jf_attach_camera_to_sun.rb

# jf_attach_camera_to_sun.rb (C) jim.foltz@gmail.com
#

# Name: Sun Tool
#
module JF

  module AttachCameraToSun

    VERSION = '1.0.0'.freeze

    class ShadowInfoObserver < Sketchup::ShadowInfoObserver

      def register(tool)
        @tool = tool
      end

      def onShadowInfoChanged(*args)
        si = args[0]
        if @tool
          @tool.update()
        else
          raise "#{$0}Tool not registered."
        end
      end

    end # class ShadowInfoObserver

    class CameraToSunTool

      def activate
        @camera          = Sketchup.active_model.active_view.camera
        @mem             = [@camera.eye, @camera.target, @camera.up]
        @target          = Sketchup.active_model.bounds.center
        @shadow_observer = ShadowInfoObserver.new
        @altitude        = (@camera.eye - @target).length
        @shadow_observer.register(self)
        Sketchup.active_model.shadow_info.add_observer(@shadow_observer)

        sel = Sketchup.active_model.selection
        if sel.size > 0
          bb = Geom::BoundingBox.new
          sel.each do |entity|
            if entity.respond_to?(:bounds)
              bb.add(entity.bounds)
            end
          end
          @target = bb.center
        end

        update
      end

      def enableVCB?
        return true
      end

      def onUserText(text, view)
        @altitude = text.to_l
        update
      end

      # called when the ShadowInfo is changed
      def update()
        si = Sketchup.active_model.shadow_info
        v = si["SunDirection"]
        v.length = @altitude
        t = si["ShadowTime"]
        tz = si["TZOffset"]
        t = t - (60 * 60 * tz)
        ft = t.strftime("%m/%d/%Y %H:%M %p")
        Sketchup.set_status_text("Attach Camera To Sun v#{VERSION} - Shadow Time: #{ft}", SB_PROMPT)
        Sketchup.set_status_text("Distance", SB_VCB_LABEL)
        Sketchup.set_status_text(v.length, SB_VCB_VALUE)
        @pt = @target + v
        Sketchup.active_model.active_view.invalidate
      end


      def deactivate(*args)
        Sketchup.active_model.shadow_info.remove_observer(@shadow_observer)
        @shadow_observer = nil
        @camera.set(*@mem)
      end

      def resume(view)
        @altitude = (@camera.eye - @target).length
        Sketchup.set_status_text "Sun Tool", SB_PROMPT
        update
      end


      def draw(view)
        if @pt
          @camera.set(@pt, @target, Z_AXIS)
        end
      end

    end # SunTool

  end # AttachCameraToSun

end # jf

UI.menu('Plugins').add_item("Attach Camera to Sun") { Sketchup.active_model.select_tool(JF::AttachCameraToSun::CameraToSunTool.new) }