old_contents: from vispy import app
  import sys
  from vispy.scene import SceneCanvas
  from vispy.scene.visuals import Polygon, Ellipse, Rectangle, RegularPolygon
  from vispy.color import Color
  
  white = Color("#ecf0f1")
  gray = Color("#121212")
  red = Color("#e74c3c")
  blue = Color("#2980b9")
  orange = Color("#e88834")
  
  if __name__ == '__main__':
      canvas = SceneCanvas(keys='interactive', title='Polygon Example',
                           show=True)
      v = canvas.central_widget.add_view()
      v.bgcolor = gray
      v.camera = 'panzoom'
  
      cx, cy = (0.2, 0.2)
      halfx, halfy = (0.1, 0.1)
  
      poly_coords = [(cx - halfx, cy - halfy),
                     (cx + halfx, cy - halfy),
                     (cx + halfx, cy + halfy),
                     (cx - halfx, cy + halfy)]
      poly = Polygon(poly_coords, color=red, border_color=white,
                     border_width=3,  parent=v.scene)
  
      ellipse = Ellipse(center=(0.4, 0.2), radius=(0.1, 0.05),
                        color=blue, border_width=2, border_color=white,
                        num_segments=1,
                        parent=v.scene)
  
      ellipse.num_segments = 10
      ellipse.start_angle = 0
      ellipse.span_angle = 120
  
      rect = Rectangle(center=(0.6, 0.2), width=0.1, height=0.2,
                       color=orange, border_width=2, border_color=white,
                       radius=0.02, parent=v.scene)
  
      regular_poly = RegularPolygon(center=(0.8, 0.2),
                                    radius=0.1, sides=6, color=blue,
                                    border_color=white, border_width=2,
                                    parent=v.scene)
  
      if sys.flags.interactive != 1:
          app.run()
  
new_contents: from vispy import app
  import sys
  from vispy.scene import SceneCanvas
  from vispy.scene.visuals import Polygon, Ellipse, Rectangle, RegularPolygon
  from vispy.color import Color
  
  white = Color("#ecf0f1")
  gray = Color("#121212")
  red = Color("#e74c3c")
  blue = Color("#2980b9")
  orange = Color("#e88834")
  
  if __name__ == '__main__':
      canvas = SceneCanvas(keys='interactive', title='Polygon Example',
                           show=True)
      v = canvas.central_widget.add_view()
      v.bgcolor = gray
      v.camera = 'panzoom'
  
      cx, cy = (0.2, 0.2)
      halfx, halfy = (0.1, 0.1)
  
      poly_coords = [(cx - halfx, cy - halfy),
                     (cx + halfx, cy - halfy),
                     (cx + halfx, cy + halfy),
                     (cx - halfx, cy + halfy)]
      poly = Polygon(poly_coords, color=red, border_color=white,
                     border_width=3,  parent=v.scene)
  
      ellipse = Ellipse(center=(0.4, 0.2), radius=(0.1, 0.05),
                        color=blue, border_width=2, border_color=white,
                        num_segments=1,
                        parent=v.scene)
  
      ellipse.num_segments = 10
      ellipse.start_angle = 0
      ellipse.span_angle = 120
  
      rect = Rectangle(center=(0.6, 0.2), width=0.1, height=0.2,
                       color=orange, border_color=white,
                       radius=0.02, parent=v.scene)
  
      regular_poly = RegularPolygon(center=(0.8, 0.2),
                                    radius=0.1, sides=6, color=blue,
                                    border_color=white, border_width=2,
                                    parent=v.scene)
  
      if sys.flags.interactive != 1:
          app.run()
  
subject: update example