為什么繪制的臉部矩形，位置顯示不正確。顯示在頭上，而不再臉上？

	private?void?drawBitmap(Bitmap?bitmap,?FaceDetail?detail)?{
		Bitmap?createBitmap?=?Bitmap.createBitmap(bitmap.getWidth(),
				bitmap.getHeight(),?bitmap.getConfig());
		int?bitmapWidth?=?createBitmap.getWidth();
		int?bitmapHeight?=?createBitmap.getHeight();
		Canvas?canvas?=?new?Canvas(createBitmap);

		Paint?paint?=?getPaint(bitmap);
		canvas.drawBitmap(bitmap,?0,?0,?null);

		float?center_x?=??(float)?detail.getFace().get(0).getPosition()
				.getCenter().getX();
		float?center_y?=??(float)?detail.getFace().get(0).getPosition()
				.getCenter().getY();
		float?image_width?=??(float)?detail.getFace().get(0).getPosition()
				.getWidth();
		float?image_height?=??(float)?detail.getFace().get(0).getPosition()
				.getHeight();

		float?face_with?=?(float)?(image_width?/?100?*?bitmapWidth);
		float?face_height?=?(float)?(image_height?/?100?*?bitmapHeight);
		float?center_width?=?(float)?(center_x?/?100?*?bitmapWidth);
		float?center_height?=?(float)?(center_y?/?100?*?bitmapHeight);
		canvas.drawLine(center_width?-?face_with/2,?center_y?-?face_height/2,
				center_width?+?face_with/2,?center_y?-?face_height/2,?paint);
		canvas.drawLine(center_width?-?face_with/2,?center_y?-?face_height/2,
				center_width?-?face_with/2,?center_y?+?face_height/2,?paint);
		canvas.drawLine(center_width?+?face_with/2,?center_y?+?face_height/2,
				center_width?+?face_with/2,?center_y?-?face_height/2,?paint);
		canvas.drawLine(center_width?+?face_with/2,?center_y?+?face_height/2,
				center_width?-?face_with/2,?center_y?+?face_height/2,?paint);
		canvas.drawCircle(center_width,?center_height,?10,?paint);
		choseMap?=?createBitmap;
		image.setImageBitmap(choseMap);
	}