SN Functor B¶
“ScriptNode Functor Version B” is an implementation of a script node, which is better described by the examples in the thread where this node was developed. This node is not used generally, because it is not entirely a completed project with respect to how it is syntactically controlled.
The rational behind this node is that the code that implements the node “behind the scenes” is relatively simple, has little error checking, and relatively easy to maintain and augment. The downside is that it, unlike SNLite nodes, has a more verbose initialization syntax. See the code below.
here’s an example snippet:
import sverchok
from sverchok.utils.geom import arc_slice
def functor_init(self, context):
inew = self.inputs.new
inew("SvStringsSocket", "outer radius").prop_name = "float_01"
inew("SvStringsSocket", "inner radius").prop_name = "float_02"
inew("SvStringsSocket", "angle").prop_name = "float_03"
inew("SvStringsSocket", "phase").prop_name = "float_04"
self.outputs.new("SvVerticesSocket", "verts")
self.outputs.new("SvStringsSocket", "edges")
self.outputs.new("SvStringsSocket", "faces")
def draw_buttons(self, context, layout):
pass
def process(self):
outer_radius = self.inputs['outer radius'].sv_get()[0][0]
inner_radius = self.inputs['inner radius'].sv_get()[0][0]
phase = self.inputs['phase'].sv_get()[0][0]
angle = self.inputs['angle'].sv_get()[0][0]
geom = arc_slice(outer_radius=outer_radius, inner_radius=inner_radius, phase=phase, angle=angle)
for idx, data in enumerate(geom):
self.outputs[idx].sv_set([data])
the functor_init function is where you add sockets and set attributes of those sockets, much like coding regular sverchok nodes.
the draw_buttons is optional, and is called by the baseclass.
the process function is performed whenever the node is told to update, to understand when this happens you should read up on how Sverchok implements the update mechanism.