Partial completion of TwoDBoxWithSliders in highD.py

mobject/tex_mobject.py

@@ -80,6 +80,8 @@ class TexMobject(SVGMobject):
         if tex in ["\\over", "\\overline"]:
             #fraction line needs something to be over
             tex += "\\,"
+        if tex == "\\sqrt":
+            tex += "{\\quad}"
         for t1, t2 in ("\\left", "\\right"), ("\\right", "\\left"):
             should_replace = reduce(op.and_, [
                 t1 in tex,

topics/number_line.py

@@ -32,7 +32,7 @@ class NumberLine(VMobject):
 
     def generate_points(self):
         self.main_line = Line(self.x_min*RIGHT, self.x_max*RIGHT)
-        self.tick_marks = VMobject()
+        self.tick_marks = VGroup()
         self.add(self.main_line, self.tick_marks)
         for x in self.get_tick_numbers():
             self.add_tick(x, self.tick_size)

topics/numerals.py

@@ -12,7 +12,7 @@ class DecimalNumber(VMobject):
     }
     def __init__(self, float_num, **kwargs):
         digest_config(self, kwargs)
-        num_string = '%.*f' % (self.num_decimal_points, float_num)
+        num_string = '%.*f'%(self.num_decimal_points, float_num)
         VMobject.__init__(self, *[
             TexMobject(char)
             for char in num_string
@@ -64,7 +64,10 @@ class ChangingDecimal(Animation):
 
     def update_number(self, alpha):
         decimal = self.decimal_number
-        new_decimal = DecimalNumber(self.number_update_func(alpha))
+        new_decimal = DecimalNumber(
+            self.number_update_func(alpha),
+            num_decimal_points = self.num_decimal_points
+        )
         new_decimal.replace(decimal, dim_to_match = 1)
         new_decimal.highlight(decimal.get_color())
         decimal.align_data(new_decimal)