Class: CmdPlot::Pcolor

Inherits:
Object
  • Object
show all
Defined in:
lib/cmd_plot/pcolor.rb

Constant Summary collapse

TEXT_COLORS =

red, green, brown, blue, magenta, cyan, gray

[31, 32, 33, 34, 35, 36, 37]
FILL_SYMBOLS = 
['░', '▒', '▓', '█']
MAX_SHADES = 
TEXT_COLORS.length * FILL_SYMBOLS.length

Instance Method Summary collapse

Constructor Details

#initialize(width = 140, height = 40) ⇒ Pcolor 



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# File 'lib/cmd_plot/pcolor.rb', line 8

def initialize(width = 140, height = 40)
    @width = width
    @height = height
end

Instance Method Details

#pcolor(data, shades = nil) ⇒ Object 



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# File 'lib/cmd_plot/pcolor.rb', line 13

def pcolor(data, shades = nil)
    # Calculate scaling of data to picture
    shades = data.flatten.uniq.length if shades.nil?
    shades = MAX_SHADES if shades > MAX_SHADES or shades <= 0
    x_scale = data[0].length / @width.to_f
    y_scale = data.length / @height.to_f
    z_max = data.map { |r| r.max }.max
    z_min = data.map { |r| r.min }.min
    puts "x_scale: #{x_scale}, y_scale: #{y_scale}, z_min: #{z_min}, z_max: #{z_max}"

    # Calculcate scaled data
    scaled_data = Array.new(@height) { Array.new(@width) { 0.0 } }
    for row in 0..(scaled_data.length - 1)
        for col in 0..(scaled_data[row].length - 1)
            n = 0.0
            lower_row_idx = (row * y_scale).floor
            upper_row_idx = [lower_row_idx, ((row + 1) * y_scale).floor - 1].max
            lower_col_idx = (col * x_scale).floor
            upper_col_idx = [lower_col_idx, ((col + 1) * x_scale).floor - 1].max
            for d_row in lower_row_idx..upper_row_idx
                for d_col in lower_col_idx..upper_col_idx
                    scaled_data[row][col] += data[d_row][d_col]
                    n += 1.0
                end
            end
            if(n > 0)
                scaled_data[row][col] /= n
            else
                scaled_data[row][col] = nil
            end
        end
    end

    # Full picture starts out empty
    pic = Array.new(@height) { Array.new(@width) { nil } }
    # Run through data and fill in the plotting symbol/color
    for row in 0..(scaled_data.length - 1)
        for col in 0..(scaled_data[row].length - 1)
            val = scaled_data[row][col]
            next if val.nil?
            fill = ((val - z_min) / (z_max - z_min).to_f * (shades - 1)).round
            pic[row][col] = fill
        end
    end

    # Plot the picture
    for row in pic
        for col in row
            if col.nil?
                print ' '
            else
                color = TEXT_COLORS[col % TEXT_COLORS.length]
                sym = FILL_SYMBOLS[col / TEXT_COLORS.length]
                print "\e[#{color}m#{sym}\e[0m"
            end
        end
        print "\n"
    end
    return nil
end