Class: CTioga2::Graphics::Types::Rect

Inherits:
Object
  • Object
show all
Defined in:
lib/ctioga2/graphics/types/point.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tl, br) ⇒ Rect

Returns a new instance of Rect.



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# File 'lib/ctioga2/graphics/types/point.rb', line 121

def initialize(tl, br)
  @tl = tl
  @br = br
end

Instance Attribute Details

#br ⇒ Object

Returns the value of attribute br.



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# File 'lib/ctioga2/graphics/types/point.rb', line 119

def br
  @br
end

#tl ⇒ Object

Returns the value of attribute tl.



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# File 'lib/ctioga2/graphics/types/point.rb', line 118

def tl
  @tl
end

Instance Method Details

#dimensions(t) ⇒ Object

Returns the [height, width] of the rectangle in postscript points



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# File 'lib/ctioga2/graphics/types/point.rb', line 127

def dimensions(t)
  xl, yt = @tl.to_figure_xy(t)
  xr, yb = @br.to_figure_xy(t)

  return [t.convert_figure_to_output_dx(xr - xl) * t.scaling_factor,
          t.convert_figure_to_output_dy(yb - yt) * t.scaling_factor]
end

#make_corners(t, swap = false, ratio_pol = :ignore, ratio = nil) ⇒ Object

Returns an array of [ul, ll, lr] coordinates. If an aspect ratio is specified, the coordinates will be expanded or contracted to fit the aspect ratio (keeping the center identical).



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# File 'lib/ctioga2/graphics/types/point.rb', line 139

def make_corners(t, swap = false, ratio_pol = :ignore, 
                 ratio = nil)
  
  ul = @tl.to_figure_xy(t)
  lr = @br.to_figure_xy(t)

  width, height = *dimensions(t)

  # First, swap the coords
  if swap
    if width < 0
      ul[0], lr[0] = lr[0], ul[0]
    end
    if height > 0
      ul[1], lr[1] = lr[1], ul[1]
    end
  end

  # Now, we take the aspect ratio into account
  if ratio && ratio_pol != :ignore

    xc = 0.5 * (ul[0] + lr[0])
    yc = 0.5 * (ul[1] + lr[1])
    dx = lr[0] - ul[0]
    dy = lr[1] - ul[1]

    fact = ((width/height) / ratio).abs

    what = nil

    if ratio_pol == :expand
      if fact > 1       # must increase height
        what = :y
      else
        fact = 1/fact
        what = :x
      end
    elsif ratio_pol == :contract
      if fact > 1       # must decrease width
        what = :x
        fact = 1/fact
      else
        what = :y
      end
    else
      raise "Unkown aspect ratio policy: #{ratio_pol}"
    end

    if what == :y
      lr[1] = yc + fact * 0.5 * dy
      ul[1] = yc - fact * 0.5 * dy
    else
      lr[0] = xc + fact * 0.5 * dx
      ul[0] = xc - fact * 0.5 * dx
    end
  end

  ll = [ul[0], lr[1]]

  return [ul, ll, lr]
end