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Index › Programming Questions & Help › Programs › selecting points from an array
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selecting points from an array (Read 497 times)
G_Rasputin
selecting points from an array
Apr 19th, 2007, 6:56pm  
Hello People,

i have a logic problem, which i can't get solved:

I have an array with ~500 entries (Coordinates)
Now i want to move the mouse and always when the
mouse koordinates are equal (or in a range) of one
or more coordinates from the array the programm should
return the position of the equal coordinate(s) in the array.

I thought to make it like this, but it needs too much performance
and i don't know if it is corrrect:

....
void draw(){

for(i = 0; i < array.length; i++){

if(mouseX == array[i].x && mouseY == array[i].y){

// equal xposition

}

}

}
....

i am struggling with this problem a lot now. I would
be VERY VERY happy if someone might have a idea etc.
to solve this.

Thank you very much!
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fjen
Re: selecting points from an array
Reply #1 - Apr 19th, 2007, 7:49pm  
does that make sense? say mouseXY is 5 and 10 .. now you are running thru the array to find two _equal_ values 5 and 10 and return them? what's wrong with the mouse-coords in the first place? what are you really trying to do, returning the array index? are you looking for collision with the mouse?

edit: if you are just trying to find out if the coords are in the array at all, then you can simplify this:
Code:

boolean arr = new boolean[width*height];
// to get or set a value at x,y use:
//  arr[x+y* width] = ...
// let's assume you've set values in there, now you can just check:
if ( arr[mouseX+mouseY*width] ) { /*do something here ... */ };

F
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