Codetown ::: a software developer's community
Gerrit Grunwald, aka @hansolo_ on twitter, has just ported his Swing based gauges and meters framework known as SteelSeries to JavaFX as part of the JFXtras-lab project. I can't tell you how many times since Java AWT first came out, that I have had to use meters and gauges in an application. Also, I can't count how many times I have found a dearth of open source gauge frameworks out there in the wild. Needless to say, I have been watching Gerrit's progress for several months now. Finally, he posted his work to jxftras-lab and I have been eagerly testing ever since.
One area I wanted to see is if Gerrit's gauges worked with JavaFX FXML. JavaFX FXML is an XML-based language that provides the structure for building a user interface separate from the application logic of your code. With the numerous options that Gerrit's gauges support, this is a must have. I am happy to report with a little back and forth with Gerrit over a few days, we now have a working version that supports FXML. You'll have to download and build the latest jfxtras-lab bits from github, here.
Here is an FXML snippet showing how to define a Radial gauge in FXML. This matches Gerrit's blog, showing the same settings using Java code, here.
<Radial fx:id="radialGauge" prefWidth="280" prefHeight="280" title="Temperature" >
<unit>°C</unit>
<lcdDecimals>2</lcdDecimals>
<frameDesign>STEEL</frameDesign>
<backgroundDesign>DARK_GRAY</backgroundDesign>
<lcdDesign>STANDARD_GREEN</lcdDesign>
<lcdDecimals>2</lcdDecimals>
<lcdValueFont>LCD</lcdValueFont>
<pointerType>TYPE14</pointerType>
<valueColor>RED</valueColor>
<knobDesign>METAL</knobDesign>
<knobColor>SILVER</knobColor>
<sections>
<Section start="0" stop="37" color="lime"/>
<Section start="37" stop="60" color="yellow"/>
<Section start="60" stop="75" color="orange"/>
</sections>
<sectionsVisible>true</sectionsVisible>
<areas>
<Section start="75" stop="100" color="red"/>
</areas>
<areasVisible>true</areasVisible>
<markers>
<Marker value="30" color="magenta"/>
<Marker value="75" color="aquamarine"/>
</markers>
<markersVisible>true</markersVisible>
<threshold>40</threshold>
<thresholdVisible>true</thresholdVisible>
<glowVisible>true</glowVisible>
<glowOn>true</glowOn>
<trendVisible>true</trendVisible>
<trend>RISING</trend>
<userLedVisible>true</userLedVisible>
<bargraph>true</bargraph>
<radialRange>RADIAL_300</radialRange>
<GridPane.rowIndex>0</GridPane.rowIndex>
<GridPane.columnIndex>0</GridPane.columnIndex>
<GridPane.halignment>CENTER</GridPane.halignment>
<GridPane.valignment>CENTER</GridPane.valignment>
</Radial>
This produced the following display:
In FXML, you create a Java controller class. For this simple example, in the controller class, Gauge.java, I created a JavaFX Timeline that iterates from the minimum to the maximum value over 10 seconds, alternating with rising and falling values. The actual Radial Gauge is represented by the "radialGauge" member of the controller that is annotated with @FXML. This allows the FXML system to match the actual JavaFX Radial Control instance to the controller member variable based on the FXML"fx:id" attribute. The initialize method of the controller class is called once the FXML system has processed the XML and created all the JavaFX Nodes.
The main JavaFX application is contained in the class SteelFX and it loads the FXML file then assigns it to the JavaFX Scene.
The complete code is here:
Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.
Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
Check out the Codetown Jobs group.
The 19th annual QCon London conference took place at the The Queen Elizabeth II Conference Centre in London, England. This three-day event, organized by C4Media, consists of presentations by expert practitioners. Day Two, scheduled on April 8th, 2025, included a keynote address by Savannah Kunovsky and presentations from five conference tracks.
By Michael RedlichGeorge Mao explains Capital One's serverless-first approach, driven by efficiency and regulatory needs. He shares valuable lessons on CI/CD, concurrency, and cost management, along with actionable best practices for development (SDKs, runtimes), deployment (packaging, ARM), and observability for senior software developers and architects.
By George MaoEdera has announced the general availability of Edera Protect 1.0, a Kubernetes security solution designed to enhance container isolation and address longstanding security challenges in cloud-native environments.
By Craig RisiAs companies grow, investing in custom developer tools may become necessary. Initially, standard tools suffice, but as companies scale in engineers, maturity, and complexity, industry tools may no longer meet needs. Inflection points, such as a crisis, hyper-growth, or reaching a new market, often trigger investments, providing opportunities for improving productivity and operational excellence.
By Ben LindersGoogle's Gemini models are set to revolutionize on-premises AI with their upcoming launch on Google Distributed Cloud (GDC) in Q3 2025. Partnering with NVIDIA, organizations can harness advanced AI while maintaining strict compliance and data residency. With flexible infrastructure and secure environments, Gemini enables real-time insights for data-driven decision-making across industries.
By Steef-Jan Wiggers
© 2025 Created by Michael Levin.
Powered by
You need to be a member of Codetown to add comments!
Join Codetown