JNI

i've been trying 2d distance joint working in unity. want free rotation both body joint , connected body, need mass , other constraints adhered to, such fixing rigidbody's position. i've tryed days now, no luck configuring joint type. tryed verlet constraint using: float xdistance = hinge.transform.position.x - target.transform.position.x; float ydistance = hinge.transform.position.y - target.transform.position.y; float newdistance = mathf.sqrt( xdistance * xdistance + ydistance * ydistance ); float con = ( newdistance - maxdistance) / newdistance; vector3 movetarget = new vector3( xdistance * 0.5f * con , ydistance * 0.5f * con, 0.0f ); hinge.rigidbody.moveposition( hinge.transform.position - movetarget ); target.rigidbody.moveposition( target.transform.position + movetarget ); but doesn't take account mass/force or fixtures. can see here want movement on x/y , rotation on z. help? i know isn't answer, add comment button not there. i'm unit...

can explain me difference between vector , linked list adt in c programming language context. thanks. well, in c, there no "vector" , "list" data types available directly in c++ std library. in terms of "abstract data type", vector considered represent contiguous storage, , linked list considered represented individual cells linked together. vectors provide fast constant time random-access read , write operations, inserting , deleting vector elements take linear time. lists have linear lookup performance find element read , write, given element location, have constant time insertion , deletion. can add items start , end of list in constant time (if adt implementation caches location of last element in list).

i bit confused. implemented own usercontrol , want control discover components (like binding source) hosted in same control @ design time. code this: private void findcomponentbyname(string aname) { foreach(component component in this.container.components) { if (component.tostring()==aname) { dosomething(); break; } } } this code not working either @ design time or run time container null. if run code in form not in usercontrol private component findcomponentbyname(string aname) { component result = null; foreach (component component in this.components.components) { if (component.tostring() == aname) { result = component; break; } } return result; } it works, components not null , man...

i trying make fluid layout app , having trouble using css height percentages. using horizontal size of window specify height % when want getting percentage vertical size of window. possible or out of luck? width: x%; height: y%; x , y being percentage want element be. both being determined horizontal size of window, , want each use it's respective axis. if use javascript update absolute height of parent node, height % begins mean something. playing around, p or div first generation child of body ignores css height%; wrap in absolute height. if don't know height before hand, use onload js function set it.

when using treeview component in .net, of left tree. how can of right tree (windows native look) .net treeview? what want "triangle" node handles , blue "bubble" selection square. you need p/invoke call setwindowtheme passing window handle of tree , use "explorer" theme. paste following code new class in project, compile, , use custom control instead of built-in treeview control. c#: public class nativetreeview : system.windows.forms.treeview { [dllimport("uxtheme.dll", charset = charset.unicode)] private extern static int setwindowtheme(intptr hwnd, string pszsubappname, string pszsubidlist); protected override void createhandle() { base.createhandle(); setwindowtheme(this.handle, "explorer", null); } } vb.net: public class nativetreeview : inherits treeview private declare unicode function setwindowtheme lib "uxtheme...

i'm having torrid time installing apache2::request on centos 5.5. apache standard 1 came centos. i'm installing libapreq2-2.13 , lot of dependencies didn't exist. far had do: yum install httpd-devel # apxs i did: perl makefile.pl --with-apache2-apxs=/usr/sbin/apxs make the make step told me needed: extutils-xsbuilder , parse-recdescent, duly installed. running make again gave compiler error: /home/xx/installers/libapreq2-2.13/glue/perl/xsbuilder/apreq_xs_postperl.h:22:34: error: modperl_perl_unembed.h: no such file or directory /home/xx/installers/libapreq2-2.13/glue/perl/xsbuilder/apreq_xs_postperl.h:25:33: error: modperl_common_util.h: no such file or directory in file included apache2.xs:45: /home/xx/installers/libapreq2-2.13/glue/perl/xsbuilder/apr/request/apache2/apr__request__apache2.h:1:22: error: mod_perl.h: no such file or directory can tell me package i'm missing? there not method of installing common package "just works" (tm...

i have columns may contain data if user wants provide it. example | email | first name | last name | email - required column set not null - default: none first name - not required column set null - default: null last name - not required column set null - default: null in phpmyadmin when creating/editing column; has option saying default: drop down showing none | defined | null | current timestamp because first name | last name optional , not required should choose default null or maybe none? which best , why please? i know there many discussions on not find answered question; more in regards allowing null or not null, question default value. you should set them default:null if user doesn't provide info fields, should null obviously.