const stage = new createjs.Stage("myCanvas"); const WIDTH = window.innerWidth; const HEIGHT = window.innerHeight; stage.canvas.width = WIDTH; stage.canvas.height = HEIGHT; // 初期設定 stage.mouseX = stage.canvas.width / 2; stage.mouseY = stage.canvas.height / 3; let particles = []; let count = 0; const SIZE = 10; const AMOUNT = 5; // 1FPSで生成する量 const DECIMATION = 1; // パーティクルを間引く量 const MAX_LIFE = 50;