frameChart.java is a stand alone application designed to run on any machine which supports java 1.1.x.  frameChart.java takes the data and the type of the Chart to be drawn for that data from the user. It prepares a TChart which contains a TData and other relevant information to draw the chart. Then the class sends the TChart to the relative frame Wizard. 
frameChart extends from Frame. If frameChart is compiled the compiler produces frameChart.class which is a stand alone Java application. 

TData.java  is a data manager which is responsible from maintenance of the numeric data for a Chart. All the TChart classes (TBarChart, TPieChart...) contains one TData to keep its numeric data. TData keeps and masters a 2-Dimensional array of floats for the data. It keeps track of the Dimensions of the data (how many rows/columns) and the names of its columns and rows.   

TChart.java is also a data manager which keeps the data (in a TData) and the attributes (name, type, grid lines...) of the chart. Since TChart is a Panel which has graphics on it, TChart extends from Panel. There are 5 Chart Types in DataPlot. 

TXXXChart.java classes extend from TChart. They maintain information about their related chart type. All TChart descendants has the ability to draw themselves. (See the list below.) 
  
frameWizard.java takes the related information for the Chart Type which is to be drawn. frameWizard only asks for the common attributes for charts. frameWizard forms a TChart with this information and sends it to frameDraw which is the Frame on which the Charts are drawn. frameWizard class has 5 descendants one for each type of chart.  frameWizard is never executed directly, instead its descendants are called. 

frXXXWizard.java classes extend from frameWizard. frXXXWizards ask the user for attributes about their related chart. (See the list below.) 
 

TData

Frame 
   | 
   +---frameChart 
   +---frameDraw 
   +---frameWizard 
       | 
       +---frPieWizard 
       +---frLineWizard 
       +---frXYPlotWizard 
       +---frBarWizard 
       +---frColumnWizard 

Related classes 
Related  
    frameWizards