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A breakdown pie chart
opensourcerl-toolkit

RLIMG: A breakdown pie chart
Author:
rptlab
Posted:
Dec. 3, 2009
Language:
Python
Tags:
opensource rl-toolkit

This shows a Pie chart with a Legend, being saved as both a bitmap for the web and a PDF chart. This code was generated using Diagra (ReportLab's commercial charts package), which allows you to define charts in a GUI. However, you don't need this package to run it, and all the chart features demonstrated are available in our open source package.

#Autogenerated by ReportLab guiedit do not edit
from reportlab.graphics.charts.piecharts import Pie
from reportlab.lib.colors import black, red, purple, green, maroon, brown, pink, white, HexColor
from reportlab.graphics.charts.legends import Legend
from reportlab.graphics.shapes import Drawing, _DrawingEditorMixin
from reportlab.lib.validators import Auto
from reportlab.lib.colors import HexColor, black

pdf_chart_colors = [
        HexColor("#0000e5"),
        HexColor("#1f1feb"),
        HexColor("#5757f0"),
        HexColor("#8f8ff5"),
        HexColor("#c7c7fa"),
        HexColor("#f5c2c2"),
        HexColor("#eb8585"),
        HexColor("#e04747"),
        HexColor("#d60a0a"),
        HexColor("#cc0000"),
        HexColor("#ff0000"),
        ]

def setItems(n, obj, attr, values):
    m = len(values)
    i = m // n
    for j in xrange(n):
        setattr(obj[j],attr,values[j*i % m])

class BreakdownPieDrawing(_DrawingEditorMixin,Drawing):
    def __init__(self,width=400,height=200,*args,**kw):
        apply(Drawing.__init__,(self,width,height)+args,kw)
        # adding a pie chart to the drawing 
        self._add(self,Pie(),name='pie',validate=None,desc=None)
        self.pie.width                  = 150
        self.pie.height                 = self.pie.width
        self.pie.x                      = 20
        self.pie.y                      = (height-self.pie.height)/2
        self.pie.data = [26.90,13.30,11.10,9.40,8.50,7.80,7.00,6.20,8.80,1.00]
        self.pie.labels = ['Financials','Energy','Health Care','Telecoms','Consumer','Consumer 2','Industrials','Materials','Other','Liquid Assets']
        self.pie.simpleLabels           = 1
        self.pie.slices.label_visible   = 0
        self.pie.slices.fontColor       = None
        self.pie.slices.strokeColor     = white
        self.pie.slices.strokeWidth     = 1
        # adding legend
        self._add(self,Legend(),name='legend',validate=None,desc=None)
        self.legend.x               = 200
        self.legend.y               = height/2
        self.legend.dx              = 8
        self.legend.dy              = 8
        self.legend.fontName        = 'Helvetica'
        self.legend.fontSize        = 7
        self.legend.boxAnchor       = 'w'
        self.legend.columnMaximum   = 10
        self.legend.strokeWidth     = 1
        self.legend.strokeColor     = black
        self.legend.deltax          = 75
        self.legend.deltay          = 10
        self.legend.autoXPadding    = 5
        self.legend.yGap            = 0
        self.legend.dxTextSpace     = 5
        self.legend.alignment       = 'right'
        self.legend.dividerLines    = 1|2|4
        self.legend.dividerOffsY    = 4.5
        self.legend.subCols.rpad    = 30
        n = len(self.pie.data)
        setItems(n,self.pie.slices,'fillColor',pdf_chart_colors)
        self.legend.colorNamePairs = [(self.pie.slices[i].fillColor, (self.pie.labels[i][0:20], '%0.2f' % self.pie.data[i])) for i in xrange(n)]

if __name__=="__main__": #NORUNTESTS
    drawing = BreakdownPieDrawing()
    # the drawing will be saved as pdf and png below, you could do other things with it obviously.
    drawing.save(formats=['pdf','png'],outDir='.',fnRoot=None)