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练习.小球撞墙反弹
1 package com.java7.myball.main; 2 import java.awt.*; 3 4 public class MyBall { 5 public static void main(String[] args) { 6 Frame w = new Frame(); 7 w.setSize(300, 400); 8 9 MyPanel mp = new MyPanel(); 10 w.add(mp); 11 12 Thread t = new Thread(mp); 13 t.start(); 14 15 w.show(); 16 } 17 } 18 19 class MyPanel extends Panel implements Runnable { 20 int x1 = 30; 21 int y1 = 30; 22 int x2 = 280; 23 int y2 = 358; 24 int cr = 0; 25 int cg = 0; 26 int cb = 0; 27 int att1 = 0; // 0=右下；1=左下；2=左上；3=右上 28 int att2 = 0; 29 boolean b = true; 30 public void paint(Graphics g) { 31 g.setColor(new Color(cr, cg, cb)); 32 g.fillOval(x1, y1, 20, 20); 33 g.fillOval(x2, y2, 20, 20); 34 } 35 public void run() { 36 while(b) { 37 // 定义飞行姿态 38 if(att1 == 0) { 39 x1++; 40 y1++; 41 } 42 if(att1 == 1) { 43 x1--; 44 y1++; 45 } 46 if(att1 == 2) { 47 x1--; 48 y1--; 49 } 50 if(att1 == 3) { 51 x1++; 52 y1--; 53 } 54 if(att2 == 0) { 55 x2++; 56 y2++; 57 } 58 if(att2 == 1) { 59 x2--; 60 y2++; 61 } 62 if(att2 == 2) { 63 x2--; 64 y2--; 65 } 66 if(att2 == 3) { 67 x2++; 68 y2--; 69 } 70 71 // 改变飞行姿态 72 if(x1 > 280) { 73 if(att1 == 0) { 74 att1 = 1; 75 cr = (int)(Math.random() * 255); 76 cg = (int)(Math.random() * 255); 77 cb = (int)(Math.random() * 255); 78 } else { 79 att1 = 2; 80 cr = (int)(Math.random() * 255); 81 cg = (int)(Math.random() * 255); 82 cb = (int)(Math.random() * 255); 83 } 84 } 85 if(y1 > 358) { 86 if(att1 == 1) { 87 att1 = 2; 88 cr = (int)(Math.random() * 255); 89 cg = (int)(Math.random() * 255); 90 cb = (int)(Math.random() * 255); 91 } else { 92 att1 = 3; 93 cr = (int)(Math.random() * 255); 94 cg = (int)(Math.random() * 255); 95 cb = (int)(Math.random() * 255); 96 } 97 } 98 if(x1 < 0) { 99 if(att1 == 2) {100 att1 = 3;101 cr = (int)(Math.random() * 255);102 cg = (int)(Math.random() * 255);103 cb = (int)(Math.random() * 255);104 } else {105 att1 = 0;106 cr = (int)(Math.random() * 255);107 cg = (int)(Math.random() * 255);108 cb = (int)(Math.random() * 255);109 }110 }111 if(y1 < 0) {112 if(att1 == 3) {113 att1 = 0;114 cr = (int)(Math.random() * 255);115 cg = (int)(Math.random() * 255);116 cb = (int)(Math.random() * 255);117 } else {118 att1 = 1;119 cr = (int)(Math.random() * 255);120 cg = (int)(Math.random() * 255);121 cb = (int)(Math.random() * 255);122 }123 } 124 if(x2 > 280) {125 if(att2 == 0) {126 att2 = 1;127 cr = (int)(Math.random() * 255);128 cg = (int)(Math.random() * 255);129 cb = (int)(Math.random() * 255);130 } else {131 att2 = 2;132 cr = (int)(Math.random() * 255);133 cg = (int)(Math.random() * 255);134 cb = (int)(Math.random() * 255);135 }136 }137 if(y2 > 358) {138 if(att2 == 1) {139 att2 = 2;140 cr = (int)(Math.random() * 255);141 cg = (int)(Math.random() * 255);142 cb = (int)(Math.random() * 255);143 } else {144 att2 = 3;145 cr = (int)(Math.random() * 255);146 cg = (int)(Math.random() * 255);147 cb = (int)(Math.random() * 255);148 }149 }150 if(x2 < 0) {151 if(att2 == 2) {152 att2 = 3;153 cr = (int)(Math.random() * 255);154 cg = (int)(Math.random() * 255);155 cb = (int)(Math.random() * 255);156 } else {157 att2 = 0;158 cr = (int)(Math.random() * 255);159 cg = (int)(Math.random() * 255);160 cb = (int)(Math.random() * 255);161 }162 }163 if(y2 < 0) {164 if(att2 == 3) {165 att2 = 0;166 cr = (int)(Math.random() * 255);167 cg = (int)(Math.random() * 255);168 cb = (int)(Math.random() * 255);169 } else {170 att2 = 1;171 cr = (int)(Math.random() * 255);172 cg = (int)(Math.random() * 255);173 cb = (int)(Math.random() * 255);174 }175 }176 // 设置两球相撞后反弹，未完成177 // if(x1 <= x2 - 30 && y1 <= y2 - 30) {178 // if(att1 == 0) {179 // att1 = 1;180 // cr = (int)(Math.random() * 255);181 // cg = (int)(Math.random() * 255);182 // cb = (int)(Math.random() * 255);183 // } else {184 // att1 = 2;185 // cr = (int)(Math.random() * 255);186 // cg = (int)(Math.random() * 255);187 // cb = (int)(Math.random() * 255);188 // }189 // }190 // if(x2 >= x1 + 30 && y2 >= y1 + 30 ) {191 // if(att1 == 0) {192 // att1 = 1;193 // cr = (int)(Math.random() * 255);194 // cg = (int)(Math.random() * 255);195 // cb = (int)(Math.random() * 255);196 // } else {197 // att1 = 2;198 // cr = (int)(Math.random() * 255);199 // cg = (int)(Math.random() * 255);200 // cb = (int)(Math.random() * 255);201 // }202 // }203 try {204 Thread.sleep(20);205 } catch(Exception e) {206 207 }208 repaint();209 }210 }211 }
练习.小球撞墙反弹
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