干渉縞のつもりです。
二つの波源による波の干渉をシミュレートするプログラムです。
色の濃さで変位量を表現しています。
よく見れば、振幅が二倍になる場所・打ち消し合う場所が分かるかと思います。

There are two sources of waves. Its thickness of color indicates the amplitude.
You can track the imaginary lines on which both waves are same phase then the amplitude become twice as large as the original wave (intensify each other).
There are also other imaginary lines on which both waves are counter phase then the amplitude is about zero (cancellation).