private void drawItem(Canvas canvas, PieItem item, float alpha) {
   if (mState == STATE_PIE) {
     if (item.getPath() != null) {
       if (item.isSelected()) {
         Paint p = mSelectedPaint;
         int state = canvas.save();
         float r = getDegrees(item.getStartAngle());
         canvas.rotate(r, mCenter.x, mCenter.y);
         canvas.drawPath(item.getPath(), p);
         canvas.restoreToCount(state);
       }
       alpha = alpha * (item.isEnabled() ? 1 : 0.3f);
       // draw the item view
       item.setAlpha(alpha);
       item.draw(canvas);
     }
   }
 }