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Sorry guys, I found I didn't use the if statement correctly, instead of if (Ground = true) it is if (Ground == true)

good job.

To be sure, check the documentation. For code in an Actor subclass, refer to the Actor class documentation, where you will find the 'getWorld' method that returns a World object; then, check the World class documentation, where you will find the 'addObject' method. You will always be able to follow this pattern for any 'dot' operated statement (each part returns an object reference or a value; and for any object reference, you can refer to the documenta

Thanks! sorry for being a total noob, I am trying to make a physics engine

it looks like it is trying to call out to both the greenfoot.org site as well as yours - we are getting a security Exception of some sort. if you want to go a sub frame route that would be doable - you could possibly also use a dynamic script tag - or maybe the classes can be extracted and added to a dummy project - basically make a fake project with same class names and then patch in the classes you want over the dummy ones.

Constantly check for obstacles (walls) and keep off them. Refer to the Actor class documentation and see what methods are available for accomplishing this task.

'showText' is a method of world, not actor. (Just in case this is used in an Actor subclass, I can't see this in your code snippet.) In front of the word "Bullets" you need another double quote. <Code Omitted>

Apparently, it is used to step, pixel by pixel (or, rather, cell by cell), through the entire move distance. The horizontal and vertical movements are also done individually. By doing so, the object actor will stop moving in either direction upon intersecting a Wall object and no backing off is required (although, backing up once could still be added when a Wall object is contacted to prevent any intersection with the Wall object).

YOU CAN ALSO USE SOMETHING LIKE THIS FOR COLLISION AND WHEN YOU WHAT TO MOVE THE CHARACTER TO DIFFERNET DIRECTION WITHTOUT PASSING THROUGHT CHARACTERS SUCH AT THE WALL.

Never mind. Managed to get it fixed, and now I should be able to use this to create a directional system. Thanks! -TheGoldenBucket

My apologies. The i Actor is an intersection and I have managed to figure out what I did wrong. The RIGHT, LEFT, UP and DOWN are rotation values, RIGHT = 0, LEFT = 180, UP = 270, DOWN =90. It helps me to keep things in perspective. Anyway, thanks for replying even when I didn't make things clear.

To remove the error, change line 13 to this: <Code Omitted>which ensures the actor is still in the world before checking world edges. To also remove the asteroid collided with, insert the following at line 8: <Code Omitted>

The main thing that is wrong is that you cannot pass more than one actor to the 'removeObject' method (see line 2). The only thing you want to do if either condition in line 1 is true is remove the shot. This means that if colliding with an asteroid, the asteroid should be removed within the method that checks for its intersection::

Oh its fixed. Just one of the spawns, thank you so much for your help.