Octave Gui

8/10/2019 Octave Gui

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The Octave GUI



What makes a good GUI?

● Requirements for a GUI are summarized in theEN ISO !"# standard$ %hich inc&udes'

● Suita(i&it)

● *ust (e se&f+descri,tive

● -ccessi(i&it) .different means to ,erform a certaintask/

● -da,ta(i&it)

● *ust meet the user0s e1,ectations

23 There is no absolute measure to determine %hether a GUI is %e&&+done or not4 Whether thedesign of a GUI is good or not heavi&) de,ends onthe target audience4

Taken from' htt,'55%%%4ss%4com4au5



6esign goa&s for the Octave GUI

● 7rovide an visua& environment that is simi&ar to that of*-T8-94 :ee, care of menu structure$ shortcuts$ namingconventions4

● E1tend the visua& environment %hereever it makes sense todo that .for e1am,&e' History search/



What is ;t?

● ;t is an application development framework

● -n a,,&ication deve&o,ment frame%ork is aset of c&asses that he&,s deve&o,ers to createfeature+rich a,,&ications faster () ,rovidingcommon functiona&it) on a ver) a(stract &eve&

● It is common to use a,,&ication deve&o,ment

frame%orks in soft%are deve&o,ment toda)● ;t is free soft%are &icensed under the G78



6esign features of ;t

● <er) high a(straction &eve&

● -im for ,&atform+inde,endenc)

●

Suited for high+,erformance$ mu&timediaa,,&ications

● Eas) to &earn$ =ust a fe% re,etitive conce,ts.>&earned it once$ &earned it a&&/

● <er) good documentation$ integrated into the;t@reator I6E



9asic @once,ts' ;O(=ect

● *uch &ike in Aava$ ;t introduces a (asic o(=ectc&asses for a&& non+trivia& data structures';O(=ect

● 9) defau&t$ each instance of a ;O(=ect isunique$ it cannot (e co,ied

● Each ;O(=ect can (enefit from a &anguage

e1tension ;t ,rovides$ ca&&ed signals and slots



9asic @once,ts' Signa&s and

S&ots● In order to ,rovide &oose cou,&ing of o(=ects .that0s adesira(&e feature in o(=ect+oriented ,rogramming/$;O(=ect can communicate via signa&s and s&ots

●

Each ;O(=ect can emit signals, ho%ever$ it does nothave an) kno%&edge a(out %ho &istens to the signa&and if it has an effect at a&&B >Cire and forget

●

Each ;O(=ect can offer s&ots4 S&ots can (econnected and disconnected to signa&s at runtime$ %ithout the need of te&&ing the ;O(=ects a(out that



9asic @once,ts' ;Widgets● ;Widget derives from ;O(=ect

● Widget 2 ><isua& Gagdet

● ;Widgets are usua&&) used for dis,&a)ing visua& e&ements4 -&&visua& e&ements have to have ;Widget as a (ase c&ass

● ;Widgets can (e >stacked one into another () e1,&icit&)stating a hierarch) via the parent +,arameter in the ;Widget+constructor

● Once a ,arent has (een assigned to a ;Widget$ the ,arent

cares for c&eaning u, memor) .ie4 de&eting chi&d %idgets %i&&&ead to a segfau&t/

● ;Widget %ithout a ,arent are to,+&eve&+%idgets4 The user hasto take for c&eaning u, memor)4



9asic @once,ts' Neat&ess

integration of O,enG8● With ;G8Widget$ ;tintegrates O,enG8neat&ess&)4 ;t canmanage severa&O,enG8 dis,&a)s at

the same time4



9asic @once,ts' 8a)outing and

St)&ing● ;Widgets can (e a&igned in horizonta& andvertica& &a)outs

● The actua& size size is determined () the size,o&ic) of each ;Widget

● 8a)outs can (e cascaded to ,rovide an) %idget &a)out that is desired

● ;Widgets can (e st)&ed &ike %e(,ages %ithregu&ar @SS



9asic @once,ts' ;t 6eve& Too&s

● qmake' Reads a D4,ro+,ro=ect fi&e and generates makefi&es forvarious >targets .,&atforms/4 qmake is a(&e to generate ,ro=ect fi&esfor other I6Es$ &ike for e1am,&e <isua& Studio4

● moc' *eta+O(=ect+@om,i&er4 This too& is used to ,arse source fi&es

containing ;O(=ects in order to generate g&ue code for the signa&sand s&ots s)stem4

● uic' User+Interface+@om,i&er4 Reads *8+user interface definitionsand creates @FF source code4

● &u,date' 7art of ;t0s &anguage trans&ation s)stem4 U,dates the&anguage fi&es () ,arsing the sources for the tr .44/ macro4

● &re&ease' @om,i&es &anguage fi&es that can (e shi,,ed %ith and&oaded () ;t a,,&ications4



*inima& ;t 9ui&d 7rocess

qmake

,ro=ect4,ro

uic

%idget4ui

ui%idget4hmoc

%idget4cc moc%idget4cc %idget4h

Target

*akefi&esming%H!+make

make

nmake

9inaries

7&atform+inde,endent

7&atform+de,endent



6esigning a GUI %ith ;t

● ;t offers a WSIWG editor for designing GUIs' ;t6esigner

● ;t offers a ,rett) neat s)stem for &a)outs and size ,o&icies

● Once a GUI has (een designed$ it %i&& store the resu&t in an

*8+format fi&e .4ui+fi&e/● The uic+too& generates header fi&es$ these %i&& contain a %idget

c&ass that can (e su(c&assed and e1tended %ith @FF code

●

23 Combining the best of two worlds' Code generation fordesigning ,ur,oses$ writing code in order to %rite detai&ed GUI&ogic and im,&ementing e1tended features423 @ode generation and %riting code do not interfere4



;t6esigner



8oca&ization

● ;t has (ui&t+in &oca&ization su,,ort4 Within ;t$ a&& userinterface strings have to (e surrounded %ith tr(...)

● With the qu,date+command the &anguage in,ut fi&es forthe s,ecified &anguages %i&& (e u,dated4

● ;t8inguist can (e used for trans&ators to do trans&ation %ithin an eas) to &earn I6E4

● With qre&ease the &anguage fi&es get com,i&ed into

distri(uta(&e >&anguage ,ackages that can (e &oaded ();t a,,&ications4

There has a&read) (een a fe% trans&ations for the GNUOctave GUI4



GNU Octave and thread+safet)

● 7ro(&em' GNU Octave itse&f is not thread+safe$ (uta,,&ications %ith GUIs have to (e mu&tithreaded in orderto kee, the GUI res,onsive4

● So&ution #' *ake GNU Octave threadsafe4

F Often$ GNU Octave can (enefit heavi&) from s)stems that are a(&e toe1ecute mu&ti,&e threads in ,ara&&e& in hard%are

F -,,&)ing a GUI %ou&d (e eas)

+ Near&) im,ossi(&e to achieve due to &ots of g&o(a& state in GNU Octave

+ 7erformance decrease for tasks that cannot (e ,ara&&e&ized or hard%arethat does not su,,ort mu&ti,&e threads in hard%are



GNU Octave and thread+safet)

● 7ro(&em' GNU Octave itse&f is not thread+safe$ (uta,,&ications %ith GUIs have to (e mu&tithreaded in orderto kee, the GUI res,onsive4

● So&ution !' Seria&ize communication (et%een GNUOctave and other threads4

F *inima&+invasive a,,roach$ no modification of former GNU Octave code

F Eas) to im,&ement and understand

+ 7erformance decrease for a&& tasks$ since additiona& time in the GNUOctave thread %i&& (e s,ent4 Possible solution → se the !" forinteractive research and code development. #nce this has been done, usethe !$ #ctave C%" version to run your scripts on a larger scale.



Event+(ased communication



Events im,&emented %ithO(server+7attern

Source' htt,'55en4%iki,edia4org5%iki5Ci&e'O(server4svg



Integrating the command &ine

● Cormer GUIs im,&emented a ,i,e+(asedcommunication () &aunching GNU Octave asa su(,rocess4

6isadvantages'

● The GUI has to ,arse GNU Octave0s out,ut and generatein,ut B s&o% and error+,rone

● The GUI has no access to interna& dataB &imited functiona&it)

● The GUI has to reim,&ement (asica&&) a&& functiona&it)that is a&read) given () read&ine



GNU Octave GUI0s a,,roach

● 9ased on code from :6E0s :onso&e' Cu&&termina& emu&ation4 On Windo%s' @onso&e!a,,roach4

● Theoretica&&)$ offers the same functiona&it) asGNU Octave run in a termina& %indo%$ %ith nocom,romises on functiona&it)

●

Aohn S%ensen first came u, %ith this idea inhis GT:F5;t #ctave&'.



6ifferent %a)s of running octave



Integrated Editor

● Using ;Scinti&&a! as as ,o%erfu& editor %idget

● ;Scinti&&a! is free soft%are &icensed under theG78

● Offers a&& the standard comfort of an editor'*arker &ines$ &ine num(ers$ code fo&ding$ current &inehigh&ighting$ s)nta1 high&ighting$ auto+indent$ code+com,&etion

● Cor further Information see'

htt,'55%%%4river(ankcom,uting4co4uk5soft%are5qscinti&&a5



6e(ugging Interface

● Neat&ess integration of GNU Octave0sde(ugger4 It is ,ossi(&e to set (reak,oints atthe margin in the editor4

● Ste,,ing through the code can (e done %iththe usua& C#J5C##5C#! and CK commands4

● Whi&e de(ugging$ it is ,ossi(&e to track the

current state of the %orks,ace4



Thank )ou for )our attentionL

Octave Gui

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