Python turtle.heading函数代码示例

    def draw_state(self):
        """
        the core of the class

        Interprete character:

        F: move forward
        +: turn right
        -: turn left
        [: push (position, heading)
        ]: pop (position, heading)
        """
        import turtle

        state = self.lsystem().state()
        for c in state:
            if c == 'F':
                turtle.forward(self.length)
            if c == '+':
                turtle.right(self.angle)
            if c == '-':
                turtle.left(self.angle)
            if c == '[':
                self.stack.append((turtle.position(), turtle.heading()))
            if c == ']':
                if len(self.stack) == 0:
                    raise ValueError('inconsistant state: using to much `]`')
                pos, head = self.stack.pop()
                turtle.penup()
                turtle.setpos(pos)
                turtle.setheading(head)
                turtle.pendown()
        return self

def von_koch(l, n):
    t.forward(l)
    von_koch(l / 3, n - 1)
    t.setheading(t.heading() + 60)
    von_koch(l / 3, n - 1)
    t.setheading(t.heading() - 120)
    von_koch(l / 3, n - 1)
    t.setheading(t.heading() + 60)

def main():
	turtle.color('red')
	turtle.heading()
	turtle.left(80)
	turtle.speed(5)
	turtle.pendown()
	turtle.fill(True)

	turtle.circle(30,90)

def randomDirection():
        if remainingX > 0 and remainingY > 0:
                if turtle.xcor() < 0 and forwardX > backwardX:
                        randomInt = random.randrange(0,3)
                else:
                        randomInt = random.randrange(0,2)

                if randomInt == 0:
                        return NORTH
                elif randomInt == 1 and turtle.heading() != WEST:
                        return EAST
                elif randomInt == 2 and turtle.heading() != EAST:
                        return WEST

def draw(cmds, size=2): #output tree
    stack = []
    for cmd in cmds:
        if cmd=='F':
            turtle.forward(size)
        elif cmd=='-':
            t = random.randrange(0,7,1)
            p = ["Red","Green","Blue","Grey","Yellow","Pink","Brown"]
            turtle.color(p[t])
            turtle.left(15) #slope left
        elif cmd=='+':
            turtle.right(15) #slope right
            t = random.randrange(0,7,1) #рандомная пер. для цвета
            p = ["Red","Green","Blue","Grey","Yellow","Pink","Brown"] #ряд цветов
            turtle.color(p[t]) #выбор цвета из ряда
        elif cmd=='X':
            pass
        elif cmd=='[':
            stack.append((turtle.position(), turtle.heading()))
        elif cmd==']':
            position, heading = stack.pop()
            turtle.penup()
            turtle.setposition(position)
            turtle.setheading(heading)  
            turtle.pendown()
    turtle.update()

def makeSquare(size, person=None, fill=False):
    origPosition = turtle.pos()
    origHead = turtle.heading()
    turtle.penup()
    goDown(size)
    if(person != None or fill == True):
        if(fill==True or person.affected):
            turtle.begin_fill()
    turtle.pendown()
    goLeft(size)
    goUp(2*size)
    goRight(2*size)
    goDown(2*size)
    goLeft(size)
    if(person != None or fill==True):
        if(fill==True or person.affected):
            turtle.end_fill()
    turtle.penup()
    turtle.goto(origPosition)
    turtle.setheading(origHead)
    if(person != None or fill==True):
        if(fill==True or person.affected):
            turtle.color('black')
        if(person.multipleNotShown == 0):
            turtle.write(str(person.name())+"\n"+probString(person), align="center")
        else:
            turtle.write(str(person.name())+"\n"+probString(person)+"\n\n"+str(person.multipleNotShown), align="center")
    turtle.color('blue')
    turtle.penup()

def makeDiamond(size, person=None, fill=False):
    origPosition = turtle.pos()
    origHead = turtle.heading()
    turtle.penup()
    goDown(size)
    turtle.pendown()
    if(person != None or fill==True):
        if(fill==True or person.affected):
            turtle.begin_fill()
    goNorthEast(2*size/np.sqrt(2))
    goNorthWest(2*size/np.sqrt(2))
    goSouthWest(2*size/np.sqrt(2))
    goSouthEast(2*size/np.sqrt(2))
    if(person != None or fill==True):
        if(fill==True or person.affected):
            turtle.end_fill()
    turtle.penup()
    turtle.goto(origPosition)
    turtle.setheading(origHead)
    if(person != None or fill==True):
        if(fill==True or person.affected):
            turtle.color('black')
        if(person.multipleNotShown == 0):
            turtle.write(str(person.name())+"\n"+probString(person), align="center")
        else:
            turtle.write(str(person.name())+"\n"+probString(person)+"\n\n"+str(person.multipleNotShown), align="center")
    turtle.color('blue')
    turtle.penup()

    def verificarPos(self):
        """
        Desc: Método para verificar se a posição e sentido da tartaruga é igual ao inicial
        Use getPos() para pegar o inicial

        Printa: String = Erro
        Retorna: Boolean = True (caso esteja ok) ou False (caso não)

        Exemplo:
        cb.getPos()
        cb.casa(25, 50, 30)
        cb.verificarPos()
        """

        self._retorno = True

        if (round(turtle.xcor()) != self.turtlePosX) or (round(turtle.ycor()) != self.turtlePosY):
            print("A posição atual da tartaruga difere da inicial ({0}, {1})\nEla está em: ({2}, {3})".format(str(self.turtlePosX),
                  str(self.turtlePosY),
                  str(round(turtle.xcor())),
                  str(round(turtle.ycor()))))
            self._retorno = False
        if turtle.heading() != self.turtleDir:
            print("A direção atual da tartaruga difere da inicial (" + str(self.turtleDir) + ")\nEla está em:", str(turtle.heading()))
            self._retorno = False

        return self._retorno

def makeTree(h, l, b, d, ad):
    
    Base(b)
    
    turtle.color("brown")
    
    
    if h > 0:
        
        if h == 1:
            turtle.color("green")

        if h== 4:
            Apple(b)
        if d == 0:
            
            makeTree(h-1 , l*.75, drawLimb(l, d*ad), d+1,ad)
        else:
            y = turtle.heading()
            
            makeTree(h-1 , l*.75, drawLimb(l*.75, d*ad/2.00), d,ad)
            Base(b)
            d = d*-1
            turtle.setheading(y)
            makeTree(h-1 , l*.75, drawLimb(l*.75, d*ad/2.00), d,ad)
        
    else:
        Base(b)

def main():
  #设置一个画面
  windows = turtle.Screen()
  #设置背景
  windows.bgcolor('black')
  #生成一个黄色乌龟
  bran = turtle.Turtle()
  bran.shape('turtle')
  bran.color('white')
  
  turtle.home()
  turtle.dot()
  turtle.fd(50); turtle.dot(20, "blue"); turtle.fd(50)
  turtle.position()
  (100.00,-0.00)
  turtle.heading()

def draw_arrow():
    '''Draw an arrow toward the turtle's current heading, then return to
    position and heading.'''

    arrow_length = 7 # pixels
    arrow_width = 10 # pixels
    arrow_end = tt.position()
    old_heading = tt.heading()

    # move to back end of upper line
    tt.penup()
    tt.backward(arrow_length)
    tt.left(90)
    tt.forward(arrow_width)
    # draw upper line
    tt.pendown()
    tt.setposition(arrow_end)
    tt.setheading(old_heading)
    # move to back end of lower line
    tt.penup()
    tt.backward(arrow_length)
    tt.right(90)
    tt.forward(arrow_width)
    # draw lower line
    tt.pendown()
    tt.setposition(arrow_end)
    tt.setheading(old_heading)
    tt.penup()

def drawString( dstring, distance, angle ):
    """ Interpret the characters in string dstring as a series
    of turtle commands. Distance specifies the distance
    to travel for each forward command. Angle specifies the
    angle (in degrees) for each right or left command. The list of 
    turtle supported turtle commands is:
    F : forward
    - : turn right
    + : turn left
    [ : save position, heading
    ] : restore position, heading
    """
    stack = []
    for c in dstring:
		if c == 'F':
			turtle.forward(distance)
		elif c == '-':
			turtle.right(angle)
		elif c == '+':
			turtle.left(angle)
		elif c == '[':
			stack.append(turtle.position())
			stack.append(turtle.heading())
		elif c == ']':
			turtle.up()
			turtle.setheading(stack.pop())
			turtle.goto(stack.pop())
			turtle.down()
		turtle.update()

def draw_l(word):
    turtle.up()
    turtle.clear()
    turtle.setposition(0, 0)
    turtle.setheading(0)
    turtle.bk(INITIAL_POS[0])
    turtle.down()
    turtle.st()
    stack = []
    for char in word:
        if char == '0':
            turtle.fd(SIZE[0])
        if char == '1':
            turtle.fd(SIZE[0])
        if char == '[':
            stack.append((turtle.position(), turtle.heading()))
            turtle.lt(45)
        if char == ']':
            position, heading = stack.pop()
            turtle.up()
            turtle.setposition(position)
            turtle.setheading(heading)
            turtle.rt(45)
            turtle.down()
    turtle.ht()

def moveDir(turtle, direction):
        if turtle.heading() != direction:
                turtle.setheading(direction)

        turtle.forward(MOVING_DISTANCE)
        global remainingY
        newY = remainingY - 1
        remainingY = newY

def drawDome(size, degrees):
    turtle.setheading(90)
    turtle.fillcolor("red")
    turtle.begin_fill()
    drawSemi(size, "right", degrees, colour="black" )
    turtle.setheading(turtle.heading()+degrees+degrees-180)
    drawSemi(size, "right", degrees, colour="black")
    turtle.end_fill()