Drop flatgeobuf dependency in geozero crate (#235)

Solves flatgeobuf/flatgeobuf#283

Cargo.toml

@@ -43,7 +43,6 @@ hex = "0.4"
 kdbush = "0.2"
 log = "0.4.19"
 lyon = "1.0.1"
-polylabel = "2.5"
 postgis = "0.9.0"
 postgres = "0.19"
 postgres-types = "0.2"

README.md

@@ -70,23 +70,6 @@ println!("{}", fgb.to_json()?);
 Full source code: [geojson.rs](./geozero/tests/geojson.rs)
 
 
-Read FlatGeobuf data as geo-types geometries and calculate label position with [polylabel-rs](https://github.com/urschrei/polylabel-rs):
-```rust,ignore
-let mut file = BufReader::new(File::open("countries.fgb")?);
-let mut fgb = FgbReader::open(&mut file)?.select_all()?;
-while let Some(feature) = fgb.next()? {
-    let name: String = feature.property("name").unwrap();
-    if let Ok(Geometry::MultiPolygon(mpoly)) = feature.to_geo() {
-        if let Some(poly) = &mpoly.0.iter().next() {
-            let label_pos = polylabel(&poly, &0.10).unwrap();
-            println!("{name}: {label_pos:?}");
-        }
-    }
-}
-```
-Full source code: [polylabel.rs](./geozero/tests/polylabel.rs)
-
-
 ## PostGIS usage examples
 
 Select and insert geo-types geometries with rust-postgres. Requires the `with-postgis-postgres` feature:
@@ -189,7 +172,7 @@ geometry.process(&mut vertex_counter, GeometryType::MultiPolygon)?;
 ```
 Full source code: [geozero-api.rs](./geozero/tests/geozero-api.rs)
 
-Find maximal height in 3D polygons:
+Find maximal height in 3D points:
 ```rust,ignore
 struct MaxHeightFinder(f64);
 
@@ -205,10 +188,8 @@ impl GeomProcessor for MaxHeightFinder {
 }
 
 let mut max_finder = MaxHeightFinder(0.0);
-while let Some(feature) = fgb.next()? {
-    let geometry = feature.geometry().unwrap();
-    geometry.process(&mut max_finder, GeometryType::MultiPolygon)?;
-}
+points.process_geom(&mut max_finder)?;
+assert_eq!(max_finder.0, 457.1);
 ```
 Full source code: [geozero-api.rs](./geozero/tests/geozero-api.rs)
 

geozero/Cargo.toml

@@ -57,11 +57,9 @@ sqlx = { workspace = true, optional = true }
 wkt = { workspace = true, optional = true }
 
 [dev-dependencies]
-flatgeobuf.workspace = true
 geo.workspace = true
 hex.workspace = true
 kdbush.workspace = true
-polylabel.workspace = true
 postgres.workspace = true
 seek_bufread.workspace = true
 sqlx = { workspace = true, features = ["runtime-tokio-native-tls", "macros", "time", "postgres", "sqlite"] }
@@ -83,7 +81,7 @@ required-features = ["with-gdal"]
 [[test]]
 name = "geojson"
 path = "tests/geojson.rs"
-required-features = ["with-geojson"]
+required-features = ["with-geojson", "with-wkt"]
 
 [[test]]
 name = "geopackage"
@@ -103,7 +101,7 @@ required-features = ["with-geo", "with-geojson"]
 [[test]]
 name = "geozero-api"
 path = "tests/geozero-api.rs"
-required-features = []
+required-features = ["with-wkt"]
 
 [[test]]
 name = "kdbush"
@@ -115,11 +113,6 @@ name = "mvt"
 path = "tests/mvt.rs"
 required-features = ["with-mvt", "with-geo", "with-geojson"]
 
-[[test]]
-name = "polylabel"
-path = "tests/polylabel.rs"
-required-features = ["with-geo"]
-
 [[test]]
 name = "postgis"
 path = "tests/postgis.rs"

geozero/tests/geojson.rs

@@ -1,38 +1,17 @@
-use flatgeobuf::{FgbReader, HttpFgbReader};
-use geozero::geojson::GeoJsonWriter;
-use geozero::ProcessToJson;
-use seek_bufread::BufReader;
-use std::fs::File;
-use std::io::BufWriter;
+use geozero::{wkt::Wkt, ToJson};
 type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
 
 #[test]
-fn fgb_to_geojson() -> Result<()> {
-    let mut filein = BufReader::new(File::open("tests/data/countries.fgb")?);
-    let mut fgb = FgbReader::open(&mut filein)?.select_bbox(8.8, 47.2, 9.5, 55.3)?;
-    let json = fgb.to_json()?;
+fn wkt_to_geojson_feature() -> Result<()> {
+    let wkt = Wkt("MULTIPOLYGON (((40 40, 20 45, 45 30, 40 40)),
+                         ((35 10, 45 45, 15 40, 10 20, 35 10),
+                         (20 30, 35 35, 30 20, 20 30)))");
+    let json = wkt.to_json()?;
+
+    println!("{json}");
     assert_eq!(
-        &json[0..215],
-        r#"{
-"type": "FeatureCollection",
-"name": "countries",
-"features": [{"type": "Feature", "properties": {"id": "DNK", "name": "Denmark"}, "geometry": {"type": "MultiPolygon", "coordinates": [[[[12.690006,55.609991],[12.0"#
+        &json,
+        r#"{"type": "MultiPolygon", "coordinates": [[[[40,40],[20,45],[45,30],[40,40]]],[[[35,10],[45,45],[15,40],[10,20],[35,10]],[[20,30],[35,35],[30,20],[20,30]]]]}"#
     );
     Ok(())
 }
-
-#[allow(dead_code)]
-// #[tokio::test]
-async fn http_fbg_to_json() -> Result<()> {
-    let url = "https://flatgeobuf.org/test/data/countries.fgb";
-    let mut fgb = HttpFgbReader::open(url)
-        .await?
-        .select_bbox(8.8, 47.2, 9.5, 55.3)
-        .await?;
-
-    let mut fout = BufWriter::new(File::create("countries.json")?);
-    let mut json = GeoJsonWriter::new(&mut fout);
-    fgb.process_features(&mut json).await?;
-
-    Ok(())
-}

geozero/tests/geozero-api.rs

@@ -1,8 +1,6 @@
-use flatgeobuf::{FallibleStreamingIterator as _, FeatureProperties as _, FgbReader, GeometryType};
 use geozero::error::Result as GeozeroResult;
-use geozero::{ColumnValue, CoordDimensions, GeomProcessor, PropertyProcessor};
-use seek_bufread::BufReader;
-use std::fs::File;
+use geozero::wkt::Wkt;
+use geozero::{CoordDimensions, GeomProcessor, GeozeroGeometry};
 
 struct VertexCounter(u64);
 
@@ -17,14 +15,13 @@ impl GeomProcessor for VertexCounter {
 
 #[test]
 fn vertex_counter() -> Result<()> {
-    let mut filein = BufReader::new(File::open("tests/data/countries.fgb")?);
-    let mut fgb = FgbReader::open(&mut filein)?.select_bbox(8.8, 47.2, 9.5, 55.3)?;
-    let feature = fgb.next()?.unwrap();
-    let geometry = feature.geometry().unwrap();
+    let wkt = Wkt("MULTIPOLYGON (((40 40, 20 45, 45 30, 40 40)),
+                         ((35 10, 45 45, 15 40, 10 20, 35 10),
+                         (20 30, 35 35, 30 20, 20 30)))");
 
     let mut vertex_counter = VertexCounter(0);
-    geometry.process(&mut vertex_counter, GeometryType::MultiPolygon)?;
-    assert_eq!(vertex_counter.0, 24);
+    wkt.process_geom(&mut vertex_counter)?;
+    assert_eq!(vertex_counter.0, 13);
 
     Ok(())
 }
@@ -60,22 +57,19 @@ impl GeomProcessor for MaxHeightFinder {
 }
 
 #[test]
-#[ignore]
 fn max_height_finder() -> Result<()> {
-    let mut filein = BufReader::new(File::open(
-        "tests/data/geoz_lod1_gebaeude_max_3d_extract.fgb",
-    )?);
-    let mut fgb = FgbReader::open(&mut filein)?.select_all()?;
+    let points = Wkt("MULTIPOINTZ (10 40 200.0, 40 30 150.0, 20 20 457.1, 30 10 0.0)");
     let mut max_finder = MaxHeightFinder(0.0);
-    while let Some(feature) = fgb.next()? {
-        let geometry = feature.geometry().unwrap();
-        geometry.process(&mut max_finder, GeometryType::MultiPolygon)?;
-    }
+    points.process_geom(&mut max_finder)?;
     assert_eq!(max_finder.0, 457.1);
 
     Ok(())
 }
 
+/*
+// Broken: this example does work with Flatgeobuf, but not GeoJson
+// Disabled, since we don't want to have a circular dependency between flatgeobuf and geozero
+
 struct FeatureFinder;
 
 impl PropertyProcessor for FeatureFinder {
@@ -86,20 +80,25 @@ impl PropertyProcessor for FeatureFinder {
 
 #[test]
 fn feature_finder() -> Result<()> {
-    let mut filein = BufReader::new(File::open("tests/data/countries.fgb")?);
-    let mut fgb = FgbReader::open(&mut filein)?.select_all()?;
+    let mut filein = BufReader::new(File::open("tests/data/countries.geojson")?);
+    let mut json = GeoJsonLineReader::new(&mut filein);
 
     let mut finder = FeatureFinder {};
-    while let Some(feature) = fgb.next()? {
-        let found = feature.process_properties(&mut finder);
-        if found.is_err() || found.unwrap() {
-            break;
-        }
-    }
-    let feature = fgb.cur_feature();
-    let props = feature.properties()?;
-    assert_eq!(props["id"], "DNK".to_string());
-    assert_eq!(props["name"], "Denmark".to_string());
+    // process_properties is not public. We should have feature iterators for all `GeozeroDatasource`s!
+    // json.process_properties(&mut finder);
+    //
+    // Using FgbReader:
+    // while let Some(feature) = fgb.next()? {
+    //     let found = feature.process_properties(&mut finder);
+    //     if found.is_err() || found.unwrap() {
+    //         break;
+    //     }
+    // }
+    // let feature = fgb.cur_feature();
+    // let props = feature.properties()?;
+    // assert_eq!(props["id"], "DNK".to_string());
+    // assert_eq!(props["name"], "Denmark".to_string());
 
     Ok(())
 }
+*/

geozero/tests/svg.rs

@@ -1,10 +1,6 @@
-use flatgeobuf::{FgbReader, Header};
 use geozero::geojson::GeoJsonReader;
-use geozero::svg::SvgWriter;
 use geozero::ProcessToSvg;
-use seek_bufread::BufReader;
 use std::fs::File;
-use std::io::Write;
 type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
 
 #[test]
@@ -23,6 +19,16 @@ fn json_to_svg() -> Result<()> {
     Ok(())
 }
 
+/*
+// FlatgeoBuf to SVG conversion
+// Disabled, since we don't want to have a circular dependency between flatgeobuf and geozero
+
+
+use flatgeobuf::{FgbReader, Header};
+use geozero::svg::SvgWriter;
+use seek_bufread::BufReader;
+use std::io::Write;
+
 fn invert_y(header: &Header) -> bool {
     if let Some(crs) = header.crs() {
         if crs.code() == 4326 {
@@ -69,3 +75,4 @@ fn fgb_to_svg() -> Result<()> {
 
     Ok(())
 }
+*/