The StickWindow is designed for displaying forceplate vectors and marker trajectories as stick figures using APAS .3D files as data source. The to types of data can be displayed together or separate. The loading of marker trajectory and forceplate vectors is only possible with APAS .3D and APAS .ANA files.
The following types of data can be loaded:
1. APAS .3D files (Marker trajectory/Stickfigures)
2. Forceplate data (Only APAS analog files .ANA)
Opening a StickWindow
To open a new instance of the StickWindow you can use the two following options:
1. The New StickWindow in the file menu
2. The speedbutton in the APASview speed bar panel.
As default the name/title of the StickWindow will be the filename. To change this double click on the grey speedbar panel, next to the speedbuttons. The name can only be changed if data is loaded.
Markers and their connections.
Co-ordinates from film data are normally used to link human joints together in segments. When loading APAS .3D datafiles the position of the markers are loaded into APASview. From the APAS .CF configuration file APASview extract information on how the marker data are supposed to be displayed. Editing the configuration of the display of marker data can be performed in the StickWindow set-up or directly in StickWindow.
With Marker Size it is possible to select the size of the markers displayed in the window (Min. size is 1 and Max. is 10).
Displaying markers on the canvas
It is possible to disable and enable the display of the markers individually. Using the button Display All causes the display of all the markers to be enabled or disabled.
How is a segment defined ?
One segments is defined as a connection from one marker to another. If you have the ankle connected to the knee you have created the calf. Creating a new segment requires 3 steps:
1. Select a marker from the marker list (when selecting a marker from the Marker List, the corresponding marker connection will be shown in the box below the Marker List).
2. Select the marker to be connected to from the Marker Selection table (This list shows all the markers in the APAS .3d file)
3. After selecting a marker to connect to, you must push the button , indicating a add for the connection list.
Deleting a segment
1. Select a marker from the marker list (when selecting a marker from the Marker List, the corresponding Maker connection will be shown in the box below the Marker List).
2. Select a marker from the Marker Connection table just below the Marker List menu.
3. Push the Del. button and the Marker Connection is removed.
When evaluating motion with numerical data such as EMG, force, or velocity it can be difficult to find a relation ship. Coloring the segments and numericaldata makes this a lot easier.
Defining a colour for a specific segment can be obtained in 4 steps:
1. Select a Marker from the Marker List
2. Select a Connected Marker which creates the segment.
3. Click on the color button
4. Select the color
These two parameters are used to synchronise either the StickWindow with respect to other windows or to synchronise the forceplate data together with the stickfigure data.
Example to synchronise StickWindow with other windows:
1 2 3 4 5 6
1 2 3 4 5 6
In this situation the data is aligned in time, which is important for the APASview to display correct. But in window1 the first sample has to be aligned together with window2 sample number 2. This is accomplished by setting the Window sync to 1.
Example to synchronise Stickfigure data with forceplate data:
1 2 3 4 5 6
1 2 3 4 5 6
Normally the forceplate data is sampled with a much higher frequency than marker trajectory data. This problem is taken care of in the APASview, by averaging the forceplate data to fit the marker trajectory data (Stickfigure). If for example the forceplate is sampled with 1000Hz and the marker trajectory with 50Hz, the forceplate data will be reduce with a factor of 20. In some cases it is useful to be able to synchronise the forceplate data together with the marker trajectory. In the above example the Forceplate sync should be set to 3 if the data sample number 4 in the forceplate data has to be aligned together with the first sample in the marker trajectory (stickfigure).
Creating and deleting stickfigure segments.
All though it is possible to create segments in the StickWindow setup it is also possible to create segments directly in the StickWindow.
Move the mouse to the marker from where the segment has to have it's origin. Hold down the right mouse button and move the mouse to the marker where the segment must attach. Release the mouse button and the segment is created.
Deleting a marker is a bit more difficult than creating. Move to the marker where the segment has it's origin. Click the right mouse button. This will bring up a window for a marker configuration. In the Marker configuration it is possible to change the setup of the stickfigure including deleting of segmets.
This option is used to set the marker color. This can be useful if the marker must be traced through the sequence.
This parameter is used to set the size of all the makers in the stickfigure.
This option will make the marker visible or not visible.
The name of the marker, can be modified.
This list is used for displaying the markers that creates segment. To add a connection choose a marker from the Marker Selection table and press the button. Deleting a connection, select a marker from the Marker Connection list and press the button.
Select a marker from the Marker Connection list, click on Segment Color panel. Use the Color dialog to modify the segment color.
After the stickfigure is loaded it is possible to zoom the stick figure. Point the mouse on the canvas of the StickWindow. Holding down the left mouse button and moving the mouse up and down activate the zoom.
Rotating the stickfigure.
Rotation is possible with both two and three dimensional stick figures. Point the mouse on the canvas of the StickWindow. Hold down the shift button on the keyboard and the left mouse button, drag the mouse up and down for tilting and sideways for panning.
If the StickWindow is loaded with forceplate data/forcevectors the length of the force vector is accomplished holding the keyboard Ctrl button and moving the mouse up and down. 100% forcevector length is calculated to be the maximum height of the loaded stick diagram. The force vector can be scaled between 1 and 200%.
The StickWindow is provided with speedbuttons to speedup the usability and to add special features such as printing, copy to the clipboard and other useful stuff.
Ground reaction force vector zooming/scaling.
If the StickWindow is loaded with ground reaction data/forcevectors the length of the force vector is accomplished holding the keyboard shift button and moving the mouse up and down. 100% forcevector length is calculated to be the maximum height of the loaded stick diagram. The force vector can be scaled between 1 and 200%.
This function is used to trace one or more markers through the sequence. Use the option none in the Marker tracing setup if tracing is not wanted.
Use this speedbutton to evoke the tracemarker setup window.
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