Shape of application of new features of CSS3

1. Adaptive ellipse

border-radius feature:

• The horizontal and vertical radii can be specified separately, and the value It can be a percentage, just use / (slash) to separate the two values ​​(adaptive width ellipse can be implemented).

• You can also separately specify four horizontal and vertical radii with different angles (semi-ellipse can be realized)

• Quarter ellipse, mainly Is to adjust the horizontal and vertical radius

Sample code:

.wrap{
            border-radius: 50% / 30%;
            width: 60px;
            height: 80px;
            background: yellow;
        }
        .wrap02{
            width: 60px;
            height: 80px;
            background: yellow;
            border-radius: 50% / 100% 100% 0 0;
        }
        .wrap03{
            width: 60px;
            height: 80px;
            background: yellow;
            border-radius: 100% 0 0 0;
        }

2. Flat quadrilateral

• ##Needs to be applied to the skewX of transform for distortion

• Mainly solves the problem that the container becomes a flat quadrilateral, and Internal text and elements are displayed vertically with

• nested elements. Internal elements can be reversely twisted using skew. Nested inner elements must be block because transform cannot be applied to inline elements.

• Use pseudo-elements to distort (:before)

.wrap{
            width: 80px;
            height: 40px;
            transform: skewX(-45deg);
            background: yellow;
        }
        .wrap>p{
            transform: skewX(45deg); 
        }
        .btn{
            position: relative;
            padding: 10px;
        }
        .btn:before{
            content: '';
            position: absolute;
            top: 0px;
            left: 0px;
            right: 0px;
            bottom: 0px;
            z-index: -1;
            background: #85a;
            transform: skewX(-45deg);
        }

3. Diamond shape

• Apply the nesting of elements, and the outer and inner elements rotate with each other to achieve eight Angular;

• Design the max-width width of the internal element to be 100%, so that the entire image can only fill the entire outer p;

## The #scale attribute controls the magnification of its image. By default, the center point is the origin of magnification (the Pythagorean theorem will be used, do not specify additional transform-origin).

.wrap{
            width: 200px;
            transform: rotate(-45deg);
            overflow: hidden;
        }
        .wrap > img{
            transform: rotate(45deg) scale(1.42); 
            max-width: 100%;
        }

##4. Corner cutting effect

• You also need to pay attention to the settings of the background-size and background-repeat attributes to prevent overlapping backgrounds from causing the effect to not take effect

.wrap{
            width: 200px;
            height: 100px;
            background: #58a;
            background: linear-gradient(-135deg, transparent 15px, #58a 0px) top right,
            linear-gradient(135deg,transparent 15px, #655 0px) top left,
            linear-gradient(-45deg, transparent 15px, #58a 0px) bottom right, 
            linear-gradient(45deg, transparent 15px, #655 0px) bottom left;
            background-size: 50% 50%;
            background-repeat: no-repeat;
        }

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• border-image uses svg to make pictures

• border sets the width + transparency, plus the border-image-slice is biased inward Shifting creates a border with cut corners;

• background-clip: Set to padding-box, otherwise the background will extend to the border.

.wrapSvg{
            border:15px solid transparent;
            border-image: 1 url(&#39;data:image/svg+xml, <svg xmlns="http://www.w3.org/2000/svg" width="3" height="3" fill="%2358a"><polygon points="0,1 1,0 2,0 3,1 3,2 2,3 1,3 0,2"/></svg>&#39;);
            margin-top: 50px;
            width: 200px;
            height: 100px; 
            background: #58a;
            background-clip: padding-box;
        }

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• css4 will directly give the corner-path attribute to support corner cutting
5. Trapezoid pattern

Understand the basic principles of transform

translate(displacement): matrix(1,0,0,1,x,y)

• ##scale(scale): matrix(x,0,0, y,0,0);

• skew (skew): matrix(1,tany,tanx,1,0,0), since the input is deg (angle), you need to Convert angles to radians

• rotate (rotate): matrix(cosN,sinN,-sinN,cosN,0,0), convert angles to radians

• The application of the above values ​​is related to the value of transform-origin, which is the origin of rotation of the positioning element, which can be top, bottom, center, etc. Three coordinate systems of x, y, and z can be specified
  perpective: Perspective, it cannot be negative, 0 or percentage, it can only be a numerical value;

• The farther the perspective distance is from the object, the smaller the object will appear

• Perspective can only be set on the parent or ancestor of the deformed element, because the browser will set it on its children. The deformation produces a perspective effect

• There is no skew attribute in 3D transformation.

• 六、简单的饼图

  动画饼图，效果如下：

  

  实现步骤如下：

  画出一个yellowgreen的圆，并利用linear-gradient设置background-image的值，实现两种颜色各显示一半的功能：

  然后加入一个伪元素，继承父级（真实元素）的背景色，然后用rotate旋转即可

  • 要利用margin-left让其靠左

  • 利用transform-origin设置其旋转定位点

  动画展示代码如下：

  @keyframes spin{
              to{ transform: rotate(.5turn); }
          }
          @keyframes bg{
              50%{ background-color: #655; }
          }
          .wrap{
              width: 100px; height: 100px;
              border-radius: 50%;
              background: yellowgreen;
              background-image: linear-gradient(to right, transparent 50%, #655 0); 
          } 
          .wrap::before{
              content: '';
              display: block;
              margin-left: 50%;
              background-color: inherit;
              height: 100%; 
              border-radius: 0 100% 100% 0 / 50%;
              transform-origin: left;
              animation:spin 3s linear infinite,
                  bg 6s step-end infinite;
          }

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