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Gauge plots
, also known as speedometer or dial plots, are suitable for visualizing a single data point within a specified range, often in relation to a target or goal. These plots are particularly useful when you want to communicate progress or performance in a visually appealing manner.
For instance, the plot in the Gauge Plot Demo provides a visual representation of customer satisfaction levels across four different aspects of a product or service: Product Quality
, Delivery Speed
, Ease of Use
, and Pricing
. The plot uses a color-coded scale, where satisfaction scores range from 1 (Very Dissatisfied)
to 100 (Very Satisfied)
.
If you add a chart into a report, set the plot type to Gauge
on the first screen of the Chart Wizard
, and click the Next
button, the wizard shows the Gauge Settings
screen that looks like the following
The Fields
editor lets you define the scale ranges for the gauge.
The Gauge Pointer
editor enables you to establish the value indicated by the pointer.
The Gauge Label
editor helps you customize the text displayed within the gauge.
The Values
collection for the Gauge plot establishes the divisions on the gauge's scale. Each Value
represents the upper bound of the range. The values should be specified in the descending order – from the largest to the smallest value. The plot picks up colors for ranges from the Chart Palette.
For each Value, you can specify the CAPTION
property that will be displayed in the Legend if you set the Show Values Names in Legend
flag in the plot properties.
For example, in the Gauge Plot Demo, four named values are used to set up the scale ranges: 100
, 75
, 50
, and 25
. As a result, you will observe four distinct intervals, each with a different color, on the gauge scale and the legend displaying the intervals' names.
A gauge plot includes the Y axis
that allows you to configure the appearance of the labels on the gauge's scale and other properties as described in the axes' documentation.
The Gauge Pointers
collection enables you to create multiple pointers to highlight specific points on the gauge scale. For each pointer, you can customize these properties:
The Background Color
expression sets the fill color for a pointer.
The Needle Width
length value determines the pointer's size.
The Needle Pin Width
length value adjusts the size of the circle situated at the base of a pointer.
The End
expression specifies the value represented by the pointer.
For example, in the Gauge Plot Demo, the pointer's End
is set to the {satisfaction_score}
expression so that the pointer represents the score of the current aspect.
The Gauge Labels
collection enables you to include text elements that appear within the gauge. For each label, you can configure the following properties:
The Text
expression sets the content of the label.
The Offset X
and Offset Y
length values determine the label's position relative to the gauge's center.
The subset of the text properties allow you to customize the appearance of the label.
For instance, in the Gauge demo, the sole label's Text is configured with the {aspect}
expression, ensuring that the current aspect is displayed close to the pointer.
The properties below help customize the appearance of a Gauge
plot. See their effects in action by adjusting the configuration in the Gauge Plot Demo.
Opacity
: a number expressed as a percentage, which sets the opacity of the gauge scale and pointers. 100%
means opaque, and 0%
means fully transparent.
Inner Radius
: a number representing the percentage of the outer radius that defines the space between the gauge scale and its center.
Start Angle
: a number in arc degrees specifying the plot's clockwise rotation. A full rotation is 360
degrees.
Sweep
: a number in arc degrees ranging from 0
to 360
, determining the arc length occupied by the plot.
Clipping Mode
: defines how the plot area renders a plot:
Fit
means the plot area uses all available space to fit the plot.
Clip
means the plot area truncates the plot at the edge of its right or bottom padding.
None
is equivalent to Fit
.
Line properties in the Style
section affect the appearance of the scale's range borders.
A color expression in the Background
section determines the fill color of the scale's ranges, overriding the Chart Palette
colors.
This group of properties determine the Interactive Action when a report reader clicks inside the gauge's scale. You can use bound field references to pass parameters in a drill-through report or configure a dynamic bookmark or URL. The field value is evaluated in the current data scope. Visit the Drill-Through Reports Walkthrough for more information. It explains how to set up the drill-through column plot, but the same technique is applicable for a gauge plot.