From 7e79661ce0edf5408c42444f973b22bd9000cb60 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 25 Mar 2023 00:36:20 +0100
Subject: [PATCH] dual linepattern now accepts parameter

---
 config.cpp   |  3 +++
 pattern2.cpp | 11 ++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/config.cpp b/config.cpp
index 88ca4ef4..27195b59 100644
--- a/config.cpp
+++ b/config.cpp
@@ -2705,6 +2705,9 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
   param_f(linepatterns::meridian_prec, "meridian_prec");
   param_f(linepatterns::meridian_prec2, "meridian_prec2");
 
+  param_f(linepatterns::dual_length, "dual_length");
+  param_f(linepatterns::dual_angle, "dual_angle");
+
   param_f(twopoint_xscale, "twopoint_xscale");
   param_i(twopoint_xshape, "twopoint_xshape");
   param_f(twopoint_xwidth, "twopoint_xwidth");
diff --git a/pattern2.cpp b/pattern2.cpp
index 7be0b63c..e4aec2c7 100644
--- a/pattern2.cpp
+++ b/pattern2.cpp
@@ -2675,6 +2675,15 @@ EX namespace linepatterns {
     return c2 > c;
     }
 
+  EX ld dual_length = 0;
+  EX ld dual_angle = 0;
+
+  hyperpoint dualpoint() {
+    if(dual_length)
+      return xspinpush0(dual_angle * degree, dual_length);
+    return tile_center();
+    }
+
   linepattern patDual("dual grid", 0xFFFFFF00, always_available,
     ALLCELLS(
       forCellIdEx(c2, i, c) if(way(c,i)) {
@@ -2687,7 +2696,7 @@ EX namespace linepatterns {
         if((patTriRings.color & 0xFF)) {
           if(curr_dist(c2) == curr_dist(c)) continue;
           }
-        gridlinef(V, C0, V * currentmap->adj(c, i), C0, col, 2 + vid.linequality);
+        gridlinef(V, dualpoint(), V * currentmap->adj(c, i), dualpoint(), col, 2 + vid.linequality);
         }
       )
     );