move Bitmap using onTouch()

viju85 · by **viju85** » Mon Jan 18, 2010 7:11 am

Hi,
I have a checkers board created within the application with all the pieces created using Bitmaps and Canvas.
If i want to move a particular piece on the board, how do i go about it? I have seen a few documentation about onTouch() but i am not able to move the selected bitmap.

Please help as I am very interested in progressing further with the development and i am stuck here for 3 days.

Thanks,
Vj.

zorro · by **zorro** » Mon Jan 18, 2010 12:24 pm

This is an OpenGL section, for Canvas you should probably post elsewhere.
Anyway, you want to move the bitmap with your finger?

viju85 · by **viju85** » Mon Jan 18, 2010 9:36 pm

zorro · by **zorro** » Tue Jan 19, 2010 8:33 am

In your activity class, you have to implement the following method, with a content similar to this:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

 
public boolean onTouchEvent(final MotionEvent event)
 
{
 
        if (event.getAction() == MotionEvent.ACTION_DOWN)
 
        {
 
            x = event.getX();
 
            y = event.getY();
 
           // (...)     
 
        }
 
        if (event.getAction() == MotionEvent.ACTION_MOVE)
 
        {
 
           // (...)
 
        }
 
        if (event.getAction() == MotionEvent.ACTION_UP)
 
        {
 
            x = event.getX();
 
            y = event.getY();
 
           // (...)
 
        }
 
        try
 
        {
 
            Thread.sleep(50);
 
        } 
 
        catch (InterruptedException e)
 
        {
 
        }       
 
}
 
Parsed in 0.032 seconds,  using GeSHi 1.0.8.4

The last block is added to force a 50ms delay to prevent a flood of touch events that will slow down your app. I use OpenGL for rendering, not Canvas, but I presume the touch input code is the same.

viju85 · by **viju85** » Tue Jan 19, 2010 8:45 am

Thanks,
Actually i figured it out.

I actually want to move a bitmap diagonally. I am able to move it wherever i want right now. But i was wondering if there is a way in which i can move the bitmap only in the diagonal direction?

Thanks,
Vj.

hardcoras · by **hardcoras** » Tue Jan 19, 2010 1:30 pm

Move your object by equal steps in both directions.

For example:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

int x = event.getX(); 
 
int y = event.getY(); 
 
int moveBy = x>y?x:y;
 
object.move(moveBy, moveBy);
Parsed in 0.030 seconds,  using GeSHi 1.0.8.4

move Bitmap using onTouch()

move Bitmap using onTouch()

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