You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rectangle.rs
    path of file: ./repos/printpdf/src
    
    the code of the file until where you have to start completion: //! Utilities for rectangle paths.

use crate::{
    path::{PaintMode, WindingOrder},
    Mm, Point, OP_PATH_CONST_RECT, OP_PATH_PAINT_END, OP_PATH_PAINT_STROKE,
};

/// A helper struct to insert rectangular shapes into a PDF.
///
/// This can be used to paint rectangles or to clip other paths.
#[derive(Debug, Copy, Clone)]
pub struct Rect {
    /// Position of the lower left point of the rectangle, relative to the bottom left corner of
    /// the PDF page in pt.
    pub ll: Point,
    /// Position of the upper right point of the rectangle, relative to the bottom left corner of
    /// the PDF page in pt.
    pub ur: Point,
    /// The paint mode of the rectangle.
    pub mode: PaintMode,
    /// The path-painting/clipping path operator.
    pub winding: WindingOrder,
}

impl Rect {
    /// Create a new point.
    ///
  
    
    pub fn into_stream_op(self) -> Vec<lopdf::content::Operation> {
        use lopdf::content::Operation;

        let width = self.ur.x - self.ll.x;
        let height = self.ur.y - self.ll.y;

        let rect_op = Operation::new(
            OP_PATH_CONST_RECT,
            vec![
                self.ll.x.into(),
                self.ll.y.into(),
                width.into(),
                height.into(),
            ],
        );

        let paint_op = match self.mode {
            PaintMode::Clip => Operation::new(self.winding.get_clip_op(), vec![]),
            PaintMode::Fill => Operation::new(self.winding.get_fill_op(), vec![]),
            PaintMode::Stroke => Operation::new(OP_PATH_PAINT_STROKE, vec![]),
            PaintMode::FillStroke => Operation::new(self.winding.get_fill_stroke_op(), vec![]),
        };

        if matches!(self.mode, PaintMode::Clip) {
            vec![rect_op, paint_op, Operation::new(OP_PATH_PAINT_END, vec![])]
        } else {
            vec![rect_op, paint_op]
        }
    }