或者，我们可以先看看Gruff都可以干什么，然后有兴趣或者有需求的就可以接着看了。
# :background_colors => %w(black grey), # :background_image => 'squirrel.png'
- Gruff::Line 就一般的线图 股市行情什么的可以用用
- Gruff::Pie Pie图 市场份额一类的比较方便
- Gruff::Bar 直方图 年份变化一类都可用
- Gruff:Area 面积图 似乎用处不大
- Gruff:Scene 场景图
- Gruff::Spider
- Gruff::Net
一些有用的参数：
# By default, labels are centered over the point they represent.
attr_accessor :center_labels_over_point
# Used internally for horizontal graph types.
attr_accessor :has_left_labels
# X轴坐标
attr_accessor :x_axis_label
# Y轴的坐标
attr_accessor :y_axis_label
# attr_accessor :x_axis_increment
# Manually set increment of the horizontal marking lines
attr_accessor :y_axis_increment
# Get or set the list of colors that will be used to draw the bars or lines.
attr_accessor :colors
# The large title of the graph displayed at the top
attr_accessor :title
# Font used for titles, labels, etc. Works best if you provide the full path to the TTF font file.
# RMagick must be built with the Freetype libraries for this to work properly.
#
# Tries to find Bitstream Vera (Vera.ttf) in the location specified by
# ENV['MAGICK_FONT_PATH']. Uses default RMagick font otherwise.
#
# The font= method below fulfills the role of the writer, so we only need
# a reader here.
attr_reader :font
attr_accessor :font_color
# Hide various elements
attr_accessor :hide_line_markers, :hide_legend, :hide_title, :hide_line_numbers
# Message shown when there is no data. Fits up to 20 characters. Defaults to "No Data."
attr_accessor :no_data_message
# The font size of the large title at the top of the graph
attr_accessor :title_font_size
# Optionally set the size of the font. Based on an 800x600px graph. Default is 20.
#
# Will be scaled down if graph is smaller than 800px wide.
attr_accessor :legend_font_size
# The font size of the labels around the graph
attr_accessor :marker_font_size
# The color of the auxiliary lines
attr_accessor :marker_color
# 设定可以显示的参考线数量
attr_accessor :marker_count
# You can manually set a minimum value instead of having the values guessed for you.
#这个很有用，我们当时就发现这里有问题
# Set it after you have given all your data to the graph object.
attr_accessor :minimum_value
# You can manually set a maximum value, such as a percentage-based graph that always goes to 100.
#
# If you use this, you must set it after you have given all your data to the graph object.
attr_accessor :maximum_value
# Set to false if you don't want the data to be sorted with largest avg values at the back.
attr_accessor :sort
# Experimental
attr_accessor :additional_line_values
# Experimental
attr_accessor :stacked
# Optionally set the size of the colored box by each item in the legend. Default is 20.0
#
# Will be scaled down if graph is smaller than 800px wide.
attr_accessor :legend_box_size
我们还用到了一个参数baseline_value，这个也郁闷了我们一段时间，设定这个值会确定一个基础线
class Gruff::Base
def setup_graph_measurements
# TODO Separate horizontal lines from line number labels so they
can be shown or hidden independently
# TODO Get width of longest left-hand vertical text label and
space left margin accordingly
unless @hide_line_markers
@graph_left = 130.0 # TODO Calculate based on string width of
labels
@graph_right_margin = 80.0 # TODO see previous line
@graph_bottom_margin = 400.0
else
@graph_left = @graph_right_margin = @graph_bottom_margin = 40
end
@graph_right = @raw_columns - @graph_right_margin
@graph_width = @raw_columns - @graph_left - @graph_right_margin
@graph_top = 150.0
@graph_bottom = @raw_rows - @graph_bottom_margin
@graph_height = @graph_bottom - @graph_top
end
def draw_label(x_offset, index)
return if @hide_line_markers
if !@labels[index].nil? && @labels_seen[index].nil?
#@d.fill = @marker_color
@d.font = @font if @font
@d.stroke = 'transparent'
@d.rotation = 90
@d.text_align( LeftAlign)
@d.font_weight = NormalWeight
@d.pointsize = scale_fontsize(@marker_font_size)
@d.gravity = NorthWestGravity #CenterGravity
@d = @d.annotate_scaled(@base_image,
1, 1000,
x_offset, @raw_rows -
(@graph_bottom_margin - 30),
@labels[index], @scale)
@d.rotation = -90
@labels_seen[index] = 1
end
end
end
- 查看图片附件