From 2d2c43aeb56510d4c8a34300d29f75ae88c82c3a Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Mon, 27 Jun 2016 07:42:38 +0200
Subject: [PATCH] Support bearing in path overlays

---
 src/serve_rendered.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index ea24373..278d345 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -353,7 +353,14 @@ module.exports = function(options, repo, params, id) {
     var ctx = canvas.getContext('2d');
     var center = precisePx([x, y], z);
     ctx.scale(scale, scale);
-    ctx.translate(-center[0] + w / 2, -center[1] + h / 2);
+    if (bearing) {
+      ctx.translate(w / 2, h / 2);
+      ctx.rotate(-bearing / 180 * Math.PI);
+      ctx.translate(-center[0], -center[1]);
+    } else {
+      // optimized path
+      ctx.translate(-center[0] + w / 2, -center[1] + h / 2);
+    }
     var lineWidth = query.width !== undefined ?
                     parseFloat(query.width) : 1;
     ctx.lineWidth = lineWidth;