acos()

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css

/* åä¸ª <number> å¼ */
transform: rotate(acos(-0.2));
transform: rotate(acos(2 * 0.125));

/* å¶ä»å¼ */
transform: rotate(acos(pi / 5));
transform: rotate(acos(e / 3));

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acos(number) å½æ°ä»æ¥åä¸å¼ä½ä¸ºå¶åæ°ã

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number çåä½å¼¦å¼æ»å°è¿åä»äº 0deg å 180deg ä¹é´ç <angle>ã

è¥ number å°äº -1 æå¤§äº 1ï¼åç»æä¸º NaNã
è¥ number æ°ä¸º 1ï¼åç»æä¸º 0ã

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<acos()> = 
  acos( <calc-sum> )  

<calc-sum> = 
  <calc-product> [ [ '+' | '-' ] <calc-product> ]*  

<calc-product> = 
  <calc-value> [ [ '*' | / ] <calc-value> ]*  

<calc-value> = 
  <number>        |
  <dimension>     |
  <percentage>    |
  <calc-keyword>  |
  ( <calc-sum> )  

<calc-keyword> = 
  e          |
  pi         |
  infinity   |
  -infinity  |
  NaN

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ç±äº acos() å½æ°è¿å <angle>ï¼æå¯ç¨äºæè½¬ï¼rotateï¼åç´ ã

HTML

html

<div class="box box-1"></div>
<div class="box box-2"></div>
<div class="box box-3"></div>
<div class="box box-4"></div>
<div class="box box-5"></div>

CSS

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 50px;
}

css

div.box {
  width: 100px;
  height: 100px;
  background: linear-gradient(orange, red);
}
div.box-1 {
  transform: rotate(acos(1));
}
div.box-2 {
  transform: rotate(acos(0.5));
}
div.box-3 {
  transform: rotate(acos(0));
}
div.box-4 {
  transform: rotate(acos(-0.5));
}
div.box-5 {
  transform: rotate(acos(-1));
}