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script.js
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script.js
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const prizes = [
{
text: "10% Off Sticker Price",
color: "hsl(197 30% 43%)",
reaction: "dancing"
},
{
text: "Free Car",
color: "hsl(173 58% 39%)",
reaction: "resting"
},
{
text: "No Money Down",
color: "hsl(43 74% 66%)",
reaction: "shocked"
},
{
text: "Half Off Sticker Price",
color: "hsl(27 87% 67%)",
reaction: "resting"
},
{
text: "Free DIY Carwash",
color: "hsl(12 76% 61%)",
reaction: "dancing"
},
{
text: "Eternal Damnation",
color: "hsl(350 60% 52%)",
reaction: "laughing"
},
{
text: "Used Travel Mug",
color: "hsl(91 43% 54%)",
reaction: "laughing"
},
{
text: "One Solid Hug",
color: "hsl(140 36% 74%)",
reaction: "dancing"
},
{
text: "10% Off Sticker Price",
color: "hsl(197 30% 43%)",
reaction: "dancing"
},
{
text: "Free Car",
color: "hsl(173 58% 39%)",
reaction: "shocked"
},
{
text: "No Money Down",
color: "hsl(43 74% 66%)",
reaction: "resting"
},
{
text: "Half Off Sticker Price",
color: "hsl(27 87% 67%)",
reaction: "shocked"
},
{
text: "Free DIY Carwash",
color: "hsl(12 76% 61%)",
reaction: "dancing"
},
{
text: "Eternal Damnation",
color: "hsl(350 60% 52%)",
reaction: "laughing"
},
{
text: "Used Travel Mug",
color: "hsl(91 43% 54%)",
reaction: "laughing"
},
{
text: "One Solid Hug",
color: "hsl(140 36% 74%)",
reaction: "dancing"
}
];
const wheel = document.querySelector(".deal-wheel");
const spinner = wheel.querySelector(".spinner");
const trigger = wheel.querySelector(".btn-spin");
const ticker = wheel.querySelector(".ticker");
const reaper = wheel.querySelector(".grim-reaper");
const prizeSlice = 360 / prizes.length;
const prizeOffset = Math.floor(180 / prizes.length);
const spinClass = "is-spinning";
const selectedClass = "selected";
const spinnerStyles = window.getComputedStyle(spinner);
let tickerAnim;
let rotation = 0;
let currentSlice = 0;
let prizeNodes;
const createPrizeNodes = () => {
prizes.forEach(({ text, color, reaction }, i) => {
const rotation = ((prizeSlice * i) * -1) - prizeOffset;
spinner.insertAdjacentHTML(
"beforeend",
`<li class="prize" data-reaction=${reaction} style="--rotate: ${rotation}deg">
<span class="text">${text}</span>
</li>`
);
});
};
const createConicGradient = () => {
spinner.setAttribute(
"style",
`background: conic-gradient(
from -90deg,
${prizes
.map(({ color }, i) => `${color} 0 ${(100 / prizes.length) * (prizes.length - i)}%`)
.reverse()
}
);`
);
};
const setupWheel = () => {
createConicGradient();
createPrizeNodes();
prizeNodes = wheel.querySelectorAll(".prize");
};
const spinertia = (min, max) => {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min + 1)) + min;
};
const runTickerAnimation = () => {
// https://css-tricks.com/get-value-of-css-rotation-through-javascript/
const values = spinnerStyles.transform.split("(")[1].split(")")[0].split(",");
const a = values[0];
const b = values[1];
let rad = Math.atan2(b, a);
if (rad < 0) rad += (2 * Math.PI);
const angle = Math.round(rad * (180 / Math.PI));
const slice = Math.floor(angle / prizeSlice);
if (currentSlice !== slice) {
ticker.style.animation = "none";
setTimeout(() => ticker.style.animation = null, 10);
currentSlice = slice;
}
tickerAnim = requestAnimationFrame(runTickerAnimation);
};
const selectPrize = () => {
const selected = Math.floor(rotation / prizeSlice);
prizeNodes[selected].classList.add(selectedClass);
reaper.dataset.reaction = prizeNodes[selected].dataset.reaction;
};
trigger.addEventListener("click", () => {
if (reaper.dataset.reaction !== "resting") {
reaper.dataset.reaction = "resting";
}
trigger.disabled = true;
rotation = Math.floor(Math.random() * 360 + spinertia(2000, 5000));
prizeNodes.forEach((prize) => prize.classList.remove(selectedClass));
wheel.classList.add(spinClass);
spinner.style.setProperty("--rotate", rotation);
ticker.style.animation = "none";
runTickerAnimation();
});
spinner.addEventListener("transitionend", () => {
cancelAnimationFrame(tickerAnim);
trigger.disabled = false;
trigger.focus();
rotation %= 360;
selectPrize();
wheel.classList.remove(spinClass);
spinner.style.setProperty("--rotate", rotation);
});
setupWheel();