Struct GeometryValues 

pub struct GeometryValues { /* private fields */ }

Parsed (decoded) geometry data

Implementations

impl GeometryValues

pub fn feature_count(&self) -> usize

pub fn vector_types(&self) -> &[GeometryType]

Geometry types for each feature, in insertion order.

pub fn geometry_offsets(&self) -> Option<&[u32]>

Cumulative offsets into part_offsets for multi-geometry types. None when no multi-geometry features are present.

pub fn part_offsets(&self) -> Option<&[u32]>

Cumulative offsets into ring_offsets (or directly into vertices for LineString layers without rings). None for pure Point layers.

pub fn ring_offsets(&self) -> Option<&[u32]>

Cumulative offsets into the vertex buffer (counting whole vertices). None when no ring-level indirection is needed.

pub fn index_buffer(&self) -> Option<&[u32]>

Triangle index buffer produced by Earcut tessellation, three indices per triangle. Each index names a vertex of the whole layer, so the buffer can go to a GPU as is. None unless the GeometryValues was created with Self::new_tessellated.

pub fn triangle_offsets(&self) -> Option<&[u32]>

Cumulative triangle counts, one run per polygon feature, starting at 0. None unless the GeometryValues was created with Self::new_tessellated.

pub fn vertices(&self) -> Option<&[i32]>

Flat vertex buffer in tile coordinates: [x0, y0, x1, y1, …], or [x0, y0, z0, …] when [Self::z_step] is set.

pub fn stride(&self) -> usize

How many words of Self::vertices each vertex takes.

pub fn vertex_range(&self, index: usize) -> MltResult<Range<usize>>

The range of the layer’s vertex sequence that feature index owns.

The sequence is every vertex of every feature in feature order, which is what the vertex buffer holds and what an m-value column runs over. A ring’s closing vertex is not stored, so it is not in the range either.

pub fn vertex_count(&self, index: usize) -> MltResult<usize>

How many vertices feature index owns, see Self::vertex_range.

pub fn to_geojson(&self, index: usize) -> MltResult<Geometry<i32>>

Build a GeoJSON geometry for a single feature at index i. Polygon and MultiPolygon rings are closed per GeoJSON spec (MLT omits the closing vertex).

impl GeometryValues

pub fn write_to(self, enc: &mut Encoder, codecs: &mut Codecs) -> MltResult<()>

Write the geometry column to enc.

impl GeometryValues

pub fn new_tessellated() -> Self

Returns a GeometryValues with its triangle offsets pre-initialized.

When they are Some, polygon push methods automatically compute and store Earcut tessellation data as geometries are added. Use Self::default when tessellation is not required.

pub fn with_geom(self, geom: &Geometry<i32>) -> Self

Add a geometry to this decoded geometry collection. This is the reverse of to_geojson - it converts a &Geometry<i32> into the internal MLT representation with offset arrays.

pub fn push_geom(&mut self, geom: &Geometry<i32>)

Add a geometry to this decoded geometry collection (mutable version).

Its vertices are (x, y) pairs, so it must come before [Self::add_z].

Trait Implementations

impl Analyze for GeometryValues

fn collect_statistic(&self, stat: StatType) -> usize

fn for_each_stream(&self, _cb: &mut dyn FnMut(StreamMeta))

Call cb with the StreamMeta of every stream contained in self. Default implementation is a no-op (types that hold no streams).

impl Clone for GeometryValues

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GeometryValues

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for GeometryValues

fn default() -> Self

Returns the “default value” for a type.

impl Eq for GeometryValues

impl PartialEq for GeometryValues

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for GeometryValues