Function flash

src/index.js:274–305

(baseBg,baseFg,flashBg,flashFg)

}

function flash(baseBg,baseFg,flashBg,flashFg){
  let flashValue={v:0};
  function transitionFlash(to,t=0.025){
    return new Promise((resolve,reject)=>{
      TweenLite.to(flashValue,t,{
        v:to,
        ease:Quint.easeOut,
        onUpdate:()=>{
          generateTextures(baseFg,baseBg);
          generateTextures(flashFg,flashBg,flashValue.v);
          renderer.updateTextures();
        },
        onComplete:()=>{
          resolve();
        }
      });
    });
  }

  let lastFlash=transitionFlash(1);
  times(random(2,7),(i)=>{
    lastFlash=lastFlash.then(()=>{
      return transitionFlash(random(0.1,1))
    })
  })
  lastFlash=lastFlash.then(()=>{
    return transitionFlash(1,0.1);
  }).then(()=>{
    transitionFlash(0,0.25);
  });

}
function generateTextures(fg,bg,alpha=1){
  textureFgCtx.globalAlpha=alpha;
  textureFgCtx.drawImage(fg,0,0,textureFgSize.width,textureFgSize.height);