58 lines
2.2 KiB
Rust
58 lines
2.2 KiB
Rust
use geo_svg_io::geo_svg_reader::svg_d_path_to_geometry;
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use geo_types::{Coordinate, LineString, MultiPolygon, Polygon};
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use std::error::Error;
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use svg::node::element::tag::Path;
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use svg::parser::Event;
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use svg::Parser;
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/// load a multipolygon dynamically at runtime
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pub fn load_multipolygon_from_svg(path: &str) -> Result<MultiPolygon<f64>, Box<dyn Error>> {
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let mut content = String::new();
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let parser = svg::open(path, &mut content)?;
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parse_svg_to_multipolygon(parser)
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}
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/// load a multipolygon statically at compiletime
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/// with include_str!
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pub fn load_multipolygon_from_svg_include(
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content: &str,
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) -> Result<MultiPolygon<f64>, Box<dyn Error>> {
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let parser = svg::read(content)?;
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parse_svg_to_multipolygon(parser)
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}
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#[allow(non_upper_case_globals)]
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fn parse_svg_to_multipolygon(parser: Parser) -> Result<MultiPolygon<f64>, Box<dyn Error>> {
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let mut result: Vec<Polygon<f64>> = Vec::new();
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for event in parser {
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match event {
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Event::Tag(Path, _, attributes) => {
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let data = attributes.get("d").unwrap();
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let parsed_svg = svg_d_path_to_geometry(&data).ok().unwrap();
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let polygon = parsed_svg.into_polygon().unwrap();
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// both libraries use different versions of geo-types, so we have to map them :facepalm:
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// map interiors
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let mut interiors: Vec<LineString<f64>> = Vec::new();
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for interior_line_string in polygon.interiors().to_vec() {
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let mut new_line_string: Vec<Coordinate<f64>> = Vec::new();
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for i in interior_line_string.into_points() {
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new_line_string.push(Coordinate { x: i.x(), y: i.y() });
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}
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interiors.push(LineString::from(new_line_string));
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}
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// map exteriors
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let mut l: Vec<Coordinate<f64>> = Vec::new();
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for i in polygon.exterior().clone().into_points() {
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l.push(Coordinate { x: i.x(), y: i.y() });
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}
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let exterior = LineString::from(l);
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result.push(Polygon::new(exterior, interiors));
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}
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_ => {}
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}
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}
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Ok(MultiPolygon::from(result))
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}
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