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box_drawing.py
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box_drawing.py
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#!/usr/bin/env python
# License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
#
# NOTE: to add a new glyph, add an entry to the `box_chars` dict, then update
# the functions `font_for_cell` and `box_glyph_id` in `kitty/fonts.c`.
#
import math
from functools import lru_cache, wraps
from functools import partial as p
from itertools import repeat
from typing import Any, Callable, Dict, Iterable, Iterator, List, Literal, MutableSequence, Optional, Sequence, Tuple
scale = (0.001, 1., 1.5, 2.)
_dpi = 96.0
BufType = MutableSequence[int]
def set_scale(new_scale: Sequence[float]) -> None:
global scale
scale = (new_scale[0], new_scale[1], new_scale[2], new_scale[3])
def thickness(level: int = 1, horizontal: bool = True) -> int:
pts = scale[level]
return int(math.ceil(pts * (_dpi / 72.0)))
def draw_hline(buf: BufType, width: int, x1: int, x2: int, y: int, level: int) -> None:
' Draw a horizontal line between [x1, x2) centered at y with the thickness given by level '
sz = thickness(level=level, horizontal=False)
start = y - sz // 2
for y in range(start, start + sz):
offset = y * width
for x in range(x1, x2):
buf[offset + x] = 255
def draw_vline(buf: BufType, width: int, y1: int, y2: int, x: int, level: int) -> None:
' Draw a vertical line between [y1, y2) centered at x with the thickness given by level '
sz = thickness(level=level, horizontal=True)
start = x - sz // 2
for x in range(start, start + sz):
for y in range(y1, y2):
buf[x + y * width] = 255
def half_hline(buf: BufType, width: int, height: int, level: int = 1, which: str = 'left', extend_by: int = 0) -> None:
x1, x2 = (0, extend_by + width // 2) if which == 'left' else (width // 2 - extend_by, width)
draw_hline(buf, width, x1, x2, height // 2, level)
def half_vline(buf: BufType, width: int, height: int, level: int = 1, which: str = 'top', extend_by: int = 0) -> None:
y1, y2 = (0, height // 2 + extend_by) if which == 'top' else (height // 2 - extend_by, height)
draw_vline(buf, width, y1, y2, width // 2, level)
def get_holes(sz: int, hole_sz: int, num: int) -> List[Tuple[int, ...]]:
all_holes_use = (num + 1) * hole_sz
individual_block_size = (sz - all_holes_use) // (num + 1)
half_hole_sz = hole_sz // 2
pos = - half_hole_sz
holes = []
while pos < sz:
left = max(0, pos)
right = min(sz, pos + hole_sz)
if right > left:
holes.append(tuple(range(left, right)))
pos = right + individual_block_size
return holes
hole_factor = 8
def add_hholes(buf: BufType, width: int, height: int, level: int = 1, num: int = 1) -> None:
line_sz = thickness(level=level, horizontal=True)
hole_sz = width // hole_factor
start = height // 2 - line_sz // 2
holes = get_holes(width, hole_sz, num)
for y in range(start, start + line_sz):
offset = y * width
for hole in holes:
for x in hole:
buf[offset + x] = 0
def add_vholes(buf: BufType, width: int, height: int, level: int = 1, num: int = 1) -> None:
line_sz = thickness(level=level, horizontal=False)
hole_sz = height // hole_factor
start = width // 2 - line_sz // 2
holes = get_holes(height, hole_sz, num)
for x in range(start, start + line_sz):
for hole in holes:
for y in hole:
buf[x + width * y] = 0
def hline(buf: BufType, width: int, height: int, level: int = 1) -> None:
half_hline(buf, width, height, level=level)
half_hline(buf, width, height, level=level, which='right')
def vline(buf: BufType, width: int, height: int, level: int = 1) -> None:
half_vline(buf, width, height, level=level)
half_vline(buf, width, height, level=level, which='bottom')
def hholes(buf: BufType, width: int, height: int, level: int = 1, num: int = 1) -> None:
hline(buf, width, height, level=level)
add_hholes(buf, width, height, level=level, num=num)
def vholes(buf: BufType, width: int, height: int, level: int = 1, num: int = 1) -> None:
vline(buf, width, height, level=level)
add_vholes(buf, width, height, level=level, num=num)
def corner(buf: BufType, width: int, height: int, hlevel: int = 1, vlevel: int = 1, which: Optional[str] = None) -> None:
wh = 'right' if which is not None and which in '┌└' else 'left'
half_hline(buf, width, height, level=hlevel, which=wh, extend_by=thickness(vlevel, horizontal=True) // 2)
wv = 'top' if which is not None and which in '└┘' else 'bottom'
half_vline(buf, width, height, level=vlevel, which=wv)
def vert_t(buf: BufType, width: int, height: int, a: int = 1, b: int = 1, c: int = 1, which: Optional[str] = None) -> None:
half_vline(buf, width, height, level=a, which='top')
half_hline(buf, width, height, level=b, which='left' if which == '┤' else 'right')
half_vline(buf, width, height, level=c, which='bottom')
def horz_t(buf: BufType, width: int, height: int, a: int = 1, b: int = 1, c: int = 1, which: Optional[str] = None) -> None:
half_hline(buf, width, height, level=a, which='left')
half_hline(buf, width, height, level=b, which='right')
half_vline(buf, width, height, level=c, which='top' if which == '┴' else 'bottom')
def cross(buf: BufType, width: int, height: int, a: int = 1, b: int = 1, c: int = 1, d: int = 1) -> None:
half_hline(buf, width, height, level=a)
half_hline(buf, width, height, level=b, which='right')
half_vline(buf, width, height, level=c)
half_vline(buf, width, height, level=d, which='bottom')
def downsample(src: BufType, dest: BufType, dest_width: int, dest_height: int, factor: int = 4) -> None:
src_width = factor * dest_width
def average_intensity_in_src(dest_x: int, dest_y: int) -> int:
src_y = dest_y * factor
src_x = dest_x * factor
total = 0
for y in range(src_y, src_y + factor):
offset = src_width * y
for x in range(src_x, src_x + factor):
total += src[offset + x]
return total // (factor * factor)
for y in range(dest_height):
offset = dest_width * y
for x in range(dest_width):
dest[offset + x] = min(255, dest[offset + x] + average_intensity_in_src(x, y))
class SSByteArray(bytearray):
supersample_factor = 1
def supersampled(supersample_factor: int = 4) -> Callable[[Callable[..., None]], Callable[..., None]]:
# Anti-alias the drawing performed by the wrapped function by
# using supersampling
def create_wrapper(f: Callable[..., None]) -> Callable[..., None]:
@wraps(f)
def supersampled_wrapper(buf: BufType, width: int, height: int, *args: Any, **kw: Any) -> None:
w, h = supersample_factor * width, supersample_factor * height
ssbuf = SSByteArray(w * h)
ssbuf.supersample_factor = supersample_factor
f(ssbuf, w, h, *args, **kw)
downsample(ssbuf, buf, width, height, factor=supersample_factor)
return supersampled_wrapper
return create_wrapper
def fill_region(buf: BufType, width: int, height: int, xlimits: Iterable[Iterable[float]], inverted: bool = False) -> None:
full, empty = (0, 255) if inverted else (255, 0)
for y in range(height):
offset = y * width
for x, (upper, lower) in enumerate(xlimits):
buf[x + offset] = full if upper <= y <= lower else empty
def line_equation(x1: int, y1: int, x2: int, y2: int) -> Callable[[int], float]:
m = (y2 - y1) / (x2 - x1)
c = y1 - m * x1
def y(x: int) -> float:
return m * x + c
return y
@supersampled()
def triangle(buf: SSByteArray, width: int, height: int, left: bool = True) -> None:
ay1, by1, y2 = 0, height - 1, height // 2
if left:
x1, x2 = 0, width - 1
else:
x1, x2 = width - 1, 0
uppery = line_equation(x1, ay1, x2, y2)
lowery = line_equation(x1, by1, x2, y2)
xlimits = [(uppery(x), lowery(x)) for x in range(width)]
fill_region(buf, width, height, xlimits)
@supersampled()
def corner_triangle(buf: SSByteArray, width: int, height: int, corner: str) -> None:
if corner == 'top-right' or corner == 'bottom-left':
diagonal_y = line_equation(0, 0, width - 1, height - 1)
if corner == 'top-right':
xlimits = [(0., diagonal_y(x)) for x in range(width)]
elif corner == 'bottom-left':
xlimits = [(diagonal_y(x), height - 1.) for x in range(width)]
else:
diagonal_y = line_equation(width - 1, 0, 0, height - 1)
if corner == 'top-left':
xlimits = [(0., diagonal_y(x)) for x in range(width)]
elif corner == 'bottom-right':
xlimits = [(diagonal_y(x), height - 1.) for x in range(width)]
fill_region(buf, width, height, xlimits)
@supersampled()
def half_triangle(buf: SSByteArray, width: int, height: int, which: str = 'left', inverted: bool = False) -> None:
mid_x, mid_y = width // 2, height // 2
if which == 'left':
upper_y = line_equation(0, 0, mid_x, mid_y)
lower_y = line_equation(0, height - 1, mid_x, mid_y)
limits = tuple((upper_y(x), lower_y(x)) for x in range(width))
elif which == 'top':
first_y = line_equation(0, 0, mid_x, mid_y)
first = tuple((0, first_y(x)) for x in range(mid_x))
second_y = line_equation(mid_x, mid_y, width - 1, 0)
second = tuple((0, second_y(x)) for x in range(mid_x, width))
limits = first + second
elif which == 'right':
upper_y = line_equation(mid_x, mid_y, width - 1, 0)
lower_y = line_equation(mid_x, mid_y, width - 1, height - 1)
limits = tuple((upper_y(x), lower_y(x)) for x in range(width))
elif which == 'bottom':
first_y = line_equation(0, height - 1, mid_x, mid_y)
first_ = tuple((first_y(x), height - 1) for x in range(mid_x))
second_y = line_equation(mid_x, mid_y, width - 1, height - 1)
second_ = tuple((second_y(x), height - 1) for x in range(mid_x, width))
limits = first_ + second_
fill_region(buf, width, height, limits, inverted)
def thick_line(buf: BufType, width: int, height: int, thickness_in_pixels: int, p1: Tuple[int, int], p2: Tuple[int, int]) -> None:
if p1[0] > p2[0]:
p1, p2 = p2, p1
leq = line_equation(*p1, *p2)
delta, extra = divmod(thickness_in_pixels, 2)
for x in range(p1[0], p2[0] + 1):
if 0 <= x < width:
y_p = leq(x)
r = range(int(y_p) - delta, int(y_p) + delta + extra)
for y in r:
if 0 <= y < height:
buf[x + y * width] = 255
@supersampled()
def cross_line(buf: SSByteArray, width: int, height: int, left: bool = True, level: int = 1) -> None:
if left:
p1, p2 = (0, 0), (width - 1, height - 1)
else:
p1, p2 = (width - 1, 0), (0, height - 1)
thick_line(buf, width, height, buf.supersample_factor * thickness(level), p1, p2)
@supersampled()
def cross_shade(buf: SSByteArray, width: int, height: int, rotate: bool = False, num_of_lines: int = 7) -> None:
line_thickness = max(buf.supersample_factor, width // num_of_lines)
delta = int(2 * line_thickness)
y1, y2 = (height, 0) if rotate else (0, height)
for x in range(0, width, delta):
thick_line(buf, width, height, line_thickness, (0 + x, y1), (width + x, y2))
thick_line(buf, width, height, line_thickness, (0 - x, y1), (width - x, y2))
@supersampled()
def half_cross_line(buf: SSByteArray, width: int, height: int, which: str = 'tl', level: int = 1) -> None:
thickness_in_pixels = thickness(level) * buf.supersample_factor
my = (height - 1) // 2
if which == 'tl':
p1 = 0, 0
p2 = width - 1, my
elif which == 'bl':
p2 = 0, height - 1
p1 = width - 1, my
elif which == 'tr':
p1 = width - 1, 0
p2 = 0, my
else:
p2 = width - 1, height - 1
p1 = 0, my
thick_line(buf, width, height, thickness_in_pixels, p1, p2)
@supersampled()
def mid_lines(buf: SSByteArray, width: int, height: int, level: int = 1, pts: Iterable[str] = ('lt',)) -> None:
mid_x, mid_y = width // 2, height // 2
def pt_to_coords(p: str) -> Tuple[int, int]:
if p == 'l':
return 0, mid_y
if p == 't':
return mid_x, 0
if p == 'r':
return width - 1, mid_y
if p == 'b':
return mid_x, height - 1
raise KeyError(f'Unknown p: {p}')
for x in pts:
p1, p2 = map(pt_to_coords, x)
thick_line(buf, width, height, buf.supersample_factor * thickness(level), p1, p2)
ParameterizedFunc = Callable[[float], float]
def cubic_bezier(start: Tuple[int, int], end: Tuple[int, int], c1: Tuple[int, int], c2: Tuple[int, int]) -> Tuple[ParameterizedFunc, ParameterizedFunc]:
def bezier_eq(p0: int, p1: int, p2: int, p3: int) -> ParameterizedFunc:
def f(t: float) -> float:
tm1 = 1 - t
tm1_3 = tm1 * tm1 * tm1
t_3 = t * t * t
return tm1_3 * p0 + 3 * t * tm1 * (tm1 * p1 + t * p2) + t_3 * p3
return f
bezier_x = bezier_eq(start[0], c1[0], c2[0], end[0])
bezier_y = bezier_eq(start[1], c1[1], c2[1], end[1])
return bezier_x, bezier_y
def find_bezier_for_D(width: int, height: int) -> int:
cx = last_cx = width - 1
start = (0, 0)
end = (0, height - 1)
while True:
c1 = cx, start[1]
c2 = cx, end[1]
bezier_x, bezier_y = cubic_bezier(start, end, c1, c2)
if bezier_x(0.5) > width - 1:
return last_cx
last_cx = cx
cx += 1
def get_bezier_limits(bezier_x: ParameterizedFunc, bezier_y: ParameterizedFunc) -> Iterator[Tuple[float, float]]:
start_x = int(bezier_x(0))
max_x = int(bezier_x(0.5))
last_t, t_limit = 0., 0.5
def find_t_for_x(x: int, start_t: float) -> float:
if abs(bezier_x(start_t) - x) < 0.1:
return start_t
increment = t_limit - start_t
if increment <= 0:
return start_t
while True:
q = bezier_x(start_t + increment)
if (abs(q - x) < 0.1):
return start_t + increment
if q > x:
increment /= 2
if increment < 1e-6:
raise ValueError(f'Failed to find t for x={x}')
else:
start_t += increment
increment = t_limit - start_t
if increment <= 0:
return start_t
for x in range(start_x, max_x + 1):
if x > start_x:
last_t = find_t_for_x(x, last_t)
upper, lower = bezier_y(last_t), bezier_y(1 - last_t)
if abs(upper - lower) <= 2: # avoid pip on end of D
break
yield upper, lower
@supersampled()
def D(buf: SSByteArray, width: int, height: int, left: bool = True) -> None:
c1x = find_bezier_for_D(width, height)
start = (0, 0)
end = (0, height - 1)
c1 = c1x, start[1]
c2 = c1x, end[1]
bezier_x, bezier_y = cubic_bezier(start, end, c1, c2)
xlimits = list(get_bezier_limits(bezier_x, bezier_y))
if left:
fill_region(buf, width, height, xlimits)
else:
mbuf = bytearray(width * height)
fill_region(mbuf, width, height, xlimits)
for y in range(height):
offset = y * width
for src_x in range(width):
dest_x = width - 1 - src_x
buf[offset + dest_x] = mbuf[offset + src_x]
def draw_parametrized_curve(
buf: SSByteArray, width: int, height: int, level: int,
xfunc: ParameterizedFunc, yfunc: ParameterizedFunc
) -> None:
supersample_factor = buf.supersample_factor
num_samples = height * 8
delta, extra = divmod(thickness(level), 2)
delta *= supersample_factor
extra *= supersample_factor
seen = set()
for i in range(num_samples + 1):
t = i / num_samples
p = int(xfunc(t)), int(yfunc(t))
if p in seen:
continue
x_p, y_p = p
seen.add(p)
for y in range(y_p - delta, y_p + delta + extra):
if 0 <= y < height:
offset = y * width
for x in range(x_p - delta, x_p + delta + extra):
if 0 <= x < width:
pos = offset + x
buf[pos] = min(255, buf[pos] + 255)
def circle_equations(
origin_x: int = 0, origin_y: int = 0, radius: float = 10., # radius is in pixels as are origin co-ords
start_at: float = 0., end_at: float = 360.
) -> Tuple[ParameterizedFunc, ParameterizedFunc]:
conv = math.pi / 180.
start = start_at * conv
end = end_at * conv
amt = end - start
def x(t: float) -> float:
return origin_x + radius * math.cos(start + amt * t)
def y(t: float) -> float:
return origin_y + radius * math.sin(start + amt * t)
return x, y
def rectircle_equations(
cell_width: int, cell_height: int, supersample_factor: int,
which: str = '╭'
) -> Tuple[ParameterizedFunc, ParameterizedFunc]:
'''
Return two functions, x(t) and y(t) that map the parameter t which must be
in the range [0, 1] to x and y coordinates in the cell. The rectircle equation
we use is:
(|x| / a) ^ (2a / r) + (|y| / a) ^ (2b / r) = 1
where 2a = width, 2b = height and r is radius
The entire rectircle fits in four cells, each cell being one quadrant
of the full rectircle and the origin being the center of the rectircle.
The functions we return do the mapping for the specified cell.
╭╮
╰╯
See https://math.stackexchange.com/questions/1649714
'''
a = ((cell_width // supersample_factor) // 2) * supersample_factor
b = ((cell_height // supersample_factor) // 2) * supersample_factor
radius = cell_width / 2
yexp = cell_height / radius
xexp = radius / cell_width
pow = math.pow
left_quadrants, lower_quadrants = {'╭': (True, False), '╮': (False, False), '╰': (True, True), '╯': (False, True)}[which]
cell_width_is_odd = (cell_width // supersample_factor) % 2
adjust_x = cell_width_is_odd * supersample_factor
if lower_quadrants:
def y(t: float) -> float: # 0 -> top of cell, 1 -> middle of cell
return t * b
else:
def y(t: float) -> float: # 0 -> bottom of cell, 1 -> middle of cell
return (2 - t) * b
# x(t). To get this we first need |y(t)|/b. This is just t since as t goes
# from 0 to 1 y goes from either 0 to b or 0 to -b
if left_quadrants:
def x(t: float) -> float:
xterm = 1 - pow(t, yexp)
return math.floor(cell_width - abs(a * pow(xterm, xexp)) - adjust_x)
else:
def x(t: float) -> float:
xterm = 1 - pow(t, yexp)
return math.ceil(abs(a * pow(xterm, xexp)))
return x, y
@supersampled()
def rounded_corner(buf: SSByteArray, width: int, height: int, level: int = 1, which: str = '╭') -> None:
xfunc, yfunc = rectircle_equations(width, height, buf.supersample_factor, which)
draw_parametrized_curve(buf, width, height, level, xfunc, yfunc)
@supersampled()
def rounded_separator(buf: SSByteArray, width: int, height: int, level: int = 1, left: bool = True) -> None:
gap = thickness(level) * buf.supersample_factor
c1x = find_bezier_for_D(width - gap, height)
start = (0, 0)
end = (0, height - 1)
c1 = c1x, start[1]
c2 = c1x, end[1]
bezier_x, bezier_y = cubic_bezier(start, end, c1, c2)
if left:
draw_parametrized_curve(buf, width, height, level, bezier_x, bezier_y)
else:
mbuf = SSByteArray(width * height)
mbuf.supersample_factor = buf.supersample_factor
draw_parametrized_curve(mbuf, width, height, level, bezier_x, bezier_y)
for y in range(height):
offset = y * width
for src_x in range(width):
dest_x = width - 1 - src_x
buf[offset + dest_x] = mbuf[offset + src_x]
@supersampled()
def spinner(buf: SSByteArray, width: int, height: int, level: int = 1, start: float = 0, end: float = 360) -> None:
w, h = width // 2, height // 2
radius = min(w, h) - int(thickness(level) * buf.supersample_factor) // 2
arc_x, arc_y = circle_equations(w, h, radius, start_at=start, end_at=end)
draw_parametrized_curve(buf, width, height, level, arc_x, arc_y)
def half_dhline(buf: BufType, width: int, height: int, level: int = 1, which: str = 'left', only: Optional[str] = None) -> Tuple[int, int]:
x1, x2 = (0, width // 2) if which == 'left' else (width // 2, width)
gap = thickness(level + 1, horizontal=False)
if only != 'bottom':
draw_hline(buf, width, x1, x2, height // 2 - gap, level)
if only != 'top':
draw_hline(buf, width, x1, x2, height // 2 + gap, level)
return height // 2 - gap, height // 2 + gap
def half_dvline(buf: BufType, width: int, height: int, level: int = 1, which: str = 'top', only: Optional[str] = None) -> Tuple[int, int]:
y1, y2 = (0, height // 2) if which == 'top' else (height // 2, height)
gap = thickness(level + 1, horizontal=True)
if only != 'right':
draw_vline(buf, width, y1, y2, width // 2 - gap, level)
if only != 'left':
draw_vline(buf, width, y1, y2, width // 2 + gap, level)
return width // 2 - gap, width // 2 + gap
def dvline(buf: BufType, width: int, height: int, only: Optional[str] = None, level: int = 1) -> Tuple[int, int]:
half_dvline(buf, width, height, only=only, level=level)
return half_dvline(buf, width, height, only=only, which='bottom', level=level)
def dhline(buf: BufType, width: int, height: int, only: Optional[str] = None, level: int = 1) -> Tuple[int, int]:
half_dhline(buf, width, height, only=only, level=level)
return half_dhline(buf, width, height, only=only, which='bottom', level=level)
def dvcorner(buf: BufType, width: int, height: int, level: int = 1, which: str = '╒') -> None:
hw = 'right' if which in '╒╘' else 'left'
half_dhline(buf, width, height, which=hw)
vw = 'top' if which in '╘╛' else 'bottom'
gap = thickness(level + 1, horizontal=False)
half_vline(buf, width, height, which=vw, extend_by=gap // 2 + thickness(level, horizontal=False))
def dhcorner(buf: BufType, width: int, height: int, level: int = 1, which: str = '╓') -> None:
vw = 'top' if which in '╙╜' else 'bottom'
half_dvline(buf, width, height, which=vw)
hw = 'right' if which in '╓╙' else 'left'
gap = thickness(level + 1, horizontal=True)
half_hline(buf, width, height, which=hw, extend_by=gap // 2 + thickness(level, horizontal=True))
def dcorner(buf: BufType, width: int, height: int, level: int = 1, which: str = '╔') -> None:
hw = 'right' if which in '╔╚' else 'left'
vw = 'top' if which in '╚╝' else 'bottom'
hgap = thickness(level + 1, horizontal=False)
vgap = thickness(level + 1, horizontal=True)
x1, x2 = (0, width // 2) if hw == 'left' else (width // 2, width)
ydelta = hgap if vw == 'top' else -hgap
if hw == 'left':
x2 += vgap
else:
x1 -= vgap
draw_hline(buf, width, x1, x2, height // 2 + ydelta, level)
if hw == 'left':
x2 -= 2 * vgap
else:
x1 += 2 * vgap
draw_hline(buf, width, x1, x2, height // 2 - ydelta, level)
y1, y2 = (0, height // 2) if vw == 'top' else (height // 2, height)
xdelta = vgap if hw == 'right' else -vgap
yd = thickness(level, horizontal=True) // 2
if vw == 'top':
y2 += hgap + yd
else:
y1 -= hgap + yd
draw_vline(buf, width, y1, y2, width // 2 - xdelta, level)
if vw == 'top':
y2 -= 2 * hgap
else:
y1 += 2 * hgap
draw_vline(buf, width, y1, y2, width // 2 + xdelta, level)
def dpip(buf: BufType, width: int, height: int, level: int = 1, which: str = '╟') -> None:
if which in '╟╢':
left, right = dvline(buf, width, height)
x1, x2 = (0, left) if which == '╢' else (right, width)
draw_hline(buf, width, x1, x2, height // 2, level)
else:
top, bottom = dhline(buf, width, height)
y1, y2 = (0, top) if which == '╧' else (bottom, height)
draw_vline(buf, width, y1, y2, width // 2, level)
def inner_corner(buf: BufType, width: int, height: int, which: str = 'tl', level: int = 1) -> None:
hgap = thickness(level + 1, horizontal=True)
vgap = thickness(level + 1, horizontal=False)
vthick = thickness(level, horizontal=True) // 2
x1, x2 = (0, width // 2 - hgap + vthick + 1) if 'l' in which else (width // 2 + hgap - vthick, width)
yd = -1 if 't' in which else 1
draw_hline(buf, width, x1, x2, height // 2 + (yd * vgap), level)
y1, y2 = (0, height // 2 - vgap) if 't' in which else (height // 2 + vgap, height)
xd = -1 if 'l' in which else 1
draw_vline(buf, width, y1, y2, width // 2 + (xd * hgap), level)
def shade(
buf: BufType, width: int, height: int, light: bool = False, invert: bool = False, which_half: str = '', fill_blank: bool = False,
xnum: int = 12, ynum: int = 0,
) -> None:
square_width = max(1, width // xnum)
square_height = max(1, (height // ynum) if ynum else square_width)
number_of_rows = height // square_height
number_of_cols = width // square_width
rows = range(number_of_rows)
cols = range(number_of_cols)
if which_half == 'top':
rows = range(number_of_rows//2)
elif which_half == 'bottom':
rows = range(number_of_rows//2, number_of_rows)
elif which_half == 'left':
cols = range(number_of_cols // 2)
elif which_half == 'right':
cols = range(number_of_cols // 2, number_of_cols)
for r in rows:
for c in cols:
if invert ^ ((r % 2 != c % 2) or (light and r % 2 == 1)):
continue
for yr in range(square_height):
y = r * square_height + yr
offset = width * y
for xc in range(square_width):
x = c * square_width + xc
buf[offset + x] = 255
if not fill_blank:
return
if which_half == 'bottom':
rows = range(height//2)
cols = range(width)
elif which_half == 'top':
rows = range(height//2 - 1, height)
cols = range(width)
elif which_half == 'right':
cols = range(width // 2)
rows = range(height)
elif which_half == 'left':
cols = range(width // 2 - 1, width)
rows = range(height)
for r in rows:
off = r * width
for c in cols:
buf[off + c] = 255
def mask(
mask_func: Callable[[BufType, int, int], None], buf: BufType, width: int, height: int,
) -> None:
m = bytearray(width * height)
mask_func(m, width, height)
for y in range(height):
offset = y * width
for x in range(width):
p = offset + x
buf[p] = int(255.0 * (buf[p] / 255.0 * m[p] / 255.0))
def quad(buf: BufType, width: int, height: int, x: int = 0, y: int = 0) -> None:
num_cols = width // 2
left = x * num_cols
right = width if x else num_cols
num_rows = height // 2
top = y * num_rows
bottom = height if y else num_rows
for r in range(top, bottom):
off = r * width
for c in range(left, right):
buf[off + c] = 255
def sextant(buf: BufType, width: int, height: int, level: int = 1, which: int = 0) -> None:
def draw_sextant(row: int = 0, col: int = 0) -> None:
if row == 0:
y_start, y_end = 0, height // 3
elif row == 1:
y_start, y_end = height // 3, 2 * height // 3
else:
y_start, y_end = 2 * height // 3, height
if col == 0:
x_start, x_end = 0, width // 2
else:
x_start, x_end = width // 2, width
for r in range(y_start, y_end):
off = r * width
for c in range(x_start, x_end):
buf[c + off] = 255
def add_row(q: int, r: int) -> None:
if q & 1:
draw_sextant(r)
if q & 2:
draw_sextant(r, col=1)
add_row(which % 4, 0)
add_row(which // 4, 1)
add_row(which // 16, 2)
@supersampled()
def smooth_mosaic(
buf: SSByteArray, width: int, height: int, level: int = 1,
lower: bool = True, a: Tuple[float, float] = (0, 0), b: Tuple[float, float] = (0, 0)
) -> None:
ax, ay = int(a[0] * (width - 1)), int(a[1] * (height - 1))
bx, by = int(b[0] * (width - 1)), int(b[1] * (height - 1))
line = line_equation(ax, ay, bx, by)
def lower_condition(x: int, y: int) -> bool:
return y >= line(x)
def upper_condition(x: int, y: int) -> bool:
return y <= line(x)
condition = lower_condition if lower else upper_condition
for y in range(height):
offset = width * y
for x in range(width):
if condition(x, y):
buf[offset + x] = 255
def eight_range(size: int, which: int) -> range:
thickness = max(1, size // 8)
block = thickness * 8
if block == size:
return range(thickness * which, thickness * (which + 1))
if block > size:
start = min(which * thickness, size - thickness)
return range(start, start + thickness)
extra = size - block
thicknesses = list(repeat(thickness, 8))
for i in (3, 4, 2, 5, 6, 1, 7, 0): # ensures the thickness of first and last are least likely to be changed
if not extra:
break
extra -= 1
thicknesses[i] += 1
pos = sum(thicknesses[:which])
return range(pos, pos + thicknesses[which])
def eight_bar(buf: BufType, width: int, height: int, level: int = 1, which: int = 0, horizontal: bool = False) -> None:
if horizontal:
x_range = range(0, width)
y_range = eight_range(height, which)
else:
y_range = range(0, height)
x_range = eight_range(width, which)
for y in y_range:
offset = y * width
for x in x_range:
buf[offset + x] = 255
def eight_block(buf: BufType, width: int, height: int, level: int = 1, which: Tuple[int, ...] = (0,), horizontal: bool = False) -> None:
for x in which:
eight_bar(buf, width, height, level, x, horizontal)
def frame(buf: BufType, width: int, height: int, edges: Tuple[Literal['l', 'r', 't', 'b'], ...] = ('l', 'r', 't', 'b'), level: int = 0) -> None:
h = thickness(level=level, horizontal=True)
v = thickness(level=level, horizontal=False)
def line(x1: int, x2: int, y1: int, y2: int) -> None:
for y in range(y1, y2):
offset = y * width
for x in range(x1, x2):
buf[x + offset] = 255
def hline(y1: int, y2: int) -> None:
line(0, width, y1, y2)
def vline(x1: int, x2: int) -> None:
line(x1, x2, 0, height)
if 't' in edges:
hline(0, h + 1)
if 'b' in edges:
hline(height - h - 1, height)
if 'l' in edges:
vline(0, v + 1)
if 'r' in edges:
vline(width - v - 1, width)
def progress_bar(buf: BufType, width: int, height: int, which: Literal['l', 'm', 'r'] = 'l', filled: bool = False, level: int = 1, gap_factor: int = 3) -> None:
if which == 'l':
frame(buf, width, height, edges=('l', 't', 'b'), level=level)
elif which == 'm':
frame(buf, width, height, edges=('t', 'b'), level=level)
else:
frame(buf, width, height, edges=('r', 't', 'b'), level=level)
if not filled:
return
h = thickness(level=level, horizontal=True)
v = thickness(level=level, horizontal=False)
y1 = gap_factor * h
y2 = height - gap_factor*h
if which == 'l':
x1, x2 = gap_factor * v, width
elif which == 'm':
x1, x2 = 0, width
else:
x1, x2 = 0, width - gap_factor*v
for y in range(y1, y2):
offset = y * width
for x in range(x1, x2):
buf[x + offset] = 255
@lru_cache(maxsize=64)
def distribute_dots(available_space: int, num_of_dots: int) -> Tuple[Tuple[int, ...], int]:
dot_size = max(1, available_space // (2 * num_of_dots))
extra = available_space - 2 * num_of_dots * dot_size
gaps = list(repeat(dot_size, num_of_dots))
if extra > 0:
idx = 0
while extra > 0:
gaps[idx] += 1
idx = (idx + 1) % len(gaps)
extra -= 1
gaps[0] //= 2
summed_gaps = tuple(sum(gaps[:i + 1]) for i in range(len(gaps)))
return summed_gaps, dot_size
def braille_dot(buf: BufType, width: int, height: int, col: int, row: int) -> None:
x_gaps, dot_width = distribute_dots(width, 2)
y_gaps, dot_height = distribute_dots(height, 4)
x_start = x_gaps[col] + col * dot_width
y_start = y_gaps[row] + row * dot_height
if y_start < height and x_start < width:
for y in range(y_start, min(height, y_start + dot_height)):
offset = y * width
for x in range(x_start, min(width, x_start + dot_width)):
buf[offset + x] = 255
def braille(buf: BufType, width: int, height: int, which: int = 0) -> None:
if not which:
return
for i, x in enumerate(reversed(bin(which)[2:])):
if x == '1':
q = i + 1
col = 0 if q in (1, 2, 3, 7) else 1
row = 0 if q in (1, 4) else 1 if q in (2, 5) else 2 if q in (3, 6) else 3
braille_dot(buf, width, height, col, row)
box_chars: Dict[str, List[Callable[[BufType, int, int], Any]]] = {
'─': [hline],
'━': [p(hline, level=3)],
'│': [vline],
'┃': [p(vline, level=3)],
'╌': [hholes],
'╍': [p(hholes, level=3)],
'┄': [p(hholes, num=2)],
'┅': [p(hholes, num=2, level=3)],
'┈': [p(hholes, num=3)],
'┉': [p(hholes, num=3, level=3)],
'╎': [vholes],
'╏': [p(vholes, level=3)],
'┆': [p(vholes, num=2)],
'┇': [p(vholes, num=2, level=3)],
'┊': [p(vholes, num=3)],
'┋': [p(vholes, num=3, level=3)],
'╴': [half_hline],
'╵': [half_vline],
'╶': [p(half_hline, which='right')],
'╷': [p(half_vline, which='bottom')],
'╸': [p(half_hline, level=3)],
'╹': [p(half_vline, level=3)],
'╺': [p(half_hline, which='right', level=3)],
'╻': [p(half_vline, which='bottom', level=3)],
'╼': [half_hline, p(half_hline, level=3, which='right')],
'╽': [half_vline, p(half_vline, level=3, which='bottom')],
'╾': [p(half_hline, level=3), p(half_hline, which='right')],
'╿': [p(half_vline, level=3), p(half_vline, which='bottom')],
'': [triangle],
'': [p(half_cross_line, which='tl'), p(half_cross_line, which='bl')],
'': [p(triangle, left=False)],
'': [p(half_cross_line, which='tr'), p(half_cross_line, which='br')],
'': [D],
'': [rounded_separator],
'': [p(D, left=False)],
'': [p(rounded_separator, left=False)],
'': [p(corner_triangle, corner='bottom-left')],
'': [cross_line],
'': [p(corner_triangle, corner='bottom-right')],
'': [p(cross_line, left=False)],
'': [p(corner_triangle, corner='top-left')],
'': [p(cross_line, left=False)],
'': [p(corner_triangle, corner='top-right')],
'': [cross_line],
'': [p(progress_bar, which='l')],
'': [p(progress_bar, which='m')],
'': [p(progress_bar, which='r')],
'': [p(progress_bar, which='l', filled=True)],
'': [p(progress_bar, which='m', filled=True)],
'': [p(progress_bar, which='r', filled=True)],
'': [p(spinner, start=235, end=305)],
'': [p(spinner, start=270, end=390)],
'': [p(spinner, start=315, end=470)],
'': [p(spinner, start=360, end=540)],
'': [p(spinner, start=80, end=220)],
'': [p(spinner, start=170, end=270)],
'═': [dhline],
'║': [dvline],
'╞': [vline, p(half_dhline, which='right')],
'╡': [vline, half_dhline],
'╥': [hline, p(half_dvline, which='bottom')],
'╨': [hline, half_dvline],
'╪': [vline, half_dhline, p(half_dhline, which='right')],
'╫': [hline, half_dvline, p(half_dvline, which='bottom')],
'╬': [p(inner_corner, which=x) for x in 'tl tr bl br'.split()],
'╠': [p(inner_corner, which='tr'), p(inner_corner, which='br'), p(dvline, only='left')],
'╣': [p(inner_corner, which='tl'), p(inner_corner, which='bl'), p(dvline, only='right')],
'╦': [p(inner_corner, which='bl'), p(inner_corner, which='br'), p(dhline, only='top')],
'╩': [p(inner_corner, which='tl'), p(inner_corner, which='tr'), p(dhline, only='bottom')],
'╱': [p(cross_line, left=False)],
'╲': [cross_line],
'╳': [cross_line, p(cross_line, left=False)],
'▀': [p(eight_block, horizontal=True, which=(0, 1, 2, 3))],
'▁': [p(eight_bar, which=7, horizontal=True)],
'▂': [p(eight_block, horizontal=True, which=(6, 7))],
'▃': [p(eight_block, horizontal=True, which=(5, 6, 7))],
'▄': [p(eight_block, horizontal=True, which=(4, 5, 6, 7))],
'▅': [p(eight_block, horizontal=True, which=(3, 4, 5, 6, 7))],
'▆': [p(eight_block, horizontal=True, which=(2, 3, 4, 5, 6, 7))],
'▇': [p(eight_block, horizontal=True, which=(1, 2, 3, 4, 5, 6, 7))],
'█': [p(eight_block, horizontal=True, which=(0, 1, 2, 3, 4, 5, 6, 7))],
'▉': [p(eight_block, which=(0, 1, 2, 3, 4, 5, 6))],