What is seth in Python?

Turtle library is a very popular function library for drawing images in the Python language. The turtle.seth(angle) function in Turtle represents the direction of movement of the turtle when it starts. It contains one input parameter, which is the angle value.

You need to import the library before use: import turtle

• turtle.setup(width,height,startx,starty)
　-setup() setting The position and size of the form
The coordinates relative to the starting point of the desktop and the width and height of the window. If the starting point of the window is not written, it defaults to the center of the desktop
The coordinate origin of the form defaults to the window Center
• Absolute coordinates
　○ turtle.goto(100,100): refers to pointing from the current point to the coordinates given in brackets
• Turtle coordinates, the current point is regarded as the coordinate, with forward direction, backward direction, left direction Direction, right direction
○ turtle.fd(d): refers to running in the forward direction of the turtle
○ turtle.bk(d): refers to running in the opposite direction of the turtle
○ turtle.circle( r,angle): Refers to circular motion along a certain point on the left side of the turtle
•Absolute angle
○ turtle.seth(angle): Only changes the direction of the turtle's movement (the angle is counterclockwise), but does not move forward , angle is an absolute degree
• Turtle angle
　○ turtle.left(angle)
　○ turtle.right(angle)

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1. RGB color system

The color value range of rgb is an integer from 0-255 or a decimal from 0-1

2. Switch RGB color mode

turtle.colormode(mode)

1.0: RGB decimal mode 255: RGB integer mode

3. Brush Control function

1. turtle.penup() alias turtle.pu()                                                                                                                                                                                                                                  . , leaving traces
3, turtle.pensize(width) alias turtle.width(width) Brush width
4, turtle.pencolor(color)
Color is a color string or rgb value
eg ：turtle.pencolor("purple") color string
　 Turtle.pencolor(0.63,0.13,0.94)RGB decimal value
　 Turtle.pencolor((0.63,0.13,0.94))RGB tuple value

4. Movement control function

1, TURTLE.FORWORD (D) Alias ​​turtle.fd (d) Moving forward

D: Migration distance, you can be for the distance, you can be for the distance, you can be for the distance, you can be for the distance. Negative number
2, turtle.circle(r,extent=None)
Based on the radius r, draw an extent angle radian
r: The default circle center is r distance to the left side of the turtle

5. Direction control function

1. turtle.setheading(angle) alias turtle.seth(angle)                                                                                                                                                                                                          shall change the direction of travel

2. angle: the angle at which the direction is changed (in absolute coordinates , absolute angle)
3. turtle.left(angle)
4. turtle.right(angle)
angle: the angle turned in the current direction (turtle angle)

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