Gimp Script to Help Make Rotating Brushes

Just start with an image oriented in the "drawing upwards" direction:

and run the script. With the defaults it will create a new image having all the rotated copies:

Now save it as a .gih in your brush folder, and refresh the brush list.

Save Brush Dialog

Here is a sample drawing with this brush. The right squiggle uses tablet pressure sensitivity to change the size.

Example

You have to start with a square for each brush image, but the script only rotates a circle, so try to keep the image inside a circle that would fill the square canvas to avoid clipping. To make a colour (RGB) brush, start with a RGBA image with transparency, and check off the option in the dialog. For a normal brush, start with a greyscale image with no alpha. White will end up transparent, black will be opaque and greys will end up partially transparent.

It will also rotate multiple images if you start with them stacked vertically, and tell the script how many images you have:

Start with this

End up with this!

Here is how to set up the save dialog to follow the angle and alternate between the rows when drawing:

Save Dialog

and a sample. (I toggled on "Use Color from Gradient" in the paint tool dialog in the lower half)...

Hope the script is useful for someone You can download it here!