因此，我正在做一些简单的游戏，我尝试在带有图像图标的标签上绘制矩形，但是当我尝试在框架上绘制某些东西时，没有任何效果，我尝试删除了带有图像图标的标签，但仍然无法在框架上绘制任何内容。
这是我的代码
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
@SuppressWarnings("serial")
public class Game extends JFrame{
JButton but1=new JButton("MakeMoney");
JButton button1=new JButton("Current money");
int money=0;
double currentMoney;
String moneyString="";
public static void main(String[] args){
new Game();
}
public Game(){
try {
this.setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("C:/Users/TPC/workspace/ProjectMoney/Resources/backgroundForApp.png")))));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
this.setLayout(new FlowLayout());
button1.setContentAreaFilled(false);
ListenForButton lforButton=new ListenForButton();
but1.addActionListener(lforButton);
JPanel thePanel=new JPanel();
thePanel.add(button1);
thePanel.add(but1);
this.setSize(1042, 617);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("Project Money");
this.add(thePanel);
this.add(new DrawStuff(), BorderLayout.CENTER);
this.setResizable(true);
this.setVisible(true);
Sound sound1=new Sound();
String sound = "file:C:/Users/TPC/Downloads/sound.wav";
sound1.playMusic(sound);
}
private class ListenForButton implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getSource()==but1){
money+=10;
moneyString=Integer.toString(money);
button1.setText("$"+moneyString);
}
}
}
private class DrawStuff extends JComponent{
public void paint(Graphics g){
Graphics2D graph2 = (Graphics2D)g;
graph2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Shape drawLine = new Line2D.Float(20, 90, 55, 250);
Shape drawArc2D = new Arc2D.Double(5, 150, 100, 100, 45, 180, Arc2D.OPEN);
Shape drawArc2D2 = new Arc2D.Double(5, 200, 100, 100, 45, 45, Arc2D.CHORD);
Shape drawArc2D3 = new Arc2D.Double(5, 250, 100, 100, 45, 45, Arc2D.PIE);
Shape drawEllipse = new Ellipse2D.Float(10, 10, 100, 100);
Shape drawRoundRec = new RoundRectangle2D.Double(25, 25, 50, 50, 45, 45);
CubicCurve2D cubicCurve = new CubicCurve2D.Double();
cubicCurve.setCurve(110, 50, 300,
200, 200, 200, 90, 263);
Shape drawRect = new Rectangle2D.Float(300, 300, 150, 100);
Shape drawQuadCurve = new QuadCurve2D.Float(300, 100, 400, 200, 150, 300);
Shape drawTransRect = new Rectangle2D.Double(300, 300, 75, 50);
graph2.setPaint(Color.BLACK);
graph2.draw(drawLine);
graph2.draw(drawArc2D);
graph2.draw(drawArc2D2);
graph2.draw(drawArc2D3);
graph2.draw(drawEllipse);
graph2.setColor(Color.GREEN);
graph2.fill(drawRoundRec);
graph2.fill(drawRect);
graph2.setPaint(Color.BLACK);
graph2.draw(cubicCurve);
graph2.draw(drawRect);
graph2.draw(drawQuadCurve);
graph2.fill(new Rectangle2D.Float(10, 10, 150, 100));
graph2.fill(drawTransRect);
}
}
}
最佳答案
使用paintComponent代替paint
调用super.paint（或将super.paintComponent设置为固定点一次）以保留绘画链
不要将JLabel用作背景组件，它不会遵循您的组件的首选大小，而只会考虑图标+标签文本的大小。
您正在为FlowLayout分配contentPane，但未为DrawStuff面板提供任何尺寸提示，这意味着当布局时，它将给出0x0的大小。尝试使用BorderLayout代替
例如...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Arc2D;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.QuadCurve2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Game extends JFrame {
JButton but1 = new JButton("MakeMoney");
JButton button1 = new JButton("Current money");
int money = 0;
double currentMoney;
String moneyString = "";
public static void main(String[] args) {
new Game();
}
public Game() {
try {
this.setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("C:/Users/TPC/workspace/ProjectMoney/Resources/backgroundForApp.png")))));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
this.setLayout(new BorderLayout());
button1.setContentAreaFilled(false);
ListenForButton lforButton = new ListenForButton();
but1.addActionListener(lforButton);
JPanel thePanel = new JPanel();
thePanel.add(button1);
thePanel.add(but1);
this.setSize(1042, 617);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("Project Money");
this.add(thePanel, BorderLayout.NORTH);
this.add(new DrawStuff(), BorderLayout.CENTER);
this.setResizable(true);
this.setVisible(true);
Sound sound1 = new Sound();
String sound = "file:C:/Users/TPC/Downloads/sound.wav";
sound1.playMusic(sound);
}
private class ListenForButton implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == but1) {
money += 10;
moneyString = Integer.toString(money);
button1.setText("$" + moneyString);
}
}
}
private class DrawStuff extends JComponent {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D graph2 = (Graphics2D) g;
graph2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Shape drawLine = new Line2D.Float(20, 90, 55, 250);
Shape drawArc2D = new Arc2D.Double(5, 150, 100, 100, 45, 180, Arc2D.OPEN);
Shape drawArc2D2 = new Arc2D.Double(5, 200, 100, 100, 45, 45, Arc2D.CHORD);
Shape drawArc2D3 = new Arc2D.Double(5, 250, 100, 100, 45, 45, Arc2D.PIE);
Shape drawEllipse = new Ellipse2D.Float(10, 10, 100, 100);
Shape drawRoundRec = new RoundRectangle2D.Double(25, 25, 50, 50, 45, 45);
CubicCurve2D cubicCurve = new CubicCurve2D.Double();
cubicCurve.setCurve(110, 50, 300,
200, 200, 200, 90, 263);
Shape drawRect = new Rectangle2D.Float(300, 300, 150, 100);
Shape drawQuadCurve = new QuadCurve2D.Float(300, 100, 400, 200, 150, 300);
Shape drawTransRect = new Rectangle2D.Double(300, 300, 75, 50);
graph2.setPaint(Color.BLACK);
graph2.draw(drawLine);
graph2.draw(drawArc2D);
graph2.draw(drawArc2D2);
graph2.draw(drawArc2D3);
graph2.draw(drawEllipse);
graph2.setColor(Color.GREEN);
graph2.fill(drawRoundRec);
graph2.fill(drawRect);
graph2.setPaint(Color.BLACK);
graph2.draw(cubicCurve);
graph2.draw(drawRect);
graph2.draw(drawQuadCurve);
graph2.fill(new Rectangle2D.Float(10, 10, 150, 100));
graph2.fill(drawTransRect);
}
}
}
学会从本地上下文而不是绝对上下文中加载资源，从长远来看，它将使您的生活变得更简单。 Retrieving Resources之类的
另外，请参阅Painting in AWT and Swing和Performing Custom Painting以获得有关绘画工作原理的更多详细信息
关于java - Java:无法在框架上绘制2D图形，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32192634/