98 lines
2.3 KiB
JavaScript
98 lines
2.3 KiB
JavaScript
// Link: computer-controlled. Milestones 4-5-8 slice:
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// seek -> walk to the nearest pot
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// throw -> pick it up and hurl it (pots.js handles the arc + shatter)
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// leave -> no pots left: walk to the exit gap and off-screen (ends the round)
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// Distractions (grass/chickens) arrive in a later milestone.
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import { TILE, LINK_SPEED } from "../config.js";
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import { visual } from "../sprites.js";
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import { throwPot } from "../pots.js";
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const INTERACT_DIST = TILE * 0.8;
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export function addLink(k, world, onLeave) {
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const p = world.tc(world.level.linkSpawn);
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const link = k.add([
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...visual(k, "link"),
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k.pos(p),
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k.area(),
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k.body(),
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k.state("seek", ["seek", "throw", "leave"]),
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"link",
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]);
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// Move toward a world position; returns distance remaining.
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const stepToward = (target) => {
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const d = target.sub(link.pos);
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const dist = d.len();
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if (dist > 1) link.move(d.unit().scale(LINK_SPEED));
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return dist;
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};
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const nearestPot = () => {
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const pots = k.get("pot");
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let best = null;
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let bestD = Infinity;
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for (const pot of pots) {
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const d = pot.pos.dist(link.pos);
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if (d < bestD) {
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bestD = d;
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best = pot;
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}
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}
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return best;
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};
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// --- SEEK ---
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link.onStateUpdate("seek", () => {
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const pot = nearestPot();
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if (!pot) {
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link.enterState("leave");
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return;
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}
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if (stepToward(pot.pos) <= INTERACT_DIST) {
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link.target = pot;
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link.enterState("throw");
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}
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});
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// --- THROW ---
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link.onStateEnter("throw", () => {
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const pot = link.target;
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if (!pot || pot.destroyed) {
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link.enterState("seek");
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return;
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}
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const at = pot.pos.clone();
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pot.destroy(); // picked up
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link.throwing = true;
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throwPot(k, world, at, () => {
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link.throwing = false;
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link.enterState("seek");
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});
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});
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// Stand still while the throw animation plays.
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// --- LEAVE ---
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link.onStateEnter("leave", () => {
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link.leaving = true;
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});
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link.onStateUpdate("leave", () => {
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const exitPos = world.tc(world.level.exit);
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stepToward(exitPos);
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// Once he reaches / passes the exit gap, he's gone.
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if (link.pos.dist(exitPos) < TILE * 0.5) {
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if (!link.gone) {
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link.gone = true;
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onLeave && onLeave();
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}
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}
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});
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link.onUpdate(() => {
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link.z = link.pos.y;
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});
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return link;
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}
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