Class: Magick::Image::View

Inherits:
Object
  • Object
show all
Defined in:
lib/rmagick_internal.rb

Overview

Magick::Image::View class

Defined Under Namespace

Classes: Pixels, Rows

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(img, x, y, width, height) ⇒ View

Returns a new instance of View.


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# File 'lib/rmagick_internal.rb', line 1048

def initialize(img, x, y, width, height)
  img.check_destroyed
  if width <= 0 || height <= 0
    Kernel.raise ArgumentError, "invalid geometry (#{width}x#{height}+#{x}+#{y})"
  end
  if x < 0 || y < 0 || (x+width) > img.columns || (y+height) > img.rows
    Kernel.raise RangeError, "geometry (#{width}x#{height}+#{x}+#{y}) exceeds image boundary"
  end
  @view = img.get_pixels(x, y, width, height)
  @img = img
  @x = x
  @y = y
  @width = width
  @height = height
  @dirty = false
end

Instance Attribute Details

#dirtyObject

Returns the value of attribute dirty


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# File 'lib/rmagick_internal.rb', line 1046

def dirty
  @dirty
end

#heightObject (readonly)

Returns the value of attribute height


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# File 'lib/rmagick_internal.rb', line 1045

def height
  @height
end

#widthObject (readonly)

Returns the value of attribute width


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# File 'lib/rmagick_internal.rb', line 1045

def width
  @width
end

#xObject (readonly)

Returns the value of attribute x


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# File 'lib/rmagick_internal.rb', line 1045

def x
  @x
end

#yObject (readonly)

Returns the value of attribute y


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# File 'lib/rmagick_internal.rb', line 1045

def y
  @y
end

Instance Method Details

#[](*args) ⇒ Object


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# File 'lib/rmagick_internal.rb', line 1065

def [](*args)
  rows = Rows.new(@view, @width, @height, args)
  rows.add_observer(self)
  rows
end

#sync(force = false) ⇒ Object

Store changed pixels back to image


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# File 'lib/rmagick_internal.rb', line 1072

def sync(force=false)
  @img.store_pixels(x, y, width, height, @view) if @dirty || force
  @dirty || force
end

#update(rows) ⇒ Object

Get update from Rows - if @dirty ever becomes true, don't change it back to false!


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# File 'lib/rmagick_internal.rb', line 1079

def update(rows)
  @dirty = true
  rows.delete_observer(self)      # No need to tell us again.
  nil
end