def line(x1, y1, x2, y2):
"""Returns the coords of the line between (x1, y1), (x2, y2)
:param x1: x coordinate of the startpoint
:param y1: y coordinate of the startpoint
:param x2: x coordinate of the endpoint
:param y2: y coordinate of the endpoint
"""
x1 = normalize(x1)
y1 = normalize(y1)
x2 = normalize(x2)
y2 = normalize(y2)
xdiff = max(x1, x2) - min(x1, x2)
ydiff = max(y1, y2) - min(y1, y2)
xdir = 1 if x1 <= x2 else -1
ydir = 1 if y1 <= y2 else -1
r = max(xdiff, ydiff)
for i in range(r+1):
x = x1
y = y1
if ydiff:
y += (float(i) * ydiff) / r * ydir
if xdiff:
x += (float(i) * xdiff) / r * xdir
yield (x, y)
def set(self, x, y):
"""Set a pixel of the :class:`Canvas` object.
:param x: x coordinate of the pixel
:param y: y coordinate of the pixel
"""
x = normalize(x)
y = normalize(y)
col, row = get_pos(x, y)
if type(self.chars[row][col]) != int:
return
self.chars[row][col] |= pixel_map[y % 4][x % 2]
def toggle(self, x, y):
"""Toggle a pixel of the :class:`Canvas` object.
:param x: x coordinate of the pixel
:param y: y coordinate of the pixel
"""
x = normalize(x)
y = normalize(y)
col, row = get_pos(x, y)
if type(self.chars[row][col]) != int or self.chars[row][col] & pixel_map[y % 4][x % 2]:
self.unset(x, y)
else:
self.set(x, y)
def unset(self, x, y):
"""Unset a pixel of the :class:`Canvas` object.
:param x: x coordinate of the pixel
:param y: y coordinate of the pixel
"""
x = normalize(x)
y = normalize(y)
col, row = get_pos(x, y)
if type(self.chars[row][col]) == int:
self.chars[row][col] &= ~pixel_map[y % 4][x % 2]
if type(self.chars[row][col]) != int or self.chars[row][col] == 0:
del(self.chars[row][col])
if not self.chars.get(row):
del(self.chars[row])
def get(self, x, y):
"""Get the state of a pixel. Returns bool.
:param x: x coordinate of the pixel
:param y: y coordinate of the pixel
"""
x = normalize(x)
y = normalize(y)
dot_index = pixel_map[y % 4][x % 2]
col, row = get_pos(x, y)
char = self.chars.get(row, {}).get(col)
if not char:
return False
if type(char) != int:
return True
return bool(char & dot_index)