Module: Contrek::Bitmaps::Painting

Included in:
Bitmap
Defined in:
lib/contrek/bitmaps/painting.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.direct_draw_polygons(polygons, png_image, zoom: 1) ⇒ Object 



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# File 'lib/contrek/bitmaps/painting.rb', line 24

def self.direct_draw_polygons(polygons, png_image, zoom: 1)
  polygons.compact.each do |poly|
    if (bounds = poly[:bounds])
      b_factor = 3.to_f / zoom
      bounds_polygon = [
        {x: bounds[:min_x] - b_factor, y: bounds[:min_y] - b_factor},
        {x: bounds[:max_x] + b_factor, y: bounds[:min_y] - b_factor},
        {x: (bounds[:max_x] + b_factor), y: bounds[:max_y] + b_factor},
        {x: (bounds[:min_x] - b_factor), y: bounds[:max_y] + b_factor}
      ]
      draw_polygon(bounds_polygon, png_image, ChunkyPNG::Color("blue @ 1.0"), zoom)
    end
    color = ChunkyPNG::Color("red @ 1.0")
    draw_polygon(poly[:outer], png_image, color, zoom)
    color = ChunkyPNG::Color("green @ 1.0")
    poly[:inner].each do |sequence|
      draw_polygon(sequence, png_image, color, zoom)
    end
  end
end

.draw_polygon(sequence, png_image, color, zoom, margin = 0) ⇒ Object 



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# File 'lib/contrek/bitmaps/painting.rb', line 45

def self.draw_polygon(sequence, png_image, color, zoom, margin = 0)
  return if sequence.empty?
  sequence.each_cons(2) do |coords|
    png_image.draw_line(coords[0][:x] * zoom,
      coords[0][:y] * zoom,
      coords[1][:x] * zoom,
      coords[1][:y] * zoom, color)
  end
  png_image.draw_line(sequence[0][:x] * zoom,
    sequence[0][:y] * zoom,
    sequence[-1][:x] * zoom,
    sequence[-1][:y] * zoom, color)
end

Instance Method Details

#bitmap_colors(step: 1, max: 0) ⇒ Object 



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# File 'lib/contrek/bitmaps/painting.rb', line 10

def bitmap_colors(step: 1, max: 0)
  colors = {}
  step = 1 if step <= 0
  0.step(h - 1, step) do |h|
    0.step(w - 1, step) do |w|
      color = value_at(w, h)
      colors[color] ||= 0
      colors[color] += 1
      break if colors.size == max
    end
  end
  colors.sort_by { |color, count| -color }
end

#draw_line(start_x, start_y, end_x, end_y, value) ⇒ Object

Raises:

  • (NoMethodError) 


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# File 'lib/contrek/bitmaps/painting.rb', line 6

def draw_line(start_x, start_y, end_x, end_y, value)
  raise NoMethodError
end