るるなのパン3

javascript:(function(){if(window.rurunaPan){window.rurunaPan.toggle();}else{class%20RurunaPan{constructor(){this.isRun=false;this.$video=document.querySelector("video");this.ctx=new%20AudioContext();this.src=this.ctx.createMediaElementSource(this.$video);this.pan=this.ctx.createStereoPanner();}start(){this.src.connect(this.pan);this.pan.connect(this.ctx.destination);let%20old_Pos=0;this.intervalId=setInterval(()=>{const%20current_Pos=(window.innerWidth/2+window.screenX)/(screen.availWidth/2)-1;if(current_Pos==old_Pos)return;old_Pos=current_Pos;this.pan.pan.setValueAtTime(current_Pos,this.ctx.currentTime);},1000/60);this.isRun=true;}stop(){clearInterval(this.intervalId);this.pan.pan.setValueAtTime(0,this.ctx.currentTime);this.isRun=false;}toggle(){if(this.isRun){this.stop();}else{this.start();}}}window.rurunaPan=new%20RurunaPan();window.rurunaPan.start();}})();