Ways to reduce the amount of time spent watching anime when it is not in view

My anime experiences glitches as the black container crosses the red, causing a decrease in duration. Is there a way to fix this glitch?

I attempted to delay the changes until the red path is completed, but the glitches persist.

delayInAnimeSub = ourVillanAnimeDuration * (ourVillanFigXValue / window.innerWidth)
animeDelayAmount = Math.abs(delayInAnimeSub.toFixed(2) - 0.2).toFixed(2);

I calculated the remaining distance of the red from the left side and determined the duration needed to cover that distance before adding it to the delay. However, the glitches still occur.

Below is the explanation of what happens:

  • The black box represents the hero controlled by space (to jump), < (to move left), > (to move right).
  • The red box represents the villain(demon) with an animation moving from right to left with a specific duration.
  • When the hero passes the red box, the red box speeds up by reducing the animation duration, leading to glitches where it starts from unexpected places.
  • I tried delaying the change in animation duration until the red box clears the screen, but it did not solve the issue.

let ourHeroFig = document.getElementById("ourHero");
let ourVillanFig = document.getElementById("obstacleBar");
let gameScoreDigits = document.getElementById("gameScoreDigits");
let valueXCoordinate = "";
let obstacleBarCrossed = true;

document.body.addEventListener('keydown', function(e) {
  let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
  let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));
  if (e.code === "ArrowRight") {
    valueXCoordinate = ourHeroFigXValue + 100;

  } else if (e.code === "KeyA" || e.code === "ArrowLeft") {
    if (ourHeroFigXValue > ourHeroFig.offsetWidth + 90) {
      valueXCoordinate = ourHeroFigXValue - 100;
    } else {
      valueXCoordinate = 0;
    }
  } else if (e.code === "Space") {
    ourHeroFig.classList.add("animateHero");
    setTimeout(function() {
      ourHeroFig.classList.remove("animateHero");
    }, 700)
  }
  changePosition();

})

function changePosition() {
  ourHeroFig.style.left = valueXCoordinate + 'px'
}

let delayInAnimeSub = ""
setInterval(
  function() {
    let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
    let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));
    let ourVillanFigXValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('left'));
    let ourVillanFigYValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('bottom'));
    let gameOverValueX = Math.abs(ourVillanFigXValue - ourHeroFigXValue);
    let gameOverValueY = Math.abs(ourVillanFigYValue - ourHeroFigYValue);

    if (gameOverValueX < ourVillanFig.offsetWidth && gameOverValueY < ourVillanFig.offsetHeight) {
      console.log("yes touched");
      ourVillanFig.classList.remove("animateVillan");
      obstacleBarCrossed = false;
    } else if (obstacleBarCrossed && gameOverValueX < ourVillanFig.offsetWidth) {
      ourVillanAnimeDuration = parseFloat(getComputedStyle(ourVillanFig).getPropertyValue('animation-duration'));
      delayInAnimeSub = ourVillanAnimeDuration * (ourVillanFigXValue / window.innerWidth)
      animeDelayAmount = Math.abs(delayInAnimeSub.toFixed(2) - 0.2).toFixed(2);
      console.log(animeDelayAmount, ourVillanAnimeDuration, ourVillanFigXValue)
      if (ourVillanAnimeDuration <= 2) {
        ourVillanAnimeDuration = 2
      }
      setTimeout(() => {
        ourVillanFig.style.animationDuration = ourVillanAnimeDuration - 0.1 + "s";
      }, animeDelayAmount);
    }
    // console.log(gameOverValueX,gameOverValueY)
  }, 10);
#ourHero {
  width: 20px;
  height: 100px;
  background-color: black;
  position: fixed;
  bottom: 0;
  left: 0;
  transition: 0.1s;
}

.animateHero {
  animation: animateHero 0.7s linear;
}

@keyframes animateHero {
  0% {
    bottom: 0;
  }
  50% {
    bottom: 350px;
  }
  100% {
    bottom: 0;
  }
}

#obstacleBar {
  width: 20px;
  height: 100px;
  background-color: red;
  position: fixed;
  bottom: 0;
  left: 50vw;
}

.animateVillan {
  animation: animateVillan 5s linear infinite;
}

@keyframes animateVillan {
  0% {
    left: 110vw;
  }
  100% {
    left: 0;
  }
}
<div id="ourHero"></div>
<div id="obstacleBar" class="animateVillan"></div>

Your assistance is greatly appreciated. Thank you!

javascripthtmlcssanimation

Answer №1

There is a method that involves using Animation.playbackRate, which is still in the experimental stage.

let VillRate = 1
...

// within the collision check

if (VillRate < 20) {
  ourVillanFig.getAnimations()[0].playbackRate += 0.2
  VillRate += 0.5
}

In the following code snippet, the speed of the red object will increase until a certain point every time it touches the black object. You can customize this behavior as needed.

let ourHeroFig = document.getElementById('ourHero')
let ourVillanFig = document.getElementById('obstacleBar')
let gameScoreDigits = document.getElementById('gameScoreDigits')
let valueXCoordinate = ''
let obstacleBarCrossed = true

let VillRate = 1

document.body.addEventListener('keydown', function(e) {
  let ourHeroFigXValue = parseInt(
    getComputedStyle(ourHeroFig).getPropertyValue('left')
  )
  let ourHeroFigYValue = parseInt(
    getComputedStyle(ourHeroFig).getPropertyValue('bottom')
  )
  if (e.code === 'ArrowRight') {
    valueXCoordinate = ourHeroFigXValue + 100
  } else if (e.code === 'KeyA' || e.code === 'ArrowLeft') {
    if (ourHeroFigXValue > ourHeroFig.offsetWidth + 90) {
      valueXCoordinate = ourHeroFigXValue - 100
    } else {
      valueXCoordinate = 0
    }
  } else if (e.code === 'Space') {
    ourHeroFig.classList.add('animateHero')
    setTimeout(function() {
      ourHeroFig.classList.remove('animateHero')
    }, 700)
  }
  changePosition()
})

function changePosition() {
  ourHeroFig.style.left = valueXCoordinate + 'px'
}

let delayInAnimeSub = ''
setInterval(function() {
  let ourHeroFigXValue = parseInt(
    getComputedStyle(ourHeroFig).getPropertyValue('left')
  )
  let ourHeroFigYValue = parseInt(
    getComputedStyle(ourHeroFig).getPropertyValue('bottom')
  )
  let ourVillanFigXValue = parseInt(
    getComputedStyle(ourVillanFig).getPropertyValue('left')
  )
  let ourVillanFigYValue = parseInt(
    getComputedStyle(ourVillanFig).getPropertyValue('bottom')
  )
  let gameOverValueX = Math.abs(ourVillanFigXValue - ourHeroFigXValue)
  let gameOverValueY = Math.abs(ourVillanFigYValue - ourHeroFigYValue)

  if (
    gameOverValueX < ourVillanFig.offsetWidth &&
    gameOverValueY < ourVillanFig.offsetHeight
  ) {
    if (VillRate < 20) {
      ourVillanFig.getAnimations()[0].playbackRate += 0.2
      VillRate += 0.5
    }
  }
}, 10)
#ourHero {
  width: 20px;
  height: 100px;
  background-color: black;
  position: fixed;
  bottom: 0;
  left: 0;
  transition: 0.1s;
}

.animateHero {
  animation: animateHero 0.7s linear;
}

@keyframes animateHero {
  0% {
    bottom: 0;
  }
  50% {
    bottom: 350px;
  }
  100% {
    bottom: 0;
  }
}

#obstacleBar {
  width: 20px;
  height: 100px;
  background-color: red;
  position: fixed;
  bottom: 0;
  left: 50vw;
}

.animateVillan {
  animation: animateVillan 5s linear infinite;
}

@keyframes animateVillan {
  0% {
    left: 110vw;
  }
  100% {
    left: 0;
  }
}
<div id="ourHero"></div>
<div id="obstacleBar" class="animateVillan"></div>

Answer №2

I attempted the following:

 if (ourVillanFigXValue < 10) {
    ourVillanFig.style.animationDuration = ourVillanAnimeDuration - 0.1 + "s";
  }

It seems to be working fine, but when the time is reduced to 4s and beyond that, the red doesn't start from the end but rather starts in between. It almost begins from the middle at around 3s.

let ourHeroFig = document.getElementById("ourHero");
let ourVillanFig = document.getElementById("obstacleBar");
let gameScoreDigits = document.getElementById("gameScoreDigits");
let valueXCoordinate = "";
let obstacleBarCrossed = true;

document.body.addEventListener('keydown', function(e) {
  let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
  let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));

  if (e.code === "ArrowRight") {
    valueXCoordinate = ourHeroFigXValue + 100;

  } else if (e.code === "KeyA" || e.code === "ArrowLeft") {
    if (ourHeroFigXValue > ourHeroFig.offsetWidth + 90) {
      valueXCoordinate = ourHeroFigXValue - 100;
    } else {
      valueXCoordinate = 0;
    }
  } else if (e.code === "Space") {
    ourHeroFig.classList.add("animateHero");
    setTimeout(function() {
      ourHeroFig.classList.remove("animateHero");
    }, 700)
  }
  changePosition();

})

function changePosition() {
  ourHeroFig.style.left = valueXCoordinate + 'px'
}

let delayInAnimeSub = ""
setInterval(
  function() {
    let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
    let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));
    let ourVillanFigXValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('left'));
    let ourVillanFigYValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('bottom'));
    let gameOverValueX = Math.abs(ourVillanFigXValue - ourHeroFigXValue);
    let gameOverValueY = Math.abs(ourVillanFigYValue - ourHeroFigYValue);

    if (ourVillanFigXValue < 10) {
      ourVillanFig.style.animationDuration = ourVillanAnimeDuration - 0.1 + "s";
    }
    if (gameOverValueX < ourVillanFig.offsetWidth && gameOverValueY < ourVillanFig.offsetHeight) {
      console.log("yes touched");
      ourVillanFig.classList.remove("animateVillan");
      obstacleBarCrossed = false;
    } else if (obstacleBarCrossed && gameOverValueX < ourVillanFig.offsetWidth) {
      ourVillanAnimeDuration = parseFloat(getComputedStyle(ourVillanFig).getPropertyValue('animation-duration'));
      console.log(ourVillanFigXValue < 0, ourVillanAnimeDuration)

      if (ourVillanAnimeDuration <= 2) {
        ourVillanAnimeDuration = 2
      }
    }
    // console.log(gameOverValueX,gameOverValueY)
  }, 10);
#ourHero {
  width: 20px;
  height: 180px;
  background-color: black;
  position: fixed;
  bottom: 0;
  left: 0;
  transition: 0.1s;
}

.animateHero {
  animation: animateHero 0.7s linear;
}

@keyframes animateHero {
  0% {
    bottom: 0;
  }
  50% {
    bottom: 350px;
  }
  100% {
    bottom: 0;
  }
}

#obstacleBar {
  width: 20px;
  height: 180px;
  background-color: red;
  position: fixed;
  bottom: 0;
  left: 50vw;
}

.animateVillan {
  animation: animateVillan 5s linear infinite;
}

@keyframes animateVillan {
  0% {
    left: 110vw;
  }
  100% {
    left: 0;
  }
}
<div id="ourHero"></div>
<div id="obstacleBar" class="animateVillan"></div>

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