Need help understanding the C code for the game Paratrooper.

**anothercoder95** · 10-22-2015

Code:

/* x coordinates of paratroopers at the point of jumping from helicopters */ 
int jump_pt[8][4] = {                        53, 235, 405, 587,
                        600, 574, 66, 40,
                        79, 196, 444, 561,
                        548, 522, 118, 92,
                        105, 209, 431, 535,
                        496, 470, 170, 144,
                        131, 222, 418, 509,
                        483, 457, 183, 157
                     } ;

Could someone explain how exactly these coordinates are decided? Are they just random numbers? This code is from the book C Projects by Kanetkar. I'm trying to implement it as part of my project in college. Any help would be appreciated.

**laserlight** · 10-22-2015

Your guess is better than mine: I have never heard of the game called Paratrooper, and even if I had, my name is not Kanetkar.

**Nominal Animal** · 10-22-2015

There are bajillions of Paratrooper clones. I remember playing this one (Youtube video). Per the comment, the values are the x coordinates where the helicopters drop a paratrooper.

Are the values random? Why don't you use your tools to check?

I saved the values to a file, one number per line, adding the line number as the second number on each line, and told my trusty gnuplot to

Code:

gnuplot -pe 'set xrange [0:640]; set yrange [0:33]; unset ytics; plot "file" u 1:2 notitle w lines, "" u 1:2 notitle w points lc -1'

and it drew this plot for me:
Need help understanding the C code for the game Paratrooper.-paratrooper-png

I'm sure you could use LibreOffice Calc, Excel, or any number of other tools to draw it if you don't want to use gnuplot.

Note that the vertical axis is not relevant, I just didn't want the lines to overlap, and stretched it upwards. That's why I used the line number. The first value is at the bottom, the last value at the top. If you want it reversed, use u 1:(-$2) instead of u 1:2 for gnuplot, to negate the vertical axis.

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