Discussions

The last phrase says it all. Use it with an int timer or a boolean that tracks the state of the key. A timer will allow continuous regulated shooting while the key is held down. A boolean that tracks the state of the field can be used to only shoot when the key changes state (from up to down or from down to up).

If you use the normal world constructor ( 'WorldClassName(int, int, int)' ) and not the other one ( 'WorldClassName(int, int, int, boolean)" ), then your actor will never have a negative x-coordinate value. If you try to place or move your actor passed the left edge, it will be place at the left edge. In other words, its x-coordinate value will be zero and never go below it.

Thanks

I just ended up making it so both SpaceWorlds call getLevel and theres a static boolean called warned so it only warns about the random level once.

You only need to understand the concept of the 'this' keyword. It refers to the object that is currently being worked on. It is always an object that is created from the class the word is used. So, you can have an actor remove itself from the world it is in with: <Code Omitted>I added the second line example to show that when a method is called and no object is explicitly given for the method to execute for or on (which is like the first line), then that method is, by default, called on the object the executing metho

Thank you! I added the code and realized it was off of the screen.

Maintain a zero rotation by saving the direction of movement in a field: <Code Omitted>

OK. I'll try that out. Thanks!

You are probably using static fields where you shouldn't -- or you are not initializing their values in your initial world where you should.

just to make sure everything is correct heres my world

The first two parameters of the 'drawRect' method are the location coordinates that the rectangle is to start from on the image it will be drawn on. It is the location where the top-left corner of the rectangle will be. If you place the top-left corner of a rectangle below and to the right of the image, none of the rectangle will be drawn on the image itself. Btw, a new GreenfootImage will have a default drawing color of black; so the last line is not needed: <Code Omitted>This line starts the rectangle at the top-left corner of the created image and gives the

Yes -- knowing the code is in your Savior class help a bunch. You are trying to use the 'getX' and 'getY' methods on the class itself. The class is the script that you write -- not the actor(s) that are created from the class. The class has no location in your world -- the objects create

You probably used the 'clear' method on the background image. The background should remain opaque. If you do 'clear' it, make sure you 'fill' it again with a non-transparent image or color.

I cannot say why the image is blurred in such a way. I, for one thing, prefer not to use the 'drawString' method as the image is already set in size and if the new string drawn on it is larger, it is possible to lose the last part of the drawn string off the edge of the image. I prefer to create a text image (using the GreenfootImage constructor that requires the text to be drawn) and then use the 'drawImage' method if needed (the size of the two images ca

Again, you need to post the error trace. Do what I mentioned in my last post.