New Doodad: Anvil

* The Anvil doodad is affected by gravity and becomes dangerous when
  falling. If it lands on the player character, you die! If it lands on
  any other mobile doodad, it destroys it! It can land on solid doodads
  such as the Electric Trapdoor and the Crumbly Floor. It will activate
  a Crumbly Floor if it lands on one, and can activate buttons and
  switches that it passes.
* JavaScript API: FailLevel(message) can be called from a doodad to kill
  the player character. The Anvil does this if it collides with the
  player while it's been falling.

dev-assets/doodads/box/box.js

@@ -41,9 +41,6 @@ function main() {
     // When we receive power, we reset to our original position.
     var origPoint = Self.Position();
     Message.Subscribe("power", function (powered) {
-        console.error("Box received power! %+v", powered);
-        console.error("MoveTo: %+v", origPoint);
-        console.error("Keys: %+v", Object.keys(Self));
         Self.MoveTo(origPoint);
         Self.SetVelocity(Vector(0, 0));
     });

dev-assets/doodads/build.sh

@@ -58,6 +58,10 @@ objects() {
 	cd box/
 	make
 	cd ..
+
+	cd crumbly-floor/
+	make
+	cd ..
 }
 
 onoff() {

dev-assets/doodads/objects/Makefile

@@ -2,10 +2,16 @@ ALL: build
 
 .PHONY: build
 build:
+	# Start Flag
+	doodad convert -t "Start Flag" start-flag.png start-flag.doodad
+
+	# Exit Flag
 	doodad convert -t "Exit Flag" exit-flag.png exit-flag.doodad
 	doodad install-script exit-flag.js exit-flag.doodad
 
-	doodad convert -t "Start Flag" start-flag.png start-flag.doodad
+	# Anvil
+	doodad convert -t "Anvil" anvil.png anvil.doodad
+	doodad install-script anvil.js anvil.doodad
 
 	for i in *.doodad; do\
 		doodad edit-doodad --tag "category=objects" $${i};\

dev-assets/doodads/objects/anvil.js

@@ -0,0 +1,51 @@
+// Anvil
+var falling = false;
+
+function main() {
+    // Note: doodad is not "solid" but hurts if it falls on you.
+    Self.SetHitbox(0, 0, 48, 25);
+    Self.SetMobile(true);
+    Self.SetGravity(true);
+
+    // Monitor our Y position to tell if we've been falling.
+    var lastPoint = Self.Position();
+    setInterval(function () {
+        var nowAt = Self.Position();
+        if (nowAt.Y > lastPoint.Y) {
+            falling = true;
+        } else {
+            falling = false;
+        }
+        lastPoint = nowAt;
+    }, 100);
+
+    Events.OnCollide(function (e) {
+        if (!e.Settled) {
+            return;
+        }
+
+        // Were we falling?
+        if (falling) {
+            if (e.InHitbox) {
+                if (e.Actor.IsPlayer()) {
+                    // Fatal to the player.
+                    Sound.Play("crumbly-break.wav");
+                    FailLevel("Watch out for anvils!");
+                    return;
+                }
+                else if (e.Actor.IsMobile()) {
+                    // Destroy mobile doodads.
+                    Sound.Play("crumbly-break.wav");
+                    e.Actor.Destroy();
+                }
+            }
+        }
+    });
+
+    // When we receive power, we reset to our original position.
+    var origPoint = Self.Position();
+    Message.Subscribe("power", function (powered) {
+        Self.MoveTo(origPoint);
+        Self.SetVelocity(Vector(0, 0));
+    });
+}

dev-assets/doodads/switches/switch.js

@@ -13,7 +13,7 @@ function main() {
 	});
 
 	Events.OnCollide(function (e) {
-		if (!e.Settled) {
+		if (!e.Settled || !e.Actor.IsMobile()) {
 			return;
 		}
 

dev-assets/doodads/trapdoors/electric-trapdoor.js

@@ -49,6 +49,11 @@ function setPoweredState(powered) {
         Self.PlayAnimation("open", function () {
             isOpen = true;
             animating = false;
+
+            // Had we lost power quickly?
+            if (!powerState) {
+                setPoweredState(false);
+            }
         });
     } else {
         animating = true;