Game Development Reference
In-Depth Information
Now that the score values are increasing as enemies are defeated, we can use those values
to increase the power of the spear. Each score value/color will have a different effect on the
spear. These effects are as follows:
F
The
scoreRed
value will influence how quickly the player can shoot another spear
F
The
scoreBlue
value will determine when the spear will be upgraded to a
new costume
F
The
scoreYellow
value will increase the number of spears shot simultaneously
Let's start scriping the scoring system into the spear sprite. We will tackle the
scoreRed
funcionality irst. As the
scoreRed
value increases, spears will be spawned at a faster rate.
We put a limit of
30
on the value to prevent the spawn rate from increasing to absurd levels.
1. We start this piece of script with an
if () then () else ()
condiion block.
2. We use this block to check whether
scoreRed
is less than 30 by entering
30
in
the
scoreRed < () block
. We now allow the script to calculate the spawn rate.
3.
If this is true, we calculate the spawn rate based on the
scoreRed
value as follows:
1. First, divide the
scoreRed
value by
30
.
2. Then, deduct the result from a base value of
1.5
.
3. We wrap this calculation in a
wait () secs
block to cause the delay
between spawns.
The order of the preceding calculaion operators is very important. The operator blocks
will be processed from the innermost block to the outer blocks. The result is the number
of seconds we have to wait for a new spear to appear.
1.
Take the
wait () secs
block and place it inside the
else
bracket to create a minimum
spawn ime of
0.5
seconds when the
scoreRed
value exceeds 30.
2.
Place this piece of script where the
wait 0.5 secs
block was, right underneath the
create clone of <myself>
block.
