我目前正在开发一个自助服务终端风格的Java程序,用于显示天气,时间,预测等。以下是程序应该的样子(在更新时间之前拍摄的截图)
将各个部分创建为JPanel,并覆盖paintComponent()
方法。它们绘制渐变标题和半透明背景。但是,当我更改其中一个面板的内容时,之前的内容会被遗忘,而不是被删除。示例如下所示:
正如你所看到的,当时间从11:51变为11:52时,数字重叠,背景变得更亮(因为半透明背景被重新绘制)
我该怎么做才能防止这种重叠?最终,当单个面板更新其内容时,我宁愿不必重绘整个屏幕。我宁愿只重绘那个特定的部分。重新绘制背景,然后是其中的所有组件将很容易。
有几个答案涉及清除要绘制的区域。无论我使用g.clear()
还是AlphaComposite.CLEAR
,它都会删除背景图片。这可以在下图中看到。也许如果我可以在清除区域之前复制背景,我可以重新绘制背景的那一部分,然后适当地分层其他图像。想法?
提交了一个答案,其中显示了一个完整的工作示例,该计时器放置在透明面板和背景上。这非常有用,但是,我不是手动绘制我的子组件。时间,天气图标和温度都是JLabel布局在半透明面板上。我宁愿不必手动绘制单个组件。
答案 0 :(得分:4)
类似的问题
image before http://img641.imageshack.us/img641/8873/translucentfail.png
已解决here
image after http://i46.tinypic.com/6gj1gk.png
另请注意,“Swing程序应覆盖paintComponent()
而不是覆盖paint()
。” - Painting in AWT and Swing: The Paint Methods。
答案 1 :(得分:3)
在进行绘画之前,请拨打g.clearRect(0,0,w,h)电话。 这将删除指定区域中的所有内容,并且您不会在上一帧的顶部绘制。
您可能希望应用一些双缓冲技术,因为屏幕会因清晰而略微闪烁。
答案 2 :(得分:3)
我把它放在一起很快就没什么特别了......
整个项目由JFrame,BackgroundImagePane和ClockPane
组成ClockPane看起来像这样(因为你可以重新创建其余部分;))
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.RoundRectangle2D;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.Timer;
public class ClockPane extends javax.swing.JPanel {
private Timer tick;
protected static final SimpleDateFormat SDF = new SimpleDateFormat("HH:mm.ss");
public ClockPane() {
setOpaque(false);
tick = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
repaint();
}
});
tick.setCoalesce(true);
tick.setRepeats(true);
setPreferredSize(new Dimension(100, 100));
setMinimumSize(new Dimension(100, 100));
}
@Override
public void addNotify() {
super.addNotify();
tick.start();
}
@Override
public void removeNotify() {
tick.stop();
super.removeNotify();
}
@Override
protected void paintComponent(Graphics grphcs) {
super.paintComponent(grphcs);
Graphics2D g2d = (Graphics2D) grphcs;
int width = getWidth() - 1;
int height = getHeight() - 1;
Color background = new Color(192, 192, 192, 128);
Color border = new Color(128, 128, 128);
RoundRectangle2D backing = new RoundRectangle2D.Float(0, 0, width, height, 20, 20);
g2d.setPaint(background);
g2d.fill(backing);
g2d.setPaint(border);
g2d.draw(backing);
String text = SDF.format(new Date());
FontMetrics fm = g2d.getFontMetrics();
g2d.setPaint(Color.BLACK);
int x = (width - fm.stringWidth(text)) / 2;
int y = ((height - fm.getHeight()) / 2) + fm.getAscent();
g2d.drawString(text, x, y);
}
}
有了这个,时钟每半秒左右更新一次,我对重绘
没有任何问题我能想到的唯一重要的是setOpaque(false);
<强>已更新强>
除了标签和面板之外,这个例子完全没有任何内容(背景窗格是一个自定义绘画作业,日期标签也有背景绘制,但除此之外)
现在,我把我一起砍了,所以它不如你的那么好,但是又一次,我没有得到报酬;)
import core.ui.UIUtilities;
import core.ui.WindowUtilities;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.Timer;
import javax.swing.UIManager;
public class MainFrame extends javax.swing.JFrame {
/**
* Creates new form MainFrame
*/
public MainFrame() {
setUndecorated(true);
WindowUtilities.setOpaque(this, false);
initComponents();
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
lblTime.setText(new SimpleDateFormat("hh:MM:ss").format(new Date()));
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
DateLabel label = new DateLabel();
label.init();
NewBackgroundPane backgroundPane = new NewBackgroundPane();
backgroundPane.setLayout(new BorderLayout());
backgroundPane.add(label, BorderLayout.NORTH);
backgroundPane.add(pnlMain);
add(backgroundPane, BorderLayout.CENTER);
pack();
setLocation(UIUtilities.centerOfDefaultScreen(this));
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
pnlMain = new javax.swing.JPanel();
jPanel2 = new javax.swing.JPanel();
lblTime = new javax.swing.JLabel();
lblExtTime = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jPanel4 = new javax.swing.JPanel();
jPanel5 = new javax.swing.JPanel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
jLabel13 = new javax.swing.JLabel();
jLabel14 = new javax.swing.JLabel();
jPanel6 = new javax.swing.JPanel();
jLabel15 = new javax.swing.JLabel();
jLabel16 = new javax.swing.JLabel();
jLabel17 = new javax.swing.JLabel();
jLabel18 = new javax.swing.JLabel();
jPanel7 = new javax.swing.JPanel();
jLabel19 = new javax.swing.JLabel();
jLabel20 = new javax.swing.JLabel();
jLabel21 = new javax.swing.JLabel();
jLabel22 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
pnlMain.setOpaque(false);
pnlMain.setLayout(new java.awt.GridBagLayout());
jPanel2.setOpaque(false);
jPanel2.setLayout(new java.awt.GridBagLayout());
lblTime.setFont(lblTime.getFont().deriveFont(lblTime.getFont().getStyle() | java.awt.Font.BOLD, lblTime.getFont().getSize()+18));
lblTime.setForeground(new java.awt.Color(255, 255, 255));
lblTime.setText("jLabel1");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
jPanel2.add(lblTime, gridBagConstraints);
lblExtTime.setFont(lblExtTime.getFont().deriveFont(lblExtTime.getFont().getSize()+6f));
lblExtTime.setForeground(new java.awt.Color(255, 255, 255));
lblExtTime.setText("AM EDT");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel2.add(lblExtTime, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
pnlMain.add(jPanel2, gridBagConstraints);
jPanel3.setOpaque(false);
jPanel3.setLayout(new java.awt.GridBagLayout());
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/transparentUpdate/Overcast.png"))); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridheight = 2;
jPanel3.add(jLabel3, gridBagConstraints);
jLabel4.setFont(jLabel4.getFont().deriveFont(jLabel4.getFont().getSize()+6f));
jLabel4.setForeground(new java.awt.Color(255, 255, 255));
jLabel4.setText("<html>Currenctly<br>Overast</html>");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.FIRST_LINE_START;
jPanel3.add(jLabel4, gridBagConstraints);
jLabel5.setFont(jLabel5.getFont().deriveFont(jLabel5.getFont().getSize()+12f));
jLabel5.setForeground(new java.awt.Color(255, 255, 255));
jLabel5.setText("69");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.LAST_LINE_START;
jPanel3.add(jLabel5, gridBagConstraints);
jLabel6.setForeground(new java.awt.Color(255, 255, 255));
jLabel6.setText("/65");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 2;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.LAST_LINE_START;
jPanel3.add(jLabel6, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 2;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
pnlMain.add(jPanel3, gridBagConstraints);
jPanel4.setOpaque(false);
jPanel4.setLayout(new java.awt.GridBagLayout());
jPanel5.setOpaque(false);
jPanel5.setLayout(new java.awt.GridBagLayout());
jLabel11.setFont(jLabel11.getFont().deriveFont(jLabel11.getFont().getSize()+4f));
jLabel11.setForeground(new java.awt.Color(255, 255, 255));
jLabel11.setText("Today");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
jPanel5.add(jLabel11, gridBagConstraints);
jLabel12.setForeground(new java.awt.Color(255, 255, 255));
jLabel12.setIcon(new javax.swing.ImageIcon(getClass().getResource("/transparentUpdate/SmallOvercast.png"))); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.gridheight = 2;
jPanel5.add(jLabel12, gridBagConstraints);
jLabel13.setFont(jLabel13.getFont().deriveFont(jLabel13.getFont().getSize()+4f));
jLabel13.setForeground(new java.awt.Color(255, 255, 255));
jLabel13.setText("83");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel5.add(jLabel13, gridBagConstraints);
jLabel14.setForeground(new java.awt.Color(255, 255, 255));
jLabel14.setText("65");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel5.add(jLabel14, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
gridBagConstraints.insets = new java.awt.Insets(2, 4, 2, 4);
jPanel4.add(jPanel5, gridBagConstraints);
jPanel6.setOpaque(false);
jPanel6.setLayout(new java.awt.GridBagLayout());
jLabel15.setFont(jLabel15.getFont().deriveFont(jLabel15.getFont().getSize()+4f));
jLabel15.setForeground(new java.awt.Color(255, 255, 255));
jLabel15.setText("Sunday");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
jPanel6.add(jLabel15, gridBagConstraints);
jLabel16.setForeground(new java.awt.Color(255, 255, 255));
jLabel16.setIcon(new javax.swing.ImageIcon(getClass().getResource("/transparentUpdate/Sunny.png"))); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.gridheight = 2;
jPanel6.add(jLabel16, gridBagConstraints);
jLabel17.setFont(jLabel17.getFont().deriveFont(jLabel17.getFont().getSize()+4f));
jLabel17.setForeground(new java.awt.Color(255, 255, 255));
jLabel17.setText("82");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel6.add(jLabel17, gridBagConstraints);
jLabel18.setForeground(new java.awt.Color(255, 255, 255));
jLabel18.setText("64");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel6.add(jLabel18, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 0;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
gridBagConstraints.insets = new java.awt.Insets(2, 4, 2, 4);
jPanel4.add(jPanel6, gridBagConstraints);
jPanel7.setOpaque(false);
jPanel7.setLayout(new java.awt.GridBagLayout());
jLabel19.setFont(jLabel19.getFont().deriveFont(jLabel19.getFont().getSize()+4f));
jLabel19.setForeground(new java.awt.Color(255, 255, 255));
jLabel19.setText("Monday");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
jPanel7.add(jLabel19, gridBagConstraints);
jLabel20.setForeground(new java.awt.Color(255, 255, 255));
jLabel20.setIcon(new javax.swing.ImageIcon(getClass().getResource("/transparentUpdate/Cloudy.png"))); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.gridheight = 2;
jPanel7.add(jLabel20, gridBagConstraints);
jLabel21.setFont(jLabel21.getFont().deriveFont(jLabel21.getFont().getSize()+4f));
jLabel21.setForeground(new java.awt.Color(255, 255, 255));
jLabel21.setText("83");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 1;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel7.add(jLabel21, gridBagConstraints);
jLabel22.setForeground(new java.awt.Color(255, 255, 255));
jLabel22.setText("84");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
jPanel7.add(jLabel22, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 2;
gridBagConstraints.gridy = 0;
gridBagConstraints.anchor = java.awt.GridBagConstraints.PAGE_START;
gridBagConstraints.insets = new java.awt.Insets(2, 4, 2, 4);
jPanel4.add(jPanel7, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 3;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
pnlMain.add(jPanel4, gridBagConstraints);
getContentPane().add(pnlMain, java.awt.BorderLayout.CENTER);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel14;
private javax.swing.JLabel jLabel15;
private javax.swing.JLabel jLabel16;
private javax.swing.JLabel jLabel17;
private javax.swing.JLabel jLabel18;
private javax.swing.JLabel jLabel19;
private javax.swing.JLabel jLabel20;
private javax.swing.JLabel jLabel21;
private javax.swing.JLabel jLabel22;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JPanel jPanel5;
private javax.swing.JPanel jPanel6;
private javax.swing.JPanel jPanel7;
private javax.swing.JLabel lblExtTime;
private javax.swing.JLabel lblTime;
private javax.swing.JPanel pnlMain;
// End of variables declaration
}
只是为了让生活变得更好,背景窗格
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
public class NewBackgroundPane extends javax.swing.JPanel {
/**
* Creates new form NewBackgroundPane
*/
public NewBackgroundPane() {
initComponents();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int width = getWidth() - 1;
int height = getHeight() - 1;
g2d.setColor(Color.LIGHT_GRAY);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));
g2d.fillRoundRect(0, 0, width, height, 20, 20);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setOpaque(false);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
}// </editor-fold>
// Variables declaration - do not modify
// End of variables declaration
}
如果你仍然无法让它工作,我能想到的唯一其他问题可能与全屏,独占模式有关,我没有测试过:P