I need help with 'mapping' time on a line. Related to time and flights/arrival and destination time. 

For example, let's say time right now is: 15:30:00
The arrival time and the departure time are 14:00:00 and 17:30:00 respectively. As till now, for the time i have divided/splitted into H, M, and S like this-

(function inside class)-

2. void getDepartureTime() {
3.      println(DepartureTime);
4.    int p = DepartureTime.length();
5. 
   
6.   
7.    String[] H   = new String[p];
8.    String[] M = new String[p];
9.    String[] S = new String[p];
10.   
11.    int[] hours = new int[p];
12.    int[] minutes = new int[p];
13.    int[] seconds = new int[p];
14.    
15.    for(int k=0; k < p; k++) {  
16.    String[] divide = split(DepartureTime, ":");
17.     
18.     H[k]   = divide[0];
19.     M[k]   = divide[1];
20.     S[k]   = divide[2];
21.   
22.    }
23.   for(int k = 1; k < p; k++) {
24.     hours[k]   = Integer.parseInt(H[k]);
25.     minutes[k] = Integer.parseInt(M[k]);
26.     seconds[k] = Integer.parseInt(S[k]);
27.     
28.    stroke(palette[4]);
29.  //  map(hours[j], 0, 50, width/2, height);
30.  //  line(width/2, height/2, hours[j]*40, minutes[j]*50);
31.   }

 

So, if i could draw a point on a line which signifies or maps the current time with respect to Arrival and destination time. I mean the point should be somewhere around 50% of the length of the line(as per the example which we took). It's the format (HH:MM:SS), which is confusing.