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1  \chapter{The module \pyvisi}  \chapter{The module \pyvisi}
2                                                                                                                                                                                                        \label{PYVISI CHAP}
 \declaremodule{extension}{pyvisi}  
 \modulesynopsis{visualization interface}  
   
 The idea behind is to provide an easy to use interface and unified to a variety of  
 visualization tools like \VTK, \OpenDX and \GnuPlot.  
   
 The following script illustartes the usage of \pyvisi together with the  
 \VTK library:  
 \begin{python}  
 from esys.pyvisi import *                # base level visualisation stuff  
 from esys.pyvisi.renderers.vtk import *  # vtk renderer module  
 from esys.escript import *  
 from esys.finley import Brick  
 # now make some data of some kind  
 domain = Brick(3,5,7)  # a Finley domain  
 vectorData = domain.getX()  # get vector data from the domain nodes  
 # define the scene object  
 scene = Scene()  
 # create an ArrowPlot object  
 plot = ArrowPlot(scene)  
 # add the plot to the scene  
 scene.add(plot)  
 # assign some data to the plot  
 plot.setData(vectorData)  
 # render the scene  
 scene.render()  
 # saving a scene  
 scene.save(file="example.jpg", format="jpeg")  
 \begin{python}  
 A \Scene is a container for all of the kinds of things you want to put into your plot,  
 for instance, images, domaines, arrow plots, contour plots, spheres etc.  
 The renderer is specified in the scene initialisation. In fact the  
 \code{from esys.pyvisi.renderers.vtk import *} provides the specific implementation for  
 \VTK  
   
   
 \begin{verbose}  
 class ArrowPlot3D(Plot):  
     """  
     Arrow field plot in three dimensions  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the ArrowPlot3D class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of extra options  
         @type options: dict  
   
         @param fname: Filename of the input vtk file  
         @type fname: string  
   
         @param format: Format of the input vtk file ('vtk' or 'vtk-xml')  
         @type format: string  
   
     @param vectors: the name of the vector data in the vtk file to use  
     @type vectors: string  
         """  
 class ArrowPlot(Plot):  
     """  
     Arrow field plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the ArrowPlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
     @param options: Dictionary of extra options  
     @type options: dict  
   
     @param fname: the name of the input vtk file  
     @type fname: string  
   
     @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
     @type format: string  
   
     @param vectors: the name of the vector data in the vtk file to use  
     @type vectors: string  
         """  
 class Axes(Plot):  
     """  
     Axes class  
     """  
     def __init__(self):  
         """  
         Initialisation of Axes object  
         """  
         debugMsg("Called Axes.__init__()")  
         Plot.__init__(self)  
   
 class BallPlot(Plot):  
     """  
     Ball plot  
     """  
     def __init__(self, scene):  
   
     def setData(self, points=None,  
             fname=None, format=None,  
             radii=None, colors=None, tags=None):  
         """  
         Set data to the plot  
         @param points: the array to use for the points of the sphere  
         locations in space  
         @type points: float array  
   
         @param fname: the name of the input vtk file  
         @type fname: string  
   
         @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
         @type format: string  
   
         @param radii: the name of the scalar array in the vtk unstructured  
         grid to use as the radii of the balls  
         @type radii: float array  
   
         @param colors: the name of the scalar array in the vtk unstructured  
         grid to use as the colour tags of the balls  
         @type colors: string  
   
         @param tags: the name of the scalar array in the vtk unstructured  
         grid to use as the colour of the tags of the balls  
         @type tags: integer array  
         """  
   
 class Box(Item):  
     """  
     Generic class for Box objects  
   
     To define a box one specify one of three groups of things:  
       - The bounds of the box: xmin, xmax, ymin, ymax, zmin, zmax  
       - The dimensions and origin: width, height, depth and origin  
       - The bottom left front and top right back corners: blf, trb  
     """  
   
     def __init__(self):  
         """  
         Initialisation of the Box object  
         """  
         debugMsg("Called Box.__init__()")  
         Item.__init__(self)  
   
         # define a box in many ways, either by its centre and width, height  
         # and depth, or by its bounds, xmin, xmax, ymin, ymax, zmin, zmax,  
         # or by its bottom left front and top right back points.  
   
         # set the default bounds  
         self.xmin = -0.5  
         self.xmax = 0.5  
         self.ymin = -0.5  
         self.ymax = 0.5  
         self.zmin = -0.5  
         self.zmax = 0.5  
   
         # set the default origin (the centre of the box)  
         self.origin = ((self.xmin + self.xmax)/2.0,  
                 (self.ymin + self.ymax)/2.0,  
                 (self.zmin + self.zmax)/2.0)  
   
         # set the default dimensions  
         self.width = self.xmax - self.xmin  
         self.height = self.ymax - self.ymin  
         self.depth = self.zmax - self.zmin  
   
         # set the default blf and trb points  
         self.blf = (self.xmin, self.ymin, self.zmin)  
         self.trb = (self.xmax, self.ymax, self.zmax)  
   
         # tolerance for calculated variables checking purposes  
         self.tolerance = 1e-8  
   
     def setBounds(self, xmin, xmax, ymin, ymax, zmin, zmax):  
         """  
         Set the bounds of the box  
         """  
     def getBounds(self):  
         """  
         Get the current bounds of the box  
         """  
   
     def setOrigin(self, xo, yo, zo):  
         """  
         Set the origin of the box  
         """  
     def getOrigin(self):  
         """  
         Get the current origin of the box  
         """  
         debugMsg("Called Box.getOrigin()")  
         return self.origin  
   
     def setWidth(self, width):  
         """  
         Set the width of the box  
         """  
     def getWidth(self):  
         """  
         Get the current box width  
         """  
         debugMsg("Called Box.getWidth()")  
         return self.width  
   
     def setHeight(self, height):  
         """  
         Set the box height  
         """  
   
     def getHeight(self):  
         """  
         Get the current box height  
         """  
         debugMsg("Called Box.getHeight()")  
         return self.height  
   
     def setDepth(self, depth):  
         """  
         Set the box depth  
         """  
   
     def getDepth(self):  
         """  
         Get the current box depth  
         """  
         debugMsg("Called Box.getDepth()")  
         return self.depth  
   
     def setBLF(self, bottom, left, front):  
         """  
         Set the position of the bottom, left, front corner  
         """  
   
     def getBLF(self):  
         """  
         Get the current position of the bottom, left, front corner  
         """  
         debugMsg("Called Box.getBLF()")  
         return self.blf  
   
     def setTRB(self, top, right, back):  
         """  
         Set the position of the top, right, back corner  
         """  
   
     def getTRB(self):  
         """  
         Get the current position of the top, right, back corner  
         """  
         debugMsg("Called Box.getTRB()")  
         return self.trb  
   
   
 class ClipBox(Box):  
     """  
     Clip box class: used to clip data sets with a box  
   
     A box in this sense means three planes at right angles to one another  
     """  
   
     def __init__(self, plot):  
         """  
         Intialisation of the ClipBox object  
         """  
   
     def setInsideOut(self, insideOut):  
         """  
         Set the inside out flag  
         """  
   
     def getInsideOut(self):  
         """  
         Get the current value of the inside out flag  
         """  
   
 class Camera(Item):  
     """  
     Camera class  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the Camera object  
   
         @param scene: The Scene object to add the Camera object to  
         @type scene: Scene object  
         """  
     def setPosition(self, *pos):  
         """  
         Set position of camera within scene  
   
         @param pos: Position to set camera in terms of x,y,z coordinates  
         @type pos: tuple  
         """  
   
     def getPosition(self):  
         """  
         Get the position of Camera within Scene  
   
         Returns the position in a tuple of form (xPos, yPos, zPos)  
         """  
         debugMsg("Called Camera.getPosition()")  
   
         return (self.xPos, self.yPos, self.zPos)  
   
     def setFocalPoint(self, *pos):  
         """  
         Sets the focal point of the Camera with the Scene  
   
         @param pos: Position to set the focal point  
         @type pos: tuple  
         """  
   
     def getFocalPoint(self):  
         """  
         Get the position of the focal point of the Camera  
   
         Returns the position of the focal point in a tuple of form  
         (xPos, yPos, zPos)  
         """  
   
     def setElevation(self, elevation):  
         """  
         Set the elevation angle (in degrees) of the Camera  
   
         @param elevation: The elevation angle (in degrees) of the Camera  
         @type elevation: float  
         """  
   
         return  
   
     def getElevation(self):  
         """  
         Gets the elevation angle (in degrees) of the Camera  
         """  
   
     def setAzimuth(self, azimuth):  
         """  
         Set the azimuthal angle (in degrees) of the Camera  
   
         @param azimuth: The azimuthal angle (in degrees) of the Camera  
         @type azimuth: float  
         """  
   
     def getAzimuth(self):  
         """  
         Get the azimuthal angle (in degrees) of the Camera  
         """  
 class ContourPlot(Plot):  
     """  
     Contour plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the ContourPlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of extra options  
         @type options: dict  
   
         @param fname: the name of the input vtk file  
         @type fname: string  
   
         @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
         @type format: string  
   
         @param scalars: the scalar data in the vtk file to use  
         @type scalars: string  
         """  
   
 class EllipsoidPlot(Plot):  
     """  
     Ellipsoid plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the EllipsoidPlot class  
   
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
         debugMsg("Called EllipsoidPlot.__init__()")  
         Plot.__init__(self, scene)  
   
         self.renderer = scene.renderer  
         self.renderer.addToInitStack("# EllipsoidPlot.__init__()")  
   
         # labels and stuff  
         self.title = None  
         self.xlabel = None  
         self.ylabel = None  
         self.zlabel = None  
           
         # default values for fname, format and tensors  
         self.fname = None  
         self.format = None  
     self.tensors = None  
   
     # default values for shared info  
     self.escriptData = False  
     self.otherData = False  
   
         # add the plot to the scene  
         scene.add(self)  
   
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of keyword options to the method  
         @type options: dict  
   
     @param fname: the name of the input vtk file  
     @type fname: string  
   
     @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
     @type format: string  
   
     @param tensors: the name of the tensor data in the vtk file to use  
     @type tensors: string  
         """  
   
 class Image(Item):  
     """  
     Image class.  Generic class to handle image data.  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the Image class object  
           
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
         debugMsg("Called Image.__init__()")  
         Item.__init__(self)  
3    
4          if scene is not None:  \section{Introduction}
             self.renderer = scene.renderer  
           
     def load(self, fname):  
         """  
         Loads image data from file.  
   
         @param fname: The filename from which to load image data  
         @type fname: string  
         """  
         debugMsg("Called Image.load()")  
   
         fileCheck(fname)  
   
         return  
   
 class JpegImage(Image):  
     """  
     Subclass of Image class to explicitly handle jpeg images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the JpegImage class object  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
   
     def load(self, fname):  
         """  
         Loads jpeg image data from file.  
   
         @param fname: The filename from which to load jpeg image data  
         @type fname: string  
         """  
   
 class PngImage(Image):  
     """  
     Subclass of Image class to explicitly handle png images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the PngImage class object  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
   
     def load(self, fname):  
         """  
         Loads png image data from file.  
   
         @param fname: The filename from which to load png image data  
         @type fname: string  
         """  
 class BmpImage(Image):  
     """  
     Subclass of Image class to explicitly handle bmp images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the BmpImage class object  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
     def load(self, fname):  
         """  
         Loads bmp image data from file.  
   
         @param fname: The filename from which to load bmp image data  
         @type fname: string  
         """  
   
 class TiffImage(Image):  
     """  
     Subclass of Image class to explicitly handle tiff images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the TiffImage class object  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
     def load(self, fname):  
         """  
         Loads tiff image data from file.  
   
         @param fname: The filename from which to load tiff image data  
         @type fname: string  
         """  
 class PnmImage(Image):  
     """  
     Subclass of Image class to explicitly handle pnm (ppm, pgm, pbm) images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the PnmImage class object  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
           
     def load(self, fname):  
         """  
         Loads pnm (ppm, pgm, pbm) image data from file.  
   
         @param fname: The filename from which to load pnm image data  
         @type fname: string  
         """  
   
 class PsImage(Image):  
     """  
     Subclass of Image class to explicitly handle ps images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the PsImage class object  
   
         This object is B{only} used for generating postscript output  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
   
     def load(self, fname):  
         """  
         Loads ps image data from file.  
   
         B{NOT} supported by this renderer module  
   
         @param fname: The filename from which to load ps image data  
         @type fname: string  
         """  
         debugMsg("Called PsImage.load()")  
5    
6          # need to check if the file exists  \pyvisi provides an easy to use interface to the \VTK visualization
7          fileCheck(fname)  tool.  
8    
9          # this ability not handled by this renderer module  \section{Rendering}
10          unsupportedError()  same word on rendering, off-line, on-line, how to rotate, zoom, close the window, ...
11            
12          return  \section{How to Make a Movie}
13    
14    \section{\pyvisi Classes}
15    \declaremodule{extension}{esys.pyvisi}
16    \modulesynopsis{A simple Python visualization interface for \VTK}
17    
18    In this section we give a brief overview over the important classes and their methods. Please
19    check the \ReferenceGuide on details.
20    %=====================================================================================
21    \subsection{Scene Classes}
22    \begin{classdesc}{Scene}{}
23    Displays a scene in which objects are to be rendered on.
24    \end{classdesc}
25    
26    \begin{classdesc}{Camera}{}
27     Controls the camera manipulation.
28    \end{classdesc}
29    
30    \begin{classdesc}{Light}{}
31     Controls the light manipulation.
32    \end{classdesc}
33    
34    %============================================================================================================
35    \subsection{Input Classes}
36    
37    \begin{classdesc}{Image}{}
38     Displays an image.
39    \end{classdesc}
40    
41    \begin{classdesc}{Text}{}
42     Shows some 2D text.
43    \end{classdesc}
44    
45    \begin{classdesc}{DataCollector}{}
46    Deals with the source of data for visualization.
47    \end{classdesc}
48    
49    %============================================================================================================
50    \subsection{Data Visualization}
51    \begin{classdesc}{Map}{}
52     Displays a scalar field using a domain surface.
53    \end{classdesc}
54    
55    \begin{classdesc}{MapOnPlaneCut}{}
56     Displays a scalar field using a domain surface cut on a plane.
57    \end{classdesc}
58    
59    \begin{classdesc}{MapOnPlaneClip}{}
60     Displays a scalar field using a domain surface clipped
61            on a plane.
62    \end{classdesc}
63    
64    \begin{classdesc}{MapOnScalarClip}{}
65     Displays a scalar field using a domain surface clipped
66            using a scalar value.
67    \end{classdesc}
68    
69    \begin{classdesc}{Velocity}{}
70     Displays a vector field using arrows.
71    \end{classdesc}
72    
73    \begin{classdesc}{VelocityOnPlaneCut}{}
74     Displays a vector field using arrows cut on a plane.
75    \end{classdesc}
76    
77    \begin{classdesc}{VelocityOnPlaneClip}{}
78     Displays a vector field using arrows clipped on a
79            plane.
80    \end{classdesc}
81    
82    \begin{classdesc}{Ellipsoid}{}
83     Displays a tensor field using spheres.
84    \end{classdesc}
85    
86    \begin{classdesc}{EllipsoidOnPlaneCut}{}
87     Displays a tensor field using spheres cut on a
88            plane.
89    \end{classdesc}
90    
91    \begin{classdesc}{EllipsoidOnPlaneClip}{}
92     Displays a tensor field using spheres clipped
93            on a plane.
94    \end{classdesc}
95    
96            
97    \begin{classdesc}{Contour}{}
98     Shows a scalar field by contour surfaces.
99    \end{classdesc}
100    
101    \begin{classdesc}{ContourOnPlane}{}
102     Shows a scalar field by contour surfaces on
103    a given plane.
104    \end{classdesc}
105    
106    \begin{classdesc}{ContourOnClip}{}
107     Shows a scalar field by contour surfaces on
108    a given clip.
109    \end{classdesc}
110    
111    \begin{classdesc}{IsoSurface}{}
112     Shows a scalar field for a given value by
113    an isosurface.
114    \end{classdesc}
115    
116    \begin{classdesc}{IsoSurfaceOnPlane}{}
117     Shows a scalar field for a given value by
118    an isosurfaceon a given plane.
119    \end{classdesc}
120    
121    \begin{classdesc}{IsoSurfaceOnClip}{}
122     Shows a scalar field for a given vlaue by
123    an isosurface on a given clip.
124    \end{classdesc}
125    
126    \begin{classdesc}{StreamLines}{}
127     Shows the path of particles in a vector field.
128    \end{classdesc}
129    
130    \begin{classdesc}{Carpet}{}
131     Shows a scalar field as plane deformated along
132    the plane normal.
133    \end{classdesc}
134    
135    \section{Geometry}
136    \begin{classdesc}{Position}{}
137     Defines the x,y and z coordinates rendered object.
138    \end{classdesc}
139    
140    \begin{classdesc}{Transform}{}
141    Defines the orientation of rendered object.
142    \end{classdesc}
143    
144    \begin{classdesc}{Plane}{}
145    Defines the cutting/clipping of rendered objects.
146    \end{classdesc}
147    
148    
149    \subsection{Beautification}
150    \begin{classdesc}{Style}{}
151    Defines the style of text.
152    \end{classdesc}
153    
154    \begin{classdesc}{BlueToRed}{}
155     Defines a map spectrum from blue to red.
156    \end{classdesc}
157    
158    \begin{classdesc}{RedToBlue}{}
159     Defines a map spectrum from red to blue.
160    \end{classdesc}
161    
     def render(self):  
         """  
         Does PsImage object specific (pre)rendering stuff  
         """  
         debugMsg("Called PsImage.render()")  
   
         return  
   
 class PdfImage(Image):  
     """  
     Subclass of Image class to explicitly handle pdf images  
     """  
     def __init__(self, scene=None):  
         """  
         Initialises the PdfImage class object  
   
         This object is B{only} used for generating pdf output  
   
         @param scene: The Scene object to add to  
         @type scene: Scene object  
         """  
   
     def load(self, fname):  
         """  
         Loads pdf image data from file.  
   
         B{NOT} supported by this renderer module  
   
         @param fname: The filename from which to load pdf image data  
         @type fname: string  
         """  
   
 class IsosurfacePlot(Plot):  
     """  
     Isosurface plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the IsosurfacePlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of keyword options to the method  
         @type options: dict  
   
     @param fname: the name of the input vtk file  
     @type fname: string  
   
     @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
     @type format: string  
   
     @param scalars: the name of the scalar data in the vtk file to use  
     @type scalars: string  
         """  
   
 class LinePlot(Plot):  
     """  
     Line plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the LinePlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
   
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
     @param options: Dictionary of extra options  
     @type options: dict  
   
     @param offset: whether or not to offset the lines from one another  
     @type offset: boolean  
   
     @param fname: Filename of the input vtk file  
     @type fname: string  
   
     @param format: format of the input vtk file ('vtk' or 'vtk-xml')  
     @type format: string  
   
     @param scalars: the name of the scalar data in the vtk file to use  
     @type scalars: string  
         """  
   
 class OffsetPlot(Plot):  
     """  
     Offset plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the OffsetPlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
   
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of extra options  
         @type options: dict  
   
     @param fname: Filename of the input vtk file  
     @type fname: string  
   
     @param format: Format of the input vtk file ('vtk' or 'vtk-xml')  
     @type format: string  
   
     @param scalars: the name of the scalar data in the vtk file to use  
     @type scalars: string  
         """  
 class Plane(Item):  
     """  
     Generic class for Plane objects  
     """  
   
     def __init__(self, scene):  
         """  
         Initialisation of the Plane object  
         """  
   
     def setOrigin(self, x, y, z):  
         """  
         Set the origin of the plane  
         """  
   
     def getOrigin(self):  
         """  
         Get the current origin of the plane  
         """  
   
     def setNormal(self, vx, vy, vz):  
         """  
         Set the normal vector to the plane  
         """  
   
     def getNormal(self):  
         """  
         Get the current normal vector to the plane  
         """  
   
     def mapImageToPlane(self, image):  
         # this really needs to go somewhere else!!!  
         """  
         Maps an Image object onto a Plane object  
         """  
   
 class CutPlane(Plane):  
     """  
     Cut plane class: used to cut data sets with a plane  
   
     Cut plane objects define a plane to cut a data set or plot by and return  
     the data along the intersection between the data set or plot with the  
     defined plane.  
     """  
   
     def __init__(self):  
         """  
         Intialisation of the CutPlane object  
         """  
   
   
 class ClipPlane(Plane):  
     """  
     Class for planes used to clip datasets  
     """  
   
     def __init__(self):  
         """  
         Intialisation of the ClipPlane object  
         """  
   
     def setInsideOut(self, insideOut):  
         """  
         Set the inside out flag  
         """  
   
     def getInsideOut(self):  
         """  
         Get the current value of the inside out flag  
         """  
   
 class Plot(Item):  
     """  
     Abstract plot class  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the abstract Plot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
   
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
     @param options: Dictionary of extra options  
     @type options: dict  
         """  
   
     def setTitle(self, title):  
         """  
         Set the plot title  
   
         @param title: the string holding the title to the plot  
         @type title: string  
         """  
         debugMsg("Called setTitle() in Plot()")  
   
   
     def setXLabel(self, label):  
         """  
         Set the label of the x-axis  
   
         @param label: the string holding the label of the x-axis  
         @type label: string  
         """  
   
     def setYLabel(self, label):  
         """  
         Set the label of the y-axis  
   
         @param label: the string holding the label of the y-axis  
         @type label: string  
         """  
   
     def setZLabel(self, label):  
         """  
         Set the label of the z-axis  
   
         @param label: the string holding the label of the z-axis  
         @type label: string  
         """  
   
     def setLabel(self, axis, label):  
         """  
         Set the label of a given axis  
   
         @param axis: string (Axis object maybe??) of the axis (e.g. x, y, z)  
         @type axis: string or Axis object  
   
         @param label: string of the label to set for the axis  
         @type label: string  
         """  
   
 class Renderer(BaseRenderer):  
     """  
     A generic object holding a renderer of a Scene().  
     """  
   
     def __init__(self):  
         """  
         Initialisation of Renderer() class  
         """  
         debugMsg("Called Renderer.__init__()")  
         BaseRenderer.__init__(self)  
   
         # initialise some attributes  
         self.renderWindowWidth = 640  
         self.renderWindowHeight = 480  
   
         # what is the name of my renderer?  
         self.name = _rendererName  
   
         # the namespace to run the exec code  
         self.renderDict = {}  
   
         # initialise the evalstack  
         self._evalStack = ""  
   
         # keep the initial setup of the module for later reuse  
         self._initStack = ""  
   
         # initialise the renderer module  
         self.runString("# Renderer._initRendererModule")  
         self.addToInitStack("import vtk")  
         self.addToInitStack("from numarray import *")  
   
 __revision__ = '$Revision: 1.33 $'  
   
 class Scene(BaseScene):  
     """  
     The main object controlling the scene.  
       
     Scene object methods and classes overriding the BaseScene class.  
     """  
   
     def __init__(self):  
         """  
         The init function  
         """  
   
     def add(self, obj):  
         """  
         Add a new item to the scene  
   
         @param obj: The object to add to the scene  
         @type obj: object  
         """  
   
     def place(self, obj):  
         """  
         Place an object within a scene  
   
         @param obj: The object to place within the scene  
         @type obj: object  
         """  
   
     def render(self, pause=False, interactive=False):  
         """  
         Render (or re-render) the scene  
           
         Render the scene, either to screen, or to a buffer waiting for a save  
   
         @param pause: Flag to wait at end of script evaluation for user input  
         @type pause: boolean  
162    
         @param interactive: Whether or not to have interactive use of the output  
         @type interactive: boolean  
         """  
   
     def save(self, fname, format):  
         """  
         Save the scene to a file  
   
         Possible formats are:  
             - Postscript  
             - PNG  
             - JPEG  
             - TIFF  
             - BMP  
             - PNM  
   
         @param fname: Name of output file  
         @type fname: string  
   
         @param format: Graphics format of output file  
         @type format: Image object or string  
         """  
   
     def setBackgroundColor(self, *color):  
         """  
         Sets the background color of the Scene  
   
         @param color: The color to set the background to.  Can be RGB or CMYK  
         @type color: tuple  
         """  
   
     def getBackgroundColor(self):  
         """  
         Gets the current background color setting of the Scene  
         """  
   
     def setSize(self, xSize, ySize):  
         """  
         Sets the size of the scene.  
   
         This size is effectively the renderer window size.  
   
         @param xSize: the size to set the x dimension  
         @type xSize: float  
   
         @param ySize: the size to set the y dimension  
         @type ySize: float  
         """  
   
     def getSize(self):  
         """  
         Gets the current size of the scene  
   
         This size is effectively the renderer window size.  Returns a tuple  
         of the x and y dimensions respectively, in pixel units(??).  
         """  
 class SurfacePlot(Plot):  
     """  
     Surface plot  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the SurfacePlot class  
           
         @param scene: The Scene to render the plot in  
         @type scene: Scene object  
         """  
   
     def setData(self, *dataList, **options):  
         """  
         Set data to the plot  
   
         @param dataList: List of data to set to the plot  
         @type dataList: tuple  
   
         @param options: Dictionary of extra options  
         @type options: dict  
   
         @param fname: the name of the input vtk file  
         @type fname: string  
   
         @param format: the format of the input vtk file ('vtk' or 'vtk-xml')  
         @type format: string  
   
         @param scalars: the scalar data in the vtk file to use  
         @type scalars: string  
         """  
   
 class Text(Item):  
     """  
     Text  
     """  
     def __init__(self, scene):  
         """  
         Initialisation of the Text object  
   
         @param scene: the scene with which to associate the Text object  
         @type scene: Scene object  
         """  
   
     def setFont(self, font):  
         """  
         Set the current font  
   
         @param font: the font to set  
         @type font: string  
         """  
   
     def getFont(self):  
         """  
 \end{verbose}  
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