From 8469bad7487e111c8e5a0ec542f0232a0ebb4bdc Mon Sep 17 00:00:00 2001
From: Martin Haug <mhaug@live.de>
Date: Thu, 4 Feb 2021 21:30:18 +0100
Subject: =?UTF-8?q?Add=20rectangle=20function=20=F0=9F=8E=9B?=
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---
 src/library/insert.rs | 37 +++++++++++++++++++++++++++++++++++++
 src/library/mod.rs    |  1 +
 2 files changed, 38 insertions(+)

(limited to 'src/library')

diff --git a/src/library/insert.rs b/src/library/insert.rs
index 58e8a11c..169fad97 100644
--- a/src/library/insert.rs
+++ b/src/library/insert.rs
@@ -4,6 +4,43 @@ use crate::env::{ImageResource, ResourceId};
 use crate::layout::*;
 use crate::prelude::*;
 
+/// `rect`: Layout content into a rectangle that also might have a fill.
+///
+/// # Named arguments
+/// - Width of the box:  `width`, of type `linear` relative to parent width.
+/// - Height of the box: `height`, of type `linear` relative to parent height.
+pub fn rect(ctx: &mut EvalContext, args: &mut Args) -> Value {
+    let snapshot = ctx.state.clone();
+
+    let width = args.get(ctx, "width");
+    let height = args.get(ctx, "height");
+    let color = args.get(ctx, "color");
+
+    let dirs = ctx.state.dirs;
+    let align = ctx.state.align;
+
+    ctx.start_content_group();
+
+    if let Some(body) = args.find::<ValueTemplate>(ctx) {
+        body.eval(ctx);
+    }
+
+    let children = ctx.end_content_group();
+
+    let fill_if = |c| if c { Expansion::Fill } else { Expansion::Fit };
+    let expand = Spec::new(fill_if(width.is_some()), fill_if(height.is_some()));
+
+    ctx.push(NodeRect {
+        width,
+        height,
+        color,
+        child: NodeStack { dirs, align, expand, children }.into(),
+    });
+
+    ctx.state = snapshot;
+    Value::None
+}
+
 /// `image`: Insert an image.
 ///
 /// Supports PNG and JPEG files.
diff --git a/src/library/mod.rs b/src/library/mod.rs
index 48da093b..7e20f5fb 100644
--- a/src/library/mod.rs
+++ b/src/library/mod.rs
@@ -38,6 +38,7 @@ pub fn new() -> Scope {
     set!(func: "image", image);
     set!(func: "page", page);
     set!(func: "pagebreak", pagebreak);
+    set!(func: "rect", rect);
     set!(func: "rgb", rgb);
     set!(func: "type", type_);
     set!(func: "v", v);
-- 
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