piet 0.8.0

An abstraction for 2D graphics.
Documentation 
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// Copyright 2019 the Piet Authors
// SPDX-License-Identifier: Apache-2.0 OR MIT

//! range attributes should override default attributes

use crate::kurbo::{Size, Vec2};
use crate::{
    Color, Error, FontFamily, FontStyle, FontWeight, RenderContext, Text, TextAttribute,
    TextLayout, TextLayoutBuilder,
};

pub const SIZE: Size = Size::new(240., 280.);

static TEXT: &str = r#"Philosophers often behave like little children who scribble some marks on a piece of paper at random and then ask the grown-up "What's that?" — It happened like this: the grown-up had drawn pictures for the child several times and said "this is a man," "this is a house," etc. And then the child makes some marks too and asks: what's this then?"#;

const RED: Color = Color::rgb8(255, 0, 0);
const BLUE: Color = Color::rgb8(0, 0, 255);

pub fn draw<R: RenderContext>(rc: &mut R) -> Result<(), Error> {
    rc.clear(None, Color::WHITE);
    let text = rc.text();
    let courier = text
        .font_family("Courier New")
        .unwrap_or(FontFamily::MONOSPACE);
    let layout = text
        .new_text_layout(TEXT)
        .max_width(200.0)
        .default_attribute(courier)
        .default_attribute(TextAttribute::Underline(true))
        .default_attribute(FontStyle::Italic)
        .default_attribute(TextAttribute::TextColor(RED))
        .default_attribute(FontWeight::BOLD)
        .range_attribute(..200, TextAttribute::TextColor(BLUE))
        .range_attribute(10..100, FontWeight::NORMAL)
        .range_attribute(20..50, TextAttribute::Strikethrough(true))
        .range_attribute(40..300, TextAttribute::Underline(false))
        .range_attribute(60..160, FontStyle::Regular)
        .range_attribute(140..220, FontWeight::NORMAL)
        .range_attribute(240.., FontFamily::SYSTEM_UI)
        .build()?;

    let y_pos = ((SIZE.height - layout.size().height) / 2.0).max(0.0);
    let text_pos = Vec2::new(16.0, y_pos);
    rc.draw_text(&layout, text_pos.to_point());

    Ok(())
}