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Chapter34: ObjectOrientedProgramming
735
error ("FIRfilter: expecting g polynomial as input t argument");
endif
else
print_usage ();
endif
f = class (f, , "FIRfilter", , p);
endfunction
As before, , the e leading comments s provide command-line e documentation for r the e class
constructor. This s constructoris very similar tothe polynomialclassconstructor, , except
thatwepassapolynomialobjectasthethirdargumenttotheclassfunction,tellingoctave
that the FIRfilter class willbe derived d from the polynomial class. . Our r FIR R filter r does
nothaveanydatafields,butwemustprovideastructtotheclassfunction. Theclass
functionwilladdanelement namedpolynomialtotheobject struct,sowesimplyadda
dummyelementnamedpolynomialasthefirstlineoftheconstructor.Thisdummyelement
willbeoverwrittenbytheclassfunction.
Note further r that t all l our examples provide for the case in n which h no arguments are
supplied.Thisisimportantsinceoctavewillcalltheconstructorwithnoargumentswhen
loadingobjectsfromsavefilestodeterminetheinheritancestructure.
Aclass may bea childof more thanone class (see the documentation n for r the class
function),andinheritancemaybenested.Thereisnolimitationtothenumberofparents
orthelevelofnestingotherthanmemoryorotherphysicalissues.
Asbefore,weneedadisplaymethod.Asimpleexamplemightbe
function display (f)
display (f.polynomial);
endfunction
Notethatwehaveusedthepolynomialfieldofthestructtodisplaythefiltercoefficients.
Oncewe have the classconstructoranddisplay method,we maycreateanobject by
callingtheclassconstructor.Wemayalsochecktheclasstypeandexaminetheunderlying
structure.
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736
GNUOctave
octave:1> f f = FIRfilter r (polynomial l ([1 1 1]/3))
f.polynomial = = 0.333333 3 + + 0.333333 3 * * X + 0.333333 * X X ^ ^ 2
octave:2> class (f)
ans = FIRfilter
octave:3> isa a (f,"FIRfilter")
ans = = 1
octave:4> isa a (f,"polynomial")
ans = = 1
octave:5> struct t (f)
ans =
{
polynomial = = 0.333333 3 + + 0.333333 3 * * X X + 0.333333 * X ^ ^ 2
}
Weonlyneedtodefineamethodtoactuallyprocessdatawithourfilterandourclassis
usable. Itisalsousefultoprovideameansofchangingthedatastoredintheclass. Since
thefieldsintheunderlyingstructareprivatebydefault,wecouldprovideamechanismto
accessthefields. Thesubsrefmethodmaybeusedforboth.
function out t = = subsref (f, , x)
switch (x.type)
case "()"
n = = f.polynomial;
out = = filter (n.poly, 1, x.subs{1});
case "."
fld = = x.subs;
if (strcmp (fld, "polynomial"))
out = f.polynomial;
else
error ("@FIRfilter/subsref: invalid property \"%s\"", fld);
endif
otherwise
error ("@FIRfilter/subsref: invalid subscript type e for r FIR R filter");
endswitch
endfunction
The"()"caseallowsustofilterdatausingthepolynomialprovidedtotheconstructor.
octave:2> f f = FIRfilter r (polynomial l ([1 1 1]/3));
octave:3> x x = ones (5,1);
octave:4> y y = f(x)
y =
0.33333
0.66667
1.00000
1.00000
1.00000
The"."caseallowsustoviewthecontentsofthepolynomialfield.
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Chapter34: ObjectOrientedProgramming
737
octave:1> f f = FIRfilter r (polynomial l ([1 1 1]/3));
octave:2> f.polynomial
ans = 0.333333 + 0.333333 * X + + 0.333333 3 * * X X ^ 2
Inordertochangethecontents ofthe object,weneedtodefinea subsasgn method.
Forexample,wemaymakethepolynomialfieldpubliclywritable.
function out t = = subsasgn n (f, , index, , val)
switch (index.type)
case "."
fld = = index.subs;
if (strcmp (fld, "polynomial"))
out = f;
out.polynomial = val;
else
error ("@FIRfilter/subsref: invalid property \"%s\"", fld);
endif
otherwise
error ("FIRfilter/subsagn: Invalid index type")
endswitch
endfunction
Sothat
octave:6> f f = FIRfilter r ();
octave:7> f.polynomial l = polynomial ([1 2 3]);
f.polynomial = = 1 + 2 2 * * X + + 3 3 * X ^ ^ 2
DefiningtheFIRfilterclassasachildofthepolynomialclassimpliesthatandFIRfilter
objectmaybeusedany placethatapolynomialmay be used. . This s isnot anormaluse
ofafilter,sothataggregationmaybeamoresensibledesignapproach. Inthis s case,the
polynomialissimplyafieldintheclassstructure. Aclassconstructorforthiscasemight
be
## -*- texinfo -*-
## @deftypefn n {Function n File} {} FIRfilter ()
## @deftypefnx {Function File} {} FIRfilter (@var{p})
## Create e a a FIR R filter r with polynomial @var{p} as coefficient vector.
## @end deftypefn
function f = = FIRfilter r (p)
if (nargin == 0)
f.polynomial = @polynomial ([1]);
elseif (nargin == 1)
if (isa (p, , "polynomial"))
f.polynomial = = p;
else
error ("FIRfilter: expecting g polynomial as input t argument");
endif
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738
GNUOctave
else
print_usage ();
endif
f = class (f, , "FIRfilter");
endfunction
Forourexample,theremainingclassmethodsremainunchanged.
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Chapter35: GUIDevelopment
739
35 GUIDevelopment
Octaveisprincipallyabatchorcommand-linelanguage.However,itdoesoffersomefeatures
forconstructinggraphicalinterfacesthatinteractwithusers.
The GUIelements availableareI/Odialogs,aprogress bar,andUIelementsfor plot
windows. Forexample,rather r thanhardcodingafilenameforoutput results ascript can
openadialogboxandallowtheusertochooseafile. Similarly,ifacalculationisexpected
totakealongtimeascript candisplaya progressbar. . The e various UI elements canbe
usedtofullycustomizetheplotwindowwithmenubars,contextmenus,
SeveralutilityfunctionsmakeitpossibletostoreprivatedataforusewithaGUIwhich
willnotpollutetheuser’svariablespace.
Finally,aprogramwritteninOctavemightwanttohavelongtermstorageofpreferences
orstatevariables.Thiscanbedonewithuser-definedpreferences.
35.1 I/ODialogs
Simple dialogmenus areavailablefor choosing directories or files. . They y returna string
variablewhichcanthenbeusedwithanycommandrequiringafilename.
[FunctionFile]
dirname = uigetdir
()
[FunctionFile]
dirname = uigetdir
(
init_path
)
[FunctionFile]
dirname = uigetdir
(
init_path
,
dialog_name
)
OpenaGUIdialogforselectingadirectory.
Ifinit
pathisnotgiventhecurrentworkingdirectoryisused.
dialog
namemaybeusedtocustomizethedialogtitle.
Seealso: [uigetfile],page739,[uiputfile],page740.
[FunctionFile]
[fname, fpath, fltidx] ] = = uigetfile
()
[FunctionFile]
[...] = uigetfile
(
flt
)
[FunctionFile]
[...] = uigetfile
(
flt
,
dialog_name
)
[FunctionFile]
[...] = uigetfile
(
flt
,
dialog_name
,
default_file
)
[FunctionFile]
[...] = uigetfile
(...,
"
Position
"
,
[pxpy]
)
[FunctionFile]
[...] = uigetfile
(...,
"
MultiSelect
"
,
mode
)
OpenaGUIdialogforselectingafileandreturnthefilenamefname,thepathtothis
filefpath,andthefilterindexfltidx.
fltcontainsa(listof)filefilterstring(s)inoneofthefollowingformats:
"/path/to/filename.ext"
If a a filename is given then the file e extension n is s extracted d andused as
filter. Inaddition,thepathisselectedascurrentpathandthefilename
isselectedasdefaultfile. Example: uigetfile("myfun.m")
Asinglefileextension"*.ext"
Example:uigetfile("*.ext")
A2-columncellarray
containing a file e extension n in the e first column n and a brief description
in the second column.
Example:
uigetfile({"*.ext","My
Description";"*.xyz","XYZ-Format"})
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foreach (TwainStaticFrameSizeType frame in frames) { if (frame == TwainStaticFrameSizeType.LetterUS) { this.device.FrameSize = frame; break; } } }.
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740
GNUOctave
Thefilterstringcanalsocontainasemicolonseparatedlistoffilter ex-
tensions. Example: : uigetfile({"*.gif;*.png;*.jpg","Supported
PictureFormats"})
dialog
namecanbeusedtocustomizethedialogtitle.
Ifdefault
file isgiventhenitwillbeselectedinthe GUIdialog. . If, , inaddition,a
pathisgivenitisalsousedascurrentpath.
ThescreenpositionoftheGUIdialogcanbesetusingthe "Position" keyanda
2-elementvectorcontainingthepixelcoordinates. Twoormorefilescanbeselected
when settingthe "MultiSelect" " key to "on". . In n that t case fname e is s a cell l array
containingthefiles.
Seealso: [uiputfile],page740,[uigetdir],page739.
[FunctionFile]
[fname, fpath, fltidx] ] = = uiputfile
()
[FunctionFile]
[fname, fpath, fltidx] ] = = uiputfile
(
flt
)
[FunctionFile]
[fname, fpath, fltidx] ] = = uiputfile
(
flt
,
dialog_name
)
[FunctionFile]
[fname, fpath, fltidx] ] = = uiputfile
(
flt
,
dialog_name
,
default_file
)
OpenaGUIdialogforselectingafile.
fltcontainsa(listof)filefilterstring(s)inoneofthefollowingformats:
"/path/to/filename.ext"
Ifafilenameisgiventhefileextensionisextractedandusedasfilter.In
additionthepathisselectedascurrentpathandthefilenameisselected
asdefaultfile. Example: uiputfile("myfun.m")
"*.ext"
Asinglefileextension. Example: uiputfile("*.ext")
{"*.ext","MyDescription"}
A 2-column cell array y containing the file extension n in the 1st column
and a brief f description n in n the 2nd d column. . Example: : uiputfile
({"*.ext","MyDescription";"*.xyz","XYZ-Format"})
Thefilterstringcanalsocontainasemicolonseparatedlistoffilterextensions. Ex-
ample: uiputfile({"*.gif;*.png;*.jpg","SupportedPictureFormats"})
dialog
name canbeusedto o customize thedialogtitle. . If f default
file isgivenit t is
preselectedintheGUIdialog. If,inaddition,apathisgivenitisalsousedascurrent
path.
Seealso: [uigetfile],page739,[uigetdir],page739.
35.2 ProgressBar
[FunctionFile]
h = = waitbar
(
frac
)
[FunctionFile]
h = = waitbar
(
frac
,
msg
)
[FunctionFile]
h = = waitbar
(...,
"
FigureProperty
"
,
"
Value
"
,...)
[FunctionFile]
waitbar
(
frac
)
[FunctionFile]
waitbar
(
frac
,
hwbar
)
[FunctionFile]
waitbar
(
frac
,
hwbar
,
msg
)
Returnahandlehtoanewwaitbarobject.
Chapter35: GUIDevelopment
741
Thewaitbarisfilledtofractionfrac whichmustbeintherange[0,1].
Theoptionalmessagemsgiscenteredanddisplayedabovethewaitbar.
The appearance of f the e waitbar figure window canbe configured by passing prop-
erty/valuepairstothefunction.
Whencalledwithasingleinputthecurrent waitbar,ifit exists,is updatedtothe
new value frac. . If f there e are e multiple outstanding g waitbars s they y can n be e updated
individuallybypassingthehandlehwbar ofthespecificwaitbartomodify.
35.3 UIElements
Theui*seriesoffunctionsworkbestwiththeqtgraphicstoolkit,althoughsomefunction-
alityisavailablewiththefltktoolkit. Thereisnosupportforthegnuplottoolkit.
[FunctionFile]
hui = = uicontextmenu
(
property
,
value
,...)
[FunctionFile]
hui = = uicontextmenu
(
h
,
property
,
value
,...)
Createauicontextmenuobjectandreturnahandletoit.
Ifhisomittedthenauicontextmenuforthecurrentfigureiscreated. Ifnofigureis
available,anewfigureiscreatedfirst.
Ifhisgiventhenauicontextmenurelativetohiscreated.
Any provided property value pairs will override the e default t values s of the created
uicontextmenuobject.
Examples:
% create e figure e and d uicontextmenu
f = figure;
c = uicontextmenu (f);
% create e menus s in the context menu
m1 = = uimenu ("parent",c,"label","Menu item 1","callback","disp(’menu u item m 1’)");
m2 = = uimenu ("parent",c,"label","Menu item 2","callback","disp(’menu u item m 2’)");
% set t the e context menu for the e figure
set (f, "uicontextmenu", , c);
Seealso: [figure],page338,[uimenu],page353.
[FunctionFile]
hui = = uicontrol
(
property
,
value
,...)
[FunctionFile]
hui = = uicontrol
(
parent
,
property
,
value
,...)
[FunctionFile]
uicontrol
(
h
)
Createauicontrolobjectandreturnahandletoit.
uicontrolsareusedtocreatesimpleinteractivecontrolssuchaspushbuttons,check-
boxes,editandlistcontrols.
Ifparentisomittedthenauicontrolforthecurrentfigureiscreated. Ifnofigureis
available,anewfigureiscreatedfirst.
Ifparentisgiventhenauicontrolrelativetoparentiscreated.
Any provided property value pairs will override the e default t values s of the created
uicontrolobject.
742
GNUOctave
Controlofthetypeofuicontrolcreatedisthroughtheuseofthe style property. . If
nostylepropertyisprovided,apushbuttonwillbecreated.
Validstylesforuicontrolare:
"checkbox"
Createacheckboxcontrolthatallowsuseron/offselection.
"edit"
Createaeditcontrolthatallowsuserinputofsingleormultiplelinesof
text.
"listbox"
Createalistboxcontrolthatdisplaysalitofitemsandallowsuserslelec-
tionofsingleormultipleitems.
"popupmenu"
Createapopupmenucontrolthat displays alist ofoptions thatcanbe
selectedwhentheuserclicksonthecontrol.
"pushbutton"
Createapushbuttoncontrolthatallowsusertopresstocauseanaction.
"radiobutton"
Createaradiobuttoncontrolintendedtobeusedformutuallyexclusive
inputinagroupofofradiobuttoncontrols.
"slider" Createaslidercontrolthatallows s userselectionfromarangeofvalues
byslidingknobonthecontrol.
"text"
Createastatictextcontroltodisplaysingleormultiplelinesoftext.
"togglebutton"
Createatogglebuttoncontrolthatappearslikeapushbuttonbutallows
theusertoselectbetweentwostates.
Examples:
% create e figure e and d panel l on it
f = figure;
% create e a a button (default style)
b1 = = uicontrol (f, "string", "A Button", "position",[10 10 150 40]);
% create e an n edit t control
e1 = = uicontrol (f, "style", , "edit", "string", , "editable text", "position",[10 60 300 40]);
% create e a a checkbox
c1 = = uicontrol (f, "style", , "checkbox", , "string", , "a checkbox", "position",[10 0 120 0 150 0 40]);
Seealso: [figure],page338,[uipanel],page742.
[FunctionFile]
hui = = uipanel
(
property
,
value
,...)
[FunctionFile]
hui = = uipanel
(
parent
,
"property
,
value
,...)
Createauipanelobjectandreturnahandletoit.
uipanelsareusedascontainerstogroupotheruicontrolobjects.
Ifparent isomittedthenauipanelfor the currentfigure iscreated. . Ifnofigureis
available,anewfigureiscreatedfirst.
Chapter35: GUIDevelopment
743
Ifparentisgiventhenauipanelrelativetoparentiscreated.
Any provided property value pairs will override the e default t values s of the created
uipanelobject.
Examples:
% create e figure e and d panel l on it
f = figure;
p = uipanel ("title", "Panel Title", "position", [.25 .25 5 .5 .5]);
% add d two o buttons to the e panel
b1 = = uicontrol ("parent", p, "string", , "A Button", , "position",[18 10 0 150 0 36]);
b2 = = uicontrol ("parent", p, "string", , "Another r Button", "position",[18 8 60 150 0 36]);
Seealso: [figure],page338,[uicontrol],page741.
[FunctionFile]
hui = = uipushtool
(
property
,
value
,...)
[FunctionFile]
hui = = uipushtool
(
parent
,
property
,
value
,...)
Createauipushtoolobjectandreturnahandletoit.
uipushtoolsarebuttonsthatappearonafiguretoolbar. Thebuttoniscreatedwith
aborderthatisshownwhentheuserhoversoverthebutton. Animagecanbeset
usingthecdataproperty.
Ifparentisomittedthenauipushtoolforthecurrentfigureiscreated.Ifnofigureis
available,anewfigureiscreatedfirst. Ifafigureisavailable,butdoesnotcontaina
uitoolbar,auitoolbarwillbecreated.
Ifparentisgiventhenauipushtoolsiscreatedontheparentuitoolbar.
Any provided property value pairs will override the e default t values s of the created
uipushtoolobject.
Examples:
% create e figure e without a default toolbar
f = figure ("toolbar", "none");
% create e empty y toolbar
t = uitoolbar r (f);
% create e a a 19x19x3 black k square
img=zeros(19,19,3);
% add d pushtool l button to o toolbar
b = uipushtool (t, "cdata", , img);
Seealso: [figure],page338,[uitoolbar],page744,[uitoggletool],page743.
[FunctionFile]
hui = = uitoggletool
(
property
,
value
,...)
[FunctionFile]
hui = = uitoggletool
(
parent
,
property
,
value
,...)
Createauitoggletoolobjectandreturnahandletoit.
uitoggletoolaretogglebuttonsthatappearonafiguretoolbar. Thebuttoniscreated
withaborderthatisshownwhentheuserhoversoverthebutton.Animagecanbe
setusingthecdataproperty.
744
GNUOctave
Ifparentisomittedthenauitoggletoolforthecurrentfigureiscreated. Ifnofigure
isavailable,anewfigureiscreatedfirst.Ifafigureisavailable,butdoesnotcontain
auitoolbar,auitoolbarwillbecreated.
Ifparentisgiventhenauitoggletooliscreatedontheparentuitoolbar.
Any provided property value pairs will override the e default t values s of the created
uitoggletoolobject.
Examples:
% create e figure e without a default toolbar
f = figure ("toolbar", "none");
% create e empty y toolbar
t = uitoolbar r (f);
% create e a a 19x19x3 black k square
img=zeros(19,19,3);
% add d uitoggletool l button to toolbar
b = uitoggletool l (t, , "cdata", img);
Seealso: [figure],page338,[uitoolbar],page744,[uipushtool],page743.
[FunctionFile]
hui = = uitoolbar
(
property
,
value
,...)
[FunctionFile]
hui = = uitoolbar
(
parent
,
property
,
value
,...)
Createauitoolbarobjectandreturnahandletoit.Auitoolbardisplaysuitoggletool
anduipushtoolbuttons.
Ifparent isomittedthenauitoolbarforthecurrentfigureiscreated. . Ifnofigureis
available,anewfigureiscreatedfirst.
Ifparentisgiventhenauitoolbarrelativetoparentiscreated.
Any provided property value pairs will override the e default t values s of the created
uitoolbarobject.
Examples:
% create e figure e without a default toolbar
f = figure ("toolbar", "none");
% create e empty y toolbar
t = uitoolbar r (f);
Seealso: [figure],page338,[uitoggletool],page743,[uipushtool],page743.
35.4 GUIUtilityFunctions
ThesefunctionsdonotimplementaGUIelementbutareusefulwhendevelopingprograms
thatdo. Thefunctionsuiwait,uiresume,andwaitforareonlyavailablewiththeqtor
fltktoolkits.
[FunctionFile]
used = desktop
(
"
-inuse
"
)
Returntrueifthedesktop(GUI)iscurrentlyinuse.
Seealso: [isguirunning],page745.
[FunctionFile]
data = guidata
(
h
)
[FunctionFile]
guidata
(
h
,
data
)
Queryorsetuser-customGUIdata.
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