Class: Triangular::Line

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line_start, line_end) ⇒ Line

Returns a new instance of Line.



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# File 'lib/triangular/line.rb', line 6

def initialize(line_start, line_end)
  @start = line_start
  @end = line_end
end

Instance Attribute Details

#end ⇒ Object

Returns the value of attribute end.



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# File 'lib/triangular/line.rb', line 4

def end
  @end
end

#start ⇒ Object

Returns the value of attribute start.



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# File 'lib/triangular/line.rb', line 4

def start
  @start
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/triangular/line.rb', line 11

def ==(other)
  return false unless other.is_a?(Line)
  self.start == other.start && self.end == other.end
end

#intersection_at_z(z_plane) ⇒ Object 



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# File 'lib/triangular/line.rb', line 24

def intersection_at_z(z_plane)
  return nil if !self.intersects_z?(z_plane)
  raise "Cannot calculate intersection for line that lies on the target Z plane" if @start.z == z_plane && @end.z == z_plane
  
  x_intersect = (@end.x - @start.x) / (@end.z - @start.z) * (z_plane - @start.z) + @start.x
  y_intersect = (@end.y - @start.y) / (@end.z - @start.z) * (z_plane - @start.z) + @start.y
  
  Point.new(x_intersect, y_intersect, z_plane)
end

#intersects_z?(z_plane) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/triangular/line.rb', line 16

def intersects_z?(z_plane)
  if (@start.z >= z_plane && @end.z <= z_plane) || (@start.z <= z_plane && @end.z >= z_plane)
    true
  else
    false
  end
end

#to_svg_path(units) ⇒ Object 



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# File 'lib/triangular/line.rb', line 34

def to_svg_path(units)
  "<path d=\"M #{@start.x} #{@start.y} L #{@end.x} #{@end.y}\" fill=\"none\" stroke=\"black\" stroke-width=\"#{Units.stroke_width(units)}\" />"
end