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Java clear part canvas

Posted on 2010-09-15
5
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Last Modified: 2013-11-23
Hi all

I'm new to Java and learning

If I was to clear the canvas I would use removeAll()

how can I remove objects only from the bottom half of my canvas and specify the x y of what part I want to clear

Thanks
0
Comment
Question by:markavo
  • 3
5 Comments
 
LVL 26

Expert Comment

by:ksivananth
ID: 33689034
you need to provide the impl,

1. travese all the components in the canvas
2. compare the co-ordiante of the components in the canvas against your x, y
3. if it is after that, remove that component
0
 
LVL 37

Expert Comment

by:zzynx
ID: 33689208
>> specify the x y of what part I want to clear
Why would you want to do that?

When I read this, I think you're working a bit unusual.
That's why I ask you the previous question.

If I know what components I need to remove at some point in time, I would keep references to them.
Then to remove them I can simply call

remove( getMyComponent1() );
remove( getMyComponent2() );
...
remove( getMyComponentN() );
0
 

Author Comment

by:markavo
ID: 33695631
Hi

Thank you , can you give me an example please how i would reference for example

GRect rect = new GRect (x,y, height, width) ;
add(rect);

so rect holds a new Grect

this would remove the object ---- remove(rect);

How would i pass the reference through to methods so i can remove objects from within a method and call remove(rect)

help appreciated
0
 
LVL 37

Accepted Solution

by:
zzynx earned 250 total points
ID: 33699111
>> How would i pass the reference through to methods so i can remove objects from within a method and call remove(rect)

GRect rect = new GRect (x,y, height, width) ;
add(rect);

....

yourMethod1(rect);
...
yourMethod2(rect);

with

private yourMethod1(GRect rect) {
   ....
   remove(rect);
   ....
}

and

private yourMethod2(GRect rect) {
   ....
   remove(rect);
   ....
}
0
 
LVL 37

Expert Comment

by:zzynx
ID: 33723881
Thanx 4 axxepting
0

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