@igor-j86/snowflakes
Version:
Snowflakes component
72 lines (71 loc) • 3.28 kB
JavaScript
import * as React from "react";
export var Snowflakes = function (_a) {
var _b = _a.id, id = _b === void 0 ? "snowflakes" : _b, _c = _a.snowflakes, snowflakes = _c === void 0 ? 100 : _c, _d = _a.maxSize, maxSize = _d === void 0 ? 3 : _d, _e = _a.maxSpeed, maxSpeed = _e === void 0 ? 0.5 : _e, _f = _a.color, color = _f === void 0 ? '#dddddd' : _f;
var canv = React.useRef(null);
React.useEffect(function () {
if (canv.current) {
var NUMBER_OF_FLAKES = snowflakes;
var MAX_FLAKES_SIZE_1 = maxSize;
var MAX_FLAKES_BLUR_1 = 2;
var MAX_FLAKES_SPEED_1 = maxSpeed;
var FLAKES_COLOR_1 = color;
var flakes_1 = [];
canv.current.style.position = 'fixed';
canv.current.style.top = '0';
canv.current.style.left = '0';
canv.current.style.pointerEvents = 'none';
canv.current.width = window.innerWidth;
canv.current.height = window.innerHeight;
var ctx_1 = canv.current.getContext('2d');
var createFlake_1 = function () { return canv.current && ({
x: Math.random() * canv.current.width,
y: Math.random() * canv.current.height - canv.current.height,
radius: Math.random() * MAX_FLAKES_SIZE_1 + 3,
transparency: Math.random(),
blur: Math.random() * MAX_FLAKES_BLUR_1,
color: FLAKES_COLOR_1,
speed: Math.random() * MAX_FLAKES_SPEED_1 + 1,
sway: Math.random() - 0.5
}); };
var drawFlakes_1 = function (flake) {
if (ctx_1) {
ctx_1.beginPath();
ctx_1.arc(flake.x, flake.y, flake.radius, 0, Math.PI * 2);
ctx_1.fillStyle = flake.color;
ctx_1.filter = "blur(".concat(flake.blur, "px)");
ctx_1.globalAlpha = flake.transparency;
ctx_1.fill();
ctx_1.closePath();
}
};
var updateFlakes_1 = function (flake) {
flake.y += flake.speed;
flake.x += flake.sway;
if (canv.current && flake.y > canv.current.height) {
Object.assign(flake, createFlake_1());
}
};
var animate_1 = function () {
if (ctx_1 && canv.current) {
ctx_1.clearRect(0, 0, canv.current.width, canv.current.height);
flakes_1.forEach(function (flake) {
updateFlakes_1(flake);
drawFlakes_1(flake);
});
requestAnimationFrame(animate_1);
}
};
for (var i = 0; i < NUMBER_OF_FLAKES; i++) {
flakes_1.push(createFlake_1());
}
window.addEventListener('resize', function () {
if (canv.current) {
canv.current.width = window.innerWidth;
canv.current.height = window.innerHeight;
}
});
animate_1();
}
}, [canv]);
return React.createElement("canvas", { ref: canv, id: id });
};