From: Jacob Fugal <lukfugl@...>
Date: 2005-10-28T04:53:50+09:00
Subject: Re: ASCII Isometric Graphics...

On 10/27/05, CBlair1986 <CBlair1986@gmail.com> wrote:
> Hello, all.
>
> I've just got a bit of a question, here. I suppose my mind's a bit too
> tired to think of a solution at the moment, but it's been on my mind
> for a while. What I'd like to do is take an array and turn it into an
> isometric view of the data, eg:
>
> [[[1,1],     # Bottom Layer
>   [1,1]],
>  [[0,1],     # Top Layer
>   [0,0]]]
>
> to
>       +-----+
>       |\     \
>       | +-----+
> +-----+ |     |
> |\     \|     |
> | +-----+-----+
> + |\     \     \
>  \| +-----+-----+
>   + |     |     |
>    \|     |     |
>     +-----+-----+
>
> The array would hold only binary data, either 1/0 or true/false.

Rather than accomadating 1/0 or true/false, I just did 1/0. Handling
both is harder than you think, given that 0 is true.

# --------------------
class Canvas
  def draw( data, x=0, y=0 )
    layers = data.size
    rows = data.map{ |layer| layer.size }.max
    columns = data.map{ |layer|
      layer.map{ |row| row.size }.max
    }.max

    @canvas = []
    (layers * 3 + rows * 2 + 1).times do |i|
      @canvas[i] = ([' '] * (columns * 6 * rows * 2 + 1)).join
    end

    @x, @y = x, y

    @y += data.size * 3
    data.each do |layer|
      @y -= 3
      draw_layer( layer )
    end

    puts @canvas.join("\n")
  end

  def draw_layer( layer )
    layer.each do |row|
      draw_row( row )
      @x += 2
      @y += 2
    end
    @x -= layer.size * 2
    @y -= layer.size * 2
  end

  def draw_row( row )
    @x += row.size * 6
    row.reverse.each do |datum|
      @x -= 6
      draw_box unless datum.zero?
    end
  end

  def draw_box
    @canvas[@y + 0][(@x + 0)..(@x + 6)] = '+-----+'
    @canvas[@y + 1][(@x + 0)..(@x + 7)] = '|\\     \\'
    @canvas[@y + 2][(@x + 0)..(@x + 8)] = '| +-----+'
    @canvas[@y + 3][(@x + 0)..(@x + 8)] = '+ |     |'
    @canvas[@y + 4][(@x + 1)..(@x + 8)] = '\\|     |'
    @canvas[@y + 5][(@x + 2)..(@x + 8)] =   '+-----+'
  end
end

data = [[[ 1, 1 ],
         [ 1, 1 ]],
        [[ 0, 1 ],
         [ 0, 0 ]]]

Canvas.new.draw( data )