Game Development Reference
In-Depth Information
Engage thrusters
This script structure follows the same patern as the irst one. We start with receiving a
patern message. In the end, we let the script take another random patern.
The interesing part takes place in the middle:
1.
First, we use
set rotaion style <let-right>
so that the sprite stays upright while
moving. It looks beter with this patern.
2.
Then we create another variable named
switch
(by choosing
variable only for this
sprite
). We are going to use this as a random selector for the corner that the boss
sprite will iniially move to.
3.
Enter
1
and
4
in the
set <switch> to pick random () to ()
block respecively.
4.
Then we create four
if ()
statements called "cases" in this type of construcion.
Each case holds a diferent instrucion and only one case can be valid each ime:
The first case is
if switch = () then glide () secs to x: () y: ()
. The values for
the top-left of the stage are
-200
and
150
respectively.
The second case is
if switch = () then glide () secs to x: () y: ()
. The values
for the top-right of the stage are
200
and
150
respectively.
The third case is
if switch = () then glide () secs to x: () y: ()
. The values for
the bottom-right of the stage are
200
and
-150
respectively.
The fourth case is
if switch = () then glide () secs to x: () y: ()
. The values
for the bottom-left of the stage are
-200
and
-150
respectively.
Once a corner is chosen, we make the sprite point in direction
-100
to
angle it just off the horizontal line.
5. Then we start a fixed
repeat
loop that will run
500
imes.
6. In each cycle, we move using the
move () steps
block. Due to the angle, we just set
the sprite to move horizontally a lot and verically a bit.
7. We also check when it reaches the side of the stage and prevent it from geing
stuck with an
if on edge, bounce
block.
