Class | Gruff::Net |
In: |
lib/gruff/net.rb
|
Parent: | Gruff::Base |
Experimental!!! See also the Spider graph.
hide_dots | [RW] | Hide parts of the graph to fit more datapoints, or for a different appearance. |
# File lib/gruff/net.rb, line 10 10: def initialize(*args) 11: super 12: 13: @hide_dots = false 14: end
# File lib/gruff/net.rb, line 16 16: def draw 17: 18: super 19: 20: return unless @has_data 21: 22: @radius = @graph_height / 2.0 23: @center_x = @graph_left + (@graph_width / 2.0) 24: @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit 25: 26: @x_increment = @graph_width / (@column_count - 1).to_f 27: circle_radius = clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0) 28: 29: @d = @d.stroke_opacity 1.0 30: @d = @d.stroke_width clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0) 31: 32: if (defined?(@norm_baseline)) then 33: level = @graph_top + (@graph_height - @norm_baseline * @graph_height) 34: @d = @d.push 35: @d.stroke_color @baseline_color 36: @d.fill_opacity 0.0 37: @d.stroke_dasharray(10, 20) 38: @d.stroke_width 5 39: @d.line(@graph_left, level, @graph_left + @graph_width, level) 40: @d = @d.pop 41: end 42: 43: @norm_data.each do |data_row| 44: prev_x = prev_y = nil 45: @d = @d.stroke data_row[DATA_COLOR_INDEX] 46: @d = @d.fill data_row[DATA_COLOR_INDEX] 47: 48: data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index| 49: next if data_point.nil? 50: 51: rad_pos = index * Math::PI * 2 / @column_count 52: point_distance = data_point * @radius 53: start_x = @center_x + Math::sin(rad_pos) * point_distance 54: start_y = @center_y - Math::cos(rad_pos) * point_distance 55: 56: next_index = index + 1 < data_row[DATA_VALUES_INDEX].length ? index + 1 : 0 57: 58: next_rad_pos = next_index * Math::PI * 2 / @column_count 59: next_point_distance = data_row[DATA_VALUES_INDEX][next_index] * @radius 60: end_x = @center_x + Math::sin(next_rad_pos) * next_point_distance 61: end_y = @center_y - Math::cos(next_rad_pos) * next_point_distance 62: 63: @d = @d.line(start_x, start_y, end_x, end_y) 64: 65: @d = @d.circle(start_x, start_y, start_x - circle_radius, start_y) unless @hide_dots 66: end 67: 68: end 69: 70: @d.draw(@base_image) 71: end
the lines connecting in the center, with the first line vertical
# File lib/gruff/net.rb, line 75 75: def draw_line_markers 76: return if @hide_line_markers 77: 78: 79: # have to do this here (AGAIN)... see draw() in this class 80: # because this funtion is called before the @radius, @center_x and @center_y are set 81: @radius = @graph_height / 2.0 82: @center_x = @graph_left + (@graph_width / 2.0) 83: @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit 84: 85: 86: # Draw horizontal line markers and annotate with numbers 87: @d = @d.stroke(@marker_color) 88: @d = @d.stroke_width 1 89: 90: 91: (0..@column_count-1).each do |index| 92: rad_pos = index * Math::PI * 2 / @column_count 93: 94: @d = @d.line(@center_x, @center_y, @center_x + Math::sin(rad_pos) * @radius, @center_y - Math::cos(rad_pos) * @radius) 95: 96: 97: marker_label = labels[index] ? labels[index].to_s : '000' 98: 99: draw_label(@center_x, @center_y, rad_pos * 360 / (2 * Math::PI), @radius, marker_label) 100: end 101: end
# File lib/gruff/net.rb, line 105 105: def draw_label(center_x, center_y, angle, radius, amount) 106: r_offset = 1.1 107: x_offset = center_x # + 15 # The label points need to be tweaked slightly 108: y_offset = center_y # + 0 # This one doesn't though 109: x = x_offset + (radius * r_offset * Math.sin(angle.deg2rad)) 110: y = y_offset - (radius * r_offset * Math.cos(angle.deg2rad)) 111: 112: # Draw label 113: @d.fill = @marker_color 114: @d.font = @font if @font 115: @d.pointsize = scale_fontsize(20) 116: @d.stroke = 'transparent' 117: @d.font_weight = BoldWeight 118: s = angle.deg2rad / (2*Math::PI) 119: @d.gravity = SouthGravity if s >= 0.96 or s < 0.04 120: @d.gravity = SouthWestGravity if s >= 0.04 or s < 0.21 121: @d.gravity = WestGravity if s >= 0.21 or s < 0.29 122: @d.gravity = NorthWestGravity if s >= 0.29 or s < 0.46 123: @d.gravity = NorthGravity if s >= 0.46 or s < 0.54 124: @d.gravity = NorthEastGravity if s >= 0.54 or s < 0.71 125: @d.gravity = EastGravity if s >= 0.71 or s < 0.79 126: @d.gravity = SouthEastGravity if s >= 0.79 or s < 0.96 127: # @d.gravity = NorthGravity 128: @d.annotate_scaled(@base_image, 0, 0, x, y, amount, @scale) 129: end