With the Gravity the Actor should move just on an objekt under him.
How to make that?
TopInPut wrote ...
2011/11/18
How to make a Gravity for the actor??
With the method from Greenfoot's library called getOneObjectAtOffset();
Michael Kölling has some video tutorials showing how to do so.
But the idea is simple, create one class for the Actor and another class for the Ground (which I'll call Ground)
you can create a boolean method named onGround() to test if the actor you wanna use is on Ground (true) or not (false). It will look like this:
If he is not on ground, you would want he to fall, so create another method for him to fall. vSpeed is the speed that he falls, and it's increase by the value of acceleration, which can be 1 or 2
Now to finish you just need a method to check if he's falling
I really recommend you to watch Michael Kölling's tutorial so you can know how to this better
public boolean onGround()
{
Object under = getOneObjectAtOffset(0, getImage().getHeight()/2 + 2, Ground.class);
return under != null;
}public void fall()
{
setLocation (getX(), getY() + vSpeed);
vSpeed += acceleration;
}
public void checkFall()
{
if (onGround()) {
vSpeed = 0;
}
else {
fall();
}
}
The video that giordanno92 mentions is here:
http://www.youtube.com/user/18km?ob=5#p/u/10/VAHDrJ069sI
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