Continuing to publish my stock of more or less experimental Vaadin components. Here is the “ImageFilter”. It was originally an IT Mill Toolkit component, but I rewrote it to support stacking of filters. This version also uses (a lot of) filters from the excellent
JH Labs Java image filter package .
Here is how you would use the (server-side) image filter component:
// Load an image from a public URL and cache it. Caching is useful if
// you revert and re-apply the filters.
Image image = new Image(
"http://www.streamhead.com/wp-content/uploads/2010/01/vaadin.png",
true);
mainWindow.addComponent(image);
// Create transparent rounded corners
op = FilterOperation
.getByName(FilterOperation.ROUNDEDCORNERS);
((RoundedCornersFilter) op.getFilter()).setCornerRadius(cornerRadius);
image.addOperation(op);
// Add a drop shadow using default values
image.addOperation(FilterOperation.getByName(FilterOperation.DROPSHADOW));
// Remember to apply the filter stack
image.applyOperations();
Attached the Vaadin add-on jar. Remember to download the Filters.jar from
JH Labs also.
com.vaadin.event.ListenerMethod$MethodException
Cause: java.lang.ClassCastException: com.jhlabs.image.BrushedMetalFilter cannot be cast to com.jhlabs.image.AbstractBufferedImageOp
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:507)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1106)
at com.vaadin.ui.AbstractField.fireValueChange(AbstractField.java:864)
at com.vaadin.ui.AbstractField.setValue(AbstractField.java:514)
at com.vaadin.ui.AbstractSelect.setValue(AbstractSelect.java:640)
at com.vaadin.ui.AbstractSelect.changeVariables(AbstractSelect.java:449)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1058)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:559)
at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:260)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:438)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: com.jhlabs.image.BrushedMetalFilter cannot be cast to com.jhlabs.image.AbstractBufferedImageOp
at org.vaadin.imagefilter.FilterOperation.createBufferedImageOp(FilterOperation.java:217)
at org.vaadin.imagefilter.FilterOperation.getByName(FilterOperation.java:235)
at org.vaadin.imagefilter.ImageSampleApplication$2.valueChange(ImageSampleApplication.java:153)
at sun.reflect.GeneratedMethodAccessor170.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:487)
... 27 more
Sorry about that. Unfortunately, not all filters in the JH Labs filter package are implemented the same way. Tried to filter out all “incompatible” filters, but you found one.
I deployed a new demo, but the add-on jar still lists the incompatible filter. So be careful out there.
This is an excellent widget for image manipulation but If you just need a light-weight image scaling at the client-side you might consider using the ImageScaler add-on instead. See
http://vaadin.com/directory#addon/130
