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index.html
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<!DOCTYPE html>
<html lang="en" class="">
<head>
<meta charset="UTF-8" />
<title>抽奖</title>
<meta name="robots" content="noindex" />
<style class="INLINE_PEN_STYLESHEET_ID">
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
body {
min-height: 100vh;
display: flex;
flex-direction: column;
justify-content: flex-end;
align-items: center;
background: hsl(225, 60%, 15%);
background-image: url("star.webp");
background-size: cover;
}
.main-btn {
margin-top: 30px;
color: rgb(255, 255, 255);
background-color: rgb(255, 0, 0);
border-radius: 0px;
border-style: outset;
border-color: linen;
text-decoration: none;
border-width: 15px;
font-size: 50px;
padding: 10px 20px 10px 20px;
}
.main-btn:active {
background-color: rgb(253, 115, 115);
border-style: inset;
color: purple;
}
.main-btn:disabled {
background-color: lightslategrey;
}
#countt {
color: white;
position: absolute;
transform: translate(50%, 0);
right: 7%;
top: 100px;
font-size: 100px;
}
.info-board {
color: white;
position: absolute;
left: 100px;
font-size: 30px;
}
#world-event {
font-size: 20px;
left: 5%;
top: 5%;
}
#current-winner {
font-size: 60px;
left: 50%;
top: 20px;
transform: translate(-50%, 0);
}
#demo {
text-align: center;
position: absolute;
height: 100vh;
width: 100vw;
left: 0;
top: 0;
background-color: #00000099;
}
#demo2 {
position: absolute;
right: 7%;
transform: translate(50%, 0);
bottom: 10%;
}
</style>
</head>
<body>
<div id="demo">
<button id="button1" class="main-btn" onclick="work()" disabled>
开始抽奖
</button>
</div>
<div id="demo2">
<img src="reload.png" onclick="restore()" />
</div>
<div id="info">
<p id="countt" onclick="restore()"></p>
<div class="info-board" id="current-winner">
<img id="current-winner-avatar" />
<span id="current-winner-text"></span>
</div>
<div class="info-board" id="world-event"></div>
</div>
<script src="https://unpkg.com/matter-js@0.14.2/build/matter.min.js"></script>
<script id="INLINE_PEN_JS_ID">
var a = ["一等", "二等", "三等", "四等", "五等"];
const T = 30; //倒计时时间
let start; //初始时间
let userData = null;
let hitCache = {};
let totalPoints = 0;
let pointsList = [];
let userIdentifier = 0; // Primary key for avatar
const dropInterval = 150;
const urlParams = new URLSearchParams(window.location.search);
const prizeType = urlParams.get("prize");
document.getElementById("button1").innerHTML = `抽${a[prizeType]}奖`;
const apiPoint = urlParams.get("api");
const dataPromise = fetch(apiPoint)
.then((response) => response.json())
.then((data) => {
data.forEach((user) => {
const point = user.investment[prizeType] + 1;
totalPoints += point;
pointsList.push(point);
});
userData = data;
document.getElementsByClassName("main-btn")[0].disabled = false;
});
function jishi() {
//输出剩余时间
var now = new Date();
var time =
T -
(Math.floor(now.getTime() / 1000) -
Math.floor(start.getTime() / 1000));
document.getElementById("countt").innerHTML = time;
}
function work() {
document.getElementById("countt").innerHTML = T;
//每秒执行jishi()，T秒后停止
start = new Date();
//jishi();
var myVar = setInterval(function () {
jishi();
}, 1000);
var stop = setTimeout(function () {
clearInterval(myVar);
}, T * 1000);
document.getElementById("demo").style.display = "none";
document.getElementById("info").style.display = null;
const setid = setInterval(addPlinko, dropInterval);
setTimeout(function () {
clearInterval(setid);
}, T * 1000);
}
function restore() {
document.getElementById("demo").style.display = null;
document.getElementById("info").style.display = "none";
document.getElementById("current-winner-avatar").src = "";
document.getElementById("current-winner-text").innerText = "";
document.getElementById("world-event").innerText = "";
hitCache = {};
World.remove(
world,
world.bodies.filter((body) => body.label.includes("name"))
);
}
// global variables used throughout the canvas
const width = window.innerWidth * 0.7;
const height = window.innerHeight* 0.8;
// export the necessary modules
const { Engine, Render, World, Bodies, Events } = Matter;
// set up the engine
const engine = Engine.create();
// set up the renderer
const render = Render.create({
element: document.body,
engine,
// set a background slightly lighter than the body's own background
options: {
wireframes: false,
background: "#00000000",
height,
width,
},
});
// number of columns and rows for the grid of pegs
const columns = Math.floor(width / 50);
const rows = 7;
// margin to allocate buckets underneath the grid
const margin = 240;
// padding to include make space for two rectangles at either side of the canvas
const padding = width / columns / 2;
// number of initial and maximum plinkos included in the canvas
const initialPlinkos = 10;
const maxPlinkos = 250;
// utility function returning a random integer between two values
const randomBetween = (min, max) =>
Math.floor(Math.random() * (max - min)) + min;
const naiveSelect = () => {
let rand_point = Math.floor(Math.random() * totalPoints);
let accum_point = 0;
for (let i = 0; i < userData.length; i++) {
accum_point += pointsList[i];
if (accum_point > rand_point) return userData[i];
}
};
// function fabricating a plinko, as a circle included atop the canvas
const makePlinko = () => {
const x = randomBetween((width * 6) / 9, (width * 7) / 9);
const y = randomBetween(0, height / 2) * -1;
const r = Math.floor(Math.min(width, height) / 30);
const selectedUser = naiveSelect();
document.getElementById(
"world-event"
).innerText = `${selectedUser.name} 加入战场 `;
return Bodies.rectangle(x, y, r, r, {
restitution: 0.8,
render: {
sprite: {
xScale: r / 46,
yScale: r / 46,
texture: selectedUser.avatar,
},
},
// add a label to later identify the circle in the collision event
label: JSON.stringify({
name: selectedUser.name,
id: userIdentifier++,
}),
});
};
// function fabricating a peg, as a white circle with a static position
// accepting as input the coordinates of the circle's center
const makePeg = (x, y) => {
const r = 5;
return Bodies.circle(x, y, r, {
isStatic: true,
render: {
fillStyle: "white",
},
// add a label to later identify the circle in the collision event
label: "peg",
});
};
// function fabricating a bucket, as a white taller-than-wider rectangle positioned at the bottom of the canvas
const makeBucket = (x) => {
const w = 5;
const h = 200;
const y = height - h / 2;
return Bodies.rectangle(x, y, w, h, {
isStatic: true,
render: {
fillStyle: "white",
},
});
};
// PLINKO's elements
// to prevent the plinkos from bouncing off the canvas's scope, include rectangle elements at the bottom and sides of the element
const contourSize = 50;
const contourBottom = Bodies.rectangle(
width / 2,
height + contourSize / 2,
width,
contourSize,
{
isStatic: true,
label: "bottom",
}
);
// use the padding to create the left and right walls as white tall and thin rectangles
// the idea is to have them pick up the color of the plinkos coming into contact with the shape
const contourLeft = Bodies.rectangle(0, 0, padding / 2, height * 2, {
isStatic: true,
render: {
fillStyle: "white",
},
});
const contourRight = Bodies.rectangle(width, 0, padding / 2, height * 2, {
isStatic: true,
render: {
fillStyle: "white",
},
});
const contours = [contourBottom, contourLeft, contourRight];
// pegs
// array of columns and rows; the idea is to have pegs ranging the width and height of the canvas
// use the padding to reduce the horizontal space allocated to the pegs
const columnSize = (width - padding * 2) / columns;
const rowSize = (height - margin) / rows;
const grid = Array(rows)
.fill()
.map((rowItem, row) => {
// have the number of columns alternate with a shorter row every other row
// the idea is to then offset the shorter row to recreate the plinko's own structure
const cols = row % 2 === 0 ? columns : columns - 1;
const dx = cols !== columns ? columnSize / 2 : 0;
return Array(cols)
.fill()
.map((columnItem, column) => {
const x = padding + columnSize * column + columnSize / 2 + dx;
const y = rowSize * row + rowSize / 2;
return makePeg(x, y);
});
});
// since grid refers to a 2d array, flatten the items to a one-dimensional array
const pegs = grid.reduce((acc, curr) => [...acc, ...curr], []);
// buckets
// arrays of buckets in which the plinkos would eventually fall
// as many buckets as the number of columns -1, to make use of the left and right wall for the outer edges
const buckets = Array(columns)
.fill()
.map((columnItem, column) => {
const x = columnSize * column + columnSize;
return makeBucket(x);
});
const { world } = engine;
World.add(world, [...contours, ...pegs, ...buckets]);
// function adding a single plinko, used following a mouse press and at an interval
function addPlinko() {
const plinko = makePlinko();
World.add(world, plinko);
}
function handleHit(body) {
const column = Math.floor(body.position.x / columnSize);
if (typeof hitCache[body.label] === "undefined") {
console.log(body.label, "hit", column);
const { name } = JSON.parse(body.label);
if (!Object.values(hitCache).includes(column)) {
/*document.getElementById(
"world-event"
).innerText = `${name} 率先到达 ${column} 号位置！`;*/
}
if (column < Math.min(...Object.values(hitCache))) {
document.getElementById(
"current-winner-text"
).innerText = `当前领先：${name}`;
document.getElementById("current-winner-avatar").src =
body.render.sprite.texture;
}
hitCache[body.label] = column;
}
}
// following a collision event retrieve the label of the two bodies
// if one is a plinko, consider its color and apply it to the other body
function handleCollision(event) {
const { pairs } = event;
pairs.forEach((pair) => {
const { bodyA, bodyB } = pair;
const { label: labelA } = bodyA;
const { label: labelB } = bodyB;
if (labelA !== labelB) {
if (labelA === "bottom") handleHit(bodyB);
if (labelB === "bottom") handleHit(bodyA);
}
});
}
Events.on(engine, "collisionStart", handleCollision);
// run the engine
Engine.run(engine);
// run the renderer
Render.run(render);
</script>
</body>
</html>