generate sprite from images

generator

@@ -21,7 +21,7 @@ Options:
 from docopt import docopt
 from moviepy.editor import VideoFileClip
 from PIL import Image
-import glob, os, random, sys
+import glob, os, random, sys, shutil
 
 
 TMP_FRAMES_PATH="/tmp/frames/"
@@ -33,7 +33,10 @@ def generate_video_thumbnail(args):
     outputPrefix = get_output_prefix()
 
     generate_frames(videoFileClip, interval, outputPrefix, size)
-#    generate_sprite_from_images()
+
+    columns = int(args['<columns>'])
+    output = args['<output>']
+    generate_sprite_from_images(outputPrefix, columns, size, output)
 
 def generate_frames(videoFileClip, interval, outputPrefix, size):
     print "Extracting", int(videoFileClip.duration / interval), "frames (prefix:" + outputPrefix + ")"
@@ -41,8 +44,6 @@ def generate_frames(videoFileClip, interval, outputPrefix, size):
         extract_frame(videoFileClip, i, outputPrefix, size)
     print "Frames extracted."
 
-#    framesMap = sorted(glob.glob(outputPrefix + "*.png"))
-#    images = [Image.open(filename) for filename in framesMap]
 
 def extract_frame(videoFileClip, moment, outputPrefix, size):
     sys.stdout.write(".")
@@ -52,11 +53,30 @@ def extract_frame(videoFileClip, moment, outputPrefix, size):
     resize_image(output, size)
 
 def resize_image(filename, size):
-    sys.stdout.write("*")
-    sys.stdout.flush()
     image = Image.open(filename)
-    image.thumbnail(size, Image.ANTIALIAS)
+    image.resize(size, Image.ANTIALIAS)
-    image.save(filename, "PNG")
+    image.save(filename)
+
+def generate_sprite_from_images(framesPath, columns, size, output):
+    framesMap = sorted(glob.glob(framesPath + "*.png"))
+    images = [Image.open(filename) for filename in framesMap]
+    print "%d frames will be combined." % len(images)
+    masterWidth = size[0] * columns
+    masterHeight = size[1] * len(images) / columns
+    finalImage = Image.new(mode='RGBA', size=(masterWidth, masterHeight), color=(0,0,0,0))
+    merge_frames(images, finalImage, columns, size, output)
+
+def merge_frames(images, finalImage, columns, size, output):
+    for i, image in enumerate(images):
+        for j in range(0, columns):
+            locationX = size[0] * j
+            locationY = size[1] * i
+            finalImage.paste(image, (locationX, locationY))
+
+    finalImage.save(output, transparency=0)
+    shutil.rmtree(TMP_FRAMES_PATH, ignore_errors=True)
+    print "Saved!"
+
 
 def get_output_prefix():
     if not os.path.exists(TMP_FRAMES_PATH):