24.1. turtle — Gráficos Turtle

Código Fonte: Lib/turtle.py

24.1.1. Introdução

Turtle graphics é uma maneira popular para a introdução de programação para crianças. Era parte da linguagem de programação do logotipo original desenvolvida por Wally Feurzig e Seymour Papert em 1966.

Imagine uma tartaruga robótica começando em (0, 0) no plano x-y. Depois de um “import turtle”, dê-lhe o comando turtle.forward(15), e mova (na tela!) 15 pixels na direção em que está virada, desenhando uma linha à medida que ela se move. Digite o comando turtle.right(25), e gire-a no lugar 25 graus no sentido horário.

Turtle star

A tartaruga pode desenhar formas intrincadas usando programas que repetem movimentos simples.

../_images/turtle-star.png 
from turtle import *
color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()
done()

Ao combinar esses comandos similares, formas intrincadas e imagens podem ser desenhadas facilmente.

O módulo turtle é uma re-implementação extendida de um módulo de mesmo nome da distribuição padrão do Python até a versão Python 2.5.

Ele tenta manter os valores do antigo módulo turtle e ser (quase) 100% compatível com ele. Isso significa, em primeiro lugar, permitir que o programador aprendiz use todos os comandos, classes e métodos interativamente ao usar o módulo de dentro do IDLE executado com a chave -n.

O módulo turtle fornece gráficos rudimentares, tanto para programação orientada a objetos quanto procedural. Como ele usa o tkinter como módulo gráfico, ele necessita de uma versão do instalada do Python que suporta o Tk.

A interface orientada a objetos usa essencialmente duas classes (e duas sub-classes):

  1. The TurtleScreen class defines graphics windows as a playground for the drawing turtles. Its constructor needs a tkinter.Canvas or a ScrolledCanvas as argument. It should be used when turtle is used as part of some application.

    The function Screen() returns a singleton object of a TurtleScreen subclass. This function should be used when turtle is used as a standalone tool for doing graphics. As a singleton object, inheriting from its class is not possible.

    All methods of TurtleScreen/Screen also exist as functions, i.e. as part of the procedure-oriented interface.

  2. RawTurtle (alias: RawPen) defines Turtle objects which draw on a TurtleScreen. Its constructor needs a Canvas, ScrolledCanvas or TurtleScreen as argument, so the RawTurtle objects know where to draw.

    Derived from RawTurtle is the subclass Turtle (alias: Pen), which draws on “the” Screen instance which is automatically created, if not already present.

    Todos os métodos de RawTurtle/Turtle também existem como funções, isto é, parte de uma interface procedural orientada à objeto.

The procedural interface provides functions which are derived from the methods of the classes Screen and Turtle. They have the same names as the corresponding methods. A screen object is automatically created whenever a function derived from a Screen method is called. An (unnamed) turtle object is automatically created whenever any of the functions derived from a Turtle method is called.

To use multiple turtles on a screen one has to use the object-oriented interface.

Nota

In the following documentation the argument list for functions is given. Methods, of course, have the additional first argument self which is omitted here.

24.1.2. Overview of available Turtle and Screen methods

24.1.2.2. Métodos de TurtleScreen/Screen

Controle da Janela
bgcolor()
bgpic()
clear() | clearscreen()
reset() | resetscreen()
screensize()
setworldcoordinates()
Controle da Animação
delay()
tracer()
update()
Usando os Eventos de Tela
listen()
onkey() | onkeyrelease()
onkeypress()
onclick() | onscreenclick()
ontimer()
mainloop() | done()
Configurações e Métodos Especiais
mode()
colormode()
getcanvas()
getshapes()
register_shape() | addshape()
turtles()
window_height()
window_width()
Métodos de Entrada
textinput()
numinput()
Métodos Específicos para Tela
bye()
exitonclick()
setup()
title()

24.1.3. Métodos de RawTurtle/Turtle e funções correspondentes

A maioria dos exemplos desta seção referem-se a uma ocorrência Tartaruga chamada turtle.

24.1.3.1. Movimentos do Turtle

turtle.forward(distance)
turtle.fd(distance)
Parâmetros

distance – a number (integer or float)

Move the turtle forward by the specified distance, in the direction the turtle is headed.

>>> turtle.position()
(0.00,0.00)
>>> turtle.forward(25)
>>> turtle.position()
(25.00,0.00)
>>> turtle.forward(-75)
>>> turtle.position()
(-50.00,0.00)
turtle.back(distance)
turtle.bk(distance)
turtle.backward(distance)
Parâmetros

distance – um número

Move the turtle backward by distance, opposite to the direction the turtle is headed. Do not change the turtle’s heading.

>>> turtle.position()
(0.00,0.00)
>>> turtle.backward(30)
>>> turtle.position()
(-30.00,0.00)
turtle.right(angle)
turtle.rt(angle)
Parâmetros

angle – a number (integer or float)

Turn turtle right by angle units. (Units are by default degrees, but can be set via the degrees() and radians() functions.) Angle orientation depends on the turtle mode, see mode().

>>> turtle.heading()
22.0
>>> turtle.right(45)
>>> turtle.heading()
337.0
turtle.left(angle)
turtle.lt(angle)
Parâmetros

angle – a number (integer or float)

Turn turtle left by angle units. (Units are by default degrees, but can be set via the degrees() and radians() functions.) Angle orientation depends on the turtle mode, see mode().

>>> turtle.heading()
22.0
>>> turtle.left(45)
>>> turtle.heading()
67.0
turtle.goto(x, y=None)
turtle.setpos(x, y=None)
turtle.setposition(x, y=None)
Parâmetros

  • x – um número ou um par/arrays de números

  • y – um número ou None

Se y for None, x deve ser um par de coordenadas ou uma classe Vec2D (por exemplo, como retornado pela função pos()).

Move a tartaruga para uma posição absoluta. Caso a caneta esteja baixa, trace a linha. Não altera a orientação da tartaruga.

>>> tp = turtle.pos()
>>> tp
(0.00,0.00)
>>> turtle.setpos(60,30)
>>> turtle.pos()
(60.00,30.00)
>>> turtle.setpos((20,80))
>>> turtle.pos()
(20.00,80.00)
>>> turtle.setpos(tp)
>>> turtle.pos()
(0.00,0.00)
turtle.setx(x)
Parâmetros

x – a number (integer or float)

Define a primeira coordenada da tartaruga para x, deixa a segunda coordenada inalterada.

>>> turtle.position()
(0.00,240.00)
>>> turtle.setx(10)
>>> turtle.position()
(10.00,240.00)
turtle.sety(y)
Parâmetros

y – a number (integer or float)

Defina a segunda coordenada da tartaruga para y, deixa a primeira coordenada inalterada.

>>> turtle.position()
(0.00,40.00)
>>> turtle.sety(-10)
>>> turtle.position()
(0.00,-10.00)
turtle.setheading(to_angle)
turtle.seth(to_angle)
Parâmetros

to_angle – a number (integer or float)

Determine a orientação da tartaruga para to_angle. Aqui estão algumas direções mais comuns em graus:

modo padrão

logo mode

0 - leste

0 - norte

90 - norte

90 - leste

180 - oeste

180 - sul

270 - sul

270 - oeste

 
>>> turtle.setheading(90)
>>> turtle.heading()
90.0
turtle.home()

Move turtle to the origin – coordinates (0,0) – and set its heading to its start-orientation (which depends on the mode, see mode()).

>>> turtle.heading()
90.0
>>> turtle.position()
(0.00,-10.00)
>>> turtle.home()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
turtle.circle(radius, extent=None, steps=None)
Parâmetros

  • radius – um número

  • extent – um número (ou None)

  • steps – an integer (or None)

Draw a circle with given radius. The center is radius units left of the turtle; extent – an angle – determines which part of the circle is drawn. If extent is not given, draw the entire circle. If extent is not a full circle, one endpoint of the arc is the current pen position. Draw the arc in counterclockwise direction if radius is positive, otherwise in clockwise direction. Finally the direction of the turtle is changed by the amount of extent.

As the circle is approximated by an inscribed regular polygon, steps determines the number of steps to use. If not given, it will be calculated automatically. May be used to draw regular polygons.

>>> turtle.home()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
>>> turtle.circle(50)
>>> turtle.position()
(-0.00,0.00)
>>> turtle.heading()
0.0
>>> turtle.circle(120, 180)  # draw a semicircle
>>> turtle.position()
(0.00,240.00)
>>> turtle.heading()
180.0
turtle.dot(size=None, *color)
Parâmetros

  • size – um número >= 1 (caso seja fornecido)

  • color – uma String de cores ou uma tupla de cores numéricas

Draw a circular dot with diameter size, using color. If size is not given, the maximum of pensize+4 and 2*pensize is used.

>>> turtle.home()
>>> turtle.dot()
>>> turtle.fd(50); turtle.dot(20, "blue"); turtle.fd(50)
>>> turtle.position()
(100.00,-0.00)
>>> turtle.heading()
0.0
turtle.stamp()

Stamp a copy of the turtle shape onto the canvas at the current turtle position. Return a stamp_id for that stamp, which can be used to delete it by calling clearstamp(stamp_id).

>>> turtle.color("blue")
>>> turtle.stamp()
11
>>> turtle.fd(50)
turtle.clearstamp(stampid)
Parâmetros

stampid – an integer, must be return value of previous stamp() call

Delete stamp with given stampid.

>>> turtle.position()
(150.00,-0.00)
>>> turtle.color("blue")
>>> astamp = turtle.stamp()
>>> turtle.fd(50)
>>> turtle.position()
(200.00,-0.00)
>>> turtle.clearstamp(astamp)
>>> turtle.position()
(200.00,-0.00)
turtle.clearstamps(n=None)
Parâmetros

n – an integer (or None)

Delete all or first/last n of turtle’s stamps. If n is None, delete all stamps, if n > 0 delete first n stamps, else if n < 0 delete last n stamps.

>>> for i in range(8):
...     turtle.stamp(); turtle.fd(30)
13
14
15
16
17
18
19
20
>>> turtle.clearstamps(2)
>>> turtle.clearstamps(-2)
>>> turtle.clearstamps()
turtle.undo()

Undo (repeatedly) the last turtle action(s). Number of available undo actions is determined by the size of the undobuffer.

>>> for i in range(4):
...     turtle.fd(50); turtle.lt(80)
...
>>> for i in range(8):
...     turtle.undo()
turtle.speed(speed=None)
Parâmetros

speed – an integer in the range 0..10 or a speedstring (see below)

Set the turtle’s speed to an integer value in the range 0..10. If no argument is given, return current speed.

If input is a number greater than 10 or smaller than 0.5, speed is set to 0. Speedstrings are mapped to speedvalues as follows:

  • “fastest”: 0

  • “fast”: 10

  • “normal”: 6

  • “slow”: 3

  • “slowest”: 1

Velocidades de 1 a 10 tornam a animação cada vez mais rápida, tanto para o desenho da linha como para a rotação da tartaruga.

Attention: speed = 0 means that no animation takes place. forward/back makes turtle jump and likewise left/right make the turtle turn instantly.

>>> turtle.speed()
3
>>> turtle.speed('normal')
>>> turtle.speed()
6
>>> turtle.speed(9)
>>> turtle.speed()
9

24.1.3.2. Fala o Estado da Tartaruga

turtle.position()
turtle.pos()

Return the turtle’s current location (x,y) (as a Vec2D vector).

>>> turtle.pos()
(440.00,-0.00)
turtle.towards(x, y=None)
Parâmetros

  • x – um número ou um par/vetor de números ou uma instância de tartaruga

  • y – um número caso x seja um número, senão None

Return the angle between the line from turtle position to position specified by (x,y), the vector or the other turtle. This depends on the turtle’s start orientation which depends on the mode - “standard”/”world” or “logo”).

>>> turtle.goto(10, 10)
>>> turtle.towards(0,0)
225.0
turtle.xcor()

Retorna a coordenada X da tartaruga.

>>> turtle.home()
>>> turtle.left(50)
>>> turtle.forward(100)
>>> turtle.pos()
(64.28,76.60)
>>> print(round(turtle.xcor(), 5))
64.27876
turtle.ycor()

Retorna a coordenada Y da tartaruga

>>> turtle.home()
>>> turtle.left(60)
>>> turtle.forward(100)
>>> print(turtle.pos())
(50.00,86.60)
>>> print(round(turtle.ycor(), 5))
86.60254
turtle.heading()

Return the turtle’s current heading (value depends on the turtle mode, see mode()).

>>> turtle.home()
>>> turtle.left(67)
>>> turtle.heading()
67.0
turtle.distance(x, y=None)
Parâmetros

  • x – um número ou um par/vetor de números ou uma instância de tartaruga

  • y – um número caso x seja um número, senão None

Return the distance from the turtle to (x,y), the given vector, or the given other turtle, in turtle step units.

>>> turtle.home()
>>> turtle.distance(30,40)
50.0
>>> turtle.distance((30,40))
50.0
>>> joe = Turtle()
>>> joe.forward(77)
>>> turtle.distance(joe)
77.0

24.1.3.3. Configurações de Medida

turtle.degrees(fullcircle=360.0)
Parâmetros

fullcircle – um número

Set angle measurement units, i.e. set number of “degrees” for a full circle. Default value is 360 degrees.

>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0

Change angle measurement unit to grad (also known as gon,
grade, or gradian and equals 1/100-th of the right angle.)
>>> turtle.degrees(400.0)
>>> turtle.heading()
100.0
>>> turtle.degrees(360)
>>> turtle.heading()
90.0
turtle.radians()

Set the angle measurement units to radians. Equivalent to degrees(2*math.pi).

>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0
>>> turtle.radians()
>>> turtle.heading()
1.5707963267948966

24.1.3.4. Controle da Caneta

24.1.3.4.1. Estado do Desenho

turtle.pendown()
turtle.pd()
turtle.down()

Pull the pen down – drawing when moving.

turtle.penup()
turtle.pu()
turtle.up()

Pull the pen up – no drawing when moving.

turtle.pensize(width=None)
turtle.width(width=None)
Parâmetros

width – um número positivo

Set the line thickness to width or return it. If resizemode is set to “auto” and turtleshape is a polygon, that polygon is drawn with the same line thickness. If no argument is given, the current pensize is returned.

>>> turtle.pensize()
1
>>> turtle.pensize(10)   # from here on lines of width 10 are drawn
turtle.pen(pen=None, **pendict)
Parâmetros

  • pen – a dictionary with some or all of the below listed keys

  • pendict – one or more keyword-arguments with the below listed keys as keywords

Return or set the pen’s attributes in a “pen-dictionary” with the following key/value pairs:

  • “shown”: True/False

  • “pendown”: True/False

  • “pencolor”: color-string or color-tuple

  • “fillcolor”: color-string or color-tuple

  • “pensize”: positive number

  • “speed”: number in range 0..10

  • “resizemode”: “auto” or “user” or “noresize”

  • “stretchfactor”: (positive number, positive number)

  • “outline”: positive number

  • “tilt”: number

This dictionary can be used as argument for a subsequent call to pen() to restore the former pen-state. Moreover one or more of these attributes can be provided as keyword-arguments. This can be used to set several pen attributes in one statement.

>>> turtle.pen(fillcolor="black", pencolor="red", pensize=10)
>>> sorted(turtle.pen().items())
[('fillcolor', 'black'), ('outline', 1), ('pencolor', 'red'),
 ('pendown', True), ('pensize', 10), ('resizemode', 'noresize'),
 ('shearfactor', 0.0), ('shown', True), ('speed', 9),
 ('stretchfactor', (1.0, 1.0)), ('tilt', 0.0)]
>>> penstate=turtle.pen()
>>> turtle.color("yellow", "")
>>> turtle.penup()
>>> sorted(turtle.pen().items())[:3]
[('fillcolor', ''), ('outline', 1), ('pencolor', 'yellow')]
>>> turtle.pen(penstate, fillcolor="green")
>>> sorted(turtle.pen().items())[:3]
[('fillcolor', 'green'), ('outline', 1), ('pencolor', 'red')]
turtle.isdown()

Retorna True se a caneta estiver baixa, False se estiver feito.

>>> turtle.penup()
>>> turtle.isdown()
False
>>> turtle.pendown()
>>> turtle.isdown()
True

24.1.3.4.2. Controle da Cor

turtle.pencolor(*args)

Retorna ou define o pencolor.

São permitidos quatro formatos de entrada:

pencolor()

Return the current pencolor as color specification string or as a tuple (see example). May be used as input to another color/pencolor/fillcolor call.

pencolor(colorstring)

Set pencolor to colorstring, which is a Tk color specification string, such as "red", "yellow", or "#33cc8c".

pencolor((r, g, b))

Set pencolor to the RGB color represented by the tuple of r, g, and b. Each of r, g, and b must be in the range 0..colormode, where colormode is either 1.0 or 255 (see colormode()).

pencolor(r, g, b)

Set pencolor to the RGB color represented by r, g, and b. Each of r, g, and b must be in the range 0..colormode.

If turtleshape is a polygon, the outline of that polygon is drawn with the newly set pencolor.

>>> colormode()
1.0
>>> turtle.pencolor()
'red'
>>> turtle.pencolor("brown")
>>> turtle.pencolor()
'brown'
>>> tup = (0.2, 0.8, 0.55)
>>> turtle.pencolor(tup)
>>> turtle.pencolor()
(0.2, 0.8, 0.5490196078431373)
>>> colormode(255)
>>> turtle.pencolor()
(51.0, 204.0, 140.0)
>>> turtle.pencolor('#32c18f')
>>> turtle.pencolor()
(50.0, 193.0, 143.0)
turtle.fillcolor(*args)

Retorna ou define o fillcolor.

São permitidos quatro formatos de entrada:

fillcolor()

Return the current fillcolor as color specification string, possibly in tuple format (see example). May be used as input to another color/pencolor/fillcolor call.

fillcolor(colorstring)

Set fillcolor to colorstring, which is a Tk color specification string, such as "red", "yellow", or "#33cc8c".

fillcolor((r, g, b))

Set fillcolor to the RGB color represented by the tuple of r, g, and b. Each of r, g, and b must be in the range 0..colormode, where colormode is either 1.0 or 255 (see colormode()).

fillcolor(r, g, b)

Set fillcolor to the RGB color represented by r, g, and b. Each of r, g, and b must be in the range 0..colormode.

If turtleshape is a polygon, the interior of that polygon is drawn with the newly set fillcolor.

>>> turtle.fillcolor("violet")
>>> turtle.fillcolor()
'violet'
>>> col = turtle.pencolor()
>>> col
(50.0, 193.0, 143.0)
>>> turtle.fillcolor(col)
>>> turtle.fillcolor()
(50.0, 193.0, 143.0)
>>> turtle.fillcolor('#ffffff')
>>> turtle.fillcolor()
(255.0, 255.0, 255.0)
turtle.color(*args)

Return or set pencolor and fillcolor.

Several input formats are allowed. They use 0 to 3 arguments as follows:

color()

Return the current pencolor and the current fillcolor as a pair of color specification strings or tuples as returned by pencolor() and fillcolor().

color(colorstring), color((r,g,b)), color(r,g,b)

Inputs as in pencolor(), set both, fillcolor and pencolor, to the given value.

color(colorstring1, colorstring2), color((r1,g1,b1), (r2,g2,b2))

Equivalent to pencolor(colorstring1) and fillcolor(colorstring2) and analogously if the other input format is used.

If turtleshape is a polygon, outline and interior of that polygon is drawn with the newly set colors.

>>> turtle.color("red", "green")
>>> turtle.color()
('red', 'green')
>>> color("#285078", "#a0c8f0")
>>> color()
((40.0, 80.0, 120.0), (160.0, 200.0, 240.0))

Veja também: Método da tela colormode().

24.1.3.4.3. Preenchimento

turtle.filling()

Retorna fillstate (True se estiver preenchido, False caso contrário).

>>> turtle.begin_fill()
>>> if turtle.filling():
...    turtle.pensize(5)
... else:
...    turtle.pensize(3)
turtle.begin_fill()

To be called just before drawing a shape to be filled.

turtle.end_fill()

Fill the shape drawn after the last call to begin_fill().

>>> turtle.color("black", "red")
>>> turtle.begin_fill()
>>> turtle.circle(80)
>>> turtle.end_fill()

24.1.3.4.4. Mais sobre o Controle do Desenho

turtle.reset()

Delete the turtle’s drawings from the screen, re-center the turtle and set variables to the default values.

>>> turtle.goto(0,-22)
>>> turtle.left(100)
>>> turtle.position()
(0.00,-22.00)
>>> turtle.heading()
100.0
>>> turtle.reset()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
turtle.clear()

Delete the turtle’s drawings from the screen. Do not move turtle. State and position of the turtle as well as drawings of other turtles are not affected.

turtle.write(arg, move=False, align="left", font=("Arial", 8, "normal"))
Parâmetros

  • arg – object to be written to the TurtleScreen

  • move – True/False

  • align – uma das Strings “left”, “center” ou right”

  • font – a triple (fontname, fontsize, fonttype)

Write text - the string representation of arg - at the current turtle position according to align (“left”, “center” or right”) and with the given font. If move is true, the pen is moved to the bottom-right corner of the text. By default, move is False.

>>> turtle.write("Home = ", True, align="center")
>>> turtle.write((0,0), True)

24.1.3.5. Estado da Tartaruga

24.1.3.5.1. Visibilidade

turtle.hideturtle()
turtle.ht()

Make the turtle invisible. It’s a good idea to do this while you’re in the middle of doing some complex drawing, because hiding the turtle speeds up the drawing observably.

>>> turtle.hideturtle()
turtle.showturtle()
turtle.st()

Tornar a tartaruga visível.

>>> turtle.showturtle()
turtle.isvisible()

Return True if the Turtle is shown, False if it’s hidden.

>>> turtle.hideturtle()
>>> turtle.isvisible()
False
>>> turtle.showturtle()
>>> turtle.isvisible()
True

24.1.3.5.2. Aparência

turtle.shape(name=None)
Parâmetros

name – a string which is a valid shapename

Set turtle shape to shape with given name or, if name is not given, return name of current shape. Shape with name must exist in the TurtleScreen’s shape dictionary. Initially there are the following polygon shapes: “arrow”, “turtle”, “circle”, “square”, “triangle”, “classic”. To learn about how to deal with shapes see Screen method register_shape().

>>> turtle.shape()
'classic'
>>> turtle.shape("turtle")
>>> turtle.shape()
'turtle'
turtle.resizemode(rmode=None)
Parâmetros

rmode – one of the strings “auto”, “user”, “noresize”

Set resizemode to one of the values: “auto”, “user”, “noresize”. If rmode is not given, return current resizemode. Different resizemodes have the following effects:

  • “auto”: adapts the appearance of the turtle corresponding to the value of pensize.

  • “user”: adapts the appearance of the turtle according to the values of stretchfactor and outlinewidth (outline), which are set by shapesize().

  • “noresize”: no adaption of the turtle’s appearance takes place.

resizemode(“user”) is called by shapesize() when used with arguments.

>>> turtle.resizemode()
'noresize'
>>> turtle.resizemode("auto")
>>> turtle.resizemode()
'auto'
turtle.shapesize(stretch_wid=None, stretch_len=None, outline=None)
turtle.turtlesize(stretch_wid=None, stretch_len=None, outline=None)
Parâmetros

  • stretch_wid – número positivo

  • stretch_len – número positivo

  • outline – número positivo

Return or set the pen’s attributes x/y-stretchfactors and/or outline. Set resizemode to “user”. If and only if resizemode is set to “user”, the turtle will be displayed stretched according to its stretchfactors: stretch_wid is stretchfactor perpendicular to its orientation, stretch_len is stretchfactor in direction of its orientation, outline determines the width of the shapes’s outline.

>>> turtle.shapesize()
(1.0, 1.0, 1)
>>> turtle.resizemode("user")
>>> turtle.shapesize(5, 5, 12)
>>> turtle.shapesize()
(5, 5, 12)
>>> turtle.shapesize(outline=8)
>>> turtle.shapesize()
(5, 5, 8)
turtle.shearfactor(shear=None)
Parâmetros

shear – número (optional)

Set or return the current shearfactor. Shear the turtleshape according to the given shearfactor shear, which is the tangent of the shear angle. Do not change the turtle’s heading (direction of movement). If shear is not given: return the current shearfactor, i. e. the tangent of the shear angle, by which lines parallel to the heading of the turtle are sheared.

>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.shearfactor(0.5)
>>> turtle.shearfactor()
0.5
turtle.tilt(angle)
Parâmetros

angle – um número

Rotate the turtleshape by angle from its current tilt-angle, but do not change the turtle’s heading (direction of movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(30)
>>> turtle.fd(50)
>>> turtle.tilt(30)
>>> turtle.fd(50)
turtle.settiltangle(angle)
Parâmetros

angle – um número

Rotate the turtleshape to point in the direction specified by angle, regardless of its current tilt-angle. Do not change the turtle’s heading (direction of movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.settiltangle(45)
>>> turtle.fd(50)
>>> turtle.settiltangle(-45)
>>> turtle.fd(50)

Obsoleto desde a versão 3.1.

turtle.tiltangle(angle=None)
Parâmetros

angle – um número (optional)

Set or return the current tilt-angle. If angle is given, rotate the turtleshape to point in the direction specified by angle, regardless of its current tilt-angle. Do not change the turtle’s heading (direction of movement). If angle is not given: return the current tilt-angle, i. e. the angle between the orientation of the turtleshape and the heading of the turtle (its direction of movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(45)
>>> turtle.tiltangle()
45.0
turtle.shapetransform(t11=None, t12=None, t21=None, t22=None)
Parâmetros

  • t11 – um número (optional)

  • t12 – um número (optional)

  • t21 – um número (optional)

  • t12 – um número (optional)

Set or return the current transformation matrix of the turtle shape.

If none of the matrix elements are given, return the transformation matrix as a tuple of 4 elements. Otherwise set the given elements and transform the turtleshape according to the matrix consisting of first row t11, t12 and second row t21, 22. The determinant t11 * t22 - t12 * t21 must not be zero, otherwise an error is raised. Modify stretchfactor, shearfactor and tiltangle according to the given matrix.

>>> turtle = Turtle()
>>> turtle.shape("square")
>>> turtle.shapesize(4,2)
>>> turtle.shearfactor(-0.5)
>>> turtle.shapetransform()
(4.0, -1.0, -0.0, 2.0)
turtle.get_shapepoly()

Return the current shape polygon as tuple of coordinate pairs. This can be used to define a new shape or components of a compound shape.

>>> turtle.shape("square")
>>> turtle.shapetransform(4, -1, 0, 2)
>>> turtle.get_shapepoly()
((50, -20), (30, 20), (-50, 20), (-30, -20))

24.1.3.6. Eventos Utilizados

turtle.onclick(fun, btn=1, add=None)
Parâmetros

  • fun – a function with two arguments which will be called with the coordinates of the clicked point on the canvas

  • btn – number of the mouse-button, defaults to 1 (left mouse button)

  • add – True or False – if True, a new binding will be added, otherwise it will replace a former binding

Bind fun to mouse-click events on this turtle. If fun is None, existing bindings are removed. Example for the anonymous turtle, i.e. the procedural way:

>>> def turn(x, y):
...     left(180)
...
>>> onclick(turn)  # Now clicking into the turtle will turn it.
>>> onclick(None)  # event-binding will be removed
turtle.onrelease(fun, btn=1, add=None)
Parâmetros

  • fun – a function with two arguments which will be called with the coordinates of the clicked point on the canvas

  • btn – number of the mouse-button, defaults to 1 (left mouse button)

  • add – True or False – if True, a new binding will be added, otherwise it will replace a former binding

Bind fun to mouse-button-release events on this turtle. If fun is None, existing bindings are removed.

>>> class MyTurtle(Turtle):
...     def glow(self,x,y):
...         self.fillcolor("red")
...     def unglow(self,x,y):
...         self.fillcolor("")
...
>>> turtle = MyTurtle()
>>> turtle.onclick(turtle.glow)     # clicking on turtle turns fillcolor red,
>>> turtle.onrelease(turtle.unglow) # releasing turns it to transparent.
turtle.ondrag(fun, btn=1, add=None)
Parâmetros

  • fun – a function with two arguments which will be called with the coordinates of the clicked point on the canvas

  • btn – number of the mouse-button, defaults to 1 (left mouse button)

  • add – True or False – if True, a new binding will be added, otherwise it will replace a former binding

Bind fun to mouse-move events on this turtle. If fun is None, existing bindings are removed.

Remark: Every sequence of mouse-move-events on a turtle is preceded by a mouse-click event on that turtle.

>>> turtle.ondrag(turtle.goto)

Subsequently, clicking and dragging the Turtle will move it across the screen thereby producing handdrawings (if pen is down).

24.1.3.7. Métodos Especiais da Tartaruga

turtle.begin_poly()

Start recording the vertices of a polygon. Current turtle position is first vertex of polygon.

turtle.end_poly()

Stop recording the vertices of a polygon. Current turtle position is last vertex of polygon. This will be connected with the first vertex.

turtle.get_poly()

Return the last recorded polygon.

>>> turtle.home()
>>> turtle.begin_poly()
>>> turtle.fd(100)
>>> turtle.left(20)
>>> turtle.fd(30)
>>> turtle.left(60)
>>> turtle.fd(50)
>>> turtle.end_poly()
>>> p = turtle.get_poly()
>>> register_shape("myFavouriteShape", p)
turtle.clone()

Create and return a clone of the turtle with same position, heading and turtle properties.

>>> mick = Turtle()
>>> joe = mick.clone()
turtle.getturtle()
turtle.getpen()

Return the Turtle object itself. Only reasonable use: as a function to return the “anonymous turtle”:

>>> pet = getturtle()
>>> pet.fd(50)
>>> pet
<turtle.Turtle object at 0x...>
turtle.getscreen()

Return the TurtleScreen object the turtle is drawing on. TurtleScreen methods can then be called for that object.

>>> ts = turtle.getscreen()
>>> ts
<turtle._Screen object at 0x...>
>>> ts.bgcolor("pink")
turtle.setundobuffer(size)
Parâmetros

size – um inteiro ou None

Set or disable undobuffer. If size is an integer an empty undobuffer of given size is installed. size gives the maximum number of turtle actions that can be undone by the undo() method/function. If size is None, the undobuffer is disabled.

>>> turtle.setundobuffer(42)
turtle.undobufferentries()

Return number of entries in the undobuffer.

>>> while undobufferentries():
...     undo()

24.1.3.8. Formas compostas

To use compound turtle shapes, which consist of several polygons of different color, you must use the helper class Shape explicitly as described below:

  1. Create an empty Shape object of type “compound”.

  2. Add as many components to this object as desired, using the addcomponent() method.

    Por exemplo:

    >>> s = Shape("compound")
>>> poly1 = ((0,0),(10,-5),(0,10),(-10,-5))
>>> s.addcomponent(poly1, "red", "blue")
>>> poly2 = ((0,0),(10,-5),(-10,-5))
>>> s.addcomponent(poly2, "blue", "red")

  3. Now add the Shape to the Screen’s shapelist and use it:

    >>> register_shape("myshape", s)
>>> shape("myshape")

Nota

The Shape class is used internally by the register_shape() method in different ways. The application programmer has to deal with the Shape class only when using compound shapes like shown above!

24.1.4. Methods of TurtleScreen/Screen and corresponding functions

Most of the examples in this section refer to a TurtleScreen instance called screen.

24.1.4.1. Controle da Janela

turtle.bgcolor(*args)
Parâmetros

args – a color string or three numbers in the range 0..colormode or a 3-tuple of such numbers

Set or return background color of the TurtleScreen.

>>> screen.bgcolor("orange")
>>> screen.bgcolor()
'orange'
>>> screen.bgcolor("#800080")
>>> screen.bgcolor()
(128.0, 0.0, 128.0)
turtle.bgpic(picname=None)
Parâmetros

picname – a string, name of a gif-file or "nopic", or None

Set background image or return name of current backgroundimage. If picname is a filename, set the corresponding image as background. If picname is "nopic", delete background image, if present. If picname is None, return the filename of the current backgroundimage.

>>> screen.bgpic()
'nopic'
>>> screen.bgpic("landscape.gif")
>>> screen.bgpic()
"landscape.gif"
turtle.clear()
turtle.clearscreen()

Delete all drawings and all turtles from the TurtleScreen. Reset the now empty TurtleScreen to its initial state: white background, no background image, no event bindings and tracing on.

Nota

This TurtleScreen method is available as a global function only under the name clearscreen. The global function clear is a different one derived from the Turtle method clear.

turtle.reset()
turtle.resetscreen()

Reset all Turtles on the Screen to their initial state.

Nota

This TurtleScreen method is available as a global function only under the name resetscreen. The global function reset is another one derived from the Turtle method reset.

turtle.screensize(canvwidth=None, canvheight=None, bg=None)
Parâmetros

  • canvwidth – positive integer, new width of canvas in pixels

  • canvheight – positive integer, new height of canvas in pixels

  • bg – colorstring or color-tuple, new background color

If no arguments are given, return current (canvaswidth, canvasheight). Else resize the canvas the turtles are drawing on. Do not alter the drawing window. To observe hidden parts of the canvas, use the scrollbars. With this method, one can make visible those parts of a drawing which were outside the canvas before.

>>> screen.screensize()
(400, 300)
>>> screen.screensize(2000,1500)
>>> screen.screensize()
(2000, 1500)

e.g. to search for an erroneously escaped turtle ;-)

turtle.setworldcoordinates(llx, lly, urx, ury)
Parâmetros

  • llx – a number, x-coordinate of lower left corner of canvas

  • lly – a number, y-coordinate of lower left corner of canvas

  • urx – a number, x-coordinate of upper right corner of canvas

  • ury – a number, y-coordinate of upper right corner of canvas

Set up user-defined coordinate system and switch to mode “world” if necessary. This performs a screen.reset(). If mode “world” is already active, all drawings are redrawn according to the new coordinates.

ATTENTION: in user-defined coordinate systems angles may appear distorted.

>>> screen.reset()
>>> screen.setworldcoordinates(-50,-7.5,50,7.5)
>>> for _ in range(72):
...     left(10)
...
>>> for _ in range(8):
...     left(45); fd(2)   # a regular octagon

24.1.4.2. Controle da Animação

turtle.delay(delay=None)
Parâmetros

delay – positive integer

Set or return the drawing delay in milliseconds. (This is approximately the time interval between two consecutive canvas updates.) The longer the drawing delay, the slower the animation.

Argumentos Opcionais:

>>> screen.delay()
10
>>> screen.delay(5)
>>> screen.delay()
5
turtle.tracer(n=None, delay=None)
Parâmetros

  • n – inteiro não-negativo

  • delay – inteiro não-negativo

Turn turtle animation on/off and set delay for update drawings. If n is given, only each n-th regular screen update is really performed. (Can be used to accelerate the drawing of complex graphics.) When called without arguments, returns the currently stored value of n. Second argument sets delay value (see delay()).

>>> screen.tracer(8, 25)
>>> dist = 2
>>> for i in range(200):
...     fd(dist)
...     rt(90)
...     dist += 2
turtle.update()

Perform a TurtleScreen update. To be used when tracer is turned off.

Veja também o método RawTurtle/Turtle speed().

24.1.4.3. Usando os Eventos de Tela

turtle.listen(xdummy=None, ydummy=None)

Set focus on TurtleScreen (in order to collect key-events). Dummy arguments are provided in order to be able to pass listen() to the onclick method.

turtle.onkey(fun, key)
turtle.onkeyrelease(fun, key)
Parâmetros

  • fun – a function with no arguments or None

  • key – a string: key (e.g. “a”) or key-symbol (e.g. “space”)

Bind fun to key-release event of key. If fun is None, event bindings are removed. Remark: in order to be able to register key-events, TurtleScreen must have the focus. (See method listen().)

>>> def f():
...     fd(50)
...     lt(60)
...
>>> screen.onkey(f, "Up")
>>> screen.listen()
turtle.onkeypress(fun, key=None)
Parâmetros

  • fun – a function with no arguments or None

  • key – a string: key (e.g. “a”) or key-symbol (e.g. “space”)

Bind fun to key-press event of key if key is given, or to any key-press-event if no key is given. Remark: in order to be able to register key-events, TurtleScreen must have focus. (See method listen().)

>>> def f():
...     fd(50)
...
>>> screen.onkey(f, "Up")
>>> screen.listen()
turtle.onclick(fun, btn=1, add=None)
turtle.onscreenclick(fun, btn=1, add=None)
Parâmetros

  • fun – a function with two arguments which will be called with the coordinates of the clicked point on the canvas

  • btn – number of the mouse-button, defaults to 1 (left mouse button)

  • add – True or False – if True, a new binding will be added, otherwise it will replace a former binding

Bind fun to mouse-click events on this screen. If fun is None, existing bindings are removed.

Example for a TurtleScreen instance named screen and a Turtle instance named turtle:

>>> screen.onclick(turtle.goto) # Subsequently clicking into the TurtleScreen will
>>>                             # make the turtle move to the clicked point.
>>> screen.onclick(None)        # remove event binding again

Nota

This TurtleScreen method is available as a global function only under the name onscreenclick. The global function onclick is another one derived from the Turtle method onclick.

turtle.ontimer(fun, t=0)
Parâmetros

  • fun – um função sem nenhum argumento

  • t – um número >= 0

Install a timer that calls fun after t milliseconds.

>>> running = True
>>> def f():
...     if running:
...         fd(50)
...         lt(60)
...         screen.ontimer(f, 250)
>>> f()   ### makes the turtle march around
>>> running = False
turtle.mainloop()
turtle.done()

Starts event loop - calling Tkinter’s mainloop function. Must be the last statement in a turtle graphics program. Must not be used if a script is run from within IDLE in -n mode (No subprocess) - for interactive use of turtle graphics.

>>> screen.mainloop()

24.1.4.4. Métodos de Entrada

turtle.textinput(title, prompt)
Parâmetros

  • title – string

  • prompt – string

Pop up a dialog window for input of a string. Parameter title is the title of the dialog window, prompt is a text mostly describing what information to input. Return the string input. If the dialog is canceled, return None.

>>> screen.textinput("NIM", "Name of first player:")
turtle.numinput(title, prompt, default=None, minval=None, maxval=None)
Parâmetros

  • title – string

  • prompt – string

  • default – número (optional)

  • minval – número (optional)

  • maxval – número (optional)

Pop up a dialog window for input of a number. title is the title of the dialog window, prompt is a text mostly describing what numerical information to input. default: default value, minval: minimum value for input, maxval: maximum value for input The number input must be in the range minval .. maxval if these are given. If not, a hint is issued and the dialog remains open for correction. Return the number input. If the dialog is canceled, return None.

>>> screen.numinput("Poker", "Your stakes:", 1000, minval=10, maxval=10000)

24.1.4.5. Configurações e Métodos Especiais

turtle.mode(mode=None)
Parâmetros

mode – one of the strings “standard”, “logo” or “world”

Set turtle mode (“standard”, “logo” or “world”) and perform reset. If mode is not given, current mode is returned.

Mode “standard” is compatible with old turtle. Mode “logo” is compatible with most Logo turtle graphics. Mode “world” uses user-defined “world coordinates”. Attention: in this mode angles appear distorted if x/y unit-ratio doesn’t equal 1.

Modo

Título inicial da tartaruga

ângulos positivos

“standard”

para a direita (east)

counterclockwise

“logo”

upward (north)

clockwise

 
>>> mode("logo")   # resets turtle heading to north
>>> mode()
'logo'
turtle.colormode(cmode=None)
Parâmetros

cmode – um dos valroes 1.0 ou 255

Return the colormode or set it to 1.0 or 255. Subsequently r, g, b values of color triples have to be in the range 0..cmode.

>>> screen.colormode(1)
>>> turtle.pencolor(240, 160, 80)
Traceback (most recent call last):
     ...
TurtleGraphicsError: bad color sequence: (240, 160, 80)
>>> screen.colormode()
1.0
>>> screen.colormode(255)
>>> screen.colormode()
255
>>> turtle.pencolor(240,160,80)
turtle.getcanvas()

Return the Canvas of this TurtleScreen. Useful for insiders who know what to do with a Tkinter Canvas.

>>> cv = screen.getcanvas()
>>> cv
<turtle.ScrolledCanvas object ...>
turtle.getshapes()

Return a list of names of all currently available turtle shapes.

>>> screen.getshapes()
['arrow', 'blank', 'circle', ..., 'turtle']
turtle.register_shape(name, shape=None)
turtle.addshape(name, shape=None)

There are three different ways to call this function:

  1. name is the name of a gif-file and shape is None: Install the corresponding image shape.

    >>> screen.register_shape("turtle.gif")

    Nota

    Image shapes do not rotate when turning the turtle, so they do not display the heading of the turtle!

  2. name is an arbitrary string and shape is a tuple of pairs of coordinates: Install the corresponding polygon shape.

    >>> screen.register_shape("triangle", ((5,-3), (0,5), (-5,-3)))

  3. name is an arbitrary string and shape is a (compound) Shape object: Install the corresponding compound shape.

Add a turtle shape to TurtleScreen’s shapelist. Only thusly registered shapes can be used by issuing the command shape(shapename).

turtle.turtles()

Retorne uma lista de tartarugas na tela.

>>> for turtle in screen.turtles():
...     turtle.color("red")
turtle.window_height()

Retorna a altura da janela da tartaruga.

>>> screen.window_height()
480
turtle.window_width()

Retorna a largura da janela da tartaruga.

>>> screen.window_width()
640

24.1.4.6. Methods specific to Screen, not inherited from TurtleScreen

turtle.bye()

Shut the turtlegraphics window.

turtle.exitonclick()

Bind bye() method to mouse clicks on the Screen.

If the value “using_IDLE” in the configuration dictionary is False (default value), also enter mainloop. Remark: If IDLE with the -n switch (no subprocess) is used, this value should be set to True in turtle.cfg. In this case IDLE’s own mainloop is active also for the client script.

turtle.setup(width=_CFG["width"], height=_CFG["height"], startx=_CFG["leftright"], starty=_CFG["topbottom"])

Set the size and position of the main window. Default values of arguments are stored in the configuration dictionary and can be changed via a turtle.cfg file.

Parâmetros

  • width – if an integer, a size in pixels, if a float, a fraction of the screen; default is 50% of screen

  • height – if an integer, the height in pixels, if a float, a fraction of the screen; default is 75% of screen

  • startx – if positive, starting position in pixels from the left edge of the screen, if negative from the right edge, if None, center window horizontally

  • starty – if positive, starting position in pixels from the top edge of the screen, if negative from the bottom edge, if None, center window vertically

>>> screen.setup (width=200, height=200, startx=0, starty=0)
>>>              # sets window to 200x200 pixels, in upper left of screen
>>> screen.setup(width=.75, height=0.5, startx=None, starty=None)
>>>              # sets window to 75% of screen by 50% of screen and centers
turtle.title(titlestring)
Parâmetros

titlestring – a string that is shown in the titlebar of the turtle graphics window

Set title of turtle window to titlestring.

>>> screen.title("Welcome to the turtle zoo!")

24.1.5. Classes Públicas

class turtle.RawTurtle(canvas)
class turtle.RawPen(canvas)
Parâmetros

canvas – a tkinter.Canvas, a ScrolledCanvas or a TurtleScreen

Create a turtle. The turtle has all methods described above as “methods of Turtle/RawTurtle”.

class turtle.Turtle

Subclass of RawTurtle, has the same interface but draws on a default Screen object created automatically when needed for the first time.

class turtle.TurtleScreen(cv)
Parâmetros

cv – uma tkinter.Canvas

Provides screen oriented methods like setbg() etc. that are described above.

class turtle.Screen

Subclass of TurtleScreen, with four methods added.

class turtle.ScrolledCanvas(master)
Parâmetros

master – some Tkinter widget to contain the ScrolledCanvas, i.e. a Tkinter-canvas with scrollbars added

Used by class Screen, which thus automatically provides a ScrolledCanvas as playground for the turtles.

class turtle.Shape(type_, data)
Parâmetros

type_ – one of the strings “polygon”, “image”, “compound”

Data structure modeling shapes. The pair (type_, data) must follow this specification:

type_

data

“polygon”

a polygon-tuple, i.e. a tuple of pairs of coordinates

“image”

an image (in this form only used internally!)

“compound”

None (a compound shape has to be constructed using the addcomponent() method)
addcomponent(poly, fill, outline=None)
Parâmetros

  • poly – a polygon, i.e. a tuple of pairs of numbers

  • fill – a color the poly will be filled with

  • outline – a color for the poly’s outline (if given)

Exemplo:

>>> poly = ((0,0),(10,-5),(0,10),(-10,-5))
>>> s = Shape("compound")
>>> s.addcomponent(poly, "red", "blue")
>>> # ... add more components and then use register_shape()

See Formas compostas.

class turtle.Vec2D(x, y)

A two-dimensional vector class, used as a helper class for implementing turtle graphics. May be useful for turtle graphics programs too. Derived from tuple, so a vector is a tuple!

Provides (for a, b vectors, k number):

  • a + b vetor adicional

  • a - b subtração de vetor

  • a * b produto interno

  • k * a e a * k multiplicação com escalar

  • abs(a) valor absoluto de um

  • rotação a.rotate(angle)

24.1.6. Ajuda e Configuração

24.1.6.1. Como usar a Ajuda

The public methods of the Screen and Turtle classes are documented extensively via docstrings. So these can be used as online-help via the Python help facilities:

  • When using IDLE, tooltips show the signatures and first lines of the docstrings of typed in function-/method calls.

  • Calling help() on methods or functions displays the docstrings:

    >>> help(Screen.bgcolor)
Help on method bgcolor in module turtle:

bgcolor(self, *args) unbound turtle.Screen method
    Set or return backgroundcolor of the TurtleScreen.

    Arguments (if given): a color string or three numbers
    in the range 0..colormode or a 3-tuple of such numbers.


      >>> screen.bgcolor("orange")
      >>> screen.bgcolor()
      "orange"
      >>> screen.bgcolor(0.5,0,0.5)
      >>> screen.bgcolor()
      "#800080"

>>> help(Turtle.penup)
Help on method penup in module turtle:

penup(self) unbound turtle.Turtle method
    Pull the pen up -- no drawing when moving.

    Aliases: penup | pu | up

    No argument

    >>> turtle.penup()

  • The docstrings of the functions which are derived from methods have a modified form:

    >>> help(bgcolor)
Help on function bgcolor in module turtle:

bgcolor(*args)
    Set or return backgroundcolor of the TurtleScreen.

    Arguments (if given): a color string or three numbers
    in the range 0..colormode or a 3-tuple of such numbers.

    Example::

      >>> bgcolor("orange")
      >>> bgcolor()
      "orange"
      >>> bgcolor(0.5,0,0.5)
      >>> bgcolor()
      "#800080"

>>> help(penup)
Help on function penup in module turtle:

penup()
    Pull the pen up -- no drawing when moving.

    Aliases: penup | pu | up

    No argument

    Example:
    >>> penup()

These modified docstrings are created automatically together with the function definitions that are derived from the methods at import time.

24.1.6.2. Translation of docstrings into different languages

There is a utility to create a dictionary the keys of which are the method names and the values of which are the docstrings of the public methods of the classes Screen and Turtle.

turtle.write_docstringdict(filename="turtle_docstringdict")
Parâmetros

filename – a string, used as filename

Create and write docstring-dictionary to a Python script with the given filename. This function has to be called explicitly (it is not used by the turtle graphics classes). The docstring dictionary will be written to the Python script filename.py. It is intended to serve as a template for translation of the docstrings into different languages.

If you (or your students) want to use turtle with online help in your native language, you have to translate the docstrings and save the resulting file as e.g. turtle_docstringdict_german.py.

If you have an appropriate entry in your turtle.cfg file this dictionary will be read in at import time and will replace the original English docstrings.

At the time of this writing there are docstring dictionaries in German and in Italian. (Requests please to glingl@aon.at.)

24.1.6.3. How to configure Screen and Turtles

The built-in default configuration mimics the appearance and behaviour of the old turtle module in order to retain best possible compatibility with it.

If you want to use a different configuration which better reflects the features of this module or which better fits to your needs, e.g. for use in a classroom, you can prepare a configuration file turtle.cfg which will be read at import time and modify the configuration according to its settings.

The built in configuration would correspond to the following turtle.cfg:

width = 0.5
height = 0.75
leftright = None
topbottom = None
canvwidth = 400
canvheight = 300
mode = standard
colormode = 1.0
delay = 10
undobuffersize = 1000
shape = classic
pencolor = black
fillcolor = black
resizemode = noresize
visible = True
language = english
exampleturtle = turtle
examplescreen = screen
title = Python Turtle Graphics
using_IDLE = False

Short explanation of selected entries:

  • The first four lines correspond to the arguments of the Screen.setup() method.

  • Line 5 and 6 correspond to the arguments of the method Screen.screensize().

  • shape can be any of the built-in shapes, e.g: arrow, turtle, etc. For more info try help(shape).

  • If you want to use no fillcolor (i.e. make the turtle transparent), you have to write fillcolor = "" (but all nonempty strings must not have quotes in the cfg-file).

  • If you want to reflect the turtle its state, you have to use resizemode = auto.

  • If you set e.g. language = italian the docstringdict turtle_docstringdict_italian.py will be loaded at import time (if present on the import path, e.g. in the same directory as turtle.

  • The entries exampleturtle and examplescreen define the names of these objects as they occur in the docstrings. The transformation of method-docstrings to function-docstrings will delete these names from the docstrings.

  • using_IDLE: Set this to True if you regularly work with IDLE and its -n switch (“no subprocess”). This will prevent exitonclick() to enter the mainloop.

There can be a turtle.cfg file in the directory where turtle is stored and an additional one in the current working directory. The latter will override the settings of the first one.

The Lib/turtledemo directory contains a turtle.cfg file. You can study it as an example and see its effects when running the demos (preferably not from within the demo-viewer).

24.1.7. turtledemo — Scripts de Demonstração

The turtledemo package includes a set of demo scripts. These scripts can be run and viewed using the supplied demo viewer as follows:

python -m turtledemo

Alternatively, you can run the demo scripts individually. For example,

python -m turtledemo.bytedesign

The turtledemo package directory contains:

  • A demo viewer __main__.py which can be used to view the sourcecode of the scripts and run them at the same time.

  • Multiple scripts demonstrating different features of the turtle module. Examples can be accessed via the Examples menu. They can also be run standalone.

  • A turtle.cfg file which serves as an example of how to write and use such files.

Os scripts de demonstração são:

Name (nome)

Description (descrição)

Recursos

bytedesign

Padrão de gráficos de tartaruga clássico complexo

tracer(), demora, update()

chaos

graphs Verhulst dynamics, shows that computer’s computations can generate results sometimes against the common sense expectations

coordenadas mundiais

relógio

Relógio analógico que mostra o horário do seu computador

tartarugas como as mãos do relógio, ontimer

colormixer

experimento com r, g, b

ondrag()

forest

3 breadth-first trees

randomization

fractalcurves

Curvas de Hilbert & Koch

recursão

lindenmayer

ethnomathematics (indian kolams)

L-System

minimal_hanoi

Torres de Hanoi

Tartarugas retângulos como discos de Hanói (shape, shapesize)

nim

play the classical nim game with three heaps of sticks against the computer.

turtles as nimsticks, event driven (mouse, keyboard)

paint

programa de desenho super minimalista

onclick()

peça

elementar

tartaruga: aparência e animação

penrose

aperiodic tiling with kites and darts

stamp()

planet_and_moon

simulação do sistema gravitacional

formas compostas, Vec2D

round_dance

dancing turtles rotating pairwise in opposite direction

compound shapes, clone shapesize, tilt, get_shapepoly, update

sorting_animate

visual demonstration of different sorting methods

simple alignment, randomization

tree

a (graphical) breadth first tree (using generators)

clone()

two_canvases

desenho simples

tartarugas em duas telas

wikipedia

um padrão do artigo wikipedia sobre gráficos de tartaruga

clone(), undo()

yinyang

outro exemplo elementar

circle()

Diverta-se!

24.1.8. Modificações desde a versão do Python 2.6

  • The methods Turtle.tracer(), Turtle.window_width() and Turtle.window_height() have been eliminated. Methods with these names and functionality are now available only as methods of Screen. The functions derived from these remain available. (In fact already in Python 2.6 these methods were merely duplications of the corresponding TurtleScreen/Screen-methods.)

  • The method Turtle.fill() has been eliminated. The behaviour of begin_fill() and end_fill() have changed slightly: now every filling-process must be completed with an end_fill() call.

  • A method Turtle.filling() has been added. It returns a boolean value: True if a filling process is under way, False otherwise. This behaviour corresponds to a fill() call without arguments in Python 2.6.

24.1.9. Modificações desde a versão do Python 3.0

  • The methods Turtle.shearfactor(), Turtle.shapetransform() and Turtle.get_shapepoly() have been added. Thus the full range of regular linear transforms is now available for transforming turtle shapes. Turtle.tiltangle() has been enhanced in functionality: it now can be used to get or set the tiltangle. Turtle.settiltangle() has been deprecated.

  • The method Screen.onkeypress() has been added as a complement to Screen.onkey() which in fact binds actions to the keyrelease event. Accordingly the latter has got an alias: Screen.onkeyrelease().

  • The method Screen.mainloop() has been added. So when working only with Screen and Turtle objects one must not additionally import mainloop() anymore.

  • Two input methods has been added Screen.textinput() and Screen.numinput(). These popup input dialogs and return strings and numbers respectively.

  • Two example scripts tdemo_nim.py and tdemo_round_dance.py have been added to the Lib/turtledemo directory.