Border usage you don’t know

Previous words:

Before reading this article, you may think that border just simply draws the border. After reading this article, I believe you will be the same as me. Say "Holy crap, it turns out that the border in CSS can be played like this." This article is mainly about sorting out some of my ideas after seeing others using pure CSS to draw triangles a long time ago. The article will introduce the effects of several small icons.

Use the border in CSS to draw an egg shape:

Yes, you read that right, here we are going to draw an egg-like effect.

Idea: We first use p to draw a square, and then use the setting border-radius: 50%;, so that we can get a circular effect, the code is as follows:

html code:

css code:

.p {
width: 100px;
height: 100px;
line-height: 100px;
background-color: aqua;
text- align: center;
border-radius: 50%;
}
The result is as shown in the figure:


##Thinking: Analyze the egg-shaped structure, The egg is a bit oval, but it has a big head and a small head. Is there any way for us to change the previous circle into an ellipse?

Idea: We change the width or height of p to make them inconsistent and see if we can get the effect we want.

Implementation: We change width:50px; or height:50px; (only change one of them), then the effects we get are:



Thinking: We have got the elliptical effect, how can we achieve the effect of big head and small head next?

Idea 1: Let’s divide the ellipse and control the width to be inconsistent. (This method was unsuccessful)

Idea 2: We set the percentage of border-radius. When border-radius: 100%; the screenshot of the previous method is as follows:



Try again to separate the value of the percentage of border-radius (do not abbreviate it, write it directly as 4), then the control percentage is inconsistent. Key code:

border-radius: 50% 50% 50% 50% / 62% 62% 38% 38%;
Screenshot of the effect obtained at this time:

Use the border in CSS to draw a triangle:

I believe everyone knows that border-color controls the border color, but you may not have tried it this way. Take a look at the following code:

html：

css：

.p {
width: 100px;
height: 100px;
border: 50px solid transparent;
border-color: yellow green red aqua;
}
The result is:



Thinking 1: What would happen if the p has no width and height?

Implementation results:



Thinking 2: The previous effect resulted in four triangles. Is there any way for us to separate the triangles from that p? Woolen cloth?

Idea: I haven’t come across anything about p separation so far (it probably doesn’t exist specifically), but let’s take a look at the CSS definition of “cascading style” and change our thinking. Is there any way we can Are the triangles we don't want overwritten?

Specific method: Set the color on the side we need to our background color - white, so you can get the effect we want. The code is as follows (taking the triangle you want to have on top as an example):

border-color: yellow white white white;

Does this complete our triangle effect?

We can try changing the background color of the entire body to black to see what changes:



We found that the p still occupies such a large space, And setting the background color to white is not the most scientific

Thought 4: How can we set the unwanted color to disappear?

Idea: We set the color we don’t want to show as the background color of the parent container, border-color: yellow transparent transparenttransparent;

The results are as follows:



Thinking 3: How can we set p so that it does not take up so much space?

Idea: directly remove the width of the border on the opposite side of the desired triangle

Specific method: (This time, take the desired triangle as an example), the code is as follows:

p{
width:0px;
height: 0px;
border-bottom: 50px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
The result is as shown in the figure:

Some thoughts on the extension of triangles:

Thinking 1: Our usual triangles include acute triangles, obtuse triangles, right-angled triangles, equilateral triangles, isosceles triangles, etc. Is there any way for us to get them directly? Is this the triangle effect we want?

Idea: When the base is parallel to the horizontal line, we directly control the aspect ratio to achieve the triangle effect we want; when it does not coincide with the horizontal line, it becomes more complicated, and we need to use the width Combining the high ratio with the transform attribute and rotate in CSS3 allows our triangle to show the effect we want (here is just an introduction to the idea, not a specific implementation. Among them If you have knowledge related to mathematics, you can use Baidu yourself).

Thinking 2: Can we use multiple triangles together to create more shapes?

(This can be possible. For example, we can use two triangles and a rectangle to form a parallelogram, or even use multiple ps to form a simple cabin effect...)

Supplement:

1. In the previous picture of our thinking one, we can see that the middle ones are actually trapezoids. Using the same method, we can get the effect of trapezoids (specific methods will not be introduced further).

2. By rotating, we can turn our square into a diamond shape

Production of polygons (taking hexagons as an example)

First we analyze the hexagon and see if we can decompose it into the simple graphics we mentioned before. Look at the picture below:



Analysis: Taking the above example, we can see that a hexagon is composed of two triangles and a rectangle.

Thinking 1: Is there any way for us to put these three graphics together?

Idea: Use pseudo elements: after and :before, and then draw graphics in their respective areas.

The reference code is as follows:




                                                          #                                                                              height: 55px;                                                                               ​ #hexagon:before { Content: "" "; ## Width: 0;
HEIGHT: 0; Position: absolute;                                                                             using use with using use using                       through         through ’ s ‐   ‐ ‐ ‐‐ and �                 to          #hexagon
:after
{
Content: "" "";
Width: 0;
Height: 0;
Position: absolute;
Bottom: -25px; LEFT: 0;                                                                                                   ’ ’ ’ ’ using use ’s ’ using       using using     through using using ‐ ‐ ‐ ‐ ‐ ‐ ,                                                                          lt;/style>
                                                 #(Of course the knowledge here introduces a situation, you can also try to have different sides of the triangle)

Production of a multi-pointed star (taking a six-pointed star as an example)

Analysis: Try to use the previous method to analyze the structure of a six-pointed star. We can understand that a six-pointed star is made up of two triangles overlapping together. OK, now it’s easy. Let’s look at the code directly:




UTF-8">
                                                                                                                                                                      
height: 0;
display
: block;
position: absolute;
border-left: 100px solid transparent;
        border-right: 100px solid transparent;                 border-bottom: 200px solid #de34f7;                       margin: 10px auto; content: "";
                        /*contentInsert content* /
width: 0;
height: 0;
position: absolute;
border-left: 100px solid transparent;
border-right: 100px solid transparent;
border-top : 200px solid #de34f7;
                margin: 60px 0 0 -100px;
        }
                               


The final effect is as shown in the figure:




Production of the five-pointed star (The actual operation is more difficult than the six-pointed star): We first draw a five-pointed star ourselves, then divide it into three, and then use the previous steps to implement it. Here I just list a method as a reference (there are several details in it The processing is a bit complicated), the analysis diagram is as follows:



##The reference code is as follows:




; ;
;
   
   
       

   

CSS small icon effect:

At this point, are you still not satisfied? Let me share the small CSS icon I made: Production of Dialog Box

Production of Dialog Box:

Analysis: The dialog box is composed of a triangle and a rounded corner

Implementation: The code is as follows:





                                                                                     dding
: 0px;
       }

                                width: 300px;
Height: 100px;
Background:#088cb7;
Position: Relative ER- radius: 12px;
}

        #comment_bubble:before {
                  content: ""; 0;
           right: 100%; Top: 38px; Position: absolute;
border-top: 13px solid transparent;
Border-right: 26px solid #088cb7;
​ ​ ​ ​ ​ border-bottom: 13px solid transparent;
}
                                                                                                                                                                                   , and then place a triangle where needed.

                                                             :






Following words:

Although these effects don’t look so cool, I remember that I just started learning this I was so excited when I said it. At that time, more effects were made (but those before the computer system was changed a few days ago are gone), so the effects shown are only very simple ones. This is all I can recall now, I will add more later as I think of it. If you have any good results, please share them below.





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