more imap examples

data/scenarios/00-ORDER.txt

@@ -8,3 +8,4 @@ Speedruns
 Testing
 Vignettes
 Mechanics
+World Examples

data/scenarios/World Examples/00-ORDER.txt

@@ -0,0 +1,3 @@
+clearing.yaml
+rorschach.yaml
+stretch.yaml

data/scenarios/World Examples/clearing.yaml

@@ -0,0 +1,22 @@
+version: 1
+name: Clearing
+description: |
+  The base is in a clearing in the forest: the area within a certain
+  radius of the base is completely clear of trees; then there are
+  random trees at increasing density up to another radius; outside of
+  the outer radius there are only trees.
+creative: true
+robots:
+  - name: base
+    display:
+      char: Ω
+    loc: [0, 0]
+    dir: north
+world:
+  dsl: |
+    overlay
+    [ {dirt}
+    , mask ((x*x + 4*y*y) >= (6*6) && (x*x + 4*y*y) <= (30*30))
+        (let h = hash % 24 in if (36 + h*h) <= (x*x + 4*y*y) then {tree,dirt} else {dirt} )
+    , mask ((x*x + 4*y*y) > (30*30)) {tree, dirt}
+    ]

data/scenarios/World Examples/rorschach.yaml

@@ -0,0 +1,21 @@
+version: 1
+name: Rorschach
+description: |
+  A world with both horizontal and vertical reflection symmetry,
+  created with 'imap'.
+creative: true
+robots:
+  - name: base
+    dir: north
+    loc: [0, 0]
+known: [tree]
+world:
+  dsl: |
+    let trees = if (hash % 4 == 0) then {tree, dirt} else {stone}
+    in
+      overlay
+      [ mask (x >= 0 && y >= 0) trees
+      , mask (x >= 0 && y < 0) (imap x (-y) trees)
+      , mask (x < 0 && y >= 0) (imap (-x) y trees)
+      , mask (x < 0 && y < 0) (imap (-x) (-y) trees)
+      ]

data/scenarios/World Examples/stretch.yaml

@@ -0,0 +1,16 @@
+version: 1
+name: Stretch
+description: |
+  A world created by stretching a random pattern of trees, with the
+  amount of stretching determined by the distance from the origin.
+creative: true
+robots:
+  - name: base
+    dir: north
+    loc: [0, 0]
+known: [tree]
+world:
+  dsl: |
+    let trees = if (hash % 4 == 0) then {tree, dirt} else {stone}
+    in
+      imap (if (y == 0) then 0 else (x/abs(y))) (if (abs x <= 1) then 0 else (y/abs(x/2))) trees