Mostly implement rover

js/tileset.js

@@ -344,8 +344,26 @@ export const CC2_TILESET_LAYOUT = {
         west: [[14, 17], [15, 17]],
     },
 
-    // TODO rover has layers and moves and stuff
+    // TODO rover has an overlay showing its direction
-    rover: [0, 18],
+    rover: {
+        inert: [0, 18],
+        teeth: [[0, 18], [8, 18]],
+        glider: [
+            // quite fast
+            [0, 18], [1, 18], [2, 18], [3, 18], [4, 18], [5, 18], [6, 18], [7, 18],
+            [0, 18], [1, 18], [2, 18], [3, 18], [4, 18], [5, 18], [6, 18], [7, 18],
+        ],
+        bug: [[0, 18], [1, 18], [2, 18], [3, 18], [4, 18], [5, 18], [6, 18], [7, 18]],
+        ball: [[0, 18], [4, 18]],
+        teeth_timid: [[0, 18], [9, 18]],
+        fireball: [
+            // quite fast
+            [7, 18], [6, 18], [5, 18], [4, 18], [3, 18], [2, 18], [1, 18], [0, 18],
+            [7, 18], [6, 18], [5, 18], [4, 18], [3, 18], [2, 18], [1, 18], [0, 18],
+        ],
+        paramecium: [[7, 18], [6, 18], [5, 18], [4, 18], [3, 18], [2, 18], [1, 18], [0, 18]],
+        walker: [[8, 18], [9, 18]],
+    },
     xray_eye: [11, 18],
     ghost: {
         north: [12, 18],

js/tiletypes.js

@@ -1733,6 +1733,32 @@ const TILE_TYPES = {
         blocks_collision: COLLISION.all_but_player,
         can_reveal_walls: true,
         movement_speed: 4,
+        on_ready(me, level) {
+            me.current_emulatee = 0;
+            me.attempted_moves = 0;
+        },
+        _emulatees: ['teeth', 'glider', 'bug', 'ball', 'teeth_timid', 'fireball', 'paramecium', 'walker'],
+        decide_movement(me, level) {
+            if (me.attempted_moves >= 32) {
+                level._set_tile_prop(me, 'attempted_moves', me.attempted_moves - 32);
+                level._set_tile_prop(me, 'current_emulatee', (me.current_emulatee + 1) % me.type._emulatees.length);
+            }
+
+            me.attempted_moves += 1;
+            let emulatee = me.type._emulatees[me.current_emulatee];
+            let preference = TILE_TYPES[emulatee].decide_movement(me, level);
+            // TODO need to rig this so a failure counts as two moves
+            // TODO obeys step while emulating teeth (gah, i guess move that in here too)
+            return preference;
+        },
+        visual_state(me) {
+            if (me && me.current_emulatee !== undefined) {
+                return me.type._emulatees[me.current_emulatee];
+            }
+            else {
+                return 'inert';
+            }
+        },
     },
 
     // Keys, whose behavior varies