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[codex] Add train dispatch milestone animation #121

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[codex] Add train dispatch milestone animation #121

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178 changes: 176 additions & 2 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,66 @@
pointer-events: none;
}

.milestone {
position: fixed;
inset: 0;
z-index: 8;
display: grid;
place-items: center;
padding: 24px;
pointer-events: none;
opacity: 0;
}

.milestone.show {
animation: milestone-stage 1900ms ease both;
}

.milestone-message {
position: relative;
display: grid;
place-items: center;
gap: 8px;
color: var(--ink);
text-align: center;
text-shadow: 0 1px 0 #fff;
transform-origin: center;
}

.milestone.show .milestone-message {
animation: milestone-pop 1900ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.milestone-number {
font-size: clamp(72px, 16vw, 150px);
font-weight: 850;
line-height: 0.9;
letter-spacing: 0;
}

.milestone-label {
font-size: clamp(18px, 4vw, 32px);
font-weight: 750;
letter-spacing: 0;
}

.milestone-train {
font-size: clamp(42px, 9vw, 88px);
line-height: 1;
}

.spark {
position: absolute;
top: 50%;
left: 50%;
width: 10px;
height: 18px;
border-radius: 2px;
background: var(--spark-color);
animation: spark-burst 1500ms cubic-bezier(0.16, 1, 0.3, 1) both;
animation-delay: var(--spark-delay);
}

@keyframes wiggle {
0%,
100% {
Expand Down Expand Up @@ -227,17 +287,79 @@
}
}

@keyframes milestone-stage {
0%,
100% {
opacity: 0;
}

12%,
82% {
opacity: 1;
}
}

@keyframes milestone-pop {
0% {
opacity: 0;
transform: translateY(22px) scale(0.72) rotate(-5deg);
}

18% {
opacity: 1;
transform: translateY(0) scale(1.08) rotate(2deg);
}

32%,
74% {
opacity: 1;
transform: translateY(0) scale(1) rotate(0);
}

100% {
opacity: 0;
transform: translateY(-18px) scale(0.92) rotate(3deg);
}
}

@keyframes spark-burst {
0% {
opacity: 0;
transform: translate(-50%, -50%) scale(0.3) rotate(0deg);
}

15% {
opacity: 1;
}

100% {
opacity: 0;
transform: translate(
calc(-50% + var(--spark-x)),
calc(-50% + var(--spark-y))
)
scale(1) rotate(var(--spark-rotation));
}
}

@media (prefers-reduced-motion: reduce) {
.hero,
.train-emoji:hover {
.train-emoji:hover,
.milestone.show,
.milestone.show .milestone-message {
animation: none;
transition: none;
}

.steam {
.steam,
.spark {
display: none;
}

.milestone.show {
opacity: 1;
}

.train.ltr,
.train.rtl {
left: 50%;
Expand Down Expand Up @@ -284,11 +406,13 @@
</button>

<div class="counter" id="counter" aria-live="polite">0 trains dispatched</div>
<div class="milestone" id="milestone" aria-live="polite" aria-atomic="true"></div>
</main>

<script>
const TRAIN_EMOJIS = ["🚂", "🚃", "🚅", "🚋", "🚄"];
const PUFF_CHARS = ["·", "°", "・", "∘"];
const SPARK_COLORS = ["#111111", "#ff5a5f", "#2ec4b6", "#ffca3a", "#6c63ff"];
const LANE_COUNT = 5;
const DISPATCH_THROTTLE_MS = 120;
const PUFF_COUNT = 4;
Expand All @@ -299,6 +423,7 @@
const hero = document.querySelector("#hero");
const muteButton = document.querySelector("#mute");
const counter = document.querySelector("#counter");
const milestone = document.querySelector("#milestone");
const choo = new Audio("./public/choo-choo.mp3");
choo.preload = "auto";

Expand All @@ -307,6 +432,7 @@
let lastDispatch = 0;
let lastLane = -1;
let lastDirection = "rtl";
let milestoneTimer = null;
let muted = localStorage.getItem("wtc:muted") === "1";

function pick(items) {
Expand Down Expand Up @@ -334,6 +460,53 @@
node.play().catch(() => {});
}

function createSpark(index, total) {
const spark = document.createElement("span");
const angle = (Math.PI * 2 * index) / total;
const distance = 120 + Math.random() * 150;

spark.className = "spark";
spark.style.setProperty("--spark-color", SPARK_COLORS[index % SPARK_COLORS.length]);
spark.style.setProperty("--spark-delay", `${Math.random() * 120}ms`);
spark.style.setProperty("--spark-x", `${Math.cos(angle) * distance}px`);
spark.style.setProperty("--spark-y", `${Math.sin(angle) * distance}px`);
spark.style.setProperty("--spark-rotation", `${180 + Math.random() * 360}deg`);

return spark;
}

function showMilestone(total) {
if (total % 10 !== 0) return;

const noun = total === 1 ? "train" : "trains";
const message = document.createElement("div");
message.className = "milestone-message";
message.innerHTML = `
<span class="milestone-train" aria-hidden="true">🚂✨</span>
<span class="milestone-number">${total}</span>
<span class="milestone-label">${noun} dispatched</span>
`;

milestone.replaceChildren(message);
for (let i = 0; i < 24; i += 1) {
milestone.append(createSpark(i, 24));
}

milestone.classList.remove("show");
void milestone.offsetWidth;
milestone.classList.add("show");

if (milestoneTimer) {
window.clearTimeout(milestoneTimer);
}

milestoneTimer = window.setTimeout(() => {
milestone.classList.remove("show");
milestone.replaceChildren();
milestoneTimer = null;
}, 2100);
}

function removeNode(event) {
event.currentTarget.remove();
}
Expand Down Expand Up @@ -390,6 +563,7 @@
count += 1;
hero.classList.add("dispatched");
updateCounter();
showMilestone(count);
playChoo();

for (let i = 0; i < PUFF_COUNT; i += 1) {
Expand Down