Struct NullBackend 

pub(crate) struct NullBackend;

Trait Implementations

impl RenderBackend for NullBackend

fn draw_rect( &mut self, _xy: Point, _size: Point, _look: &StyleAttr, _properties: Option<String>, _clip: Option<ClipHandle>, )

Draw a rectangle. The top-left point of the rectangle is \p xy. The shape style (color, edge-width) are passed in \p look. The parameter \p clip is an optional clip region (see: create_clip).

fn draw_line( &mut self, _start: Point, _stop: Point, _look: &StyleAttr, _properties: Option<String>, )

Draw a line between \p start and \p stop.

fn draw_circle( &mut self, _xy: Point, _size: Point, _look: &StyleAttr, _properties: Option<String>, )

Draw an ellipse with the center \p xy, and size \p size.

fn draw_text(&mut self, _xy: Point, _text: &str, _look: &StyleAttr)

Draw a labe.

fn draw_arrow( &mut self, _path: &[(Point, Point)], _dashed: bool, _head: (bool, bool), _look: &StyleAttr, _properties: Option<String>, _text: &str, )

Draw an arrow, with a label, with the style parameters in \p look.

fn create_clip(&mut self, _xy: Point, _size: Point, _rounded_px: usize) -> usize

Generate a clip region that shapes can use to create complex shapes.