Question

在我的程序中，我有以下代码：

package io.github.AdmiralSbs.DiceWars;

import javax.imageio.ImageIO;
import javax.swing.*;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Scanner;

public class HexDisplay extends JPanel {
    private static final long serialVersionUID = 1L;
    public static final int SIZE = 200;
    private int height;
    private int width;
    private Hex[][] hex;
    private BufferedImage myImage;
    private Graphics drawer;

    public HexDisplay(File f) throws IOException {
        Scanner key = new Scanner(f);
        int[] temp = commaSplit(key.nextLine());
        height = temp[0];
        width = temp[1];
        hex = new Hex[width][height];
        for (int w = 0; w < width; w++) {
            for (int h = 0; h < height; h++) {
                //temp = commaSplit(key.nextLine());
                if (h % 2 == 0)
                    hex[w][h] = new Hex((int) (SIZE * (w + 0.5)),
                            (int) (SIZE * (h + 0.5)), SIZE);
                else
                    hex[w][h] = new Hex((int) (SIZE * (w + 1.5)),
                            (int) (SIZE * (h + 0.5)), SIZE);
                System.out.println(hex[w][h].getX() + " " + hex[w][h].getY());
            }
        }
        key.close();
        starting();
        ImageIO.write(myImage, "jpg", new File("outPic.jpg"));
    }

    public void starting() {
        setPreferredSize(new Dimension(400,400));
        setLayout(new FlowLayout());
        myImage = new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB);
        drawer = myImage.getGraphics();
        drawer.setColor(Color.BLUE);
        drawer.fillRect(0, 0, 400, 400);
        drawStuff(drawer);
        repaint();
    }

    public int[] commaSplit(String s) {
        String[] str = s.split(",");
        int[] ret = new int[str.length];
        for (int i = 0; i < str.length; i++) {
            ret[i] = Integer.parseInt(str[i]);
        }
        return ret;
    }

    public void paintComponents(Graphics g) {
        g.drawImage(myImage, 0, 0, this);
        System.out.println("Painted");
    }

    public void drawStuff(Graphics g) {
        for (int w = 0; w < width; w++) {
            for (int h = 0; h < height; h++) {
                hex[w][h].draw(g);
            }
        }
        System.out.println("Drew");
        revalidate();
        repaint();
        paintComponents(g);
    }
}

我期望发生的是包含此JPanel的帧显示图像，但事实并非如此。所有System.out.println（）方法都按预期调用，我可以将图像保存为.jpg文件。但是，图像不会显示在GUI中。可以做些什么？

Answer 1

你有一个错字：

paintComponent

应为super.paintComponent(g);。

并且应该包含对super方法的调用：

<ImageView
        android:id="@android:id/empty"
        android:layout_width="120sp"
        android:layout_height="130sp"
        android:layout_gravity="center"
        android:gravity="center"
        android:src="@drawable/flower" />

    <TextView
        android:id="@android:id/empty"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:paddingTop="120sp"
        android:text="Warning" />

    <TextView
        android:id="@android:id/empty"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:paddingTop="200sp"
        android:text="Click Me" />

作为方法的第一行

Java drawImage（）没有绘图

1 个答案: