Experimental!!! See also the Spider graph.
# File lib/gruff/net.rb, line 21 21: def draw 22: 23: super 24: 25: return unless @has_data 26: 27: @radius = @graph_height / 2.0 28: @center_x = @graph_left + (@graph_width / 2.0) 29: @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit 30: 31: @x_increment = @graph_width / (@column_count - 1).to_f 32: circle_radius = dot_radius || 33: clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0) 34: 35: @d = @d.stroke_opacity 1.0 36: @d = @d.stroke_width line_width || 37: clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0) 38: 39: if (defined?(@norm_baseline)) then 40: level = @graph_top + (@graph_height - @norm_baseline * @graph_height) 41: @d = @d.push 42: @d.stroke_color @baseline_color 43: @d.fill_opacity 0.0 44: @d.stroke_dasharray(10, 20) 45: @d.stroke_width 5 46: @d.line(@graph_left, level, @graph_left + @graph_width, level) 47: @d = @d.pop 48: end 49: 50: @norm_data.each do |data_row| 51: prev_x = prev_y = nil 52: @d = @d.stroke data_row[DATA_COLOR_INDEX] 53: @d = @d.fill data_row[DATA_COLOR_INDEX] 54: 55: data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index| 56: next if data_point.nil? 57: 58: rad_pos = index * Math::PI * 2 / @column_count 59: point_distance = data_point * @radius 60: start_x = @center_x + Math::sin(rad_pos) * point_distance 61: start_y = @center_y - Math::cos(rad_pos) * point_distance 62: 63: next_index = index + 1 < data_row[DATA_VALUES_INDEX].length ? index + 1 : 0 64: 65: next_rad_pos = next_index * Math::PI * 2 / @column_count 66: next_point_distance = data_row[DATA_VALUES_INDEX][next_index] * @radius 67: end_x = @center_x + Math::sin(next_rad_pos) * next_point_distance 68: end_y = @center_y - Math::cos(next_rad_pos) * next_point_distance 69: 70: @d = @d.line(start_x, start_y, end_x, end_y) 71: 72: @d = @d.circle(start_x, start_y, start_x - circle_radius, start_y) unless @hide_dots 73: end 74: 75: end 76: 77: @d.draw(@base_image) 78: end
the lines connecting in the center, with the first line vertical
# File lib/gruff/net.rb, line 82 82: def draw_line_markers 83: return if @hide_line_markers 84: 85: 86: # have to do this here (AGAIN)... see draw() in this class 87: # because this funtion is called before the @radius, @center_x and @center_y are set 88: @radius = @graph_height / 2.0 89: @center_x = @graph_left + (@graph_width / 2.0) 90: @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit 91: 92: 93: # Draw horizontal line markers and annotate with numbers 94: @d = @d.stroke(@marker_color) 95: @d = @d.stroke_width 1 96: 97: 98: (0..@column_count-1).each do |index| 99: rad_pos = index * Math::PI * 2 / @column_count 100: 101: @d = @d.line(@center_x, @center_y, @center_x + Math::sin(rad_pos) * @radius, @center_y - Math::cos(rad_pos) * @radius) 102: 103: 104: marker_label = labels[index] ? labels[index].to_s : '000' 105: 106: draw_label(@center_x, @center_y, rad_pos * 360 / (2 * Math::PI), @radius, marker_label) 107: end 108: end
# File lib/gruff/net.rb, line 112 112: def draw_label(center_x, center_y, angle, radius, amount) 113: r_offset = 1.1 114: x_offset = center_x # + 15 # The label points need to be tweaked slightly 115: y_offset = center_y # + 0 # This one doesn't though 116: x = x_offset + (radius * r_offset * Math.sin(angle.deg2rad)) 117: y = y_offset - (radius * r_offset * Math.cos(angle.deg2rad)) 118: 119: # Draw label 120: @d.fill = @marker_color 121: @d.font = @font if @font 122: @d.pointsize = scale_fontsize(20) 123: @d.stroke = 'transparent' 124: @d.font_weight = BoldWeight 125: @d.gravity = CenterGravity 126: @d.annotate_scaled(@base_image, 0, 0, x, y, amount, @scale) 127: end
Disabled; run with --debug to generate this.
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