Class: Theseus::Formatters::PNG::Sigma

Inherits:
Theseus::Formatters::PNG show all
Defined in:
lib/theseus/formatters/png/sigma.rb

Overview

Renders a SigmaMaze to a PNG canvas. Does not currently support the :wall_width option.

You will almost never access this class directly. Instead, use SigmaMaze#to(:png, options) to return the raw PNG data directly.

Constant Summary

Constants inherited from Theseus::Formatters::PNG

ANY_E, ANY_N, ANY_S, ANY_W, DEFAULTS

Instance Attribute Summary

Attributes inherited from Theseus::Formatters::PNG

#options

Instance Method Summary collapse

Methods inherited from Theseus::Formatters::PNG

#clamp, #color_at, #fill_poly, #fill_rect, #line, #move, #to_blob

Constructor Details

#initialize(maze, options = {}) ⇒ Sigma

Create and return a fully initialized PNG::Sigma object, with the maze rendered. To get the maze data, call #to_blob.

See Theseus::Formatters::PNG for a list of all supported options.



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# File 'lib/theseus/formatters/png/sigma.rb', line 16

def initialize(maze, options={})
  super

  width = @options[:outer_padding] * 2 + (3 * maze.width + 1) * @options[:cell_size] / 4
  height = @options[:outer_padding] * 2 + maze.height * @options[:cell_size] + @options[:cell_size] / 2

  canvas = ChunkyPNG::Image.new(width, height, @options[:background])

  maze.height.times do |y|
    py = @options[:outer_padding] + y * @options[:cell_size]
    maze.row_length(y).times do |x|
      px = @options[:outer_padding] + x * 3 * @options[:cell_size] / 4.0
      shifted = (x % 2 != 0)
      dy = shifted ? (@options[:cell_size] / 2.0) : 0
      draw_cell(canvas, [x, y], shifted, px, py+dy, maze[x, y])
    end
  end

  @blob = canvas.to_blob
end