add examples grid (observablehq#1834)

docs/.vitepress/theme/CustomLayout.vue

@@ -1,6 +1,7 @@
 <script setup>
 
 import DefaultTheme from "vitepress/theme-without-fonts";
+import ExamplesGrid from "./ExamplesGrid.vue";
 import ObservablePromo from "./ObservablePromo.vue";
 
 const {Layout} = DefaultTheme;
@@ -9,8 +10,29 @@ const {Layout} = DefaultTheme;
 
 <template>
   <Layout>
+    <template #home-features-before>
+      <ExamplesGrid />
+    </template>
     <template #home-features-after>
       <ObservablePromo />
     </template>
   </Layout>
 </template>
+
+<style>
+
+.VPHome {
+  overflow-x: hidden; /* iOS */
+}
+
+.VPHome .VPFeature {
+  background-color: rgba(246, 246, 247, 0.5);
+  -webkit-backdrop-filter: blur(10px); /* Safari */
+  backdrop-filter: blur(10px);
+}
+
+.dark .VPHome .VPFeature {
+  background-color: rgba(37, 37, 41, 0.5);
+}
+
+</style>

docs/.vitepress/theme/ExamplesGrid.vue

@@ -0,0 +1,132 @@
+<script setup>
+
+import * as d3 from "d3";
+import {ref, shallowRef, onMounted, onUnmounted} from "vue";
+import {data} from "./gallery.data.js";
+
+let observer;
+let pointerframe;
+let clientX;
+
+const n = 60; // maximum number of examples to show
+const slice = d3.shuffler(d3.randomLcg(d3.utcDay()))(data.slice()).slice(0, n);
+const sample = shallowRef(slice.slice(0, 55)); // initial guess
+const container = ref();
+const xn = ref(10); // number of rows
+const yn = ref(5); // number of columns
+const x = ref(0.5); // normalized horizontal pointer position
+
+// Some browsers trigger pointermove more frequently than desirable, so we
+// debounce events for a smooth transitions.
+function onpointermove(event) {
+  if (!pointerframe) pointerframe = requestAnimationFrame(afterpointermove);
+  clientX = event.clientX;
+}
+
+function afterpointermove() {
+  pointerframe = null;
+  x.value = clientX / document.body.clientWidth;
+}
+
+onMounted(() => {
+  observer = new ResizeObserver(() => {
+    const w = parseFloat(getComputedStyle(container.value).getPropertyValue("--grid-width"));
+    xn.value = Math.ceil(document.body.clientWidth / w) + 3; // overflow columns
+    yn.value = Math.min(Math.round(640 / w + 2), Math.floor(n / xn.value)); // 640 is grid height
+    sample.value = slice.slice(0, yn.value * xn.value);
+  });
+  observer.observe(document.body);
+  addEventListener("pointermove", onpointermove);
+});
+
+onUnmounted(() => {
+  observer.disconnect();
+  removeEventListener("pointermove", onpointermove);
+});
+
+</script>
+
+<template>
+  <div :class="$style.examples" ref="container" :style="`transform: translate(${60 - x * 10}vw, 33%);`">
+    <div v-for="(d, i) in sample" :style="`--delay: ${((i % xn) / xn + (d3.randomLcg(1 / i)()) - 0.4) * 1}s;`">
+      <a :href="`https://observablehq.com/${d.path}${d.path.includes('?') ? '&' : '?'}intent=fork`" :title="[d.title, d.author].filter(Boolean).join('\n')" target="_blank" :style="`--x: ${(i % xn) - xn / 2 + (Math.floor(i / xn) % 2) * 0.5}; --y: ${Math.floor(i / xn) - yn / 2};`">
+        <img :src="`https://static.observableusercontent.com/thumbnail/${d.thumbnail}.jpg`" width="640" height="400" />
+      </a>
+    </div>
+  </div>
+</template>
+
+<style module>
+
+.examples {
+  position: relative;
+  height: 640px;
+  transition: transform 150ms ease-out;
+  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
+  --grid-width: 140px;
+}
+
+@media (min-width: 640px) {
+  .examples {
+    --grid-width: 160px;
+  }
+}
+
+@media (min-width: 960px) {
+  .examples {
+    --grid-width: 200px;
+  }
+}
+
+/* The drop-shadow should not be affected by the hexagon clip-path. */
+.examples div {
+  position: relative;
+  transition: filter 250ms ease-out;
+  animation: fade-in 350ms cubic-bezier(0.215, 0.610, 0.355, 1.000) var(--delay) backwards;
+}
+
+.examples div:hover {
+  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.4));
+  z-index: 3;
+}
+
+.examples a {
+  position: absolute;
+  --transform: perspective(75em) rotateX(30deg) rotateZ(-7deg) translate(calc(var(--x) * 100%), calc(var(--y) * 86.67%)) scale(1.145);
+  transform: var(--transform);
+  animation: drop-in 350ms cubic-bezier(0.215, 0.610, 0.355, 1.000) var(--delay) backwards;
+  transition: transform 250ms ease-out;
+  clip-path: polygon(50.0% 100.0%, 93.3% 75.0%, 93.3% 25.0%, 50.0% 0.0%, 6.7% 25.0%, 6.7% 75.0%);
+}
+
+.examples a:hover {
+  transform: var(--transform) translateZ(10px) scale(1.1);
+}
+
+.examples img {
+  aspect-ratio: 1;
+  object-fit: cover;
+  width: var(--grid-width);
+}
+
+@keyframes fade-in {
+  from {
+    filter: blur(20px);
+    opacity: 0;
+  }
+  to {
+    filter: none;
+    opacity: 1;
+  }
+}
+
+@keyframes drop-in {
+  from {
+    transform: var(--transform) translateY(-100px) translateZ(400px);
+  }
+  to {
+    transform: var(--transform);
+  }
+}
+
+</style>

docs/.vitepress/theme/gallery.data.js

@@ -0,0 +1,19 @@
+import {Runtime} from "@observablehq/runtime";
+
+export default {
+  async load() {
+    const runtime = new Runtime();
+    const module = runtime.module((await import("https://api.observablehq.com/@observablehq/plot-gallery.js?v=4")).default);
+    const data = [];
+    module.define("md", () => String.raw);
+    module.redefine("previews", () => (chunk) => data.push(...chunk));
+    const values = [];
+    for (const output of module._resolve("previews")._outputs) {
+      if (output._name) {
+        values.push(module.value(output._name));
+      }
+    }
+    await Promise.all(values);
+    return data;
+  }
+};

package.json

@@ -36,8 +36,8 @@
     "prepublishOnly": "rm -rf dist && rollup -c",
     "postpublish": "git push && git push --tags",
     "dev": "vite",
-    "docs:dev": "vitepress dev docs",
-    "docs:build": "vitepress build docs",
+    "docs:dev": "node --experimental-network-imports node_modules/vitepress/dist/node/cli.js dev docs",
+    "docs:build": "node --experimental-network-imports node_modules/vitepress/dist/node/cli.js build docs",
     "docs:preview": "vitepress preview docs"
   },
   "_moduleAliases": {
@@ -48,6 +48,7 @@
   ],
   "devDependencies": {
     "@esbuild-kit/core-utils": "^3.1.0",
+    "@observablehq/runtime": "^5.7.3",
     "@rollup/plugin-commonjs": "^25.0.2",
     "@rollup/plugin-json": "^6.0.0",
     "@rollup/plugin-node-resolve": "^15.0.1",

yarn.lock

@@ -521,6 +521,30 @@
     "@nodelib/fs.scandir" "2.1.5"
     fastq "^1.6.0"
 
+"@observablehq/inspector@^5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@observablehq/inspector/-/inspector-5.0.0.tgz#7dec08d4fa20dfb79977ce62f7cc4a814b44e595"
+  integrity sha512-Vvg/TQdsZTUaeYbH0IKxYEz37FbRO6kdowoz2PrHLQif54NC1CjEihEjg+ZMSBn587GQxTFABu0CGkFZgtR1UQ==
+  dependencies:
+    isoformat "^0.2.0"
+
+"@observablehq/runtime@^5.7.3":
+  version "5.9.1"
+  resolved "https://registry.yarnpkg.com/@observablehq/runtime/-/runtime-5.9.1.tgz#fd79f9cce8a165e123021ca2f72fe54e61f16d12"
+  integrity sha512-ACNFixkIFVihIaWrDGXxgjxVj4/cHx26kdfGDVpEX1mEVqgP1SnfQMoJyZoqG23txs+uUcyr8LG37NkMEsNpdw==
+  dependencies:
+    "@observablehq/inspector" "^5.0.0"
+    "@observablehq/stdlib" "^5.0.0"
+
+"@observablehq/stdlib@^5.0.0":
+  version "5.8.1"
+  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-5.8.1.tgz#50002b0d2a021890052d6f96700d86d15ca18c7d"
+  integrity sha512-ng6QQSzFbPQnMMeCUhUl/EPzpyrwfmGsujztGdPXS1ZYrLoAc9co4rhUC5Vv6dBh8E4yzZkxwNyTs73bLN4alQ==
+  dependencies:
+    d3-array "^3.2.0"
+    d3-dsv "^3.0.1"
+    d3-require "^1.3.0"
+
 "@one-ini/[email protected]":
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/@one-ini/wasm/-/wasm-0.1.1.tgz#6013659736c9dbfccc96e8a9c2b3de317df39323"
@@ -1434,7 +1458,7 @@ d3-delaunay@6:
     d3-dispatch "1 - 3"
     d3-selection "3"
 
-"d3-dsv@1 - 3", d3-dsv@3:
+"d3-dsv@1 - 3", d3-dsv@3, d3-dsv@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/d3-dsv/-/d3-dsv-3.0.1.tgz#c63af978f4d6a0d084a52a673922be2160789b73"
   integrity sha512-UG6OvdI5afDIFP9w4G0mNq50dSOsXHJaRE8arAS5o9ApWnIElp8GZw1Dun8vP8OyHOZ/QJUKUJwxiiCCnUwm+Q==
@@ -1517,6 +1541,11 @@ d3-random@3:
   resolved "https://registry.yarnpkg.com/d3-random/-/d3-random-3.0.1.tgz#d4926378d333d9c0bfd1e6fa0194d30aebaa20f4"
   integrity sha512-FXMe9GfxTxqd5D6jFsQ+DJ8BJS4E/fT5mqqdjovykEB2oFbTMDVdg1MGFxfQW+FBOGoB++k8swBrgwSHT1cUXQ==
 
+d3-require@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/d3-require/-/d3-require-1.3.0.tgz#2b97f5e2ebcb64ac0c63c11f30056aea1c74f0ec"
+  integrity sha512-XaNc2azaAwXhGjmCMtxlD+AowpMfLimVsAoTMpqrvb8CWoA4QqyV12mc4Ue6KSoDvfuS831tsumfhDYxGd4FGA==
+
 d3-scale-chromatic@3:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/d3-scale-chromatic/-/d3-scale-chromatic-3.0.0.tgz#15b4ceb8ca2bb0dcb6d1a641ee03d59c3b62376a"