Bevy rectangle with border mesh

quad_with_border.rs

fn quad_with_border(size: Vec2, border_size: Vec2, color: &Color, border_color: &Color) -> Mesh {
    let extent = size / 2.;
    let inner_extent = (size - border_size) / 2.;

    let color = color.as_rgba_f32();
    let border_color = border_color.as_rgba_f32();

    let vertices = [
        ([-extent.x, -extent.y, 0.0], border_color),
        ([-extent.x, extent.y, 0.0], border_color),
        ([extent.x, extent.y, 0.0], border_color),
        ([extent.x, -extent.y, 0.0], border_color),
        //
        ([-inner_extent.x, -inner_extent.y, 0.0], color),
        ([-inner_extent.x, inner_extent.y, 0.0], color),
        ([inner_extent.x, inner_extent.y, 0.0], color),
        ([inner_extent.x, -inner_extent.y, 0.0], color),
    ];

    let indices = Indices::U32(vec![
        0, 2, 1, 0, 3, 2, //
        4, 6, 5, 4, 7, 6,
    ]);

    let positions: Vec<_> = vertices.iter().map(|(p, _)| *p).collect();
    let colors: Vec<_> = vertices.iter().map(|(_, c)| *c).collect();

    let mut mesh = Mesh::new(PrimitiveTopology::TriangleList);
    mesh.set_indices(Some(indices));
    mesh.insert_attribute(Mesh::ATTRIBUTE_POSITION, positions);
    mesh.insert_attribute(Mesh::ATTRIBUTE_COLOR, colors);
    mesh
}