CODEWITHSUNDEEP
javaandroidlibgdxtouch
Kevin Bryan
Kevin Bryan

Reputation: 1858

How to detect number of fingers being used?

I'm making a game using Libgdx, I need to know if the user is using two fingers and if they are placed in the correct position. One finger should be on the right side of the screen and the other in the left side of the screen.

Upvotes: 3

Views: 1054

Answers (3)

m.antkowicz
m.antkowicz

Reputation: 13581

the easiest solution without using any listeners is to just iterate over some count of pointers and calling simple Gdx.input.isTouched() - you have to set some "maximum pointers count" but hey - peoples usually has only 20 fingers :)

    final int MAX_NUMBER_OF_POINTERS = 20;
    int pointers = 0;

    for(int i = 0; i < MAX_NUMBER_OF_POINTERS; i++)
    {  
        if( Gdx.input.isTouched(i) ) pointers++;
    }

    System.out.println( pointers );

due to reference:

Whether the screen is currently touched by the pointer with the given index. Pointers are indexed from 0 to n. The pointer id identifies the order in which the fingers went down on the screen, e.g. 0 is the first finger, 1 is the second and so on. When two fingers are touched down and the first one is lifted the second one keeps its index. If another finger is placed on the touch screen the first free index will be used.

you can also easily the position of touching pointer by using Gdx.input.getX() and Gdx.input.getY() like

    final int MAX_NUMBER_OF_POINTERS = 20;
    int pointers = 0;

    for(int i = 0; i < MAX_NUMBER_OF_POINTERS; i++)
    {  
        if( Gdx.input.isTouched(i) )
        {
            x = Gdx.input.getX(i);
            y = Gdx.input.getY(i)
        }
    }

and then you can for example put it into array

Upvotes: 5

EssEllDee
EssEllDee

Reputation: 167

Both GestureListener and InputProcessor have the touchDown method. This has the x and y value for each finger on the screen (pointer). Implement either one of these and you can override the touchdown to suit your needs. This is a great tutorial to start with. Hope this helps.

Upvotes: 1

Skizo-ozᴉʞS ツ
Skizo-ozᴉʞS ツ

Reputation: 20646

How to detect number of fingers being used?

You can do it with MotionEvent with getPointerCount()

You can detect how many fingers are on the screen doing this : 

int PointerCount = event.getPointerCount();

I need to know if the user is using two fingers and if they are placed in the correct position

You can get the X,Y and compare it.

@Override
public boolean onTouch(View v, MotionEvent event) {
   int x = event.getX();
   int y = event.getY();
   return true;
}

For more information you can check MotionEvent Documentation so you can get there what you want.

Upvotes: 1

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