在JFrame中绘制网格
我现在有一个9x9网格的按钮，我想在这些按钮之间绘制一些线来分隔它们并制作3x3网格。
我在另一个窗口的JPanel中尝试了我的方法，它工作正常，但是我无法在我的JFrame旁边按下按钮，因为它什么都没画。 每个按钮之间已经有一些空间，所以我们可以看到它在那里的线。
非常感谢您将来的帮助。
以下是代码：
import javax.swing.*;
import java.awt.*;
public class ButtonGrid extends JPanel{
JFrame frame=new JFrame();
int t = 9;
public ButtonGrid(){ //constructor
frame.setLayout(new GridLayout(t, t, 3, 3));
addButtons(frame, t);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
@Override public void paint(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLACK);
for (int i = 0; i <= 9; i++) {
if (i % 3 == 0) {
int coord = i * 58;
coord++;
g.drawLine(coord, 0, coord, 58*9);
g.drawLine(0, coord, 58*9, coord);
}
}
}
private void addButtons(JFrame frame, int t){
JButton grid;
for(int y=0; y<t; y++){
for(int x=0; x<t; x++){
grid=new JButton(x+","+y); //creates new button
grid.setPreferredSize(new Dimension(55,55));
frame.add(grid); //adds button to grid
}
}
}
public static void main(String[] args) {
new ButtonGrid();
}
}
2 个答案:
答案 0 :(得分：5)
不要像你想要的那样直接在JFrame上绘图。如果您不知道自己在做什么（例如，您没有调用超级的绘画方法并且无意中以这种方式打破绘画链），则会带来很大的风险，并且绘制的图像将不会显示为由不透明的contentPane覆盖。
如果需要绘制，请在JPFnel中进行绘制，然后在JFrame中显示，但是再次按照下面的示例，如果您想要的只是网格中的黑色直线，则无需绘制。
使用GridLayout，并在布局中设置一些间隙。理解GridLayout构造函数的第3和第4个参数将为您提供空白。然后给基础JPanel一个Color.BLACK背景，你去吧：行！例如，使用JTextFields：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class SudokuMCVE extends JPanel {
private static final int CLUSTER = 3;
private static final int MAX_ROWS = 9;
private static final float FIELD_PTS = 32f;
private static final int GAP = 3;
private static final Color BG = Color.BLACK;
private static final Color SOLVED_BG = Color.LIGHT_GRAY;
public static final int TIMER_DELAY = 2 * 1000;
private JTextField[][] fieldGrid = new JTextField[MAX_ROWS][MAX_ROWS];
public SudokuMCVE() {
JPanel mainPanel = new JPanel(new GridLayout(CLUSTER, CLUSTER));
mainPanel.setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
mainPanel.setBackground(BG);
JPanel[][] panels = new JPanel[CLUSTER][CLUSTER];
for (int i = 0; i < panels.length; i++) {
for (int j = 0; j < panels[i].length; j++) {
panels[i][j] = new JPanel(new GridLayout(CLUSTER, CLUSTER, 1, 1));
panels[i][j].setBackground(BG);
panels[i][j].setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
mainPanel.add(panels[i][j]);
}
}
for (int row = 0; row < fieldGrid.length; row++) {
for (int col = 0; col < fieldGrid[row].length; col++) {
fieldGrid[row][col] = createField(row, col);
int i = row / 3;
int j = col / 3;
panels[i][j].add(fieldGrid[row][col]);
}
}
setLayout(new BorderLayout());
add(mainPanel, BorderLayout.CENTER);
add(new JButton(new SolveAction("Solve")), BorderLayout.PAGE_END);
}
private JTextField createField(int row, int col) {
JTextField field = new JTextField(2);
field.setHorizontalAlignment(JTextField.CENTER);
field.setFont(field.getFont().deriveFont(Font.BOLD, FIELD_PTS));
return field;
}
private class SolveAction extends AbstractAction {
public SolveAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
new Timer(TIMER_DELAY, new ActionListener() {
private int i = 0;
private int j = 0;
@Override
public void actionPerformed(ActionEvent e) {
// MAX_ROWS is 9
if (i == MAX_ROWS) {
((Timer) e.getSource()).stop();
}
if (j == MAX_ROWS) {
i++;
j = 0;
}
int number = (int) (MAX_ROWS * Math.random()) + 1;
fieldGrid[i][j].setBackground(SOLVED_BG);
fieldGrid[i][j].setText(String.valueOf(number));
j++;
}
}).start();
}
}
private static void createAndShowGui() {
SudokuMCVE mainPanel = new SudokuMCVE();
JFrame frame = new JFrame("SudokuMCVE");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
显示为：
或者使用JButtons：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.*;
@SuppressWarnings("serial")
public class JPanelGrid extends JPanel {
private static final int SML_SIDE = 3;
private static final int SIDE = SML_SIDE * SML_SIDE;
private static final int GAP = 3;
private static final Color BG = Color.BLACK;
private static final Dimension BTN_PREF_SIZE = new Dimension(80, 80);
private JButton[][] buttons = new JButton[SIDE][SIDE];
public JPanelGrid() {
setBackground(BG);
setLayout(new GridLayout(SML_SIDE, SML_SIDE, GAP, GAP));
setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
JPanel[][] smallPanels = new JPanel[SML_SIDE][SML_SIDE];
for (int i = 0; i < smallPanels.length; i++) {
for (int j = 0; j < smallPanels[i].length; j++) {
smallPanels[i][j] = new JPanel(new GridLayout(SML_SIDE, SML_SIDE));
add(smallPanels[i][j]);
}
}
for (int i = 0; i < buttons.length; i++) {
int panelI = i / SML_SIDE;
for (int j = 0; j < buttons[i].length; j++) {
int panelJ = j / SML_SIDE;
String text = String.format("[%d, %d]", j, i);
buttons[i][j] = new JButton(text);
buttons[i][j].setPreferredSize(BTN_PREF_SIZE);
smallPanels[panelI][panelJ].add(buttons[i][j]);
}
}
}
private static void createAndShowGui() {
JPanelGrid mainPanel = new JPanelGrid();
JFrame frame = new JFrame("JPanelGrid");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
显示：
答案 1 :(得分：0)
我在你的代码中进行了这些最小的修改，
- 向面板添加按钮（不是框架）
- 将面板设置为框架的内容窗格
- 使用paintComponent更改方法super.paintComponent，并在方法正文中首先调用import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ButtonGrid extends JPanel {
JFrame frame = new JFrame();
int t = 9;
public ButtonGrid() { // constructor
frame.setContentPane(this);
setLayout(new GridLayout(t, t, 3, 3));
addButtons(t);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
// g.setColor(getBackground());
// g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.RED);
for (int i = 0; i <= 9; i++) {
if (i % 3 == 0) {
int coordx = getWidth() * i / 9;
int coordy = getHeight() * i / 9;
g.drawLine(coordx, 0, coordx, getHeight());
g.drawLine(0, coordy, getWidth(), coordy);
}
}
}
private void addButtons(int t) {
JButton grid;
for (int y = 0; y < t; y++) {
for (int x = 0; x < t; x++) {
grid = new JButton(x + "," + y); // creates new button
grid.setPreferredSize(new Dimension(55, 55));
add(grid); // adds button to grid
}
}
}
public static void main(String[] args) {
new ButtonGrid();
}
}
- 并更改线坐标计算
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