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|
use std::f64::consts::SQRT_2;
use std::io;
use decorum::N64;
use super::*;
use crate::diag::Error;
use crate::layout::{
BackgroundNode, BackgroundShape, FixedNode, ImageNode, PadNode, Paint,
};
/// `image`: An image.
pub fn image(ctx: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
let path = args.expect::<Spanned<Str>>("path to image file")?;
let width = args.named("width")?;
let height = args.named("height")?;
let full = ctx.make_path(&path.v);
let id = ctx.images.load(&full).map_err(|err| {
Error::boxed(path.span, match err.kind() {
io::ErrorKind::NotFound => "file not found".into(),
_ => format!("failed to load image ({})", err),
})
})?;
Ok(Value::Template(Template::from_inline(move |_| ImageNode {
id,
width,
height,
})))
}
/// `rect`: A rectangle with optional content.
pub fn rect(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
let width = args.named("width")?;
let height = args.named("height")?;
let fill = args.named("fill")?;
let body = args.eat().unwrap_or_default();
Ok(rect_impl(width, height, None, fill, body))
}
/// `square`: A square with optional content.
pub fn square(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
let length = args.named::<Length>("length")?.map(Linear::from);
let width = match length {
Some(length) => Some(length),
None => args.named("width")?,
};
let height = match width {
Some(_) => None,
None => args.named("height")?,
};
let aspect = Some(N64::from(1.0));
let fill = args.named("fill")?;
let body = args.eat().unwrap_or_default();
Ok(rect_impl(width, height, aspect, fill, body))
}
fn rect_impl(
width: Option<Linear>,
height: Option<Linear>,
aspect: Option<N64>,
fill: Option<Color>,
body: Template,
) -> Value {
Value::Template(Template::from_inline(move |state| {
let mut node = LayoutNode::new(FixedNode {
width,
height,
aspect,
child: body.to_stack(state).into(),
});
if let Some(fill) = fill {
node = LayoutNode::new(BackgroundNode {
shape: BackgroundShape::Rect,
fill: Paint::Color(fill),
child: node,
});
}
node
}))
}
/// `ellipse`: An ellipse with optional content.
pub fn ellipse(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
let width = args.named("width")?;
let height = args.named("height")?;
let fill = args.named("fill")?;
let body = args.eat().unwrap_or_default();
Ok(ellipse_impl(width, height, None, fill, body))
}
/// `circle`: A circle with optional content.
pub fn circle(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
let diameter = args.named("radius")?.map(|r: Length| 2.0 * Linear::from(r));
let width = match diameter {
None => args.named("width")?,
diameter => diameter,
};
let height = match width {
None => args.named("height")?,
width => width,
};
let aspect = Some(N64::from(1.0));
let fill = args.named("fill")?;
let body = args.eat().unwrap_or_default();
Ok(ellipse_impl(width, height, aspect, fill, body))
}
fn ellipse_impl(
width: Option<Linear>,
height: Option<Linear>,
aspect: Option<N64>,
fill: Option<Color>,
body: Template,
) -> Value {
Value::Template(Template::from_inline(move |state| {
// This padding ratio ensures that the rectangular padded region fits
// perfectly into the ellipse.
const PAD: f64 = 0.5 - SQRT_2 / 4.0;
let mut node = LayoutNode::new(FixedNode {
width,
height,
aspect,
child: LayoutNode::new(PadNode {
padding: Sides::splat(Relative::new(PAD).into()),
child: body.to_stack(state).into(),
}),
});
if let Some(fill) = fill {
node = LayoutNode::new(BackgroundNode {
shape: BackgroundShape::Ellipse,
fill: Paint::Color(fill),
child: node,
});
}
node
}))
}
|
