doodads/character/character.js

// Playable Character
//
// If not controlled by the player, its AI is to move left and
// right and is able to pick up keys, press buttons and generally
// get up to mischief.
var playerSpeed = 4,
	direction = "right";

function main() {
	Self.SetMobile(true);    // Needed to activate most objects
	Self.SetInventory(true); // Can pick up keys and items (automatic)
	Self.SetGravity(true);   // Is pulled down by gravity
	Self.SetHitbox(0, 0, 32, 52);
	setupAnimations();

	// Are we the player character?
	if (Self.IsPlayer()) {
		return playerControls();
	}
	return ai()
}

function setupAnimations() {
	Self.AddAnimation("walk-left", 200, ["stand-left", "walk-left-1", "walk-left-2", "walk-left-3", "walk-left-2", "walk-left-1"]);
	Self.AddAnimation("walk-right", 200, ["stand-right", "walk-right-1", "walk-right-2", "walk-right-3", "walk-right-2", "walk-right-1"]);
}

// Player controls
function playerControls() {
	Events.OnKeypress(function (ev) {
		if (ev.Right) {
			if (!Self.IsAnimating()) {
				Self.PlayAnimation("walk-right", null);
			}
		} else if (ev.Left) {
			if (!Self.IsAnimating()) {
				Self.PlayAnimation("walk-left", null);
			}
		} else {
			Self.StopAnimation();
		}
	})
}

// AI controls. The AI is very simple:
//      walk to the right until you hit an obstacle,
//      then walk to the left until you hit an obstacle,
//      and repeat.
// It will automatically pickup keys and interact with things
// as it passes because it HasInventory and IsMobile.
function ai() {
	// 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 (sampleTick % sampleRate === 0) {
			var curX = Self.Position().X;
			var delta = Math.abs(curX - lastSampledX);
			if (delta < 5) {
				direction = direction === "right" ? "left" : "right";
			}
			lastSampledX = curX;
		}
		sampleTick++;

		var Vx = parseFloat(playerSpeed * (direction === "left" ? -1 : 1));
		Self.SetVelocity(Vector(Vx, 0.0));

		if (!Self.IsAnimating()) {
			Self.PlayAnimation("walk-" + direction, null);
		}
	}, 100);
}