Simple Pie Chart - ReportLab Snippets (Beta)

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Simple Pie Chart

Author:

rptlab

Posted:

Dec. 2, 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  
# this code was generated by Diagra, ReportLab Commercial drawing editor  
# It took only few clicks to generate the code.
from reportlab.lib.pagesizes import cm, inch
from reportlab.graphics.charts.piecharts import Pie
from reportlab.graphics.charts.legends import Legend
from reportlab.lib.colors import Color, PCMYKColor
from reportlab.graphics.shapes import Drawing, _DrawingEditorMixin

class MyDrawing(_DrawingEditorMixin,Drawing):
    def __init__(self,width=400,height=200,*args,**kw):
        apply(Drawing.__init__,(self,width,height)+args,kw)
        self._add(self,Pie(),name='chart',validate=None,desc=None)
        self.chart.x                    = 20
        self.chart.y                    = (self.height-self.chart.height)/2
        self.chart.slices.strokeWidth   = 1
        self.chart.slices.popout        = 1
        self.chart.direction            = 'clockwise'
        self.chart.width                = self.chart.height
        self.chart.startAngle           = 90
        self.chart.slices[0].popout     = 10
        self._add(self,Legend(),name='legend',validate=None,desc=None)
        self.legend.x                   = width - 20
        self.legend.y                   = 0
        self.legend.boxAnchor           = 'se'
        self.legend.subCols[1].align    = 'right'
        # these data can be read from external sources
        data                = (9, 7, 6, 4, 2.5, 1.0)
        categories          = ('A','B','C','D','E','F',)
        colors              = [PCMYKColor(0,0,0,x) for x in (100,80,60,40,20,5)]
        self.chart.data     = data
        self.chart.labels   = map(str, self.chart.data)
        self.legend.colorNamePairs = zip(colors, categories)
        for i, color in enumerate(colors): self.chart.slices[i].fillColor  = color

if __name__=="__main__":
    drawing = MyDrawing()
    # you can do all sorts of things to drawing, lets just save it as pdf and png.
    drawing.save(formats=['pdf','png'],outDir='.',fnRoot=None)

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