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jaraco 17 years ago
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      lib/SVG/__init__.py

728
lib/SVG/__init__.py
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# -*- coding: UTF-8 -*-
__all__ = ( 'Plot', 'TimeSeries' )
from xml.dom import minidom as dom
from operator import itemgetter
from itertools import islice
try:
import zlib
__have_zlib = True
except ImportError:
__have_zlib = False
def sort_multiple( arrays ):
"sort multiple lists (of equal size) using the first list for the sort keys"
tuples = zip( *arrays )
tuples.sort()
return zip( *tuples )
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
"""
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
step_include_first_y_label= True
step_y_labels= 1
scale_integers= False
show_x_title= False
x_title= 'X Field names'
show_y_title= False
y_title_text_direction= 'bt' # 'bt' for bottom to top; 'tb' for top to bottom
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
top_align = top_font = right_align = right_font = 0
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.load_config( config )
self.clear_data()
def load_config( self, config ):
self.__dict__.update( config )
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'
... })
"""
self.validate_data( conf )
self.process_data( conf )
self.data.append( conf )
def validate_data( self, data ):
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"
def process_data( data ): pass
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 = self._create_element( "g" )
self.draw_graph()
self.draw_titles()
self.draw_legend()
self.draw_data()
self.graph.appendChild( self.foreground )
self.style()
data = self._doc.toprettyxml()
if hasattr( self, 'compress' ) and 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 = max( label_lengths )
max_y_label_height_px = 0.6 * max_y_label_len * self.y_label_font_size
if self.show_y_labels: bl += max_y_label_height_px
if self.stagger_y_labels: bl += max_y_label_height_px + 10
if self.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][int(x+txt_width > self.width)]
t = self._create_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 = self._create_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( self ):
transform = 'translate ( %s %s )' % ( self.border_left, self.border_top )
self.graph = self._create_element( 'g', { 'transform': transform } )
self.root.appendChild( self.graph )
self.graph.appendChild( self._create_element( 'rect', {
'x': '0',
'y': '0',
'width': str( self.graph_width ),
'height': str( self.graph_height ),
'class': 'graphBackground'
} ) )
#Axis
self.graph.appendChild( self._create_element( 'path', {
'd': 'M 0 0 v%s' % self.graph_height,
'class': 'axis',
'id': 'xAxis'
} ) )
self.graph.appendChild( self._create_element( '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 = self._create_element( 'text', {
'x': str( x ),
'y': str( y ),
'class': 'dataPointLabel',
'style': '%(style)s stroke: #fff; stroke-width: 2;' % vars(),
} )
e.appendChild( self._doc.createTextNode( str( value ) ) )
self.foreground.appendChild( e )
e = self._create_element( 'text', {
'x': str( x ),
'y': str( y ),
'class': 'dataPointLabel' } )
e.appendChild( self._doc.createTextNode( str( value ) ) )
if style: e.setAttribute( 'style', style )
self.foreground.appendChild( e )
def draw_x_labels( self ):
"Draw the X axis labels"
if self.show_x_labels:
labels = self.get_x_labels()
count = len( labels )
labels = enumerate( iter( labels ) )
start = int( not self.step_include_first_x_label )
labels = islice( labels, start, None, self.step_x_labels )
map( self.draw_x_label, labels )
self.draw_x_guidelines( self.field_width(), count )
def draw_x_label( self, label ):
label_width = self.field_width()
index, label = label
text = self._create_element( 'text', { 'class': 'xAxisLabels' } )
text.appendChild( self._doc.createTextNode( label ) )
self.graph.appendChild( text )
x = index * label_width + self.x_label_offset( label_width )
y = self.graph_height + self.x_label_font_size + 3
t = 0 - ( self.font_size / 2 )
if self.stagger_x_labels and (index % 2 ):
stagger = self.x_label_font_size + 5
y += stagger
graph_height = self.graph_height
path = self._create_element( 'path', {
'd': 'M%(x)f %(graph_height)f v%(stagger)d' % vars(),
'class': 'staggerGuideLine'
} )
self.graph.appendChild( path )
text.setAttribute( 'x', str( x ) )
text.setAttribute( 'y', str( y ) )
if self.rotate_x_labels:
transform = 'rotate( 90 %d %d ) translate( 0 -%d )' % \
( x, y-self.x_label_font_size, x_label_font_size/4 )
text.setAttribute( 'transform', transform )
text.setAttribute( 'style', 'text-anchor: start' )
else:
text.setAttribute( 'style', 'text-anchor: middle' )
def y_label_offset( self, height ):
"""Where in the Y area the label is drawn
Centered in the field, should be width/2. Start, 0."""
return 0
def get_field_width( self ):
return float( self.graph_width - self.font_size*2*self.right_font ) / \
( len( self.get_x_labels() ) - self.right_align )
field_width = property( get_field_width )
def get_field_height( self ):
return float( self.graph_height - self.font_size*2*self.top_font ) / \
( len( self.get_y_labels() ) - self.top_align )
field_height = property( get_field_height )
def draw_y_labels( self ):
"Draw the Y axis labels"
if self.show_y_labels:
labels = self.get_y_labels()
count = len( labels )
labels = enumerate( iter( labels ) )
start = int( not self.step_include_first_y_label )
labels = islice( labels, start, None, self.step_y_labels )
map( self.draw_y_label, labels )
self.draw_y_guidelines( self.field_height(), count )
def get_y_offset( self ):
#result = self.graph_height + self.y_label_offset( label_height )
result = self.graph_height + self.y_label_offset( self.field_height() )
if not self.rotate_y_labels: result += self.font_size/1.2
return result
y_offset = property( get_y_offset )
def draw_y_label( self, label ):
label_height = self.field_height()
index, label = label
text = self._create_element( 'text', { 'class': 'yAxisLabels' } )
text.appendChild( self._doc.createTextNode( label ) )
self.graph.appendChild( text )
y = self.y_offset - ( label_height * index )
x = {True: 0, False:-3}[self.rotate_y_labels]
if self.stagger_y_labels and (index % 2 ):
stagger = self.y_label_font_size + 5
x -= stagger
path = self._create_element( 'path', {
'd': 'M%(x)f %(y)f h%(stagger)d' % vars(),
'class': 'staggerGuideLine'
} )
self.graph.appendChild( path )
text.setAttribute( 'x', str( x ) )
text.setAttribute( 'y', str( y ) )
if self.rotate_y_labels:
transform = 'translate( -%d 0 ) rotate ( 90 %d %d )' % \
( self.font_size, x, y )
text.setAttribute( 'transform', transform )
text.setAttribute( 'style', 'text-anchor: middle' )
else:
text.setAttribute( 'y', str( y - self.y_label_font_size/2 ) )
text.setAttribute( 'style', 'text-anchor: end' )
def draw_x_guidelines( self, label_height, count ):
"Draw the X-axis guidelines"
if not self.show_x_guidelines: return
# skip the first one
for count in range(1,count):
start = label_height*count
stop = self.graph_height
path = self._create_element( 'path', {
'd': 'M %(start)s 0 v%(stop)s' % vars(),
'class': 'guideLines' } )
self.graph.appendChild( path )
def draw_y_guidelines( self, label_height, count ):
"Draw the Y-axis guidelines"
if not self.show_y_guidelines: return
for count in range( 1, count ):
start = self.graph_height - label_height*count
stop = self.graph_width
path = self._create_element( 'path', {
'd': 'M 0 %(start)s h%(stop)s' % vars(),
'class': 'guideLines' } )
self.graph.appendChild( path )
def draw_titles( self ):
"Draws the graph title and subtitle"
if self.show_graph_title: self.draw_graph_title()
if self.show_graph_subtitle: self.draw_graph_subtitle()
if self.show_x_title: self.draw_x_title()
if self.show_y_title: self.draw_y_title()
def draw_graph_title( self ):
text = self._create_element( 'text', {
'x': str( self.width / 2 ),
'y': str( self.title_font_size ),
'class': 'mainTitle' } )
text.appendChild( self._doc.createTextNode( self.graph_title ) )
self.root.appendChild( text )
def draw_graph_subtitle( self ):
raise NotImplementedError
def draw_x_title( self ):
raise NotImplementedError
def draw_y_title( self ):
x = self.y_title_font_size
if self.y_title_text_direction=='bt':
x += 3
rotate = -90
else:
x -= 3
rotate = 90
y = self.height / 2
text = self._create_element( 'text', {
'x': str( x ),
'y': str( y ),
'class': 'yAxisTitle',
} )
text.appendChild( self._doc.createTextNode( self.y_title ) )
text.setAttribute( 'transform', 'rotate( %(rotate)d, %(x)s, %(y)s )' % vars() )
self.root.appendChild( text )
def keys( self ):
return map( itemgetter( 'title' ), self.data )
def draw_legend( self ):
if self.key:
group = self._create_element( 'g' )
self.root.appendChild( group )
for key_count, key_name in enumerate( self.keys() ):
y_offset = ( self.KEY_BOX_SIZE * key_count ) + (key_count * 5 )
rect = self._create_element( 'rect', {
'x': '0',
'y': str( y_offset ),
'width': str( self.KEY_BOX_SIZE ),
'height': str( self.KEY_BOX_SIZE ),
'class': 'key%s' % (key_count + 1),
} )
group.appendChild( rect )
text = self._create_element( 'text', {
'x': str( self.KEY_BOX_SIZE + 5 ),
'y': str( y_offset + self.KEY_BOX_SIZE ),
'class': 'keyText' } )
text.appendChild( self._doc.createTextNode( key_name ) )
group.appendChild( text )
if self.key_position == 'right':
x_offset = self.graph_width + self.border_left + 10
y_offset = self.border_top + 20
if self.key_position == 'bottom':
raise NotImplementedError
group.setAttribute( 'transform', 'translate(%(x_offset)d %(y_offset)d)' % vars() )
def style( self ):
"hard code the styles into the xml if style sheets are not used."
if self.no_css:
styles = self.parse_css()
for node in xpath.Evaluate( '//*[@class]', self.root ):
cl = node.getAttribute( 'class' )
style = styles[ cl ]
if node.hasAttribute( 'style' ):
style += node.getAtrtibute( 'style' )
node.setAttribute( 'style', style )
def parse_css( self ):
"""Take a .css file (classes only please) and parse it into a dictionary
of class/style pairs."""
css = self.get_style()
result = {}
for match in re.finditer( '^(?<names>\.(\w+)(?:\s*,\s*\.\w+)*)\s*\{(?<content>[^}]+)\}' ):
names = match.group_dict()['names']
# apperantly, we're only interested in class names
names = filter( None, re.split( '\s*,?\s*\.' ) )
content = match.group_dict()['content']
# convert all whitespace to
content = re.sub( '\s+', ' ', content )
for name in names:
result[name] = ';'.join( result[name], content )
return result
def add_defs( self, defs ):
"Override and place code to add defs here"
pass
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.documentElement
if hasattr( self, 'style_sheet' ):
pi = self._doc.createProcessingInstruction( 'xml-stylesheet',
'href="%s" type="text/css"' % self.style_sheet )
attributes = {
'width': str( self.width ),
'height': str( self.height ),
'viewBox': '0 0 %s %s' % ( self.width, self.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' }
map( lambda a: self.root.setAttribute( *a ), attributes.items() )
self.root.appendChild( self._doc.createComment( ' Created with SVG.Graph ' ) )
self.root.appendChild( self._doc.createComment( ' SVG.Graph by Jason R. Coombs ' ) )
self.root.appendChild( self._doc.createComment( ' Based on SVG::Graph by Sean E. Russel ' ) )
self.root.appendChild( self._doc.createComment( ' Based on Perl SVG:TT:Graph by Leo Lapworth & Stephan Morgan ' ) )
self.root.appendChild( self._doc.createComment( ' '+'/'*66 ) )
defs = self._create_element( 'defs' )
self.add_defs( defs )
self.root.appendChild( defs )
if not hasattr( self, 'style_sheet' ) and not self.no_css:
self.root.appendChild( self._doc.createComment( ' include default stylesheet if none specified ' ) )
style = self._create_element( 'style', { 'type': 'text/css' } )
defs.appendChild( style )
style_data = self._doc.createCDATASection( self.get_style() )
style.appendChild( style_data )
self.root.appendChild( self._doc.createComment( 'SVG Background' ) )
rect = self._create_element( 'rect', {
'width': str( self.width ),
'height': str( self.height ),
'x': '0',
'y': '0',
'class': 'svgBackground' } )
self.root.appendChild( rect )
def calculate_graph_dimensions( self ):
self.calculate_left_margin()
self.calculate_right_margin()
self.calculate_bottom_margin()
self.calculate_top_margin()
self.graph_width = self.width - self.border_left - self.border_right
self.graph_height = self.height - self.border_top - self.border_bottom
def get_style( self ):
result = """/* 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)dpx;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.subTitle{
text-anchor: middle;
fill: #999999;
font-size: %(subtitle_font_size)dpx;
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)dpx;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.yAxisLabels{
text-anchor: end;
fill: #000000;
font-size: %(y_label_font_size)dpx;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.xAxisTitle{
text-anchor: middle;
fill: #ff0000;
font-size: %(x_title_font_size)dpx;
font-family: "Arial", sans-serif;
font-weight: normal;
}
.yAxisTitle{
fill: #ff0000;
text-anchor: middle;
font-size: %(y_title_font_size)dpx;
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;
}
%%s
.keyText{
fill: #000000;
text-anchor:start;
font-size: %(key_font_size)dpx;
font-family: "Arial", sans-serif;
font-weight: normal;
}
/* End copy for external style sheet */
""" % class_dict( self )
result = result % self.get_css()
return result
def _create_element( self, nodeName, attributes={} ):
"Create an XML node and set the attributes from a dict"
node = self._doc.createElement( nodeName )
map( lambda a: node.setAttribute( *a ), attributes.items() )
return node
class class_dict( object ):
"Emulates a dictionary, but retrieves class attributes"
def __init__( self, obj ):
self.__obj__ = obj
def __getitem__( self, item ):
return getattr( self.__obj__, item )
def keys( self ):
# dir returns a good guess of what attributes might be available
return dir( self.__obj__ )
import Plot, TimeSeries
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