add support for long lines (one single LED strip)

v2/backend/processing/PixelControl/PixelControl.pyde

@@ -8,7 +8,7 @@ errorCount = 0
 framerate = 30
 dimension = 0 
 
-long_line = False
+long_line = True
 
 ledSerial = None
 data = None
@@ -42,8 +42,13 @@ def serialConfigure(portName):
 
 def image2data(data):
     offset = 3
-    for x in xrange(0, dimension, 1):
-        pixel = [colorWiring(pixels[x]) for i in range(0, 8)]
+    pixel_nb = 0  
+    for x in range(0, height):
+        pixel_line = pixels[pixel_nb:pixel_nb+width]
+        if long_line and pixel_nb/width%2 == 1:
+            pixel_line = reversed(pixel_line)
+        for px in pixel_line:
+            pixel = [colorWiring(px) for i in range(0, 8)]
             imgmask = 0x800000
             while imgmask != 0:
                 b = 0
@@ -53,16 +58,12 @@ def image2data(data):
                 if b > 127:
                     # Convert to signed bytes (expected by jarray)
                     b -= 2**8
-            if long_line:
-                if x/width%2 == 0:
                     data[offset] = b
-                else:
-                    # TODO: write data in the opposite order
-                    pass
                 else:
                     data[offset] = b
                 offset += 1
                 imgmask >>= 1
+            pixel_nb +=1
 
 def colorWiring(c):
     red = (c & 0xFF0000) >> 16