Java面板/帧图形不起作用 [英] Java panel/frame graphic not working
本文介绍了Java面板/帧图形不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用Java Graphics进行人生模拟游戏，但是当运行我的代码时，屏幕的左边三分之一是灰色的。我希望整个屏幕都是白色，并用黑色方块表示生活广场。我对所有的java容器/面板和框架感到困惑。
这是我的代码：
公共类ConwayGame {
静态JPanel面板;
静态JFrame框架;
public static void main（String [] args）throws InterruptedException {
int [] [] array = new int [40] [40];
/ *
*通过操纵下面的数组，设置康威生命游戏的模式。
* /
/ *橡子
* /
数组[19] [15] = 1;
array [19] [16] = 1;
array [19] [19] = 1;
array [19] [20] = 1;
array [19] [21] = 1;
array [18] [18] = 1;
array [17] [16] = 1;
panel = new JPanel（）;
Dimension dim = new Dimension（400，400）;
panel.setPreferredSize（dim）;
frame = new JFrame（）;
frame.setSize（400,400）;
容器contentPane = frame.getContentPane（）;
contentPane.add（panel）;
frame.setVisible（true）;
/ *
*运行生命游戏模拟a次。
* /
图形g = panel.getGraphics（）;
drawArray（array，g）;
// paint（g）;
//Thread.sleep(125）;
//g.dispose（）;
}
/ *
*创建康威生命游戏的图形。
* /
public static void drawArray（int [] [] array，Graphics g）{
int BOX_DIM = 10;
for（int i = 0; i< array.length; i ++）{
for（int j = 0; j< array [0] .length; j ++）{
g .drawRect（i * BOX_DIM，j * BOX_DIM，10，10）;
if（array [i] [j] == 0）{
g.setColor（Color.WHITE）;
g.fillRect（i * BOX_DIM，j * BOX_DIM，10，10）;
}
if（array [i] [j] == 1）{
g.setColor（Color.BLACK）;
g.fillRect（i * BOX_DIM，j * BOX_DIM，10，10）;
}
}
}
}
}
下面是生成内容的图片：
$ b $不要使用
Graphics g = panel.getGraphics（）; EVER。这不是定制绘画在Swing中的工作原理。看看 import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
公共类ConwayGame {
静态JPanel面板;
静态JFrame框架;
public static void main（String [] args）throws InterruptedException {
int [] [] array = new int [40] [40];
array [19] [15] = 1;
array [19] [16] = 1;
array [19] [19] = 1;
array [19] [20] = 1;
array [19] [21] = 1;
array [18] [18] = 1;
array [17] [16] = 1;
panel = new JPanel（）{
@Override
public Dimension getPreferredSize（）{
return new Dimension（400，400）;
@Override
protected void paintComponent（Graphics g）{
super.paintComponent（g）;
drawArray（array，g）;
}
};
frame = new JFrame（）;
frame.add（panel）;
frame.pack（）;
frame.setVisible（true）;
}
/ *
*为Conway的生活游戏创建图形。
* /
public static void drawArray（int [] [] array，Graphics g）{
int BOX_DIM = 10;
for（int i = 0; i< array.length; i ++）{
for（int j = 0; j< array [0] .length; j ++）{
g .drawRect（i * BOX_DIM，j * BOX_DIM，10，10）;
if（array [i] [j] == 0）{
g.setColor（Color.WHITE）;
g.fillRect（i * BOX_DIM，j * BOX_DIM，10，10）;
}
if（array [i] [j] == 1）{
g.setColor（Color.BLACK）;
g.fillRect（i * BOX_DIM，j * BOX_DIM，10，10）;
}
}
}
}
}
现在，我将创建一个自定义组件，该组件从 JPanel 扩展，并将所有需要的逻辑放入该类中。
I am trying to make a game of life simulation using Java Graphics but when a run my code the left one third of the screen is grey.I want the whole screen to be white with black squares representing living squares. I am confused about all the java containers/panels and frames.
Here's my code:
public class ConwayGame {
static JPanel panel;
static JFrame frame;
public static void main(String[] args) throws InterruptedException{
int [][] array = new int [40][40];
/*
* Set the pattern for Conway's Game of Life by manipulating the array below.
*/
/*Acorn
*/
array[19][15]=1;
array[19][16]=1;
array[19][19]=1;
array[19][20]=1;
array[19][21]=1;
array[18][18]=1;
array[17][16]=1;
panel = new JPanel();
Dimension dim = new Dimension(400, 400);
panel.setPreferredSize(dim);
frame = new JFrame();
frame.setSize(400,400 );
Container contentPane = frame.getContentPane();
contentPane.add(panel);
frame.setVisible(true);
/*
* Runs the Game of Life simulation "a" number of times.
*/
Graphics g = panel.getGraphics();
drawArray(array, g);
//paint(g);
//Thread.sleep(125);
//g.dispose();
}
/*
* Creates the graphic for Conway's game of life.
*/
public static void drawArray(int[][] array, Graphics g) {
int BOX_DIM = 10;
for (int i = 0; i < array.length; i++) {
for (int j = 0; j < array[0].length; j++) {
g.drawRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
if (array[i][j] == 0) {
g.setColor(Color.WHITE);
g.fillRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
}
if (array[i][j] == 1) {
g.setColor(Color.BLACK);
g.fillRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
}
}
}
}
}
Here's a picture of what is generated:
解决方案
DON'T use Graphics g = panel.getGraphics(); EVER. This is not how custom painting works in Swing. Take a look at Painting in AWT and Swing and Performing Custom Painting for more details about how painting works
For example...
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ConwayGame {
static JPanel panel;
static JFrame frame;
public static void main(String[] args) throws InterruptedException {
int[][] array = new int[40][40];
array[19][15] = 1;
array[19][16] = 1;
array[19][19] = 1;
array[19][20] = 1;
array[19][21] = 1;
array[18][18] = 1;
array[17][16] = 1;
panel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
drawArray(array, g);
}
};
frame = new JFrame();
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
/*
* Creates the graphic for Conway's game of life.
*/
public static void drawArray(int[][] array, Graphics g) {
int BOX_DIM = 10;
for (int i = 0; i < array.length; i++) {
for (int j = 0; j < array[0].length; j++) {
g.drawRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
if (array[i][j] == 0) {
g.setColor(Color.WHITE);
g.fillRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
}
if (array[i][j] == 1) {
g.setColor(Color.BLACK);
g.fillRect(i * BOX_DIM, j * BOX_DIM, 10, 10);
}
}
}
}
}
Now, personally, I would create a custom component, which extended from JPanel and would place all the logic you needed into that class
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