# Copyright 2006, TIG
# Permission to use, copy, modify, and distribute this software for 
# any purpose and without fee is hereby granted, provided the above
# copyright notice appear in all copies.
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#-----------------------------------------------------------------------
# Name        : Elev45shadows.rb
# Description : Adds 45 degree top-left shadows to elevations etc.
# Menu Item   : View -> Elevation 45 Shadows
# Context Menu: Not available
# Author      : TIG
# Usage       : Set up your elevation-view page(s).  Tip - Select an 
#				elevation face and right-click and pick Align View to 
#				get a non-orthogonal [non-F/B/L/R] elevation.  
#				Then select this tool from the menu and it will 
#				automatically work out camera view direction and add 
#				shadows as if the sun is from the top-left of the view 
#				at 45 degrees in elevation or in plan...
#				Note aligning views to 3D sloping faces will have 
#				unexpected affects.
#				It will realign North in each altered view so IF North 
#				is important in other shadow studies ensure that pages 
#				are kept separate.
#				Shadow setting changes are NOT Undo-able...
#				To toggle shadows to 'top-right' for that session open 
#				the Ruby Console, and type or copy-paste the following   
#				and press enter   = $e45s=0
#				to turn back it's = $e45s=1 or just restart SketchUp.
#
# Date        : 18/02/2006
# Type        : Tool
# Version     :	1.0	18/02/06	First issue.
#			1.1 	19/02/06	Ruby console puts removed.
#			1.2 	20/02/06	Time zone now auto-changes to GMT and 
#						city/country = "...45...". 
#						$e45s=1 / 0 = left / right toggle added..
#			1.3	09/10/08	Minor adjustments to get near 45 as possible.
#-----------------------------------------------------------------------
require 'sketchup.rb'
###
def elev45shadows
###
model= Sketchup.active_model
shadowinfo= model.shadow_info
view= model.active_view
direction= view.camera.direction
$e45s= 1 if not $e45s ###at startup
x= direction.x
y= direction.y
z= direction.z
a= Math.atan2(y,x)
a= a.abs*57.295779513082320900 ### into abs degrees
if y == 0
   if x > 0 ###looking east (axis)
      angle= 90+45
   end
   if x < 0 ###looking west
      angle= 270+45
   end
end
if y > 0
   angle= 0+45 if x == 0 ###looking north
   if x > 0 ### ne quadrant
      angle= 90-a+45###
   end
   if x < 0 ### nw quadrant
      angle= 180-a-90+45###
   end
end
if y < 0
   angle= 180+45 if x == 0 ###looking south
   if x > 0.0 ### se quadrants
     angle= a+180-45###
   end
   if x < 0 ### sw quadrant
      angle= a+90+45###
   end
end
angle=angle-90 if $e45s == 0 ###
angle= 90+45 if z != 0 and (x==0 and y==0) ###plan
###
shadowinfo["Country"]= "Elevation 45 shadows" ###
shadowinfo["City"]= "Elevation 45 shadows" ###
shadowinfo["TZoffset"]= 0 ###
shadowinfo["DisplayShadows"]= true
shadowinfo["Latitude"]= 55.1800 ### why ??? but it works !!!
shadowinfo["Longitude"]= 0.1000 ### why ??? but it works !!!
shadowinfo["NorthAngle"]= angle
shadowinfo["ShadowTime"]= Time.gm(2000,"mar",21,12,06,50) ### why ??? but it works !!!
###
end#def
###########################
#--------- menu -----------------------------
if( not file_loaded?("Elev45shadows.rb") )
   UI.menu("View").add_separator
   UI.menu("View").add_item("Elevation 45 Shadows") {elev45shadows}
end#if
file_loaded("Elev45shadows.rb")
#---------------------------------