Python 使用pycha画图表_pychart中surface=( )什么意思

事前准备:

下载并安装：

Cairo：

http://www.lfd.uci.edu/~gohlke/pythonlibs/bux9zozk/pycairo-1.10.0.win32-py2.7.exe

Pycha:

https://bitbucket.org/lgs/pycha/get/e3e270a0e7ae.zip

 

简单的程序示例如下(包括饼图和直方图)：

#!/usr/bin/env python

# -*-coding:utf-8-*-

 

import cairo[A1] 

import pycha.pie

import pycha.bar

import pycha.stackedbar

import pycha.scatter

 

#设置画布

def set_surface():

   width,height=700,700

   surface=cairo.ImageSurface(cairo.FORMAT_ARGB32,width,height)[A2] 

   return surface

 

#饼图

def draw_pie(surface,options,dataSet):

   chart=pycha.pie.PieChart(surface,options)

   chart.addDataset(dataSet)

   chart.render()[A3] 

   surface.write_to_png('D:\\Pie.png')

 

#垂直立方图

defdraw_vertical_bar(surface,options,dataSet):

   chart=pycha.bar.HorizontalBarChart(surface,options)

   chart.addDataset(dataSet)

   chart.render()

   surface.write_to_png('d:\\VerticalBar.png')

 

 

if __name__=='__main__':

 

    #设置数据

   dataSet=(

           ('IBM',((1,3),(2,4),(3,6))),

           ('HP',((1,3.3),(2.1,4.3),(2,5))),

           ('DELL',((2,3.3),(3.1,3.3),(3,5))),

           )

 

    #设置图像属性

   options={

           'legend':{'hide':False},

           'title':'服务器销售分布图(design byWoody)',

           'titleColor':'#0000ff',

           'titleFont':'字体',

           'background':{'chartColor':'#00fff0'},

           'axis':{'labelColor':'#ff000'},

           }

   surface=set_surface()

 

    #调用不同的方法生成相应的销售图表

   draw_pie(surface,options,dataSet)

draw_vertical_bar(surface,options,dataSet)

 

 

运行结果图如下：

 

 

 

Python isPython!