Class: DXRuby::Tiled::StaggeredLayer

Inherits:
Layer
  • Object
show all
Defined in:
lib/dxruby_tiled/layer_staggered.rb

Instance Attribute Summary

Attributes inherited from Layer

#data, #height, #name, #offset_x, #offset_y, #opacity, #properties, #visible, #width

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Layer

#[], #[]=, #include?, #initialize

Constructor Details

This class inherits a constructor from DXRuby::Tiled::Layer

Class Method Details

.pixel_height(map) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 113

def self.pixel_height(map)
  return map.stagger_axis_y ?
          map.tile_height * (map.height + 1) / 2 :
          map.tile_height * map.height + map.tile_height / 2
end

.pixel_width(map) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 107

def self.pixel_width(map)
  return map.stagger_axis_y ?
          map.tile_width * map.width + map.tile_width / 2 :
          map.tile_width * (map.width + 1) / 2
end

Instance Method Details

#at(x, y) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 75

def at(x, y)
  tmp_x, tmp_y = xy_at(x, y)
  return self[tmp_x, tmp_y]
end

#change_at(x, y, value) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 80

def change_at(x, y, value)
  tmp_x, tmp_y = xy_at(x, y)
  self[tmp_x, tmp_y] = value
end

#draw(x, y, target = DXRuby::Window) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 5

def draw(x, y, target = DXRuby::Window)
  tile_width2, tile_height2 = @map.tile_width / 2, @map.tile_height / 2
  tile_images = @map.tilesets.tile_images
  left, top = xy_at(x - @offset_x, y - @offset_x)
  left -= 1
  top  -= 1
  off_x = x - tile_width2  + @offset_x
  off_y = y - tile_height2 + @offset_y
  alpha = (@opacity * 255).floor
  
  if @map.stagger_axis_y
    x_range = left..(left + target.width  / tile_width2  / 2 + 1).floor
    y_range =  top..(top  + target.height / tile_height2     + 3).floor
    
    y_range.each do |y2|
      x0 = @map.stagger_index_odd ^ y2.even? ? tile_width2 : 0
      x_range.each do |x2|
        image = tile_images[self[x2, y2]]
        target.draw_alpha(x0 + x2 * tile_width2 * 2 - off_x - image.width  / 2,
                               y2 * tile_height2    - off_y - image.height / 2,
                          image, alpha)
      end
    end
  else
    x_range = left..(left + target.width  / tile_width2      + 3).floor
    y_range =  top..(top  + target.height / tile_height2 / 2 + 1).floor
    
    y_range.each do |y2|
      x_range.each do |x2|
        y0 = @map.stagger_index_odd ^ x2.even? ? tile_height2 : 0
        image = tile_images[self[x2, y2]]
        target.draw_alpha(     x2 * tile_width2      - off_x - image.width  / 2,
                          y0 + y2 * tile_height2 * 2 - off_y - image.height / 2,
                          image, alpha)
      end
    end
  end
end

#vertexs(x, y) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 85

def vertexs(x, y)
  w, h = @map.tile_width / 2, @map.tile_height / 2
  if @map.stagger_axis_y
    x0 = @map.stagger_index_odd ^ y.even? ? w : 0
    return [
      [ x0 + x * w * 2 + w    , y * h         ],
      [ x0 + x * w * 2        , y * h + h     ],
      [ x0 + x * w * 2 + w    , y * h + h * 2 ],
      [ x0 + x * w * 2 + w * 2, y * h + h     ]
    ]
  else
    y0 = @map.stagger_index_odd ^ x.even? ? h : 0
    return [
      [ x * w + w    , y0 + y * h * 2         ],
      [ x * w        , y0 + y * h * 2 + h     ],
      [ x * w + w    , y0 + y * h * 2 + h * 2 ],
      [ x * w + w * 2, y0 + y * h * 2 + h     ]
    ]
  end
end

#xy_at(x, y) ⇒ Object 



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# File 'lib/dxruby_tiled/layer_staggered.rb', line 44

def xy_at(x, y)
  if @map.stagger_axis_y
    y2 = y * 2 / @map.tile_height
    x -= @map.tile_width / 2 if @map.stagger_index_odd ^ y2.even?
    x2 = x / @map.tile_width
    x0 = x % @map.tile_width
    y0 = y % (@map.tile_height / 2)
    if (y0 < @map.tile_height / 2 - x0 * @map.tile_height / @map.tile_width)
      y2 -= 1
      x2 += @map.stagger_index_odd ^ y2.even? ? -1 : 0
    elsif (y0 < x0 * @map.tile_height / @map.tile_width - @map.tile_height / 2)
      y2 -= 1
      x2 += @map.stagger_index_odd ^ y2.even? ? 0 : 1
    end
  else
    x2 = x * 2 / @map.tile_width
    y -= @map.tile_height / 2 if @map.stagger_index_odd ^ x2.even?
    y2 = y / @map.tile_height
    x0 = x % (@map.tile_width / 2)
    y0 = y % @map.tile_height
    if (y0 < @map.tile_height / 2 - x0 * @map.tile_height / @map.tile_width)
      x2 -= 1
      y2 += @map.stagger_index_odd ^ x2.even? ? -1 : 0
    elsif (y0 > x0 * @map.tile_height / @map.tile_width + @map.tile_height / 2)
      x2 -= 1
      y2 += @map.stagger_index_odd ^ x2.even? ? 0 : 1
    end
  end
  return x2, y2
end