粒子雨

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html

css

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html

css

html,
body,
#drops {
  --mouse-position: 0rem;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  background: #090413;
  position: relative;
  overflow: hidden;
}

.controls {
  z-index: 2;
  color: white;
  position: absolute;
  top: 0;
  left: 0;
  font-family: "Courier New", Courier, monospace;
  margin: 1rem;
  font-size: 0.75rem;
  animation: fade 2s 4s forwards;
}
@keyframes fade {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}
.drop {
  width: 0.1rem;
  height: 2rem;
  left: var(--left);
  background: darkgray;
  opacity: var(--opacity);
  animation: drop linear var(--time) forwards;
  position: absolute;
  transform: rotate(var(--rotation));
}
@keyframes drop {
  from {
    top: 0;
    left: var(--left);
  }
  to {
    top: 100%;
    left: calc(var(--left) - var(--mouse-position));
  }
}
.splash {
  position: absolute;
  bottom: 0;
}
.splash:before {
  content: "";
  position: absolute;
  left: var(--left);
  width: 0.25rem;
  height: 0.25rem;
  border-radius: 50%;
  background: white;
  bottom: 0;
  opacity: var(--opacity);
  animation: splash var(--drop-time) cubic-bezier(0.33, 1, 0.68, 1);
}
@keyframes splash {
  0% {
    bottom: 0;
    left: var(--left);
  }
  100% {
    bottom: var(--drop-height);
    left: calc(var(--left) - calc(var(--mouse-position) / 4));
    opacity: 0;
  }
}

JavaScript

console.clear();

const drops = 25;
const dropsContainer = document.querySelector("#drops");

dropsContainer.onmousemove = (e) => {
  mousePositionX = Math.floor(
    map(e.clientX, 0, dropsContainer.offsetWidth, 10, -10)
  );
  if (
    dropsContainer.style.getPropertyValue("--mouse-value") !== mousePositionX
  ) {
    dropsContainer.style.setProperty("--mouse-value", mousePositionX);
    dropsContainer.style.setProperty(
      "--mouse-position",
      `${mousePositionX}rem`
    );
    dropsContainer.style.setProperty("--rotation", `${mousePositionX}deg`);
  }
};

Array(drops)
  .fill(1)
  .forEach(() => {
    createDrop();
  });

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}

function map(value, istart, istop, ostart, ostop) {
  return ostart + (ostop - ostart) * ((value - istart) / (istop - istart));
}

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