Guides

Guides are a tool to align elements with one another.

Guides consist of a couple of elements: aspects that hook into the item-drag cycle, and a dedicated painter.

>>> from gaphas.view import GtkView
>>> from gaphas.painter import PainterChain, ItemPainter, HandlePainter
>>> from gaphas.tool import item_tool, zoom_tool
>>> from gaphas.guide import GuidePainter
>>> view = GtkView()
>>> view.painter = (
...     PainterChain()
...     .append(ItemPainter(view.selection))
...     .append(HandlePainter(view))
...     .append(GuidePainter(view))
... )
>>> view.add_controller(item_tool())
>>> view.add_controller(zoom_tool())

You need to hook up the GuidePainter. The aspect are loaded as soon as the module is loaded.