java怎么实现鼠标拖动画矩形

112次阅读

共计 1292 个字符，预计需要花费 4 分钟才能阅读完成。

要实现鼠标拖动画矩形，可以使用 Java 的 Swing 库来完成。下面是一个简单的示例代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class DraggableRectangle extends JFrame {private int initialX, initialY;
    private int currentX, currentY;
    private Rectangle rectangle;

    public DraggableRectangle() {setTitle("Draggable Rectangle");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建矩形并设置初始位置和大小 
        rectangle = new Rectangle(100, 100, 100, 100);

        // 添加鼠标事件监听器 
        addMouseListener(new MouseAdapter() {@Override
            public void mousePressed(MouseEvent e) {// 记录鼠标按下时的初始位置 
                initialX = e.getX();
                initialY = e.getY();}
        });

        addMouseMotionListener(new MouseAdapter() {@Override
            public void mouseDragged(MouseEvent e) {// 计算鼠标拖动后的位置 
                currentX = e.getX();
                currentY = e.getY();

                // 计算矩形的偏移量 
                int offsetX = currentX - initialX;
                int offsetY = currentY - initialY;

                // 更新矩形的位置 
                rectangle.setLocation(rectangle.x + offsetX, rectangle.y + offsetY);

                // 重绘窗口 
                repaint();

                // 更新初始位置 
                initialX = currentX;
                initialY = currentY;
            }
        });
    }

    @Override
    public void paint(Graphics g) {super.paint(g);

        // 绘制矩形 
        g.fillRect(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
    }

    public static void main(String[] args) {SwingUtilities.invokeLater(() -> {DraggableRectangle draggableRectangle = new DraggableRectangle();
            draggableRectangle.setVisible(true);
        });
    }
}