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import android.app.Activity; 
          

          

          


          
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import android.content.Context; 
          

          

          


          
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import android.graphics.Canvas; 
          

          

          


          
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import android.graphics.Color; 
          

          

          


          
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import android.graphics.Paint; 
          

          

          


          
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import android.os.Bundle; 
          

          

          


          
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import android.util.DisplayMetrics; 
          

          

          


          
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import android.view.MotionEvent; 
          

          

          


          
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import android.view.View; 
          

          

          


          
10
  
          

          

          


          
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/** 
          

          

          


          
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 * ... 
          

          

          


          
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 *  
          

          

          


          
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 * @author vlinux 
          

          

          


          
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 *  
          

          

          


          
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 */
          

          

          


          
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public class MultiTouchTestActivity extends Activity { 
          

          

          


          
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    /** Called when the activity is first created. */
          

          

          


          
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    @Override
          

          

          


          
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    public void onCreate(Bundle savedInstanceState) { 
          

          

          


          
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        super.onCreate(savedInstanceState); 
          

          

          


          
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        // setContentView(R.layout.main); 
          

          

          


          
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        View view = new MultiTouchView(this); 
          

          

          


          
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        setContentView(view); 
          

          

          


          
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    } 
          

          

          


          
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    class MultiTouchView extends View { 
          

          

          


          
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        private float x1; 
          

          

          


          
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        private float y1; 
          

          

          


          
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        private float x2; 
          

          

          


          
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        private float y2; 
          

          

          


          
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        public MultiTouchView(Context context) { 
          

          

          


          
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            super(context); 
          

          

          


          
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            // TODO Auto-generated constructor stub 
          

          

          


          
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        } 
          

          

          


          
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        @Override
          

          

          


          
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        public boolean onTouchEvent(MotionEvent event) { 
          

          

          


          
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            // TODO Auto-generated method stub 
          

          

          


          
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            float size = event.getSize(); 
          

          

          


          
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            int szi = (int) size; 
          

          

          


          
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            int dxi = szi >> 12; 
          

          

          


          
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            int dyit = ((1 << 12) - 1); 
          

          

          


          
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            int dyi = szi & dyit; 
          

          

          


          
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            DisplayMetrics metrics = getResources().getDisplayMetrics(); 
          

          

          


          
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            float dx = metrics.widthPixels * dxi / (float) dyit; 
          

          

          


          
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            float dy = metrics.heightPixels * dyi / (float) dyit; 
          

          

          


          
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            x1 = event.getX(); 
          

          

          


          
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            y1 = event.getY(); 
          

          

          


          
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            x2 = x1 + dx; 
          

          

          


          
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            y2 = y1 + dy; 
          

          

          


          
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            invalidate(); 
          

          

          


          
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            return true; 
          

          

          


          
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        } 
          

          

          


          
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        @Override
          

          

          


          
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        protected void onDraw(Canvas canvas) { 
          

          

          


          
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            // TODO Auto-generated method stub 
          

          

          


          
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            super.onDraw(canvas); 
          

          

          


          
69
  
          

          

          


          
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            float r = (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) 
          

          

          


          
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                    * (y1 - y2)) / 2; 
          

          

          


          
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            r = 50 >= r ? 50 : r; 
          

          

          


          
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            Paint paint = new Paint(); 
          

          

          


          
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            paint.setColor(Color.BLUE); 
          

          

          


          
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            canvas.drawCircle(x1, y1, r, paint); 
          

          

          


          
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        } 
          

          

          


          
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    } 
          

          

          


          
81
  
          

          

          


          
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}
          
	
          posted on 2011-06-27 22:54 特務小強 閱讀(60) 評論(0)  編輯  收藏  
          

          







          
	    
    




          





          


          

	
          
		
          
				
		
	
		
          
		
		
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