.x, lastend.y); g.setColor(Color.BLUE); g.drawLine(start.x, start.y, end.x, end.y); } */ } @Override public void update(Graphics g) { super.update(g); paint(g); } @Override public void mouseDragged(MouseEvent e) { toolManager.mouseMove(new Point(e.getX(), e.getY())); // lastend = end; // end = new Point(e.getX(), e.getY()); // repaint(); } @Override public void mouseMoved(MouseEvent e) { try { toolManager.mouseMove(new Point(e.getX(), e.getY())); } catch(Exception ee) { } } @Override public void mouseClicked(MouseEvent e) { } @Override public void mouseEntered(MouseEvent e) { } @Override public void mouseExited(MouseEvent e) { } @Override public void mousePressed(MouseEvent e) { toolManager.mouseDown(new Point(e.getX(), e.getY())); start = new Point(e.getX(), e.getY()); } @Override public void mouseReleased(MouseEvent e) { Point point = new Point(e.getX(), e.getY()); toolManager.mouseUp(point); //end = new Point(e.getX(), e.getY()); //repaint(); } } }