Allow having no visualization

Also allow visualizing each glyph as it's created, though there's no
code for pausing long enough to see the glyphs. The focus is producing
the TTF quickly, not producing pretty pictures.

Author: rmunn

src/extractpoints.py

@@ -538,6 +538,10 @@ def create_dotted_font(fname):
     else:
         new_font.generate(args.output)
     print "Dotted font created as", args.output
+    if args.visualize:
+        print "Press any key to exit"
+        import visualization
+        visualization.wait_for_keypress(args.em, args.zoom)
 
 def extraction_demo(fname, letter):
     font = silent_fontopen(fname)
@@ -551,12 +555,18 @@ def extraction_demo(fname, letter):
         codepoint = letter
     glyph = font[codepoint]
     glyph.unlinkRef()
-    dots = extract_dots(glyph)
+    dots = extract_dots(glyph, args.visualize)
     print "{} dots found".format(len(dots))
-    wait_for_keypress(args.em, args.zoom)
+    if args.visualize:
+        import visualization
+        visualization.wait_for_keypress(args.em, args.zoom)
 
 def extract_dots(glyph, show_glyph=True):
     global args
+    if args.visualize or show_glyph:
+        from visualization import (
+            setup_screen, draw_all, draw_midlines, red, green, blue, draw_fat_point,
+        )
     layer = glyph.foreground
     polylines = []
     polylines_to_draw = []
@@ -634,13 +644,13 @@ def extract_dots(glyph, show_glyph=True):
             polylinecolor = (blue if args.show_glyph else None),
             trianglecolor = (red if args.show_triangles else None))
     if args.show_lines:
-        draw_midlines(screen, allmidlines, midpoints, emsize = args.em, zoom = args.zoom, polylinecolor = green)
+        draw_midlines(screen, allmidlines, allmidpoints, emsize = args.em, zoom = args.zoom, polylinecolor = green)
     return dots
 
 def copy_glyph(orig_glyph, new_glyph):
     # (new_glyph was created with font.createChar(orig_glyph.encoding)
     new_glyph.glyphname = orig_glyph.glyphname
-    dots = extract_dots(orig_glyph, False)  # TODO: Refactor extract_dots to remove drawing code or make it optional
+    dots = extract_dots(orig_glyph, args.visualize)  # TODO: Refactor extract_dots to remove drawing code or make it optional
     for dot in dots:
         contour = circle_at(dot, size=args.radius)
         new_glyph.foreground += contour
@@ -708,11 +718,7 @@ def parse_args():
     parser.add_argument('-r', '--radius', action = "store", type = float, default = 15, help = "Radius of dots, in em units (default 15)")
     parser.add_argument('-s', '--spacing', action = "store", type = float, default = 6.0, help = "Spacing of dots, as a multiple of dot radius (default 6.0 for 600%%)")
     args = parser.parse_args()
-    if not (args.show_triangles or args.show_lines or args.show_dots):
-        parser.print_help()
-        print
-        print "Error: Please use at least one of the -t, -l or -d options."
-        sys.exit(2)
+    args.visualize = (args.show_triangles or args.show_lines or args.show_dots or args.show_glyph)
     return args
 
 def main():