Purpose

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The XY Plot Application (hereafter called XY Plot) creates and manages the definitions of XY windows, which are graphic windows in which curves are plotted. XY Plot also creates and manages the definitions of curves and titles, and manages the display of XY plot information. Task Structure, 4 gives a correlation of the basic tasks described below with the forms used to carry out those tasks. See Description of XY Window Display Components, 5 for a description of the various display elements that appear in an XY window.

Management of XY Window Definitions	XY Plot manages the following XY window elements: • Window name. • Display, label, and scale specifications for the axes that appear in the graph area. • Display specifications for axis tick marks and plot gridlines. • Display specifications for a legend box that appears outside the graph area.
Management of Curve Definitions	Each curve definition includes the following elements: • Curve data; consisting of a curve name, title, data type identifier, and set of data points to be plotted. • Curve display and plot specifications. Curve data can also be exported to a new or existing curve data file, which are external files stored in directories. See How Curves are Created, 12 for a description of the ways in which new curves are created.
Management of Title Definitions	Each Title definition includes the title name, the title text, and the display specifications.
Management of XY Window Displays	Selected XY windows are posted for display on the screen. Any XY window can be selected as the current XY window. Curve(s) and title(s) are posted for display in the current XY window. The current XY window is the only XY window whose graph area, legend, axes, tick marks, and gridline display options can be modified.

Management of XY Window Definitions

XY Plot manages the following XY window elements:

• Window name.

• Display, label, and scale specifications for the axes that appear in the graph area.

• Display specifications for axis tick marks and plot gridlines.

• Display specifications for a legend box that appears outside the graph area.

Management of Curve Definitions

Each curve definition includes the following elements:

• Curve data; consisting of a curve name, title, data type identifier, and set of data points to be plotted.

• Curve display and plot specifications.

Curve data can also be exported to a new or existing curve data file, which are external files stored in directories.

See How Curves are Created, 12 for a description of the ways in which new curves are created.

Management of Title Definitions

Each Title definition includes the title name, the title text, and the display specifications.

Management of XY Window Displays

Selected XY windows are posted for display on the screen. Any XY window can be selected as the current XY window. Curve(s) and title(s) are posted for display in the current XY window. The current XY window is the only XY window whose graph area, legend, axes, tick marks, and gridline display options can be modified.