From 974ca5cf0f2979e03543816aabd54a51f9b3a071 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Sat, 17 Dec 2022 12:13:23 +0100
Subject: cl draw example

---
 AoC2022/15/solver.lisp | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 AoC2022/15/solver.lisp

(limited to 'AoC2022/15/solver.lisp')

diff --git a/AoC2022/15/solver.lisp b/AoC2022/15/solver.lisp
new file mode 100644
index 0000000..3d4fafd
--- /dev/null
+++ b/AoC2022/15/solver.lisp
@@ -0,0 +1,53 @@
+(ql:quickload '(fiveam str cl-ppcre arrows uiop))
+
+
+(setf markers
+      (loop for line in (uiop:read-file-lines "eg-in")
+            for (sx sy bx by) = (multiple-value-bind (match values)
+                                    (cl-ppcre:scan-to-strings "Sensor at x=(-?\\d+), y=\(-?\\d+\): closest beacon is at x=(-?\\d+), y=(-?\\d+)"
+                                                              line)
+                                  (map 'list #'parse-integer values))
+            nconc (list (cons sx sy) (cons bx by))))
+
+(defun bounds (markers)
+  (list (list
+         (loop for (x . y) in markers minimize x)
+         (loop for (x . y) in markers maximize x))
+        (list
+         (loop for (x . y) in markers minimize y)
+         (loop for (x . y) in markers maximize y))))
+
+(defun grid (bounds)
+  (destructuring-bind ((xmin xmax) (ymin ymax)) bounds
+    (make-array (* (- xmax xmin -1) (- ymax ymin -1)) :initial-element 0 :element-type '(unsigned-byte 2))))
+
+(defun in-grid (bounds)
+  (destructuring-bind ((xmin xmax) (ymin ymax)) bounds
+    (let ((stride (- xmax xmin -1)))
+      (lambda (x y)
+        (when (and (<= xmin x xmax) (<= ymin y ymax))
+          (+ (- x xmin) (* (- y ymin) stride)))))))
+
+
+(defun draw-grid (grid stride)
+  (let ((out (make-string-output-stream)))
+    (loop for elt across grid
+          for idx from 0
+          do (progn (when (= 0 (mod idx stride)) (terpri out))
+                    (princ (case elt
+                             (0 ".")
+                             (1 "S")
+                             (2 "B")) out)))
+    (get-output-stream-string out)))
+
+(let* ((bounds (bounds markers))
+       (loc (in-grid bounds))
+       (grid (grid bounds)))
+  (loop for ((sx . sy) (bx . by)) on markers by #'cddr
+        do (progn (princ (list sx sy bx by))
+                  (setf (aref grid (funcall loc sx sy)) 1)
+                  (setf (aref grid (funcall loc bx by)) 2)))
+  (destructuring-bind ((xmin xmax) a) bounds
+    (princ (draw-grid grid (- xmax xmin -1)))
+    )
+  )
-- 
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