document-svg 2.0.2

Convert PDF, Word, Excel, PowerPoint, diagram and CAD files into one SVG per page, locally — a Rust library and the docsvg command
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

//! SVG to G-code (CNC & Laser Cutter toolpath) reverse converter.

use std::io::Write;

use crate::cad::svg_reader::{SvgElement, parse_svg_elements};
use crate::error::Result;

/// Converts SVG document content to standard G-code toolpaths for CNC routers and laser cutters.
pub fn write_svg_to_gcode<W: Write>(svg_content: &str, mut writer: W) -> Result<()> {
    let doc = parse_svg_elements(svg_content)?;
    let view_height = doc.height;

    let mut polylines: Vec<Vec<(f64, f64)>> = Vec::new();

    for elem in doc.elements {
        match elem {
            SvgElement::Line { p1, p2, .. } => {
                if p1.x.is_finite() && p1.y.is_finite() && p2.x.is_finite() && p2.y.is_finite() {
                    polylines.push(vec![(p1.x, view_height - p1.y), (p2.x, view_height - p2.y)]);
                }
            }
            SvgElement::Rect {
                x,
                y,
                width,
                height,
                ..
            } => {
                if x.is_finite()
                    && y.is_finite()
                    && width.is_finite()
                    && height.is_finite()
                    && width > 0.0
                    && height > 0.0
                {
                    let y0 = view_height - y;
                    let y1 = view_height - (y + height);
                    polylines.push(vec![
                        (x, y0),
                        (x + width, y0),
                        (x + width, y1),
                        (x, y1),
                        (x, y0),
                    ]);
                }
            }
            SvgElement::Circle { center, radius, .. } => {
                if center.x.is_finite()
                    && center.y.is_finite()
                    && radius.is_finite()
                    && radius > 0.0
                {
                    let dy = view_height - center.y;
                    let segments = crate::cad::DEFAULT_CIRCLE_SEGMENTS;
                    let mut circle_pts = Vec::with_capacity(segments + 1);
                    for i in 0..=segments {
                        let theta = (i as f64) * std::f64::consts::TAU / (segments as f64);
                        circle_pts
                            .push((center.x + radius * theta.cos(), dy + radius * theta.sin()));
                    }
                    polylines.push(circle_pts);
                }
            }
            SvgElement::Polyline {
                points, is_closed, ..
            } => {
                let mut pts: Vec<(f64, f64)> = points
                    .into_iter()
                    .filter(|p| p.x.is_finite() && p.y.is_finite())
                    .map(|p| (p.x, view_height - p.y))
                    .collect();
                if pts.len() >= 2 {
                    if is_closed
                        && pts.first() != pts.last()
                        && let Some(&first) = pts.first()
                    {
                        pts.push(first);
                    }
                    polylines.push(pts);
                }
            }
            SvgElement::Text { .. } => {}
        }
    }

    // Standard RS-274D / LinuxCNC / GRBL G-code program preamble
    writeln!(writer, "(Generated by document-svg)")?;
    writeln!(writer, "G21 (Units in millimeters)")?;
    writeln!(writer, "G90 (Absolute distance mode)")?;
    writeln!(writer, "G17 (XY plane selection)")?;
    writeln!(writer, "G94 (Feedrate per minute)")?;
    writeln!(writer, "G00 Z5.000 (Safe clearance height)")?;

    for (idx, poly) in polylines.iter().enumerate() {
        if poly.len() < 2 {
            continue;
        }
        let start = poly[0];
        writeln!(
            writer,
            "
(--- Toolpath #{idx} ---)"
        )?;
        // Rapid traverse to start of contour
        writeln!(writer, "G00 X{:.3} Y{:.3}", start.0, start.1)?;
        // Turn on spindle / laser
        writeln!(writer, "M03 S1000")?;
        writeln!(writer, "G01 Z0.000 F300.0 (Engage material)")?;

        // Cut path
        for pt in &poly[1..] {
            writeln!(writer, "G01 X{:.3} Y{:.3} F1200.0", pt.0, pt.1)?;
        }

        // Retract & turn off
        writeln!(writer, "M05")?;
        writeln!(writer, "G00 Z5.000")?;
    }

    // Return home & end program
    writeln!(
        writer,
        "
(--- End of program ---)"
    )?;
    writeln!(writer, "M05")?;
    writeln!(writer, "G00 Z10.000")?;
    writeln!(writer, "G00 X0.000 Y0.000")?;
    writeln!(writer, "M02")?;

    Ok(())
}