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# CSS matrix function

2022-04-29 16:27:15【Nirvana happiness is gold】

`matrix()`

yes CSS Of `transform`

A basic property of , It can realize many advanced 、 Complex effects , actually `transfrom`

Of `translate`

、`rotate`

And so on `matrix`

Based on the implementation of a simplified version of the syntax .

## Fundamentals of linear algebra

To understand and use, you must be familiar with vector and matrix knowledge of Linear Algebra , The course of linear algebra that I studied at the beginning has long been returned to the teacher , Because I don't know what's the use , If you know you'll use it today , I will study linear algebra well at the beginning 、 Advanced mathematics courses .

（1） vector

Vectors are used to describe direction and size , Cartesian coordinate system is generally used to describe vectors , Like vector `(2, 1)`

and `(3, 3)`

In the coordinate system, it is expressed as follows ：

Addition of vectors 、 Both subtraction and multiplication are operations on the coordinates of the corresponding position ：

```
(8, 2) + (2, 6) = (8 + 2, 2 + 6) = (10, 8)
(8, 2) - (2, 6) = (8 - 2, 2 - 6) = (6, -4)
(8, 2) * (2, 6) = (8 * 2, 2 * 6) = (16, 12)
Copy code
```

（2） matrix

Matrix is a common tool in advanced algebra , Arrange the numbers in a rectangular array , It is convenient for higher mathematical operations such as statistical analysis , One `2 X 3`

That is to say, this matrix has 2 That's ok 3 Column

When adding matrices of the same size , Is the sum of the corresponding positions ：

When matrices multiply , The corresponding position of each row of the former matrix will be multiplied by the corresponding position of each row of the latter matrix , And then add up the results , The number of rows of the resulting matrix is equal to the number of rows of the left matrix , The number of columns is equal to the number of columns of the matrix on the right , for example

`matrix`

Method

CSS3 Medium `transfrom`

Of `matrix()`

The method is as follows ：

```
transform: matrix(a,b,c,d,e,f);
Copy code
```

There are six parameters , It corresponds to a `3*3`

Matrix , The writing direction is vertical ：

During coordinate transformation （2D coordinate ）, Suppose the coordinates of the target point are `(x, y)`

, Then the conversion formula is as follows ：

The first and second rows of the new matrix are the transformed abscissa and ordinate .

It should be noted that `transfrom-origin`

This property is the origin of the deformation , It will affect the calculation of point coordinates , Our gang will set it to `0 0`

## Example

Suppose there is such an element ,CSS Properties are as follows ：

```
#transformedObject {
position: absolute;
left: 0px;
top: 0px;
width: 200px;
height: 80px;
}
Copy code
```

At this time, the page effect is as follows ：

Let's do... On this element `transform: matrix()`

Transformation of ：

```
#transformedObject {
position: absolute;
left: 0px;
top: 0px;
width: 200px;
height: 80px;
transform: matrix(0.9, -0.05, -0.375, 1.375, 220, 20);
transform-origin: 0 0;
}
Copy code
```

Notice that we set up

`transform-origin`

Conduct `matrix`

The principle of operation is the same as that mentioned above , With `(200, 80)`

For example ：

The effect of applying the transformation is as follows ：

Add a link to online editing ：www.useragentman.com/matrix/#

`matrix`

Relationship with other attributes

`matrix`

Is the most basic change , It has six parameters , These six parameters give special values , Can be realized `translate`

/`rotate`

And other special effects ：

With `translate`

distance , When the coordinate point is `(10px, 10px)`

, Conduct `translate(50px 50px)`

When , The coordinates of the result will be `(60px, 60px)`

If you use `matrix()`

Make changes , According to the picture above , The parameters that need to be given are `matrix(1, 0, 0, 1, 50, 50)`

, The process of performing an operation ：

```
1 0 50 10 1 * 10 + 0 * 10 + 50 * 1 60
0 1 50 * 10 = 0 * 10 + 1 * 10 + 50 * 1 = 60
0 0 1 1 0 * 10 + 0 * 10 + 1 * 1 1
Copy code
```

The result is the same .

Yes `matrix`

With understanding , You can use `matrix`

At the same time 、 Compound change , Thus, more complex animation can be realized .

## Reference resources

copyright notice

author[Nirvana happiness is gold],Please bring the original link to reprint, thank you.

https://en.qdmana.com/2022/04/202204291627095189.html

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