VolViewer scripting and accessing VolViewer from Matlab

VolViewer scripting

A script is a limited form of program - a list of commands. In this case the commands (http://dmbi.nbi.bbsrc.ac.uk/index.php/VolViewerScriptsAPI see VolViewerScriptsAPI]) cover most of the operations that you would usually do interactively. On Windows, VolViewer is an exe file that can either be
interactive, i.e. launched by clicking its icon or from the command prompt using the command

VolViewer.exe

or scripted. In which case the operations (commands) are stored in a script file. In which case VolViewer is launched with

VolViewer set_watchfile('file.txt')

where file.txt contains the commands. For example, if VolViewer is to be a viewing tool for an external program, e.g. a Matlab program, then the file.txt could contain

open_image_stack(0, 'E:\VOLUME DATA\ScanID1934_Leaf1\')

where ScanID1934_Leaf1 is a directory containing a stack of images. VolViewer will automatically load and display these images as soon as it finds that the watchfile has been updated.

Other examples

It is not practical to script VolViewer using these commands manually. It is better to use VolViewer as a tool that is controlled through a library of commands in, for example, Matlab. Or, when running VolViewer on the server side of a server/client session where the user is interacting with VolViewer through a client web page.

Matlab to Volviewer

The DArT_Toolbox contains a library of functions for using and controlling VolViewer from Matlab.

Accessing VolViewer from Matlab

There is a VolViewer Matlab class library: launching and controlling Volviewer for the display of 3D volume images (the display window has zoom, rotate, etc.). On computers with an appropriate graphics card and stereo display VolViewer can be used to display volume images and graphics objects from msr files.

VolViewer viewport without its usual menu-bars and under control of a Matlab program. It shows endogenous fluorescence signal from a young leaf that has been annotated with a series of points set on the mid point of trichomes and joined by lines. These points characterise the 3D shape of the leaf and are stored in an MSR text file.
To manipulate the view: left-click-drag rotate, middle-click-drag translate, right-click-drag zoom.

This image was created using steps 2, 3, and 4 below.

1) Install VolViewer

For example, in 'C:\VolViewer_x64'. This is the PathToVolViewer.

2) Launch VolViewer from Matlab

Temporary data files on paths are saved in '...\DArT_Toolshed\ToolBag\VolViewerAPI\CLASSFILES'

This should mean that once VolViewer is installed on a computer - the system will remember where to find everything without having to respecify paths.

 VO=VolViewer(1,'D:\VolViewer_x64','D:\VolViewer_x64')

creates a VolViewer object - which, because there is no semicolon at the end, is displayed as:

         PathToVolViewer: D:\VolViewer_x64 
         PathToWatchFile: D:\VolViewer_x64 
         WatchFileNumber:    1.00000 
                     PathTo: 
          imageFilenames: 
             msrFilename: 
             tfnFilename: 
             slcFilename: 
             vvrFilename: 
             objFilename: 
                Commands:

Notice that the paths have been filled in and that this is the first copy of VolViewer (WatchFileNumber is 1).
3) Display an image stack in VolViewer

The key step is to notify VolViewer where to find the images by putting a command into WatchFile1.txt. This is done automatically with the following

 VO=imshowVOL(VO, 'PathTo','D:\Shape_T1_only\Image_data\11to14DFS\1554')

In this case the image stack is in the directory 'D:\Shape_T1_only\Image_data\11to14DFS\1554'. Notice, that VOL has been updated

>> VOL
         PathToVolViewer: D:\VolViewer_x64 
         PathToWatchFile: D:\VolViewer_x64 
         WatchFileNumber:    1.00000 
         PathTo: D:\Shape_T1_only\Image_data\11to14DFS\1554 
          imageFilenames: 
             msrFilename: 
             tfnFilename: 
             slcFilename: 
             vvrFilename: 
             objFilename: 
                Commands:

4) Display an MSR (results: points/lines/planes) file

Put the command into WatchFile1.txt using

 VO=imshowVOL(VO,'PathTo','D:\Shape_T1_only\Image_data\11to14DFS\1554','msrFilename','1554_T1_Shape.msr')

To hide the image

VO=commandsVOL(VO,'set_channels(0,0,0)');

To see the image again

VO=commandsVOL(VO,'set_channels(1,1,1)');

To clear the MSR points/lines/planes

VO=commandsVOL(VO,'set_clear_all_MSR()')

VolViewer Scripting in more detail

Contents

See also

VolViewer scripting and accessing VolViewer from Matlab