node_VectorMath2.py

# BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
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#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# END GPL LICENSE BLOCK #####

import bpy
from node_s import *
from util import *
from mathutils import Vector, Matrix
from bpy.props import EnumProperty, StringProperty

scalar_out = {
    "DOT":          (lambda u, v: u.dot(v), 2),
    "DISTANCE":     (lambda u, v: (u - v).length, 2),
    "LEN":          (lambda u: u.length, 1),
    "ANGLE":        (lambda u, v: u.angle(v, 0), 2),
}

vector_out = {
    "CROSS":        (lambda u, v: u.cross(v), 2),
    "ADD":          (lambda u, v: u + v, 2),
    "SUB":          (lambda u, v: u - v, 2),
    "NORMALIZE":    (lambda u: u.normalized(), 1),
    "NEG":          (lambda u: -u, 1),
    "REFLECT":      (lambda u, v: u.reflect(v), 2),
    "PROJECT":      (lambda u, v: u.project(v), 2),
    "SCALAR":       (lambda u, s: u * s, 2),
    "1/SCALAR":     (lambda u, s: u * (1/s), 2),
}


class VectorMath2Node(Node, SverchCustomTreeNode):

    ''' VectorMath 2 Node '''
    bl_idname = 'VectorMath2Node'
    bl_label = 'Vector Math 2'
    bl_icon = 'OUTLINER_OB_EMPTY'

    # vector math functions
    mode_items = [
        ("CROSS",       "Cross product",        "", 0),
        ("DOT",         "Dot product",          "", 1),
        ("ADD",         "Add",                  "", 2),
        ("SUB",         "Sub",                  "", 3),
        ("LEN",         "Length",               "", 4),
        ("DISTANCE",    "Distance",             "", 5),
        ("NORMALIZE",   "Normalize",            "", 6),
        ("NEG",         "Negate",               "", 7),
        ("ANGLE",       "Angle",                "", 12),
        ("PROJECT",     "Project",              "", 13),
        ("REFLECT",     "Reflect",              "", 14),
        ("SCALAR",      "Multiply Scalar",      "", 15),
        ("1/SCALAR",    "Multiply 1/Scalar",    "", 16)
    ]

    items_ = EnumProperty(
        items=mode_items,
        name="Function",
        description="Function choice",
        default="CROSS", update=updateNode)

    # matches default of CROSS product
    current_op = StringProperty(default="CROSS")
    scalar_output_socket = False

    def draw_buttons(self, context, layout):
        layout.prop(self, "items_", "Functions:")

    def init(self, context):
        self.inputs.new('VerticesSocket', "U", "u")
        self.inputs.new('VerticesSocket', "V", "v")
        self.outputs.new('VerticesSocket', "W", "W")

    def update_outputs_and_inputs(self):
        '''
        Reaches here only if operation is different from current op
        '''
        inputs = self.inputs
        outputs = self.outputs
        operation = self.items_
        current_op = self.current_op
        scalars = ["SCALAR", "1/SCALAR"]

        # check and adjust outputs and input size
        if operation in scalar_out:
            self.scalar_output_socket = True
            nrInputs = scalar_out[operation][1]
            if 'W' in outputs:
                outputs.remove(outputs['W'])
                outputs.new('StringsSocket', "out", "out")

        else:
            self.scalar_output_socket = False
            nrInputs = vector_out[operation][1]
            if 'out' in outputs:
                outputs.remove(outputs['out'])
                outputs.new('VerticesSocket', "W", "W")

        '''
        this monster removes and adds sockets depending on what kind of switch
        between operations is made, some operation changes require addition of sockets
        others require deletion or replacement.
        '''
        if (operation in scalars) and (current_op in scalars):
            return  # it's OK nothing to change

        add_scalar_input = lambda: inputs.new('StringsSocket', "S", "s")
        add_vector_input = lambda: inputs.new('VerticesSocket', "V", "v")
        remove_last_input = lambda: inputs.remove(inputs[-1])

        ''' reaches this point, means it needs to rewire '''
        if nrInputs < len(inputs):
            remove_last_input()

        elif nrInputs > len(inputs):
            if (operation in scalars):
                add_scalar_input()
            else:
                add_vector_input()

        else:  # nr inputs == len(inputs)
            if nrInputs == 1:
                # is only ever a vector u
                return

            if operation in scalars:
                remove_last_input()
                add_scalar_input()
            elif (current_op in scalars):
                remove_last_input()
                add_vector_input()

        # this is sad.
        if len(inputs) > 2:
            print("found three removed last")
            # remove_last_input()

        # at this point all combos are handled.

    def nothing_to_process(self):
        inputs = self.inputs
        outputs = self.outputs

        if not (('out' in outputs) or ('W' in outputs)):
            return True

        if not outputs[0].links:
            return True

        # if len(inputs) == 0:
        #     return True

        # for i in range(2):
        #     if (len(inputs) == i+1) and not inputs[i].links:
        #         return True

    def update(self):

        '''
        because we want to show socket-type changes even when
        no processing needs to be done, we detect if we need
        to modify sockets before returning early.
        '''
        inputs = self.inputs
        outputs = self.outputs
        operation = self.items_
        self.label = self.items_
        scalars = ["SCALAR", "1/SCALAR"]

        # has it changed since setting it last?
        if not (operation == self.current_op):
            self.update_outputs_and_inputs()
            self.current_op = operation

        # no output or full input ?
        if self.nothing_to_process():
            return

        # this input is shared over both.
        vector1 = []
        if 'U' in inputs and inputs['U'].links:
            if isinstance(inputs['U'].links[0].from_socket, VerticesSocket):
                vector1 = SvGetSocketAnyType(self, inputs['U'])

        if not vector1:
            return

        # reaches here only if we have vector1
        u = vector1
        leve = levelsOflist(u)

        # vector-output
        if 'W' in outputs and outputs['W'].links:

            func = vector_out[operation][0]
            vector2, scalar1, result = [], [], []

            # get
            if 'V' in inputs and inputs['V'].links:
                if isinstance(inputs['V'].links[0].from_socket, VerticesSocket):
                    vector2 = SvGetSocketAnyType(self, inputs['V'])

            elif 'S' in inputs and inputs['S'].links:
                if isinstance(inputs['S'].links[0].from_socket, StringsSocket):
                    scalar1 = SvGetSocketAnyType(self, inputs['S'])

            if len(inputs) == 1:
                try:
                    result = self.recurse_fx(u, func, leve - 1)
                except:
                    print(self.name, 'one input only, failed')

            elif len(inputs) == 2:
                if operation in scalars:
                    try:
                        result = self.recurse_fxy2(u, scalar1, func, leve - 1)
                    except:
                        print(self.name, 'two inputs, scalar, failed')

                else:
                    try:
                        result = self.recurse_fxy(u, vector2, func, leve - 1)
                    except:
                        print(self.name, 'two inputs, non-scalar, failed')

            SvSetSocketAnyType(self, 'W', result)

        # scalar-output
        elif 'out' in outputs and outputs['out'].links:

            func = scalar_out[operation][0]
            vector2, result = [], []

            if 'V' in inputs and inputs['V'].links:
                if isinstance(inputs['V'].links[0].from_socket, VerticesSocket):
                    vector2 = SvGetSocketAnyType(self, inputs['V'])

            if len(inputs) == 1:
                try:
                    result = self.recurse_fx(u, func, leve - 1)
                except:
                    print(self.name)

            elif len(inputs) == 2:
                try:
                    result = self.recurse_fxy(u, vector2, func, leve - 1)
                except:
                    print(self.name)

            SvSetSocketAnyType(self, 'out', result)

    # apply f to all values recursively
    def recurse_fx(self, l, f, leve):
        if not leve:
            w = f(Vector(l))
            if self.scalar_output_socket:
                return w
            else:
                return w.to_tuple()
        else:
            t = []
            for i in l:
                t.append(self.recurse_fx(i, f, leve - 1))
        return t

    # match length of lists,
    # taken from mathNode
    def recurse_fxy(self, l1, l2, f, leve):
        if not leve:
            w = f(Vector(l1), Vector(l2))
            if self.scalar_output_socket:
                return w
            else:
                return w.to_tuple()
        else:
            max_obj = max(len(l1), len(l2))
            fullList(l1, max_obj)
            fullList(l2, max_obj)
            res = []
            for i in range(len(l1)):
                res.append(self.recurse_fxy(l1[i], l2[i], f, leve - 1))
            return res

    # match length of lists, -- this to deal wih vector*scalar only
    # taken from mathNode
    def recurse_fxy2(self, l1, l2, f, leve):
        if not leve:
            w = f(Vector(l1), l2)
            return w.to_tuple()
        else:
            max_obj = max(len(l1), len(l2))
            fullList(l1, max_obj)
            fullList(l2, max_obj)
            res = []
            for i in range(len(l1)):
                res.append(self.recurse_fxy2(l1[i], l2[i], f, leve - 1))
            return res

    def update_socket(self, context):
        self.update()


def register():
    bpy.utils.register_class(VectorMath2Node)


def unregister():
    bpy.utils.unregister_class(VectorMath2Node)

if __name__ == "__main__":
    register()