Pie Chart

Overview

A pie chart is a visualization used to show how individual parts contribute to a whole. Each slice represents a category’s share of the total, making it well-suited for illustrating proportional relationships at a single point in time. You can use pie charts to evaluate distribution, identify dominant categories, or highlight relative contributions. You can also expand the analysis by adding labels, tooltips, or formatting options to improve readability. This article explains the data requirements for pie charts and details the key properties available for customizing their appearance and interactions.

Example

This is an example of a pie chart that displays profit by category, using the following Excel dataset:

SalesData.xlsx

The Profit measure is bound to the Value data binding slot. The Category measure is bound to the Axis (Category) slot. The title is set to Profit by 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 circle, depending 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.

Customize Pie Chart

A pie chart displays the proportional distribution of values within a single category, allowing users to understand how individual parts contribute to a whole. After adding the visualization to the designer and binding your dataset, configure the following fields in the Data Binding tab:

• Values – The numeric measure that determines the size of each slice. The values are aggregated and used to calculate each slice’s proportion relative to the total.

• Legend (Series) – The categorical field that divides the pie into multiple slices. Each unique legend value is rendered as its own slice, showing how each category contributes to the overall total.

For example, a pie chart may plot Sales in the Values slot and Category in the Legend (Series) slot, producing a clear visualization of how total sales are distributed across product categories.

Customize the Chart Style

The Chart Style section contains the visual and formatting settings that define the appearance of your column chart. These options are managed in the Inspector Panel and include layout, spacing, color, and stylistic adjustments that help you tailor the chart to your dashboard’s design requirements.

Scenario Name

The Scenario Name is the label shown in Wyn’s Explorer.

• Choose a name that reflects the purpose of the visualization.

• For more details, see Explorer documentation.

Palette

Controls whether the chart uses theme colors or custom colors.

• Off (default): chart uses the dashboard theme.

• On: unlocks manual color selection for each column.

Color Assignments

Defines custom colors when Maintain Color Assignments is enabled.

• Assign colors to individual categories or series.

• Use when theme colors do not meet your design needs.

Start Angle

Defines the position where the first slice of the pie chart begins.

The default value is 0, which places the first slice at the top of the chart and draws subsequent slices clockwise.

Adjusting the start angle rotates the entire pie, which can help improve readability or align slices with other visual elements.

Here is an example of a pie chart with a start angle of 45 degrees.

Sweep

Controls how much of the circular shape the pie chart covers.

The default value is 360, rendering a full circular pie chart.

Reducing the sweep value creates a partial pie, such as a semi-circle, which can be useful for compact layouts or gauge-style visualizations.

Here is an example of a half-circle pie chart with the sweep set to 180.

Radius

Determines the size of the pie chart measured from the center outward.

The radius range is from 0 to 75, where 0 represents the inner radius and 75 represents the outer radius.

Setting the inner radius to a value greater than 0 creates a donut-style chart by introducing a hollow center.

Here is an example of a pie chart with an inner radius set to 20.

Corner Radius

Rounds the outer edges of each pie slice.

The default value is 0, which produces sharp slice edges.

Increasing the corner radius softens slice boundaries, resulting in a smoother and more rounded appearance.

Here is an example where the corner radius is set to 10.

Auto Gradient

Applies a gradient fill to column colors.

• On: Wyn auto-generates gradient effects.

• Off: columns use flat colors.

Item Space

Controls the spacing between individual pie slices.

The default value is 0, meaning slices are rendered without gaps.

Increasing the value creates visible separation between slices, which can improve distinction between categories.

Here is an example of a pie chart with an item space set to 5.

See Also

• Animation

• Data Visualization

• Interaction

• Title

• Data Labels

• Tooltip

• Axis (Category)

• Value Axis

• Legend

• Series

• Trellis

• Drill Down

• Special Data

• No Data Content

• Layout

• Appearance

Property Reference

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.

Start Angle: Defines the position where the first slice of the pie chart begins. The default value is 0, meaning the first slice starts at the top and proceeds clockwise.

Sweep: Controls how much of the circle the pie chart covers, with a default of 360 for a full circle. You can reduce this value to create a partial or semi-circular chart.

Radius: Determines the size of the chart from the center outward. The default range is from 0 to 75, where 0 is the inner radius and 75 is the outer radius. Setting the inner radius to a value greater than 0 creates a donut-style appearance.

Corner Radius: Rounds the outer edges of each slice; by default, it is 0, resulting in sharp edges, but increasing it will soften the slice borders.

Auto Gradient: Enables a gradient color effect on each slice when set to True, adding visual depth to the chart.

Item Space: Sets the spacing between pie slices. A value of 0 means no space, while higher values create gaps between the slices.

Data Visualization

• Top N Grouping – When enabled, limits the displayed data to the top N items based on a chosen measure (e.g., top 10 categories by sales). This is useful for focusing on the most significant data points.

  • Additional Option: When this setting is turned on, a Show property appears, allowing you to enter a numeric value for N (the number of top items to display).

  • Default: Off.

• Include All Dimensions – When enabled, ensures that all available dimension values are included in the visualization, even if they have no corresponding measure values. This can help maintain consistent category representation across views. Default: Off.

Data Labels

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

• Display Pattern: Choose a label structure from:

  • Series (Value/Percentage)

  • Series Value/Percentage

  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.

  • Value As Percentage – toggle on to display the value as a percentage.

  • Decimal Places - set the number of decimal places in the percentage.

• Series Name: Set to True to display series name.

• Location: Choose between On Slice or Around.

• Line Width: Set the line width of data labels.

• Connecting Line Color: Set the color of the connecting line in the data label

• Display Mode ???

• 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.

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.