Chart Options for Trends

When a color is chosen, the plot area will alternate between this color and the plot area color. The alternations will happen between major x-axis grid lines. Learn more

Enables and configures the chart and pen context menus. Learn more

Sets how uncertain quality samples are handled. The options are:

• Leave gap - The line will end before the uncertain sample and resume at the next non-uncertain sample.

• Plot - The uncertain sample will be plotted like good quality samples.

• Span over - The samples before and after the uncertain samples will be connected as if the uncertain samples between them did not exist.

Same as uncertain quality plot mode, but for bad quality samples.

The maximum amount of samples that can be buffered per pen in this chart. This limit prevents a pen with too many samples from using too much memory.

When checked, disabled pens are shown in the legend. When unchecked, they are hidden completely. (Disabled pens are never shown in the chart.)

When checked, pens with an invalid data source are shown in the legend and chart. When unchecked, they are hidden completely.

The settings in this section set the properties for a pen added in runtime, such as via drag-and-drop or the add pen command. Learn more

If enabled, the viewer will not allow the same data source to be added as a pen more than once.

This setting determines how the data is sampled and how often a sample is drawn on the viewer for each pen. The options are:

• Interval - Samples will be collected at the given interval. This is recommended for viewers where the operator will not be zooming or changing the range. Expanding the range in runtime while using interval could result in an unexpectedly large number of samples and decreased performance.

• Count - The sampling rate will be automatically determined from the range to ensure this number of samples per pen. For example, if your range is 1 hour and the count is 60, historical data will be sampled at a rate of 1 minute.

• Auto - This is used with the automatic time alignment setting on the X Axis tab. It will automatically pick a sample rate to match the major tick marks configured in the time alignment. The maximum sampling interval is for this option is 1 hour.

For best performance, if you expect your operators to be zooming or changing the range, choose count. This will ensure consistent memory usage no matter the zoom level or range. A sampling method of interval can cause a decrease in performance if the viewer is zoomed out or the range is expanded significantly.

Different pen types use the sampling interval differently as described below:

• Real-time pens - As a data collection rate
• Historical aggregated pens - The historical sampling interval
• Historical raw pens - Not used

When enabled, allows you to use an expression to customize your date and time format. Use the {{@@timestamp}} placeholder to represent the time being formatted.

The default expression is: x=tostring({{@@timestamp}})

This format applies to the legend and tooltip.

When checked, timestamps are displayed in UTC. When unchecked, timestamps are displayed in the client's local time zone.

The period of time covered by the chart, ending with the current time.

The speed at which the viewer is animated when not in freeze mode.

The faster the animation speed, the more resources will be required.

The rate at which historical reads are made. If Optimize History Read rate is enabled, this becomes the minimum allowed history refresh rate.

This rate should not be faster than the sampling interval on the Data tab for aggregated historical data, or the data collection rate configured in the historian for raw historical data.

This does not affect real-time data sources.

When checked, the viewer will automatically choose an optimal history read rate, based on the sampling interval.

We recommend leaving this enabled for best performance.

When checked, the viewer will read the value in data source and change the chart range to match. This only applies when the viewer is in freeze mode.

When checked, the viewer will write its range to the data source point whenever the range is updated.

When checked, the time labels on the x-axis will be automatically aligned with even or rounded timestamps. The exact timestamps will be determined from the viewer's range. For example, if your range is 5 hours, the times on the axis will be exact hours, such as 8:00:00 AM, 9:00:00 AM, etc.

To adjust the time alignment settings manually, disable Automatic Time Alignment and enable Time Alignment.

When enabled, allows you to use an expression to customize your date and time format. Use the {{@@timestamp}} placeholder to represent the time being formatted.

The default expression is: x=tostring({{@@timestamp}})

When enabled, all pens in the chart can share y-axes. These shared axes can be configured using the Configure button. Learn more

When disabled, each pen will have its own y-axis.

When enabled, the user can change what range is displayed next to the chart in runtime by selecting a pen in the legend.

This option is only available if shared value axis is disabled.

Sets how the y-axes are resorted when a pen is selected, based on these options:

• Shift - The relative order of the axes is preserved, but they are rotated or shifted so the selected pen is closest to the chart.
• Stack - The axis of the selected pen is taken out of the existing order and moved closest to the chart.

This option is only available if shared value axis is disabled.

When enabled, the cursor will follow the mouse cursor when it is moved over the chart.

This setting cannot be used when the second cursor is enabled.

Enabling this setting disables the ability to zoom using the mouse.

Determines which sample is selected by the cursor. It can have one of these values:

• Previous sample - The closest sample to the cursor in the past.

• Closest sample - The closest sample to the cursor in either direction.

• Next sample - The closest sample to the cursor in the future.

• Interpolate - Interpolate the value and time from the samples on both sides of the cursor.

The data source used for reading and writing for the first cursor.

This field is only enabled if either read cursor position or write cursor position are enabled.

The data source used for reading and writing for the second cursor.

This field is only enabled if second cursor and either read cursor position or write cursor position are enabled.

When enabled, the cursor tooltip's visibility is read from the data source when the data source is updated.

When enabled, the cursor tooltip's visibility is written to the data source when the visibility changes.

The color to use when shading the area between the cursors in summary view.

In GraphWorX64 runtime, this color is used to shade the area outside the cursors.

When in snap mode, summary view behaves as follows:

• Cursors cannot be freely moved but instead snap to the nearest axis tick mark.

• The time range cannot be changed - the cursors cannot be moved further or closer to each other.

• The selected area can be moved with a single mouse click.