From d9aa659010f8ffd443133657cca6c541097cc1aa Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Mon, 6 Oct 2025 00:12:59 +0200
Subject: fix arrow tip; scrollable pages

---
 server/tools/src/book_html.css  |  1 +
 server/tools/src/diagram_svg.rs | 18 +++++++++++-------
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/server/tools/src/book_html.css b/server/tools/src/book_html.css
index fb60eb60..d64e9ef1 100644
--- a/server/tools/src/book_html.css
+++ b/server/tools/src/book_html.css
@@ -37,4 +37,5 @@ body {
     aspect-ratio: 0.707;
     width: 30em;
     height: auto;
+    overflow-y: auto;
 }
\ No newline at end of file
diff --git a/server/tools/src/diagram_svg.rs b/server/tools/src/diagram_svg.rs
index a5d09316..0fc75668 100644
--- a/server/tools/src/diagram_svg.rs
+++ b/server/tools/src/diagram_svg.rs
@@ -72,21 +72,25 @@ pub fn diagram_svg(data: &Gamedata, diagram: &Diagram) -> Result<String> {
         let src_node = &diagram.nodes[edge.src];
         let dst_node = &diagram.nodes[edge.dst];
         let src = node_edge_connect_pos(src_node, dst_node);
-        let dst = node_edge_connect_pos(dst_node, src_node);
+        let mut dst = node_edge_connect_pos(dst_node, src_node);
+
+        let dir = (src - dst).normalize_or_zero();
+        let tip0 = dst;
+        let tip1 = dst + (dir + dir.perp() * 0.5) * 10.;
+        let tip2 = dst + (dir + dir.perp() * -0.5) * 10.;
+        dst += dir * 5.; // prevent miter line cap from peeking out
+
+        // line path
         writeln!(
             out,
             r#"<path fill="none" stroke="black" stroke-width="2" d="M{} {} L{} {}" />"#,
             src.x, src.y, dst.x, dst.y,
         )?;
-
-        // Array tip
-        let dir = (src - dst).normalize_or_zero();
-        let c1 = dst + (dir + dir.perp() * 0.5) * 10.;
-        let c2 = dst + (dir + dir.perp() * -0.5) * 10.;
+        // tip path
         writeln!(
             out,
             r#"<path fill="black" stroke="none" d="M{} {} L{} {} L{} {} Z" />"#,
-            dst.x, dst.y, c1.x, c1.y, c2.x, c2.y
+            tip0.x, tip0.y, tip1.x, tip1.y, tip2.x, tip2.y
         )?;
     }
 
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