Feature/ascii interactive

convertToASCII.py

@@ -0,0 +1,45 @@
+from __future__ import division
+from IPython.html.widgets import interactive
+
+from imageUtils import show_image, show_images, get_image_from_url, resize_image, convert_image_to_grayscale, get_image_pixel_data
+from listUtils import join_list_items, add_to_list, reshape_list
+
+ASCII_A = [ '..', '%%', '@@', '??', 'SS', '++', '..', '**', '::', ',,', '..']
+ASCII_B = [ '##', '??', '%%', '..', 'SS', '++', '..', '**', '::', ',,', '@@']
+ASCII_C = [ '##', '??', '%%', '..', 'SS', '++', '..', '**', '::', ',,', '..']
+ASCII_D = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. "
+ASCII_E = ["$$","@@","BB","%%","88","&&","WW","MM","##","**","oo","aa","hh","kk","bb","dd","pp","qq","ww","mm","ZZ","OO","00","QQ","LL","CC","JJ","UU","YY","XX","zz","cc","vv","uu","nn","xx","rr","jj","ff","tt","//","\\","||","((","))","11","{{","}}","[[","]]","??","--","__","++","~~","<<",">>","ii","!!","ll","II",";;","::",",,",'""',"^^","``","''","..","  "]
+
+def get_ascii_for_pixel(pixel_value, ascii_chars):
+    range_width = 256/(len(ascii_chars)-1)
+    ascii_index = int(pixel_value/range_width)
+
+    return ascii_chars[ascii_index]
+
+def make_to_ascii(image_url_path, ascii_chars, new_width=35):
+    # First, get image from URL.
+    image = get_image_from_url(image_url_path)
+
+    # Next, resize image to new width while preserving aspect ratio.
+    (original_width, original_height) = image.size
+    aspect_ratio = original_height/original_width
+    new_height = int(aspect_ratio * new_width)
+    small_image = resize_image(image, (new_width, new_height))
+
+    # Then, make the image grayscale.
+    gray_image = convert_image_to_grayscale(small_image)
+
+    # Let's use the pixel values to map to the ASCII character set of choice.
+    pixels_in_image = list(get_image_pixel_data(gray_image))
+    pixels_to_chars = [get_ascii_for_pixel(pixel_value, ascii_chars) for pixel_value in pixels_in_image]
+
+    # Shape the ASCII list to make the final ASCII image.
+    ascii_width = new_width * len(ascii_chars[0])
+    ascii_art = reshape_list(pixels_to_chars, ascii_width)
+
+    show_images([image, small_image, gray_image])
+    print(ascii_art)
+
+    return ascii_art
+
+convert_image_to_ascii = interactive(make_to_ascii, image_url_path='http://png.clipart.me/previews/a03/puppy-vector-8-39942.jpg', ascii_chars = {'a': ASCII_A, 'b': ASCII_B, 'c': ASCII_C, 'd': ASCII_D, 'e': ASCII_E}, new_width=[20, 50, 5])

imageUtils.py

@@ -17,6 +17,19 @@ def show_image(image):
 
     plt.show()
 
+
+def show_images(images):
+    num_images = len(images)
+    fig, axes = plt.subplots(ncols=num_images)
+    plt.figure(figsize=(3,9))
+    plt.gray()
+
+    for i in range(num_images):
+        axes[i].imshow(images[i])
+        axes[i].axis('off')
+
+    plt.show()
+
 # This function grabs the image from a url so we can change it.
 def get_image_from_url(image_url_path):
     file = cStringIO.StringIO(urllib.urlopen(image_url_path).read())