vtk类之vtkEarthSource：生成地球的多边形

vtkEarthSource 数据源，用圆球形的样式来生产地铁的版块轮廓形状。

基本方法：

virtual void	SetRadius (double)
virtual double	GetRadius ()
virtual void	SetOnRatio (int)
virtual int	GetOnRatio ()

Radius 设置地球的半径长度

OnRatio 设置地球显示的精确程度 0~16， 值越小，显示越精确。

例子：

#-*- coding: UTF-8 -*-
#-------------------------------------------------------------------------------
# Name:        模块2
# Purpose:
#
# Author:      Administrator
#
# Created:     06-12-2012
# Copyright:   (c) Administrator 2012
# Licence:     <your licence>
#-------------------------------------------------------------------------------

from ActorFactory import ActorFactory

from vtk import *
## @detal 地球类
class EarthActorFactory(ActorFactory):
    def __init__(self):
        ActorFactory.__init__(self)        
        self.__EarthSource = vtkEarthSource()        
        
    def _MakeActors(self):
        self.__EarthSource.SetRadius(20)
        self.__EarthSource.SetOutline(0)
        self.__EarthSource.SetOnRatio(0)
        self.__EarthSource.OutlineOn()
        
        polyDataMapper = vtkPolyDataMapper()
        polyDataMapper.SetInput(self.__EarthSource.GetOutput())
        
        actor = self._NewActor()
        actor.SetMapper(polyDataMapper)
        actor.GetProperty().SetColor((0.5, 0.7, 0.2))
        
        return [actor]
    
    def __del__(self):
        del self.__EarthSource
        

设置精密度位16时的效果：

self.__EarthSource.SetOnRatio(16)