Struct plotters_cairo::CairoBackend

pub struct CairoBackend<'a> { /* fields omitted */ }

The drawing backend that is backed with a Cairo context

Implementations

impl<'a> CairoBackend<'a>

pub fn new(
    context: &'a CairoContext,
    (w, h): (u32, u32)
) -> Result<Self, CairoError>

Trait Implementations

impl<'a> DrawingBackend for CairoBackend<'a>

type ErrorType = CairoError

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<Self::ErrorType>>

Ensure the backend is ready to draw

fn present(&mut self) -> Result<(), DrawingErrorKind<Self::ErrorType>>

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 - point: The backend pixel-based coordinate to draw - color: The color of the pixel

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

Draw a line on the drawing backend - from: The start point of the line - to: The end point of the line - style: The style of the line

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 - upper_left: The coordinate of the upper-left corner of the rect - bottom_right: The coordinate of the bottom-right corner of the rect - style: The style - fill: If the rectangle should be filled

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 - path: The iterator of key points of the path - style: The style of the path

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

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 - center: The center coordinate of the circle - radius: The radius of the circle - style: The style of the shape - fill: If the circle should be filled

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

Draw a text on the drawing backend - text: The text to draw - style: The text style - pos : The text anchor point

fn blit_bitmap(
    &mut self,
    pos: (i32, i32),
    (u32, u32),
    src: &'a [u8]
) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Blit a bitmap on to the backend.