public BlockCommon getShape(String shapeType, String ID, float posX, float posY, float blockSizeX, float blockSizeY, float angle){
        if(getBlock(ID)!= null){
            remove(ID);
        }
        if(shapeType == null){
            return null;
        }
        if(shapeType.equalsIgnoreCase(SHAPE_RECTANGLE)){
            RectangleBlock rb = new RectangleBlock();
            rb.create(posX, posY, blockSizeX, blockSizeY, angle);
            blocks.add(rb);
            rb.setID(ID);
            return rb;

        } else if(shapeType.equalsIgnoreCase(SHAPE_CURVE)) {
            CurveBlock c = new CurveBlock();
            c.create(posX, posY, blockSizeX, blockSizeY, angle);
            blocks.add(c);
            c.setID(ID);
            return c;


        return null;
    }