def binarySearch(minimum, maximum):
if minimum == maximum:
return minimum
mid = (maximum + minimum) / 2
small = (max(mid - 1,minimum) + minimum) / 2
large = (min(mid + 1,maximum) + maximum) / 2
test = abs(image_y / fontImageSize(mid)[1] - aim)
test_small = abs(image_y / fontImageSize(small)[0] - aim)
test_large = abs(image_y / fontImageSize(large)[0] - aim)
best = min(test, test_small, test_large)
if best == test_small:
return binarySearch(minimum, max(minimum,mid -1))
elif best == test_large:
return binarySearch(min(mid+1, maximum), maximum)
else: #we might not be at the optimal
return binarySearch(small, large)
def genart(self, raw_image):
"""
Interface function
"""
image = Image.open(StringIO.StringIO(raw_image)).convert('L')
font_size = self.searchFontSize(image)
font_image_size = fontImageSize(font_size)
symbol_memo = self.fontSymbols(font_size)
#we'll ignore the parts that don't fit a full size font for now
maxGrid = [x / y for (x, y) in zip(image.size, font_image_size)]
if (len([True for x in maxGrid if x == 0]) > 0):
return "This image is too small" #temporary way of handling small images
#we distribute unused region to all sides
startpos = [ (x - y * z) / 2 for (x, y, z) in zip(image.size, font_image_size, maxGrid)]
ascii_map = ""
#i is height, j is width
for i in range(maxGrid[1]):
row = ""
for j in range(maxGrid[0]):
upper_left = (j * font_image_size[0] + startpos[0], i * font_image_size[1] + startpos[1])
b = image.crop((upper_left[0], upper_left[1], upper_left[0] + font_image_size[0], upper_left[1] + font_image_size[1]))
row = row + self.KNN(b, symbol_memo)
ascii_map = ascii_map + row + '\n'
return ascii_map
