关于Matlab中GUI的Slider.docx

关于Matlab中GUI的Slider.docx

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关于Matlab中GUI的Slider

MATLABGUITutorial-Slider

28Oct2007QuanQuach118comments20,071views

Introduction

InthisMatlabGUItutorial,youwilllearnhowtocreateandusetheslidercomponent.Slidersareusefulcontrolsforchoosingavalueinarangeofvalues.Commonusesarevolumecontrols,seekersformovieandsoundfilesaswellascolorpickers.Anexampleofasliderisshownbelow.

ThistutorialiswrittenforthosewithlittleornoexperiencecreatingaMatlabGUI（GraphicalUserInterface）.Ifyou’renewtocreatingGUIsinMatlab,youshouldvisitthistutorialfirst.BasicknowledgeofMatlabisnotrequired,butrecommended.Matlabversion2007aisusedinwritingthistutorial.Bothearlierversionsandnewversionsshouldbecompatibleaswell（aslongasitisn’ttoooutdated）.Let’sgetstarted!

CreatetheVisualAspectoftheGUI

1.StartupMatlab,andtypeguideinthecommandline.

2.ChoosetocreateanewGUIusingthe“BlankGUI（Default）”option.

3.Clickon

andaddanEditTextcomponenttotheGUIfigure.Next,clickon

andaddaSlidercomponentontotheGUIfigure.

4.DoubleclicktheEditTextcomponenttobringupthePropertyInspector.ChangetheStringpropertyto0,andchangetheTagpropertytosliderValue_editTextasshowninthefigurebelow:

5.Next,let’smodifythepropertiesoftheSlidercomponent.FirstletssittheMinpropertyto0,andtheMaxpropertyto100.Next,changetheTagpropertytoslider1.

6.Here’swhatyourfigureshouldlooklikeafteryouaddthecomponentsandmodifythem.

7.Atthispoint,youalsomightwanttoaddsomeStaticTextcomponentstospecifytheminandmaxvaluesoftheslider.YoucanmodifytheirtextbydoubleclickingonthecomponentandchangingtheStringproperty.It’snotrequired,butIhighlyrecommendit.

8.SaveyourGUIwhereveryoupleasewithyourdesiredfilename.

WritingtheCodefortheGUI

Matlabautomaticallygeneratesan.mfiletogoalongwiththefigurethatyoujustputtogether.The.mfileiswhereweattachtheappropriatecodetothecallbackofeachcomponent.Forthepurposesofthistutorial,weareprimarilyconcernedonlywiththecallbackfunctions.Youdon’thavetoworryaboutanyoftheotherfunctiontypes.

1.Openupthe.mfilethatwasautomaticallygeneratedwhenyousavedyourGUI.IntheMatlabeditor,clickonthe

icon,whichwillbringupalistofthefunctionswithinthe.mfile.Selectslider1_Callback.

Addthefollowingcodetothefunction:

%obtainstheslidervaluefromtheslidercomponent

sliderValue=get（handles.slider1,'Value'）;

%putstheslidervalueintotheedittextcomponent

set（handles.slider_editText,'String',num2str（sliderValue））;

%Updatehandlesstructure

guidata（hObject,handles）;

2.Now,let’saddthefollowingcodetotheslider_editText_Callbackfunction:

3.%getthestringfortheeditTextcomponent

4.sliderValue=get（handles.slider_editText,'String'）;

5. 

6.%convertfromstringtonumberifpossible,otherwisereturnsempty

7.sliderValue=str2num（sliderValue）;

8. 

9.%ifuserinputssomethingisnotanumber,oriftheinputislessthan0

10.%orgreaterthan100,thentheslidervaluedefaultsto0

11.if（isempty（sliderValue）||sliderValue<0||sliderValue>100）

12.set（handles.slider1,'Value',0）;

13.set（handles.slider_editText,'String','0'）;

14.else

15.set（handles.slider1,'Value',sliderValue）;

end

16.Saveyourm-file!

RunandTesttheGUI

Nowthatwe’vecompletedboththevisualandcodeaspectsoftheGUI,itstimetoruntheGUItomakesureitworks.

1.Fromthem-fileeditor,youcanclickonthe

icontosaveandruntheGUI.Alternatively,fromtheGUIDEeditor,youcanclickonthe

tolaunchtheGUI.ThefollowingGUIshouldappearonceyouclicktheicon:

2.Now,trytoputindifferenttypesofinputstotesttheGUI.Anyinputthatisnotanumber,lessthanzero,orgreaterthan100shoulddefaulttheslidertoavalueofzero.

3.Andthat’sit.ThosearethebasicsofusingaSlidercomponent.YoucanexploretheotheroptionsthatthesliderhastoofferthroughthePropertyInspector.Forinstance,youcanusetheSliderSteppropertytocustomizehowfaryouwanttheslidertomovewhenyoupresstheleftandrightarrow,orwhenyouclickonthescrollbar.

Thisistheendofthetutorial.

Sourcefilescanbedownloadedhere.

118Responsesto“MATLABGUITutorial-Slider”

1.on05Dec2007at1:

10pm1Waqas

Thiswasveryhelpfull,thnx4helpingmeout!

2.on20Jan2008at4:

28pm2Alex

Thanks!

!

!

!

Amdoingcoursework-veryhelpful…

3.on30Jan2008at2:

44pm3Graham

Verynicemate,clearlypresentedandeasytofollow,10/10

4.on18Mar2008at3:

17am4Eman

ThanksforthegreattutorialsIhavebeenlivingonyourtutorialsforthepastfewdaysandtheyarehelpingmedrivethrough…Greatworkandeffort….

Ihavesomeinquiriesabouttheslider,

Iwouldliketohaveaminvaluethatisnotzeroontheslidersuchthattheextremeleftisa1forexample.InadditionIwouldliketoknowhowIcouldsettheinitialvalue/Positionoftheslider.

Thanksforyourhelp

5.on18Mar2008at5:

48pm5DanielSutoyo

HeyEman,thanksforthesupport…herearetheanswerstoyourinquiries

1.YoucanchangeminvalueofthesliderbygoingtoGUIbuilderanddoubleclickontheslidertohavethepropertiesmenushowup.ScrolltoMin,andchangethevalueform0to1.

2.Tosetinitialvalue,hereisonewaytodoit.PastethefollowingcodeintheSlider_OpeningFcn.Itbasicallysetsyourslidervalueandthetextboxtoaninitializedvaluethatyoudetermine.

initval=10;

set（handles.slider1,’Value’,initval）;

set（handles.slider_editText,’String’,num2str（initval））;

6.on20Mar2008at7:

13am6Eman

ThanksalotforyourhelpItsworkingFinenow

7.on22Mar2008at12:

22pm7rajo

thanks!

thesetutorialsarehelpful

iwouldliketousethematlabGUIfordrawingagraphofECGsignal（only50among500elementsofthedatashouldbedisplayedfirst）andtouseaslidersothatwhenuserclickthesliderotherpartsofgraphshouldbedisplayedjustinthesamewayweusethenormalslider.Asuserpressuppartofthesliderapagemovesupandviseversa.ihopeyouwillhelp

8.on25Mar2008at10:

12pm8Bravo

HowmultilinestatictextcanscrollusingsliderinGUI.Actuallyihaveabigoutputtoshowonstatictext,notfessibletodisplayonassignedplaceofSatictext.Scrollingrequiredhorizotallyandvertically.IrequiredtutorialasiamnewinMatlab.Thanksinadvance.

9.on01Apr2008at7:

47am9Yiannis

Niceworkthere!

Isthereanywayofdisplayingthecurrentvalueoftheslider,onit,orasideofit?

10.on09Apr2008at7:

16am10beaf

Yiannis==>Youcanaddanother“edittext”withaverylittlefontsize.

Then,youputitjustunderyoursliderandyourepeatthetutorialstepsto“connect”thesliderandthenew“edittext”.

sorryformyenglish

11.on17Apr2008at6:

37am11Paresh

NiceArticle

12.on12May2008at1:

32pm12Dushyant

extremelygoodandsimpletounderstandtutorials..notjustthisone…allofthem…

thankyou!

!

13.on11Jun2008at3:

54pm13forrest

Haveyoufoundawaytomakethesliderupdateconstantly?

Irealizethiswouldcreateloadsofcallbacks,butIfinditnecessaryinsomeinstances.I’vefoundnodocumentationtosupportthisfeature.

14.on17Jun2008at6:

28am14Martin

Realygoodworkyoudonehere.Helpsalot.

I’vegotaproblemandIwonderifyougotanideahowtosolveit.

I’musingasliderthatshouldcovertheareafrom0-63andI’monlyinterestedinintegers.I’veconnectedittoaneditasyoudescribed.

I’vefoundoutthatIshoulduse1/64assliderstepbutthepropertyinspectorolytakesthedecimalsandthatsgiveme1/64~0.016wichisn’tgoodenough.

Doseanybodyknowhowtosolvethis?

Thanks…

15.on17Jun2008at6:

52am15Martin

Sorryaboutmyunreadablewriting.

I’vefoundoutthatIshoulduse1/64assliderstepbutthepropertyinspectoronlytakesthreedecimalsandthatgivesme1/64~0.016wichisn’tgoodenough.

16.on18Jun2008at2:

22am16Albert

Yes,youhavetousedecimalfrom0to1whichis‘1/（max-min）’.Whatyoucandoisusewincalctodeterminewhatthestepisandcopyandpastetheanswerintothepropertyeditorforthesliderxandyvalues（xisforthedirectionbuttonsofthesliderandyisforthetrough）.Whenyouclickonit,itwillshowthefullvalue（0.015625）untilyouclickawaythenitwillprobableshowwhatyouareexperiencing.Thisisnotaproblem,itshouldstillworkfine.

Inthecallbackfortheslider,youmaywanttoensurethatyouaregettingintegersbyusingsomethinglikethefollowing:

IfyouhaveaneditboxcalledtextInputandaslidercalledtextInputSlider,

fortheslider

set（handles.textInputSlider,‘String’,floor（get（hObject,’Value’）））;

17.on18Jun2008at8:

18am17Martin

Thanks

18.on29Jun2008at8:

06am18AbdullahiMohammed

Hello,

Yourwebsitehelpedmealot.Idonotknowhowtosaythankyou.IhavereadquitealotoftextbooksonGUI.ButthefinalimplimentationoftheGUIhasnotbeenproperlyexplainedexceptyou.Lookingforwardtoreadmoreeducativeitemsfromyourwebsite.

19.on10Jul2008at7:

15pm19kaspi

soideclaredaglobalvariablecalled“wavelength1″inbothedittextandslidercallbacks.theniset“wavelength1=sliderValue”sothatthetwoarelinked.myproblemisthatwhenigotoenteravalueintheedittextandthenhitenteritdoesacarriagereturnratherthanchangingthepositionoftheslider.ifoundthatifienteravalueintheedittextandthenclicksomewhereelse,thesliderchangesposition.buthowcan