1    /* 
2     * bounce.java 
3     * 
4     * Created on December 12, 2002, 6:57 PM 
5     * @author  greg stewart 
6     * reproduction prohibited without authorisation 
7     */ 
8     
9    package bookExamples.ch08ArraysAndVectors.array; 
10    
11   import javax.swing.*; 
12    
13   class IO { 
14       public static float getVal(Object o) { 
15           return Float.parseFloat(JOptionPane.showInputDialog(o)); 
16       } /*end getVal()*/ 
17    
18       public static void sysout(Object o) { 
19           System.out.print(o); 
20       } /*end sysout()*/ 
21   } /*end IO{}*/ 
22    
23   public class Bounce { 
24       int S1, pos = 0; 
25       float S2, L, V, C; 
26       float T[] = new float[20]; 
27    
28       /** Creates a new instance of Bounce */ 
29       public Bounce(float _V, float _S2, float _C) { 
30           IO.sysout("\nV = " + (V = _V)); 
31           IO.sysout("\nS2 = " + (S2 = _S2)); 
32           IO.sysout("\nC = " + (C = _C)); 
33           IO.sysout("\nS1=" + (S1 = (int) (70 / (V / (16 * S2)))) + "\n"); 
34       } /*end constructor()*/ 
35    
36       /* OVER-modularised & time-consuming code: */ 
37       public void fillTime() { 
38           for (int i = 1; i <= S1; i++) { 
39               T[i] = (float) (V * Math.pow(C, (i - 1)) / 16); 
40           } /*end for(i)*/ 
41       } /*end fillTime()*/ 
42    
43       /* More OVER-modularised & time-consuming code: */ 
44       public float getHeight() { 
45           return (int) (-16 * ((V / 32) * (V / 32)) + (V * V) / 32 + 0.5); 
46       } /*end getHeight()*/ 
47    
48       /* Still More OVER-modularised & time-consuming code: */ 
49       public float getXCoor(int i, float j, float H) { 
50           return (float) Math.abs((H - (0.5 * (-32) * (j * j) + V * Math.pow(C, (i - 1)) * j))); 
51       } /*end getXCoor()*/ 
52    
53       public void plotHeight() { 
54           float t, height = getHeight(); 
55           for (float H = height; H >= 0; H -= 0.5) { 
56               if (H == (int) H) { 
57                   IO.sysout("" + (int) H); 
58               } /*end if(H)*/ 
59               L = 0; 
60               for (int i = 1; i <= S1; i++) { 
61                   plotVal(i, H); 
62                   t = T[i + 1] / 2; 
63                   if (((-16) * (t * t) + V * Math.pow(C, (i - 1)) * t) < H) { 
64                       pos = 0; 
65                       IO.sysout("\n"); 
66                       break; 
67                   } /*end if([math])*/ 
68               } /*end for(i)*/ 
69           } /*end for(h)*/ 
70       } /*end plotHeight()*/ 
71    
72       public void plotVal(int i, float H) { 
73           for (float j = 0; j <= T[i]; j += S2) { 
74               L += S2; 
75               float temp = getXCoor(i, j, H); 
76               if (temp <= .25) { 
77   //      debug("[" + (int)(L/S2) + ":" + pos + "]"); 
78                   IO.sysout(padString((int) (L / S2)) + "0"); 
79               } /*end if(temp)*/ 
80           } /*end for(j)*/ 
81       } /*end plotVal()*/ 
82    
83       public void printAxis() { 
84           IO.sysout("\n"); 
85           for (int i = 1; i <= (int) (L + 1) / S1 + 1; i++) { 
86               IO.sysout(". "); 
87           } /*end for(i)*/ 
88       } /*end printAxis()*/ 
89    
90       public void labelAxis() { 
91           pos = 0; 
92           IO.sysout("\n0"); 
93           for (int i = 1; i <= (int) (L + .9995); i++) { 
94   //      debug("[" + (int)(i/S2) + ":" + pos + "]"); 
95               IO.sysout(padString((int) (i / S2)) + i); 
96           } /*end for(i)*/ 
97           IO.sysout("\n" + padString((int) ((L + 1) / (2 * S2) - 2) + pos) + "Seconds"); 
98       } /*end labelAxis()*/ 
99    
100      public String padString(int l) { 
101          String s = ""; 
102          for (int i = 0; i <= (l - pos); i++) { 
103              s += " "; 
104          } 
105          pos += s.length(); 
106          return s; 
107      } 
108   
109      public void run() { 
110          IO.sysout("\n"); 
111          this.fillTime(); 
112          this.plotHeight(); 
113          this.printAxis(); 
114          this.labelAxis(); 
115      } /*end run()*/ 
116   
117      /* remove all debug() when satisfied. */ 
118      public void debug(Object o) { 
119          IO.sysout(o); 
120      } /*end debug()*/ 
121   
122      /** 
123       * @param args the command line arguments 
124       */ 
125      public static void main(String[] args) { 
126          Bounce b = new Bounce(IO.getVal("Velocity (FPS): "), 
127                  IO.getVal("Time Increment (Sec): "), 
128                  IO.getVal("Coefficient: ")); 
129          b.run(); 
130      } /*end main()*/ 
131   
132  } /*end class Bounce{}*/