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# examples of Math Graphics 数学函数图 制图法

## 2.3. Surface 2D

Content
1. Classication by plot function 按制图函数分类:
2. Classication by appliaction 按应用分类:
3. Graphics objects
4. Drawing

### single variable with integral(x)

1. integral(semicircle(1)) semicircle with radius 1.

#### animation

add the function timer(x) for animation
2. integral(semicircle(timer(4))) semicircle with radius from 0 to 4.

### two variables with contour3D(x-y)

3. contour3D( x*x+y*y-1) circle
4. contour3D( sin(x*x+y*y-1) ) target
5. contour3D( y-sin(x) ) sine

#### animation

add the function timer(x) for animation
6. contour3D( y-sin(x-timter(9)) ) sea
7. coloring square 变色花环

### two variables with parametric3D(x,x,x-y)

The first two parameters are the same as x or y, the last parameter is x and y
8. parametric3D(x,x,sin(x)-y)
9. parametric3D(y,y,sin(y)-sin(x)) sine wave

### Drawing with math Hand

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### Reference 参阅

• example 例题
• graph 制图
• graphics 制图法
• animation 动画 ﻿