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Can anyone please help. I am currently writing a Android game where the player should be able to touch and drag a "Barrier" accross the screen. I can drag the barrier (bitmap) accross the screen, but the trouble is when I add more than one barrier and drag one, they all drag together and to the same location. I simply want to be able to click and drag one barrier at a time.
I have included my code for the MainGamePanel as well as for my barrier class. Can anyone see where I am going wrong and point me in the right direction please. Sorry for all the code I included, but I thought Id include what I have to be thourough.
My MainGamePanel class, runs a Thread
- Code: Select all
public class MainGamePanel extends SurfaceView implements SurfaceHolder.Callback, SensorEventListener {
// Initialising the Main Thread
private MainThread thread;
// Initialising the Barrier
private Barrier barrier[] = new Barrier[3];
// The Main Game Panel
public MainGamePanel(Context context) {
super(context);
// Adding a call-back (this) to the surfaceHolder to intercept events
getHolder().addCallback(this);
// The starting coordinates of the Barrier
int x = 30;
int y = 270;
barrier[0] = new Barrier(BitmapFactory.decodeResource(getResources(), R.drawable.blue_barrier), x, y);
barrier[1] = new Barrier(BitmapFactory.decodeResource(getResources(), R.drawable.green_barrier), x + 15, y);
barrier[2] = new Barrier(BitmapFactory.decodeResource(getResources(), R.drawable.pink_barrier), x + 30, y);
// Create the Game Loop Thread
thread = new MainThread(getHolder(), this);
// Make the GamePanel focusable so it can handle events
setFocusable(true);
}
// Handles the touch events
public boolean onTouchEvent(MotionEvent event)
{
int eventAction = event.getAction();
int x = (int)event.getX();
int y = (int)event.getY();
switch (eventAction)
{
// Touch down so check if finger is on Barrier
case MotionEvent.ACTION_DOWN:
for (int i = 0; i < barrier.length; i++)
{
if (barrier[i] == barrier[0])
{
if (x > barrier[0].getX() && x < barrier[0].getX() + 32
&& y > barrier[0].getX() && y < barrier[0].getY() + 32)
{
}
} // end if
else if (barrier[i] == barrier[1])
{
if (x > barrier[1].getX() && x < barrier[1].getX() + 32
&& y > barrier[1].getX() && y < barrier[1].getY() + 32)
{
}
//} // end else if
else if (barrier[i] == barrier[2])
{
if (x > barrier[2].getX() && x < barrier[2].getX() + 32
&& y > barrier[2].getX() && y < barrier[2].getY() + 32)
{
}
//} // end else if
//} // end for
break;
case MotionEvent.ACTION_MOVE: // Touch-drag with the Barrier
// Move the Barrier the same as the finger
for (int i = 0; i < barrier.length; i++)
{
if (barrier[i] == barrier[0])
{
barrier[0].setX(x);
barrier[0].setY(y);
} // end if
else if (barrier[i] == barrier[1])
{
barrier[1].setX(x);
barrier[1].setY(y);
}
else if (barrier[i] == barrier[2])
{
barrier[2].setX(x);
barrier[2].setY(y);
} // end else if
} // end for break;
case MotionEvent.ACTION_UP:
// Finger no longer on Barrier
// ******** THESE LINES CRASH THE PROGRAM WHEN FINGER RELEASED
barrier[1].setTouched(false);
barrier[2].setTouched(false);
barrier[3].setTouched(false);
break;
}
return true;
}
// Render - Draws the Game Item Bitmaps to the screen
public void render(Canvas canvas)
{
// Set the background to white
canvas.drawColor(Color.WHITE);
barrier[0].draw(canvas);
barrier[1].draw(canvas);
barrier[2].draw(canvas);
}
// Update
// This is the Game's update method
// It iterates through all the Objects and calls their update() methods (if they have one)
public void update()
{
// Nothing here for the barrier
} // end update
public void surfaceCreated(SurfaceHolder holder)
{
// The surface is created - Start the Game Loop
thread.setRunning(true);
thread.start();
}
}
And my Barrier Class
- Code: Select all
public class Barrier extends GameObject {
// The Bitmap image of the Barrier
private Bitmap bitmap;
// The Barriers X and Y coordinates
private int x, y;
// The Barrier is touched
private boolean touched;
// My PhysiX Class
private PhysiX physiX;
// Constructor
public Barrier(Bitmap bitmap, int x, int y)
{
this.bitmap = bitmap;
this.x = x;
this.y = y;
this.physiX = new PhysiX();
}
// Getters and Setters
public Bitmap getBitmap()
{
return bitmap;
}
public void setBitmap(Bitmap bitmap)
{
this.bitmap = bitmap;
}
public int getX()
{
return x;
}
public void setX(int x)
{
this.x = x;
}
public int getY()
{
return y;
}
public void setY(int y)
{
this.y = y;
}
public PhysiX getPhysiX()
{
return physiX;
}
public void setPhysiX(PhysiX physiX)
{
this.physiX = physiX;
}
public boolean isTouched()
{
return touched;
}
public void setTouched(boolean touched)
{
this.touched = touched;
}
// Draw method
public void draw(Canvas canvas)
{
canvas.drawBitmap(bitmap, x - (bitmap.getWidth() / 2), y - (bitmap.getHeight() / 2), null);
}
// Update method
public void update()
{
if (touched)
{
x += (physiX.getXv() * physiX.getxDirection());
y += (physiX.getYv() * physiX.getyDirection());
}
}
/**Handles the MotionEvent.ACTION_DOWN event.
* If the event happens on the
* bitmap surface then the touched state is set to true otherwise to false
*/
public void handleActionDown(int eventX, int eventY)
{
if (eventX >= (x - bitmap.getWidth() / 2) && (eventX <= (x + bitmap.getWidth() / 2)))
{
if ( eventY >= (y - bitmap.getHeight() / 2) && (eventY <= (y - bitmap.getHeight() / 2)))
{
// The Barrier is touched
setTouched(true);
}
else
setTouched(false);
}
else
{
setTouched(false);
} // end else
}
}
