python绘图工具reportlab介绍

来源：http://blog.csdn.net/happyteafriends/article/details/9418341

转载原因：直接复制代码碰到点问题，等下记录下

官方介绍：

Generating PDFs from Wall Street to Wikipedia

We build solutions to generate rich, attractive and fully bespoke PDF documents at incredible speeds. This can let you serve personalised documents in real time, produce high-quality output, and support all kinds of delivery from web downloads through to personalised digital print.

简要来说，就是快速实时生成丰富的、定制的PDF文档。用于实时个性化定制，生成高质量的输出，支持各种交付，可以从网络下载到个人输出等。

安装：

# yum install freetype-devel.x86_64
# yum install python-devel.x86_64
# pip install reportlab

如果不安装python-devel否则报错:

# error: command 'gcc' failed with exit status 1 Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-build-root/reportlab/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-oneoII-record/install-record.txt --single-version-externally-managed failed with error code 1 in /tmp/pip-build-root/reportlab

几个例子：

坐标图：

from reportlab.lib import colors
from urllib import urlopen
from reportlab.graphics.shapes import *
from reportlab.graphics.charts.lineplots import LinePlot
from reportlab.graphics import renderPDF
URL="http://www.swpc.noaa.gov/ftpdir/weekly/Predict.txt"
COMMENT_CHARS='#:'
drawing = Drawing(400,200)
data = []
for line in urlopen(URL).readlines():
if not line.isspace() and not line[0] in COMMENT_CHARS:
data.append([float(n) for n in line.split()])
pred = [row[2] for row in data]
high = [row[3] for row in data]
low = [row[4] for row in data]
times = [row[0] + row[1]/12.0 for row in data]
lp = LinePlot()
lp.x = 50
lp.y = 50
lp.height = 125
lp.width = 300
lp.data = [zip(times,pred),zip(times,high),zip(times,low)]
drawing.add(lp)
renderPDF.drawToFile(drawing,'report.pdf','Sunspots')
def main():
return 0
if __name__ == '__main__':
main()

坐标柱状图：

from reportlab.lib.colors import Color, blue, red
from reportlab.graphics.charts.legends import Legend, TotalAnnotator
from reportlab.graphics.shapes import Drawing, _DrawingEditorMixin
from standard_colors import pdf_chart_colors, setItems
from reportlab.lib.validators import Auto
from reportlab.graphics.charts.barcharts import VerticalBarChart
class FactSheetHoldingsVBar(_DrawingEditorMixin,Drawing):
def __init__(self,width=400,height=200,*args,**kw):
apply(Drawing.__init__,(self,width,height)+args,kw)
self._add(self,VerticalBarChart(),name='bar',validate=None,desc=None)
self.bar.data = [[4.22], [4.12], [3.65], [3.56], [3.49], [3.44], [3.07], [2.84], [2.76], [1.09]]
self.bar.categoryAxis.categoryNames = ['Financials','Energy','Health Care','Telecoms','Consumer','Consumer 2','Industrials','Materials','Other','Liquid Assets']
self.bar.categoryAxis.labels.fillColor = None
self.bar.width = 200
self.bar.height = 150
self.bar.x = 30
self.bar.y = 15
self.bar.barSpacing = 5
self.bar.groupSpacing = 5
self.bar.valueAxis.labels.fontName = 'Helvetica'
self.bar.valueAxis.labels.fontSize = 8
self.bar.valueAxis.forceZero = 1
self.bar.valueAxis.rangeRound = 'both'
self.bar.valueAxis.valueMax = None#10#
self.bar.categoryAxis.visible = 1
self.bar.categoryAxis.visibleTicks = 0
self.bar.barLabels.fontSize = 6
self.bar.valueAxis.labels.fontSize = 6
self.bar.strokeWidth = 0.1
self.bar.bars.strokeWidth = 0.5
n = len(self.bar.data)
setItems(n,self.bar.bars,'fillColor',pdf_chart_colors)
#add and set up legend
self._add(self,Legend(),name='legend',validate=None,desc=None)
_ = ['Vodafone Group', 'UBS', 'British Petroleum', 'Royal bk of Scotland', 'HSBC Holdings', 'Total Elf Fina', 'Repsol', 'Novartis', 'BNP Paribas', 'Schneider Electric' ]
self.legend.colorNamePairs = [(Auto(chart=self.bar),(t,'%.2f'% d[0])) for t,d in zip(_,self.bar.data)]
self.legend.columnMaximum = 10
self.legend.fontName = 'Helvetica'
self.legend.fontSize = 5.5
self.legend.boxAnchor = 'w'
self.legend.x = 260
self.legend.y = self.height/2
self.legend.dx = 8
self.legend.dy = 8
self.legend.alignment = 'right'
self.legend.yGap = 0
self.legend.deltay = 11
self.legend.dividerLines = 1|2|4
self.legend.subCols.rpad = 10
self.legend.dxTextSpace = 5
self.legend.strokeWidth = 0
self.legend.dividerOffsY = 6
self.legend.colEndCallout = TotalAnnotator(rText='%.2f'%sum([x[0] for x in self.bar.data]), fontName='Helvetica-Bold', fontSize=self.legend.fontSize*1.1)
self.legend.colorNamePairs = [(self.bar.bars[i].fillColor, (self.bar.categoryAxis.categoryNames[i][0:20], '%0.2f' % self.bar.data[i][0])) for i in range(len(self.bar.data))]
def main():
drawing = FactSheetHoldingsVBar()
drawing.save(formats=['pdf'],outDir='.',fnRoot=None)
drawing.save(formats=['png'],outDir='.',fnRoot=None)
return 0
if __name__ == '__main__':
main()

绘制饼图：

from reportlab.graphics.charts.piecharts import Pie
from reportlab.graphics.shapes import Drawing, _DrawingEditorMixin
from reportlab.lib.colors import Color, magenta, cyan
class pietests(_DrawingEditorMixin,Drawing):
def __init__(self,width=400,height=200,*args,**kw):
Drawing.__init__(self,width,height,*args,**kw)
self._add(self,Pie(),name='pie',validate=None,desc=None)
self.pie.sideLabels = 1
self.pie.labels = ['Label 1', 'Label 2', 'Label 3', 'Label 4', 'Label 5']
self.pie.data = [20, 10, 5, 5, 5]
self.pie.width = 140
self.pie.height = 140
self.pie.y = 35
self.pie.x = 125
def main():
drawing = pietests()
# 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)
return 0
if __name__ == '__main__':
main()

效果：

官网：

http://www.reportlab.com/

文档：

http://www.reportlab.com/software/documentation/

示例：

http://www.reportlab.com/snippets/

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