Class: GD::GIS::Style

Inherits:
Object
  • Object
show all
Defined in:
lib/gd/gis/style.rb

Overview

Defines visual styling rules for map rendering.

A Style object encapsulates all visual configuration used during rendering, including colors, stroke widths, fonts, and layer ordering.

Styles are typically loaded from YAML files and applied to a Map instance before rendering.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(definition) ⇒ Style

Creates a new style from a definition hash.

Parameters:

  • definition (Hash) —

    style definition with optional sections: :global, :roads, :rails, :water, :parks, :points, :order, :track



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# File 'lib/gd/gis/style.rb', line 49

def initialize(definition)
  @global = definition[:global] || {}
  @point = definition[:point] || {}
  @roads = definition[:roads] || {}
  @rails = definition[:rails] || {}
  @water = definition[:water] || {}
  @parks = definition[:parks] || {}
  @points = definition[:points] || {}
  @track = definition[:track] || {}
  @order = definition[:order] || []
end

Instance Attribute Details

#global ⇒ Hash (readonly)

Returns global styling rules.

Returns:

  • (Hash) —

    global styling rules



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# File 'lib/gd/gis/style.rb', line 18

def global
  @global
end

#order ⇒ Array<Symbol> (readonly)

Returns drawing order of semantic layers.

Returns:

  • (Array<Symbol>) —

    drawing order of semantic layers



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# File 'lib/gd/gis/style.rb', line 42

def order
  @order
end

#parks ⇒ Hash (readonly)

Returns park styling rules.

Returns:

  • (Hash) —

    park styling rules



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# File 'lib/gd/gis/style.rb', line 33

def parks
  @parks
end

#point ⇒ Hash (readonly)

Returns point styling rules.

Returns:

  • (Hash) —

    point styling rules



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# File 'lib/gd/gis/style.rb', line 21

def point
  @point
end

#points ⇒ Hash (readonly)

Returns point styling rules.

Returns:

  • (Hash) —

    point styling rules



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# File 'lib/gd/gis/style.rb', line 36

def points
  @points
end

#rails ⇒ Hash (readonly)

Returns rail styling rules.

Returns:

  • (Hash) —

    rail styling rules



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# File 'lib/gd/gis/style.rb', line 27

def rails
  @rails
end

#roads ⇒ Hash (readonly)

Returns road styling rules.

Returns:

  • (Hash) —

    road styling rules



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# File 'lib/gd/gis/style.rb', line 24

def roads
  @roads
end

#track ⇒ Hash (readonly)

Returns track styling rules.

Returns:

  • (Hash) —

    track styling rules



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# File 'lib/gd/gis/style.rb', line 39

def track
  @track
end

#water ⇒ Hash (readonly)

Returns water styling rules.

Returns:

  • (Hash) —

    water styling rules



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# File 'lib/gd/gis/style.rb', line 30

def water
  @water
end

Class Method Details

.deep_symbolize(obj) ⇒ Object

Recursively converts hash keys to symbols.

Parameters:

  • obj (Object)

Returns:

  • (Object) 


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# File 'lib/gd/gis/style.rb', line 101

def self.deep_symbolize(obj)
  case obj
  when Hash
    obj.transform_keys(&:to_sym)
       .transform_values { |v| deep_symbolize(v) }
  when Array
    obj.map { |v| deep_symbolize(v) }
  else
    obj
  end
end

.default ⇒ Style

Returns a built-in default style so Map can render even if no external style is set.

Returns:



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# File 'lib/gd/gis/style.rb', line 116

def self.default
  new({
        global: {
          background: [15, 23, 42],
          font: GD::GIS::FontHelper.find("DejaVuSans"),
          font_color: [243, 244, 246],
          label: {
            color: [229, 231, 235],
            font: GD::GIS::FontHelper.find("DejaVuSans"),
            size: 12
          }
        },

    label: {
      label: {
        color: [229, 231, 235],
        font: GD::GIS::FontHelper.find("DejaVuSans"),
        size: 12
      }
    },

    roads: {
      roads: {
        color: [229, 231, 235],
        font: GD::GIS::FontHelper.find("DejaVuSans"),
        width: 6
      }
    },

    rails: {
      rails: {
        color: [156, 163, 175],
        font: GD::GIS::FontHelper.find("DejaVuSans"),
        width: 5
      }
    },

    water: {
      water: {
        color: [59, 130, 246]
      }
    },

    parks: {
      parks: {
        color: [34, 197, 94]
      }
    },

    points: {
      points: {
        color: [239, 68, 68],
        radius: 4,
        font: GD::GIS::FontHelper.find("DejaVuSans"),
        font_color: [243, 244, 246]
      }
    },

    track: {
      track: {
        stroke: [0, 85, 127, 250],
        color: [250, 204, 21],
        width: 2,
        font_color: [243, 244, 246]
      }
    },

    order: %i[water parks rails roads points track]
      })
end

.load(name, from: "styles") ⇒ Style

Loads a style definition from a YAML file.

The file name is resolved as:

<from>/<name>.yml

All keys are deep-symbolized on load.

Parameters:

  • name (String, Symbol) —

    style name (without extension)

  • from (String) (defaults to: "styles") —

    directory containing style files

Returns:

Raises:

  • (RuntimeError) —

    if the style file does not exist

  • (Psych::SyntaxError) —

    if the YAML is invalid



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# File 'lib/gd/gis/style.rb', line 77

def self.load(name, from: "styles")
  path = File.join(from, "#{name}.yml")
  raise "Style not found: #{path}" unless File.exist?(path)

  data = YAML.load_file(path)
  data = deep_symbolize(data)

  new(
    global: data[:global],
    point: data[:point],
    roads: data[:roads],
    rails: data[:rail] || data[:rails],
    track: data[:track],
    water: data[:water],
    parks: data[:park] || data[:parks],
    points: data[:points],
    order: (data[:order] || []).map(&:to_sym)
  )
end

Instance Method Details

#normalize_color(color) ⇒ GD::Color

Normalizes a color definition into a GD::Color.

Accepted formats:

  • GD::Color instance

  • r, g, b
  • r, g, b, a

  • nil (generates a random vivid color)

Parameters:

  • color (GD::Color, Array<Integer>, nil)

Returns:

  • (GD::Color)

Raises:

  • (ArgumentError) —

    if the format is invalid



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# File 'lib/gd/gis/style.rb', line 198

def normalize_color(color)
  case color
  when GD::Color
    color

  when Array
    case color.length
    when 3
      GD::Color.rgb(*color)
    when 4
      GD::Color.rgba(*color)
    else
      raise ArgumentError,
            "Style error: color array must be [r,g,b] or [r,g,b,a]"
    end

  when nil
    GD::GIS::ColorHelpers.random_vivid

  else
    raise ArgumentError,
          "Style error: invalid color format (#{color.inspect})"
  end
end