Class: CTioga2::Graphics::Types::AlignedPoint

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

Overview

A Point, but with alignment facilities.

Constant Summary collapse

AlignmentSpecification = 
{
  'r' => :right,
  'c' => :center,
  'l' => :left,
  't' => :top,
  'b' => :bottom
}

Instance Attribute Summary collapse

Attributes inherited from Point

#x, #y

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Point

#to_figure_xy, #to_frame_xy

Constructor Details

#initialize(x = nil, y = nil, type = :figure, halign = :center, valign = :center) ⇒ AlignedPoint

Creates a AlignedPoint



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

def initialize(x = nil, y = nil, type = :figure, 
               halign = :center, valign = :center)
  super(x,y,type)
  @halign = halign
  @valign = valign
end

Instance Attribute Details

#halign ⇒ Object

Horizontal alignment (:left, :center, :right)



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# File 'lib/ctioga2/graphics/types/point.rb', line 124

def halign
  @halign
end

#valign ⇒ Object

Vertical alignement (:top, :center, :bottom)



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

def valign
  @valign
end

Class Method Details

.from_text(text, default = :figure) ⇒ Object

Creates an AlignedPoint object from a text specification. Splits up the text at a comma and



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# File 'lib/ctioga2/graphics/types/point.rb', line 191

def self.from_text(text, default = :figure)
  if not text =~ /^\s*([btlrc]{2})(?::([^,]+),\s*(.*))?\s*$/
    raise "Invalid format for aligned point: #{text}"
  end

  specs = $1
  specs = specs.chars.map {|x| 
    AlignmentSpecification.fetch(x.downcase)
  }
  coord = AlignedPoint.new
  if specs[0] == :center
    specs.reverse!
  end
  case specs[0]
  when :center
    coord.halign = :center
    coord.valign = :center
  when :left, :right
    coord.halign = specs[0]
    coord.valign = specs[1]
  when :top, :bottom
    coord.valign = specs[0]
    coord.halign = specs[1]
  end

  if $2
    x_spec,y_spec = $2,$3
    coord.x = BaseCoordinate.from_text(x_spec, :x, default)
    coord.y = BaseCoordinate.from_text(y_spec, :y, default)
  else
    case coord.halign
    when :center
      coord.x = BaseCoordinate.new(:frame, 0.5, :x)
    when :left
      coord.x = BaseCoordinate.new(:frame, 0.05, :x)
    when :right
      coord.x = BaseCoordinate.new(:frame, 0.95, :x)
    end

    case coord.valign
    when :center
      coord.y = BaseCoordinate.new(:frame, 0.5, :y)
    when :bottom
      coord.y = BaseCoordinate.new(:frame, 0.05, :y)
    when :top
      coord.y = BaseCoordinate.new(:frame, 0.95, :y)
    end
  end
  return coord
end

Instance Method Details

#to_frame_coordinates(t, width, height) ⇒ Object

Returns frame coordinates corresponding to the point, the alignment and the given size in figure coordinates



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# File 'lib/ctioga2/graphics/types/point.rb', line 136

def to_frame_coordinates(t, width, height)
  dx = t.convert_figure_to_frame_dx(width).abs
  dy = t.convert_figure_to_frame_dy(height).abs
  x,y = self.to_frame_xy(t)

  case @valign
  when :top
    yt = y
    yb = y - dy
  when :bottom
    yt = y + dy
    yb = y
  when :center
    yt = y + dy/2
    yb = y - dy/2
  else 
    raise "Unknown vertical alignment: #{@valign}"
  end

  case @halign
  when :right
    xl = x - dx
    xr = x
  when :left
    xl = x
    xr = x + dx
  when :center
    xl = x - dx/2
    xr = x + dx/2
  else 
    raise "Unknown horizontal alignment: #{@halign}"
  end
  return [xl, yt, xr, yb]
end

#to_frame_margins(t, width, height) ⇒ Object

Returns a frame_margin corresponding to the point, the alignment and the given size in figure coordinates.

See #to_frame_coordinates



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# File 'lib/ctioga2/graphics/types/point.rb', line 175

def to_frame_margins(t, width, height)
  xl, yt, xr, yb = to_frame_coordinates(t, width, height)
  return [xl,1 - xr, 1 - yt, yb]
end