Class: Morandi::ImageCaption

Inherits:
ImageOp
  • Object
show all
Defined in:
lib/morandi/image-ops.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from ImageOp

new_from_hash, #priority

Constructor Details

#initialize ⇒ ImageCaption

Returns a new instance of ImageCaption.



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# File 'lib/morandi/image-ops.rb', line 110

def initialize()
  super()
end

Instance Attribute Details

#font ⇒ Object

Returns the value of attribute font.



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# File 'lib/morandi/image-ops.rb', line 109

def font
  @font
end

#position ⇒ Object

Returns the value of attribute position.



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# File 'lib/morandi/image-ops.rb', line 109

def position
  @position
end

#text ⇒ Object

Returns the value of attribute text.



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# File 'lib/morandi/image-ops.rb', line 109

def text
  @text
end

Instance Method Details

#call(image, pixbuf) ⇒ Object 



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# File 'lib/morandi/image-ops.rb', line 123

def call(image, pixbuf)
  @pixbuf = pixbuf
  surface = Cairo::ImageSurface.new(:rgb24, pixbuf.width, pixbuf.height)
  cr = Cairo::Context.new(surface)

  cr.save do
    cr.set_source_pixbuf(pixbuf)
    #cr.rectangle(0, 0, pixbuf.width, pixbuf.height)
    cr.paint(1.0)
    cr.translate(*self.position)

    layout = cr.create_pango_layout
    layout.set_text(self.text)
    fd = Pango::FontDescription.new(self.font)
    layout.font_description = fd
    layout.set_width((pixbuf.width - self.position[0] - 100)*Pango::SCALE)
    layout.context_changed
    ink, _ = layout.pixel_extents
    cr.set_source_rgba(0, 0, 0, 0.3)
    cr.rectangle(-25, -25, ink.width + 50, ink.height + 50)
    cr.fill
    cr.set_source_rgb(1, 1, 1)
    cr.show_pango_layout(layout)
  end


  final_pb = surface.to_pixbuf
  cr.destroy
  surface.destroy
  return final_pb
end