Draw a line chart based on user input - turtle-graphics

Question

Please help me to draw a simple line chart in python turtle module based on user input. I am able to draw the x and y axis. The x-axis tick is equal to the number of data points. For example, if the user input is 5 then it will be 5 ticks labelled 1 to 5 and so on. However, the tick for y-axis has 6 ticks(fixed) labelled from 0 to 20, increment in 4(0,4,8..20).
I can't figure out the logic for plotting y values based on user input. For example, if the user types 15, it needs to go to the corresponding data point in y axis and put a dot in there. Similarly, if the user types 5 it needs to go the corresponding value in y axis as well plus connecting to the preceding data point(in this case connecting 15 from previous point to 5 in the current point) and so on based on user input. Also, my x and y labeling could be done it in a better way. Here is my code. Any help is much appreciated. Please look at the image description, I am aiming for similar results.
import turtle as t
import time
wn = t.Screen() # create a window for the turtle to draw on
wn.title("Turtle Demo") # the title to show at the top of the window
WINDOW_WIDTH = 500 # size constants for easy changing
WINDOW_HEIGHT = 500
wn.setup(WINDOW_WIDTH, WINDOW_HEIGHT, 200, 10) # specify window size (width, height)
user_input = t.numinput(title='Line graph', prompt='How many data points:')
x_max = user_input
# print(userInput)
# graph window
x_min = 0
y_min = 0
y_max = 5
# tick info
t_l = 0.1
x_t_space = 1
y_t_space = 1
wn.setworldcoordinates(x_min, y_min, x_max, y_max)
# Draw x-axis
t.tracer(10)
t.hideturtle()
t.up()
t.goto(x_min, 0)
t.down()
t.goto(user_input, 0.0)
t.up()
# Draw the y-axis
t.goto(0.0, y_min)
t.down()
t.goto(0.0, y_max)
t.up()
# Draw the x tick marks
n_x_ticks = int((x_max - x_min) / x_t_space) + 1
for tick in range(n_x_ticks):
loc = x_min + tick * x_t_space
t.up()
t.goto(loc, -t_l * 0.4)
t.down()
t.goto(loc, t_l * 0.4)
t.up()
t.write(tick)
# Draw the y tick marks
y_label = range(0, 21, 4)
n_y_ticks = int((y_max - y_min) / y_t_space) + 1
for tick in range(n_y_ticks):
loc = y_min + tick * y_t_space
t.up()
t.goto(-t_l * 0.4, loc)
t.down()
t.goto(t_l * 0.4, loc)
for i in y_label:
tick = i
print(tick)
t.write(tick, align="left", font=("Arial", 8, "normal"))
# get user input and plot the y value as long as user needed.
# the below code marks the value in the x-axis itself, that is not what I want.
#I want the value to get plotted outside the axis as in the normal line chart
t.backward
t.goto(0, 0)
t.tiltangle(45)
user_value = t.numinput(title='Line graph', prompt='Enter the first value:')
t.shape("square")
t.stamp()
t.forward(user_value)
user_value = t.numinput(title='Line graph', prompt='Enter the next value:')
t.shape("square")
t.stamp()
t.forward(user_value)
user_value = t.numinput(title='Line graph', prompt='Enter the next value:')
t.shape("square")
t.stamp()
t.forward(user_value)
Line chart

Answer 1

The input size is defined by the user and you want the same size of y-values.
Do the following:
for i in range (0, int(user_input)):
user_value = t.numinput(title='Line graph', prompt='Enter the value:')
t.shape("square")
t.stamp()
t.forward(user_value)
EDIT:
Just use matplotlib, it is very simple
import numpy as np
import matplotlib.pyplot as plt
user = int(input("Enter number of data: "))
x = np.arange(user)
y = []
for i in range (0, user):
value = int(input("Enter value: "))
y.append(value)
y = np.array(y)
plt.scatter(x, y)
plt.plot(x, y)
plt.show()
Input:
Enter number of data: 9
Enter value: 10
Enter value: 30
Enter value: 20
Enter value: 50
Enter value: 60
Enter value: 35
Enter value: 38
Enter value: 12
Enter value: 31
Output:
which is the same as the chart you provided.