前端通过不同方式画等腰梯形

1.css画

说明：css画出倒梯形

  <div class="outer-box">
  <div class="gradient_bg"></div>
  </div>

.outer-box{
  width: 50px;
  height: 50px;
  position: relative;
  //overflow: hidden;
}
/*使用transform属性后，梯形样式会溢出父容器*/
.gradient_bg {
  position: absolute;
  //left: 50%;
  top: 50%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #010101 13.46%, #1B3D55 59.95%);
  transform: perspective(0.1em) rotateX(179deg);
  border-radius: 5px;
}

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?2.canvas

说明：画出正梯形

    <canvas id="trapezoidCanvas" width="200" height="100"></canvas>

<script>
export default {
  name: "index",
  mounted() {
    this.ininShape()
  },
  methods:{
    ininShape(){
      // 获取画布元素
      const canvas = document.querySelector('#trapezoidCanvas');
      const ctx = canvas.getContext('2d');

      // 设置梯形的参数
      const topWidth = 30;
      const bottomWidth = 100;
      const height = 50;
      const trapezoidColor = '#008000'; // 绿色

      // 计算梯形的顶点坐标
      const xTopLeft = (canvas.width - topWidth) / 2;
      const xTopRight = xTopLeft + topWidth;
      const xBottomLeft = (canvas.width - bottomWidth) / 2;
      const xBottomRight = xBottomLeft + bottomWidth;
      const yTop = (canvas.height - height) / 2;
      const yBottom = yTop + height;

      // 绘制梯形
      ctx.fillStyle = trapezoidColor;
      ctx.beginPath();
      ctx.moveTo(xTopLeft, yTop);
      ctx.lineTo(xTopRight, yTop);
      ctx.lineTo(xBottomRight, yBottom);
      ctx.lineTo(xBottomLeft, yBottom);
      ctx.closePath();
      ctx.fill();
    }
  }
}
</script>

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如何想让它倒过来;直接沿着X旋转180度。

transform: rotateX(180deg)

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