Trait DotMatrixGfx

Source

pub trait DotMatrixGfx {
    // Required methods
    fn is_spooling(&self) -> bool;
    fn lines_buffered(&self) -> usize;
    fn clear(&mut self);
    fn write_svg_dot_gfx_lines(
        &self,
        description: &str,
        target: &mut dyn Write,
    ) -> Result<bool>;
    fn write_gfx_data(&mut self, target: &mut Vec<u8>) -> Option<(u32, u32)>;

    // Provided method
    fn is_empty(&self) -> bool { ... }
}

Expand description

A trait for dot matrix printer spoolers that can produce monochromatic images.

This trait defines an interface for the emulator program to be able to produce buffered images.

Required Methods§

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fn is_spooling(&self) -> bool

Returns true if the printer is currently capturing data. Returns false otherwise.

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fn lines_buffered(&self) -> usize

Returns an approximate number of graphic lines already buffered.

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fn clear(&mut self)

Clears the buffered image data.

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fn write_svg_dot_gfx_lines( &self, description: &str, target: &mut dyn Write, ) -> Result<bool>

Renders already buffered image data as an SVG image written to the provided target. Returns Ok(true) if an image has been rendered. If there was no image data spooled, returns Ok(false).

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fn write_gfx_data(&mut self, target: &mut Vec<u8>) -> Option<(u32, u32)>

Renders already buffered image data as a monochrome 8-bit greyscale image data. Returns Some(width, height) if an image has been rendered. If there was no image data spooled, returns None.

You may use image crate to render an actual image in some popular format:

let mut buf: Vec<u8> = Vec::new();
if let Some((width, height)) = printer.write_gfx_data(&mut buf) {
    let img = image::ImageBuffer::<image::Luma<u8>, _>::from_vec(width, height, buf);
    img.save("printed.png").unwrap();
    // or alternatively
    image::save_buffer("printed.png", &buf, width, height, image::ColorType::L8).unwrap();
}