Analog clock - Pythonista

from scene import *
from datetime import datetime
from math import sin, cos, radians

font = 'HelveticaNeue-Thin'

# scene's text() shorcut
def txt(x,y,t,f=font,s=14):
  text(t,f,s,x,y)

# scene's ellipse() shortcut
def circle(cx,cy,d,t=2):
  stroke_weight(t)
  ellipse(cx-d/2,cy-d/2,d,d)

# radius by angle in degree clockwise
def rad(cx,cy,a,r):
  x = cx + r*sin(radians(a))
  y = cy + r*cos(radians(a))
  return x,y

class clock(Scene):
  def setup(self):
    # settings
    self.quartz = False

  def should_rotate(self, orientation):
    return True # support rotation

  def draw(self):
    # get current datetime
    n = datetime.now()

    # setup clock dimension
    sz = 14 # arc circle size
    s = sz + sz/2 # space between arc
    w = self.size.w - 2*sz # offset
    h = self.size.h - 2*sz
    x = w/2 + sz # origin of the clock
    y = h/2 + sz
    d = h-s*2 if w > h else w-s*2
    r = d/2
    t = '%02d:%02d:%02d'

    # setup clock values
    if not self.quartz:
      # milisecond
      msec = n.microsecond / 10000.0
      sec  = (n.second + msec/100) * 6.0
    else:
      sec  = n.second * 6.0
    min  = (n.minute + (1.0*n.second)/60) * 6.0
    hour = n.hour-12 if n.hour > 12 else n.hour
    hour = (hour + (1.0*n.minute)/60) * 30.0

    # default style
    background(0.2,0.2,0.2)
    stroke(1,1,1,1)
    fill(0,0,0,0)

    # draw clock ticks
    for i in range(0,360,6):
      ax,ay = rad(x,y,i,r)
      circle(ax,ay,1)
    for i in range(0,360,30):
      ax,ay = rad(x,y,i,r)
      circle(ax,ay,4)

    # draw clock text
    txt(x,y+1.25*r+s,'ANALOG CLOCK')
    t = t % (n.hour,n.minute,n.second)
    txt(x,y-1.2*r-s,t)
    for i in range(0,360,30):
      ax,ay = rad(x,y,i,r-s)
      if i == 0: i = 360 # avoid 0
      txt(ax,ay,str(i/30))

    # draw second hand
    ax,ay = rad(x,y,sec,r)
    circle(ax,ay,sz,2)
    ax,ay = rad(x,y,sec,r-sz/2)
    line(x,y,ax,ay)
    ax,ay = rad(x,y,sec-180,s) # tail
    line(x,y,ax,ay)

    # draw minute hand
    ax,ay = rad(x,y,min,r-s)
    circle(ax,ay,1.5*sz,4)
    ax,ay = rad(x,y,min,r-s-sz/2)
    line(x,y,ax,ay)
    ax1,ay1 = rad(x,y,min,r-s+sz/2)
    ax2,ay2 = rad(x,y,min,r-s+sz/2+sz)
    line(ax1,ay1,ax2,ay2) # pointer

    # draw hour hand
    ax,ay = rad(x,y,hour,r/2.5)
    circle(ax,ay,2*sz,8)
    ax,ay = rad(x,y,hour,r/2.5-sz/2)
    line(x,y,ax,ay)
    ax1,ay1 = rad(x,y,hour,r/2.5-sz/2+sz)
    ax2,ay2 = rad(x,y,hour,r/2.5-sz/2+2*sz)
    line(ax1,ay1,ax2,ay2) # pointer

    # draw center
    fill(.2,.2,.2,1)
    circle(x,y,1.5*sz)

run(clock())