Struct LabelBuilder

pub struct LabelBuilder<Label> { /* private fields */ }

A builder that constructs Rasterizers. Whereas BinaryRasterizer produces an array of booleans, Rasterizer produces an array of some generic type (Label) that implements Copy and Add though typically you’d use a numeric type.

LabelBuilder needs the Label type so the only way to make one is to specify a Label value: the background. The background is the value we’ll use to initialize the raster array – it corresponds to the zero value, so you’ll probably want to start with LabelBuilder::background(0) or LabelBuilder::background(0f32).

In addition to background, width, and height, you can also supply a MergeAlgorithm to specify what the rasterizer should do when two different shapes fill the same pixel. If you don’t supply anything, the rasterizer will use Replace by default.

use geo_rasterize::LabelBuilder;

let mut rasterizer = LabelBuilder::background(0i32).width(4).height(5).build()?;

Implementations

impl<Label> LabelBuilder<Label>

where Label: Copy + Add<Output = Label>,

pub fn background(background: Label) -> Self

pub fn width(self, width: usize) -> Self

pub fn height(self, height: usize) -> Self

pub fn geo_to_pix(self, geo_to_pix: Transform) -> Self

pub fn algorithm(self, algorithm: MergeAlgorithm) -> Self

pub fn build(self) -> Result<Rasterizer<Label>>

Trait Implementations

impl<Label: Clone> Clone for LabelBuilder<Label>

fn clone(&self) -> LabelBuilder<Label>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Label: Debug> Debug for LabelBuilder<Label>

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

Formats the value using the given formatter.

impl<Label: Default> Default for LabelBuilder<Label>

fn default() -> LabelBuilder<Label>

Returns the “default value” for a type.