Requirements
Layers must be turned on for your organization. To turn on layers, contact Omni support. Layers apply to X/Y charts: bar, line, area, and scatter. Other chart types, such as tables, pie charts, and maps, don’t use layers. When enabled, new X/Y charts use layers automatically. Existing charts keep the classic editor until you move them to layers. Refer to Switch between the layers and classic editors to move an existing chart to layers, or to move a chart back.How layers work
Each measure on the Y-axis is one layer. A chart with one Y-axis shows a single Y-Axis section. When you drag a field over it, or when the chart has a right axis, the section splits into Left-Axis and Right-Axis, and each axis has its own scale. The first layer in a list draws on top. Drag a layer by its handle to change the order. A layer that stacks, such as a bar layer colored byStatus, stacks only its own segments. Separate layers never stack on each other. To stack or group several measures together, put them in one Measure values layer.
Chart options
When a chart uses layers, the Chart options panel has two tabs:- Chart - The axes, the layers, Small multiples, Tooltip, Measure values, and Available fields
- Styles - The chart palette and the legends
Add and change fields
You can drag fields to the axes and other sections. You can also use these controls:- Click + in a section header, or click an empty Add a field slot, to pick a field from a list.
- Right-click a field, or open its menu, to use these options:
- Field properties… - Opens the field’s title, format, and analytics settings, such as regression lines and moving averages
- Aggregation - Changes how the field aggregates
- Switch to… - Replaces the field with another field in place
- Click the X on a field to remove it.
Layer settings
Each layer has these rows:
Click the icon at the end of a row to open more options for that row.
Change every layer at once
When a chart has two or more layers, an All layers header displays above them. Open the header’s menu to set the same value on every layer. A value set from All layers replaces the value on each layer.
Stacking
A layer can stack when it has a color field. For a Measure values layer, the color field is usually Measure names. The Stacking select displays next to the layer’s mark only when the layer has a color field.
Bar and area layers stack by default. Line and scatter layers overlay by default.
A chart with two or more measure layers and no color field overlays the layers. To stack the measures, move them into Measure values.
Stack order
For a Stacked or Stacked % layer, open the mark options to control the order of the segments:- Sort stack by - The segment order:
- Label - Alphabetical by the color field’s values
- Segment value - By each segment’s value within its own stack. Not available for area or line layers.
- Overall sum - By each segment’s total across all stacks
- Unsorted - The order of the query results
- Sort order - Ascending or descending, for example Ascending (A to Z) or Descending (Z to A). This setting doesn’t display for Unsorted.
Percentage axes
Layers on one axis share that axis’s scale. The axis shows percentages only when every layer on it uses Stacked %. If you mix Stacked % with another option on one axis, a warning icon displays on the layer. The percentage layer’s values run from 0 to 1 on the same scale as the other layers, so it’s squashed at the bottom of the chart.Color and legends
One color setup per field
Color settings belong to the field, not to the layer. If two layers color byCountry, they share one set of colors and one legend. A change to the colors from one layer also changes the other layer.
Chart palette
The Styles tab has the Default chart palette for the chart. All layers take colors from this palette unless a layer’s color field has its own palette. Omni assigns palette colors in this order, so that layers don’t duplicate colors:- Layers without a color field take the first colors, one each.
- Each color field takes the next batch of colors, one for each of its values.
colors parameter, keeps its place and doesn’t move the other colors.
Legends
The Styles tab also lists each legend on the chart. A chart has one legend for each color field and each size field. When a chart has two or more layers, the layers without a color field share one Series legend, which has no title by default.
Filter with the legend
Legends in the chart are interactive. Click an item in a legend to show only that item. Cmd+click (Mac) or Ctrl+click (Windows) to select more than one item. When you select items in one legend, layers that belong to other legends are hidden until you clear the selection.Labels and totals
Labels are set per layer. Pick a field in a layer’s Label row to label that layer. The field doesn’t have to be the layer’s measure. For a stacked layer, the label options include Simple totals, which labels the total of each stack. Simple totals are calculated per layer. To total several measures, put them in one Measure values layer and turn on Simple totals for that layer.
Tooltips
On line, area, and scatter layers, the tooltip displays when you hover near a point, and the point is highlighted.Axis sort order
For a text field on the X-axis:- Automatic keeps the order of the query results when the query is sorted.
- Ascending sorts alphabetically.
- Descending sorts in reverse alphabetical order.
Limitations
- Separate layers don’t stack on each other. Use Measure values to stack measures.
- Each color field has one set of colors for the whole chart. You can’t color the same field differently in two layers.
- Layers on one axis share the axis’s scale and title.
- Two layers that each leave out a different dimension can’t both get totals. One of them looks jagged. Refer to Smart aggregation.
- Size is available only on Scatter layers. If you change a scatter layer to another mark, its size setting is removed.