Java 如何在 Jpanel 上绘画？
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How to paint on a Jpanel?
提问by
i am trying to add 2 different panels in a Frame. one panel adds few buttons in the frame. others frame will add a chess board into the frame. i am confused, how to draw this board on a panel. my Frame will have a board on the top and buttons at the bottom. Moreover, let me know if i am somewhere wrong in the given code can anybody help me? my Code is
我想在一个框架中添加 2 个不同的面板。一个面板在框架中添加了几个按钮。其他框架将在框架中添加一个棋盘。我很困惑，如何在面板上绘制此板。我的 Frame 顶部有一块板，底部有按钮。此外，如果我在给定的代码中出现错误，请告诉我有人可以帮助我吗？我的代码是
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
private JFrame main;
private JPanel board;
private JPanel buttons;
private JButton add;
private JButton delete;
public Test()
{
main=new JFrame();
board=new JPanel();
buttons=new JPanel();
add=new JButton("Add");
delete=new JButton("Delete");
init();
addButtons();
}
public void init()
{
main.setSize(700,700);
main.setVisible(true);
main.setDefaultCloseOperation(main.EXIT_ON_CLOSE);
}
public void addButtons()
{
buttons.setSize(700,40);
buttons.setLayout(new FlowLayout());
buttons.add(add);
buttons.add(delete);
main.add(buttons,BorderLayout.SOUTH);
}
public void addBoxes()
{
// what should be my code here...??
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new Test();
}
}
采纳答案by Paul Samsotha
- You need a component to paint on, like a
JPanel. - You need to @Override its
paintComponentmethod - You can use a loop to paint using
Graphicscontext - Use a flag to alternate between colors.
- 您需要一个要在其上绘画的组件，例如
JPanel. - 你需要@Override它的
paintComponent方法 - 您可以使用循环来使用
Graphics上下文进行绘制 - 使用标志在颜色之间交替。
Take a look at some Painting Graphics tutorials
看看一些绘画图形教程
In the mean time, give this a whirl
与此同时，试一试
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Board extends JPanel {
private static final int DIM_WIDTH = 640;
private static final int DIM_HEIGHT = 640;
private static final int SQ_SIZE = 80;
boolean black = true;
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i = 0; i < DIM_HEIGHT; i += SQ_SIZE) {
if (black) {
black = false;
} else {
black = true;
}
for (int j = 0; j < DIM_WIDTH; j += SQ_SIZE) {
if (black) {
g.setColor(Color.WHITE);
g.fillRect(j, i, SQ_SIZE, SQ_SIZE);
black = false;
} else {
g.setColor(Color.BLACK);
g.fillRect(j, i, SQ_SIZE, SQ_SIZE);
black = true;
}
}
}
}
public static void createAndShowGui() {
JFrame frame = new JFrame();
frame.add(new Board());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
frame.pack();
frame.setVisible(true);
}
public Dimension getPreferredSize() {
return new Dimension(DIM_WIDTH, DIM_HEIGHT);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
