# Copyright 2004, @Last Software, Inc., modified by Matt Gorbet, using tons of code by RickW

# Permission to use, copy, modify, and distribute this software for 
# any purpose and without fee is hereby granted, provided that 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.
#-----------------------------------------------------------------------------

require 'sketchup.rb'
require 'linetool.rb'

#-----------------------------------------------------------------------------


# This tool inherits from linetool.rb and implements RickW's flightpath algorithm.
# Use it by first selecting your curve, then right-click (context menu) and choose 
# FlightPath Tool.  Then select a start point for your target, then an end point.  
# The flightpath will be created as a set of pages that you can view as a slideshow.

## YOU MUST HAVE linetool.rb (from the examples) in your plugins folder for this to work.

#A few other changes -- I hardcoded a FOV of 60 degrees into the cameras - I find that's 
# generally a nice wide FOV for flying through architecture.  You can change it in below
# if you like.  Also the new pages do not remember the rendering settings ('display' 
# checkbox) or the hidden settings -- this way you can watch or export your flythrough with 
# various styles, modes, and geometry hidden or showing.

# I also removed RickW's "reverse path" option -- it wasn't useful to me -- you can 
# uncomment a few lines and put it back, although I think my code for the forward 
# path is now different from the reverse path so it might take some tweaking.

# enjoy!



class FlightPathTool < LineTool

# Override the create_geometry method to use 
# the points to define the target start and end).  

def create_geometry(pt1, pt2, view)
    model = view.model
    model.start_operation "Set Flightpath Targets"
    
	ents=model.active_entities
	view=model.active_view
	sel=model.selection
	pages=model.pages
	layers=model.layers
	lyr=layers.add("FlightPath_Layer")
	lyr.page_behavior=LAYER_IS_HIDDEN_ON_NEW_PAGES

   	up=[0,0,1]
	edge=sel[sel.length-1]
	path=edge.curve
	edges=path.edges
	cameras=[]
	transTimes=[0]
	newPages=[]

	flyThroughRate=10 if not defined? flyThroughRate
	
	prompts=["Enter distance per second (with units): \n "]
	
	values=[flyThroughRate]
	results=inputbox(prompts,values,"Flythrough Rate")
	flyThroughRate=results[0].to_l

        


        targstart = pt1
        targend   = pt2

     

	sel.clear
	sel.add(edges[0])
	edge.layer=lyr
 
        

  #    UI.messagebox("rate is #{flyThroughRate.to_s} per second");

        numpages = edges.length-1
        targdx = (targend.x-targstart.x)/numpages
        targdy = (targend.y-targstart.y)/numpages
        targdz = (targend.z-targstart.z)/numpages

### I commented out Rick's original "reverse path" stuff because I found I never needed to and it was in my way...

	if UI.messagebox("Reverse Path?", MB_YESNO, "Flight Path")==7
	sel.clear
		0.upto(numpages) do |e|
			eye=edges[e].start.position
			target=[(targstart.x+(targdx*e)),(targstart.y+(targdy*e)),(targstart.z+(targdz*e))]

##  I SET MY CAMERA FOV to SIXTY DEGREES w/ perspective HERE:
			newCamera=Sketchup::Camera.new(eye,target,up, true, 60.0) 
			view.camera=newCamera
			p=pages.add

## I turn off memory of display options and hidden stuff in the pages
			p.use_rendering_options=false
                        p.use_hidden=false
                        p.transition_time=edges[e].length/flyThroughRate

#                        UI.messagebox("transtime #{e} will be #{p.transition_time} seconds")

			edges[e].layer=lyr
		end

	else
		sel.clear
		edges.reverse!
#		UI.messagebox("ok doing the reverse...")
		0.upto(numpages) do |e|
			eye=edges[e].start.position
			target=[(targstart.x+(targdx*e)),(targstart.y+(targdy*e)),(targstart.z+(targdz*e))]

##  I SET MY CAMERA FOV to SIXTY DEGREES w/ perspective HERE:
			newCamera=Sketchup::Camera.new(eye,target,up, true, 60.0) 
			view.camera=newCamera
			p=pages.add

## I turn off memory of display options and hidden stuff in the pages
			p.use_rendering_options=false
                        p.use_hidden=false
                        p.transition_time=edges[e].length/flyThroughRate

#                        UI.messagebox("transtime #{e} will be #{p.transition_time} seconds")

			edges[e].layer=lyr
		end

	end

    model.commit_operation
    Sketchup.send_action("selectSelectionTool:")

end

end # class FlightPathTool

#-----------------------------------------------------------------------------
# This functions is just a shortcut for selecting the new tool
def flightpathtool
    Sketchup.active_model.select_tool FlightPathTool.new
end

def preparefortakeoff
	return true if Sketchup::active_model.selection.first.class==Sketchup::Edge
	return nil
end

if( not file_loaded?("flightpathtool.rb") )
	UI.add_context_menu_handler do |menu|
		menu.add_separator
		menu.add_item("Flight Path Tool") { flightpathtool } if preparefortakeoff
	end
end

file_loaded("flightpathtool.rb")