fork(2) download 
  1. import java.awt.BorderLayout;
  2. import java.awt.Color;
  3. import java.awt.Dimension;
  4. import java.awt.EventQueue;
  5. import java.awt.Graphics;
  6. import java.awt.Graphics2D;
  7. import java.awt.Point;
  8. import java.awt.RenderingHints;
  9. import java.awt.event.MouseAdapter;
  10. import java.awt.event.MouseEvent;
  11. import java.util.*;
  12. import javax.swing.*;
  13.  
  14. class SimpleBalls {
  15.  
  16. 	private Point mousePoint;
  17.  
  18. 	public static void main(String[] args) {
  19. 		new SimpleBalls();
  20. 	}
  21.  
  22. 	public SimpleBalls() {
  23. 		EventQueue.invokeLater(new Runnable() {
  24. 			@Override
  25. 			public void run() {
  26. 				try {
  27. 					UIManager.setLookAndFeel(UIManager
  28. 							.getSystemLookAndFeelClassName());
  29. 				} catch (ClassNotFoundException ex) {
  30. 				} catch (InstantiationException ex) {
  31. 				} catch (IllegalAccessException ex) {
  32. 				} catch (UnsupportedLookAndFeelException ex) {
  33. 				}
  34.  
  35. 				JFrame frame = new JFrame("Spot");
  36. 				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  37. 				frame.setLayout(new BorderLayout());
  38. 				Balls balls = new Balls();
  39. 				frame.add(balls);
  40. 				frame.setSize(400, 400);
  41. 				frame.setVisible(true);
  42.  
  43. 				new Thread(new BounceEngine(balls)).start();
  44.  
  45. 			}
  46. 		});
  47. 	}
  48.  
  49. 	public static int random(int maxRange) {
  50. 		return (int) Math.round((Math.random() * maxRange));
  51. 	}
  52.  
  53. 	public class Balls extends JPanel {
  54.  
  55. 		private List<Ball> ballsUp;
  56.  
  57. 		public Balls() {
  58. 			ballsUp = new ArrayList<Ball>(25);
  59.  
  60. 			MouseAdapter handler = new MouseAdapter() {
  61.  
  62. 				@Override
  63. 				public void mouseMoved(MouseEvent e) {
  64. 					mousePoint = e.getPoint();
  65. 					// System.out.println(mousePoint);
  66. 				}
  67.  
  68. 				@Override
  69. 				public void mouseExited(MouseEvent e) {
  70. 					mousePoint = null;
  71. 				}
  72.  
  73. 			};
  74.  
  75. 			addMouseListener(handler);
  76. 			addMouseMotionListener(handler);
  77.  
  78. 			for (int index = 0; index < 10 + random(10); index++) {
  79. 				ballsUp.add(new Ball(new Color(random(255), random(255),
  80. 						random(255))));
  81. 			}
  82.  
  83. 		}
  84.  
  85. 		@Override
  86. 		protected void paintComponent(Graphics g) {
  87. 			super.paintComponent(g);
  88. 			Graphics2D g2d = (Graphics2D) g.create();
  89. 			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
  90. 					RenderingHints.VALUE_ANTIALIAS_ON);
  91. 			for (Ball ball : ballsUp) {
  92. 				ball.paint(g2d);
  93. 			}
  94. 			g2d.dispose();
  95. 		}
  96.  
  97. 		public List<Ball> getBalls() {
  98. 			return ballsUp;
  99. 		}
  100. 	}
  101.  
  102. 	public class BounceEngine implements Runnable {
  103.  
  104. 		private Balls parent;
  105.  
  106. 		public BounceEngine(Balls parent) {
  107. 			this.parent = parent;
  108. 		}
  109.  
  110. 		@Override
  111. 		public void run() {
  112.  
  113. 			int width = getParent().getWidth();
  114. 			int height = getParent().getHeight();
  115.  
  116. 			for (Ball ball : getParent().getBalls()) {
  117. 				int x = random(width);
  118. 				int y = random(height);
  119.  
  120. 				Dimension size = ball.getSize();
  121.  
  122. 				if (x + size.width > width) {
  123. 					x = width - size.width;
  124. 				}
  125. 				if (y + size.height > height) {
  126. 					y = height - size.height;
  127. 				}
  128.  
  129. 				ball.setLocation(new Point(x, y));
  130.  
  131. 			}
  132.  
  133. 			while (getParent().isVisible()) {
  134.  
  135. 				SwingUtilities.invokeLater(new Runnable() {
  136. 					@Override
  137. 					public void run() {
  138. 						getParent().repaint();
  139. 					}
  140. 				});
  141.  
  142. 				for (Ball ball : getParent().getBalls()) {
  143. 					move(ball, mousePoint);
  144. 				}
  145.  
  146. 				// for (Ball ball : getParent().getBalls()) {
  147. 				// move(ball, mousePoint);
  148. 				// }
  149.  
  150. 				try {
  151. 					Thread.sleep(100);
  152. 				} catch (InterruptedException ex) {
  153. 					ex.printStackTrace();
  154. 				}
  155.  
  156. 			}
  157.  
  158. 		}
  159.  
  160. 		public Balls getParent() {
  161. 			return parent;
  162. 		}
  163.  
  164. 		public void move(Ball ball, Point mouse) {
  165.  
  166. 			try {
  167. 				Point p = ball.getLocation();
  168. 				Point speed = ball.getSpeed();
  169. 				Dimension size = ball.getSize();
  170.  
  171. 				int vx = speed.x;
  172. 				int vy = speed.y;
  173.  
  174. 				int x = p.x;
  175. 				int y = p.y;
  176.  
  177. 				// ----------------------
  178. 				if (mouse != null) {
  179.  
  180. 					int xDistance = Math.abs(x + size.width - mouse.x);
  181. 					int yDistance = Math.abs(y + size.height - mouse.y);
  182.  
  183. 					if (xDistance < yDistance) {
  184. 						if (x + size.width < mouse.x) {
  185. 							if (vx > 0) {
  186. 								vx *= -1;
  187. 							}
  188. 						} else {
  189. 							if (vx > 0) {
  190. 								vx *= -1;
  191. 							}
  192. 						}
  193. 					} else {
  194. 						if (y + size.height < mouse.y) {
  195. 							if (vy > 0) {
  196. 								vy *= -1;
  197. 							}
  198. 						} else {
  199. 							if (vy > 0) {
  200. 								vy *= -1;
  201. 							}
  202. 						}
  203. 					}
  204.  
  205. 				}
  206. 				// ----------------------
  207.  
  208. 				if (x + vx < 0 || x + size.width + vx > getParent().getWidth()) {
  209. 					vx *= -1;
  210. 				}
  211. 				if (y + vy < 0
  212. 						|| y + size.height + vy > getParent().getHeight()) {
  213. 					vy *= -1;
  214. 				}
  215. 				x += vx;
  216. 				y += vy;
  217.  
  218. 				ball.setSpeed(new Point(vx, vy));
  219. 				ball.setLocation(new Point(x, y));
  220.  
  221. 			} catch (Exception e) {
  222. 				e.printStackTrace();
  223. 			}
  224.  
  225. 		}
  226.  
  227. 	}
  228.  
  229. 	public class Ball {
  230.  
  231. 		private Color color;
  232. 		private Point location;
  233. 		private Dimension size;
  234. 		private Point speed;
  235. 		private int dimeter;
  236.  
  237. 		public Ball(Color color) {
  238. 			Random rnd = new Random();
  239. 			dimeter = 10 + rnd.nextInt(50);
  240.  
  241. 			setColor(color);
  242.  
  243. 			speed = new Point(10 - random(20), 10 - random(20));
  244. 			size = new Dimension(dimeter, dimeter);
  245.  
  246. 		}
  247.  
  248. 		public Dimension getSize() {
  249. 			return size;
  250. 		}
  251.  
  252. 		public void setColor(Color color) {
  253. 			this.color = color;
  254. 		}
  255.  
  256. 		public void setLocation(Point location) {
  257. 			this.location = location;
  258. 		}
  259.  
  260. 		public Color getColor() {
  261. 			return color;
  262. 		}
  263.  
  264. 		public Point getLocation() {
  265. 			return location;
  266. 		}
  267.  
  268. 		public Point getSpeed() {
  269. 			return speed;
  270. 		}
  271.  
  272. 		public void setSpeed(Point speed) {
  273. 			this.speed = speed;
  274. 		}
  275.  
  276. 		protected void paint(Graphics2D g2d) {
  277.  
  278. 			Point p = getLocation();
  279. 			if (p != null) {
  280. 				g2d.setColor(getColor());
  281. 				Dimension size = getSize();
  282. 				g2d.fillOval(p.x, p.y, size.width, size.height);
  283. 			}
  284.  
  285. 		}
  286. 	}
  287. }
Success #stdin #stdout #stderr 0.14s 382208KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
Exception in thread "AWT-EventQueue-0" java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
	at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)
	at java.awt.Window.<init>(Window.java:535)
	at java.awt.Frame.<init>(Frame.java:420)
	at javax.swing.JFrame.<init>(JFrame.java:224)
	at SimpleBalls$1.run(Main.java:35)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
https://ideone.com/vTGzb7
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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