ibatis学习时的项目

package com.other; import java.awt.Canvas; import java.awt.Color; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Frame; import java.awt.Graphics; import java.awt.MenuItem; import java.awt.PopupMenu; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; public class HandDraw { // 画图区的宽度 private final int AREA_WIDTH = 500; // 画图区的高度 private final int AREA_HEIGHT = 400; // preX,preY保存上一次鼠标拖动事件的鼠标坐标 private int preX = -1; private int preY = -1; // 右键菜单，设置画笔颜色 PopupMenu pop = new PopupMenu(); MenuItem redItem = new MenuItem("red"); MenuItem greenItem = new MenuItem("green"); MenuItem blueItem = new MenuItem("blue"); // BufferImage对象 BufferedImage image = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_RGB); // Graphics Graphics g = image.getGraphics(); private Frame f = new Frame("简单手绘程序"); private DrawCanvas drawArea = new DrawCanvas(); // 保存画笔颜色 private Color foreColor = new Color(255, 0, 0); public void init() { // 右键菜单的监听器 ActionListener menuListener = new ActionListener() { public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("green")) { foreColor = Color.GREEN; } if (e.getActionCommand().equals("red")) { foreColor = Color.red; } if (e.getActionCommand().equals("blue")) { foreColor = Color.blue; } } }; // 菜单添加事件监听器 redItem.addActionListener(menuListener); greenItem.addActionListener(menuListener); blueItem.addActionListener(menuListener); pop.add(redItem); pop.add(greenItem); pop.add(blueItem); drawArea.add(pop); g.fillRect(0, 0, AREA_WIDTH, AREA_WIDTH); drawArea.setPreferredSize(new Dimension(AREA_WIDTH, AREA_WIDTH)); // 监听鼠标移动动作 drawArea.addMouseMotionListener(new MouseMotionListener() { public void mouseDragged(MouseEvent e) { drawArea.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR)); // 如果perX,preY大于0 if (preX > 0 && preY > 0) { // 设置当前颜色 g.setColor(foreColor); g.drawLine(preX, preY, e.getX(), e.getY()); } // 净鼠标事件点的X，Y坐标保存 preX = e.getX(); preY = e.getY(); // 重绘 drawArea.repaint(); } public void mouseMoved(MouseEvent e) { } }); // 监听鼠标事件 drawArea.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) { // 弹出右键菜单 if (e.isPopupTrigger()) { pop.show(drawArea, e.getX(), e.getY()); } // 还原 preX = -1; preY = -1; } }); f.add(drawArea); f.pack(); f.setVisible(true); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); } class DrawCanvas extends Canvas { private static final long serialVersionUID = -3574675228163764451L; @Override public void paint(Graphics g) { g.drawImage(image, 0, 0, null); } } public static void main(String... strings) { new HandDraw().init(); } }