Class: PREP::Core::Image

Inherits:
Drawable show all
Defined in:
lib/core/image.rb

Overview

イメージ描画構成要素クラス

Constant Summary collapse

@@default_values = 
{
  :layer  => 1,
  :expand => false,
}

Instance Attribute Summary

Attributes inherited from Drawable

#identifier, #layer

Instance Method Summary collapse

Methods inherited from Drawable

#<=>, #calculate_pos, #key_string_to_symbol, #rewind_current_page, #visible?

Constructor Details

#initialize(identifier, values = { }) ⇒ Image

Returns a new instance of Image.



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# File 'lib/core/image.rb', line 21

def initialize(identifier, values = { })
  values = @@default_values.merge(key_string_to_symbol(values))
  super(identifier, values[:layer])

  @region = Region.new(values[:region][:x].mm2pixcel,
                       values[:region][:y].mm2pixcel,
                       values[:region][:width].mm2pixcel,
                       values[:region][:height].mm2pixcel)
  @image_path = values[:image_path].to_s
  @expand = values[:expand]
end

Instance Method Details

#calculate_region(prep, region, value, stop_on_drawable = nil) ⇒ Object

イメージ描画領域の計算



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# File 'lib/core/image.rb', line 34

def calculate_region(prep, region, value, stop_on_drawable = nil)
  if self == stop_on_drawable
    raise ReRenderJump.new(region)
  end

  puts "Calculate region for #{self.class}: #{self.identifier} region: #{region}" if ENV["DEBUG"]
  ret_region = Region.new(0, 0,
                          region.width - (@region.x + @region.width),
                          region.height - (@region.y + @region.height))
  return @region.x + @region.width, @region.y + @region.height
end

#draw(prep, region, value, stop_on_drawable = nil) ⇒ Object

イメージの描画



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# File 'lib/core/image.rb', line 47

def draw(prep, region, value, stop_on_drawable = nil)
  if self === stop_on_drawable
    raise ReRenderJump.new(region)
  end
  STDERR.puts("Draw on #{self.class} #{self.identifier}") if ENV['DEBUG']
  # 領域判定
  calculate_region(prep, region, value)
  
  # イメージファイルの指定があるか確認
  if value.to_s != ""
    # Load png image from specific file path
    image_path = value.to_s
  else
    # Load png image from default path
    image_path = @image_path.dup
  end
  begin
    image_data = prep.pdf.load_png_image_from_file(image_path)
  rescue => e
    raise "Failed to load the PNG image from '#{image_path}'"
  end
  region_backup = @region.dup
  if @expand_region
    @region = @expand_region.dup
    @expand_region = nil
  end
  pos_x, pos_y = calculate_pos(prep.current_page, region, @region.x, @region.y)
  # draw png image
  prep.current_page.draw_image(image_data,
                               pos_x, pos_y - @region.height,
                               @region.width, @region.height)
  @region = region_backup
  prep.current_page.drawed = true
end