Angular Linear Gauge Overview
The Ignite UI for Angular linear gauge component allows for visualizing data in the form of a linear gauge. The IgxLinearGaugeComponent provides a simple and concise view of a value compared against a scale and one or more ranges. It supports one scale, one set of tick marks and one set of labels. The component has also a built-in support for animated transitions. This animation is easily customizable by setting the transitionDuration property. The features of the linear gauge component include configurable orientation and direction, configurable visual elements such as the needle, and more.
Angular Linear Gauge Example
The following sample demonstrates how setting multiple properties on the same IgxLinearGaugeComponent can transform it to completely different linear gauge.
Dependencies
When installing the Angular gauge component, the core package must also be installed.
npm install --save igniteui-angular-core
npm install --save igniteui-angular-gauges
Component Modules
The IgxLinearGaugeComponent requires the following modules:
// app.module.ts
import { IgxLinearGaugeModule } from 'igniteui-angular-gauges';
@NgModule({
imports: [
// ...
IgxLinearGaugeModule
// ...
]
})
export class AppModule {}
Usage
The following code demonstrates how create a linear gauge containing a needle and three comparative ranges on the scale.
<igx-linear-gauge width="700px"
height="30px"
minimumValue = "5"
maximumValue = "55"
value = "43">
<igx-linear-graph-range startValue="0"
endValue="15"
brush="red">
</igx-linear-graph-range>
<igx-linear-graph-range startValue="15"
endValue="30"
brush="yellow">
</igx-linear-graph-range>
<igx-linear-graph-range startValue="30"
endValue="55"
brush="green">
</igx-linear-graph-range>
</igx-linear-gauge>
Needle
This is the primary measure displayed by the linear gauge component and is visualized as a bar or you can customize it to show almost any shape as is demonstrated below.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0
maximumValue=100 interval=10
value=50
isNeedleDraggingEnabled=true
needleShape="Custom"
needleBrush="DodgerBlue"
needleOutline="DodgerBlue"
needleStrokeThickness=1
needleBreadth=15
needleInnerExtent=0.35
needleOuterExtent=0.65
needleOuterPointExtent=0.8
needleInnerPointExtent=0.325
needleInnerPointWidth=0
needleOuterPointWidth=0.3
needleInnerBaseWidth=0
needleOuterBaseWidth=0.07>
</igx-linear-gauge>
Highlight Needle
The linear gauge can be modified to show a second needle. This will make the main needle's value appear with a lower opacity. To enable this first set highlightValueDisplayMode to Overlay and then apply a highlightValue.
<igx-linear-gauge
#linearGauge
height="80px"
width="400px"
value=70
minimumValue=0
maximumValue=100
interval=10
labelInterval=10
labelExtent=0.025
labelsPreTerminal=0
labelsPostInitial=0
needleBrush="Blue"
highlightValueDisplayMode="Overlay"
highlightValue=25
isHighlightNeedleDraggingEnabled=true>
</igx-linear-gauge>
Ranges
The ranges are visual elements that highlight a specified range of values on a scale. Their purpose is to visually communicate the qualitative state of the performance bar measure, illustrating at the same times the degree to which it resides within that state.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0 value=50
maximumValue=100 interval=10
rangeBrushes="#a4bd29, #F86232"
rangeOutlines="#a4bd29, #F86232" >
<igx-linear-graph-range
startValue=0 endValue=50
innerStartExtent=0.075 innerEndExtent=0.075
outerStartExtent=0.25 outerEndExtent=0.4>
</igx-linear-graph-range>
<igx-linear-graph-range
startValue=50 endValue=100
innerStartExtent=0.075 innerEndExtent=0.075
outerStartExtent=0.4 outerEndExtent=0.55>
</igx-linear-graph-range>
</igx-linear-gauge>
Tick Marks
The tick marks serve as a visual division of the scale into intervals in order to increase the readability of the linear gauge.
Major tick marks – The major tick marks are used as primary delimiters on the scale. The frequency they appear at, their extents and style can be controlled by setting their corresponding properties.
Minor tick marks – The minor tick marks represent helper tick marks, which might be used to additionally improve the readability of the scale and can be customized in a way similar to the major ones.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0 value=50
maximumValue=100
interval=10
tickBrush="DodgerBlue"
ticksPreTerminal=0
ticksPostInitial=0
tickStrokeThickness=2
tickStartExtent=0.25
tickEndExtent=0.05
minorTickCount=4
minorTickBrush="DarkViolet"
minorTickEndExtent=0.05
minorTickStartExtent=0.15
minorTickStrokeThickness=1>
</igx-linear-gauge>
Labels
The labels indicate the measures on the scale.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0 value=50
maximumValue=100 interval=10
labelInterval=10
labelExtent=0.025
labelsPreTerminal=0
labelsPostInitial=0
fontBrush="DodgerBlue"
font="11px Verdana">
</igx-linear-gauge>
Backing
The backing element represents background and border of the linear gauge component. It is always the first element rendered and all the rest of elements such as labels, and tick marks are overlaid on top of it.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0 value=50
maximumValue=100 interval=10
backingBrush="#bddcfc"
backingOutline="DodgerBlue"
backingStrokeThickness=4
backingInnerExtent=0
backingOuterExtent=1>
</igx-linear-gauge>
Scale
The scale is a visual element that highlights the full range of values in the linear gauge. You can customize the appearance and the shape of the scale. It can also be inverted (using isScaleInverted property) and all labels will be rendered from right-to-left instead of left-to-right.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0 value=50
maximumValue=100 interval=10
isScaleInverted=false
scaleBrush="DodgerBlue"
scaleOutline="DarkViolet"
scaleStrokeThickness=1
scaleInnerExtent=0.05
scaleOuterExtent=0.65
scaleStartExtent=0.05
scaleEndExtent=0.95>
</igx-linear-gauge>
Summary
For your convenience, all above code snippets are combined into one code block below that you can easily copy to your project and see the linear gauge with all features and visuals enabled.
<igx-linear-gauge
height="80px" width="400px"
minimumValue=0
maximumValue=100
labelInterval=10
labelExtent=0.025
labelsPreTerminal=0
labelsPostInitial=0
fontBrush="Black"
font="11px Verdana"
interval=10
tickBrush="Black"
ticksPreTerminal=0
ticksPostInitial=0
tickStrokeThickness=2
tickStartExtent=0.25
tickEndExtent=0.05
minorTickCount=4
minorTickBrush="Black"
minorTickEndExtent=0.05
minorTickStartExtent=0.15
minorTickStrokeThickness=1
value=50
isNeedleDraggingEnabled=true
needleShape="Custom"
needleBrush="Black"
needleOutline="Black"
needleStrokeThickness=1
needleBreadth=15
needleInnerExtent=0.35
needleOuterExtent=0.65
needleOuterPointExtent=0.8
needleInnerPointExtent=0.325
needleInnerPointWidth=0
needleOuterPointWidth=0.3
needleInnerBaseWidth=0
needleOuterBaseWidth=0.07
isScaleInverted=false
scaleBrush="Gray"
scaleOutline="Gray"
scaleStrokeThickness=1
scaleInnerExtent=0.05
scaleOuterExtent=0.65
scaleStartExtent=0.05
scaleEndExtent=0.95
backingBrush="#cecece"
backingOutline="#cecece"
backingStrokeThickness=4
backingInnerExtent=0
backingOuterExtent=1
rangeBrushes ="#C62828, #F96232, #FF9800"
rangeOutlines="#C62828, #F96232, #FF9800">
<igx-linear-graph-range
startValue=0 endValue=50
innerStartExtent=0.075 innerEndExtent=0.075
outerStartExtent=0.25 outerEndExtent=0.4>
</igx-linear-graph-range>
<igx-linear-graph-range
startValue=50 endValue=100
innerStartExtent=0.075 innerEndExtent=0.075
outerStartExtent=0.4 outerEndExtent=0.55>
</igx-linear-graph-range>
</igx-linear-gauge>
API References
The following is a list of API members mentioned in the above sections:
Additional Resources
You can find more information about other types of gauges in these topics:
GitHub