背景为渐变色的窗体

水深无声 2024-02-18 18:28 12阅读 0赞

![20180303171618708][]

主类代码如下

package jpanel;
    
    import java.awt.EventQueue;
    
    import javax.swing.JFrame;
    
    public class ColorPanel {
    
    	private JFrame frame;
    
    	/**
    	 * Launch the application.
    	 */
    	public static void main(String[] args) {
    		EventQueue.invokeLater(new Runnable() {
    			public void run() {
    				try {
    					ColorPanel window = new ColorPanel();
    					window.frame.setVisible(true);
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});
    	}
    
    	/**
    	 * Create the application.
    	 */
    	public ColorPanel() {
    		initialize();
    	}
    
    	/**
    	 * Initialize the contents of the frame.
    	 */
    	private void initialize() {
    		frame = new JFrame();
    		frame.setBounds(100, 100, 450, 300);
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.getContentPane().setLayout(null);
    		
    		ShadePanel sPanel=new ShadePanel();
    		
    		sPanel.setBounds(0,0,432,253);
    		
    		frame.getContentPane().add(sPanel);
    	}
    }

重写的JPanel类代码如下

package jpanel;
    
    
    import java.awt.Color;
    import java.awt.GradientPaint;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    
    import javax.swing.JPanel;
    
    /**
     * 带背景的面板组件
     */
    public class ShadePanel extends JPanel {
        /**
         * 构造方法
         */
        public ShadePanel() {
            super();
            setLayout(null);
        }
        
        @Override
        protected void paintComponent(Graphics g1) {// 重写绘制组件外观
            Graphics2D g = (Graphics2D) g1;
            super.paintComponent(g);// 执行超类方法
            int width = getWidth();// 获取组件大小
            int height = getHeight();
            // 创建填充模式对象
            GradientPaint paint = new GradientPaint(0, 0, Color.CYAN, 0, height,
                    Color.MAGENTA);
            g.setPaint(paint);// 设置绘图对象的填充模式
            g.fillRect(0, 0, width, height);// 绘制矩形填充控件界面
        }
    }

[20180303171618708]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/ee1a097d0c83436db60c2e9ffad6b093.png