examples/simple-graph.py

   1 #!/usr/bin/env python
   2
   3 from gi.repository import Gegl
   4 import sys
   5
   6 if __name__ == '__main__':
   7   Gegl.init(sys.argv)
   8
   9   ptn = Gegl.Node()
  10
  11   # Disable caching on all child nodes
  12   ptn.set_property("cache-policy", Gegl.CachePolicy.NEVER)
  13
  14   # Create our background buffer. A gegl:color node would
  15   # make more sense, we just use a buffer here as an example.
  16   background_buffer = Gegl.Buffer.new("RGBA float", 246, -10, 276, 276)
  17   white = Gegl.Color.new("#FFF")
  18   background_buffer.set_color(background_buffer.get_extent(), white)
  19
  20   src = ptn.create_child("gegl:load")
  21   src.set_property("path", "data/surfer.png")
  22
  23   crop = ptn.create_child("gegl:crop")
  24   crop.set_property("x", 256)
  25   crop.set_property("y", 0)
  26   crop.set_property("width", 256)
  27   crop.set_property("height", 256)
  28
  29   buffer_src = ptn.create_child("gegl:buffer-source")
  30   buffer_src.set_property("buffer",background_buffer)
  31
  32   over = ptn.create_child("gegl:over")
  33
  34   dst = ptn.create_child("gegl:save")
  35   dst.set_property("path", "cropped.png")
  36
  37   # The parent node is only for reference tracking, we need to
  38   # connect the node's pads to actualy pass data between them.
  39   buffer_src.connect_to("output", over, "input")
  40   src.connect_to("output", crop, "input")
  41   crop.connect_to("output", over, "aux")
  42   over.connect_to("output", dst, "input")
  43
  44   # Will create "cropped.png" in the current directory
  45   dst.process()
  46