From d482c3a0ea2f96c3ec3d0c683a6bd458ba03a719 Mon Sep 17 00:00:00 2001
From: F53 <fseusb@gmail.com>
Date: Thu, 9 Nov 2023 15:14:37 -0700
Subject: [PATCH] background

---
 .vscode/settings.json     | 10 ++++++-
 app.vue                   |  1 +
 assets/styles/misc.scss   |  5 +++-
 components/Background.vue | 34 +++++++++++++++++++++++
 nuxt.config.ts            |  1 +
 package-lock.json         | 33 +++++++++++++++++++++++
 package.json              |  1 +
 pages/index.vue           |  3 ++-
 utils/draw.ts             | 40 +++++++++++++++++++++++++++
 utils/math.ts             |  5 ++++
 utils/point.ts            | 57 +++++++++++++++++++++++++++++++++++++++
 utils/pointCloud.ts       | 41 ++++++++++++++++++++++++++++
 12 files changed, 228 insertions(+), 3 deletions(-)
 create mode 100644 components/Background.vue
 create mode 100644 utils/draw.ts
 create mode 100644 utils/math.ts
 create mode 100644 utils/point.ts
 create mode 100644 utils/pointCloud.ts

diff --git a/.vscode/settings.json b/.vscode/settings.json
index b68d8f4..cea9efd 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -35,5 +35,13 @@
     "json",
     "jsonc",
     "yaml"
-  ]
+  ],
+
+  // volar as formatter
+  "[vue]": {
+    "editor.defaultFormatter": "Vue.volar"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "Vue.volar"
+  }
 }
diff --git a/app.vue b/app.vue
index f8eacfa..804c170 100644
--- a/app.vue
+++ b/app.vue
@@ -1,4 +1,5 @@
 <template>
+  <Background />
   <NuxtLayout>
     <NuxtPage />
   </NuxtLayout>
diff --git a/assets/styles/misc.scss b/assets/styles/misc.scss
index 00fc8d0..98bc5d9 100644
--- a/assets/styles/misc.scss
+++ b/assets/styles/misc.scss
@@ -1,5 +1,8 @@
 // dark!
-:root { color-scheme: dark; }
+:root {
+  color-scheme: dark;
+  background-color: #0c0c0c;
+}
 
 // logical sizing
 * { box-sizing: border-box; }
diff --git a/components/Background.vue b/components/Background.vue
new file mode 100644
index 0000000..ad64460
--- /dev/null
+++ b/components/Background.vue
@@ -0,0 +1,34 @@
+<script setup lang="ts">
+const canvas: Ref<undefined | HTMLCanvasElement> = ref()
+const intervalId: Ref<undefined | NodeJS.Timeout> = ref()
+
+onMounted(() => {
+  if (!canvas.value)
+    return
+
+  initCanvas(canvas.value)
+  initPoints()
+
+  intervalId.value = setInterval(renderFrame, 8)
+  addEventListener('resize', useDebounce(handleResize, 250))
+})
+onBeforeUnmount(() => {
+  if (intervalId.value)
+    clearInterval(intervalId.value)
+})
+</script>
+
+<template>
+  <canvas id="background" ref="canvas" />
+</template>
+
+<style lang="scss">
+#background {
+  position: absolute;
+  top: 0; left: 0;
+  width: 100vw;
+  height: 100vh;
+  z-index: -1;
+  filter: blur(.5rem);
+}
+</style>
diff --git a/nuxt.config.ts b/nuxt.config.ts
index b6152fe..5c3c378 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -2,6 +2,7 @@
 export default defineNuxtConfig({
   devtools: { enabled: true },
   typescript: { strict: true, typeCheck: true, shim: false },
+  modules: ['nuxt-lodash'],
 
   css: ['~/assets/styles/layout.scss', '~/assets/styles/misc.scss', '~/assets/styles/font.scss'],
 
diff --git a/package-lock.json b/package-lock.json
index ee4ca0c..b442670 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,7 @@
         "eslint": "^8.52.0",
         "lint-staged": "^15.0.2",
         "nuxt": "^3.8.0",
+        "nuxt-lodash": "^2.5.3",
         "simple-git-hooks": "^2.9.0",
         "typescript": "^5.2.2",
         "vue": "^3.3.7",
@@ -2817,6 +2818,21 @@
       "integrity": "sha512-U3PUjAudAdJBeC2pgN8uTIKgxrb4nlDF3SF0++EldXQvQBGkpFZMSnwQiIoDU77tv45VgNkl/L4ouD+rEomujw==",
       "dev": true
     },
+    "node_modules/@types/lodash": {
+      "version": "4.14.200",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.200.tgz",
+      "integrity": "sha512-YI/M/4HRImtNf3pJgbF+W6FrXovqj+T+/HpENLTooK9PnkacBsDpeP3IpHab40CClUfhNmdM2WTNP2sa2dni5Q==",
+      "dev": true
+    },
+    "node_modules/@types/lodash-es": {
+      "version": "4.17.10",
+      "resolved": "https://registry.npmjs.org/@types/lodash-es/-/lodash-es-4.17.10.tgz",
+      "integrity": "sha512-YJP+w/2khSBwbUSFdGsSqmDvmnN3cCKoPOL7Zjle6s30ZtemkkqhjVfFqGwPN7ASil5VyjE2GtyU/yqYY6mC0A==",
+      "dev": true,
+      "dependencies": {
+        "@types/lodash": "*"
+      }
+    },
     "node_modules/@types/mdast": {
       "version": "3.0.14",
       "resolved": "https://registry.npmjs.org/@types/mdast/-/mdast-3.0.14.tgz",
@@ -8458,6 +8474,12 @@
       "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
+    "node_modules/lodash-es": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "dev": true
+    },
     "node_modules/lodash.debounce": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/lodash.debounce/-/lodash.debounce-4.0.8.tgz",
@@ -9730,6 +9752,17 @@
         }
       }
     },
+    "node_modules/nuxt-lodash": {
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/nuxt-lodash/-/nuxt-lodash-2.5.3.tgz",
+      "integrity": "sha512-LCJ40tGQTHkfk8rQoGqtb0mFgRVt8U+pc3S352DsI39yF3olqgxlsm28wdJMIcWHuxLgf5X+DwxmZhrAHXNS5g==",
+      "dev": true,
+      "dependencies": {
+        "@nuxt/kit": "^3.8.0",
+        "@types/lodash-es": "^4.17.10",
+        "lodash-es": "^4.17.21"
+      }
+    },
     "node_modules/nuxt/node_modules/acorn": {
       "version": "8.10.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.10.0.tgz",
diff --git a/package.json b/package.json
index 00ccb76..1fd7c6f 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "eslint": "^8.52.0",
     "lint-staged": "^15.0.2",
     "nuxt": "^3.8.0",
+    "nuxt-lodash": "^2.5.3",
     "simple-git-hooks": "^2.9.0",
     "typescript": "^5.2.2",
     "vue": "^3.3.7",
diff --git a/pages/index.vue b/pages/index.vue
index f7d70d4..9ec4111 100644
--- a/pages/index.vue
+++ b/pages/index.vue
@@ -35,7 +35,8 @@
   <div>
     <h2>TODO:</h2>
     <ul>
-      <li>background: pointcloud + something fancy with mouse movement + parallax scroll</li>
+      <li>background: optimize render</li>
+      <li>background: something fancy with mouse movement</li>
       <li>colors</li>
       <li>experience page: (education + jobs + projects) handled with markdown, click to learn more, filterable, sortable</li>
       <li>blog page: handled with markdown, filterable, sortable</li>
diff --git a/utils/draw.ts b/utils/draw.ts
new file mode 100644
index 0000000..944a81e
--- /dev/null
+++ b/utils/draw.ts
@@ -0,0 +1,40 @@
+import type { PointLike } from './point'
+
+let ctx: CanvasRenderingContext2D
+let screenMaxLength: number
+export function initDrawVars(ctx_: CanvasRenderingContext2D, screenMaxLength_: number) {
+  ctx = ctx_
+  screenMaxLength = screenMaxLength_
+}
+
+export function drawCircle(point: PointLike) {
+  ctx.beginPath()
+  ctx.arc(point.x, point.y, 4, 0, 360)
+  ctx.fill()
+}
+export function drawLine(point0: PointLike, point1: PointLike) {
+  const distance = dist(point0, point1)
+
+  let transparency = 1 - (distance / (screenMaxLength))
+  transparency = (transparency - 0.75) * 5
+  if (transparency < 0)
+    return
+  ctx.lineWidth = Math.min(transparency * 2, 3)
+
+  transparency *= 255
+  transparency = Math.floor(transparency)
+  if (transparency === 0)
+    return
+  if (transparency > 255)
+    transparency = 255
+
+  let opacityHex = transparency.toString(16)
+  if (opacityHex.length === 1)
+    opacityHex = `0${opacityHex}`
+  ctx.strokeStyle = `#FFFFFF${opacityHex}`
+
+  ctx.beginPath()
+  ctx.moveTo(point0.x, point0.y)
+  ctx.lineTo(point1.x, point1.y)
+  ctx.stroke()
+}
diff --git a/utils/math.ts b/utils/math.ts
new file mode 100644
index 0000000..408437b
--- /dev/null
+++ b/utils/math.ts
@@ -0,0 +1,5 @@
+import type { PointLike } from './point'
+
+export const rand = (min: number, max: number): number => Math.random() * (max - min) + min
+export const mod = (num: number, val: number): number => ((num % val) + val) % val
+export const dist = (point0: PointLike, point1: PointLike): number => Math.sqrt((point0.x - point1.x) ** 2 + (point0.y - point1.y) ** 2)
diff --git a/utils/point.ts b/utils/point.ts
new file mode 100644
index 0000000..f678b01
--- /dev/null
+++ b/utils/point.ts
@@ -0,0 +1,57 @@
+export class Point {
+  id: number
+  x: number
+  y: number
+  xV: number
+  yV: number
+
+  constructor(x?: number, y?: number) {
+    this.id = Point.all.length
+    this.x = x || rand(0, Point.maxX)
+    this.y = y || rand(0, Point.maxY)
+    this.xV = rand(-Point.maxSpeed, Point.maxSpeed)
+    this.yV = rand(-Point.maxSpeed, Point.maxSpeed)
+
+    Point.all.push(this)
+  }
+
+  step() {
+    this.x = mod(this.x + this.xV, Point.maxX)
+    this.y = mod(this.y + this.yV, Point.maxY)
+  }
+
+  render() {
+    // drawCircle(this)
+
+    // connect to other points
+    const leftX = -(Point.maxX - this.x)
+    const rightX = Point.maxX + this.x
+    const topY = -(Point.maxY - this.y)
+    const bottomY = Point.maxY + this.y
+
+    Point.all.forEach((point) => {
+      drawLine(point, { x: leftX, y: topY })
+      drawLine(point, { x: leftX, y: this.y })
+      drawLine(point, { x: leftX, y: bottomY })
+
+      drawLine(point, { x: this.x, y: topY })
+      if (point.id < this.id)
+        drawLine(point, this)
+      drawLine(point, { x: this.x, y: bottomY })
+
+      drawLine(point, { x: rightX, y: topY })
+      drawLine(point, { x: rightX, y: this.y })
+      drawLine(point, { x: rightX, y: bottomY })
+    })
+  }
+
+  static all: Point[] = []
+  static maxX: number
+  static maxY: number
+  static maxSpeed: number
+}
+
+export interface PointLike {
+  x: number
+  y: number
+}
diff --git a/utils/pointCloud.ts b/utils/pointCloud.ts
new file mode 100644
index 0000000..5aa80fc
--- /dev/null
+++ b/utils/pointCloud.ts
@@ -0,0 +1,41 @@
+let width: number, height: number
+let canvas: HTMLCanvasElement
+let ctx: CanvasRenderingContext2D
+
+export function handleResize() {
+  width = window.innerWidth
+  height = window.innerHeight
+  canvas.width = width
+  canvas.height = height
+  initPoints()
+}
+
+export function initCanvas(_canvas: HTMLCanvasElement) {
+  width = window.innerWidth
+  height = window.innerHeight
+
+  canvas = _canvas
+  canvas.width = width
+  canvas.height = height
+  ctx = canvas.getContext('2d')!
+  ctx.fillStyle = '#FFFFFF'
+  ctx.strokeStyle = '#FFFFFF'
+
+  initDrawVars(ctx, Math.sqrt(width ** 2 + height ** 2))
+}
+
+export function initPoints(numPoints: number = 30, maxSpeed: number = 0.25) {
+  Point.all = []
+  Point.maxX = width
+  Point.maxY = height
+  Point.maxSpeed = maxSpeed
+
+  Array.from({ length: numPoints }).forEach(() => new Point())
+}
+
+export function renderFrame() {
+  ctx.clearRect(0, 0, width, height)
+
+  Point.all.forEach(point => point.step())
+  Point.all.forEach(point => point.render())
+}