If I wanted to click on an object to change worlds, where would I have to put the code? Would it be in the world class or actor class?
Gingervitis wrote ...
2013/3/2
Clicking on an object
I would put the code into an actor class.
The code for this should look like this:
1 2 3 4 5 6 | //in the object you want to click to change the world;public void act() { if (Greenfoot.mouseClicked(this)) { Greenfoot.setWorld(new NextWorld()); }} |
Thank you. I have one more question related to the mouse. Is there a way to make it so when the mouse cursor gets to that object before it is clicked, it will be transparent? I know there is a setTransparency method but how could I implement that to do what I want to do?
If you just want your actor to become transparent it's simple.
Use this method:
then you have to check whether the mouse is on this image like this:
You need the method in the class with this code then it should work.
1 2 3 4 5 | private boolean mouseOnObject(Actor actor) { MouseInfo mouse = Greenfoot.getMouseInfo(); return mouse != null && mouse.getX() > actor.getX() - actor.getImage().getWidth()/2 && mouse.getX() < actor.getX() + actor.getImage().getWidth()/2 && mouse.getY() > actor.getY() - actor.getImage().getHeight()/2 && mouse.getY() < actor.getY() + actor.getImage().getHeight()/2;} |
1 2 3 4 5 6 7 8 9 | //in the class that should be transparent;public void act() { if (mouseOnObject(this)) { setTransparenzy(0); } else { setTransparenzy(255); }} |
Or, more simply:
1 2 | if (Greenfoot.mouseMoved(this)) setTransparency(0);if (Greenfoot.mouseMoved(null) && !Greenfoot.mouseMoved(this)) setTransparency(255); |
I didn't know there was a '.mouseMoved()'. Where was that?
But this method only works if the mouse is moved on the object and not if it just is standing still on it or not?
Gevater_Tod4711 wrote...
But this method only works if the mouse is moved on the object and not if it just is standing still on it or not?It said that setTransparency() is not a method. Does it have to be defined somewhere else?
Gingervitis wrote...
It said that setTransparency() is not a method. Does it have to be defined somewhere else?1 2 | if (Greenfoot.mouseMoved(this)) getImage().setTransparency(0);if (Greenfoot.mouseMoved(null) && !Greenfoot.mouseMoved(this)) getImage().setTransparency(255); |
Thank you. I had feeling that there would need a 'something.' in front of it. . .
Oh ok that would work.
But the method mouseMoved() just checks whether the mouse is realy moved doesn't it?
I just put in the code in my class exactly as you posted, and the transparency stayed the same. Is it because what I want transparent is text? (I wrote the text in Preview and it was not created from Greenfoot labels)
Yes. The 'mouseMoved' method just checks whether the mouse has been moved or not. But the only time you need to check whether it is over the actor or not is when the mouse has been moved. And, the only time the transparency needs changed is when the mouse is moved onto or off of the actor. So, the first 'if' statement covers all movements where the mouse ends up over the object; and the second one covers all movements where the mouse does not end up over the object.
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