canvas三角背景

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html

css

JavaScript

let canvas;
let ctx;
let w, h;
let colors;

function setup() {
  canvas = document.querySelector("#canvas");
  ctx = canvas.getContext("2d");
  reset();
  window.addEventListener("resize", () => {
    reset();
    draw();
  });
  canvas.addEventListener("click", draw);
  setupColors();
}

function reset() {
  w = canvas.width = window.innerWidth;
  h = canvas.height = window.innerHeight;
}

function setupColors() {
  colors = [
    //https://coolors.co/app/000000-ffffff-494949-7c7a7a-ff5d73
    [
      "#000000",
      "#ffffff",
      "#494949",
      "#7c7a7a",
      "#ff5d73"
    ],
    //https://coolors.co/app/6699cc-fff275-ff8c42-ff3c38-a23e48
    [
      "#6699cc",
      "#fff275",
      "#ff8c42",
      "#ff3c38",
      "#a23e48"
    ],
    //https://coolors.co/app/231942-5e548e-9f86c0-be95c4-e0b1cb
    [
      "#231942",
      "#5e548e",
      "#9f86c0",
      "#be95c4",
      "#e0b1cb"
    ],
    //https://coolors.co/ffffff-81f4e1-56cbf9-ff729f-d3c4d1
    [
      "#ffffff",
      "#81f4e1",
      "#56cbf9",
      "#ff729f",
      "#d3c4d1"
    ],
  ];
}

function getRandomColorTheme() {
  let index = Math.floor(Math.random() * colors.length);
  return colors[index];
}

setup();
draw();

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