This was the problem I was having. Where do I put line 52?
bbwf wrote ...
2013/1/17
How to change the background if an actor hits the edge of the world?
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For what purpose did you add that line? what were you trying to accomplish? (be specific)
NVM, its the main topic of the discussion, will post back momentarily.
This is what I'm trying to accomplish. When my actor (bob) hits either the right edge of the left edge of my world (called Background) I want bob to switch worlds into a new Background. My entire goal of this is to make bob walk from his house to the store, so he has to bassicaly switch sides when he hits the edge untill he gets to the store. Didn't see you edited it, here's a more deatiled idea anyways.
Modifification of your 'atWorldEdge' method follows:
Now you will be able to check them individually (left and right; or, top and bottom).
Then in your main code where you use 'if(atWorldEdge())', you can do something like
The formula in the x value is simplified from this (using 'x' for 'getX()'):
((x-20)+((w-20)-20))%((w-20)-20)+20
If the limits of the actor where zero and 'getWidth()-1' (the world edges themselves), then it would look like this:
(x+w)%w
The '%' is the modulus operator, returning the remainder of taking what is on the left and dividing it by what is on the right.
To built up to that logic:
You should be able to see what happens with a simple range, let us say 0 to 10. If your value was -1, adding the upper limit to ensure the value is not negative gives 9, and the remainder of 9/10 is 9. If your value was 11, adding the upper limit this time gives 21, and the remainder of 21/10 is 1. This method basically connects the two ends of your range so that going off one end brings you back in at the other. If the lower limit is not zero, the we must first adjust everything so that it is zero and afterwards, adjust back.
public boolean atWorldEdge()
{
return (atHorizontalEdge() || atVerticalEdge());
}
private boolean atVerticalEdge()
{
return (getX()<20 || getX()>getWorld().getWidth()-20);
}
private boolean atHorizontalEdge()
{
return (getY()<20 || getY()>getWorld().getHeight()-20);
}if(atWorldEdge())
{
if(atSideEdge())
{
getWorld().setBackground("lol.png");
int w=getWorld().getWidth();
setLocation((getX()+w-60)%(w-40)+20, getY());
}
else { }// if you need one
}Thanks, it worked. Now how would I have it change again if hit at world edge on the new world? I'm basically making levels kind of.
Since the code is in the class of the actor in question, it should work no matter what world it is in.
Yes but I want it to change worlds after it hits the second world, so after it goes into a new world I want it to change into a NEW world if it hits the edge of the second world
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