我有一个有四层的JLayeredPane：
出于某种原因，如果我更改第3层中标签的背景颜色然后绘制到第4层，则第3层中的标签将绘制在第4层绘制的图形上。我试图在各种颜色上设置ignoreRepaint（）组件以及不透明和代码结构，但都无济于事 有谁知道如何防止这种情况发生？
我不会附加源代码，因为项目非常大但是我附加了一个独立程序运行的示例，当你点击＆＃34;添加箭头＆＃时显示我的问题34;按钮。
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;
public class GraphicsTest {
@SuppressWarnings("serial")
class Painter extends JComponent {
public Painter(int x, int y) {
setBounds(0, 0, x, y);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
}
}
private static final int CELL_SIZE = 40;
private static final int NOTE_SIZE = 20;
private JFrame frame;
private static JButton test;
private static JButton clear;
private static JLayeredPane pane = new JLayeredPane();
private static JPanel back = new JPanel();
private static JPanel[][] cellPanels = new JPanel[10][10];
private static JLabel[][] cells = new JLabel[10][10];
private static JPanel[][] notePanels = new JPanel[10][10];
private static JLabel[][][] notes = new JLabel[10][10][4];
private static Painter painter;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
GraphicsTest window = new GraphicsTest();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public GraphicsTest() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setSize(600, 700);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(null);
pane.setBounds(50, 50, 500, 500);
pane.setLayout(null);
frame.getContentPane().add(pane);
back.setBounds(0, 0, 500, 500);
back.setBackground(Color.BLACK);
pane.add(back, new Integer(100));
for (int i = 0; i < 10; i++) {
for (int k = 0; k < 10; k++) {
String text = "";
if ((i % 2) == 1 && (k % 2) == 1) text = (i + k) + "";
cellPanels[i][k] = new JPanel();
cellPanels[i][k].setBounds(k * CELL_SIZE, i * CELL_SIZE, CELL_SIZE, CELL_SIZE);
cellPanels[i][k].setBackground(Color.WHITE);
cellPanels[i][k].setBorder(new LineBorder(Color.BLACK, 1));
cells[i][k] = new JLabel(text);
cells[i][k].setBounds(0, 0, CELL_SIZE, CELL_SIZE);
cells[i][k].setOpaque(false);
cellPanels[i][k].add(cells[i][k]);
pane.add(cellPanels[i][k], new Integer(200));
}
}
boolean display;
for (int i = 0; i < 10; i++) {
for (int k = 0; k < 10; k++) {
if ((i % 2) == 0 && (k % 2) == 0) {
display = true;
} else {
display = false;
}
notePanels[i][k] = new JPanel();
notePanels[i][k].setBounds(k * CELL_SIZE, i * CELL_SIZE, CELL_SIZE, CELL_SIZE);
notePanels[i][k].setBackground(Color.WHITE);
notePanels[i][k].setBorder(new LineBorder(Color.BLACK, 1));
notePanels[i][k].setLayout(null);
for (int m = 0; m < 2; m++) {
for (int p = 0; p < 2; p++) {
notes[i][k][(m * 2) + p] = new JLabel(30 + "");
notes[i][k][(m * 2) + p].setBounds(m * NOTE_SIZE, p * NOTE_SIZE, NOTE_SIZE, NOTE_SIZE);
notes[i][k][(m * 2) + p].setOpaque(true);
notePanels[i][k].add(notes[i][k][(m * 2) + p]);
}
}
if (display) {
notePanels[i][k].setVisible(true);
} else {
notePanels[i][k].setVisible(false);
}
pane.add(notePanels[i][k], new Integer(300));
}
}
painter = new Painter(500, 500);
pane.add(painter, new Integer(400));
test = new JButton("Add Arrow");
test.setBounds(50, 600, 100, 25);
test.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
highlightNotes();
Arrow.drawArrow(painter.getGraphics(), 20, 20, 400, 400, 20, 30, 40, Color.BLACK, Color.GREEN);
}
});
frame.getContentPane().add(test);
clear = new JButton("Clear");
clear.setBounds(175, 600, 100, 25);
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
painter.repaint();
}
});
frame.getContentPane().add(clear);
}
private static void highlightNotes() {
for (int i = 0; i < 10; i++) {
for (int k = 0; k < 10; k++) {
for (int n = 0; n < 4; n++) {
notes[i][k][n].setBackground(Color.BLUE);
}
}
}
}
static class Arrow {
public static void drawArrow(Graphics g, int tailx, int taily, int headx, int heady,
int shaftw, int headw, int headh, Color outline, Color fill) {
if ((shaftw % 2) == 0) {
shaftw--;
}
if ((headw % 2) == 0) {
headw--;
}
if ((headh % 2) == 0) {
headh--;
}
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
double length = Math.sqrt((double) (((headx - tailx) * (headx - tailx))
+ ((heady - taily) * (heady - taily))));
int tailLength = (int) (length - headw) + 1;
double theta = Math.atan2(heady - taily, headx - tailx);
Point point1 = new Point(0, -(shaftw / 2));
point1 = getTransPoint(point1, theta);
point1.x += tailx;
point1.y += taily;
Point point2 = new Point(tailLength, -(shaftw / 2));
point2 = getTransPoint(point2, theta);
point2.x += tailx;
point2.y += taily;
Point point3 = new Point(tailLength, -(headw / 2));
point3 = getTransPoint(point3, theta);
point3.x += tailx;
point3.y += taily;
Point point4 = new Point((int) length, 0);
point4 = getTransPoint(point4, theta);
point4.x += tailx;
point4.y += taily;
Point point5 = new Point(tailLength, (headw / 2));
point5 = getTransPoint(point5, theta);
point5.x += tailx;
point5.y += taily;
Point point6 = new Point(tailLength, (shaftw / 2));
point6 = getTransPoint(point6, theta);
point6.x += tailx;
point6.y += taily;
Point point7 = new Point(0, (shaftw / 2));
point7 = getTransPoint(point7, theta);
point7.x += tailx;
point7.y += taily;
//Create arrow at tail coordinates passed in
Polygon arrow = new Polygon();
arrow.addPoint(point1.x, point1.y);
arrow.addPoint(point2.x, point2.y);
arrow.addPoint(point3.x, point3.y);
arrow.addPoint(point4.x, point4.y);
arrow.addPoint(point5.x, point5.y);
arrow.addPoint(point6.x, point6.y);
arrow.addPoint(point7.x, point7.y);
//Draw and fill the arrow
g2.setColor(fill);
g2.fillPolygon(arrow);
g2.setColor(outline);
g2.drawPolygon(arrow);
}
private static Point getTransPoint(Point point, double theta) {
int x = (int) ((point.x * Math.cos(theta)) - (point.y * Math.sin(theta)));
int y = (int) ((point.y * Math.cos(theta)) + (point.x * Math.sin(theta)));
return new Point(x, y);
}
}
}