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Beginning of SVG library as ported from the Ruby SVG::Graph library.

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SANDIA\jaraco 19 years ago
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      __init__.py

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__init__.py
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#!/usr/bin/env python
from xml.dom import minidom as dom
try:
import zlib
__have_zlib = True
except ImportError:
__have_zlib = False
def CreateElement( nodeName, attributes={} ):
"Create an XML node and set the attributes from a dict"
node = dom.Element( nodeName )
map( lambda a: node.setAttribute( *a ), attributes.items() )
return node
class Graph( object ):
"""=== Base object for generating SVG Graphs
== Synopsis
This class is only used as a superclass of specialized charts. Do not
attempt to use this class directly, unless creating a new chart type.
For examples of how to subclass this class, see the existing specific
subclasses, such as SVG.Pie.
== Examples
For examples of how to use this package, see either the test files, or
the documentation for the specific class you want to use.
* file:test/plot.rb
* file:test/single.rb
* file:test/test.rb
* file:test/timeseries.rb
== Description
This package should be used as a base for creating SVG graphs.
== Acknowledgements
Sean E. Russel for creating the SVG::Graph Ruby package from which this
Python port is derived.
Leo Lapworth for creating the SVG::TT::Graph package which the Ruby
port is based on.
Stephen Morgan for creating the TT template and SVG.
== See
* SVG.BarHorizontal
* SVG.Bar
* SVG.Line
* SVG.Pie
* SVG.Plot
* SVG.TimeSeries
== Author
Jason R. Coombs <jaraco@jaraco.com>
Copyright 2005 Sandia National Laboratories
"""
defaults = {
'width': 500,
'height': 300,
'show_x_guidelines': False,
'show_y_guidelines': True,
'show_data_values': True,
'min_scale_value': 0,
'show_x_labels': True,
'stagger_x_labels': False,
'rotate_x_labels': False,
'step_x_labels': 1,
'step_include_first_x_label': True,
'show_y_labels': True,
'rotate_y_labels': False,
'stagger_y_labels': False,
'scale_integers': False,
'show_x_title': False,
'x_title': 'X Field names',
'show_y_title': False,
'y_title_text_direction': 'bt',
'y_title': 'Y Scale',
'show_graph_title': False,
'graph_title': 'Graph Title',
'show_graph_subtitle': False,
'graph_subtitle': 'Graph Subtitle',
'key': True,
'key_position': 'right', # 'bottom' or 'right',
'font_size': 12,
'title_font_size': 16,
'subtitle_font_size': 14,
'x_label_font_size': 12,
'x_title_font_size': 14,
'y_label_font_size': 12,
'y_title_font_size': 14,
'key_font_size': 10,
'no_css': False,
'add_popups': False,
}
#__slots__ = tuple( defaults ) + ( '__dict__', '__weakref__' )
def __init__( self, config ):
"""Initialize the graph object with the graph settings. You won't
instantiate this class directly; see the subclass for options.
"""
self.top_align = self.top_font = self.right_align = self.right_font = 0
self.load_config()
self.load_config( config )
self.clear_data()
def load_config( self, config = None ):
if not config: config = self.defaults
map( lambda pair: setattr( self, *pair ), config.items() )
def add_data( self, conf ):
"""This method allows you do add data to the graph object.
It can be called several times to add more data sets in.
>>> data_sales_02 = [12, 45, 21]
>>> graph.add_data({
... 'data': data_sales_02,
... 'title': 'Sales 2002'
... })
"""
try:
assert( isinstance( conf['data'], ( tuple, list ) ) )
except TypeError, e:
raise TypeError, "conf should be dictionary with 'data' and other items"
except AssertionError:
if not hasattr( conf['data'], '__iter__' ):
raise TypeError, "conf['data'] should be tuple or list or iterable"
self.data.append( conf )
def clear_data( self ):
"""This method removes all data from the object so that you can
reuse it to create a new graph but with the same config options.
>>> graph.clear_data()
"""
self.data = []
def burn( self ):
""" # This method processes the template with the data and
config which has been set and returns the resulting SVG.
This method will croak unless at least one data set has
been added to the graph object.
Ex: graph.burn()
"""
if not self.data: raise ValueError( "No data available" )
if hasattr( self, 'calculations' ): self.calculations()
self.start_svg()
self.calculate_graph_dimensions()
self.foreground = dom.Element( "g" )
self.draw_graph()
self.draw_titles()
self.draw_legend()
self.draw_data()
self.graph.add_element( self.foreground )
self.style()
data = self._doc.toprettyxml()
if self.compress:
if __have_zlib:
data = zlib.compress( data )
else:
data += '<!-- Python zlib not available for SVGZ -->'
return data
KEY_BOX_SIZE = 12
def calculate_left_margin( self ):
"""Override this (and call super) to change the margin to the left
of the plot area. Results in border_left being set."""
bl = 7
# Check for Y labels
if self.rotate_y_labels:
max_y_label_height_px = self.y_label_font_size
else:
label_lengths = map( len, self.get_y_labels() )
max_y_label_len = reduce( max, label_lengths )
max_y_label_height_px = 0.6 * max_y_label_len * self.y_label_font_size
if show_y_labels: bl += max_y_label_height_px
if stagger_y_labels: bl += max_y_label_height_px + 10
if show_y_title: bl += self.y_title_font_size + 5
self.border_left = bl
def max_y_label_width_px( self ):
"""Calculates the width of the widest Y label. This will be the
character height if the Y labels are rotated."""
if self.rotate_y_labels:
return self.font_size
def calculate_right_margin( self ):
"""Override this (and call super) to change the margin to the right
of the plot area. Results in border_right being set."""
br = 7
if self.key and self.key_position == 'right':
max_key_len = max( map( len, self.keys ) )
br += max_key_len * self.key_font_size * 0.6
br += self.KEY_BOX_SIZE
br += 10 # Some padding around the box
self.border_right = br
def calculate_top_margin( self ):
"""Override this (and call super) to change the margin to the top
of the plot area. Results in border_top being set."""
self.border_top = 5
if self.show_graph_title: self.border_top += self.title_font_size
self.border_top += 5
if self.show_graph_subtitle: self.border_top += self.subtitle_font_size
def add_popup( self, x, y, label ):
"Adds pop-up point information to a graph."
txt_width = len( label ) * self.font_size * 0.6 + 10
tx = x + [5,-5](x+txt_width > width)
t = dom.Element( 'text' )
anchor = ['start', 'end'][x+txt_width > self.width]
style = 'fill: #000; text-anchor: %s;' % anchor
id = 'label-%s' % label
attributes = { 'x': str( tx ),
'y': str( y - self.font_size ),
'visibility': 'hidden',
'style': style,
'text': label,
'id': id
}
map( lambda a: t.setAttribute( *a ), attributes.items() )
self.foreground.appendChild( t )
visibility = "document.getElementById(%s).setAttribute('visibility', %%s )" % id
t = dom.Element( 'circle' )
attributes = { 'cx': str( x ),
'cy': str( y ),
'r': 10,
'style': 'opacity: 0;',
'onmouseover': visibility % 'visible',
'onmouseout': visibility % 'hidden',
}
map( lambda a: t.setAttribute( *a ), attributes.items() )
def calculate_bottom_margin( self ):
"""Override this (and call super) to change the margin to the bottom
of the plot area. Results in border_bottom being set."""
bb = 7
if self.key and self.key_position == 'bottom':
bb += len( self.data ) * ( self.font_size + 5 )
bb += 10
if self.show_x_labels:
max_x_label_height_px = self.x_label_font_size
if self.rotate_x_labels:
label_lengths = map( len, self.get_x_labels() )
max_x_label_len = reduce( max, label_lengths )
max_x_label_height_px *= 0.6 * max_x_label_len
bb += max_x_label_height_px
if self.stagger_x_labels: bb += max_x_label_height_px + 10
if self.show_x_title: bb += self.x_title_font_size + 5
self.border_bottom = bb
def draw_graph:
transform = 'translate ( %s %s )' % ( self.border_left, self.border_top )
self.graph = CreateElement( 'g', { 'transform': transform } )
self.root.appendChild( self.graph )
self.graph.appendChild( CreateElement( 'rect', {
'x': '0',
'y': '0',
'width': str( self.graph_width )
'height': str( self.graph_height )
'class': 'graphBackground'
} ) )
#Axis
self.graph.appendChild( CreateElement( 'path', {
'd': 'M 0 0 v%s' % self.graph_height,
'class': 'axis',
'id': 'xAxis'
} ) )
self.graph.appendChild( CreateElement( 'path', {
'd': 'M 0 %s h%s' % ( self.graph_height, self.graph_width ),
'class': 'axis',
'id': 'yAxis'
} ) )
self.draw_x_labels()
self.draw_y_labels()
def x_label_offset( self, width ):
"""Where in the X area the label is drawn
Centered in the field, should be width/2. Start, 0."""
return 0
def make_datapoint_text( self, x, y, value, style='' ):
if self.show_data_values:
e = CreateElement( 'text', {
'x': str( x ),
'y': str( y ),
'class': 'dataPointLabel',
'style': '%(style)s stroke: #fff; stroke-width: 2;' % vars(),
} )
e.nodeValue = value
self.foreground.appendChild( e )
def draw_x_labels( self ):
"Draw the X axis labels"
stagger = self.x_label_font_size + 5
if self.show_x_labels:
label_width = self.field_width
labels = self.get_x_labels()
count = len( labels )
labels = enumerate( iter( labels ) )
start = int( !self.step_include_first_x_label )
labels = itertools.islice( labels, start, None, self.step_x_labels )
map( self.draw_x_label, labels )
self.draw_x_guidelines( label_width, count )
def draw_x_label( self, label ):
index, label = label
text = CreateElement( 'text', { 'class': 'xAxisLabels' } )
self.graph.appendChild( text )
def start_svg( self ):
"Base SVG Document Creation"
impl = dom.getDOMImplementation()
#dt = impl.createDocumentType( 'svg', 'PUBLIC'
self._doc = impl.createDocument( None, 'svg', None )
self.root = self._doc.getDocumentElement()
ruby = """
# Draws the background, axis, and labels.
def draw_graph
@graph = @root.add_element( "g", {
"transform" => "translate( #@border_left #@border_top )"
})
# Background
@graph.add_element( "rect", {
"x" => "0",
"y" => "0",
"width" => @graph_width.to_s,
"height" => @graph_height.to_s,
"class" => "graphBackground"
})
# Axis
@graph.add_element( "path", {
"d" => "M 0 0 v#@graph_height",
"class" => "axis",
"id" => "xAxis"
})
@graph.add_element( "path", {
"d" => "M 0 #@graph_height h#@graph_width",
"class" => "axis",
"id" => "yAxis"
})
draw_x_labels
draw_y_labels
end
# Where in the X area the label is drawn
# Centered in the field, should be width/2. Start, 0.
def x_label_offset( width )
0
end
def make_datapoint_text( x, y, value, style="" )
if show_data_values
@foreground.add_element( "text", {
"x" => x.to_s,
"y" => y.to_s,
"class" => "dataPointLabel",
"style" => "#{style} stroke: #fff; stroke-width: 2;"
}).text = value.to_s
text = @foreground.add_element( "text", {
"x" => x.to_s,
"y" => y.to_s,
"class" => "dataPointLabel"
})
text.text = value.to_s
text.attributes["style"] = style if style.length > 0
end
end
# Draws the X axis labels
def draw_x_labels
stagger = x_label_font_size + 5
if show_x_labels
label_width = field_width
count = 0
for label in get_x_labels
if step_include_first_x_label == true then
step = count % step_x_labels
else
step = (count + 1) % step_x_labels
end
if step == 0 then
text = @graph.add_element( "text" )
text.attributes["class"] = "xAxisLabels"
text.text = label.to_s
x = count * label_width + x_label_offset( label_width )
y = @graph_height + x_label_font_size + 3
t = 0 - (font_size / 2)
if stagger_x_labels and count % 2 == 1
y += stagger
@graph.add_element( "path", {
"d" => "M#{x} #@graph_height v#{stagger}",
"class" => "staggerGuideLine"
})
end
text.attributes["x"] = x.to_s
text.attributes["y"] = y.to_s
if rotate_x_labels
text.attributes["transform"] =
"rotate( 90 #{x} #{y-x_label_font_size} )"+
" translate( 0 -#{x_label_font_size/4} )"
text.attributes["style"] = "text-anchor: start"
else
text.attributes["style"] = "text-anchor: middle"
end
end
draw_x_guidelines( label_width, count ) if show_x_guidelines
count += 1
end
end
end
# Where in the Y area the label is drawn
# Centered in the field, should be width/2. Start, 0.
def y_label_offset( height )
0
end
def field_width
(@graph_width.to_f - font_size*2*right_font) /
(get_x_labels.length - right_align)
end
def field_height
(@graph_height.to_f - font_size*2*top_font) /
(get_y_labels.length - top_align)
end
# Draws the Y axis labels
def draw_y_labels
stagger = y_label_font_size + 5
if show_y_labels
label_height = field_height
count = 0
y_offset = @graph_height + y_label_offset( label_height )
y_offset += font_size/1.2 unless rotate_y_labels
for label in get_y_labels
y = y_offset - (label_height * count)
x = rotate_y_labels ? 0 : -3
if stagger_y_labels and count % 2 == 1
x -= stagger
@graph.add_element( "path", {
"d" => "M#{x} #{y} h#{stagger}",
"class" => "staggerGuideLine"
})
end
text = @graph.add_element( "text", {
"x" => x.to_s,
"y" => y.to_s,
"class" => "yAxisLabels"
})
text.text = label.to_s
if rotate_y_labels
text.attributes["transform"] = "translate( -#{font_size} 0 ) "+
"rotate( 90 #{x} #{y} ) "
text.attributes["style"] = "text-anchor: middle"
else
text.attributes["y"] = (y - (y_label_font_size/2)).to_s
text.attributes["style"] = "text-anchor: end"
end
draw_y_guidelines( label_height, count ) if show_y_guidelines
count += 1
end
end
end
# Draws the X axis guidelines
def draw_x_guidelines( label_height, count )
if count != 0
@graph.add_element( "path", {
"d" => "M#{label_height*count} 0 v#@graph_height",
"class" => "guideLines"
})
end
end
# Draws the Y axis guidelines
def draw_y_guidelines( label_height, count )
if count != 0
@graph.add_element( "path", {
"d" => "M0 #{@graph_height-(label_height*count)} h#@graph_width",
"class" => "guideLines"
})
end
end
# Draws the graph title and subtitle
def draw_titles
if show_graph_title
@root.add_element( "text", {
"x" => (width / 2).to_s,
"y" => (title_font_size).to_s,
"class" => "mainTitle"
}).text = graph_title.to_s
end
if show_graph_subtitle
y_subtitle = show_graph_title ?
title_font_size + 10 :
subtitle_font_size
@root.add_element("text", {
"x" => (width / 2).to_s,
"y" => (y_subtitle).to_s,
"class" => "subTitle"
}).text = graph_subtitle.to_s
end
if show_x_title
y = @graph_height + @border_top + x_title_font_size
if show_x_labels
y += x_label_font_size + 5 if stagger_x_labels
y += x_label_font_size + 5
end
x = width / 2
@root.add_element("text", {
"x" => x.to_s,
"y" => y.to_s,
"class" => "xAxisTitle",
}).text = x_title.to_s
end
if show_y_title
x = y_title_font_size + (y_title_text_direction==:bt ? 3 : -3)
y = height / 2
text = @root.add_element("text", {
"x" => x.to_s,
"y" => y.to_s,
"class" => "yAxisTitle",
})
text.text = y_title.to_s
if y_title_text_direction == :bt
text.attributes["transform"] = "rotate( -90, #{x}, #{y} )"
else
text.attributes["transform"] = "rotate( 90, #{x}, #{y} )"
end
end
end
def keys
return @data.collect{ |d| d[:title] }
end
# Draws the legend on the graph
def draw_legend
if key
group = @root.add_element( "g" )
key_count = 0
for key_name in keys
y_offset = (KEY_BOX_SIZE * key_count) + (key_count * 5)
group.add_element( "rect", {
"x" => 0.to_s,
"y" => y_offset.to_s,
"width" => KEY_BOX_SIZE.to_s,
"height" => KEY_BOX_SIZE.to_s,
"class" => "key#{key_count+1}"
})
group.add_element( "text", {
"x" => (KEY_BOX_SIZE + 5).to_s,
"y" => (y_offset + KEY_BOX_SIZE).to_s,
"class" => "keyText"
}).text = key_name.to_s
key_count += 1
end
case key_position
when :right
x_offset = @graph_width + @border_left + 10
y_offset = @border_top + 20
when :bottom
x_offset = @border_left + 20
y_offset = @border_top + @graph_height + 5
if show_x_labels
max_x_label_height_px = rotate_x_labels ?
get_x_labels.max{|a,b|
a.length<=>b.length
}.length * x_label_font_size :
x_label_font_size
y_offset += max_x_label_height_px
y_offset += max_x_label_height_px + 5 if stagger_x_labels
end
y_offset += x_title_font_size + 5 if show_x_title
end
group.attributes["transform"] = "translate(#{x_offset} #{y_offset})"
end
end
private
def sort_multiple( arrys, lo=0, hi=arrys[0].length-1 )
if lo < hi
p = partition(arrys,lo,hi)
sort_multiple(arrys, lo, p-1)
sort_multiple(arrys, p+1, hi)
end
arrys
end
def partition( arrys, lo, hi )
p = arrys[0][lo]
l = lo
z = lo+1
while z <= hi
if arrys[0][z] < p
l += 1
arrys.each { |arry| arry[z], arry[l] = arry[l], arry[z] }
end
z += 1
end
arrys.each { |arry| arry[lo], arry[l] = arry[l], arry[lo] }
l
end
def style
if no_css
styles = parse_css
@root.elements.each("//*[@class]") { |el|
cl = el.attributes["class"]
style = styles[cl]
style += el.attributes["style"] if el.attributes["style"]
el.attributes["style"] = style
}
end
end
def parse_css
css = get_style
rv = {}
while css =~ /^(\.(\w+)(?:\s*,\s*\.\w+)*)\s*\{/m
names_orig = names = $1
css = $'
css =~ /([^}]+)\}/m
content = $1
css = $'
nms = []
while names =~ /^\s*,?\s*\.(\w+)/
nms << $1
names = $'
end
content = content.tr( "\n\t", " ")
for name in nms
current = rv[name]
current = current ? current+"; "+content : content
rv[name] = current.strip.squeeze(" ")
end
end
return rv
end
# Override and place code to add defs here
def add_defs defs
end
def start_svg
# Base document
@doc = Document.new
@doc << XMLDecl.new
@doc << DocType.new( %q{svg PUBLIC "-//W3C//DTD SVG 1.0//EN" } +
%q{"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"} )
if style_sheet && style_sheet != ''
@doc << ProcessingInstruction.new( "xml-stylesheet",
%Q{href="#{style_sheet}" type="text/css"} )
end
@root = @doc.add_element( "svg", {
"width" => width.to_s,
"height" => height.to_s,
"viewBox" => "0 0 #{width} #{height}",
"xmlns" => "http://www.w3.org/2000/svg",
"xmlns:xlink" => "http://www.w3.org/1999/xlink",
"xmlns:a3" => "http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/",
"a3:scriptImplementation" => "Adobe"
})
@root << Comment.new( " "+"\\"*66 )
@root << Comment.new( " Created with SVG::Graph " )
@root << Comment.new( " SVG::Graph by Sean E. Russell " )
@root << Comment.new( " Losely based on SVG::TT::Graph for Perl by"+
" Leo Lapworth & Stephan Morgan " )
@root << Comment.new( " "+"/"*66 )
defs = @root.add_element( "defs" )
add_defs defs
if not(style_sheet && style_sheet != '') and !no_css
@root << Comment.new(" include default stylesheet if none specified ")
style = defs.add_element( "style", {"type"=>"text/css"} )
style << CData.new( get_style )
end
@root << Comment.new( "SVG Background" )
@root.add_element( "rect", {
"width" => width.to_s,
"height" => height.to_s,
"x" => "0",
"y" => "0",
"class" => "svgBackground"
})
end
def calculate_graph_dimensions
calculate_left_margin
calculate_right_margin
calculate_bottom_margin
calculate_top_margin
@graph_width = width - @border_left - @border_right
@graph_height = height - @border_top - @border_bottom
end
def get_style
return <<EOL
/* Copy from here for external style sheet */
.svgBackground{
fill:#ffffff;
}
.graphBackground{
fill:#f0f0f0;
}
/* graphs titles */
.mainTitle{
text-anchor: middle;
fill: #000000;
font-size: #{title_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.subTitle{
text-anchor: middle;
fill: #999999;
font-size: #{subtitle_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.axis{
stroke: #000000;
stroke-width: 1px;
}
.guideLines{
stroke: #666666;
stroke-width: 1px;
stroke-dasharray: 5 5;
}
.xAxisLabels{
text-anchor: middle;
fill: #000000;
font-size: #{x_label_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.yAxisLabels{
text-anchor: end;
fill: #000000;
font-size: #{y_label_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.xAxisTitle{
text-anchor: middle;
fill: #ff0000;
font-size: #{x_title_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.yAxisTitle{
fill: #ff0000;
text-anchor: middle;
font-size: #{y_title_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.dataPointLabel{
fill: #000000;
text-anchor:middle;
font-size: 10px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.staggerGuideLine{
fill: none;
stroke: #000000;
stroke-width: 0.5px;
}
#{get_css}
.keyText{
fill: #000000;
text-anchor:start;
font-size: #{key_font_size}px;
font-family: "Arial", sans-serif;
font-weight: normal;
}
/* End copy for external style sheet */
EOL
end
end
end
end
"""
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