/*文本；缩小、放大*/
:read-only,:link,:enabled {cursor:url("${imDot}")4 4,auto}
:active #cursor{${l}:0px}
body:has(:link:hover,:enabled:hover) #cursor {${l}:40px; opacity:.2}
/*定位；缓动*/
#cursor{${l}:16px; opacity:.5; pointer-events:none; z-index:100; transition:.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
width: var(${l}); height: var(${l});
position:fixed; top:calc(-0.5 * var(--l));left:calc(-0.5 * var(--l)) }

import os, cv2, time
from numpy import*

Nm=array; mix=interp
sh=lambda s: os.popen(s).read()[:-1]

def heart(P, k=.8):
  t = mix(mod(iTime, k), [0, k], [0.3, k])  # Heartbeat
  r = (P[1] - power(abs(P[0]), t))**2 + P[0]**2 - 1.0  # Grayscale function
  return where(r < 0.3, mix(-r, [0, 0.3], [1, 4]), r)

grays = Nm([*" .-:", '\x1B[1;31m=\x1B[0m', *"+*%@#"])
GL=lambda w,h: Nm(meshgrid(linspace(0,1, w), linspace(1,0, h)))

def drawBW(g, wh=flip(int32(sh('stty size').split())), bg=grays):
  a=(1-g(GL(*wh)*5-2-sin(iTime)))*256 if callable(g) else cv2.cvtColor(cv2.resize(g, wh) , cv2.COLOR_BGR2GRAY)
  b=int8(mix(a, (0,256), (0,len(bg)-1) ))
  print('\x1B[0;0H', '\n'.join(''.join(y) for y in bg[b] ))

try: #.: ipy -i
  @get_ipython().pt_app.key_bindings.add('c-k')
  def cropBW(F5):
    g=cv2.imread(sh('zenity --file-selection'))
    drawBW(g)
except:
  for iTime in (x/100 for x in range(0, 600)): drawBW(heart); time.sleep(1/60)