Port diameter node.

a9cd356d · Ilya Portnov · ed549f19 · a9cd356d · a9cd356d
--- a/docs/nodes/analyzers/diameter.rst
+++ b/docs/nodes/analyzers/diameter.rst
+Diameter
+========
+
+Functionality
+-------------
+
+This node calculates the diameter of input set of vertices.
+
+It can calculate diameter in two ways:
+
+* General diameter, i.e. maximum distance between any two vertices from input set.
+* Diameter along specified direction (axis), i.e. the length of the projection
+  of whole input vertices set to specified direction.
+
+Inputs
+------
+
+This node has the following inputs:
+
+* **Vertices** - vertices to calculate diameter of. This input is mandatory for the node to function.
+* **Direction** - direction, along which diameter should be calculated. If this
+  input is not connected, then the node will calculate "general diameter" of
+  input vertices set.
+
+Outputs
+-------
+
+This node has one output: **Diameter** - calculated diameter of vertices set.
+
+Examples of usage
+-----------------
+
+Suzanne has "general diameter" of 2.73:
+
+.. image:: https://user-images.githubusercontent.com/284644/58649984-03aad000-8327-11e9-90b8-0c39f328402a.png
+
+Diameter of Suzanne along some diagonal direction is 2.44. Here the direction
+is drawn as green line, and the projection of Suzanne to that direction is
+marked with red dots:
+
+.. image:: https://user-images.githubusercontent.com/284644/58649983-03aad000-8327-11e9-852a-a75d8eb4aad4.png
+
--- a/nodes/analyzer/diameter.py
+++ b/nodes/analyzer/diameter.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.
+#
+#  This program is distributed in the hope that it will be useful,
+#  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.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+from itertools import product
+
+import bpy
+
+from sverchok.node_tree import SverchCustomTreeNode
+from sverchok.data_structure import updateNode, match_long_repeat
+from sverchok.utils.geom import diameter
+
+class SvDiameterNode(bpy.types.Node, SverchCustomTreeNode):
+    """
+    Triggers: Diameter
+    Tooltip: Calculate diameter of input object
+    """
+
+    bl_idname = 'SvDiameterNode'
+    bl_label = "Diameter"
+    bl_icon = 'ARROW_LEFTRIGHT'
+
+    def sv_init(self, context):
+        self.inputs.new('VerticesSocket', 'Vertices')
+        self.inputs.new('VerticesSocket', 'Direction')
+        self.outputs.new('StringsSocket', 'Diameter')
+
+    def process(self):
+        if not self.inputs['Vertices'].is_linked:
+            return
+        if not any(s.is_linked for s in self.outputs):
+            return
+        
+        any_direction = not self.inputs['Direction'].is_linked
+
+        out_results = []
+
+        vertices_s = self.inputs['Vertices'].sv_get(default=[[]])
+        directions_s = self.inputs['Direction'].sv_get(default=[[]])
+        objects = match_long_repeat([vertices_s, directions_s])
+
+        for vertices, directions in zip(*objects):
+            if any_direction:
+                direction = None
+            else:
+                direction = directions[0]
+            diam = diameter(vertices, direction)
+            out_results.append([diam])
+
+        self.outputs['Diameter'].sv_set(out_results)
+
+
+def register():
+    bpy.utils.register_class(SvDiameterNode)
+
+def unregister():
+    bpy.utils.unregister_class(SvDiameterNode)
+