[−][src]Trait plotters_backend::BackendTextStyle
The trait that abstracts a style of a text.
This is used because the the backend crate have no knowledge about how the text handling is implemented in plotters.
But the backend still wants to know some information about the font, for
the backend doesn't handles text drawing, may want to call the draw
method which
is implemented by the plotters main crate. While for the backend that handles the
text drawing, those font information provides instructions about how the text should be
rendered: color, size, slant, anchor, font, etc.
This trait decouples the detailed implementaiton about the font and the backend code which wants to perfome some operation on the font.
Associated Types
Loading content...Required methods
fn family(&self) -> FontFamily<'_>
fn layout_box(
&self,
text: &str
) -> Result<((i32, i32), (i32, i32)), Self::FontError>
&self,
text: &str
) -> Result<((i32, i32), (i32, i32)), Self::FontError>
fn draw<E, DrawFunc: FnMut(i32, i32, BackendColor) -> Result<(), E>>(
&self,
text: &str,
pos: BackendCoord,
draw: DrawFunc
) -> Result<Result<(), E>, Self::FontError>
&self,
text: &str,
pos: BackendCoord,
draw: DrawFunc
) -> Result<Result<(), E>, Self::FontError>