昆明微网站,西安大雁塔在哪个区,做外贸网站有哪些,同城58找房子租房信息这是一个非常基本的例子.它使用一个图像文件并将其放置在一个滚动窗格内(在一个圆形的方式).从那里,它只是使用Swing Timer来随机生成点(在图像的边界内).每次生成一个新点时,我只需使用scrollToRectVisible,传递它想要渲染的点的位置和大小.这将确保新点(和点)在滚动窗格中可见…这是一个非常基本的例子.它使用一个图像文件并将其放置在一个滚动窗格内(在一个圆形的方式).从那里,它只是使用Swing Timer来随机生成点(在图像的边界内).每次生成一个新点时,我只需使用scrollToRectVisible,传递它想要渲染的点的位置和大小.这将确保新点(和点)在滚动窗格中可见.import java.awt.Color;import java.awt.EventQueue;import java.awt.FontMetrics;import java.awt.Graphics;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Point;import java.awt.Rectangle;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.imageio.ImageIO;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JLayeredPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.Timer;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;import javax.swing.border.LineBorder;public class ScrollTest {public static void main(String[] args) {new ScrollTest();}private JScrollPane scrollPane;private DesktopPane desktopPane;public ScrollTest() {EventQueue.invokeLater(new Runnable() {Overridepublic void run() {try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {ex.printStackTrace();}try {desktopPane new DesktopPane();scrollPane new JScrollPane(desktopPane);JFrame frame new JFrame(Testing);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.add(scrollPane);frame.setSize(desktopPane.getPreferredSize().width / 2, desktopPane.getPreferredSize().height / 2);frame.setLocationRelativeTo(null);frame.setVisible(true);} catch (IOException exp) {exp.printStackTrace();}}});}public class DesktopPane extends JLayeredPane {private List points;public DesktopPane() throws IOException {points new ArrayList(25);final BufferedImage img ImageIO.read(new File(Desktop.jpg));final JLabel desktop new JLabel(new ImageIcon(img));final JPanel overlay new JPanel() {Overrideprotected void paintComponent(Graphics g) {super.paintComponent(g);int xOff desktop.getX();int yOff desktop.getY();int count 0;FontMetrics fm g.getFontMetrics();int height fm.getHeight();for (Point p : points) {g.setColor(Color.RED);String text Integer.toString(count);int width fm.stringWidth(text);int radius Math.max(width, height) 5;int x xOff p.x - radius / 2;int y yOff p.y - radius / 2;g.fillOval(x, y, radius, radius);g.setColor(Color.WHITE);x (radius - width) / 2;y ((radius - height) / 2) fm.getAscent();g.drawString(text, x, y);}}};overlay.setOpaque(false);setLayout(new GridBagLayout());GridBagConstraints gbc new GridBagConstraints();gbc.gridx 0;gbc.gridy 0;gbc.weightx 1;gbc.weighty 1;gbc.fill GridBagConstraints.BOTH;add(desktop, gbc);add(overlay, gbc);setLayer(desktop, 0);setLayer(overlay, 5);overlay.setBorder(new LineBorder(Color.RED));Timer timer new Timer(1000, new ActionListener() {Overridepublic void actionPerformed(ActionEvent e) {int x (int) Math.round(Math.random() * img.getWidth());int y (int) Math.round(Math.random() * img.getHeight());points.add(new Point(x, y));repaint();FontMetrics fm getFontMetrics(overlay.getFont());int height fm.getHeight();String text Integer.toString(points.size() - 1);int width fm.stringWidth(text);int radius Math.max(width, height) 5;scrollRectToVisible(new Rectangle(x - radius / 2, y - radius / 2, radius, radius));}});timer.start();}}}现在,如果要将点显示为尽可能靠近中心,则需要额外的工作……现在,如果你真的想玩得开心,可以将延迟设置为50-100毫秒;)
