Module: Magick::RVG::Stretchable

Includes:
PreserveAspectRatio
Included in:
Magick::RVG, Pattern
Defined in:
lib/rvg/stretchable.rb

Overview

The methods in this module describe the user-coordinate space. RVG and Pattern objects are stretchable.

Instance Method Summary collapse

Methods included from PreserveAspectRatio

#preserve_aspect_ratio

Instance Method Details

#viewbox(x, y, width, height) {|_self| ... } ⇒ Object

Describe a user coordinate system to be imposed on the viewbox. The arguments must be numbers and the width and height arguments must be positive.

Yields:

  • (_self)

Yield Parameters:

Raises:

  • (ArgumentError)

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# File 'lib/rvg/stretchable.rb', line 137

def viewbox(x, y, width, height)
    begin
        @vbx_x = Float(x)
        @vbx_y = Float(y)
        @vbx_width = Float(width)
        @vbx_height = Float(height)
    rescue ArgumentError
        raise ArgumentError, "arguments must be convertable to float (got #{x.class}, #{y.class}, #{width.class}, #{height.class})"
    end
    raise(ArgumentError, "viewbox width must be > 0 (#{width} given)") unless width >= 0
    raise(ArgumentError, "viewbox height must be > 0 (#{height} given)") unless height >= 0

    # return the user-coordinate space attributes if defined
    class << self
      if not defined? @redefined then
        @redefined = true
        define_method(:x) { @vbx_x }
        define_method(:y) { @vbx_y }
        define_method(:width) { @vbx_width}
        define_method(:height) { @vbx_height }
      end
    end

    yield(self) if block_given?
    self
end