mandala/
mandala.rs

1///! Example program drawing mandalas on a page.
2extern crate pdf_canvas;
3
4use pdf_canvas::graphicsstate::{Color, Matrix};
5use pdf_canvas::Pdf;
6use std::env;
7use std::f32::consts::PI;
8
9/// Create a `mandala.pdf` file.
10fn main() {
11    // Open our pdf document.
12    let mut document = Pdf::create("mandala.pdf").expect("Create PDF file");
13    let mut args = env::args().skip(1);
14    let n: u8 = args.next().map(|s| s.parse().expect("number")).unwrap_or(7);
15
16    // Render a page with something resembling a mandala on it.
17    document
18        .render_page(600.0, 600.0, |c| {
19            c.concat(Matrix::translate(300., 300.))?;
20            c.set_stroke_color(Color::gray(0))?;
21            let segment = 2. * PI / n as f32;
22            for _i in 0..n {
23                c.move_to(0., 33.5)?;
24                c.line_to(0., 250.)?;
25                let r = 99.;
26                c.circle(0., r, r * 1.25 * segment)?;
27                let d = 141.4;
28                let rr = 36.;
29                c.circle(0., d + rr, rr)?;
30                c.stroke()?;
31                c.concat(Matrix::rotate(segment))?;
32            }
33            c.concat(Matrix::rotate(segment / 2.))?;
34            for _i in 0..n {
35                let mut r0 = 58.66;
36                let mut r = 0.7705 * r0 * segment;
37                for _j in 0..(n + 1) / 3 {
38                    c.circle(0., r0, r)?;
39                    let r2 = 1.058 * r;
40                    r0 = r0 + r + r2;
41                    r = r2;
42                }
43                c.stroke()?;
44                c.concat(Matrix::rotate(segment))?;
45            }
46
47            Ok(())
48        })
49        .unwrap();
50    document.finish().unwrap();
51}
mandala/mandala.rs

mandala/
mandala.rs
