fix(extra): Add support for previewing legend in multiple viewports

Resolves #388

Author: chriswmackey

ladybug_grasshopper/icon/LB Preview VisualizationSet.png

@@ -1,5 +1,5 @@
 {
-  "version": "1.9.0", 
+  "version": "1.9.1", 
   "nickname": "VisSet", 
   "outputs": [
     [
@@ -42,7 +42,7 @@
       "default": null
     }, 
     {
-      "access": "item", 
+      "access": "list", 
       "name": "viewport_", 
       "description": "Text for the name of the Rhino viewport to which the 2D screen-oriented\nlegend will be rendered. If unspecified, the 2D legend will be rendered\nin all viewports. Acceptable inputs include:\n-\nPerspective\nTop\nBottom\nLeft\nRight\nFront\nBack\nany view name that has been saved within the Rhino file", 
       "type": "string", 

ladybug_grasshopper/json/LB_Preview_VisualizationSet.json

@@ -68,12 +68,12 @@ def __init__(self):
         super(MyComponent,self).__init__()
         self.vis_con = None
         self.vs_goo = None
-        self.viewport = None
+        self.viewport = ()
 
     def RunScript(self, _vis_set, legend_par_, leg_par2d_, data_set_, viewport_):
         ghenv.Component.Name = 'LB Preview VisualizationSet'
         ghenv.Component.NickName = 'VisSet'
-        ghenv.Component.Message = '1.9.0'
+        ghenv.Component.Message = '1.9.1'
         ghenv.Component.Category = 'Ladybug'
         ghenv.Component.SubCategory = '4 :: Extra'
         ghenv.Component.AdditionalHelpFromDocStrings = '1'
@@ -179,11 +179,11 @@ def RunScript(self, _vis_set, legend_par_, leg_par2d_, data_set_, viewport_):
                                     geo.active_data = i
             self.vis_con = VisualizationSetConverter(vis_set_obj, leg3d, leg2d)
             self.vs_goo = VisSetGoo(vis_set_obj)
-            self.viewport = viewport_
+            self.viewport = tuple(vp.lower() for vp in viewport_)
         else:
             self.vis_con = None
             self.vs_goo = None
-            self.viewport = None
+            self.viewport = ()
 
         # return the bake-able version of the visualization set 
         return self.vs_goo
@@ -225,8 +225,7 @@ def DrawViewportWires(self, args):
                     display.DrawCone(*draw_args)
                 for draw_args in self.vis_con.draw_cylinder:
                     display.DrawCylinder(*draw_args)
-                if self.viewport is None or \
-                        self.viewport.lower() == args.Viewport.Name.lower():
+                if len(self.viewport)== 0 or args.Viewport.Name.lower() in self.viewport:
                     for draw_args in self.vis_con.draw_2d_text:
                         display.Draw2dText(*draw_args)
                     for draw_args in self.vis_con.draw_sprite: