GEGL graph to fill a layer with a rotated pattern

[tmanni]

Considere this 400x300 image:

   

The common way to do this in gimp is :
- create a 800x600 layer (double size compared to image canvas)
- fill it with Filters > Render > Pattern > Checkerboard
- use the unified transform tool to rotate and translate the layer
- crop the layer to the image size

Now with GEGL graph:
- create a 400x300 layer
- run Filters > Generic > GEGL graph and copy paste the text below in the pipeline field

Code:

checkerboard
 x=25
 y=25
 color1=maroon
 color2=silver

rotate
 degrees=45
 origin-x=200
 origin-y=150

Et voilà!

Note that the indentation is only for better visualisation, it is not needed, all can be writen in one line

Code:

checkerboard x=25 y=25 color1=maroon color2=silver rotate degrees=45 origin-x=200 origin-y=150

Another example:
   

Code:

color value=yellow

over
 aux=[

   grid
     x=64
     line-width=32
     line-height=0
     line-color=black

  rotate
     degrees=45
 ]