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How to Create a Simple Lucky Draw Spinning Wheel in website? |
styles
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
<head>
<style type="text/css">
#wheelOfFortune {
display: inline-block;
position: relative;
overflow: hidden;
}
#wheel {
display: block;
}
#spin {
font: 1.5em/0 sans-serif;
user-select: none;
cursor: pointer;
display: flex;
justify-content: center;
align-items: center;
position: absolute;
top: 50%;
left: 50%;
width: 30%;
height: 30%;
margin: -15%;
background: #fff;
color: #fff;
box-shadow: 0 0 0 8px currentColor, 0 0px 15px 5px rgba(0, 0, 0, 0.6);
border-radius: 50%;
transition: 0.8s;
}
#spin::after {
content: "";
position: absolute;
top: -17px;
border: 10px solid transparent;
border-bottom-color: currentColor;
border-top: none;
}
</style>
Html
<div id="wheelOfFortune">
<canvas id="wheel" width="300" height="300"></canvas>
<div id="spin">SPIN</div>
</div>
Script
<script type="text/javascript">
const sectors = [
{color:"#f82", label:"Stack"},
{color:"#0bf", label:"10"},
{color:"#fb0", label:"200"},
{color:"#0fb", label:"50"},
{color:"#b0f", label:"100"},
{color:"#f0b", label:"5"},
];
const rand = (m, M) => Math.random() * (M - m) + m;
const tot = sectors.length;
const EL_spin = document.querySelector("#spin");
const ctx = document.querySelector("#wheel").getContext('2d');
const dia = ctx.canvas.width;
const rad = dia / 2;
const PI = Math.PI;
const TAU = 2 * PI;
const arc = TAU / sectors.length;
const friction = 0.991; // 0.995=soft, 0.99=mid, 0.98=hard
let angVel = 0; // Angular velocity
let ang = 0; // Angle in radians
const getIndex = () => Math.floor(tot - ang / TAU * tot) % tot;
function drawSector(sector, i) {
const ang = arc * i;
ctx.save();
// COLOR
ctx.beginPath();
ctx.fillStyle = sector.color;
ctx.moveTo(rad, rad);
ctx.arc(rad, rad, rad, ang, ang + arc);
ctx.lineTo(rad, rad);
ctx.fill();
// TEXT
ctx.translate(rad, rad);
ctx.rotate(ang + arc / 2);
ctx.textAlign = "right";
ctx.fillStyle = "#fff";
ctx.font = "bold 30px sans-serif";
ctx.fillText(sector.label, rad - 10, 10);
//
ctx.restore();
};
function rotate() {
const sector = sectors[getIndex()];
ctx.canvas.style.transform = `rotate(${ang - PI / 2}rad)`;
EL_spin.textContent = !angVel ? "SPIN" : sector.label;
EL_spin.style.background = sector.color;
}
function finishedSpinning() { // Called when the wheel stops spinning
const sector = sectors[getIndex()];
// alert('----------'+sector.label);
// alert("You have won " + sector.label);
swal(
"Congratulations",
"You Won The " + sector.label + ".",
"success"
);
}
function frame() {
if (!angVel) return;
const isSpinning = angVel > 0; // Check if the wheel is currently spinning
angVel *= friction; // Decrement velocity by friction
if (angVel < 0.002) angVel = 0; // Bring to stop
ang += angVel; // Update angle
ang %= TAU; // Normalize angle
rotate();
if (isSpinning && angVel === 0) { // If the wheel was spinning, but isn't anymore, it has just stopped
finishedSpinning();
}
}
function engine() {
frame();
requestAnimationFrame(engine)
}
// INIT
sectors.forEach(drawSector);
rotate(); // Initial rotation
engine(); // Start engine
EL_spin.addEventListener("click", () => {
if (!angVel) angVel = rand(0.25, 0.35);
});
</script>