Game Development Reference
In-Depth Information
If you change the Platform's
Friction
value and set it much higher, our actor won't
move very well, which would be good for super sticky platforms. We are now
going to work on jumping. You want him to jump only when he is colliding with
the ground, otherwise the player could keep pressing the jump button and he
would just continue to fly; which would be cool, but it wouldn't make the levels
very challenging now, would it? Let's go back to editing our Kevin actor. We need
to create a new attribute within the actor itself, so in the
Attributes
window, click
on the
+
button, select
Boolean
, and name it
OnGround
, and leave it unchecked.
Create a new rule, and change it to
Actor receives event
|
overlaps of collides
|
with actor with tag:
|
Platforms
. Then drag in another rule, change it to
Attribute
|
self.Motion Linear Velocity.Y
|
< 1
, then click on the
+
button within the
rule to create another condition, and change it to
Attribute
|
self.Motion Linear
Velocity.Y > -1
.
Whoa there cowboy! What does this mean? Let's break it down. This is detecting the
actor's up and down motion, so when he is going slower than 1, and faster than -1,
we will change the attribute.
Why do this? It's a bit of a fail safe, so when the actor jumps and the player keeps
holding the jump key, he doesn't keep jumping. If we didn't add these conditions,
the player could jump at times when he shouldn't. Within that rule, drag in a Change
Attribute behavior, and change it to
Change Attribute:
|
self.OnGround
To 1
. (1
being true, 0 being false, or you can type in true or false.)
