Bubble Chart

Bubble charts are used to visualize the relationship between three quantitative variables in a single view. Each data point is plotted along two axes—typically representing measures such as value and time—while a third measure determines the relative size of the bubble. This type of chart is useful for exploring correlation patterns, highlighting outliers, and comparing the magnitude of individual observations within a dataset. Bubble charts support flexible data binding, allowing you to assign fields to the x-axis, y-axis, bubble size, and optional category or tooltip fields. This article explains the required bindings and key customization properties that allow you to format bubbles, adjust scale and layout, and refine how data values are presented.

Example

This is an example of the bubble chart that displays the profit and revenue by quantity using the following Excel dataset:

SalesData.xlsx

The Profit measure is bound to the Size slot. The Revenue measure is bound to the X Axis slot. The Quantity measure is bound to the Y Axis slot.

You can add a title in two ways:

• Option 1: In the Inspector panel, under Title, enter:

  Profit and Revenue by Quantity

• Option 2: Rename the bound attributes directly in the Data Binding tab.

  Click the gear icon next to each attribute, choose Rename, and enter the desired display name.

Data Binding

The Data Binding tab allows you to assign data fields to chart elements and configure how the data is displayed.

• Size – Drag a numeric field here to determine the size of each bubble.

  • Ellipsis menu:

    • Data Format – Opens the data format dialog to customize number formatting.

    • Display Unit – Choose how values are scaled: Auto (default), None, Thousands, Millions, Billions, or Trillions.

• X Axis – Drag a numeric or categorical field here to define the horizontal position of each bubble.

  • Ellipsis menu: Same as Size.

• Y Axis – Drag a numeric field here to define the vertical position of each bubble.

  • Ellipsis menu: Same as Size.

• Legend (Series) – Drag a categorical field here to group bubbles into series, which are distinguished by color.

• Trellis Columns – Drag a categorical field here to create a column-based small multiple layout. Each column displays a subset of the data based on the field value.

• Trellis Rows – Drag a categorical field here to create a row-based small multiple layout. Each row displays a subset of the data based on the field value.

• Tooltip – Drag one or more fields here to display additional information when a user hovers over a bubble.

  • Ellipsis menu: Same as Size.

• Drill Down – Enables hierarchical exploration of data points.

  • Mode – Determines the drill-down method. Default is Default.

  • Dropdown options:

    • Pre-set Targets – When selected, opens a data binding slot to specify Drill Down Targets.

    • Pre-set Path – When selected, opens a data binding slot to specify Drill Down Paths.

Property Reference

Bubble 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.

Axis Mode – Determines how the chart axes are displayed:

• Cartesian (default) – Standard X and Y coordinate axes.

• Radial – Axes radiate out from a central point.

• Polygonal – Axes form a polygon shape for data plotting.

Auto Gradient – A toggle option that, when enabled, automatically applies a gradient color effect to the plotted symbols. Default is false.

Symbol Shape – Specifies the shape used for data points:

• Dot (default) – Standard circular marker.

• Box – Square marker.

• Triangle – Equilateral triangle marker.

• Diamond – Diamond-shaped marker.

• Plus – Plus sign marker.

• X – Cross-shaped marker.

Symbol Size – Defines the size of the data point symbols. Accepts a numerical value.

Canvas Padding – Controls the amount of blank space between the plotted data area and the edges of the chart canvas. Accepts a numerical value.

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 on the percentage value.

• Series Name: Set to True to show the series name.

• Location: Choose between On Slice or Around.

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

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

• Display Mode: Determines how data labels are displayed on the chart. You can choose between:

  • Auto: The chart automatically decides which data labels to show, based on available space.

  • All: Forces all data labels to be displayed, regardless of space constraints.

• Same Color As Legend: A toggle option that controls the color of data labels.

  • On/True: Data labels adopt the same color as their corresponding bars in the chart, matching the legend.

  • Off/False: Data labels use the default color, independent of the bar colors.

• Data Label Font Setting:

  • 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 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.

X-Axis

• Show Axis – Toggles the visibility of the X-axis. Default is On.

• Max Value / Min Value – Define the numeric upper and lower bounds for the axis scale. Leaving these blank allows the chart to automatically determine the range based on the data.

• Interval – Sets the spacing between axis tick marks. If left blank, the chart automatically calculates an appropriate interval.

• Axis Position – Determines the placement of the X-axis relative to the chart area. Options:

  • Crosses (default) – Positions the axis at the crossing point defined by Axis Crosses.

  • Bottom – Places the axis along the bottom edge of the chart.

  • Top – Places the axis along the top edge of the chart.

• Axis Crosses – Numeric value indicating the point on the opposite axis where this axis intersects.

• Show Axis Line – Toggles the visibility of the axis baseline. Default is On.

• Axis Line Width / Color / Type – Control the thickness, color, and style (solid or dashed) of the axis line.

• Show Grid Lines – Toggles horizontal grid lines extending from axis tick marks into the chart. Default is Off.

• Show Tick Labels – Toggles the display of numeric or category labels along the axis.

• Show Tick Marks – Toggles small marks indicating individual axis intervals.

• Show Title – Toggles the display of an axis title. Default is Off. 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.

• Format – Determines how axis values are displayed: General(default), Number, Currency, Percentage, or Custom.

• Display Unit – Scales displayed values to a chosen unit: Auto (default), None, Thousands, Millions, Billions, Trillions.

• Label Direction – Sets the orientation of axis labels: Horizontal (default), Vertical, Diagonal.

• Label Overflow Setting – Defines how overflowing labels are handled: Hide (default), Ellipsis, Wrap.

• Axis Font Setting – Controls the font family, size, color, weight, and style for axis labels.

Y-Axis

• Show Axis – Toggles the visibility of the X-axis. Default is On.

• Max Value / Min Value – Define the numeric upper and lower bounds for the axis scale. Leaving these blank allows the chart to automatically determine the range based on the data.

• Interval – Sets the spacing between axis tick marks. If left blank, the chart automatically calculates an appropriate interval.

• Axis Position – Determines the placement of the X-axis relative to the chart area. Options:

  • Crosses (default) – Positions the axis at the crossing point defined by Axis Crosses.

  • Bottom – Places the axis along the bottom edge of the chart.

  • Top – Places the axis along the top edge of the chart.

• Axis Crosses – Numeric value indicating the point on the opposite axis where this axis intersects.

• Show Axis Line – Toggles the visibility of the axis baseline. Default is On.

• Axis Line Width / Color / Type – Control the thickness, color, and style (solid or dashed) of the axis line.

• Show Grid Lines – Toggles horizontal grid lines extending from axis tick marks into the chart. Default is Off.

• Show Tick Labels – Toggles the display of numeric or category labels along the axis.

• Show Tick Marks – Toggles small marks indicating individual axis intervals.

• Show Title – Toggles the display of an axis title. Default is Off. 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.

• Format – Determines how axis values are displayed: General(default), Number, Currency, Percentage, or Custom.

• Display Unit – Scales displayed values to a chosen unit: Auto (default), None, Thousands, Millions, Billions, Trillions.

• Label Direction – Sets the orientation of axis labels: Horizontal (default), Vertical, Diagonal.

• Label Overflow Setting – Defines how overflowing labels are handled: Hide (default), Ellipsis, Wrap.

• Axis Font Setting – Controls the font family, size, color, weight, and style for axis labels.

Legend

By default, the Show Legend toggle is set to False. 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 Position 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.

The Click Action property defines how interactions with items in the chart legend affect the data displayed in the rose chart.

You can choose from two options in the dropdown menu:

• Select/Unselect

  When this option is selected, clicking a legend item highlights the corresponding data attribute on the chart and dims the others. This allows you to focus on a single series or category at a time. Clicking the legend item again restores the full view of all data attributes.

• Hide/Show

  When this option is selected, clicking a legend item temporarily hides the corresponding data attribute from the chart. Clicking it again redisplays the hidden data attribute. This is useful for quickly including or excluding specific data attributes without affecting the rest of the chart configuration.

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.