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Index › Programming Questions & Help › Syntax Questions › problem with boolean method
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problem with boolean method (Read 552 times)
constanton
problem with boolean method
May 2nd, 2009, 9:33am  
Hello! I just started to write my own processing application and I just faced a weird problem.

Inside a class I there is this  boolean method :
Code:
boolean mymethod(){
  for ( blah blah ){
     for ( blah blah ){ 
            if (i == mouseX && j == mouseY) {
                   return true ;
             } else {
                  return false ;       
        }
     }
  }
 }


But when I try to run the code I get:
This method must return a result of type boolean.

Any ideas?
Thanks.
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PhiLho 
Re: problem with boolean method
Reply #1 - May 2nd, 2009, 9:48am  
You don't provide full code, the inside test is a bit weird, as you would exit on the first loop...
I suppose that's not the case, so there are cases where you might reach the end of the method without going the "return" way.
In other words, you need to put a "return true;" (or false, depending on the wanted default) at the end of the function.
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constanton
Re: problem with boolean method
Reply #2 - May 2nd, 2009, 10:00am  
PhiLho  wrote on May 2nd, 2009, 9:48am:
In other words, you need to put a "return true;" (or false, depending on the wanted default) at the end of the function.


Yeap! That was it...thanks a lot!!!
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constanton
Re: problem with boolean method
Reply #3 - May 2nd, 2009, 10:22am  
Eh...sorry again, It seems that putting " return false; " at the end of the method always makes the method false.

I need to exit the loops and turn the method true when  " if (i == mouseX && j == mouseY) " is true.

I want to make a multitouch application. I just want to test it first with the mouse. So, when the mouse enters a picture, only then the picture can be moved.

I used this ( h  ttp://processing.org/learning/basics/sprite.html ) as an example and I just want to modify it for my purpose.

Code:
boolean pictouch( ){
  for ( float i = posx ; i<=posx + pic.width; i++){
     for ( float j = posy ; i<=posy + pic.height; i++){ 
                    if (i == mouseX && j == mouseY) {
                      return true ;
            }    
        }
     }
 return false ;  
 }
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NoahBuddy
Re: problem with boolean method
Reply #4 - May 2nd, 2009, 11:12pm  
At first glance I would say it is because you are using i instead of j as your loop conditions:
Code:

    for ( float j = posy ; i<=posy + pic.height; i++){


Aside from that, if you only need to know if the mouse is over an image, you can use
Code:

boolean pictouch() {
  return ( (mouseX >= piclocationx) &&
    (mouseX <= piclocationx+pic.width) &&
    (mouseY >= piclocationy) &&
    (mouseY <= piclocationy+pic.height) );
}
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constanton
Re: problem with boolean method
Reply #5 - May 3rd, 2009, 8:13am  
NoahBuddy wrote on May 2nd, 2009, 11:12pm:
At first glance I would say it is because you are using i instead of j as your loop conditions:
Code:

    for ( float j = posy ; i<=posy + pic.height; i++){


Well, I guess some people have the chance to see the proof that they are blind.  Grin
Thanks a lot...

One final question. I'll use the tuio plugin. So, in order to have a drag I believe I should check whether the first point of the cursor's path (using Vector path) is inside the image...Right?
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