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cobejs

Add a lightweight interactive globe to a web page with cobe. Covers location markers, rotation, canvas sizing, responsive updates, performance settings, and integration with React or Next.js for hero sections, about pages, and cards.

中文简介正在准备中。当前显示英语简介。

原文查看原文说明

Use when adding a lightweight interactive globe with cobe (canvas setup, markers, interaction, performance, integration with React/Next.js).

查看安装方法

适用场景

  • Adding a spinning globe to a hero section
  • Showing office locations with globe markers
  • Adapting globe rendering to mobile screens
  • Integrating a globe into React or Next.js

包含的文件(5)

  • SKILL.md2.2 KB
  • demo/index.html15.8 KB
  • demo/preview.jpg38.3 KB
  • demo/PROMPT.md1.7 KB
  • REFERENCES.md70 B

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

cobe.js — Lightweight WebGL Globe Skill

When to use

  • A “spinning globe” / location markers in hero or about pages
  • You want a small, focused globe lib (not full three.js)
  • Decorative + interactive (markers, rotation) with minimal setup

Key APIs/patterns

  • Core:
    • import createGlobe from "cobe"
    • const globe = createGlobe(canvas, { ...options, onRender(state) { ... } })
  • Important options (common):
    • devicePixelRatio, width, height
    • phi, theta (rotation angles)
    • scale, dark, diffuse
    • baseColor, markerColor, glowColor
    • markers: [{ location: [lat, lon], size, color? }]
  • Lifecycle:
    • globe.toggle() pauses RAF
    • globe.destroy() removes instance

Common pitfalls

  • Canvas sizing mismatch
    • Set CSS size AND set canvas width/height scaled for DPR.
  • Not updating on resize
    • Recompute width/height and recreate or update params.
  • Too high DPR on mobile
    • Clamp DPR to 1–2.

Quick recipe: responsive globe with markers

import createGlobe from "cobe";

const canvas = document.getElementById("cobe");
let phi = 0;

function setup() {
  const rect = canvas.getBoundingClientRect();
  const dpr = Math.min(window.devicePixelRatio, 2);
  canvas.width = Math.round(rect.width * dpr);
  canvas.height = Math.round(rect.height * dpr);

  const globe = createGlobe(canvas, {
    devicePixelRatio: dpr,
    width: canvas.width,
    height: canvas.height,
    phi: 0,
    theta: 0.2,
    dark: 0,
    diffuse: 1.2,
    scale: 1,
    mapSamples: 16000,
    mapBrightness: 6,
    baseColor: [0.2, 0.2, 0.25],
    glowColor: [1, 1, 1],
    markerColor: [0.8, 0.5, 1],
    markers: [{ location: [1.3521, 103.8198], size: 0.08 }],
    onRender: (state) => {
      state.phi = phi;
      phi += 0.01;
    },
  });

  return globe;
}

let globe = setup();
window.addEventListener("resize", () => {
  globe.destroy();
  globe = setup();
});

What to ask the user

  • Globe size and placement (hero, section, card)?
  • Marker locations + colors (brand-aligned)?
  • Interaction needs (drag to rotate vs. ambient spin)?

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