# Copyright 2004, @Last Software, Inc.

# This software is provided as an example of using the Ruby interface
# to SketchUp.

# 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'

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

# This is an example of a simple animation that spins the model around

class ViewSpinner

def initialize
    # save the center of rotation
    model = Sketchup.active_model
    view = model.active_view
    camera = view.camera
    @target = model.bounds.center
    @up = Geom::Vector3d.new(0, 0, 1)
    @distance = camera.eye.distance @target
    @zmin = @target.z
    @zmax = @zmin + @distance
    @dz = @distance / 300
    @z = @zmin
    @angle = 0
    @frame = 0;
    @startTime = Time.now
    Sketchup::set_status_text("FPS", 1)
end

# The only required method for an animation is nextFrame.  It is called 
# whenever you need to show the next frame of the animation.
def nextFrame(view)
    @frame = @frame + 1
    totalTime = Time.now - @startTime
    fps = 1
    if( totalTime > 0.001 )
        fps = @frame / totalTime
    end
    fps = fps.to_i
    Sketchup::set_status_text(fps, 2)
    
    # Compute the eye point for this frame
    a = @angle * Math::PI / 180.0
    x = @target.x + (@distance * Math::sin(a))
    y = @target.y + (@distance * Math::cos(a))
    eye = Geom::Point3d.new(x, y, @z)
    view.camera.set(eye, @target, @up)
    @angle = (@angle+1)%360
    view.show_frame
    
        # make the camera move up and down
    @z += @dz
    if( @z > @zmax )
        @z = @zmax
        @dz = -@dz
    elsif( @z < @zmin )
        @z = @zmin
        @dz = -@dz
    end
    
    # If nextFrame returns false, the animation will stop
    # Uncommenting the next line will cuase th animation to
    # stop after one revolution.
    # @frame < 360
    true
end

# The stop method will be called when SketchUp wants an animation to stop
# This method is optional (you do not need to do anything in your implementation
# of the method, unless you want to. Usually it is used to clean up things, such
# as the status bar.

# The animation doesn't actually stop until the stop method has finished.

def stop
        UI.messagebox "Stopped"
end                        

end # class nextFrameTest

# This is just a function that starts spinning the active view
def nextFrameTest
        model = Sketchup.active_model
        view = model.active_view
        view.animation = ViewSpinner.new    
end

def pause
        UI.messagebox "Paused"
end

def resume
        UI.messagebox "Resumed"
end

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

# Add an Animations sub-menu to the Camera menu
if( not file_loaded?("aminationtests.rb") )

    # This will add a separator to the menu, but only once
    add_separator_to_menu("Plugins")
    
    # To add an item to a menu, you identify the menu, and then
    # provide a title to display and a block to execute.  In this case,
    # the block just calls the create_box function
    plugins_menu = UI.menu("Plugins")
    AnimationTest_menu = plugins_menu.add_submenu("Animation Tests")
    AnimationTest_menu.add_item("Animation.NextFrame") { nextFrameTest }
    AnimationTest_menu.add_item("Animation.pause") { }
    AnimationTest_menu.add_item("Animation.resume") { }
    # We cannot call the stop method of an Animation class implementation
    # explicitly, only SketchUp calls it given certain events occuring. One
    # such event is to set the current active animation to point to nothing (nil)
    AnimationTest_menu.add_item("Animation.Stop") { Sketchup.active_model.active_view.animation = nil  }

end

file_loaded("animationtests.rb")