Discussions

oh... i think i got it. it returns a List no matter what, but the list is empty if nothing is intersecting it. is there a way to turn an empty list into 'null' or 'false'? there is.... List.isEmpty() will return true if the list is empty.... ok, got it ;)

Set it to 'true' immediately before the two lines provided for the countdown above. Set it to 'false' immediately after the two lines provided for the countdown above.

You should be able to set up a new int variable 'private int ladderSpeed = 3;' in the class, but outside any method within the class, and use it instead of speed.

I guess I had the right reasoning behind the 'motionXdenom' usage, but I should have looked more closely at the 'motionXaccum' variable (something had to save the fractional part to facilitate the smoothness of motion). Thanks for the clarification, davmac.

The setImage() command takes an image as the parameter. A filename ("myImage.jpg") is a String object; use it with a GreenfootImage constructor to create the image; then use that new image in the setImage() command.

You have to choose a location to save it where you have write access - your Documents folder is usually a good bet - and then give the scenario a name (which can be the same name, as long as you haven't saved it there already!). Don't try to save it over another scenario.

All the videos (Joy of Code and beforehand) are part of the same youtube collection. Follow the link from the documentation page.

Sorry for the multiple partial postings (I accidentally tried to use the tab key in the posting and that selects the 'Post' button, where I must have hit 'Enter' a couple of times). I forgot to mention that the code above should be in an act() method or in a method that an act() method calls.

<Code Omitted>Also, this might work:

Technically speaking an image comprises part of the state of an actor, so the answer would be yes! You can use the getImage() method to grab the current image on the actor, and then take an action based on what image it is. However, using the current image of the actor to determine what state it's in isn't necessarily the best idea because it couples each image to a certain state, without the possibility of changing it later (without refactoring the code.) You may be better to store the "state" that you want separately, such as in an integer - and then use an if statement over that integer

I just woke up... glad to hear it's sorted.

ok, finally the scenario works.. thanks for the help davmac!

Do you mean as in a Space Invaders type of game? I'm not aware of any "official" Greenfoot version but there are a few on the gallery - type "invaders" into the search box (top of this page) and you'll see them.