Class: Gruff::Line
Overview
Constant Summary
Constants inherited from Base
Base::DATA_COLOR_INDEX, Base::DATA_LABEL_INDEX, Base::DATA_VALUES_INDEX, Base::DATA_VALUES_X_INDEX, Base::DEBUG, Base::DEFAULT_MARGIN, Base::DEFAULT_TARGET_WIDTH, Base::LABEL_MARGIN, Base::LEGEND_MARGIN, Base::THOUSAND_SEPARATOR
Instance Attribute Summary collapse
-
#baseline_color ⇒ Object
Color of the baseline.
-
#baseline_value ⇒ Object
Draw a dashed line at the given value.
-
#dot_radius ⇒ Object
Returns the value of attribute dot_radius.
-
#hide_dots ⇒ Object
Hide parts of the graph to fit more datapoints, or for a different appearance.
-
#hide_lines ⇒ Object
Hide parts of the graph to fit more datapoints, or for a different appearance.
-
#line_width ⇒ Object
Dimensions of lines and dots; calculated based on dataset size if left unspecified.
-
#maximum_x_value ⇒ Object
Returns the value of attribute maximum_x_value.
-
#minimum_x_value ⇒ Object
accessors for support of xy data.
Attributes inherited from Base
#additional_line_values, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #label_formatting, #label_max_size, #label_stagger_height, #label_truncation_style, #labels, #left_margin, #legend_at_bottom, #legend_box_size, #legend_font_size, #legend_margin, #marker_color, #marker_count, #marker_font_size, #marker_shadow_color, #maximum_value, #minimum_value, #no_data_message, #right_margin, #show_labels_for_bar_values, #sort, #sorted_drawing, #stacked, #title, #title_font_size, #title_margin, #top_margin, #use_data_label, #x_axis_label, #y_axis_increment, #y_axis_label
Instance Method Summary collapse
- #contains_one_point_only?(data_row) ⇒ Boolean
-
#dataxy(name, x_data_points = [], y_data_points = [], color = nil) ⇒ Object
This method allows one to plot a dataset with both X and Y data.
- #draw ⇒ Object
- #get_x_coord(x_data_point, width, offset) ⇒ Object
-
#initialize(*args) ⇒ Line
constructor
Call with target pixel width of graph (800, 400, 300), and/or ‘false’ to omit lines (points only).
- #normalize(force = false) ⇒ Object
- #setup_data ⇒ Object
- #sort_norm_data ⇒ Object
Methods inherited from Base
#add_color, #data, #initialize_ivars, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #write
Methods included from Deprecated
#graph_height, #graph_left, #graph_top, #graph_width, #scale_measurements, #total_height
Constructor Details
#initialize(*args) ⇒ Line
Call with target pixel width of graph (800, 400, 300), and/or ‘false’ to omit lines (points only).
g = Gruff::Line.new(400) # 400px wide with lines
g = Gruff::Line.new(400, false) # 400px wide, no lines (for backwards compatibility)
g = Gruff::Line.new(false) # Defaults to 800px wide, no lines (for backwards compatibility)
The preferred way is to call hide_dots or hide_lines instead.
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# File 'lib/gruff/line.rb', line 42 def initialize(*args) raise ArgumentError, 'Wrong number of arguments' if args.length > 2 if args.empty? || ((not Numeric === args.first) && (not String === args.first)) super() else super args.shift end @hide_dots = @hide_lines = false @baseline_color = 'red' @baseline_value = nil @maximum_x_value = nil @minimum_x_value = nil end |
Instance Attribute Details
#baseline_color ⇒ Object
Color of the baseline
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# File 'lib/gruff/line.rb', line 20 def baseline_color @baseline_color end |
#baseline_value ⇒ Object
Draw a dashed line at the given value
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# File 'lib/gruff/line.rb', line 17 def baseline_value @baseline_value end |
#dot_radius ⇒ Object
Returns the value of attribute dot_radius.
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# File 'lib/gruff/line.rb', line 24 def dot_radius @dot_radius end |
#hide_dots ⇒ Object
Hide parts of the graph to fit more datapoints, or for a different appearance.
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# File 'lib/gruff/line.rb', line 27 def hide_dots @hide_dots end |
#hide_lines ⇒ Object
Hide parts of the graph to fit more datapoints, or for a different appearance.
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# File 'lib/gruff/line.rb', line 27 def hide_lines @hide_lines end |
#line_width ⇒ Object
Dimensions of lines and dots; calculated based on dataset size if left unspecified
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# File 'lib/gruff/line.rb', line 23 def line_width @line_width end |
#maximum_x_value ⇒ Object
Returns the value of attribute maximum_x_value.
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# File 'lib/gruff/line.rb', line 31 def maximum_x_value @maximum_x_value end |
#minimum_x_value ⇒ Object
accessors for support of xy data
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# File 'lib/gruff/line.rb', line 30 def minimum_x_value @minimum_x_value end |
Instance Method Details
#contains_one_point_only?(data_row) ⇒ Boolean
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# File 'lib/gruff/line.rb', line 226 def contains_one_point_only?(data_row) # Spin through data to determine if there is just one_value present. one_point = false data_row[DATA_VALUES_INDEX].each do |data_point| unless data_point.nil? if one_point # more than one point, bail return false end # there is at least one data point one_point = true end end one_point end |
#dataxy(name, x_data_points = [], y_data_points = [], color = nil) ⇒ Object
This method allows one to plot a dataset with both X and Y data.
Parameters are as follows:
name: string, the title of the dataset
x_data_points: an array containing the x data points for the graph
y_data_points: an array containing the y data points for the graph
color: hex number indicating the line color as an RGB triplet
or
name: string, the title of the dataset
xy_data_points: an array containing both x and y data points for the graph
color: hex number indicating the line color as an RGB triplet
Notes:
-if (x_data_points.length != y_data_points.length) an error is
returned.
-if the color argument is nil, the next color from the default theme will
be used.
-if you want to use a preset theme, you must set it before calling
dataxy().
Example:
g = Gruff::Line.new
g.title = "X/Y Dataset"
g.dataxy("Apples", [1,3,4,5,6,10], [1, 2, 3, 4, 4, 3])
g.dataxy("Bapples", [1,3,4,5,7,9], [1, 1, 2, 2, 3, 3])
g.dataxy("Capples", [[1,1],[2,3],[3,4],[4,5],[5,7],[6,9])
#you can still use the old data method too if you want:
g.data("Capples", [1, 1, 2, 2, 3, 3])
#labels will be drawn at the x locations of the keys passed in.
In this example the lables are drawn at x positions 2, 4, and 6:
g.labels = {0 => '2003', 2 => '2004', 4 => '2005', 6 => '2006'}
The 0 => '2003' label will be ignored since it is outside the chart range.
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# File 'lib/gruff/line.rb', line 91 def dataxy(name, x_data_points=[], y_data_points=[], color=nil) raise ArgumentError, 'x_data_points is nil!' if x_data_points.length == 0 if x_data_points.all? { |p| p.is_a?(Array) && p.size == 2 } x_data_points, y_data_points = x_data_points.map { |p| p[0] }, x_data_points.map { |p| p[1] } end raise ArgumentError, 'x_data_points.length != y_data_points.length!' if x_data_points.length != y_data_points.length # call the existing data routine for the y data. self.data(name, y_data_points, color) x_data_points = Array(x_data_points) # make sure it's an array # append the x data to the last entry that was just added in the @data member @data.last[DATA_VALUES_X_INDEX] = x_data_points # Update the global min/max values for the x data x_data_points.each do |x_data_point| next if x_data_point.nil? # Setup max/min so spread starts at the low end of the data points if @maximum_x_value.nil? && @minimum_x_value.nil? @maximum_x_value = @minimum_x_value = x_data_point end @maximum_x_value = (x_data_point > @maximum_x_value) ? x_data_point : @maximum_x_value @minimum_x_value = (x_data_point < @minimum_x_value) ? x_data_point : @minimum_x_value end end |
#draw ⇒ Object
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# File 'lib/gruff/line.rb', line 124 def draw super return unless @has_data # Check to see if more than one datapoint was given. NaN can result otherwise. @x_increment = (@column_count > 1) ? (@graph_width / (@column_count - 1).to_f) : @graph_width if defined?(@norm_baseline) level = @graph_top + (@graph_height - @norm_baseline * @graph_height) @d = @d.push @d.stroke_color @baseline_color @d.fill_opacity 0.0 @d.stroke_dasharray(10, 20) @d.stroke_width 5 @d.line(@graph_left, level, @graph_left + @graph_width, level) @d = @d.pop end @norm_data.each do |data_row| prev_x = prev_y = nil @one_point = contains_one_point_only?(data_row) data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index| unless data_point prev_x = prev_y = nil next end x_data = data_row[DATA_VALUES_X_INDEX] if x_data == nil #use the old method: equally spaced points along the x-axis new_x = @graph_left + (@x_increment * index) draw_label(new_x, index) else new_x = get_x_coord(x_data[index], @graph_width, @graph_left) @labels.each do |label_pos, _| draw_label(@graph_left + ((label_pos - @minimum_x_value) * @graph_width) / (@maximum_x_value - @minimum_x_value), label_pos) end end new_y = @graph_top + (@graph_height - data_point * @graph_height) # Reset each time to avoid thin-line errors @d = @d.stroke data_row[DATA_COLOR_INDEX] @d = @d.fill data_row[DATA_COLOR_INDEX] @d = @d.stroke_opacity 1.0 @d = @d.stroke_width line_width || clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0) circle_radius = dot_radius || clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0) if !@hide_lines && !prev_x.nil? && !prev_y.nil? @d = @d.line(prev_x, prev_y, new_x, new_y) elsif @one_point # Show a circle if there's just one_point @d = @d.circle(new_x, new_y, new_x - circle_radius, new_y) end @d = @d.circle(new_x, new_y, new_x - circle_radius, new_y) unless @hide_dots prev_x, prev_y = new_x, new_y end end @d.draw(@base_image) end |
#get_x_coord(x_data_point, width, offset) ⇒ Object
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# File 'lib/gruff/line.rb', line 222 def get_x_coord(x_data_point, width, offset) x_data_point * width + offset end |
#normalize(force = false) ⇒ Object
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# File 'lib/gruff/line.rb', line 200 def normalize(force=false) super(force) @norm_baseline = ((@baseline_value.to_f - @minimum_value) / @spread.to_f) if @baseline_value #normalize the x data if it is specified @data.each_with_index do |data_row, index| norm_x_data_points = [] if data_row[DATA_VALUES_X_INDEX] != nil data_row[DATA_VALUES_X_INDEX].each do |x_data_point| norm_x_data_points << ((x_data_point.to_f - @minimum_x_value.to_f) / (@maximum_x_value.to_f - @minimum_x_value.to_f)) end @norm_data[index] << norm_x_data_points end end end |
#setup_data ⇒ Object
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# File 'lib/gruff/line.rb', line 192 def setup_data if @baseline_value @maximum_value = [@maximum_value.to_f, @baseline_value.to_f].max @minimum_value = [@minimum_value.to_f, @baseline_value.to_f].min end super end |
#sort_norm_data ⇒ Object
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# File 'lib/gruff/line.rb', line 218 def sort_norm_data super unless @data.any? { |d| d[DATA_VALUES_X_INDEX] } end |