Range Area Chart

Range area charts are a visualization used to display high-to-low value ranges across categories or time. Instead of showing a single value, the chart plots an upper and lower boundary and fills the space between them, making it ideal for illustrating variability, confidence intervals, or minimum–maximum spans. You can use range area charts to compare the spread of data or highlight fluctuations that might be hidden in traditional single-value visuals. This article explains the data requirements for range area charts and provides an overview of the core properties used to customize their structure, style, and behavior.

Example

This is an example of the range area chart that displays cost by month and category using the AdventureWorks data model.

The UnitPrice attribute is bound to the Upper Value data binding slot. The Aggregation Method has been set to Max. The UnitePrice is also bound to the Lower Value data binding slot, but this time setting the Aggregation Method to Min. The OrderDate(Month) attribute is bound to the Axis (Category) slot. The Category attribute is bound to the Legend (Series) slot. The Title has been set to Unit Price by Month and Category.

Data Binding

The Data Binding tab lets you map your dataset fields to the chart’s visual elements. The available data binding slots determine what data is displayed and how it appears in the chart.

• Values – Bind the numeric field or measure that determines the size/length/value of each bar, slice, point, or shape. Larger values produce proportionally larger bars/slices/points.

• Axis (Category) – Bind the field whose distinct values define each bar/slice/point category. These values appear along the X-axis, Y-axis, or around the circledepending on the chart type.

• Legend (Series) – Bind the field that determines the grouping shown in the chart legend. Use this to categorize and color bars/slices/lines by an additional dimension.

• Trellis Columns – Bind a field to create multiple charts arranged in columns, each filtered by a unique value in that field.

• Trellis Rows – Bind a field to create multiple charts arranged in rows, each filtered by a unique value in that field.

• Tooltip – Bind additional fields to display as contextual information when users hover over a bar, slice, point, or shape.

• Drill Down – Configure interactive navigation into more detailed data. You can set Drill Down Mode to:

  • Pre-set Targets – Specify fields or charts to drill into when an element is clicked.

  • Pre-set Paths – Define a hierarchical path so users can explore data through multiple levels.

Property Reference

Range area charts in Wyn can be extensively styled and configured using the Inspector panel. Below are key settings you can modify:

Chart Style

Maintain Color Assignments: Toggle this to True if you want to manually assign specific colors to individual data values instead of using automatic color mapping.

Palette: Lets you customize the color scheme applied to the chart. Use the dropdown to choose from available color palettes based on the current Theme.

Graph Opacity: Controls the transparency of the chart. Set to 0% for fully transparent or 100% for fully opaque.

Line Style – Defines the curve or shape of the line. Choose from:

• Default – Straight lines between data points.

• Spline – Smooth, curved lines between data points.

• Step – Right-angled lines that connect points in a stepped pattern.

Line Type – Sets the visual style of the line. Choose Solid for an unbroken line or Dashed for a line made of dashes.

Line Thickness – Specifies the thickness of the line in pixels. Enter a numeric value.

Show Null As – Determines how the chart displays null (missing) values. Choose from:

• Connected – Joins the points on either side of the null value with a line.

• Gaps – Leaves an empty space where the null value occurs.

• Zeros – Treats null values as zero.

Show Symbol – Toggles the display of symbols at each data point. When set to True, additional symbol properties appear:

• Symbol Shape – Choose the shape for the marker: Dot, Box, Triangle, Diamond, Plus, or X.

• Symbol Size – Specifies the size of the symbol in pixels. Enter a numeric value.

• Symbol Fill – Sets the fill color inside the symbol.

• Symbol Stroke – Sets the border color (stroke) around the symbol.

Auto Gap Width: Enabled by default. This controls the spacing between bars. To manually define the gap width, switch this setting to False.

Auto Gradient: When enabled, applies a gradient effect to the chart colors for a more dynamic visual appearance.

Reverse Color: Specifies the fill color used when the chart detects that the lower value exceeds the upper value in a range area chart.

This color acts as an indicator for inverted or reversed ranges, helping identify when the upper and lower value bindings are swapped or incorrectly configured.

If the upper value is always greater than or equal to the lower value, the reverse color will not appear.

Canvas Padding: Adds space around the chart to separate it from the edges of the scenario or dashboard layout.

Data Labels

• Show Data Label: Toggle this on to enable data labels on the chart.

• Display Pattern: Choose a label structure from:

  • Category

  • Series (Value)

  • Category Series Value

  Note: This controls the format, but not which elements are shown.

• Toggle Visibility for Each Element:

  • Value – must be set to true to display values.

  • Series Name – toggle on to display the series name.

  • Category Name – toggle on to display the category.

• Display Mode: Set to All to show all enabled elements together.

• Label Location: Choose between On Slice or Around.

• Same Color as Legend: Toggle on to match the label color with the legend entry.

• Font Settings (same as title):

  • Font family, size (pt), color, weight, and italic styling.

• Show Shape: Toggle on to add a background shape to the label.

  • Upload a Shape Image.

  • Adjust placement and size with:

    • Shape X Center

    • Shape Y Center

    • Shape X Scale

    • Shape Y Scale

Tooltip

Tooltip Mode – Determines how tooltips are displayed when hovering over the chart:

• None – Disables tooltips.

• Data Point (default) – Shows a tooltip for the specific data point under the pointer.

• Category – Shows a tooltip for all data points that share the same category value.

Show Category Tracking Area – Highlights the entire area of the chart that corresponds to the hovered category, helping visually connect related data points.

Show Category Tracking Line – Draws a vertical or horizontal line (depending on chart orientation) across the chart at the hovered category to make it easier to see alignment across series.

Show Point Cross Value Axis – Draws a line from the hovered point to the value axis, making it easy to identify the exact value.

Show Point Cross Category Axis – Draws a line from the hovered point to the category axis, making it easy to identify the exact category.

Axis (Category)

The Category (Y) Axis settings give you full control over the vertical axis of the chart.

• Show Axis: Enabled by default. Toggle off to hide the Y-axis entirely.

• Axis Position: Set the axis placement using the dropdown options: Zero, Bottom, or Top.

Axis Line and Grid

• Show Axis Line: Enabled by default. Controls the visibility of the axis line. You can customize its line type(Solid or Dashed), color, and width.

• Show Grid Lines: Disabled by default. Enable to add horizontal grid lines across the chart, and customize their type, color, and width.

• Show Split Area: Disabled by default. Toggle on to highlight alternating background bands, and define Odd Area Color and Even Area Color.

Labels and Tick Marks

• Show Tick Labels: Enabled by default. Use this toggle to show or hide the axis labels.

• Label Direction: Choose how labels are displayed: Horizontal, Vertical, or Diagonal.

• Label Overflow: Define how long labels behave when space is limited: Hide, Ellipsis, or Wrap.

• Show Tick Marks: Enable this toggle to display tick marks along the axis.

Title and Font Styling

• Show Title: Disabled by default. Once enabled, the axis automatically takes the name of the data attribute it is bound to. To change that, you can enter a title in Custom Title.

• Axis Font Settings: Customize the appearance of axis labels and title by adjusting the font family, size, color, weight, and style.

Value Axis

The Value (X) Axis settings let you configure the numerical axis of your chart, typically displayed horizontally.

• Show Axis: Enabled by default. Toggle this off to hide the entire axis.

• Min Value / Max Value: Define a fixed range for the axis.

• Interval: Set custom spacing between tick marks.

• Reversed: Flip the axis direction (e.g., highest values on the left). Disabled by default.

• Axis Position: Choose whether the axis appears at the Top or Bottom of the chart.

Axis Line and Grid

• Show Axis Line: Enabled by default. Controls the visibility of the axis line. Customize the line’s type (Solid or Dashed), color, and width.

• Show Grid Lines: Disabled by default. Enable to display horizontal lines across the chart. You can customize their line type, color, and width.

• Show Split Area: Highlight alternating vertical bands by setting Odd Area Color and Even Area Color.

Labels and Tick Marks

• Show Tick Labels: Enabled by default. Toggle this to show or hide labels along the axis.

• Format: Choose how labels are displayed (General, Number, Currency, Percentage, or Custom).

• Display Unit: Scale values using Auto, None, Thousands, Millions, etc.

• Label Direction: Set label orientation to Horizontal, Vertical, or Diagonal.

• Show Tick Marks: Toggle to display or hide the tick marks themselves.

Title and Units

• Show Title: Disabled by default. Once enabled, the axis automatically takes the name of the data attribute it is bound to. To change that, you can enter a title in Custom Title.

• Show Unit's Label: Enable this option to display a unit label (e.g., USD, %).

Font Customization

• Axis Font Settings: Customize the axis text by choosing the font family, size, color, weight, and style.

Legend

By default, the Show Legend toggle is set to True, which displays the legend on the chart. To include a title for the legend, enable the Title toggle as well. Once enabled, the legend automatically takes the name of the data attribute it is bound to. To change that, you can enter a title in Custom Title. You can customize the title by setting the Font Family (e.g., Arial), Font Size, Text Color, Font Weight (such as bold), and applying Italic styling if desired.

The Title Alignment property allows you to position the legend title to the left, center, or right of the chart area.

The legend is set to Auto Size by default. To manually define the legend size, disable this setting by setting Auto Size to False. You can also control the Horizontal and Vertical Alignment, which are both set to Auto by default, but can be changed using dropdown options. To allow legend labels to wrap across lines, set the Wrap Legend option to True.

Trellis

Use the Trellis properties when you create a Trellis Chart. This can be done in the Data Binding Tab. Drag and drop the attribute to Trellis.

You can set the Padding around the Trellis Chart to control the spacing between the chart content and its edges. You can also define a Trellis Border Color to outline each panel of the trellis. Additionally, the Trellis Font Settings allow you to customize the font family, size, color, weight, and style of the text used in the trellis layout.

Drill Down Setting

• Position – Determines where the drill-down navigation bar is displayed on the chart. Options include:

  • Top left (default)

  • Top center

  • Top right

  • Bottom left

  • Bottom center

  • Bottom right

• Home Name – Specifies the text label for the top-level view in the drill-down hierarchy. The default label is Home, but you can change it to something more descriptive, such as All Regions or Main Category.

• Font – Configures the font family, size, color, weight (e.g., bold), and style (e.g., italic) for all drill-down navigation text.

• Current Level Font Color – Sets the color for the label of the currently active drill-down level, helping it stand out from other levels.

• Other Levels Font Color – Sets the color for labels representing all non-active drill-down levels, allowing users to visually distinguish between the active and inactive levels in the navigation path.