def generate_monochrome_image(expression, width=300):
"""Return a grayscale image of the given expression."""
height = width
def convert_coords(x, y):
"""Convert absolute coordinates to relative coords
between (-1, -1) and (1, 1)."""
width_unit = width / 2
height_unit = height / 2
rx = (x - width_unit) / width_unit
ry = (y - height_unit) / height_unit
return (rx, ry)
def scale_intensity(rel_intensity):
"""Convert a relative intensity from [-1, 1] to [0,255]."""
return int(rel_intensity * 127.5 + 127.5)
image = Image.new("L", (width, height))
# Go through each pixel in the image.
# We will convert each coordinate to a coordinate between
# (-1, -1) and (1, 1) before passing it to our expression.
for py in range(height):
for px in range(width):
x, y = convert_coords(px, py)
expr_value = run_expression(expression, x, y)
intensity = scale_intensity(expr_value)
image.putpixel((px, py), intensity)
return image
def generate_monochrome_image(expression, width=300):
"""Return a grayscale image of the given expression."""
height = width
def convert_coords(x, y):
"""Convert absolute coordinates to relative coords
between (-1, -1) and (1, 1)."""
width_unit = width / 2
height_unit = height / 2
rx = (x - width_unit) / width_unit
ry = (y - height_unit) / height_unit
return (rx, ry)
def scale_intensity(rel_intensity):
"""Convert a relative intensity from [-1, 1] to [0,255]."""
return int(rel_intensity * 127.5 + 127.5)
image = Image.new("L", (width, height))
# Go through each pixel in the image.
# We will convert each coordinate to a coordinate between
# (-1, -1) and (1, 1) before passing it to our expression.
for py in range(height):
for px in range(width):
x, y = convert_coords(px, py)
expr_value = run_expression(expression, x, y)
intensity = scale_intensity(expr_value)
image.putpixel((px, py), intensity)
return image