more scripting, objects moving

maps/start.toml

@@ -51,10 +51,37 @@ tile = "#"
 solid = false
 script_name = "greeter"
 
+# A solid object placed by x/y that paces east on its own. Demonstrates the
+# rate-limited move(), the blocked() collision check, the Queue object, and the
+# bump() hook (walk the player into it to trigger a bump).
+[[objects]]
+x = 10
+y = 12
+fg = "#33aa33"
+bg = "#000000"
+tile = 1
+script_name = "mover"
+
 [scripts]
 greeter = """
 fn init() {
     log(`hello from object — player at ${Board.player_x}, ${Board.player_y}`);
     set_tile(2);   // change my glyph to ☻ — proves the write path
 }
+"""
+
+mover = """
+// move() costs 250 ms, so the object steps ~4 cells/sec no matter how often
+// tick() runs. Queue.length() avoids piling up moves; blocked() avoids walking
+// into a wall (or another object's already-queued move this tick).
+fn tick(dt) {
+    if Queue.length() == 0 {
+        move(East);
+    }
+}
+// Fires when something steps into this object; id is the bumper's array index,
+// or -1 for the player.
+fn bump(id) {
+    log(`mover bumped by ${id}`);
+}
 """