Fix out-of-date documentation

docs/index.rst

@@ -71,7 +71,7 @@ Then, you are ready to read and write gerber files:
 
     from gerbonara import LayerStack
 
-    stack = LayerStack.from_directory('output/gerber')
+    stack = LayerStack.open('output/gerber')
     w, h = stack.outline.size('mm')
     print(f'Board size is {w:.1f} mm x {h:.1f} mm')
 

examples/highlight_outline.py

@@ -10,7 +10,7 @@ from gerbonara.utils import MM
 from gerbonara.utils import rotate_point
 
 def highlight_outline(input_dir, output_dir):
-    stack = LayerStack.from_directory(input_dir)
+    stack = LayerStack.open(input_dir)
 
     outline = []
     for obj in stack.outline.objects:
@@ -28,7 +28,6 @@ def highlight_outline(input_dir, output_dir):
     marker_nx, marker_ny = math.sin(marker_angle), math.cos(marker_angle)
 
     ap = CircleAperture(0.1, unit=MM)
-    stack['top silk'].apertures.append(ap)
 
     for line in outline:
         cx, cy = (line.x1 + line.x2)/2, (line.y1 + line.y2)/2

examples/load_directory.py

@@ -7,5 +7,5 @@ if __name__ == '__main__':
     args = parser.parse_args()
 
     import gerbonara
-    print(gerbonara.LayerStack.from_directory(args.input))
+    print(gerbonara.LayerStack.open(args.input))
 

examples/test_arc_approx.py

@@ -2,6 +2,7 @@
 
 import math
 
+from gerbonara.utils import MM
 from gerbonara.graphic_objects import Arc
 from gerbonara.graphic_objects import rotate_point
 
@@ -22,7 +23,8 @@ def approx_test():
                     x1, y1 = rotate_point(0, -1, start_angle*eps)
                     x2, y2 = rotate_point(x1, y1, sweep_angle*eps*(-1 if clockwise else 1))
                     
-                    arc = Arc(x1+cx, y1+cy, x2+cx, y2+cy, -x1, -y1, clockwise=clockwise, aperture=None, polarity_dark=True)
+                    arc = Arc(x1+cx, y1+cy, x2+cx, y2+cy, -x1, -y1, clockwise=clockwise, aperture=None,
+                              polarity_dark=True, unit=MM)
                     lines = arc.approximate(max_error=max_error)
 
                     print(f'<path style="fill: {color}; stroke: none;" d="M {cx} {cy} L {lines[0].x1} {lines[0].y1}', end=' ')