Skip to main content
Version: 7.9

Easy Chart

Component Palette Icon:


This component is used to make powerful and runtime-configurable time-series charts. It is configured by defining a set of pens and axes. Each pen represents a series of data. Pens can be many different styles, such as line, area, bar, and shape. This chart automatically creates controls for picking the time range and for hiding or displaying pens.


  • Easy configuration
  • User-selectable set of pens
  • Automatic time-selection controls
  • SQL Query and/or SQLTags Historian data sources
  • Automatic SPC and calculated pen support
  • Zoom, Pan, X-Trace modes
  • Any number of Y-axes and subplots
  • Realtime or Historical


There are three kinds of pens in the Easy Chart:

  1. Tag Historian Pens. These pens pull their data from the Historian system.
  2. Database Pens. These pens will automatically create SQL SELECT queries to pull data from a database table. Typically, this is a table that is the target of a Historical Transaction Group.
  3. Calculated Pens. These pens display a calculated dataset based off another pen, such as a moving average or an SPC function such as the UCL (Upper Control Limit).

Modes: Realtime vs Historical

The Easy Chart can operate in 3 different modes. These modes affect the range of data that is displayed, the controls the user is shown, and whether or not the chart polls for data.

  1. Historical Mode. In this mode, the user is shown a Date Range component to pick the range of data to fetch and display. The initial values of this component are set through properties on the chart. In historical mode, the chart does not poll.
  2. Realtime Mode. In this mode, the user is given the opportunity to pick the amount of time in the past to display. For example, the last 5 minutes or the last 2 hours. The chart will poll at a rate according to the Poll Rate parameter.
  3. Manual Mode. In this mode, the chart will use the values if its Start Date and End Date parameters to govern what data is displayed. Polling is controlled by having the Poll Rate at zero (polling off) or greater than zero.

Basic Chart Configuration

The Easy Chart has many properties, like other components, that control its behavior. Things like its Mode, Polling Rate, etc are configured via the properties. All of the setup for adding pens, axes, subplots, etc is its Customizer. You can also drag and drop Historian-enabled tags onto the chart directly in the Designer to add those tags as chart pens.


The easy chart supports any number of Y-axes. To add an axis, go to the Axes tab of the chart customizer. When adding an axis, you get a number of options such as the type (numeric or logarithmic), label, color, autorange vs fixed range, and auto-ticks vs fixed ticks. You can also modify the position of the axis, but note that by default the Chart's Auto Axis Positioning property is enabled, which means that the chart will balance the axes automatically between left and right depending on demand. As pens are turned on and off by the user, only the axes that are used by visible pens are shown.

After you add your axes, you edit any pens that you want to use your new axes. Simply choose the new axis in the axis dropdown of the pen editing window.


The Subplots feature lets you break up the chart's plot area into multiple distinct subplots that share the X axis, but have their own Y axes. This is often useful for digital data, as shown in the screenshot above. By default the chart has 1 subplot (the main plot). To add a new subplot, simply hit the add button in the Subplots tab of the chart customizer.

Subplots have relatively few options. The Weight option determines how much room the subplot gets relative to the other subplots. For example, in the screenshot above subplot #1's weight is 5, and subplot #2's weight is 1, leading to a 5-to-1 distribution of space. Just like axes, once you add your subplots you should go back to your pens and modify you pens' subplot property for any pens you want to appear on the subplot.

Pen Groups

You can put your pens in groups to break up the pens into some logical separation. For instance, in the screenshot above there are three pen groups: C1, C2, and Valves. The group name is used as the titled border for the pens' grouping container. Groups also have another purpose, but it is more advanced and most people won't have to worry about it. For more, read the Dynamic Pens section below.

Advanced Configuration

Dynamic Pens

In is often the case that you'll want to make one chart window that services many similar pieces of equipment. For instance, if you have 30 tanks and they all have the same datapoints, you want to be able to use one window for all 30 of them and simply pass the tank number into the chart window as a parameter. There are actually a number of ways to accomplish this, each method suitable for different scenarios.

Database pens have 2 ways to be made dynamic. The first is the Chart's Where Clause property. This is a snippet of SQL where clause syntax, like "machine_num = 28" that will be included for alldatabase pens in their queries. The second is to use a dynamic group. Any group can be made a dynamic group in the customizer. For each dynamic group, the easy chart will get a special dynamic property associated with that group. That property is another snippet of SQL where clause that will be applied to all database pens in that group.

The other way to make your pens (and anything else about the chart) dynamic at runtime is to use dynamic configuration. Read on...

Dynamic Configuration

The Easy Chart is not just meant to be easy to configure, but also very powerful. In particular, there is an emphasis on the ability to make any configuration change dynamically in a client - not just statically in the Designer. While a bit of scripting or clever property binding may be required, the technique is very powerful. This is achieved by storing all of the settings that you alter in the customizer in a set of expert-level dataset properties. So altering the datasets alters the chart configuration. You can inspect these various datasets, which hold the pens, axes, and subplot information, to see their format. They all look up information by column name (case-insensitive). So, if you have pen configuration stored in a database, you can bind an indirect SQL Query binding to alter the chart's pen set at runtime.


NameDescriptionProperty TypeScriptingCategory
3D X OffsetThe offset to use in the x direction for the '3D Line' pen Style Options
3D Y OffsetThe offset to use in the y direction for the '3D Line' pen Style Options
Allow Color ChangesIf true, pen colors can be set to different values.boolean.allowColorChangesBehavior
Allow Tag History InterpolationIf enabled and the query mode is not raw, the data will be interpolated for time spans with no data available.booleantagHistoryAllowInterpolationTag History
AntialiasDraw with antialias on? Makes text smoother.boolean.antialiasAppearance
Auto ApplyIf true, user changes to pen visibility will occur immediately.boolean.autoApplyBehavior
Auto Axis PositioningIf true, axes alternate automatically between left and right, rather than being placed explicitly.boolean.autoPositionAxesBehavior
Auto Color ListThe list of colors to use if auto pen coloring is enabled.Color[].autoColorListBehavior
Auto Pen ColoringIf true, pens are assigned different colors automatically.boolean.autoColorPensBehavior
AxesThis Dataset defines all axes that can be used by the pens.Dataset.axesChart Configuration
Axis FontThe font for axis labels.Font.axisLabelFontAppearance
Background ColorThe background color of the component.Color.backgroundAppearance
Bar MarginThe margin to use for the 'Bar' pen style.double.barMarginPen Style Options
BorderThe border surrounding this component. NOTE that the border is unaffected by rotation.Border.borderAppearance
Box FillFor historical-mode date range. The fill color for the selection box.Color.boxFillHistorical Range
Button SizeThe size of the utility button Buttons
Bypass Tag History CacheIf true, tag history queries will not use the client history cache.boolean.tagHistoryBypassCacheTag History
Calculated PensThis Dataset defines the calculated pens for the chart.Dataset.calcPensChart Configuration
Chart BorderThe border for the chart itself.Border.chartBorderAppearance
Chart ModeAffects the mode that the chart operates in; Manual Mode, Historical Mode, Realtime Mode.
0 - Manual
1 - Historical
2 - Realtime
Chart TitleSets an optional title to be displayed above the chart.String.titleAppearance
CursorThe mouse cursor to use when hovering over this
DB PensThis Dataset defines all of the database pens for the chart.Dataset.pensChart Configuration
Date Editor BackgroundThe background color for the date editor.Color.editorBackgroundColorAppearance
Date Editor ForegroundThe foreground color for the date editor.Color.editorForegroundColorAppearance
Date RangeAffects the position of the date range
Date Range BorderThe border for the date range control, if visible.Border.dateRangeBorderAppearance
Date StyleThe style to display dates in. For international Range
Digital GapThe size of the gap to use between digital pens.double.digitalGapPen Style Options
Empty Group NameThe group name to use for pens that are not in a pen group.String.emptyGroupNameBehavior
End DateFor manual-mode. The end date to use for selecting pen dataDate.endDateData
FontFont of text on this component.Font.fontAppearance
Foreground ColorThe foreground color of the component.Color.foregroundAppearance
Gap ThresholdThe relative threshold to use for determining continuity breaks for the 'Discontinous Line' pen style.double.gapThresholdPen Style Options
Gridline ColorThe color of the gridlines.Color.gridlineColorAppearance
Gridline Dash PatternEnter a string of comma-delimited numbers which indicate the stroke pattern for a dashed line. For instance, "3,5" means three pixels on, five pixels off.String.gridlineDashPatternAppearance
Gridline WidthThe width (thickness) of the gridlines.float.gridlineWidthAppearance
Group PensIf true, pens will be grouped by their group name.boolean.penGroupingBehavior
High Density ColorFor historical-mode date range. The color used to indicate high data density.Color.highDensityColorHistorical Range
Horiz GapThe horizontal spacing to use for the pen
Ignore Bad Quality DataIf true, causes the system to ignore any bad quality data.booleantagHistoryIgnoreBadDataTag History
Invert Time AxisIf true, the time axis values will increase from the right to left or from top to bottom depending on the Plot Orientation.boolean.invertTimeAxisLayout
LegendWhere the legend should appear, if
Max SelectionFor historical-mode date range. The maximum size of the selected date range.String.maxSelectionSizeHistorical Range
Maximize PlotIf true, displays maximized plot.boolean.currentlyMaximizedLayout
Mouseover TextThe text that is displayed in the tooltip which pops up on mouseover of this component.String.toolTipTextCommon
NameThe name of this component.String.nameCommon
Outer Range EndFor historical-mode date range. The end date for the outer range.Date.outerRangeEndHistorical Range
Outer Range StartFor historical-mode date range. The start date for the outer range.Date.outerRangeStartHistorical Range
Pen Control BorderThe border for the pen control panel, if visible.Border.penBorderAppearance
Pen Control ModeThe style in which the pen control panel alters the chart configuration. In heavyweight mode, unchecked pens are not queried, so checking and unchecking pens refreshes the chart. In lightweight mode, all pens are constantly queried, so checking and unchecking pens is
Pen Control?Controls whether or not end-users can turn on and off pens.boolean.allowPenManipulationBehavior
Plot BackgroundThe background color for all plots, unless they override it.Color.plotBackgroundAppearance
Plot OrientationThe plot orientation for all
Plot OutlineThe color to use for the plot outline.Color.plotOutlineColorAppearance
Poll RateThe rate (in milliseconds) at which this chart's queries poll. Historical charts don't use this
Properties LoadingThe number of properties currently being loaded. (Read only. Usable in bindings and scripting.)int.propertiesLoadingUncategorized
Realtime TextFor realtime-mode date range. The text to display on the realtime date control.String.rtLabelRealtime Range
Selected X ValueThe selected domain axis value for X-Trace and Mark modes. (Read only. Usable in bindings and scripting.)String.selectedXValueUncategorized
Selection HighlightFor historical-mode date range. The focus highlight color for the selection box.Color.selectionHighlightHistorical Range
Show DensityFor historical-mode date range. If true, a data density histogram will be shown in the date range.boolean.showHistogramHistorical Range
Show LoadingIf true, an animated indicator will be shown when data is loading.boolean.showLoadingBehavior
Show Maximize Button?If true, a small maximize button will be displayed next to the chart.boolean.showMaximizeUtility Buttons
Show Popup?If true, a popup menu will be shown on right-click that allows the user to change mode, print, save, etc.boolean.showPopupBehavior
Show Print Button?If true, a small print button will be displayed next to the chart..boolean.showPrintUtility Buttons
Show Save Button?If true, a small save button will be displayed next to the chart.boolean.showSaveUtility Buttons
Show Tooltips?If true, tooltips showing point values will be displayed on the chart.boolean.tooltipsBehavior
Show WarningsIf true, warnings generated during chart configuration will be printed to the console.boolean.showWarningsBehavior
Sort PensIf true, pens visibility checkboxes will be sorted.boolean.alphabetizePensLayout
Start DateFor manual-mode. The start date to use for selecting pen data.Date.startDateData
Startup RangeFor historical-mode date range. If startup mode is Automatic, this will be the starting range of time available for selection.String.startupRangeHistorical Range
Startup SelectionFor historical-mode date range. If startup mode is Automatic, this will be the starting selected range.String.startupSelectionHistorical Range
Subplot GapThe gap between subplots.double.subplotGapLayout
SubplotsThis Dataset defines all subplots' relative size and color.Dataset.subplotsChart Configuration
Tag History ResolutionThe number of datapoints to request for tag history pens. -1 means raw data, 0 means automatic, which uses the width of the History
Tag History Resolution ModeThe mode used for the number of requested points. Fixed will use the Tag History Resolution Size, Natural will return a value per scanclass execution, Chart Width will be based on the actual width of the chart component, and Raw will be the raw data.inttagHistoryResolutionModeTag History
Tag PensThis Dataset defines all of the Tag History pens for the chart.Dataset.tagPensChart Configuration
Tick DensityFor historical-mode date range. This is multiplied by the width to determine the current ideal tick unit.float.tickDensityHistorical Range
Tick FontThe font for tick labels.Font.axisTickLabelFontAppearance
Time StyleThe style to display times of day. For international Range
Title FontThe font for the optional chart title.Font.titleFontAppearance
Today ColorFor historical-mode date range. The color of the "Today Arrow" indicator.Color.todayIndicatorColorHistorical Range
Total DatapointsThe number of datapoints being displayed by the graph. (Read only. Usable in bindings and scripting.)int.datapointsUncategorized
Track MarginFor historical-mode date range. The amount of room on either side of the slider track. May need adjusting of default font is Range
UnitFor realtime-mode date range. The selected unit of the realtime date Range
Unit CountFor realtime-mode date range. The number of units back to Range
Validate Scan Class ExecutionsCauses the tag history query to verify the scan class execution records, generating bad data for the time periods where the scanclasses did not execute.booleantagHistoryValidateScanclassTag History
Vert GapThe vertical spacing to use for the pen
VisibleIf disabled, the component will be hidden.boolean.visibleCommon
Where ClauseA snippet of where clause that will be applied to all pens, like "TankNum = 2".String.globalWhereClauseData
X Axis AutoRange?If true, the X axis will automatically fit the range of available data, if false, it will display a fixed range based on the start date and end date.boolean.xAxisAutoRangeBehavior
X Axis LabelThe label shown on the X Axis (time axis).String.xAxisLabelAppearance
X Axis MarginA margin for the upper and lower ends of the x axis, expressed as a percentage of the total range.double.xAxisMarginBehavior
X Axis VisibleShould the x-axis be displayed?boolean.xAxisVisibleAppearance
X-Trace Large Number FormatThe large decimal format for the x-trace value in the Easy Chart.String.xTraceLargeNumberFormatAppearance
X-Trace Number Format ThresholdIf the magnitude of the to-be-formatted value is below this threshold, then the X-Trace Small Number Format will be used.double.xTraceNumberFormatThresholdAppearance
X-Trace Small Number FormatThe small decimal format for the x-trace value in the Easy Chart.String.xTraceSmallNumberFormatAppearance
X-Trace Track MouseIf set enabled, and the chart is set to X-Trace mode, the X-Trace will auto track the mouse position while the cursor is over the component. This is particularly useful when displaying the Easy Chart on a touchscreen.booleanxTraceTrackMouseAppearance


See the Easy Chart Scripting Functions page for the full list of scripting functions available for this component.

Event Handlers

Event handlers allow you to run a script based off specific triggers. See the full list of available event handlers on the Component Events page


Refer to the Easy Chart Customizer and the Easy Chart sections of the manual for examples and tutorials on how to use the Easy Chart Customizer. With the customizer, you can set up: