associating_data.md

Associating Data

We can associate points, lines, or rectangles with a custom data. We use GeomWithData to define new types that contain our custom data.

type PointWithName = GeomWithData<(i32, i32), String>;

The example defines a new type PointWithName that associates a point with a String. Then we can use this type to construct objects that can be searched later.

The complete code is presented below:

use rstar::{primitives::GeomWithData, RTree};

fn main() {
    type PointWithName = GeomWithData<(i32, i32), String>;

    let p1 = PointWithName::new((0, 0), "A".into());
    let p2 = PointWithName::new((2, 1), "B".into());

    let tree = RTree::bulk_load(vec![p1, p2]);

    println!("{:?}", tree.nearest_neighbors(&(2, 2)));
}

Output:

[GeomWithData { geom: (2, 1), data: "B" }]

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