#!/usr/bin/env ruby -w
#
#   A RMagick version of Magick++/demo/gravity.cpp
#

require 'rmagick'

x = 100
y = 100

begin

  pic = Magick::ImageList.new

  lines = Magick::Draw.new
  lines.stroke '#600'
  lines.fill_opacity 0
  lines.line 300,100, 300,500
  lines.line 100,300, 500,300
  lines.rectangle 100,100, 500,500

  draw = Magick::Draw.new
  draw.pointsize = 30
  draw.fill = '#600'
  draw.undercolor = 'red'

  0.step(330, 30) do |angle|
    puts "angle #{angle}"
    pic.new_image(600, 600) { self.background_color = 'white' }

    lines.draw pic

    draw.annotate(pic, 0,0,x,y, 'NorthWest') do
      self.gravity = Magick::NorthWestGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,0,y, 'North') do
      self.gravity = Magick::NorthGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,x,y, 'NorthEast') do
      self.gravity = Magick::NorthEastGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,x,0, 'East') do
      self.gravity = Magick::EastGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,0,0, 'Center') do
      self.gravity = Magick::CenterGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,x,y, 'SouthEast') do
      self.gravity = Magick::SouthEastGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,0,y, 'South') do
      self.gravity = Magick::SouthGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,x,y, 'SouthWest') do
      self.gravity = Magick::SouthWestGravity
      self.rotation = angle
    end
    draw.annotate(pic, 0,0,x,0, 'West') do
      self.gravity = Magick::WestGravity
      self.rotation = angle
    end
  end

  puts "Writing image \"rm_gravity_out.miff\"..."
  pic.delay = 20
  pic.write './rm_gravity_out.miff'

rescue
  puts "#{$ERROR_INFO} exception raised."
  exit 1
end

exit 0