old_contents: # -----------------------------------------------------------------------------
  # Copyright (c) 2009-2016 Nicolas P. Rougier. All rights reserved.
  # Distributed under the (new) BSD License.
  # -----------------------------------------------------------------------------
  import re
  import numpy as np
  from glumpy import app, gl, data, svg, collections
  from glumpy.transforms import Position, OrthographicProjection, PanZoom, Viewport
  
  
  window = app.Window(800, 800, color=(1,1,1,1))
  transform = PanZoom(OrthographicProjection(Position()))
  
  
  @window.event
  def on_draw(dt):
      window.clear()
      paths["antialias"] = -0.5
      collections.Collection.draw(paths)
      paths["antialias"] = +1.0
      collections.Collection.draw(paths)
  
  @window.event
  def on_init():
      gl.glEnable(gl.GL_DEPTH_TEST)
  
  
  paths = collections.PathCollection("agg+", transform=transform)
  paths["miter_limit"] = 4.0
  paths["linewidth"] = 50.0
  paths["color"] = 0.0,0.0,0.0,0.5
  
  path = svg.Path("""M 300,400
                     c   0,100  200,-100  200,0
                     c   0,100 -200,-100 -200,0 z""")
  vertices, closed = path.vertices[0]
  paths.append(vertices, closed=closed)
  
  window.attach(paths["transform"])
  window.attach(paths["viewport"])
  app.run()
  
new_contents: # -----------------------------------------------------------------------------
  # Copyright (c) 2009-2016 Nicolas P. Rougier. All rights reserved.
  # Distributed under the (new) BSD License.
  # -----------------------------------------------------------------------------
  import re
  import numpy as np
  from glumpy import app, gl, data, svg, collections
  from glumpy.transforms import Position, OrthographicProjection, PanZoom, Viewport
  
  
  window = app.Window(800, 800, color=(1,1,1,1))
  transform = PanZoom(OrthographicProjection(Position()))
  
  
  @window.event
  def on_draw(dt):
      window.clear()
      paths["antialias"] = -0.5
      collections.Collection.draw(paths)
      paths["antialias"] = +1.0
      collections.Collection.draw(paths)
  
  @window.event
  def on_init():
      gl.glEnable(gl.GL_DEPTH_TEST)
  
  
  paths = collections.PathCollection("agg", transform=transform)
  # paths["miter_limit"] = 4.0
  paths["linewidth"] = 50.0
  paths["color"] = 0.0,0.0,0.0,0.5
  
  path = svg.Path("""M 300,400
                     c   0,100  200,-100  200,0
                     c   0,100 -200,-100 -200,0 z""")
  vertices, closed = path.vertices[0]
  paths.append(vertices, closed=closed)
  
  window.attach(paths["transform"])
  window.attach(paths["viewport"])
  app.run()
  
subject: Switch back the good agg version (instead of agg+)