1 files changed, 13 insertions, 2 deletions
diff --git a/src/2022/day15/aoc.h b/src/2022/day15/aoc.h
index ffb4183..eaed197 100644
--- a/src/2022/day15/aoc.h
+++ b/src/2022/day15/aoc.h
@@ -19,8 +19,9 @@ struct sensor {
     }
   };
 
-  struct triangle {
-    pos as[3];
+  struct line {
+    pos p0;
+    pos p1;
   };
 
   static int minx;
@@ -57,6 +58,16 @@ struct sensor {
     return d2 <= d1 && !(p == ps[1]);
   }
 
+  line line_by_dy(int dy) {
+    int d = mdistance(ps[0], ps[1]);
+    int y = ps[0].y + dy; 
+    int dx = d - std::abs(dy);
+    int x = ps[0].x - dx;
+    pos p0 = {x, y};
+    pos p1 = {x + 2 * dx, y};
+    return {p0 , p1};
+  }
+
   sensor(line_view lv) {
     const char* p = lv.line;
     int *is[] = {&ps[0].x, &ps[0].y, &ps[1].x, &ps[1].y};