42 lines
966 B
Rust
42 lines
966 B
Rust
use std::io::{Result, Write};
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use nalgebra::Vector3;
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/// A pixel color represented by a red, green, and blue value in the range 0-1.
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pub type Color = Vector3<f64>;
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/// A representation of an image
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pub struct Image {
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/// Width in pixels
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pub width: usize,
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/// Height in pixels
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pub height: usize,
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/// Pixel data in row-major form.
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pub data: Vec<Color>,
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}
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impl Image {
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/// Write the image in PPM format to a file.
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pub fn write(&self, mut w: impl Write) -> Result<()> {
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// Header
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let header = format!("P3 {} {} 255\n", self.width, self.height);
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w.write_all(header.as_bytes())?;
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// Pixel data
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assert_eq!(self.data.len(), self.width * self.height);
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for pixel in self.data.iter() {
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let pixel = pixel * 256.0;
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let red = pixel.x as u8;
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let green = pixel.y as u8;
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let blue = pixel.z as u8;
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let pixel = format!("{red} {green} {blue}\n");
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w.write_all(pixel.as_bytes())?;
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}
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Ok(())
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}
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}
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