关于小球运动路径问题
Java codepackage view;import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.Image;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;import java.util.List;public class MainView extends Frame{ private static final long serialVersionUID = 4090565292134499038L; public static final int ROWS = 3; public static final int COLS = 3; public static final int BLOCK_SIZE = 100; public static int N = 100; public static int M = 50; public String str1 = "111221......"; //此处，我准备储存把小球的路径的坐标写成字符串的形式赋给str public String str2 = "111221......"; Ball ball = null; Image offScreenImage = null; List<Point> points = null; MainView(List<Point> points){ this.points = points; } public void launch(){ ball = new Ball(this.points.get(0)); this.setLocation(100,100); this.setSize(800,600); this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); this.setVisible(true); new Thread(new WatcherThread(ball,points,this)).start(); } public static void main(String[] args) { List<Point> points = new ArrayList<Point>(); points.add(new Point(150,150));//此处的Point 值我想通过读取str中的数据来赋值 points.add(new Point(150,250));//另外就是str中的坐标长度可能不一样，所需的point也就不一样，看看怎么改 points.add(new Point(250,250)); points.add(new Point(250,350)); points.add(new Point(150,350)); points.add(new Point(150,450)); new MainView(points).launch(); } public void paint(Graphics g) { super.paint(g); g.drawLine(1*N+M,1*N+M,1*N+M,4*N+M); g.drawLine(2*N+M,1*N+M,2*N+M,4*N+M); g.drawLine(3*N+M,1*N+M,3*N+M,4*N+M); g.drawLine(4*N+M,1*N+M,4*N+M,4*N+M); g.drawLine(1*N+M,1*N+M,4*N+M,1*N+M); g.drawLine(1*N+M,2*N+M,4*N+M,2*N+M); g.drawLine(1*N+M,3*N+M,4*N+M,3*N+M); g.drawLine(1*N+M,4*N+M,4*N+M,4*N+M); ball.draw(g); } @Override public void update(Graphics g) {// 双缓冲 if (offScreenImage == null) { offScreenImage = this.createImage(500,500); } Graphics gOff = offScreenImage.getGraphics(); paint(gOff); g.drawImage(offScreenImage, 0, 0, null); } private class WatcherThread implements Runnable { boolean flag = true; private Ball ball; private List<Point> points; private MainView main; WatcherThread(Ball ball,List<Point> points,MainView main) { this.ball = ball; this.points = points; this.main = main; this.flag = true; } public void run(){ while (flag) { if (points.size()>=1){ if (ball.x == points.get(0).x && ball.y == points.get(0).y && points.size()==1){ flag = false; }else{ if (ball.x == points.get(0).x&& ball.y == points.get(0).y){// 拿Point.get(0)那个Point.get(1)出来比较，就可以确定方向。 Direction dir = getDir(points.get(0), points.get(1)); ball.dir = dir; points.remove(0); } } }else { flag = false; } try { Thread.sleep(100); ball.move(); main.repaint(); } catch (InterruptedException e) { e.printStackTrace(); } } } private Direction getDir(Point point, Point point1) {// 线程监听临界状况，在判断方向。 if (point1.x > point.x){ return Direction.RIGHT; } else if (point1.y > point.y) { return Direction.DOWN; } else if (point1.y < point.y) { return Direction.UP; } else if (point1.x < point.x){ return Direction.LEFT; } return Direction.RIGHT; } }}enum Direction {//支持上下左右，你可以扩展的。 UP, LEFT, RIGHT, DOWN;}class Point{ public Point(int x, int y) { this.x = x; this.y = y; } int x; int y;}class Ball { static final int SPEED = 5; Direction dir; int x; int y; Ball(){ x = 0; y = 0; dir = Direction.RIGHT; } public Ball(Point point) { this.x = point.x; this.y = point.y; } public int getX() { return x; } void draw(Graphics g){ Color c = g.getColor(); g.setColor(Color.red); g.fillOval(x-5, y-5, 10, 10); g.setColor(c); } void move(){ switch(this.dir){ case UP: this.y = y - SPEED; break; case DOWN: this.y = y + SPEED; break; case LEFT: this.x = x - SPEED; break; case RIGHT: this.x = x + SPEED; break; } }}