Control Points Output to Curve Mapper (#3994)

* Control Points Output to Curve Mapper

* update docs

docs/nodes/number/curve_mapper.rst

@@ -30,6 +30,8 @@ This node has the following outputs:
   always lying in XOY plane along the OX axis. The domain of the curve is
   defined by **Min X** and **Max X** parameters, which are defined in the curve
   editor widget.
+* **Control Points: Location over the XOY Plane of the control points of the widget.
+  It can be used as a 2D slider.
 
 Examples
 --------
@@ -40,9 +42,8 @@ Basic range remapping:
 
 Using the node to define the column profile:
 
-.. image:: https://raw.githubusercontent.com/vicdoval/sverchok/docs_images/images_for_docs/number/Curve%20Mapper/curve_mapper_sverchok__blender_example_2.png 
+.. image:: https://raw.githubusercontent.com/vicdoval/sverchok/docs_images/images_for_docs/number/Curve%20Mapper/curve_mapper_sverchok__blender_example_2.png
 
 Example of the Curve output usage:
 
 .. image:: https://user-images.githubusercontent.com/284644/80520701-4051d200-89a3-11ea-92fd-2f2f2004e4e7.png
-

nodes/number/curve_mapper.py

@@ -31,7 +31,8 @@
     get_valid_node,
     CURVE_NODE_TYPE,
     set_rgb_curve,
-    get_rgb_curve)
+    get_rgb_curve,
+    get_points_from_curve)
 
 from sverchok.utils.curve import SvScalarFunctionCurve
 
@@ -71,6 +72,7 @@ def sv_init(self, context):
 
         self.outputs.new('SvStringsSocket', "Value")
         self.outputs.new('SvCurveSocket', "Curve")
+        self.outputs.new('SvVerticesSocket', "Control Points")
         _ = get_evaluator(node_group_name, self._get_curve_node_name())
 
 
@@ -111,6 +113,9 @@ def process(self):
             curve = SvScalarFunctionCurve(evaluate)
             curve.u_bounds = (curve_node.mapping.clip_min_x, curve_node.mapping.clip_max_x)
             self.outputs['Curve'].sv_set([curve])
+        if 'Control Points' in self.outputs:
+            points = get_points_from_curve(node_group_name, curve_node_name)
+            self.outputs['Control Points'].sv_set(points)
 
         # no outputs, end early.
         if not outputs['Value'].is_linked:
@@ -138,8 +143,8 @@ def save_to_json(self, node_data: dict):
         node_data['curve_data'] = data_json_str
 
     def sv_copy(self, other):
-        ''' 
-        self: is the new node, other: is the old node 
+        '''
+        self: is the new node, other: is the old node
         by the time this function is called the new node has a new empty n_id
         a new n_id will be generated as a side effect of _get_curve_node_name
         '''

utils/sv_manual_curves_utils.py

@@ -109,7 +109,7 @@ def get_rgb_curve(group_name, node_name):
 
 def set_rgb_curve(data_dict, curve_node_name):
     '''
-    stores RGB Curves data into json 
+    stores RGB Curves data into json
     '''
 
     group_name = data_dict['group_name']
@@ -130,3 +130,18 @@ def set_rgb_curve(data_dict, curve_node_name):
             curve.points[pidx].handle_type = handle_type
             curve.points[pidx].location = location
     node.mapping.update()
+
+def get_points_from_curve(group_name, node_name):
+    '''
+    get control points from curve
+    '''
+    node_groups = bpy.data.node_groups
+    group = node_groups.get(group_name)
+    node = group.nodes.get(node_name)
+
+    out_list = []
+
+    points = node.mapping.curves[-1].points
+    out_list.append([[p.location[0], p.location[1], 0] for p in points])
+
+    return out_list