如何减少动画离开屏幕时的时间

Question

我有一个动画，当黑色容器变成红色时，它的持续时间会减少，但这会产生故障。有什么方法可以消除其中的故障吗？

我试图延迟更改，直到红色完成路径，但仍然面临故障。

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

我计算了红色与左侧的剩余距离，并获得了完成该距离的持续时间并将其添加到延迟中。但它仍然显示故障。

sn-p下面会发生什么

• 黑盒子是由space（跳跃）、<（向左移动）、>（向右移动）控制的英雄。
• 红色是恶棍（恶魔），它有动画从右侧移动到左侧，动画有一定的持续时间。
• 每当英雄通过红色时，红色会变得更快（通过尝试减少动画持续时间），但是这种红色会出现故障并且从任何地方开始（而不是从下一个应该在的位置）。

• 我想提高红色的速度，但遇到了故障，因此试图延迟动画持续时间的变化，直到红色穿过屏幕，但这似乎不起作用

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>

提前感谢您的帮助

Answer 1

一种方法是使用Animation.playbackRate，但它仍处于试验阶段。

let VillRate = 1
...

// inside the collision check

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

在下面的sn-p中，每次碰到黑色时，红色的速度都会增加，直到某个点。您可以根据需要调整该行为。

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

我试过了：

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

它工作正常，但是当时间减少到4s 之后，红色不是从末尾开始，而是从中间开始。几乎从3s中间开始

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>