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| <title>Concepts</title> |
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| <h3> |
| 2. Concepts |
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| 2.1. Overview |
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| <p> |
| As described in the class diagram below, a complete XY Graph is composed of Legend, |
| Title, Axes, PlotArea. The PlotArea will include Traces, Grids and Annotations. |
| An XYGraph can also be wrapped into a ToolbarArmedXYGraph, which provides a toolbar |
| for the interactive operations functionality. |
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| <p> |
| <img src = "img/XYGraphUML.png" alt = "XYGraph Class Diagram" border="1"/> |
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| There are two interfaces <code>IDataProvider</code> and <code>ISample</code> in the class diagram, |
| which means the user can also implemented there own data provider or sample. |
| This gives the possibilities to implement a different data provider |
| with different data source or data storage structure for special applications, |
| For example, the data source in the data provider could be from user input, database or files etc,. |
| The storage structure could be array, queue, circular buffer or bucket buffer etc,. |
| A default data provider <code>CircularBufferDataProvider</code> and sample <code>Sample</code> |
| have been provided with the XYGraph plugin. |
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