geometry

qgis_render::geometry

The geometry vocabulary used across the library: the Geometry type plus the supporting value types.

use qgis_render::geometry::*;

Contents

Item	Description
Geometry	Vector geometry with GEOS-backed operations.
GeometryType	Point, LineString, Polygon, multi- variants, GeometryCollection, CircularString.
Point	A single x, y, optional z and m.
Extent	Axis-aligned bounding box.
Vertex	Iterator over the vertices of a geometry.

Extent

Extent is the bounding box that appears in project, layer, feature, and render APIs.

let extent = Extent::new(14.0, 50.0, 15.0, 51.0);   // minx, miny, maxx, maxy

extent.width()               // 1.0
extent.height()              // 1.0
extent.center()              // Point
extent.contains(&point)      // bool
extent.intersects(&other)    // bool
extent.combine_with(&other)  // union of two boxes
extent.scale(1.1)            // grow around the center

Parse one from the minx,miny,maxx,maxy form used by the CLI:

let extent = Extent::from_str("14,50,15,51")?;

Point

let p = Point::new(14.0, 50.0);
let p3d = Point::new_z(14.0, 50.0, 320.0);

p.x();  p.y();  p.z();       // z() -> Option<f64>

Iterating vertices

for vertex in geom.vertices() {
    println!("{} {}", vertex.x, vertex.y);
}

Conversions

Function	Description
Geometry::from_wkt / to_wkt	Well-known text.
Geometry::from_wkb / to_wkb	Well-known binary.
Geometry::from_geojson / to_geojson	GeoJSON via serde_json::Value.

See also

• Geometry — the geometry type in detail
• Crs — units and reprojection
• features — bounding_box and intersects filters