doodads/crusher/crusher.js

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JavaScript
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// Crusher
/*
A.I. Behaviors:
- Sleeps and hangs in the air in a high place.
- When a player gets nearby, it begins "peeking" in their direction.
- When the player is below, tries to drop and crush them or any
other mobile doodad.
- The top edge is safe to walk on and ride back up like an elevator.
*/
let direction = "left",
dropSpeed = 12,
riseSpeed = 4,
watchRadius = 300, // player nearby distance to start peeking
fallRadius = 120, // player distance before it drops
helmetThickness = 48, // safe solid hitbox height
fireThickness = 12, // dangerous bottom thickness
targetAltitude = Self.Position()
lastAltitude = targetAltitude.Y
size = Self.Size();
const states = {
idle: 0,
peeking: 1,
drop: 2,
falling: 3,
hit: 4,
rising: 5,
};
let state = states.idle;
function main() {
Self.SetMobile(true);
Self.SetGravity(false);
Self.SetInvulnerable(true);
Self.SetHitbox(5, 2, 90, 73);
Self.AddAnimation("hit", 50,
["angry", "ouch", "angry", "angry", "angry", "angry",
"sleep", "sleep", "sleep", "sleep", "sleep", "sleep",
"sleep", "sleep", "sleep", "sleep", "sleep", "sleep",
"sleep", "sleep", "sleep", "sleep", "sleep", "sleep"],
)
// Player Character controls?
if (Self.IsPlayer()) {
return player();
}
let hitbox = Self.Hitbox();
Events.OnCollide((e) => {
// The bottom is deadly if falling.
if (state === states.falling || state === states.hit && e.Settled) {
if (e.Actor.IsMobile() && e.InHitbox && !e.Actor.Invulnerable()) {
if (e.Overlap.H > 72) {
if (e.Actor.IsPlayer()) {
FailLevel("Don't get crushed!");
return;
} else {
e.Actor.Destroy();
}
}
}
}
// Our top edge is always solid.
if (e.Actor.IsPlayer() && e.InHitbox) {
if (e.Overlap.Y < helmetThickness) {
// Be sure to position them snug on top.
// TODO: this might be a nice general solution in the
// collision detector...
e.Actor.MoveTo(Point(
e.Actor.Position().X,
Self.Position().Y - e.Actor.Hitbox().Y - e.Actor.Hitbox().H,
))
e.Actor.SetGrounded(true);
}
}
// The whole hitbox is ordinarily solid.
if (state !== state.falling) {
if (e.Actor.IsMobile() && e.InHitbox) {
return false;
}
}
});
setInterval(() => {
// Find the player.
let player = Actors.FindPlayer(),
playerPoint = player.Position(),
point = Self.Position(),
delta = 0,
nearby = false,
below = false;
// Face the player.
if (playerPoint.X < point.X + (size.W / 2)) {
direction = "left";
delta = Math.abs(playerPoint.X - (point.X + (size.W/2)));
}
else if (playerPoint.X > point.X + (size.W / 2)) {
direction = "right";
delta = Math.abs(playerPoint.X - (point.X + (size.W/2)));
}
if (delta < watchRadius) {
nearby = true;
}
if (delta < fallRadius) {
// Check if the player is below us.
if (playerPoint.Y > point.Y + size.H) {
below = true;
}
}
switch (state) {
case states.idle:
if (nearby) {
Self.ShowLayerNamed("peek-"+direction);
} else {
Self.ShowLayerNamed("sleep");
}
if (below) {
state = states.drop;
} else if (nearby) {
state = states.peeking;
}
break;
case states.peeking:
if (nearby) {
Self.ShowLayerNamed("peek-"+direction);
} else {
state = states.idle;
break;
}
if (below) {
state = states.drop;
}
break;
case states.drop:
// Begin the fall.
Self.ShowLayerNamed("angry");
Self.SetVelocity(Vector(0.0, dropSpeed));
lastAltitude = -point.Y;
state = states.falling;
case states.falling:
Self.ShowLayerNamed("angry");
Self.SetVelocity(Vector(0.0, dropSpeed));
// Landed?
if (point.Y === lastAltitude) {
Sound.Play("crumbly-break.wav")
state = states.hit;
Self.PlayAnimation("hit", () => {
state = states.rising;
});
}
break;
case states.hit:
// A transitory state while the hit animation
// plays out.
break;
case states.rising:
Self.ShowLayerNamed("sleep");
Self.SetVelocity(Vector(0, -riseSpeed));
point = Self.Position();
if (point.Y <= targetAltitude.Y+4 || point.Y === lastAltitude.Y) {
Self.MoveTo(targetAltitude);
Self.SetVelocity(Vector(0, 0))
state = states.idle;
}
}
lastAltitude = point.Y;
}, 100);
}
// If under control of the player character.
function player() {
Events.OnKeypress((ev) => {
if (ev.Right) {
direction = "right";
} else if (ev.Left) {
direction = "left";
}
// Jump!
if (ev.Down) {
Self.ShowLayerNamed("angry");
return;
} else if (ev.Right && ev.Left) {
Self.ShowLayerNamed("ouch");
} else if (ev.Right || ev.Left) {
Self.ShowLayerNamed("peek-"+direction);
} else {
Self.ShowLayerNamed("sleep");
}
});
}