From 7ec6a9f8e02cac92f0d2ce8c450ab49a648320f0 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 31 Oct 2026 23:36:38 +0100
Subject: dashboard: make transports curved

---
 src/api/dashboard/dashboard.html | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/api/dashboard/dashboard.html b/src/api/dashboard/dashboard.html
index f544f51..784fdb6 100644
--- a/src/api/dashboard/dashboard.html
+++ b/src/api/dashboard/dashboard.html
@@ -794,12 +794,17 @@ function renderGraph() {
         stroke: "var(--bad)", "stroke-opacity": .5, "stroke-width": width + 4,
         "stroke-linecap": "round" }));
     }
+    // The one in use drawn last: on top of the others where they meet, at the nodes.
+    const drawnLines = [];
     lines.forEach((line, i) => {
-      // 0, then +1, -1, +2, -2 … steps of 6 px to the side.
+      // 0, then +1, -1, +2, -2 … steps of 6 px to the side, at the middle: from node to
+      // node, each bowing out that far (a quadratic curve, its control point twice as
+      // far out); `aside(t)`, how far out at `t` along.
       const side = i === 0 ? 0 : (i % 2 ? 1 : -1) * Math.ceil(i / 2) * 6;
-      const ox = nx * side, oy = ny * side;
-      const attrs = { x1: p.x + ox, y1: p.y + oy, x2: q.x + ox, y2: q.y + oy,
-        stroke: colourOf(line.transport),
+      const aside = t => 4 * t * (1 - t) * side;
+      const cx = (p.x + q.x) / 2 + nx * side * 2, cy = (p.y + q.y) / 2 + ny * side * 2;
+      const attrs = { d: "M " + p.x + " " + p.y + " Q " + cx + " " + cy + " " + q.x + " " + q.y,
+        fill: "none", stroke: colourOf(line.transport),
         // Narrow where dormant or down (over its underlay).
         "stroke-width": broken ? (line.used ? 1.5 : 0.8) : line.used ? 3 : 1.2 };
       // Dotted where an end reports nothing, dashed where relayed, solid where direct.
@@ -809,7 +814,7 @@ function renderGraph() {
       } else if (line.used ? link.relayed : line.relayed) {
         attrs["stroke-dasharray"] = "7 4";
       }
-      const drawnLine = drawing("line " + key + " " + i, "line", attrs);
+      const drawnLine = drawing("path " + key + " " + i, "path", attrs);
       const description = name(a) + " – " + name(b) +
         (line.transport ? " via " + line.transport : "") + (line.used ? " (in use)" : "") +
         ((line.used ? link.relayed : line.relayed) ? ", relayed" : "") + (link.dormant ? ", dormant" : "") +
@@ -819,7 +824,7 @@ function renderGraph() {
         ", measured " + age(secsAgo + elapsed()) + " ago";
       tooltip(drawnLine, description);
       descriptions.push(description);
-      children.push(drawnLine);
+      drawnLines.push(drawnLine);
       if (typeof line.rttMs === "number") {
         // Near the end that measured it (`a`, whose report is drawn), clear of its
         // node and name, and short of the middle: the one in use larger, the others
@@ -828,14 +833,15 @@ function renderGraph() {
         const t = (line.used ? along : Math.max(24, along * .6)) / length;
         const out = line.used ? -4 : Math.sign(side) * 9;
         const rtt = drawing("rtt " + key + " " + i, "text", upright({
-          x: p.x + (q.x - p.x) * t + ox + nx * out,
-          y: p.y + (q.y - p.y) * t + oy + ny * out + (line.used ? 0 : 3),
+          x: p.x + (q.x - p.x) * t + nx * (aside(t) + out),
+          y: p.y + (q.y - p.y) * t + ny * (aside(t) + out) + (line.used ? 0 : 3),
           "text-anchor": "middle", "font-size": line.used ? 11 : 9,
           fill: line.used ? "var(--fg)" : "var(--muted)" }));
         label(rtt, ms(line.rttMs));
         labels.push(rtt);
       }
     });
+    children.push(...drawnLines.reverse());
     tooltip(covering, descriptions.join("\n"));
   }
   // Above every line, so none crosses them.
-- 
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