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#!/usr/bin/env python
from blessed import Terminal
term = Terminal()
if not term.does_mouse(report_motion=True):
print("This terminal does not support mouse motion tracking!")
else:
# Track current color for painting
color_idx = 7
num_colors = min(256, term.number_of_colors)
header = "Mouse wheel sets color=[{0}], LEFT button paints, RIGHT erases, ^C:quit"
def make_header():
return term.home + term.center(header.format(term.color(color_idx)('█')))
text = make_header()
with term.cbreak(), term.fullscreen(), term.mouse_enabled(report_motion=True):
while True:
print(text, end='', flush=True)
inp = term.inkey()
if inp.name and inp.name.startswith('MOUSE_'):
# process scroll wheel changes color
_offset = (1 if inp.name == 'MOUSE_SCROLL_UP' else
-1 if inp.name == 'MOUSE_SCROLL_DOWN' else 0)
color_idx = (color_idx + _offset) % num_colors
# and left mouse paints, right erases
char = (term.color(color_idx)('█')
if inp.name.startswith('MOUSE_LEFT')
else ' ' if inp.name.startswith('MOUSE_RIGHT')
else '')
# update draw text using mouse_yx
text = make_header() + term.move_yx(*inp.mouse_yx) + char
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