• ## Teach you how to draw the new Xiaomi logo with CSS painting API, but border radius can’t be drawn

Time：2022-7-10

This is Xiaomi’s new logoYou can’t draw it with border radiusBecause the circle of this graph is [hyperellipse]Can border radius write hyperellipses? What is hyperellipse Superellipse, also known as Lam é curve, is a closed curve similar to ellipse, which retains the characteristics of ellipse’s long axis, short axis and symmetry. How to do it […]

• ## CSS cold knowledge scenario

Time：2022-5-19

inherit Specifies that an attribute should inherit its value from the parent element div{ color:#fff000 } div>a{ color:inherit } background-clip background-clip: border-box|padding-box|content-box Border box defaults. The background is drawn inside the border box (cut into a border box). The padding box background is drawn inside the padding box (cut into a padding box). The content […]

• ## Understanding Schnorr Signature Algorithm

Time：2022-4-12

In the previous chapter, we talked about that the aggregate signature used in wisdomchain is the signature aggregation of their respective keys generated by all parties using Schnorr Signature. Today, let’s learn about the past and present life of Schnorr Signature Algorithm. Schnorr Signature Algorithm was first proposed by German Cryptologist Claus Schnorr in 2008. […]

• ## What are bitcoin’s private key, public key and address?

Time：2022-3-23

In bitcoin, three words often appear:Private key, public key and address。 What do they mean? What kind of relationship do they have? Understanding the relationship and differences between them is the basis for understanding bitcoin. Private key Let’s talk about the private key first. Generally, the private key we see is the following string: 5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss […]

• ## How is the bitcoin address generated

Time：2022-3-19

come fromJian Shu btc address: 1FmWXNJT3jVKaHBQs2gAs6PLGVWx1zPPHf Manually generating bitcoin address seems a little easier. If you understand this process, you will understand that the dazzling bitcoin address is only a different display mode of the private key. It is also very helpful to understand the ETH EOS address, and you can also better understand how […]

• ## R draw flower plot

Time：2022-2-3

Petal diagram flower.png For the multi sample study, we can draw the petal map to show the unique number of OTUs and the common number of OTUs of each sample more intuitively. Principle of drawing petal map Because there is no relevant R package, it refers to the blog（https://www.cnblogs.com/xudongliang/p/7884667.html）It is mentioned that the petal map […]

• ## Teach you how to draw a new Xiaomi logo with CSS painting API, but border radius can’t

Time：2021-11-27

This is Xiaomi’s new logoYou can’t draw it with border radiusBecause the circle of this graph is [hyperellipse]Can border radius write hyperellipses? What is hyperellipse Hyperellipse, also known as Lam é curve, is a closed curve similar to ellipse, which retains the characteristics of long axis, short axis and symmetry of ellipse. How useCSS Painting […]

• ## R language principal component analysis (PCA) wine visualization: dispersion point diagram and load diagram of principal components

Time：2021-10-19

Original link:http://tecdat.cn/?p=22492  === We will use the wine data set for principal component analysis. data Data frame with 177 samples and 13 variables; Vintages contains class labels. These data are the results of chemical analysis of wines grown in the same region of Italy but from three different cultivated varieties: Nebiolo, Barbera and Grignard grapes. […]

• ## [openxml] convert openxml’s elliptical arc arcto to SVG’s elliptical arc

Time：2021-10-6

This article describes how to convert ACTTO of openxml to the arc of SVG (a) Artto for openxml First, the following is an arcto arc of openxml Assuming that our current point is (0,0), the information we know is as follows: Current point coordinates: (x1, Y1) = (0,0) Radius of ellipse: semimajor axis RX = […]

• ## Code implementation of ECC algorithm

Time：2021-9-27

Code implementation of ECC algorithm What is ECC algorithm Elliptic curve cryptography, or ECC. Is a public key encryption algorithm based on elliptic curve mathematics. The use of elliptic curve in cryptography was independently proposed by Neal Koblitz and Victor Miller in 1985. Details link https://www.cnblogs.com/Kalafinaian/p/7392505.html 。 If you can insist on reading the above […]

• ## Foundation of Android custom controls (1) — geometry drawing

Time：2021-7-3

Although I have a few years of development experience, but the custom control together, little research, shame… When used is Baidu search, copy and paste. Working hours are tight. I always want to finish it as soon as possible（ It’s all excuses. If you want to learn, there will always be time As an Android […]

• ## Weekly canvas animation — circular motion

Time：2021-5-1

Next to “weekly canvas animation” — wave motion Circular motion can be divided into two basic formsCircular motionandElliptical motion。Before explaining circular motion, the essential mathematical formula is about to come. So, ladies and gentlemen, please protect your knees. It doesn’t matter if you don’t understand, just understand the principle. Of course, can understand is the […]