I am trying to find a chart and plotting api that can be used in GWT using java, not javascript. The only problem I am having is the ones I have found require an internet connection which where this code will go cannot have an internet connection. Does any one know of such an API? Here are that ones that I found, but again can't use.
https://code.google.com/p/charts4j I know this one requires a connection.
http://code.google.com/p/gwt-google-apis/wiki/VisualizationGettingStarted
Not 100% sure on this one. If anyone has used it and can let me know if it requires a connection let me know. Also if anyone know how to get java swing to work in GWT that would be awesome.
Thank you
I just finished a little presentation on that topic. In there, I'm taking a short and somewhat subjective look at:
clientsidegchart
gflot
dojox.charting
Ico (and other Raphael based libs)
GXT charts
Smart GWT HTML5 Charts
FusionCharts
amCharts JavaScript Charts
Google Chart Tools API
JFreeChart (and other server side libs)
Only the last two of them require an active internet connection.
Here's the link to a PDF snapshot of the presentation: https://docs.google.com/open?id=0B0oR9hvG2VjoRDZZR20zYjVLalU
Client-side GChart. All in your app - no loading visualizations from external servers.
This is another open source api for charts in GWT hosted on http://code.google.com/p/gwt-rcharts/ you may find it useful. The API works on SVG/VML specification. You may find it quite easy to implement and use. You may find the demo at http://gwt-rcharts.appspot.com/
Related
I want to display data queried from GAE datastore in a nice way (graphs, etc.)
What is the best way to do it?
As I'm already working with GAE, perhaps there is a google API for that? The only thing I found online is Chart.js but I need to channel the JS into java which seems complicated.
Any advise will be welcome, Thanks!
I think a better way is to do the charts from the browser not the server. Just pass your data to the js and use google charts to display them. There are tons of examples and a playground for google charts.
GWT is a natural web front end for GAE applications---the Eclipse Google plugin integrates GWT with GAE, and the GWT tutorial includes a section on GAE. Several charting libraries are available, for example, http://code.google.com/p/gwt-google-apis/wiki/VisualizationGettingStarted. Moreover you can build your own in HTML5 with the GWT Canvas.
Good afternoon.
I hasten to add that I am new to developing for Android. I am writing a geolocation service (application).
Standard elements of the user who provides Google does not suit me. In many of the Internet once faced with information which says that you can write a user interface for Android using CSS and html.
After reading a lot of information on this topic, I realized that Most developers tend to use frameworks (PhoneGap. ..). But this approach does not suit me, for two reasons:
javascript - it is used everywhere, and I do not know
This absence of adequate (understandable) documentation or guides for frameworks.
It is for these reasons that I'm wondering whether it is possible to write the user interface using html and CSS, and all the features in Java without using frameworks.
As communication between fallback interface and native code, even with the assistance of javascript, but without the use of frameworks.
P.S. I am not good in English - I hope you have understood the point of my question. I hope for your help.
Normally an Android app defines UI in Android-specific XML and the code is in Java or, if really necessary, C/C++.
Probably you could use a WebView in your Android application which will display an html page from your assets directory.
Such html page can have javascript in it which will invoke some hooks in your code. It's described in the book The Busy Coder's Guide to Advanced Android Development Chapter 1, I believe
yes you can.
your html+css will all be in a webview and there're elements like the webview client that can communicate with what's inside the webview.
But I would like to leave you with a warning:
Every single web based app IS slower and with a poorer interface than proper native apps. Also, without the use of a framework you still will have to know a good portion of the native stuff.
I just had an idea for a cool website, but it would require an application that is fairly similar to the Google Maps interactive map. I was wondering what it was made in?
Is it a Java applet or a Flash application? Or something else?
Thanks a lot
Javascript. Lots and lots of javascript, with JSON for loading new data without refreshing the entire page.
If you'd like to know more, there's quite a community revolving around Greasemonkey that specialize in extending/reverse engineering the google maps codebase.
Another option for your mapping app: Program it it Java building off NASA's free WorldWind geospatial API. You could release it either as a standalone app, or as a JApplet that runs within browsers. The latter simplifies distribution and versioning.
Google API is Javascript. It is also available in Flash.
Bing map is using the same sytem and it is available in javascript or silverlight.
You may also be interested in openstreetmap (free alternative).
If you want to build a tile system from the ground, the easier is to use flash. You will avoid cross browser issues, and easely target large audiance. (I made one long time ago before gmap was out).
If your application require a map, you can use either Map API and build your application on top of it. Be aware that some kind of application and some uses require a licence fee and the entry ticket is quite high ($10k for gmap).
For the client side they are using the Google Closure Library, with a lot of extra javascript on top.
Rolling Thunder has had the flyby capability for many years. You load a gpx file then you can fly over or just slightly above group and can control the rate you fly and can pause and look around. It works on windows or the Mac OSX. You can find the Windows version at http://www.myuniportal.com/download.html Download the Map login version and then open a Map child window the select the foot button on the Map child window. You download a gpx file then press play and it will start at one end of the trail and fly over it.
I use AppEngine to host an Eclipse update site. I would like to keep track of the number of downloads of each version over time. Searching for ".*plugins.*jar" in the AppEngine access logs gives me a rough idea but the logs only go back a couple of months.
Is there any easy library which I can use to graph my downloads? I'm sure I could roll my own but I would like to have pretty graphs and feel like this may be a problem which has already been solved.
I don't know any libraries that would do the tracking for you on downloads on GAE. But if you decide to log the downloads yourself I would suggest using Google Chart Tools to visualize the data. It's really easy to build really nice looking charts. I especially like the playground where you can quickly try different charts.
I have implemented some code which met my requirements. I haven't packaged it nicely but you can start by looking at these files:
https://github.com/mchr3k/org.intrace/blob/master/intrace.appengine/war/downloads.jsp
https://github.com/mchr3k/org.intrace/blob/master/intrace.appengine/src/org/gaecounter/CountDownloadsFilter.java
https://github.com/mchr3k/org.intrace/blob/master/intrace.appengine/src/org/gaecounter/data/Counter.java
https://github.com/mchr3k/org.intrace/blob/master/intrace.appengine/war/WEB-INF/web.xml
I need to develop some jira gadget.
The gadget must have a chart and the possibility to insert external data and diplay it in the chart.
I have been trying the tutorial on atlassian documentation but I don't see any instruction on how to insert charts and how to do it, I think are made with JQuery (if it's correct, there are sample to use? I'm not really in to JQuery). Another problem that I found, is that there is no much explenation on how to get data from Jira (directly). I have seen the "jira api" (all the java interfaces) but I couldn't really get them work.
Anybody that know some better tutorial, gadget source example or that can help me on getting started?
Thanks.
I agree, developing JIRA gadgets with charts is harder than it should be. I have spent some time recently creating a plugin for a client that uses the JIRA system gadgets with some changes and it has been too much work. The charts in JIRA gadgets are created using JFreeChart.
If you can use an external visualization library such as Google Visualization then this example may help: https://labs.atlassian.com/wiki/display/JUA/JIRA+User+Activity
Change the pom.xml to refer to JIRA 4.2 at the bottom in two places and it compiles fine using the usual Atlassian PDK.
~Matt