复杂性理论 - 编程入门网
作者 佚名技术
来源 NET编程
浏览
发布时间 2012-06-25
| ueColors); // Now start the beasts a-rovin'': thisThread = new Thread(this); thisThread.start(); } public void run() { while(true) { for(int i = 0; i < beasts.size(); i++){ Beast b = (Beast) beasts.elementAt(i); b.step(); } try { thisThread.sleep(delay); } catch(InterruptedException ex){} repaint(); // Otherwise it won''t update } } Vector makeBeastVector( int quantity, boolean uniqueColors) { Vector newBeasts = new Vector(); Random generator = new Random(); // Used only if uniqueColors is on: double cubeRootOfBeastNumber = Math.pow((double)numBeasts, 1.0 / 3.0); float colorCubeStepSize = (float) (1.0 / cubeRootOfBeastNumber); float r = 0.0f; float g = 0.0f; float b = 0.0f; for(int i = 0; i < quantity; i++) { int x = (int) (generator.nextFloat() * xExtent); if(x > xExtent - Beast.GSIZE) x -= Beast.GSIZE; int y = (int) (generator.nextFloat() * yExtent); if(y > yExtent - Beast.GSIZE) y -= Beast.GSIZE; float direction = (float)( generator.nextFloat() * 2 * Math.PI); int speed = (int)( generator.nextFloat() * (float)maxSpeed); if(uniqueColors) { r += colorCubeStepSize; if(r > 1.0) { r -= 1.0f; g += colorCubeStepSize; if( g > 1.0) { g -= 1.0f; b += colorCubeStepSize; if(b > 1.0) b -= 1.0f; } } } newBeasts.addElement( new Beast(this, x, y, direction, speed, new Color(r,g,b))); } return newBeasts; } public Vector beastListInSector(Beast viewer) { Vector output = new Vector(); Enumeration e = beasts.elements(); Beast aBeast = (Beast)beasts.elementAt(0); int counter = 0; while(e.hasMoreElements()) { aBeast = (Beast) e.nextElement(); if(aBeast != viewer) { Point p = aBeast.position(); Point v = viewer.position(); float bearing = aBeast.bearingFromPointAlongAxis( v.x, v.y, viewer.currentDirection); if(Math.abs(bearing) < fieldOfView / 2) output.addElement(aBeast); } } return output; } public void paint(Graphics g) { Enumeration e = beasts.elements(); while(e.hasMoreElements()) { ((Beast)e.nextElement()).draw(g); } } public static void main(String[] args) { FieldOBeasts field = new FieldOBeasts(); field.xExtent = 640; field.yExtent = 480; Frame frame = new Frame("Field ''O Beasts"); // Optionally use a command-line argument // for the sleep time: if(args.length >= 1) field.delay = Integer.parseInt(args[0]); frame.addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.a |
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