embedded-graphics-simulator 0.2.0

//! # Example: Custom font
//!
//! Shows how to implement the `Font` trait for a custom `SeventSegmentFont` font. This font renders
//! numbers only and emulates a classic 7 segment display.

use embedded_graphics::{egtext, pixelcolor::BinaryColor, prelude::*, text_style};
use embedded_graphics_simulator::{
    BinaryColorTheme, OutputSettingsBuilder, SimulatorDisplay, Window,
};

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
struct SevenSegmentFont;

impl Font for SevenSegmentFont {
    const FONT_IMAGE: &'static [u8] = include_bytes!("assets/seven-segment-font.raw");
    const FONT_IMAGE_WIDTH: u32 = 224;

    const CHARACTER_SIZE: Size = Size::new(22, 40);
    const CHARACTER_SPACING: u32 = 4;

    fn char_offset(c: char) -> u32 {
        c.to_digit(10).unwrap_or(0)
    }
}

fn main() -> Result<(), core::convert::Infallible> {
    let mut display: SimulatorDisplay<BinaryColor> = SimulatorDisplay::new(Size::new(128, 128));

    let position = Point::new(27, 22);
    let row_offset = Point::new(0, 44);

    egtext!(
        text = "123",
        top_left = position,
        style = text_style!(font = SevenSegmentFont, text_color = BinaryColor::On,)
    )
    .draw(&mut display)?;

    egtext!(
        text = "456",
        top_left = position + row_offset,
        style = text_style!(font = SevenSegmentFont, text_color = BinaryColor::On,)
    )
    .draw(&mut display)?;

    let output_settings = OutputSettingsBuilder::new()
        .theme(BinaryColorTheme::OledBlue)
        .build();
    Window::new("Custom font", &output_settings).show_static(&display);

    Ok(())
}