Struct ConrodBackend

pub struct ConrodBackend<'a, 'b> { /* private fields */ }

The Conrod drawing backend

Implementations

impl<'a, 'b> ConrodBackend<'a, 'b>

pub fn new( ui: &'a mut UiCell<'b>, size: (u32, u32), parent: Id, font: Id, graph: &'a mut ConrodBackendReusableGraph, ) -> Self

Create a new Conrod backend drawer, with:

• ui: the UiCell that was derived from Ui for this frame
• (plot_width, plot_height): the size of your plot in pixels (make sure it matches its parent canvas size)
• ids.parent: the widget::Id of the canvas that contains your plot (of the same size than the plot itself)
• fonts.regular: the font::Id of the font to use to draw text (ie. a Conrod font identifier)
• conrod_graph: a mutable reference to the graph instance you built outside of the drawing loop (pass it as a mutable reference)

Trait Implementations

impl<'a, 'b> DrawingBackend for ConrodBackend<'a, 'b>

type ErrorType = ConrodBackendError

The error type reported by the backend

fn get_size(&self) -> (u32, u32)

Get the dimension of the drawing backend in pixels

fn ensure_prepared( &mut self, ) -> Result<(), DrawingErrorKind<ConrodBackendError>>

Ensure the backend is ready to draw

fn present(&mut self) -> Result<(), DrawingErrorKind<ConrodBackendError>>

Finalize the drawing step and present all the changes. This is used as the real-time rendering support. The backend may implement in the following way, when ensure_prepared is called it checks if it needs a fresh buffer and present is called rendering all the pending changes on the screen.

fn draw_pixel( &mut self, _point: BackendCoord, _color: BackendColor, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a pixel on the drawing backend

fn draw_line<S: BackendStyle>( &mut self, from: BackendCoord, to: BackendCoord, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a line on the drawing backend

fn draw_rect<S: BackendStyle>( &mut self, upper_left: BackendCoord, bottom_right: BackendCoord, style: &S, fill: bool, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a rectangle on the drawing backend

fn draw_path<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>( &mut self, path: I, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a path on the drawing backend

fn draw_circle<S: BackendStyle>( &mut self, center: BackendCoord, radius: u32, style: &S, fill: bool, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a circle on the drawing backend

fn fill_polygon<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>( &mut self, vert: I, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

fn draw_text<S: BackendTextStyle>( &mut self, text: &str, style: &S, pos: BackendCoord, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a text on the drawing backend

fn estimate_text_size<S: BackendTextStyle>( &self, text: &str, style: &S, ) -> Result<(u32, u32), DrawingErrorKind<Self::ErrorType>>

Estimate the size of the horizontal text if rendered on this backend. This is important because some of the backend may not have font ability. Thus this allows those backend reports proper value rather than ask the font rasterizer for that.

fn blit_bitmap( &mut self, _pos: BackendCoord, (_iw, _ih): (u32, u32), _src: &[u8], ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Blit a bitmap on to the backend.