changing single() to space() for empty mark characters

asciiWriter/examples/image_random_char.py

@@ -16,8 +16,8 @@ image_pattern = image(image_path)
 # Set the marker, in this case it makes a random selection from
 # the list: +, *, $, #, , 
 mark = random(['+', '*', '$', '#', ' ', ' '])
-# Define what to use on a blank space, as a variation you coul use: single('*')
-blank = single()
+# Define what to use on a blank space, as a variation you could use: single('*')
+blank = space()
 
 # Make a canvas
 lines = make_lines(width, height)

asciiWriter/examples/image_rotate.py

@@ -22,7 +22,7 @@ image_pattern = image(image_path)
 # Set the marker, in this case a sentence
 mark = sentence('ASCII ')
 # Define what to use on a blank space, as a variation you coul use: single('*')
-blank = single(' ')
+blank = space()
 
 # Make a canvas
 lines = make_lines(width, height)

asciiWriter/examples/repeated_sinus_amplitude_variation.py

@@ -21,7 +21,7 @@ for amplitude in range(-40, 50, 10):
   # We use a sentence to draw the text
   mark = sentence('VARIA-')
   # Define a blank character
-  blank = space('-')
+  blank = single('-')
 
   # Make the canvas
   lines = make_lines(width, height)

asciiWriter/examples/sinus.py

@@ -15,7 +15,7 @@ pattern = sinus_vertical(period=40, amplitude=30)
 # We use a sentence to draw the text
 mark = sentence('OPEN DESIGN COURSE ')
 # Define a blank character
-blank = single(' ')
+blank = single('-')
 
 # Make the canvas
 lines = make_lines(width, height)