CODEWITHSUNDEEP
pythonturtle-graphics
Xavier Van Vinken
Xavier Van Vinken

Reputation: 63

python turtle goto is not working

I have written a turtle programma that uses data to make a line on a graph chart. Everything works fine except i call the make_line() in the chartlines. The goto is excecuted but doesn't draw a line. Even if i put a turtle.down() before i go in to the While loop it doesn't draw a line. 

import turtle


def Change_tekenpunt(x,y):
    turtle.up()
    turtle.goto(x,y)
    turtle.down()


def xAxisTurtle(days):

    xAxis = turtle
    xAxis.ht()
    Change_tekenpunt(-300, -220)
    x = -275
    for i in range(0,days+1):
        xAxis.write(i)
        Change_tekenpunt(x, -220)
        x+=25

def yAxisTurtle():
    yAxis = turtle
    yAxis.ht()
    Change_tekenpunt(-310, -200)
    y = -160
    for i in range(0, 1601, 200):
        yAxis.write(i)
        Change_tekenpunt(-330, y)
        y+=50

def point():
    turtle.begin_fill() # Begin to fill color in a shape
    turtle.color("black")
    turtle.circle(3) # Draw a circle
    turtle.end_fill() # Fill the shape

def make_line(x, y,gegevens):
    Change_tekenpunt(x,y)
    i = 0 
    while i < len(gegevens):
        y = gegevens[i][0]
        y //= 4
        Change_tekenpunt(x,y)
        x+=25
        i+=1


def chartlines(x,y,days, gegevens):

      char = turtle
      Change_tekenpunt(x,y) 
      char.tracer(0,0)
      char.speed(0)
      char.ht()
      point()
      for i in range(days):      
          char.forward(25)
          char.left(270)
          point()
          char.left(90)

      char.left(180)
      char.forward(25*days)
      char.left(270)

      for i in range(8):
          char.forward(50)
          char.left(90)
          point()
          char.left(270)

      char.left(180)
      char.forward(400)

      xAxisTurtle(days)
      yAxisTurtle()
      make_line(x, y,gegevens)

Upvotes: 0

Views: 2210

Answers (1)

Kidus
Kidus

Reputation: 1843

The problem is in Change_tekenpunt function. You need to keep the turtle.down() while drawing the graph. So, you'll need to make some changes to the Change_tekenpunt function as follows:

def Change_tekenpunt(x,y,up=True):
    if up:
        turtle.up()
    turtle.goto(x,y)
    turtle.down()

You use this function to draw the chart lines and also the graph. I've added an extra up argument (which defaults to True) because you need to set this to False whenever you're drawing a graph. It has to be down while it's moving. Therefore, in the make_line function, in the while-loop, add the False argument to the Change_tekenpunt function call.

def make_line(x, y,gegevens):
    Change_tekenpunt(x,y)
    i = 0 
    while i < len(gegevens):
        y = gegevens[i][0]
        y //= 4
        Change_tekenpunt(x, y, False) #add  the False argument here
        x+=25
        i+=1

Finally, in the chartlines function, set the .tracer to (1, 0).

char.tracer(0,0)

char.tracer(1,0)

Or you can instead add turtle.update() at the end of the Change_tekenpunt function. Hope this helps.

Upvotes: 1

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