本文将向您解释“如何在Java swing应用程序中绘制聊天气泡?”
聊天气泡与呼出气泡或思想气泡相同。
今天,大多数聊天应用程序都以这种格式显示转换,因此本文将帮助您在用Java swing创建的桌面应用程序中进行相同的操作。
以下课程用于绘制第一个聊天气泡:(箭头位于气泡的左侧)
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JPanel;
/**
* @author harsh
*/
public class LeftArrowBubble extends JPanel {
private static final long serialVersionUID = -5389178141802153305L;
private int radius = 10;
private int arrowSize = 12;
private int strokeThickness = 3;
private int padding = strokeThickness / 2;
@Override
protected void paintComponent(final Graphics g) {
final Graphics2D g2d = (Graphics2D) g;
g2d.setColor(new Color(0.5f, 0.8f, 1f));
int x = padding + strokeThickness + arrowSize;
int width = getWidth() - arrowSize - (strokeThickness * 2);
int bottomLineY = getHeight() - strokeThickness;
g2d.fillRect(x, padding, width, bottomLineY);
g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
g2d.setStroke(new BasicStroke(strokeThickness));
RoundRectangle2D.Double rect = new RoundRectangle2D.Double(x, padding, width, bottomLineY, radius, radius);
Polygon arrow = new Polygon();
arrow.addPoint(20, 8);
arrow.addPoint(0, 10);
arrow.addPoint(20, 12);
Area area = new Area(rect);
area.add(new Area(arrow));
g2d.draw(area);
}
}
下面的代码是绘制第二个聊天气泡。 (箭头指向气泡的右侧):
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JPanel;
/**
* @author harsh
*/
public class RightArrowBubble extends JPanel {
private static final long serialVersionUID = -5389178141802153305L;
private int strokeThickness = 3;
private int radius = 10;
private int arrowSize = 12;
private int padding = strokeThickness / 2;
@Override
protected void paintComponent(final Graphics g) {
final Graphics2D g2d = (Graphics2D) g;
g2d.setColor(new Color(0.5f, 0.5f, 1f));
int bottomLineY = getHeight() - strokeThickness;
int width = getWidth() - arrowSize - (strokeThickness * 2);
g2d.fillRect(padding, padding, width, bottomLineY);
RoundRectangle2D.Double rect = new RoundRectangle2D.Double(padding, padding, width, bottomLineY, radius, radius);
Polygon arrow = new Polygon();
arrow.addPoint(width, 8);
arrow.addPoint(width + arrowSize, 10);
arrow.addPoint(width, 12);
Area area = new Area(rect);
area.add(new Area(arrow));
g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
g2d.setStroke(new BasicStroke(strokeThickness));
g2d.draw(area);
}
}
这是使用以上两个类的代码:
import java.awt.HeadlessException;
import .MalformedURLException;
import .URL;
import javax.swing.GroupLayout;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
* @author harsh
*/
public class TestPanel extends JPanel {
private static final long serialVersionUID = 9029457020704524363L;
private JLabel messageLbl1, userImageLbl1, messageLbl, userImageLbl;
private JPanel msgPanel1, msgPanel;
String userImageUrl = "/data/icons/nuvola2/22x22/apps/personal.png";
public TestPanel() throws MalformedURLException {
userImageLbl = new JLabel();
msgPanel = new LeftArrowBubble();
messageLbl = new JLabel();
messageLbl1 = new JLabel();
msgPanel1 = new RightArrowBubble();
userImageLbl1 = new JLabel();
userImageLbl.setIcon(new ImageIcon(new URL(userImageUrl)));
messageLbl.setText("Hi, How are you?");
GroupLayout msgPanelLayout = new GroupLayout(msgPanel);
msgPanel.setLayout(msgPanelLayout);
msgPanelLayout.setHorizontalGroup(
msgPanelLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(msgPanelLayout.createSequentialGroup()
.addGap(21, 21, 21)
.addComponent(messageLbl)
.addContainerGap(162, Short.MAX_VALUE))
);
msgPanelLayout.setVerticalGroup(
msgPanelLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(msgPanelLayout.createSequentialGroup()
.addComponent(messageLbl)
.addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
messageLbl1.setIcon(new ImageIcon(new URL(userImageUrl)));
userImageLbl1.setText("I'm Good.");
GroupLayout jPanel1Layout = new GroupLayout(msgPanel1);
msgPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(171, Short.MAX_VALUE)
.addComponent(userImageLbl1)
.addGap(22, 22, 22))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(userImageLbl1)
.addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
GroupLayout layout = new GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(userImageLbl)
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
.addComponent(msgPanel1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(msgPanel, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addComponent(messageLbl1)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(userImageLbl)
.addComponent(msgPanel, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(messageLbl1)
.addComponent(msgPanel1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addContainerGap(22, Short.MAX_VALUE))
);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
JOptionPane.showMessageDialog(null, new TestPanel());
} catch (HeadlessException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
});
}
}
参考: harryjoy博客上来自我们JCG合作伙伴 Harsh Raval的java swing中的聊天气泡 。