Discussions

Unfortunatly there is no physics engine in greenfoot but this doesn't mean that you have to program everything on your own. There are many physics that someone else has already programmed and you can use them. For example for your catapult you could use this physics:

I have managed to solve the problem! The atan() was not happy about using integers instead of doubles. Then I made a host of other changes. Here is my current code: if (exploded == false && genericDelay < 0){ Actor player = (Actor) getWorld().getObjects(Player.class).get(0); double missileX = (double) this.getX(); double missileY = (double) this.getY(); double playerX = (double) player.getX(); double playerY = (double) player.getY(); double number = (missileX - playerX) / (playerY - missileY); double

I figured it out, getKey() only returns the last key pressed. Changed my whenClicked() method to: <Code Omitted> It w

It works, thank you so much!

i thought it was something else.......... oh well, im glad it worked!

If you still need help im guessing you are using a detection that uses direct x + y coor's which will only be true for the very center of the object

I figured it out. I had two constructors for the same thing and only one was being called for.

The statement 'rotation += 5;' is the same thing as 'rotation = rotation + 5;. Since we are turning the actor plus five degrees, we want our rotation field to adjust by that same amount so we know the new bullet rotation value.

Thank you.... but i all ready came up with a way to do it.... if you want to see it you know where to go... but eventually i will probably use that

Thank you SOOOO much

Another way to handle this is to combine the two methods into one, supplying the class to check for in a parameter field. Have the method return a boolean indicating whether an object was found or not. This is how it would be done:

You do not have to double post (unless your request for help goes days without a response -- then, just post 'bump'). There does not appear to be anything wrong with the Turtle class code as far as the 'canSee' method call. Maybe the Animal class code was altered (possibly by accident). Please show the code you have in the Animal class.

No traffic control system is perfect. Even controlling the interaction between two vehicles involves not just the state of the two being close to each other, but determining how they are approaching each other and turning the correct way to avoid each other takes a bit of Maths. When a third vehicle is introduced into the equation, things really get complicated. Basically, what I am saying is that this is probably not anything a beginner should try to tackle. You could, however, randomly choose a direction and begin turning that way until either a collision occurs or the two vehicle have cl