Class | Gruff::SideBar |
In: |
lib/gruff/side_bar.rb
|
Parent: | Gruff::Base |
Graph with individual horizontal bars instead of vertical bars.
# File lib/gruff/side_bar.rb, line 8 8: def draw 9: @has_left_labels = true 10: super 11: 12: return unless @has_data 13: 14: # Setup spacing. 15: # 16: @bar_spacing ||= 0.9 17: 18: @bars_width = @graph_height / @column_count.to_f 19: @bar_width = @bars_width * @bar_spacing / @norm_data.size 20: @d = @d.stroke_opacity 0.0 21: height = Array.new(@column_count, 0) 22: length = Array.new(@column_count, @graph_left) 23: padding = (@bars_width * (1 - @bar_spacing)) / 2 24: 25: @norm_data.each_with_index do |data_row, row_index| 26: @d = @d.fill data_row[DATA_COLOR_INDEX] 27: 28: data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index| 29: 30: # Using the original calcs from the stacked bar chart 31: # to get the difference between 32: # part of the bart chart we wish to stack. 33: temp1 = @graph_left + (@graph_width - data_point * @graph_width - height[point_index]) 34: temp2 = @graph_left + @graph_width - height[point_index] 35: difference = temp2 - temp1 36: 37: left_x = length[point_index] - 1 38: left_y = @graph_top + (@bars_width * point_index) + (@bar_width * row_index) + padding 39: right_x = left_x + difference 40: right_y = left_y + @bar_width 41: 42: height[point_index] += (data_point * @graph_width) 43: 44: @d = @d.rectangle(left_x, left_y, right_x, right_y) 45: 46: # Calculate center based on bar_width and current row 47: label_center = @graph_top + (@bars_width * point_index + @bars_width / 2) 48: draw_label(label_center, point_index) 49: end 50: 51: end 52: 53: @d.draw(@base_image) 54: end
Draw on the Y axis instead of the X
# File lib/gruff/side_bar.rb, line 99 99: def draw_label(y_offset, index) 100: if !@labels[index].nil? && @labels_seen[index].nil? 101: @d.fill = @font_color 102: @d.font = @font if @font 103: @d.stroke = 'transparent' 104: @d.font_weight = NormalWeight 105: @d.pointsize = scale_fontsize(@marker_font_size) 106: @d.gravity = EastGravity 107: @d = @d.annotate_scaled(@base_image, 108: 1, 1, 109: -@graph_left + LABEL_MARGIN * 2.0, y_offset, 110: @labels[index], @scale) 111: @labels_seen[index] = 1 112: end 113: end
Instead of base class version, draws vertical background lines and label
# File lib/gruff/side_bar.rb, line 59 59: def draw_line_markers 60: 61: return if @hide_line_markers 62: 63: @d = @d.stroke_antialias false 64: 65: # Draw horizontal line markers and annotate with numbers 66: @d = @d.stroke(@marker_color) 67: @d = @d.stroke_width 1 68: number_of_lines = 5 69: 70: # TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc. 71: increment = significant(@maximum_value.to_f / number_of_lines) 72: (0..number_of_lines).each do |index| 73: 74: line_diff = (@graph_right - @graph_left) / number_of_lines 75: x = @graph_right - (line_diff * index) - 1 76: @d = @d.line(x, @graph_bottom, x, @graph_top) 77: diff = index - number_of_lines 78: marker_label = diff.abs * increment 79: 80: unless @hide_line_numbers 81: @d.fill = @font_color 82: @d.font = @font if @font 83: @d.stroke = 'transparent' 84: @d.pointsize = scale_fontsize(@marker_font_size) 85: @d.gravity = CenterGravity 86: # TODO Center text over line 87: @d = @d.annotate_scaled( @base_image, 88: 0, 0, # Width of box to draw text in 89: x, @graph_bottom + (LABEL_MARGIN * 2.0), # Coordinates of text 90: marker_label.to_s, @scale) 91: end # unless 92: @d = @d.stroke_antialias true 93: end 94: end