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plotters 0.1.11

Plot Drawing Library in Pure Rust for both native and WASM applications
Documentation 
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/// The implementation of an actual font implmentation
///
/// This exists since for the image rendering task, we want to use
/// the system font. But in wasm application, we want the browser
/// to handle all the font issue.
///
/// Thus we need different mechanism for the font implementation

#[cfg(not(target_arch = "wasm32"))]
mod ttf;

#[cfg(not(target_arch = "wasm32"))]
#[allow(unused_imports, dead_code)]
use ttf::FontDataInternal;

#[cfg(target_arch = "wasm32")]
mod web;
#[cfg(target_arch = "wasm32")]
use web::FontDataInternal;

mod font;
pub use font::*;

pub trait FontData: Clone {
    type ErrorType: Sized + std::error::Error + Clone;
    fn new(face: &str) -> Result<Self, Self::ErrorType>;
    fn estimate_layout(
        &self,
        size: f64,
        text: &str,
    ) -> Result<((i32, i32), (i32, i32)), Self::ErrorType>;
    fn draw<E, DrawFunc: FnMut(i32, i32, f32) -> Result<(), E>>(
        &self,
        _pos: (i32, i32),
        _size: f64,
        _text: &str,
        _draw: DrawFunc,
    ) -> Result<Result<(), E>, Self::ErrorType> {
        panic!("The font implementation is unable to rasterize font");
    }
}