Learning Python's turtle library (a)

　　Turtle Gallery, also known as sea turtles library is one of the important Python standard library, can perform basic graphics rendering. Turtle library while graphing the basic framework of: a hatchlings crawling in a coordinate system, which forms a crawler track pattern drawing. Just start drawing, small turtles is located in the center of the canvas, where the coordinates (0,0), the forward direction is horizontal to the right.

Turtle basic function library

turtle.setup(a,b,c,d)	(A, b): Enter the width and height are integers, denotes a pixel; is a decimal, the computer indicates the ratio occupied by the screen (Startx, starty): the position of the vertex coordinates of the upper left corner of the rectangular window, if it is empty, the center of the screen window is located
turtle.fd(x)	Brush along the current direction of advance x (sign)
turtle.bk(x)	To move the pen (a, b), the current direction is not changed
turtle.goto(a,b)	To move the pen (a, b), the current direction is not changed
turtle.circle(r,angle)	Brush radius r, counterclockwise rotation angle (plus or minus) of
turtle.setth (angle) (absolute angle)	Change the direction of the current brush, but does not travel
turtle.left (angle) (the angle turtles)	The current direction of the left angle of the brush
turtle.right (angle) (the angle turtles)	Turn right direction angle of the current brush
turtle.colormode(mode)	1.0RGB fractional mode (general); 255RGB integer numerical model
turtle.penup()	Lift the brush
turtle.pendown()	Brush down
turtle.pensize(a)	Set the brush size of a pixel
turtle.pencolor(“red”)	Set the brush color to red (other)
turtle.begin_fill()	Ready to start filling graphics
turtle.end_fill()	The filling is completed
turtle.fillcolor (color string)	Draw fill color graphics
turtle.hideturtle()	Hide arrows show
turtle.showturtle()	Arrow display
turtle.done()	Paint the end

　　　　 Pen color can be expressed in a variety of forms:

Color string: turtle.pencolor ( "purple")

　　 Small RGB values: turtle.pencolor (0.63, 0.13, 0.94 )
　　 integer RGB values: turtle.pencolor (160, 32, 240 )

Tuple RGB values: turtle.pencolor ((0.63, 0.13, 0.94))

Common RGB color　　　　　

Chinese name	String	RGB integer values	RGB decimal values
white	white	255, 255, 255	1, 1, 1
yellow	yellow	255, 255, 0	1, 1, 0
Magenta	magenta	255, 0, 255	1, 0, 1
Blue color	cyan	0, 255, 255	0, 1, 1
blue	blue	0, 0, 255	0, 0, 1
black	black	0, 0, 1	0, 0, 0
Colored seashells	seashell	255, 245, 238	1, 0.96, 0.93
Golden	gold	255, 215, 0	1, 0.84, 0
Pink	pink	255, 192, 203	1, 0.75, 0.80
brown	brown	165, 42, 42	0.65, 0.16, 0.16
purple	purple	160, 32, 240	0.63, 0.13, 0.94
Tomato color	tomato	255, 99, 71	1, 0.39, 0.28

Drawing examples

Superimposed equilateral triangle

 1 import turtle as t
 2 
 3 def drawTriangle(angle, long):
 4     for i in range(3):
 5         t.fd(long)
 6         t.left(angle)
 7 
 8 if __name__ == "__main__":
 9     t.pensize(3)
10     t.seth(-120)
11     drawTriangle(120, 100)
12     for i in range(2):
13         t.fd(200)
14         t.left(120)
15     t.fd(100)
16     t.left(120)
17     t.fd(100)
18     t.right(120)
19     t.fd(100)
20     t.hideturtle()
21     t.done()

六角形

import turtle as t

def drawSixangle(angle, long):
    for i in range(5):
        t.fd(long)
        t.right(angle)

def drawTriangle(angle1, angle2, long):
    for i in range(6):
        t.fd(long)
        t.right(angle1)
        t.fd(long)
        t.left(angle2)

if __name__ == "__main__":
    t.pensize(2)
    t.seth(30)
    drawSixangle(60, 100)
    t.fd(100)
    drawTriangle(120, 60, 100)
    t.done()

五角星

 1 import turtle as t
 2 
 3 def main(long, angle):
 4     for i in range(5):
 5         t.fd(long)
 6         t.right(angle)
 7 
 8 if __name__ == "__main__":
 9     t.begin_fill()
10     t.fillcolor('red')
11     t.pensize(1)
12     main(100, 144)
13     t.end_fill()
14     t.hideturtle()
15     t.done()

Learning Python's turtle library (a)

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