MathBeans

Welcome to the MathBeans package

• CalcField - a TextField with embedded mathematical engine
CalcField (Calculator enabled field bean) is a text field in which the user can enter any constant mathematical expression and press Enter. The expression gets computed and the result is displayed in the same field. The user can set parameters that control the format of the output. The field has an optional cyclic history buffer controlled by up/down keys.

• CalcPanel - a Panel with embedded mathematical engine
CalcPanel (Calculator panel bean) provides the following functionality: based solely on a string representing a mathematical expression with any number of variables, it automatically constructs and displays a mini-calculator panel for this expression. The panel will have input fields for all variables in the expression, each with the label representing its name, and a similar field and label for result. The user enters any numbers into the input fields and presses Enter in any of these fields. The result is immediately computed and displayed in the result field. The user can set parameters that control the format of the output. If desired, the appearance of the panel can be further customized.

 This bean provides a unique possibility of creating various calculators, static or dynamic, avoiding the hassle of setting up GUI, adding logic, dispatching events, etc. The user's only input is the formula itself, all the rest is figured out by the bean.

A simple example. Your code:

numobj.mathbeans.CalcPanel panel = new numobj.mathbeans.CalcPanel ();
panel.setFormula ("Total amount:=Quantity*Item_price*(1+Tax_rate/100)+Shipping");

You get:



As soon as one enters values in the first four fields and presses Enter, the field "Total amount" will display the computed value. 
   

• CalcGraphPanel - a Panel with embedded mathematical engine and graphing capabilities
CalcGraphPanel (Calculator graph panel bean) is an extension of the CalcPanel. Based solely on a string representing a mathematical expression with any number of variables, it automatically constructs and displays a mini-calculator and graph panel for this expression. The mini-calculator panel is a CalcPanel bean (see above).  The graph panel lets the user plot the result as a function of any of its variables and print the graph. Again, the user's only input is the formula itself, all the rest is figured out by the bean.

Your code:

numobj.mathbeans.CalcGraphPanel panel = new numobj.mathbeans.CalcGraphPanel ();
panel.setFormula ("Total amount:=Quantity*Item_price*(1+Tax_rate/100)+Shipping");

You get:



To plot the graph, press the Plot button. On the calculator panel, the field corresponding to the chosen independent variable may contain anything as well as be blank. The fields for the other variables must contain values.

The graph panel is initially blank. After the graph is plotted it would display also the X and Y axes if they fall within the graph range, and marks for measurements in the X and Y directions. After the graph is plotted, the Print button gets enabled, and the graph can be printed. 

The panel is dynamically resizable with the automatic adjustment of the graph. It can also be rolled up to a usual CalcPanel and extended to its full form by pressing a single (+/-) button.

 

Supported formulae

For more information, visit the Numerical Objects home page

Numerical Objects 777-102 San Antonio Road Palo Alto, CA 94303 Phone: (650) 843-0737 FAX: (650) 843-0712 E-mail: numobj@quite.net Web: http://www.quite.net/~numobj