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CSS

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JavaScript

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HTML 

              
                <h1>conic-gradient 绘制</h1>
  <h4>三角形</h4>
  <div class="wrap">
    <div class="d d1"></div>
  </div>
  <h4>箭头</h4>
  <div class="wrap">
    <div class="d d2-1"></div>
  </div>
  <h4>河流</h4>
  <div class="wrap">
    <div class="d d2"></div>
  </div>
  <h4>矩形</h4>
  <div class="wrap">
    <div class="d d3"></div>
  </div>
  <h4>角落的点</h4>
  <div class="wrap">
    <div class="d d4-1"></div>
  </div>
  <h4>棋盘</h4>
  <div class="wrap">
    <div class="d d4"></div>
  </div>
  <h4>虚线</h4>
  <div class="wrap">
    <div class="d d5"></div>
  </div>
  <h4>十字线</h4>
  <div class="wrap">
    <div class="d d6"></div>
  </div>
  <h4>角标</h4>
  <div class="wrap">
    <div class="d d7"></div>
  </div>
  <h4>三角角标</h4>
  <div class="wrap">
    <div class="d d8"></div>
  </div>
!

CSS 

              
                html,
body {
  margin: 0;
  /* height: 100%; */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: aliceblue;
  gap: 10px;
}
body{
  padding: 50px;
}
.wrap{
  display: flex;
  gap: 10px;
}
.d{
  width: 100px;
  height: 100px;
  outline: 1px dashed;
  overflow: hidden;
  /* resize: horizontal; */
}
.d1{
  --deg: 0deg;
  transition: 3s --deg;
  background: conic-gradient( from -45deg, royalblue 90deg, transparent 0deg);
  /* background: linear-gradient( -45deg, royalblue 50%, transparent 0); */
}
.d2-1{
  background: conic-gradient(from 30deg at 0 50%, transparent 120deg, royalblue 0deg),
    conic-gradient(from 30deg, royalblue 120deg, transparent 0deg);
  background-size: 40px 60px;
  background-position: 20px 50%, -20px 50%;
  background-repeat: repeat-x;
}
.d2{
  background: conic-gradient(from 30deg at 0 50%, transparent 120deg, royalblue 0deg),
    conic-gradient(from 30deg, royalblue 120deg, transparent 0deg);
  background-size: 40px 60px;
  background-position: 20px 50%, -20px 50%;
}
.d3{
  background: conic-gradient(  royalblue 90deg, transparent 0deg);
}
.d4-1{
  background: conic-gradient( from -90deg at 40px 40px, royalblue 90deg, transparent 0deg);
  background-position: -20px -20px;
}
.d4{
  background: conic-gradient(  royalblue 90deg, transparent 0deg 180deg, royalblue 180deg 270deg, transparent 0deg);
  background-size: 20px 20px;
}
.d5{
  background: conic-gradient( from -90deg at 10px 4px,  royalblue 90deg, transparent 0deg);
  background-size: 30px 30px;
}
.d6{
  background: conic-gradient( from -90deg at 10px 4px,  royalblue 90deg, transparent 0deg),
    conic-gradient( from -90deg at 4px 10px,  royalblue 90deg, transparent 0deg);
  background-size: 30px 30px;
  background-position: 0 3px, 3px 0;
}
.d7{
  background: conic-gradient( from -90deg at 20px 8px,  royalblue 90deg, transparent 0deg),
    conic-gradient( from -90deg at 8px 20px,  royalblue 90deg, transparent 0deg);
  background-position: -10px -4px, -4px -10px;
}
.d8{
  background: conic-gradient( from -45deg at 10px 10px,  royalblue 90deg, transparent 0deg),
    conic-gradient( from 135deg at left 10px bottom 10px,  royalblue 90deg, transparent 0deg);
  background-position: -10px 0;
}
!

JS
!
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