punch_tape_animation.py

import sys
from time import sleep
import random
import cursor



class Renderer:

  def __init__(self, width, height):
    self.width = int(width)
    self.height = int(height)
    self.content = [ width * ' ' for i in range(0,height) ]
    self.currentX = 0
    self.currentY = 0

  def render(self):
    self.moveToOrigin()
    sys.stdout.write('\n'.join(self.content))
    sys.stdout.flush()
    self.currentX = len(self.content[0])
    self.currentY = len(self.content) - 1

  def moveToOrigin(self):
    self.moveBy(-self.currentX,-self.currentY)

  def moveBy(self,x,y):
    self.currentX += x
    self.currentY += y

    if x < 0:
      xMove = '\033[%iD' % -x
    elif x > 0:
      xMove = '\033[%iC' % x
    else:
      xMove = ''

    if y < 0:
      yMove = '\033[%iA' % -y
    elif y > 0:
      yMove = '\033[%iB' % y
    else:
      yMove = ''

    #print(x,y)
    sys.stdout.write(xMove + yMove)

  def setChar(self, char):
    self.setCharAt(self.currentX, self.currentY, char)

  def setCharAt(self, x, y, char):
    self.content[y] = self.content[y][0:x] + char[0] + self.content[y][x+1:]

  def setContent(self, content):
    self.content = content

cursor.hide()
try:

    print()

    w = 80
    h = 7
    framerate = 3
    renderer = Renderer(w,h)

    spoke_hole = '◌'
    data_holes = '   ●'

    lines = [[],[],[],[],[],[],[]]

    while True:
      renderer.setContent([ ''.join(lines[i]) for i in range(0,h) ])
      renderer.render()
      for i in range(0,h):
          if i == 6:
              lines[i] += [' ',' ']
          elif i == 2:
              lines[i] = [spoke_hole,' '] + lines[i]
          else:
              lines[i] = [random.choice(data_holes),' '] + lines[i]

          lines[i] = lines[i][0:w]
      sleep(1/framerate)

except KeyboardInterrupt: pass
except Exception: pass

cursor.show()