Mobile Enemy Doodad Test

* Add a Red Azulian as a test for mobile enemies.
  * Its A.I. has it walk back and forth, changing directions when it
    comes up against an obstacle for a few moments.
  * It plays walking animations and can trigger collision events with
    other Doodads, such as the Electric Door and Trapdoor.
* Move Gravity responsibility to the doodad scripts themselves.
  * Call `Self.SetGravity(true)` to opt the Doodad in to gravity.
  * The canvas.Loop() adds gravity to any doodad that has it enabled.

dev-assets/doodads/azulian/azulian-red.js

@@ -0,0 +1,45 @@
+function main() {
+	log.Info("Azulian '%s' initialized!", Self.Doodad.Title);
+
+	var playerSpeed = 4;
+	var gravity = 4;
+	var Vx = Vy = 0;
+
+	var direction = "right";
+
+	Self.SetGravity(true);
+	Self.AddAnimation("walk-left", 100, ["red-wl1", "red-wl2", "red-wl3", "red-wl4"]);
+	Self.AddAnimation("walk-right", 100, ["red-wr1", "red-wr2", "red-wr3", "red-wr4"]);
+
+	// var nextTurn = time.Add(time.Now(), 2500);
+
+	// Sample our X position every few frames and detect if we've hit a solid wall.
+	var sampleTick = 0;
+	var sampleRate = 5;
+	var lastSampledX = 0;
+
+	setInterval(function() {
+		// if (time.Now().After(nextTurn)) {
+		// 	direction = direction === "right" ? "left" : "right";
+		// 	nextTurn = time.Add(time.Now(), 2500);
+		// }
+
+		if (sampleTick % sampleRate === 0) {
+			var curX = Self.Position().X;
+			var delta = Math.abs(curX - lastSampledX);
+			if (delta < 5) {
+				log.Error("flip red azulian");
+				direction = direction === "right" ? "left" : "right";
+			}
+			lastSampledX = curX;
+		}
+		sampleTick++;
+
+		var Vx = playerSpeed * (direction === "left" ? -1 : 1);
+		Self.SetVelocity(Point(Vx, 0));
+
+		if (!Self.IsAnimating()) {
+			Self.PlayAnimation("walk-"+direction, null);
+		}
+	}, 100);
+}

dev-assets/doodads/azulian/azulian.js

@@ -9,44 +9,29 @@ function main() {
 	var animStart = animEnd = 0;
 	var animFrame = animStart;
 
-	setInterval(function() {
-		if (animating) {
-			if (animFrame < animStart || animFrame > animEnd) {
-				animFrame = animStart;
-			}
-
-			animFrame++;
-			if (animFrame === animEnd) {
-				animFrame = animStart;
-			}
-			Self.ShowLayer(animFrame);
-		} else {
-			Self.ShowLayer(animStart);
-		}
-	}, 100);
+	Self.SetGravity(true);
+	Self.AddAnimation("walk-left", 100, ["blu-wl1", "blu-wl2", "blu-wl3", "blu-wl4"]);
+	Self.AddAnimation("walk-right", 100, ["blu-wr1", "blu-wr2", "blu-wr3", "blu-wr4"]);
 
 	Events.OnKeypress(function(ev) {
 		Vx = 0;
 		Vy = 0;
 
 		if (ev.Right.Now) {
-			animStart = 2;
-			animEnd = animStart+4;
-			animating = true;
+			if (!Self.IsAnimating()) {
+				Self.PlayAnimation("walk-right", null);
+			}
 			Vx = playerSpeed;
 		} else if (ev.Left.Now) {
-			animStart = 6;
-			animEnd = animStart+4;
-			animating = true;
+			if (!Self.IsAnimating()) {
+				Self.PlayAnimation("walk-left", null);
+			}
 			Vx = -playerSpeed;
 		} else {
+			Self.StopAnimation();
 			animating = false;
 		}
 
-		if (!Self.Grounded()) {
-			Vy += gravity;
-		}
-
 		// Self.SetVelocity(Point(Vx, Vy));
 	})
 }