cumulus3d-core 0.11.0

Core types for cumulus3d: camera models, rigid/similarity transforms, reconstruction graph, feature store, RANSAC, PLY/GPS I/O
Documentation 
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/*
 * gps.rs
 *
 * Copyright (c) 2026 ParkSangWoo
 *
 * Author(s):
 *
 *      ParkSangWoo <dev.parksangwoo@gmail.com>
 *
 *
 * This file is part of cumulus3d.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

//! GPS reference file: one line per entry, `name latitude longitude altitude`

use crate::error::{Error, Result};
use std::path::Path;

#[derive(Clone, Debug, PartialEq)]
/// One line of a GPS reference file (image name and position).
pub struct GpsRecord {
    /// Image name (relative path).
    pub name: String,
    /// Degrees (decimal).
    pub lat: f64,
    /// Longitude, degrees (decimal).
    pub lon: f64,
    /// Meters.
    pub alt: f64,
}

/// Reads preserving file order (the first line is the ENU origin). Blank lines are skipped; there is no comment syntax (a `#` line is an
/// error).
pub fn read_gps_file(path: impl AsRef<Path>) -> Result<Vec<GpsRecord>> {
    let path = path.as_ref();
    let text = std::fs::read_to_string(path)?;
    parse_gps(&text, path)
}

pub(crate) fn parse_gps(text: &str, path: &Path) -> Result<Vec<GpsRecord>> {
    let mut out = Vec::new();
    for (ln, line) in text.lines().enumerate() {
        let line = line.trim();
        if line.is_empty() {
            continue;
        }
        let f: Vec<&str> = line.split_whitespace().collect();
        // Design decision: a line with more than 4 fields is treated as an error.
        if f.len() != 4 {
            return Err(Error::parse(path, ln + 1, format!("필드 4개 필요, {}개", f.len())));
        }
        let num = |s: &str| s.parse::<f64>().map_err(|_| Error::parse(path, ln + 1, format!("숫자 아님: {s}")));
        out.push(GpsRecord { name: f[0].to_string(), lat: num(f[1])?, lon: num(f[2])?, alt: num(f[3])? });
    }
    Ok(out)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse() {
        let t = "camF/a.jpg 37.5 127.0 50\n\n  camR/b.jpg 37.5001 127.0001 60.5  \n";
        let r = parse_gps(t, Path::new("x")).unwrap();
        assert_eq!(r.len(), 2);
        assert_eq!(r[1], GpsRecord { name: "camR/b.jpg".into(), lat: 37.5001, lon: 127.0001, alt: 60.5 });
        assert!(parse_gps("# c\n", Path::new("x")).is_err());
        assert!(parse_gps("a 1 2\n", Path::new("x")).is_err());
    }
}