Thursday, September 13, 2012

touch draw on Bitmap (android)

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public class MainActivity extends Activity implements OnTouchListener {

 ImageView imageView;
 Bitmap bitmap;
 Canvas canvas;
 Paint paint;

 float bx = 0;
 float by = 0;
 float dx = 0;
 float dy = 0;
 float ex = 0;
 float ey = 0;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

  Display currentDisplay = getWindowManager().getDefaultDisplay();
  float dw = currentDisplay.getWidth();
  float dh = currentDisplay.getHeight();

  bitmap = Bitmap.createBitmap((int) dw, (int) dh,Bitmap.Config.ARGB_8888);
  canvas = new Canvas(bitmap);
  paint = new Paint();
  paint.setColor(Color.BLACK);
        
  imageView = new ImageView(this);
  imageView.setImageBitmap(bitmap);
  imageView.setOnTouchListener(this);
  setContentView(imageView);
 }
    
    public boolean onTouch(View v, MotionEvent event) {
     int action = event.getAction();
     switch (action) {
      case MotionEvent.ACTION_DOWN:
       bx = event.getX();
       by = event.getY();
       break;
      case MotionEvent.ACTION_MOVE:
       canvas.drawLine(bx, by, event.getX(), event.getY(), paint);
       imageView.invalidate();
       bx = event.getX();
       by = event.getY();
       break;
      case MotionEvent.ACTION_UP:
       break;
      case MotionEvent.ACTION_CANCEL:
       break;
      default:
       break;
     }
     return true;
    }  
}



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