133 lines
4.1 KiB
Rust
133 lines
4.1 KiB
Rust
use std::f64::consts::SQRT_2;
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use decorum::N64;
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use super::*;
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use crate::layout::{
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BackgroundNode, BackgroundShape, FixedNode, ImageNode, PadNode, Paint,
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};
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/// `image`: An image.
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pub fn image(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
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let path = args.expect::<Spanned<String>>(ctx, "path to image file");
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let width = args.named(ctx, "width");
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let height = args.named(ctx, "height");
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let mut node = None;
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if let Some(path) = &path {
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if let Some((resolved, _)) = ctx.resolve(&path.v, path.span) {
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if let Some(id) = ctx.cache.image.load(ctx.loader, &resolved) {
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node = Some(ImageNode { id, width, height });
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} else {
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ctx.diag(error!(path.span, "failed to load image"));
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}
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}
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}
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Value::template(move |ctx| {
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if let Some(node) = node {
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ctx.push_into_par(node);
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}
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})
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}
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/// `rect`: A rectangle with optional content.
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pub fn rect(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
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let width = args.named(ctx, "width");
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let height = args.named(ctx, "height");
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let fill = args.named(ctx, "fill");
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let body = args.eat(ctx).unwrap_or_default();
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rect_impl(width, height, None, fill, body)
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}
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/// `square`: A square with optional content.
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pub fn square(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
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let length = args.named::<Length>(ctx, "length").map(Linear::from);
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let width = length.or_else(|| args.named(ctx, "width"));
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let height = width.is_none().then(|| args.named(ctx, "height")).flatten();
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let fill = args.named(ctx, "fill");
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let body = args.eat(ctx).unwrap_or_default();
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rect_impl(width, height, Some(N64::from(1.0)), fill, body)
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}
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fn rect_impl(
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width: Option<Linear>,
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height: Option<Linear>,
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aspect: Option<N64>,
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fill: Option<Color>,
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body: TemplateValue,
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) -> Value {
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Value::template(move |ctx| {
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let mut stack = ctx.exec_template_stack(&body);
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stack.aspect = aspect;
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let fixed = FixedNode { width, height, child: stack.into() };
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if let Some(fill) = fill {
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ctx.push_into_par(BackgroundNode {
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shape: BackgroundShape::Rect,
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fill: Paint::Color(fill),
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child: fixed.into(),
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});
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} else {
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ctx.push_into_par(fixed);
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}
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})
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}
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/// `ellipse`: An ellipse with optional content.
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pub fn ellipse(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
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let width = args.named(ctx, "width");
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let height = args.named(ctx, "height");
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let fill = args.named(ctx, "fill");
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let body = args.eat(ctx).unwrap_or_default();
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ellipse_impl(width, height, None, fill, body)
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}
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/// `circle`: A circle with optional content.
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pub fn circle(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
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let radius = args.named::<Length>(ctx, "radius").map(|r| 2.0 * Linear::from(r));
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let width = radius.or_else(|| args.named(ctx, "width"));
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let height = width.is_none().then(|| args.named(ctx, "height")).flatten();
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let fill = args.named(ctx, "fill");
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let body = args.eat(ctx).unwrap_or_default();
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ellipse_impl(width, height, Some(N64::from(1.0)), fill, body)
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}
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fn ellipse_impl(
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width: Option<Linear>,
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height: Option<Linear>,
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aspect: Option<N64>,
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fill: Option<Color>,
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body: TemplateValue,
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) -> Value {
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Value::template(move |ctx| {
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// This padding ratio ensures that the rectangular padded region fits
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// perfectly into the ellipse.
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const PAD: f64 = 0.5 - SQRT_2 / 4.0;
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let mut stack = ctx.exec_template_stack(&body);
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stack.aspect = aspect;
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let fixed = FixedNode {
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width,
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height,
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child: PadNode {
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padding: Sides::splat(Relative::new(PAD).into()),
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child: stack.into(),
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}
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.into(),
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};
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if let Some(fill) = fill {
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ctx.push_into_par(BackgroundNode {
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shape: BackgroundShape::Ellipse,
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fill: Paint::Color(fill),
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child: fixed.into(),
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});
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} else {
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ctx.push_into_par(fixed);
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}
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})
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}
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