How do you add gravity? also how do you code platforms?
The DoctorProfessor is out!
DoctorProfessorYoshi wrote ...
2013/6/26
Gravity
Using gravity is not very difficult. You just have to declare a variable gravity in the worldclass or anywhere you want to use it and add the value of this gravity variable to the actors current y movement:
Then you can add some things like a maximum falling speed or that the y movement is 0 if your actor is standing on a platform.
To create platforms I would advice you to use Gravity Engine by Busch2207.
Using this demo you can create platforms your actor can stand on.
private double velY;//the actors y movement;
public void act() {
velY += ((YourWorld) getWorld().GRAVITY;//to use the gravity like this you should declare it public static final;
//... some other stuff;
setLocation(getX() + velX, getY() + velY);
}
http://www.greenfoot.org/scenarios/7586
Tried putting your code into the world class, and it didn't work. Tried it in the actor class, and it said that
cannot find symbol - variable GRAVITY
Do you have any ideas what's going on? Oh and @sametguzelgun, I couldn't understand what your code meant. I only speak English, a small amount of Spanish, even less French, Klingon, Goa'uld, Jabberwocky (Wookie), Ewok and Huttese. please post all code in those languages.
The DoctorProfessor is out!
I use gravity in both my Scrolling SuperWorld and my Toll-Tally Mad scenarios with open code.
If your actor doesn't find the variable GRAVITY you propably declared it private or tried to access it the wrong way.
I think GRAVITY should be a variable in the world (declared public static final). If you want to access this variable from your actor you can't use just the name of the variable but the classname of your world and the variable name:
WorldName.GRAVITY;
If this is not the problem you should post the code that doesn't work here.
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