我正在试图将JLabel添加到我的健康栏上,该栏是由红色矩形顶部的绿色矩形模拟的。尽管我声明了一个JLabel并将其附加到我的rectangleComponent,但它永远不会显示出来。有任何想法吗? 这是我的rectangleComponent和它被初始化的Frame。在Java中,如何将JLabel添加到矩形?
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JLabel;
public class RectangleComponent extends JComponent
{
private Color color;
private int width;
private int height;
private int origWidth;
private JLabel label;
private Rectangle2D rectangle;
private boolean wantLabel;
private int xCoord;
private int yCoord;
public RectangleComponent(int x, int y, Color color, int width, int height, boolean wantLabel)
{
this.width = width;
this.height = height;
this.color = color;
origWidth = width;
xCoord = x;
yCoord = y;
this.wantLabel = wantLabel;
if(wantLabel)
{
label = new JLabel(this.width + "/" + origWidth);
label.setLabelFor(this);
}
setBounds(xCoord, yCoord, width, height);
rectangle = new Rectangle2D.Float(xCoord, yCoord, width, height);
}
public RectangleComponent(int x, int y, Color color, boolean wantLabel)
{
width = 125;
height = 18;
xCoord = x;
yCoord = y;
this.color = color;
origWidth = width;
this.wantLabel = wantLabel;
if(wantLabel)
{
label = new JLabel(this.width + "/" + origWidth);
label.setLabelFor(this);
}
setBounds(xCoord, yCoord, width, height);
rectangle = new Rectangle2D.Float(xCoord, yCoord, width, height);
}
public void paintComponent(Graphics g)
{
Graphics2D graphics2 = (Graphics2D) g;
rectangle = new Rectangle2D.Float(xCoord, yCoord, width, height);
graphics2.setPaint(color);
graphics2.fill(rectangle);
graphics2.draw(rectangle);
if(wantLabel)
label.setText(this.width + "/" + origWidth);
}
public Dimension getPreferredSize()
{
return (new Dimension(width, height));
}
public void subtractLife(int amount)
{
width -= amount;
if(width > 0)
{
rectangle.setRect(xCoord, yCoord, width, height);
repaint();
}
else
width = 0;
}
public void addLife(int amount)
{
width += amount;
if(width < origWidth)
{
rectangle.setRect(xCoord, yCoord, width, height);
repaint();
}
else width = origWidth;
}
}
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GameFrame extends JFrame
{
private SpellBarComponent bar;
private JPanel mainPanel = new JPanel();
private JPanel buttonPanel = new JPanel();
Color green = new Color(29, 180, 29);
Color red = new Color(255, 0, 0);
private RectangleComponent life;
private RectangleComponent death;
public GameFrame(char x)
{
setSize(1024, 768);
setTitle("Game");
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
mainPanel.setLayout(null);
createPanels(x);
buttonPanel.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));
repaint();
getContentPane().add(mainPanel, BorderLayout.CENTER);
getContentPane().add(buttonPanel, BorderLayout.PAGE_END);
setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH);
setLocationByPlatform(true);
life.subtractLife(10);
setVisible(true);
}
public RectangleComponent getLife()
{
return life;
}
private void createHealth()
{
life = new RectangleComponent(0, 0, green, true);
death = new RectangleComponent(0, 0, red, true);
}
private void createPanels(char x)
{
createBar(x);
createHealth();
mainPanel.add(buttonPanel);
mainPanel.add(life);
mainPanel.add(death);
buttonPanel.add(bar.getSpell1());
buttonPanel.add(bar.getSpell2());
buttonPanel.add(bar.getSpell3());
}
private void createBar(char x)
{
bar = new SpellBarComponent(x);
}
}
我打电话给label.setLabelFor(这个),我认为它加了。在我的构造函数中为RectangleComponent调用add(label)并不能解决问题。 – keyert 2012-04-26 20:47:11
@keyert这是因为您扩展了JComponent而没有设置标签边界或设置LayoutManager。你的标签可能有一个宽度和高度为0. RectangleComponent可以扩展JPanel。此外,设置setLabelFor不会将标签添加到组件,这仅用于助记符:http://docs.oracle.com/javase/7/docs/api/javax/swing/JLabel.html#setLabelFor(java。 awt.Component)。最后,不是使用布尔标志来显示或不使用标签,而是使用标签上的setVisible。 – 2012-04-26 22:16:37