Why is my code rendering curves rotated 90 degrees?

Question

I'm trying to make a heating cable layout for floor heating and i got stuck with this problem.

This i what i got from my code

So i made a small program asking for width,lenght of the room and calculating the are in m2. And i need a graphical representation of how cable should be on the floor. This is my code for arch:

# Add C-shaped curves at the end of each section


for i in range(int(width // spacing)):
theta = np.linspace(0, np.pi, 100)
x_curve = length + (spacing / 2) * np.cos(theta)
y_curve = (i + 1) * spacing + (spacing / 2) * np.sin(theta)
color = 'blue' if total_length < 5 else 'red'
ax.plot(x_curve, y_curve, color=color)
total_length += np.pi * (spacing / 2)

I'm a beginner so i tried what i knew so far. If someone can guide me or help me in anyway possible.

Answer 1

I suspect you want to lay your cable like this.

The end arcs are essentially the same (so don't keep re-calculating them). Just shift them up at each crossing and alternate left and right sides.

import numpy as np
import matplotlib.pyplot as plt

width = 4
spacing = 0.25
N = 17
length = 4
total_length = 0

theta = np.linspace(0, np.pi, 100)
xarc = (spacing / 2) * np.sin(theta)
yarc = (spacing / 2) * ( 1 - np.cos(theta) )
base = 0
for i in range( N ):
   color = 'blue' if total_length < 5 else 'red'
   plt.plot( [0,length], [base,base], color=color)         # draw line
   if i == N - 1: break                                    # no connector at end

   if i % 2 == 0:
      x_curve = length + xarc                              # arc on right
   else:
      x_curve = -xarc                                      # arc on left
   y_curve = base + yarc
   plt.plot(x_curve, y_curve, color=color)                 # draw connector

   base += spacing                                         # update base and length
   total_length += length + np.pi * (spacing / 2)

plt.show()