class Magick::Image::View::Rows
Public Class Methods
new(view, width, height, rows)
click to toggle source
# File lib/rmagick_internal.rb, line 1110 def initialize(view, width, height, rows) @view = view @width = width @height = height @rows = rows end
Public Instance Methods
[](*args)
click to toggle source
# File lib/rmagick_internal.rb, line 1117 def [](*args) cols(args) # Both View::Pixels and Magick::Pixel implement Observable if @unique pixels = @view[@rows[0]*@width + @cols[0]] pixels.add_observer(self) else pixels = View::Pixels.new each do |x| p = @view[x] p.add_observer(self) pixels << p end end pixels end
[]=(*args)
click to toggle source
# File lib/rmagick_internal.rb, line 1135 def []=(*args) rv = args.delete_at(-1) # get rvalue unless rv.is_a?(Pixel) # must be a Pixel or a color name begin rv = Pixel.from_color(rv) rescue TypeError Kernel.raise TypeError, "cannot convert #{rv.class} into Pixel" end end cols(args) each { |x| @view[x] = rv.dup } changed notify_observers(self) nil end
update(pixel)
click to toggle source
A pixel has been modified. Tell the view.
# File lib/rmagick_internal.rb, line 1152 def update(pixel) changed notify_observers(self) pixel.delete_observer(self) # Don't need to hear again. nil end
Private Instance Methods
cols(*args)
click to toggle source
# File lib/rmagick_internal.rb, line 1161 def cols(*args) @cols = args[0] # remove the outermost array @unique = false # Convert @rows to an Enumerable object case @rows.length when 0 # Create a Range for all the rows @rows = Range.new(0, @height, true) when 1 # Range, Array, or a single integer # if the single element is already an Enumerable # object, get it. if @rows.first.respond_to? :each @rows = @rows.first else @rows = Integer(@rows.first) if @rows < 0 @rows += @height end if @rows < 0 || @rows > @height-1 Kernel.raise IndexError, "index [#{@rows}] out of range" end # Convert back to an array @rows = Array.new(1, @rows) @unique = true end when 2 # A pair of integers representing the starting column and the number of columns start = Integer(@rows[0]) length = Integer(@rows[1]) # Negative start -> start from last row if start < 0 start += @height end if start > @height || start < 0 || length < 0 Kernel.raise IndexError, "index [#{@rows.first}] out of range" else if start + length > @height length = @height - length length = [length, 0].max end end # Create a Range for the specified set of rows @rows = Range.new(start, start+length, true) end case @cols.length when 0 # all rows @cols = Range.new(0, @width, true) # convert to range @unique = false when 1 # Range, Array, or a single integer # if the single element is already an Enumerable # object, get it. if @cols.first.respond_to? :each @cols = @cols.first @unique = false else @cols = Integer(@cols.first) if @cols < 0 @cols += @width end if @cols < 0 || @cols > @width-1 Kernel.raise IndexError, "index [#{@cols}] out of range" end # Convert back to array @cols = Array.new(1, @cols) @unique &&= true end when 2 # A pair of integers representing the starting column and the number of columns start = Integer(@cols[0]) length = Integer(@cols[1]) # Negative start -> start from last row if start < 0 start += @width end if start > @width || start < 0 || length < 0 ; #nop else if start + length > @width length = @width - length length = [length, 0].max end end # Create a Range for the specified set of columns @cols = Range.new(start, start+length, true) @unique = false end end
each() { |j| ... }
click to toggle source
iterator called from subscript methods
# File lib/rmagick_internal.rb, line 1255 def each maxrows = @height - 1 maxcols = @width - 1 @rows.each do |j| if j > maxrows Kernel.raise IndexError, "index [#{j}] out of range" end @cols.each do |i| if i > maxcols Kernel.raise IndexError, "index [#{i}] out of range" end yield j*@width + i end end nil # useless return value end