49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
use std::f32::consts::PI;
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use anyhow::Result;
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use rtchallenge::{
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canvas::Canvas,
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matrices::Matrix4x4,
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tuples::{Color, Tuple},
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};
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fn draw_dot(c: &mut Canvas, x: usize, y: usize) {
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let red = Color::new(1., 0., 0.);
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c.set(x.saturating_sub(1), y.saturating_sub(1), red);
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c.set(x, y.saturating_sub(1), red);
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c.set(x + 1, y.saturating_sub(1), red);
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c.set(x.saturating_sub(1), y, red);
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c.set(x, y, red);
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c.set(x + 1, y, red);
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c.set(x.saturating_sub(1), y + 1, red);
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c.set(x, y + 1, red);
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c.set(x + 1, y + 1, red);
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}
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fn main() -> Result<()> {
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let w = 200;
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let h = w;
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let mut c = Canvas::new(w, h);
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let t = Matrix4x4::translate(0., 0.75, 0.);
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let p = Tuple::point(0., 0., 0.);
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let rot_hour = Matrix4x4::rotation_z(-PI / 6.);
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let mut p = t * p;
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let w = w as f32;
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let h = h as f32;
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let h_w = w / 2.0;
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let h_h = h / 2.0;
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for _ in 0..12 {
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let x = (h_w + h_w * p.x) as usize;
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// Y-axis is 0 at the top, and h at the bottom, flip it.
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let y = (h - (h_h + h_h * p.y)) as usize;
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draw_dot(&mut c, x, y);
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p = rot_hour * p;
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}
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let path = "/tmp/eoc4.png";
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println!("saving output to {}", path);
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c.write_to_file(path)?;
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Ok(())
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}
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