qrcode-rs 0.3.0

QR code encoder in Rust，Generate QR Code matrices and images in RAW, PNG and SVG formats.
Documentation 
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//! EPS rendering support.
//!
//! # Example
//!
//! ```
//! use qrcode_rs::QrCode;
//! use qrcode_rs::render::eps;
//!
//! let code = QrCode::new(b"Hello").unwrap();
//! let eps = code.render::<eps::Color>().build();
//! println!("{eps}");
//! ```

#![cfg(feature = "eps")]

use std::fmt::Write;

use crate::render::{Canvas as RenderCanvas, Pixel};
use crate::types::Color as ModuleColor;

/// An EPS color (`[R, G, B]`).
///
/// Each value must be in the range of 0.0 to 1.0.
#[derive(Copy, Clone, Default, PartialEq, PartialOrd)]
pub struct Color(pub [f64; 3]);

impl Pixel for Color {
    type Canvas = Canvas;
    type Image = String;

    fn default_color(color: ModuleColor) -> Self {
        Self(color.select(Default::default(), [1.0; 3]))
    }
}

#[doc(hidden)]
pub struct Canvas {
    eps: String,
    height: u32,
}

impl RenderCanvas for Canvas {
    type Pixel = Color;
    type Image = String;

    fn new(width: u32, height: u32, dark_pixel: Color, light_pixel: Color) -> Self {
        Self {
            eps: format!(
                concat!(
                    "%!PS-Adobe-3.0 EPSF-3.0\n",
                    "%%BoundingBox: 0 0 {w} {h}\n",
                    "%%Pages: 1\n",
                    "%%EndComments\n",
                    "gsave\n",
                    "{bgr} {bgg} {bgb} setrgbcolor\n",
                    "0 0 {w} {h} rectfill\n",
                    "grestore\n",
                    "{fgr} {fgg} {fgb} setrgbcolor\n"
                ),
                w = width,
                h = height,
                fgr = dark_pixel.0[0],
                fgg = dark_pixel.0[1],
                fgb = dark_pixel.0[2],
                bgr = light_pixel.0[0],
                bgg = light_pixel.0[1],
                bgb = light_pixel.0[2],
            ),
            height,
        }
    }

    fn draw_dark_pixel(&mut self, x: u32, y: u32) {
        self.draw_dark_rect(x, y, 1, 1);
    }

    fn draw_dark_rect(&mut self, left: u32, top: u32, width: u32, height: u32) {
        let bottom = self.height - top;
        writeln!(self.eps, "{left} {bottom} {width} {height} rectfill").unwrap();
    }

    fn into_image(mut self) -> String {
        self.eps.push_str("%%EOF");
        self.eps
    }
}