svgcleaner/task/paths/
apply_transform.rs

1// svgcleaner could help you to clean up your SVG files
2// from unnecessary data.
3// Copyright (C) 2012-2018 Evgeniy Reizner
4//
5// This program is free software; you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation; either version 2 of the License, or
8// (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License along
16// with this program; if not, write to the Free Software Foundation, Inc.,
17// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18
19use svgdom::{
20    Transform,
21    FuzzyEq,
22};
23use svgdom::path::{
24    Path,
25    SegmentData,
26};
27
28pub fn apply_transform(path: &mut Path, ts: &Transform) {
29    let (sx, sy) = ts.get_scale();
30
31    // Only proportional scale is supported.
32    debug_assert!(sx.fuzzy_eq(&sy));
33
34    for seg in &mut path.d {
35        match *seg.data_mut() {
36              SegmentData::MoveTo { ref mut x, ref mut y }
37            | SegmentData::LineTo { ref mut x, ref mut y }
38            | SegmentData::SmoothQuadratic { ref mut x, ref mut y } => {
39                ts.apply_ref(x, y);
40            }
41
42            SegmentData::HorizontalLineTo { ref mut x } => {
43                ts.apply_ref(x, &mut 0.0);
44            }
45
46            SegmentData::VerticalLineTo { ref mut y } => {
47                ts.apply_ref(&mut 0.0, y);
48            }
49
50            SegmentData::CurveTo { ref mut x1, ref mut y1, ref mut x2, ref mut y2,
51                                   ref mut x, ref mut y } => {
52                ts.apply_ref(x1, y1);
53                ts.apply_ref(x2, y2);
54                ts.apply_ref(x,  y);
55            }
56
57            SegmentData::SmoothCurveTo { ref mut x2, ref mut y2, ref mut x, ref mut y } => {
58                ts.apply_ref(x2, y2);
59                ts.apply_ref(x,  y);
60            }
61
62            SegmentData::Quadratic { ref mut x1, ref mut y1, ref mut x, ref mut y } => {
63                ts.apply_ref(x1, y1);
64                ts.apply_ref(x,  y);
65            }
66
67            SegmentData::EllipticalArc { ref mut rx, ref mut ry, ref mut x, ref mut y, .. } => {
68                *rx *= sx;
69                *ry *= sx;
70
71                ts.apply_ref(x,  y);
72            }
73
74            SegmentData::ClosePath => {}
75        }
76    }
77}
78
79#[cfg(test)]
80mod tests {
81    use std::str::FromStr;
82
83    use super::*;
84    use svgdom::path::Path;
85    use svgdom::Transform;
86
87    macro_rules! test {
88        ($name:ident, $in_path:expr, $in_ts:expr, $out_text:expr) => (
89            #[test]
90            fn $name() {
91                let mut path = Path::from_str($in_path).unwrap();
92                path.conv_to_absolute();
93
94                let ts = Transform::from_str($in_ts).unwrap();
95
96                apply_transform(&mut path, &ts);
97                assert_eq_text!(path.to_string(), $out_text);
98            }
99        )
100    }
101
102    test!(apply_1, "M 10 20 L 30 40", "translate(10 20)",
103                   "M 20 40 L 40 60");
104}
svgcleaner/task/paths/apply_transform.rs

svgcleaner/task/paths/
apply_transform.rs
