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Configuring Trend Charts

To configure a trend chart initially, you need only to provide an expression to plot.

Creating a Trend Chart

To create a trend chart:

A trend chart appears upon the workspace. Click on the trend chart to display its menu. Choose table to display the attribute table of the trend chart. The next diagram shows a new trend chart, the trend chart menu, and the trend chart attribute table.


By default, a new trend chart contains the minimal set of useful components - a single value axis, ranging from -1.0 to 1.0 and a time axis. One plot is defined, but needs an expression before the trend chart can plot any data. If you start your KB with a new trend chart you have not customized, the chart will scroll as time progresses, but no data will be displayed because the plot has no expression.

Sizing a Trend Chart

G2 limits the size of a trend chart so that it cannot become so large that it consumes all available system resources.

To change the size of a trend chart:

G2 draws a size box around the trend chart and displays update dialog, shown here. Move the edges of the size box so that the trend chart is the size you want and click Update Now in the dialog.


Summarizing Trend Chart Attributes

Configuring a trend chart requires editing one or more of the compound attributes. The trend chart attributes are:

Attribute Description
Title
An optional label that is displayed on the top of the trend chart.
Allowable values:
Any symbol
Default value:
blank


Plots
Summarizes the number of plots that the trend chart is plotting. In text format, provides a complete annotational description of all non-default plot attributes, including the value axis name or number, point and connector format name or number, and the expression of each plot.
Allowable values:
See Configuring Plots.
Default value:
1 plot


Value-axes
Summarizes the number of value axes that the trend chart uses. In text format, provides an annotational description of each value axis and any non-default values.
Allowable values:
See Configuring Value Axes.
Default value:
1 value-axis


Time-axes
Summarizes the time axis indicator. In text format, supplies an annotational description of each of the time axis attributes and any non-default values.
Allowable values:
See Configuring the Time Axis.
Default value:
a time-axis


Point-formats
Summarizes the total number of point formats that the trend chart uses. In text format, supplies an annotational description of each point format and any non-default values.
Allowable values:
See Configuring Point Formats.
Default value:
1 point-format


Connector-formats
Summarizes the total number of connector formats that the trend chart uses. In text format, supplies an annotational description of each connector format and any non-default values.
Allowable values:
See Configuring Connector Formats.
Default value:
1 connector-format


Trend-chart-format
Summarizes the trend chart format indicator. In text format, supplies an annotational description of each of the trend chart format attributes containing non-default values.
Allowable values:
See Configuring the Trend Chart Format.
Default value:
a trend-chart-format

The following sections describe how to customize each trend chart component.

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