1 files changed, 117 insertions, 0 deletions
diff --git a/scripts/script.js b/scripts/script.js
new file mode 100644
index 0000000..b3efd73
--- /dev/null
+++ b/scripts/script.js
@@ -0,0 +1,117 @@
+const IMGS = [
+  "/img/rains/arch.png",
+  "/img/rains/bmo.png",
+  "/img/rains/cat.gif",
+  "/img/rains/demi.png",
+  "/img/rains/dnd.png",
+  "/img/rains/eattherich.png",
+  "/img/rains/gloomhaven.png",
+  "/img/rains/iron_throne.png",
+  "/img/rains/link.png",
+  "/img/rains/meddle.jpeg",
+  "/img/rains/moon.png",
+  "/img/rains/note.png",
+  "/img/rains/obsidian.png",
+  "/img/rains/outerwilds.png",
+  "/img/rains/piano.png",
+  "/img/rains/pirate.svg",
+  "/img/rains/ror.png",
+  "/img/rains/smashball.svg",
+  "/img/rains/ssa.png",
+  "/img/rains/svelte.png",
+  "/img/rains/usu.png",
+];
+
+const DROPLETS = 8;
+const DROPLET_WIDTH_RANGE = [80, 120];
+const DROPLET_DY_RANGE = [0.1, 0.4];
+const DROPLET_DTHETA_RANGE = [-0.25, 0.25];
+const DROPLET_INIT_THETA_RANGE = [-180, 180];
+
+const makeDroplet = (src, width, x, y, theta, dtheta, dy) => {
+  const img = document.createElement("img");
+  img.style.position = "absolute";
+  img.style.width = `${width}px`;
+  img.src = src;
+  document.body.appendChild(img);
+
+  return {
+    img,
+    width,
+    theta,
+    pos: { x, y },
+    vel: { dy, dtheta },
+  };
+};
+
+const randBetween = (min, max) => Math.random() * (max - min) + min;
+
+const update = (droplets, dt, boundedY) =>
+  droplets
+    .map((droplet) => {
+      return {
+        ...droplet,
+        pos: { ...droplet.pos, y: droplet.pos.y + droplet.vel.dy * dt },
+        theta: droplet.theta + droplet.vel.dtheta * dt,
+      };
+    })
+    .map((droplet) => {
+      const {
+        pos: { y },
+        img,
+      } = droplet;
+      if (y >= boundedY) {
+        document.body.removeChild(img);
+        return null;
+      }
+      return droplet;
+    })
+    .filter((x) => x)
+    .map((droplet) => {
+      const {
+        img,
+        pos: { x, y },
+        theta,
+      } = droplet;
+
+      img.style.left = `${x}px`;
+      img.style.top = `${y}px`;
+      img.style.transform = `rotate(${theta}deg)`;
+
+      return droplet;
+    });
+
+const buildRandomDroplet = () =>
+  makeDroplet(
+    IMGS[Math.floor(randBetween(0, IMGS.length))],
+    randBetween(...DROPLET_WIDTH_RANGE),
+    randBetween(0, window.innerWidth - DROPLET_WIDTH_RANGE[1]),
+    randBetween(-50, window.innerHeight / 8),
+    randBetween(...DROPLET_INIT_THETA_RANGE),
+    randBetween(...DROPLET_DTHETA_RANGE),
+    randBetween(...DROPLET_DY_RANGE),
+  );
+
+window.onload = () => {
+  // cache 'em
+  IMGS.forEach((x) => {
+    ((img) => (img.src = x))(new Image());
+  });
+
+  let droplets = Array(DROPLETS).fill().map(buildRandomDroplet);
+
+  let lastTimestamp = performance.now();
+  const next = (timestamp) => {
+    const dt = timestamp - lastTimestamp;
+    lastTimestamp = timestamp;
+
+    droplets = update(droplets, dt, window.innerHeight);
+
+    if (droplets.length != DROPLETS) {
+      droplets.push(buildRandomDroplet());
+    }
+
+    requestAnimationFrame(next);
+  };
+  requestAnimationFrame(next);
+};