Class: Polygonfy::Polygon

Inherits:
Struct
  • Object
show all
Defined in:
lib/polygonfy/Polygon.rb

Constant Summary collapse

MARGIN = 
12
STYLES = 
{
  polygon: "fill:#4f9bff; stroke:#216cce; stroke-width:1; opacity:0.5",
  circle: "fill:orange"
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#points ⇒ Object

Returns the value of attribute points

Returns:

  • (Object) —

    the current value of points



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# File 'lib/polygonfy/Polygon.rb', line 4

def points
  @points
end

Instance Method Details

#height ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 15

def height
  points.map(&:y).max + (2 * MARGIN)
end

#point_title(i) ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 23

def point_title(i)
  prev_point = points[i - 1].id
  next_point = points[(i + 1) % points.size].id
  curr_point = "(#{points[i].x}, #{points[i].y})"

  "#{prev_point} #{curr_point} #{next_point}"
end

#point_x(point) ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 31

def point_x(point)
  point.x + MARGIN
end

#point_y(point) ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 35

def point_y(point)
  height - (point.y + MARGIN)
end

#polygon_area ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 19

def polygon_area
  points.map { |p| "#{p.x + MARGIN},#{height - (p.y + MARGIN)}" }.join(' ')
end

#to_xml ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 39

def to_xml
  builder = Nokogiri::XML::Builder.new do |xml|
    xml.svg(xmlns: "http://www.w3.org/2000/svg", width: width, height: height) {
      xml.polygon(style: STYLES[:polygon], points: polygon_area)
      xml.g {
        points.each_with_index do |p, i|
          xml.circle(style: STYLES[:circle], cx: point_x(p), cy: point_y(p), r: "12")
          xml.text_(x: point_x(p), y: point_y(p) + 5, 'text-anchor': 'middle') {
            xml.text(p.id)
            xml.title {
              xml.text(point_title(i))
            }
          }
        end
      }
    }
  end

  builder.to_xml
end

#width ⇒ Object 



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# File 'lib/polygonfy/Polygon.rb', line 11

def width
  points.map(&:x).max + (2 * MARGIN)
end