JFreeChart – Tutorial JFreeChart makes it easy for developers to display professional quality charts in their applications jcommonjar. The JFreeChart Class Library. Version REFERENCE DOCUMENTATION. Written by David Gilbert. June 14, c , Simba Management. The JFreeChart Class Library. Version Developer Guide. Written by David Gilbert. April 28, c , Object Refinery Limited. All rights.
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Great new opt-out feature from Google: Here’s a great story for anyone who’s ever kicked a rugby ball The Swiss are mocked and rightly so on Degeloper Daily Show for their recent vote to ban minarets. It is their country, and their vote, I won’t argue with that.
But it reveals to the whole world an ugly intolerance that Swiss people will have to work hard to shake. It’s Jon Stewartnot John Stewart. I don’t usually do that. And names are important. You know who you are. My resolutions for Hfreechart a new language. Or just drink some very fine beer with some very fine friends; Make more JFreeChart releases, and find a more secure source of funding for the project; Put the interests of my family above all else. Happy New Year everyone!
JFreeChart is off to a great start in with two exciting new developments that I’m desperately trying to find the time to integrate into the JFreeChart sources. First, Gerrit Grunwald has been doing some stunning work on amongst other things a gauge component for Swing: Martin kindly approached me about integrating this library within JFreeChartand I have started sifting through the code.
But you don’t have to wait, the code is available now So, yesterday was the 10 year anniversary of the first release of JFreeChartand it slipped by without me noticing! I knew it was coming up, and even checked the exact date a few weeks back, but then on the day I had so much else to do. Life is like that at the moment. Anyway, tonight as I walked home from work I decided a small celebration was in order, so I bought a bottle of New Zealand sunshine and If you don’t feel sick watching this, you’re not human anymore: If you don’t smile watching this, you’re not human anymore: JFreeChart doesn’t have support for RadialGradientPaint out-of-the-box yetbut it can be done if you follow the instructions in this post note that reflection is being used in the code so that it will continue to compile and run on Java versions earlier than 1.
Here is the source code for the demo above requires the patches in the deveolper post referenced above to be applied to JFreeChart: I finally found the time to clean up and re-enable the JFreeChart forum following a spamming incident deve,oper July. Eeveloper spam muppets thought it would be a good idea to post 50, entries in the forum, my web-hosting company rightly thought it was not such a good idea. Now it is fixed.
Upgrade to JFreechart 1.0.17
The 61st public release of JFreeChart is now available for download. This release contains support for multiple and logarithmic axes with PolarPlot, optional drop-shadows in plot rendering, fitting polynomial functions to a data series, some performance improvements in the TimeSeriesCollection class, mouse wheel rotation of pie charts, improved Maven support and numerous bug fixes.
Over the coming weeks, I aim to post a few entries highlighting some of the new features in JFreeChart 1. I hope also that the examples there will be source code will encourage developers to experiment with the multitude of settings in JFreeChart to customise the appearance of their charts.
It is a developdr and fair criticism that the default “look” in JFreeChart is dated some even say ugly but they are not very polite I’ll start with the new support for Java’s RadialGradientPaint in pie charts, which gives an opportunity jfreechaft developers to liven up the appearance of these charts with only a small amount of additional effort you need Java 6 or later for this to work, since RadialGradientPaint does not exist in earlier Java runtimes.
JFreeChart – Tutorial
You can jfreechagt call the existing setSectionPaint method of the PiePlot class and pass it a RadialGradientPaint instance, as the following example illustrates:. Another key feature in the JFreeChart 1. Jfreecharh effect of this is quite subtle, but noticeable if you compare two charts directly, one with the shadows and one without:.
I had resisted adding this feature in the past, because it means dropping down to bit-map level operations, and the rest of JFreeChart is based purely on vector primitives Jfrechart this feature will incur some overhead in memory usage, but is very simple to switch on – simply add the following line near the start of your application before any charts are created:.
There are other more direct ways as well, for example see the setShadowGenerator method in the XYPlot class. I’ll be there on Thursday afternoon and evening. Everyone has been telling me how good it is, so finally I have decided to try it out.
People have also finally given up trying to convince me to use Maven for the JFreeChart builds so, at least for this dev version, I’ve started using Maven.
In fact, this is helping me out quite a bit, because I switch between a few different machines, and the excellent out-of-the-box Maven support in NetBeans means I can just open my JFreeChart project via the pom file and start working. Git integration in NetBeans is really smooth too, again out-of-the-box which is something I really appreciate. NetBeans has finally converted me – after many years of using Eclipse, I’ve stopped installing it. Anyway, I looked it up and found this source: The dataset, of course, may not provide a good representation of global usage it is based on visitor logs for W3C only I’m always on the lookout for interesting data sets to use for the JFreeChart demo collection, so I created this chart based on a subset of the browser data: I like this chart, and will most likely try to keep it up-to-date in the coming months.
If I can find some data that splits out desktop vs mobile browsing, that would be interesting as well. In the meantime, I’ll go and give Chrome another try. A new release of JFreeChart is now available for download. This release contains support for non-visible series in XYBarRenderer, minor gridlines in PolarPlot, new legend item ordering options, chart editor enhancements, updates to StandardDialScale, localisation files for Japanese, refactored parameter checks and a fix for a minor security flaw in the DisplayChart class, detected and reported by OSI Security: Here is a sample chart created by JFreeChart: Please help to spread the word about JFreeChart blogs, tweets and word-of-mouth are all appreciatedand if you are using JFreeChart at your company please consider supporting our project by purchasing the JFreeChart Developer Guide and demo source code.
This also didn’t take all that long, and after connecting it up to JFreeChart here’s the result click here for the “live” SVG version:. This format is a bit more useful coming from Java than the output from CanvasGraphics2D because SVG has built-in support for scaling, so the quality of the image is retained as it is scaled in the browser or anywhere elsewhich is nicer than what you get from PNG or other image formats:.
It is working well with JFreeChart, but I have a little more work to do on it there is no image support so far, and the clipping and transforming code also needs some work. Once it is complete, I plan to attach a proprietary gasp licence to it and include it as a small bonus to developers that purchase the JFreeChart Developer Guide There are now 19 projects listed, some of them look quite decent.
Just now I added the year of the most recent release in square brackets please let me know if I made any errors in that, the intent was to help identify projects that are still alive: I can certainly appreciate the amount of effort that has gone into coding those things.
Well, I’ve taken this thing about as far as I can without getting some real-world feedback on it, so I’ve packaged it up in a new project JFreeGraphics2D and released it. It’s taken slightly longer than I planned, because along the way I wondered what it would take to do a PDFGraphics2D implementation and somehow could not put it down. Please try it out and send your feedback. Initially the proprietary licenses will be bundled with the JFreeChart Developer Guide and Demo Source Code, to encourage companies to support our work more than just in spirit.
The absolute numbers are subject to interpretation, obviously, but it’s pretty clear what is hot at the moment for client-side developers: For the last couple of days, my Galaxy Nexus S has been going to sleep and not waking up again restarting required either removing the battery, or plugging in and removing the charger, which is not so convenient. Then I noticed that when the phone is on, I cannot switch it off.
The point of this post is just to say, this video has provided a tolerable workaround to the problem so thanks to Ryan Lowe for going to the trouble of posting it.
It’s my plan to release JFreeChart 1. In the two months since 1. Previously that has required the use of Apache’s Batik and Bruno Lowagie’s iTextboth really great libraries but dependencies that carry a certain “weight” with them. While you’re here, let me draw attention to another small feature coming in JFreeChart 1. Here is a simple example where the label can include a super-script there’s more you can do with attributed strings, but this is a good use-case: I don’t know why I didn’t add this many years ago And I’ll show you the rest of the chart later, which is quite an interesting visualisation of the amount of water used by the top 20 water-consuming countries.
I’m in the process of updating the JFreeChart demo charts to use more real data]. Today I released three projects simultaneously.
1.0.16 First up, JFreeChart 1. This release includes some new features axis label improvements, simplified ChartFactory methods, utility methods to interpolate y-values in XYDataset s, CategoryAxis URL guixe in image maps that were added in the two months since the previous release, a few important bug fixes, and a bit of clean-up that’s possible now that we’ve dropped support for JDKs 1.
The good news is that, during September and October the licenses will be included free-of-charge with all purchases of the JFreeChart Developer Guide.
So buy the guide, and help keep JFree alive! Rather than the usual screenshot, here’s the SVG output for one of the sample charts: Projected Values – Test Series 1 Series 2 Nov Jan Mar May Jul Sep Date 92 93 94 95 96 97 98 99 Index Projection If the chart doesn’t render well for you, please let me know the jfreecuart and system you are using, because I’m interested.
Orson Charts features a very nice guied for use in Swing applications providing zooming and full degree rotation of the charts in any direction. I encourage you to download the free evaluation copy and run the demo programs to see this in action.
Orson Charts is not open source. I want this project to be self-sustaining and it’s my judgement that charging money for it is the best way to fund ongoing development. Please download the free evaluation copy of Orson Charts, try out the demo application, look through the API, send me your feedback This release adds a notify flag to all datasets, key validation for the time series dataset, area fills for the XYSplineRenderer, a new axis jfreeechart formatter, improvements deceloper rotated text code, and numerous bug fixes.