The Expression Selector Java applet allows the user to select subexpressions of mathematical equations.
This is accomplished by using the techexplorer MouseEvent
and the Document Object Model (DOM)
API. The MouseEvent provide two methods (
getNodePathList,
getNodeSelectionList) for accessing Nodes that are triggered by
a particular event.
The Expression Selector handles techexplorer generated mouseMoved and
mouseRelease events. It is in the mouseMoved and
mouseRelease methods where the current selection (Selection Path), the currently
clicked on node (Node Path) and the current node under the cursor (Motion Path) is determined.
Try out the Expression Selector below!
You can even input a new equation by typing in the LaTeX source in the field provided
above. For example, in the Input window, type a math expression like
$\frac{a}{b} = 0$. Then click on Latex Input to see the formula displayed.
The Expression Selector applet uses the
createFromTexString method
defined in
TEDocument
to obtain a DOM fragment from the input source. This
fragment is then inserted into the document tree.
IBM techexplorer Hypermedia Browser is a trademark of the IBM Corporation. Send comments and questions to techexpl@us.ibm.com.