Module: Asposeimagingjava::ConvertingSpecificPortionOfDjvuPage

Defined in:

lib/asposeimagingjava/djvu/convertingspecificportionofdjvupage.rb

Instance Method Summary

• #initialize ⇒ Object

Instance Method Details

#initialize ⇒ Object

# File 'lib/asposeimagingjava/djvu/convertingspecificportionofdjvupage.rb', line 3

def initialize()
    data_dir = File.dirname(File.dirname(File.dirname(File.dirname(__FILE__)))) + '/data/'

    # Load an existing image (of type bmp) in an instance of Image class
    image = Rjb::import('com.aspose.imaging.Image').load(data_dir + "demo.djvu")

    # Create an instance of PngOptions
    export_options = Rjb::import('com.aspose.imaging.imageoptions.PngOptions').new

    # Set ColorType to Grayscale
    export_options.setColorType(Rjb::import('com.aspose.imaging.fileformats.png.PngColorType').Grayscale)

    # Create an instance of Rectangle and specify the portion on DjVu page
    export_area = Rjb::import('com.aspose.imaging.Rectangle').new(20, 20, 500, 500)
    
    # Specify the DjVu page index
    export_page_index = 2

    # Initialize an instance of DjvuMultiPageOptions
    # while passing index of DjVu page index and instance of Rectangle covering the area to be exported
    export_options.setMultiPageOptions(Rjb::import('com.aspose.imaging.imageoptions.DjvuMultiPageOptions').new(export_page_index, export_area))
    
    # Save the result in PDF format
    image.save(data_dir + "SpecificPagePortion.png", export_options)

    # Display Status.
    puts "Converted specific page portion DjVu page to image successfully!"
end