java - "Exception in thread "Animation Thread" error when using Processing in Eclipse -

-

i have created simple processing sketch in eclipse classes.eclipse says code contains no errors, warnings, fails @ runtime , console displays following errors:

exception in thread "animation thread" java.lang.nullpointerexception @ processing.core.papplet.ellipse(papplet.java:12174) @ assignment.tracking.display(tracking.java:15) @ assignment.assignment.draw(assignment.java:16) @ processing.core.papplet.handledraw(papplet.java:2386) @ processing.core.pgraphicsjava2d.requestdraw(pgraphicsjava2d.java:240) @ processing.core.papplet.run(papplet.java:2256) @ java.lang.thread.run(unknown source)

the code following:

package assignment;  import processing.core.*;    public class assignment extends papplet {       tracking tracking;       public void setup() {          size(500, 500);          tracking = new tracking();      }         public void draw() {          tracking.display();      }  }

and code tracking class is: 

    package assignment;     import processing.core.*;        public class tracking extends papplet     {       int test;        public tracking() {       test = 100;       }        void display(){           ellipse(test, test, test, test);       }     }

i believe have imported necessary processing .jar files. in advance help

it looks problem setup in assignment class, calls ellipse() tracking class. note assignment , tracking 2 different papplets. call size(500, 500) in assignment, tracking has no defined size.


Comments

Post a Comment

Popular posts from this blog

angularjs - Showing an empty as first option in select tag -

-
my app showing empty select field first entry. have read other solution given , tried still not working. my controller code is: .controller('usercreatecontroller', function(user,profile,auth) { alert("hello"); var vm = this; vm.type = 'create'; profile.all() //this service fetch profiles shown in select field .success(function(data){ vm.profile = data; }); vm.userdata.profile = vm.profile[0]; //here have set default value select field and html page is: <label class="col-sm-2 control-label">profile</label> <div class="col-sm-8"> <select ng-model="user.userdata.profile" ng-options="person._id person.profilename person in user.profile"> </select> </div> hierarchy of vm.profile { "_id": 46, "profile": objectid("5516498e95b84548156db754"), "isactive": true, "password": "$2...
Read more

qt - Change color of QGraphicsView rubber band -

-
i know it's possible change color of rubber band rectangle way: qrubberband rubberband = new qrubberband(qrubberband::rectangle, this); qpalette pal; pal.setbrush(qpalette::highlight, qbrush(qt::white)); rubberband->setpalette(pal); but here way achieve rubber band, rendered qgraphicsview when rubberbanddrag mode active? or in "global scope"? i'm sorry wrote question, i've looked solution long time, , nothing. few minutes after asking, found solution setting stylesheet. i'm sharing it. just go designer of qt creator, click on canvas (qgraphicsview). in "qwidget" part find "stylesheet", edit it, , put like: selection-background-color: rgba(255, 255, 255, 128); that's :-). thanks.
Read more

c++ - Print Preview in Qt -

-
i want preview page or want have print preview. preview window opening contents of qt window not comming in it. code print preview follows: void user::on_actionprintpreview_triggered() { qprinter printer(qprinter::highresolution); qprintpreviewdialog preview(&printer, this); connect(&preview, signal(paintrequested(qprinter *)), this, slot(print(qprinter *))); preview.exec(); } void user::print(qprinter *printer) { // print page qpainter painter(printer); int w = printer->pagerect().width(); int h = printer->pagerect().height(); qrect page(0, 0, w, h); qfont font = painter.font(); font.setpixelsize((w+h)/100); painter.setfont(font); painter.drawtext(page, qt::alignbottom | qt::alignright, qdatetime::currentdatetime(). tostring(qt::defaultlocaleshortdate)); page.adjust(w/20, h/20, -w/20, -h/20); } how can content of qt window in it. doing wrong. please m...
Read more