背景

看到 有人 提到pycha，說是關于用python畫圖表的。

之前也已經折騰過一個類似的，操作Excel中去畫圖表的：

【已解決】Python中處理操作Excel中的圖表（Chart，Graph）

現在這個，貌似是獨立的，畫圖表的。

pycha簡介

根據Python官網

http://pypi.python.org/pypi/pycha/

和其主頁

https://bitbucket.org/lgs/pycha/wiki/Home

的介紹:

pycha是啥

pycha是個Python模塊，用來畫圖表的的模塊。

pycha是PYthon CHArts的縮寫；

一些例子：

pycha的優點/特點

• 輕量級
• 用起來簡單
• 使用默認值，畫出來的效果就已經很好看了
• 可以自定義，定制化
• 沒打算支持所有類型的圖表，但是盡量支持最常見的，最通用的圖表

pycha的相關介紹

1.其用到了 Cairo 庫。

2. 與此類似的模塊，還有： pyCairoChart

3. Pycha基于 Plotr ，而 Plotr 又基于 PlotKit

之前其是用javascript實現的（運行在客戶端），作者希望其可以在服務端運行，所以將 Plotr 移植成用Python實現。

4. 官網文檔： http://packages.python.org/pycha

下載pycha

在

http://pypi.python.org/pypi/pycha/

中就可以找到下載地址：

pycha-0.6.0.tar.gz

下載得到pycha-0.6.0.tar.gz，解壓，得到文件夾pycha-0.6.0。

安裝pycha

安裝之前，發現此處依賴的cairo，還沒安裝，肯定待會使用也是不行的。

所以先去折騰安裝cairo，詳見：

【記錄】安裝Python版本的cairo模塊：Pycairo

安裝完畢了python版本的cairo，Pycairo后，再去繼續安裝pycha。

打開cmd，切換到對應目錄pycha-0.6.0，去執行setup.py install，此處竟然出現沒有setuptools的錯誤。

詳細折騰過程參見：

【已解決】Python中使用setup.py install去安裝別的模塊結果出錯：ImportError: No module named setuptools

然后再去安裝，就正常了：

D:\tmp\dev_tools\python\pycha\dist\pycha-0.6.0>setup.py install
running install
running bdist_egg
running egg_info
writing pycha.egg-info\PKG-INFO
writing top-level names to pycha.egg-info\top_level.txt
writing dependency_links to pycha.egg-info\dependency_links.txt
writing entry points to pycha.egg-info\entry_points.txt
reading manifest file 'pycha.egg-info\SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'pycha.egg-info\SOURCES.txt'
installing library code to build\bdist.win-amd64\egg
running install_lib
running build_py
creating build
creating build\lib
creating build\lib\pycha
copying pycha\bar.py -> build\lib\pycha
copying pycha\chart.py -> build\lib\pycha
copying pycha\color.py -> build\lib\pycha
copying pycha\line.py -> build\lib\pycha
copying pycha\pie.py -> build\lib\pycha
copying pycha\scatter.py -> build\lib\pycha
copying pycha\stackedbar.py -> build\lib\pycha
copying pycha\utils.py -> build\lib\pycha
copying pycha__init.py -> build\lib\pycha
creating build\lib\chavier
copying chavier\app.py -> build\lib\chavier
copying chavier\dialogs.py -> build\lib\chavier
copying chavier\gui.py -> build\lib\chavier
copying chavier\init.py -> build\lib\chavier
creating build\bdist.win-amd64
creating build\bdist.win-amd64\egg
creating build\bdist.win-amd64\egg\chavier
copying build\lib\chavier\app.py -> build\bdist.win-amd64\egg\chavier
copying build\lib\chavier\dialogs.py -> build\bdist.win-amd64\egg\chavier
copying build\lib\chavier\gui.py -> build\bdist.win-amd64\egg\chavier
copying build\lib\chavier\init.py -> build\bdist.win-amd64\egg\chavier
creating build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\bar.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\chart.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\color.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\line.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\pie.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\scatter.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\stackedbar.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\utils.py -> build\bdist.win-amd64\egg\pycha
copying build\lib\pycha\init.py -> build\bdist.win-amd64\egg\pycha
byte-compiling build\bdist.win-amd64\egg\chavier\app.py to app.pyc
byte-compiling build\bdist.win-amd64\egg\chavier\dialogs.py to dialogs.pyc
byte-compiling build\bdist.win-amd64\egg\chavier\gui.py to gui.pyc
byte-compiling build\bdist.win-amd64\egg\chavier\init.py to init.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\bar.py to bar.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\chart.py to chart.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\color.py to color.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\line.py to line.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\pie.py to pie.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\scatter.py to scatter.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\stackedbar.py to stackedbar.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\utils.py to utils.pyc
byte-compiling build\bdist.win-amd64\egg\pycha\init.py to init__.pyc
creating build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\PKG-INFO -> build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\SOURCES.txt -> build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\dependency_links.txt -> build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\entry_points.txt -> build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\top_level.txt -> build\bdist.win-amd64\egg\EGG-INFO
copying pycha.egg-info\zip-safe -> build\bdist.win-amd64\egg\EGG-INFO
creating dist
creating 'dist\pycha-0.6.0-py2.7.egg' and adding 'build\bdist.win-amd64\egg' to it
removing 'build\bdist.win-amd64\egg' (and everything under it)
Processing pycha-0.6.0-py2.7.egg
Copying pycha-0.6.0-py2.7.egg to d:\tmp\dev_install_root\python27_x64\lib\site-packages
Adding pycha 0.6.0 to easy-install.pth file
Installing chavier-script.pyw script to D:\tmp\dev_install_root\Python27_x64\Scripts
Installing chavier.exe script to D:\tmp\dev_install_root\Python27_x64\Scripts
Installing chavier.exe.manifest script to D:\tmp\dev_install_root\Python27_x64\Scripts

Installed d:\tmp\dev_install_root\python27_x64\lib\site-packages\pycha-0.6.0-py2.7.egg
Processing dependencies for pycha==0.6.0
Finished processing dependencies for pycha==0.6.0</pre> 
 
 使用pycha 

都安裝好了，就可以去試試效果了。
參考：
 http://packages.python.org/pycha/tutorial.html 
去寫代碼。
后來還是從：
 https://bitbucket.org/lgs/pycha/src/fa89153081d0/examples?at=default 
找到：
 https://bitbucket.org/lgs/pycha/src/fa89153081d0/examples/piechart.py?at=default 
試了試代碼：
#!/usr/bin/python

-- coding: utf-8 --
"""
Function:
【記錄】折騰Python中的一個繪制圖表的模塊：pycha
http://www.crifan.com/python_making_charts_module_pycha
Author:     Crifan Li
Version:    2013-01-04
Contact:    admin at crifan dot com
"""
import cairo;
import sys;
import cairo;
import pycha.pie;
from lines import lines;
def pycharDemo(output):
    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 800, 800)

dataSet = [(line[0], [[0, line[1]]]) for line in lines]

options = {
    'axis': {
        'x': {
            'ticks': [dict(v=i, label=d[0]) for i, d in enumerate(lines)],
        }
    },
    'legend': {
        'hide': True,
    },
    'title': 'Pie Chart',
}
chart = pycha.pie.PieChart(surface, options)

chart.addDataset(dataSet)
chart.render()

surface.write_to_png(output)


if name == 'main':
    if len(sys.argv) > 1:
        output = sys.argv[1]
    else:
        output = 'piechart.png'
    pycharDemo(output);</pre> 
 
運行結果竟然又是缺少一個lines：

D:\tmp\tmp_dev_root\python\tutorial_summary\pycha_demo>pycha_demo.py
Traceback (most recent call last):
  File "D:\tmp\tmp_dev_root\python\tutorial_summary\pycha_demo\pycha_demo.py", line 17, in <module>
    from lines import lines;
ImportError: No module named lines
 
 
所以，還得再去安裝lines：

 【已解決】Python代碼運行出錯：ImportError: No module named lines 
然后后來就是去把相關示例代碼都下載下來了：
  
此處，運行對應代碼，會生成對應的piechart.png，效果和開始官網的例子，一模一樣：
  
再去試試其他的：
barchart.py會生成兩個：
  
  
errorbarchart.py也是生成兩個：
  
  
interval.py的效果：
  
linechart.py的效果：
  
pychadownloads.py的效果：
  
scatterchart.py的效果：
  
stackedbarchart.py效果：
  
  
svg.py會生成對應的testsvg.svg，效果是：
  
test.py的效果，三個：
  
  
  
總之，效果相當的不錯。
 總結 
pycha，安裝起來，稍微有點麻煩，但是效果那是相當地不錯哇。
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