Question

我不知道为什么要为WestPanel调用paintComponent，但是不能为East Panel工作......即使代码类似。请一些帮助。

     public class MyFrame extends JFrame{

        public static final int WIDTH = 1664;
        public static final int HEIGHT= 1088;
        public static final int TILE_W = 64;
        public static final int TILE_H = 64;
        private CenterPanel cP;
        private WestPanel wP;
        private EastPanel eP;
        /*private NorthPanel nP;
        private SouthPanel sP;*/



        public MyFrame(){

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setSize(WIDTH, HEIGHT);
            setTitle("Chuta");
            setResizable(false);
            setLocationRelativeTo(null);




            cP = new CenterPanel();
            add(cP, BorderLayout.CENTER);
            wP = new WestPanel();
            add(wP, BorderLayout.WEST);
            eP = new EastPanel();
            add(eP, BorderLayout.EAST);


            setVisible(true);
        }

        public static void main(String[] args) {

            MyFrame f = new MyFrame();
        }

这个西面板正在绘制包框架;

    import java.awt.BasicStroke;
    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import javax.swing.JPanel;
    import static frame.MyFrame.*;

    public class WestPanel extends JPanel {



        private int wCP;


        public WestPanel(){

            wCP=3*TILE_W;



            Dimension size = getPreferredSize();
            size.width = wCP;
            setPreferredSize(size);
            setBackground(new Color(0, 115, 102));

            new CardGrid(TILE_W/2);

        }

        @Override
        public void paintComponent(Graphics g){
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g;
            g2d.setStroke(new BasicStroke(5));
            g2d.setColor(Color.white);
            for (int y = TILE_H ; y < TILE_H*15; y+=TILE_H*3) {
                g2d.drawRect(TILE_W / 2, y, 120, TILE_H * 3);
            }


        }

此东面板未绘制

    import static frame.MyFrame.TILE_W;
    import static frame.MyFrame.TILE_H;
    import java.awt.BasicStroke;
    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import javax.swing.JPanel;

    public class EastPanel extends JPanel {

    private int eCP;


    public EastPanel(){

        eCP=3*TILE_W;
        Dimension size = getPreferredSize();
        size.width = eCP;
        setPreferredSize(size);
        setBackground(new Color(0, 112, 102));

        new CardGrid(MyFrame.WIDTH-120-TILE_W/2);


    }


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

        Graphics2D g2d = (Graphics2D) g;
        g2d.setStroke(new BasicStroke(5));
        g2d.setColor(Color.white);
        for (int y = TILE_H ; y < TILE_H*15; y+=TILE_H*3) {
            g2d.drawRect(MyFrame.WIDTH- 120 -TILE_W / 2, y, 120, TILE_H * 3);
        }
      }


   }

Answer 1

自动配置Graphics上下文，以便位置0x0代表组件的左上角

这意味着当您使用MyFrame.WIDTH - 120之类的东西时，您将在组件的可见边界之外进行绘画。

请记住，组件有自己的上下文区域0x0xwidthxheight。您不应该在组件中使用MyFrame.WIDTH

对于东面板，paintComponent不起作用，在West上是可以的

1 个答案: