Struct Matrix

Source

pub struct Matrix { /* private fields */ }

Expand description

A transformation matrix for the pdf graphics state.

Matrixes can be created with numerous named constructors and combined by multiplication.

§Examples

canvas.concat(Matrix::translate(10.0, 24.0))?;

// Matrixes can be combined by multiplication:
canvas.concat(Matrix::translate(7.0, 0.0) * Matrix::rotate_deg(45.0))?;
// ... will be visualy identical to:
canvas.concat(Matrix::translate(7.0, 0.0))?;
canvas.concat(Matrix::rotate_deg(45.0))?;

Implementations§

Source §

impl Matrix

Source

pub fn translate(dx: f32, dy: f32) -> Self

Construct a matrix for translation

Examples found in repository ?

examples/mandala.rs (line 19)

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}

Source

pub fn rotate(a: f32) -> Self

Construct a matrix for rotating by a radians.

Examples found in repository ?

examples/mandala.rs (line 31)

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}