package xatu05;import java.awt.*;import java.awt.event.*;import javax.swing.*;//import javax.swing.event.*;public class PainterPanel extends JPanel implements MouseListener { private static final long serialVersionUID = 1L; int shape = -1; // 图案类型 Point[] point = new Point[2]; // 记录鼠标拖动的起始点和终点 public PainterPanel() { super(); // 调用父类构造函数 this.setBackground(Color.white); // 设置背景颜色 point[0] = new Point(-1, -1); // 初始化变量 point[1] = new Point(-1, -1); addMouseListener(this); // 增加鼠标事件 } public void mouseReleased(MouseEvent e) { // 鼠标释放事件 point[1] = new Point(e.getX(), e.getY()); // 设置终点位置 repaint(); // 重绘屏幕 } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } public void mouseClicked(MouseEvent e) { } public void mousePressed(MouseEvent e) { // 鼠标按下时事件 point[0] = new Point(e.getX(), e.getY()); // 设置起始点位置 } public void paint(Graphics g) { super.paint(g); switch (shape) { // 根据shape值绘制图形 case 0: g.drawLine(point[0].x, point[0].y, point[1].x, point[1].y); // 绘线 break; case 1: int width = point[1].x - point[0].x; int height = point[1].y - point[0].y; g.drawOval(point[0].x, point[0].y, width, height); // 绘椭圆 break; case 2: int width1 = point[1].x - point[0].x; int height1 = point[1].y - point[0].y; g.fillOval(point[0].x, point[0].y, width1, height1); // 绘实心椭圆 break; case 3: width1 = point[1].x - point[0].x; ; height = point[1].y - point[0].y; g.drawRect(point[0].x, point[0].y, width1, height); // 绘矩形 break; case 4: width1 = point[1].x - point[0].x; ; height1 = point[1].y - point[0].y; g.fillRect(point[0].x, point[0].y, width1, height1); // 绘实心矩形 break; } } public void drawShape(int shape) { this.shape = shape; }}/*
*上面代码没有问题
*/
package xatu05;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//import javax.swing.event.*;
import xatu05.PainterPanel;
public class PainterDemo extends JFrame {
String menuItems[][] = { {}, { "空心椭圆", "实心椭圆" }, { "空心矩形", "实心矩形" }, {} };
public void init() {
JMenuBar br = new JMenuBar(); // 创建菜单工具栏
String menu[] = { "直线", "椭圆", "矩形", "多边形" };
for (int i = 0; i < menu.length; i++) { // 用数组创建Menu
JMenu menu1 = new JMenu(menu);
br.add(menu1);
for (int k = 0; k < menuItems.length; k++) {
menu1.add(new JMenuItem(menuItems[k]));
//注册菜单事件，增加菜单处理事件如何做
}
}
super.setJMenuBar(br);
}
JToggleButton[] button = new JToggleButton[6]; // 按钮组
PainterPanel painter = new PainterPanel(); // 绘图面板
public PainterDemo() {
super("Java画图程序"); // 调用父类构造函数
init();
// String[][] menultems = {{"直线"},{"空心椭圆","实心椭圆"}};
String[] buttonName = { "直线", "空心椭圆", "实心椭圆", "空心矩形", "实心矩形", "多边形" }; // 按钮文字
DrawShapeListener buttonListener = new DrawShapeListener();// 按钮事件
JToolBar toolBar = new JToolBar(); // 实例化工具栏
ButtonGroup buttonGroup = new ButtonGroup(); // 实例化按钮组
for (int i = 0; i < button.length; i++) {
button = new JToggleButton(buttonName); // 实例化按钮
// button = new JToggleButton(buttonName);
button.addActionListener(buttonListener); // 增加按钮事件处理
buttonGroup.add(button); // 增加按钮到按钮组
toolBar.add(button); // 增加按钮到工具栏
}
Container container = getContentPane(); // 得到窗口容器
container.add(toolBar, BorderLayout.SOUTH); // 增加组件到容器上
container.add(painter, BorderLayout.CENTER);
setSize(600, 700);// 设置窗口尺寸
setLocation(500, 70);
setVisible(true); // 设置窗口为可视
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 关闭窗口时退出程序
}
// class DrawShapeListener implements ActionListener { // 按钮事件处理
// public void actionPerformed(ActionEvent e) {
// for (int i = 0; i < menuItems.length; i++) {
// if (e.getSource() == menuItems) { // 判断来自于哪个菜单
// painter.drawShape(i); // 绘制图形
// }
// }
// }
// }
class DrawShapeListener implements ActionListener { // 按钮事件处理
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < button.length; i++) {
if (e.getSource() == button) { // 判断来自于哪个按钮
painter.drawShape(i); // 绘制图形
}
}
}
}
public static void main(String[] args) {
new PainterDemo();
}
} |
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