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The VBA code behind our CommuteTime1 example follows a simple outline:
In line 3 below we declare an array that will capture
only the summarized, cumulative data, which will be copied to the worksheet at
each refresh interval.
Once the three separate driving segments have been calculated for each
iteration, we wrap up the function by adding the drive time for the three
segments together and rounding the result to the nearest minute (line 46);
updating our summary array with the result of the current iteration (line 47);
updating the worksheet with the current status if the current iteration is a
specified update interval (lines 50 - 52); and pausing the program for 1/10
second to allow time for the graph on the worksheet to refresh (lines 54 - 59).
As a final step in line 64, we write the array contents to the worksheet one
more time. This is necessary in case our refresh interval does not divide
evenly into the number of iterations - otherwise line 52 would be sufficient.
Next we'll look at how the output appears on the worksheet.