Pie Chart+

Overview

Pie Chart+ shows how numeric values contribute to a whole. Choose a pie, donut, half-donut, or polar layout and display names, values, or percentages in the legend and labels.

When to use it

Use Pie Chart+ when you need to:

• Compare the relative contribution of a small number of values.
• Show a part-to-whole relationship at the current display time.
• Place a total value in the center of a donut chart.

Use a bar chart when precise comparisons or many categories are more important than the part-to-whole relationship.

Before you begin

• Prepare two or more numeric PI Points or AF attributes.
• Use compatible units when the values represent parts of the same total.
• Limit the number of slices so labels and colors remain distinguishable.

Add and set up the symbol

1. Select Pie Chart Plus in the PI Vision symbol gallery.
2. Drag the numeric data sources onto the display.
3. Right-click the symbol and select Configure Pie Chart.
4. Select the chart type and enable the legend or data labels needed by operators.
5. Confirm that every slice represents the expected data source and value.

Use the symbol

Compare slice size to understand each value's share of the whole. Use the legend or data labels to read exact names, values, and percentages. Hover over a slice to display its configured tooltip.

Configure the symbol

Chart type

Select one of four layouts:

Type	Example	Description
Pie		Displays a complete circular pie.
Donut		Adds an open center that can contain a total label.
Half Donut		Uses a semicircular layout.
Polar		Uses radial bar length to compare values.

Titles and appearance

• Title: Sets the main chart heading.
• Sub title: Sets the secondary line below the title.
• Foreground: Sets the chart text color.
• Background: Sets the chart background color.
• Border width and color: Sets the chart outline.
• Shadow: Adds or removes a drop shadow.

Legend

• Enabled: Shows or hides the legend.
• Position: Places the legend above, below, to the left, or to the right of the chart.
• Alignment: Aligns the legend entries within the available space.
• Font size: Sets the legend text size.
• Format: Shows the name, value, percentage, or a combination of these fields.

Data labels

• Enabled: Shows or hides labels on the slices.
• Foreground: Sets the label text color.
• Background: Sets the fill behind each label.
• Font size: Sets the label text size.
• Format: Shows the name, value, percentage, or a combination of these fields.
• Hide zeros: Omits labels for values equal to zero.

Tooltip

• Enabled: Turns the hover tooltip on or off.
• Font size: Sets the tooltip text size.
• Format: Shows the name, value, percentage, or a combination of these fields.

Center label

Donut and half-donut charts can display the sum of all slice values in the center of the chart.

Troubleshooting and limitations

• A slice is missing: Confirm that its data source returns a valid numeric value and is not being hidden as zero.
• Labels overlap: Increase the symbol size, reduce the number of data sources, or use the legend instead of labels.
• Percentages are misleading: Confirm that the values use compatible units and represent parts of the same total.
• The center label is unavailable: Select Donut or Half Donut as the chart type.