From c2924723499859f9065fbfa6825748d5ad9bf219 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Mon, 10 Jun 2024 06:38:54 +0200
Subject: [PATCH] fix untractable alignments (e.g. in the rhombic projection)

closes https://github.com/d3/d3-geo-polygon/issues/39
---
 src/clip/polygon.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/clip/polygon.js b/src/clip/polygon.js
index 20c3b27..d3eb352 100644
--- a/src/clip/polygon.js
+++ b/src/clip/polygon.js
@@ -160,7 +160,7 @@ function clipLine(segments, pointVisible) {
       point: (lambda, phi, close) => {
         if (cos(lambda) == -1) lambda -= sign(sin(lambda)) * 1e-5; // move away from -180/180 https://github.com/d3/d3-geo/pull/108#issuecomment-323798937
         if (close) (lambda = lambda00), (phi = phi00);
-        let point = cartesian([lambda, phi]);
+        let point = cartesian([lambda * 0.9999999999, phi + 1e-14]);
         let v = v0;
         if (point0) {
           const intersections = [];