Struct Canvas2dChartBackend 

pub struct Canvas2dChartBackend { /* private fields */ }

The Canvas2D rendering backend.

This is the universal fallback: it works in every browser, including ones with neither WebGPU nor WebGL2. It replays the display list as immediate-mode canvas calls, which is slower than the GPU backends but produces exactly the same picture.

Implementations

impl Canvas2dChartBackend

Inherent implementation of Canvas2dChartBackend.

pub fn create(canvas: &HtmlCanvasElement) -> Option<Self>

Creates a backend around the given canvas.

Returns None when the canvas cannot give out a 2D context — in practice, when the canvas already has a WebGPU or WebGL context.

Arguments

• &HtmlCanvasElement - Shared reference to a HtmlCanvasElement.

Returns

• Option<Self> - Some(...) on success, None otherwise.

pub fn canvas(&self) -> &HtmlCanvasElement

Returns the canvas the backend draws into.

Returns

• &HtmlCanvasElement - A HtmlCanvasElement value.

pub fn dpr(&self) -> f64

Returns the device pixel ratio the backend renders at.

Returns

• f64 - A 64-bit float.

Trait Implementations

impl ChartBackend for Canvas2dChartBackend

Implements ChartBackend for Canvas2dChartBackend.

fn kind(&self) -> BackendKind

Implements the kind operation on Canvas2dChartBackend.

Returns

• BackendKind - A BackendKind value.

fn resize(&mut self, width: f64, height: f64, dpr: f64)

Implements the resize operation on Canvas2dChartBackend.

Arguments

• f64 - A 64-bit float (f64).

fn render(&mut self, list: &DisplayList, shaper: &mut TextShaper)

Implements the render operation on Canvas2dChartBackend.

Arguments

• &DisplayList - Shared reference to a DisplayList.
• &mut TextShaper - Mutable reference to a TextShaper (mutated in place).

fn dispose(&mut self)

Implements the dispose operation on Canvas2dChartBackend.

impl Clone for Canvas2dChartBackend

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 Canvas2dChartBackend

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

Formats the value using the given formatter.