Modules reorganization

[dungeon-master.git] / modules / dungeon-master / generators / town.scm

diff --git a/modules/dungeon-master/generators/town.scm b/modules/dungeon-master/generators/town.scm
new file mode 100644 (file)
index 0000000..7e93636
--- /dev/null
+++ b/modules/dungeon-master/generators/town.scm
@@ -0,0 +1,63 @@
+;;; Dungeon Master --- RPG Adventure Generator
+;;; Copyright © 2019 Javier Sancho <jsf@jsancho.org>
+;;;
+;;; Dungeon Master is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; Dungeon Master is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Dungeon Master. If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (dungeon-master generators town)
+  #:use-module (dungeon-master geom voronoi)
+  #:use-module (dungeon-master geom point)
+  #:export (generate))
+
+(define (random-bool)
+  (= (random 2) 1))
+
+(define pi 3.141592654)
+(define relax-steps 3)
+
+(define (generate patches)
+  "City generator from https://github.com/watabou/TownGeneratorOS/blob/master/Source/com/watabou/towngenerator/building/Model.hx"
+  (set! *random-state* (random-state-from-platform))
+  (when (= patches -1) (set! patches 15))
+  (build-patches patches))
+
+(define (build-patches n-patches)
+  (define* (get-points n seed #:optional (l '()))
+    (cond ((>= n 0)
+           (let* ((a (+ seed (* (sqrt n) 5)))
+                  (r (if (= n 0)
+                         0
+                         (+ 10 (* n (+ 2 (random:exp))))))
+                  (point (make-point
+                          (* (cos a) r)
+                          (* (sin a) r))))
+             (get-points (- n 1) seed (cons point l))))
+          (else
+           l)))
+
+  (define (relax voronoi n step)
+    "Relaxing central wards"
+    (cond ((> step 0)
+           (let* ((voronoi-points (voronoi-mesh-points voronoi))
+                  (n-points (length voronoi-points))
+                  (to-relax (cons (list-ref voronoi-points (- n-points n-patches))
+                                  (list-tail voronoi-points (- n-points 3)))))
+             (relax (voronoi-mesh-relax voronoi to-relax) n (- step 1))))
+          (else
+           voronoi)))
+
+  (let* ((sa (* (random:exp) 2 pi))
+         (points (get-points (* 8 n-patches) sa))
+         (voronoi (relax (make-voronoi-mesh points) n-patches relax-steps)))
+    "end"))