Python 使用pycha畫圖表

事前準備:

下載並安裝：

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

 

簡單的程序示例如下(包括餅圖和直方圖)：

#!/usr/bin/env python

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

 

import cairo[A1] 

import pycha.pie

import pycha.bar

import pycha.stackedbar

import pycha.scatter

 

#設置畫布

def set_surface():

   width,height=700,700

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

   return surface

 

#餅圖

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')

 

#垂直立方圖

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__':

 

    #設置數據

   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))),

           )

 

    #設置圖像屬性

   options={

           'legend':{'hide':False},

           'title':'服務器銷售分佈圖(design byWoody)',

           'titleColor':'#0000ff',

           'titleFont':'字體',

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

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

           }

   surface=set_surface()

 

    #調用不同的方法生成相應的銷售圖表

   draw_pie(surface,options,dataSet)

draw_vertical_bar(surface,options,dataSet)

 

 

運行結果圖如下：

 

 

 

Python isPython!

---

 [A1]

關於Cairo:

http://www.cairographics.org/

 [A2]

關於ImageSurface:

Creates an image surface of the specifiedformat and dimensions. Initially the surface contents are all 0. (Specifically,within each pixel, each color or alpha channel belonging to format will be 0.The contents of bits within a pixel, but not belonging to the given format areundefined).

format :	format of pixels in the surface to create
width :	width of the surface, in pixels
height :	height of the surface, in pixels
Returns :	a pointer to the newly created surface. The caller owns the surface and should call cairo_surface_destroy() when done with it. This function always returns a valid pointer, but it will return a pointer to a "nil" surface if an error such as out of memory occurs. You can use cairo_surface_status() to check for this.

 

 [A3]

求解中…