source: trunk/documents/UserDoc/UsersGuides/ForApplicationDeveloper/html/Control/userInterfaceCommand.html

Last change on this file was 1208, checked in by garnier, 16 years ago

CVS update
File size: 26.6 KB
RevLine 
[1208]1<HTML>
2<TITLE>
3</TITLE>
4<!-- Changed by: Katsuya Amako, 21-Sep-1998 -->
5<!-- Changed by: Katsuya Dosanjh, 15-Jul-2000 -->
6<!-- Changed by: Dennis Wright, 29-Nov-2001 -->
7<!-- Changed by: Jacek Generowicz, 13-Mar-2002 -->
8<!-- Proof read by: Joe Chuma, 2-Jul-1999 -->
9
10<BODY>
11<TABLE WIDTH="100%"><TR>
12<TD>
13
14
15<A HREF="index.html">
16<IMG SRC="../../../../resources/html/IconsGIF/Contents.gif" ALT="Contents"></A>
17<A HREF="commands.html">
18<IMG SRC="../../../../resources/html/IconsGIF/Previous.gif" ALT="Previous"></A>
19<A>
20<IMG SRC="../../../../resources/html/IconsGIF/NextGR.gif" ALT="Next"></A>
21</TD>
22<TD ALIGN="Right">
23<FONT SIZE="-1" COLOR="#238E23">
24<B>Geant4 User's Guide</B>
25<BR>
26<B>For Application Developers</B>
27<BR>
28<B>Communication and Control</B>
29</FONT>
30</TD>
31</TR></TABLE>
32<BR><BR>
33
34<P ALIGN="Center">
35<FONT SIZE="+3" COLOR="#238E23">
36<B>7.2 User Interface - Defining New Commands</B>
37</FONT>
38<BR><BR>
39
40<HR ALIGN="Center" SIZE="7%">
41<p>
42
43<a name="7.2.1">
44<H2>7.2.1 <i>G4UImessenger</i></H2></a>
45
46 <i>G4UImessenger</i> is a base class which represents a messenger
47 that delivers command(s) to the destination class object.
48 Your concrete messenger should have the following
49 functionalities.
50 <ul>
51 <li>Construct your command(s) in the constructor of your messenger.
52 <li>Destruct your command(s) in the destructor of your messenger.
53 </ul>
54 These requirements mean that your messenger should
55 keep all pointers to your command objects as its data members.
56<p>
57 You can use <i>G4UIcommand</i> derived classes
58 for the most frequent types of command. These derived classes have their
59 own conversion methods according to their types, and they make implementation of
60 the <tt>SetNewValue()</tt> and <tt>GetCurrentValue()</tt> methods of your messenger
61 much easier and simpler.
62<p>
63 For complicated commands which take various parameters,
64 you can use the <i>G4UIcommand</i> base class, and construct <i>G4UIparameter</i>
65 objects by yourself. You don't need to delete <i>G4UIparameter</i>
66 object(s).
67<p>
68 In the <tt>SetNewValue()</tt> and <tt>GetCurrentValue()</tt> methods of your messenger,
69 you can compare the <i>G4UIcommand</i> pointer given in the argument of these
70 methods with the pointer of your command, because your messenger keeps
71 the pointers to the commands. Thus, you don't need to compare by
72 command name. Please remember, in the cases where you use <i>G4UIcommand</i>
73 derived classes, you should store the pointers
74 with the types of these derived classes so that you can use methods
75 defined in the derived classes according to their types without casting.
76<p>
77 <i>G4UImanager/G4UIcommand/G4UIparameter</i> have
78 very powerful type and range checking routines. You are strongly
79 recommended to set the range of your parameters. For the case of a
80 numerical value (<tt>int</tt> or <tt>double</tt>), the range can be given by a <i>G4String</i>
81 using C++ notation, e.g., <tt>"X &gt; 0 &amp;&amp; X &lt; 10"</tt>.
82 For the case of a string type parameter, you can set a
83 candidate list. Please refer to the detailed
84 descriptions below.
85<p>
86 <tt>GetCurrentValue()</tt> will be invoked after the user's application of
87 the corresponding command, and before the <tt>SetNewValue()</tt> invocation.
88 This <tt>GetCurrentValue()</tt> method will be invoked only if
89 <ul>
90 <li>at least one parameter of the command has a range
91 <li>at least one parameter of the command has a candidate list
92 <li>at least the value of one parameter is omitted and this parameter
93 is defined as omittable and <tt>currentValueAsDefault</tt>
94 </ul>
95 For the first two cases, you can re-set the range or the candidate
96 list if you need to do so, but these ``re-set'' parameters are needed only for
97 the case where the range or the candidate list varies dynamically.
98<p>
99 A command can be ``state sensitive'', i.e., the command can
100 be accepted only for a certain <i>G4ApplicationState</i>(s). For
101 example, the <tt>/run/beamOn</tt> command should not be accepted when
102 Geant4 is processing another event (``G4State_EventProc'' state). You can
103 set the states available for the command with the
104 <tt>AvailableForStates()</tt> method.
105<p>
106
107<HR>
108<a name="7.2.2">
109<H2>7.2.2 <i>G4UIcommand</i> and its derived classes</H2></a>
110
111 <dl>
112 <dt>Methods available for all derived classes<p>
113 <dd>These are methods defined in the <i>G4UIcommand</i> base class which should be
114 used from the derived classes.<p>
115 <ul>
116 <li><tt>void SetGuidance(char*)</tt><p>
117 Define a guidance line. You can invoke this method as many times
118 as you need to give enough amount of guidance. Please note that
119 the first line will be used as a title head of the command guidance.<p>
120 <li><tt>void availableForStates(G4ApplicationState s1,...)</tt><p>
121 If your command is valid only for certain states of the Geant4 kernel,
122 specify these states by this method. Currently available states are
123 <tt>G4State_PreInit, G4State_Init, G4State_Idle, G4State_GeomClosed,</tt>
124 and <tt>G4State_EventProc</tt>. Refer to the section 3.4.2 for meaning of
125 each state. Please note that
126 the <tt>Pause</tt> state had been removed from <i>G4ApplicationState</i>.<p>
127 <li><tt>void SetRange(char* range)</tt><p>
128 Define a range of the parameter(s). Use C++ notation, e.g.,
129 <tt>"x &gt; 0 &amp;&amp; x &lt; 10"</tt>, with variable name(s) defined by the
130 <tt>SetParameterName()</tt> method. For the case of a <i>G4ThreeVector</i>, you
131 can set the relation between parameters, e.g., <tt>"x &gt; y"</tt>.
132 </ul>
133 <p>
134 <dt><i>G4UIdirectory</i><p>
135 <dd>This is a <i>G4UIcommand</i> derived class for defining a directory.<p>
136 <ul>
137 <li><tt>G4UIdirectory(char* directoryPath)</tt><p>
138 Constructor. Argument is the (full-path) directory, which
139 must begin and terminate with `<tt>/</tt>'.
140 </ul>
141 <p>
142 <dt><i>G4UIcmdWithoutParameter</i><p>
143 <dd>This is a <i>G4UIcommand</i> derived class for a command which takes no parameter.<p>
144 <ul>
145 <li><tt>G4UIcmdWithoutParameter(char* commandPath,G4UImessenger* theMessenger)</tt><p>
146 Constructor. Arguments are the (full-path) command name
147 and the pointer to your messenger.
148 </ul>
149 <p>
150 <dt><i>G4UIcmdWithABool</i><p>
151 <dd>This is a <i>G4UIcommand</i> derived class which takes one boolean type parameter.<p>
152 <ul>
153 <li><tt>G4UIcmdWithABool(char* commandpath,G4UImanager* theMessenger)</tt><p>
154 Constructor. Arguments are the (full-path) command name
155 and the pointer to your messenger.<p>
156 <li><tt>void SetParameterName(char* paramName,G4bool omittable)</tt><p>
157 Define the name of the boolean parameter and set the omittable flag.
158 If omittable is true, you should define the default value using the
159 next method.<p>
160 <li><tt>void SetDefaultValue(G4bool defVal)</tt><p>
161 Define the default value of the boolean parameter.<p>
162 <li><tt>G4bool GetNewBoolValue(G4String paramString)</tt><p>
163 Convert <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
164 method of your messenger into boolean.<p>
165 <li><tt>G4String convertToString(G4bool currVal)</tt><p>
166 Convert the current boolean value to <i>G4String</i> which should
167 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
168 </ul>
169 <p>
170 <dt><i>G4UIcmdWithAnInteger</i><p>
171 <dd>This is a <i>G4UIcommand</i> derived class which takes one integer type parameter.<p>
172 <ul>
173 <li><tt>G4UIcmdWithAnInteger(char* commandpath,G4UImanager* theMessenger)</tt><p>
174 Constructor. Arguments are the (full-path) command name
175 and the pointer to your messenger.<p>
176 <li><tt>void SetParameterName(char* paramName,G4bool omittable)</tt><p>
177 Define the name of the integer parameter and set the omittable flag.
178 If omittable is true, you should define the default value using the
179 next method.<p>
180 <li><tt>void SetDefaultValue(G4int defVal)</tt><p>
181 Define the default value of the integer parameter.<p>
182 <li><tt>G4int GetNewIntValue(G4String paramString)</tt><p>
183 Convert <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
184 method of your messenger into integer.<p>
185 <li><tt>G4String convertToString(G4int currVal)</tt><p>
186 Convert the current integer value to <i>G4String</i>, which should
187 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
188 </ul>
189 <p>
190 <dt><i>G4UIcmdWithADouble</i><p>
191 <dd>This is a <i>G4UIcommand</i> derived class which takes one double type parameter.<p>
192 <ul>
193 <li><tt>G4UIcmdWithADouble(char* commandpath,G4UImanager* theMessenger)</tt><p>
194 Constructor. Arguments are the (full-path) command name
195 and the pointer to your messenger.<p>
196 <li><tt>void SetParameterName(char* paramName,G4bool omittable)</tt><p>
197 Define the name of the double parameter and set the omittable flag.
198 If omittable is true, you should define the default value using the
199 next method.<p>
200 <li><tt>void SetDefaultValue(G4double defVal)</tt><p>
201 Define the default value of the double parameter.<p>
202 <li><tt>G4double GetNewDoubleValue(G4String paramString)</tt><p>
203 Convert <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
204 method of your messenger into double.<p>
205 <li><tt>G4String convertToString(G4double currVal)</tt><p>
206 Convert the current double value to <i>G4String</i> which should
207 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
208 </ul>
209 <p>
210 <dt><i>G4UIcmdWithAString</i><p>
211 <dd>This is a <i>G4UIcommand</i> derived class which takes one string type parameter.<p>
212 <ul>
213 <li><tt>G4UIcmdWithAString(char* commandpath,G4UImanager* theMessenger)</tt><p>
214 Constructor. Arguments are the (full-path) command name
215 and the pointer to your messenger.<p>
216 <li><tt>void SetParameterName(char* paramName,G4bool omittable)</tt><p>
217 Define the name of the string parameter and set the omittable flag.
218 If omittable is true, you should define the default value using the
219 next method.<p>
220 <li><tt>void SetDefaultValue(char* defVal)</tt><p>
221 Define the default value of the string parameter.<p>
222 <li><tt>void SetCandidates(char* candidateList)</tt><p>
223 Define a candidate list which can be taken by the parameter.
224 Each candidate listed in this list should be separated by a single
225 space. If this candidate list is given, a string given by the user
226 but which is not listed in this list will be rejected.
227 </ul>
228 <p>
229 <dt><i>G4UIcmdWith3Vector</i><p>
230 <dd>This is a <i>G4UIcommand</i> derived class which takes one three vector parameter.<p>
231 <ul>
232 <li><tt>G4UIcmdWith3Vector(char* commandpath,G4UImanager* theMessenger)</tt><p>
233 Constructor. Arguments are the (full-path) command name
234 and the pointer to your messenger.<p>
235 <li><tt>void SetParameterName</tt><br>
236 &nbsp;&nbsp;<tt>(char* paramNamX,char* paramNamY,char* paramNamZ,G4bool omittable)</tt><p>
237 Define the names of each component of the three vector and set
238 the omittable flag. If omittable is true, you should define the default
239 value using the next method.<p>
240 <li><tt>void SetDefaultValue(G4ThreeVector defVal)</tt><p>
241 Define the default value of the three vector.<p>
242 <li><tt>G4ThreeVector GetNew3VectorValue(G4String paramString)</tt><p>
243 Convert the <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
244 method of your messenger into a <i>G4ThreeVector</i>.<p>
245 <li><tt>G4String convertToString(G4ThreeVector currVal)</tt><p>
246 Convert the current three vector to <i>G4String</i>, which should
247 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
248 </ul>
249 <p>
250 <dt><i>G4UIcmdWithADoubleAndUnit</i><p>
251 <dd>This is a <i>G4UIcommand</i> derived class which takes one double type parameter
252 and its unit.<p>
253 <ul>
254 <li><tt>G4UIcmdWithADoubleAndUnit(char* commandpath,G4UImanager* theMessenger)</tt><p>
255 Constructor. Arguments are the (full-path) command name
256 and the pointer to your messenger.<p>
257 <li><tt>void SetParameterName(char* paramName,G4bool omittable)</tt><p>
258 Define the name of the double parameter and set the omittable flag.
259 If omittable is true, you should define the default value using the
260 next method.<p>
261 <li><tt>void SetDefaultValue(G4double defVal)</tt><p>
262 Define the default value of the double parameter.<p>
263 <li><tt>void SetUnitCategory(char* unitCategory)</tt><p>
264 Define acceptable unit category.<p>
265 <li><tt>void SetDefaultUnit(char* defUnit)</tt><p>
266 Define the default unit. Please use this method and the <tt>SetUnitCategory()</tt>
267 method alternatively.<p>
268 <li><tt>G4double GetNewDoubleValue(G4String paramString)</tt><p>
269 Convert <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
270 method of your messenger into double. Please note
271 that the return value has already been multiplied
272 by the value of the given unit.<p>
273 <li><tt>G4double GetNewDoubleRawValue(G4String paramString)</tt><p>
274 Convert <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
275 method of your messenger into double but without multiplying
276 the value of the given unit.<p>
277 <li><tt>G4double GetNewUnitValue(G4String paramString)</tt><p>
278 Convert <i>G4String</i> unit value given by the <tt>SetNewValue()</tt>
279 method of your messenger into double.<p>
280 <li><tt>G4String convertToString(G4bool currVal,char* unitName)</tt><p>
281 Convert the current double value to a <i>G4String</i>, which should
282 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
283 The double value will be divided by the value of the given unit
284 and converted to a string. Given unit will be added to the string.
285 </ul>
286 <p>
287 <dt><i>G4UIcmdWith3VectorAndUnit</i><p>
288 <dd>This is a <i>G4UIcommand</i> derived class which takes one three vector parameter
289 and its unit.<p>
290 <ul>
291 <li><tt>G4UIcmdWith3VectorAndUnit(char* commandpath,G4UImanager* theMessenger)</tt><p>
292 Constructor. Arguments are the (full-path) command name
293 and the pointer to your messenger.<p>
294 <li><tt>void SetParameterName</tt><br>
295 &nbsp;&nbsp;<tt>(char* paramNamX,char* paramNamY,char* paramNamZ,G4bool omittable)</tt><p>
296 Define the names of each component of the three vector and set
297 the omittable flag. If omittable is true, you should define the default
298 value using the next method.<p>
299 <li><tt>void SetDefaultValue(G4ThreeVector defVal)</tt><p>
300 Define the default value of the three vector.<p>
301 <li><tt>void SetUnitCategory(char* unitCategory)</tt><p>
302 Define acceptable unit category.<p>
303 <li><tt>void SetDefaultUnit(char* defUnit)</tt><p>
304 Define the default unit. Please use this method and the <tt>SetUnitCategory()</tt>
305 method alternatively.<p>
306 <li><tt>G4ThreeVector GetNew3VectorValue(G4String paramString)</tt><p>
307 Convert a <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
308 method of your messenger into a <i>G4ThreeVector</i>.
309 Please note that the return value has already been multiplied
310 by the value of the given unit.<p>
311 <li><tt>G4ThreeVector GetNew3VectorRawValue(G4String paramString)</tt><p>
312 Convert a <i>G4String</i> parameter value given by the <tt>SetNewValue()</tt>
313 method of your messenger into three vector, but without multiplying
314 the value of the given unit.<p>
315 <li><tt>G4double GetNewUnitValue(G4String paramString)</tt><p>
316 Convert a <i>G4String</i> unit value given by the <tt>SetNewValue()</tt>
317 method of your messenger into a double.<p>
318 <li><tt>G4String convertToString(G4ThreeVector currVal,char* unitName)</tt><p>
319 Convert the current three vector to a <i>G4String</i> which should
320 be returned by the <tt>GetCurrentValue()</tt> method of your messenger.
321 The three vector value will be divided by the value of the given unit
322 and converted to a string. Given unit will be added to the string.
323 </ul>
324 <p>
325 <dt>Additional comments on the <tt>SetParameterName()</tt> method<p>
326 <dd>You can add one additional argument of <tt>G4bool</tt> type for every
327 <tt>SetParameterName()</tt> method mentioned above. This additional argument
328 is named <tt>currentAsDefaultFlag</tt> and the
329 default value of this argument is <tt>false</tt>. If you assign this extra
330 argument as <tt>true</tt>, the default value of the parameter will be
331 overriden by the current value of the target class.
332 </dl>
333
334<p>
335
336<HR>
337<a name="7.2.3">
338<H2>7.2.3 An example messenger</H2></a>
339
340 This example is of <i>G4ParticleGunMessenger</i>, which is made by
341 inheriting <i>G4UIcommand</i>.
342<p>
343
344<center>
345<table border=2 cellpadding=10>
346<tr>
347<td>
348<pre>
349#ifndef G4ParticleGunMessenger_h
350#define G4ParticleGunMessenger_h 1
351
352class G4ParticleGun;
353class G4ParticleTable;
354class G4UIcommand;
355class G4UIdirectory;
356class G4UIcmdWithoutParameter;
357class G4UIcmdWithAString;
358class G4UIcmdWithADoubleAndUnit;
359class G4UIcmdWith3Vector;
360class G4UIcmdWith3VectorAndUnit;
361
362#include "G4UImessenger.hh"
363#include "globals.hh"
364
365class G4ParticleGunMessenger: public G4UImessenger
366{
367 public:
368 G4ParticleGunMessenger(G4ParticleGun * fPtclGun);
369 ~G4ParticleGunMessenger();
370
371 public:
372 void SetNewValue(G4UIcommand * command,G4String newValues);
373 G4String GetCurrentValue(G4UIcommand * command);
374
375 private:
376 G4ParticleGun * fParticleGun;
377 G4ParticleTable * particleTable;
378
379 private: //commands
380 G4UIdirectory * gunDirectory;
381 G4UIcmdWithoutParameter * listCmd;
382 G4UIcmdWithAString * particleCmd;
383 G4UIcmdWith3Vector * directionCmd;
384 G4UIcmdWithADoubleAndUnit * energyCmd;
385 G4UIcmdWith3VectorAndUnit * positionCmd;
386 G4UIcmdWithADoubleAndUnit * timeCmd;
387
388};
389
390#endif </pre>
391</td>
392</tr>
393<tr>
394<td align=center>
395 Source listing 7.2.1<BR>
396 An example of <tt>G4ParticleGunMessenger.hh</tt>.
397</td>
398</tr>
399</table></center>
400<p>
401
402<center>
403<table border=2 cellpadding=10>
404<tr>
405<td>
406<pre>
407#include "G4ParticleGunMessenger.hh"
408#include "G4ParticleGun.hh"
409#include "G4Geantino.hh"
410#include "G4ThreeVector.hh"
411#include "G4ParticleTable.hh"
412#include "G4UIdirectory.hh"
413#include "G4UIcmdWithoutParameter.hh"
414#include "G4UIcmdWithAString.hh"
415#include "G4UIcmdWithADoubleAndUnit.hh"
416#include "G4UIcmdWith3Vector.hh"
417#include "G4UIcmdWith3VectorAndUnit.hh"
418#include &lt;iostream.h&gt;
419
420G4ParticleGunMessenger::G4ParticleGunMessenger(G4ParticleGun * fPtclGun)
421:fParticleGun(fPtclGun)
422{
423 particleTable = G4ParticleTable::GetParticleTable();
424
425 gunDirectory = new G4UIdirectory("/gun/");
426 gunDirectory-&gt;SetGuidance("Particle Gun control commands.");
427
428 listCmd = new G4UIcmdWithoutParameter("/gun/list",this);
429 listCmd-&gt;SetGuidance("List available particles.");
430 listCmd-&gt;SetGuidance(" Invoke G4ParticleTable.");
431
432 particleCmd = new G4UIcmdWithAString("/gun/particle",this);
433 particleCmd-&gt;SetGuidance("Set particle to be generated.");
434 particleCmd-&gt;SetGuidance(" (geantino is default)");
435 particleCmd-&gt;SetParameterName("particleName",true);
436 particleCmd-&gt;SetDefaultValue("geantino");
437 G4String candidateList;
438 G4int nPtcl = particleTable-&gt;entries();
439 for(G4int i=0;i&lt;nPtcl;i++)
440 {
441 candidateList += particleTable-&gt;GetParticleName(i);
442 candidateList += " ";
443 }
444 particleCmd-&gt;SetCandidates(candidateList);
445
446 directionCmd = new G4UIcmdWith3Vector("/gun/direction",this);
447 directionCmd-&gt;SetGuidance("Set momentum direction.");
448 directionCmd-&gt;SetGuidance("Direction needs not to be a unit vector.");
449 directionCmd-&gt;SetParameterName("Px","Py","Pz",true,true);
450 directionCmd-&gt;SetRange("Px != 0 || Py != 0 || Pz != 0");
451
452 energyCmd = new G4UIcmdWithADoubleAndUnit("/gun/energy",this);
453 energyCmd-&gt;SetGuidance("Set kinetic energy.");
454 energyCmd-&gt;SetParameterName("Energy",true,true);
455 energyCmd-&gt;SetDefaultUnit("GeV");
456 energyCmd-&gt;SetUnitCandidates("eV keV MeV GeV TeV");
457
458 positionCmd = new G4UIcmdWith3VectorAndUnit("/gun/position",this);
459 positionCmd-&gt;SetGuidance("Set starting position of the particle.");
460 positionCmd-&gt;SetParameterName("X","Y","Z",true,true);
461 positionCmd-&gt;SetDefaultUnit("cm");
462 positionCmd-&gt;SetUnitCandidates("micron mm cm m km");
463
464 timeCmd = new G4UIcmdWithADoubleAndUnit("/gun/time",this);
465 timeCmd-&gt;SetGuidance("Set initial time of the particle.");
466 timeCmd-&gt;SetParameterName("t0",true,true);
467 timeCmd-&gt;SetDefaultUnit("ns");
468 timeCmd-&gt;SetUnitCandidates("ns ms s");
469
470 // Set initial value to G4ParticleGun
471 fParticleGun-&gt;SetParticleDefinition( G4Geantino::Geantino() );
472 fParticleGun-&gt;SetParticleMomentumDirection( G4ThreeVector(1.0,0.0,0.0) );
473 fParticleGun-&gt;SetParticleEnergy( 1.0*GeV );
474 fParticleGun-&gt;SetParticlePosition(G4ThreeVector(0.0*cm, 0.0*cm, 0.0*cm));
475 fParticleGun-&gt;SetParticleTime( 0.0*ns );
476}
477
478G4ParticleGunMessenger::~G4ParticleGunMessenger()
479{
480 delete listCmd;
481 delete particleCmd;
482 delete directionCmd;
483 delete energyCmd;
484 delete positionCmd;
485 delete timeCmd;
486 delete gunDirectory;
487}
488
489void G4ParticleGunMessenger::SetNewValue(
490 G4UIcommand * command,G4String newValues)
491{
492 if( command==listCmd )
493 { particleTable-&gt;dumpTable(); }
494 else if( command==particleCmd )
495 {
496 G4ParticleDefinition* pd = particleTable-&gt;findParticle(newValues);
497 if(pd != NULL)
498 { fParticleGun-&gt;SetParticleDefinition( pd ); }
499 }
500 else if( command==directionCmd )
501 { fParticleGun-&gt;SetParticleMomentumDirection(directionCmd-&gt;
502 GetNew3VectorValue(newValues)); }
503 else if( command==energyCmd )
504 { fParticleGun-&gt;SetParticleEnergy(energyCmd-&gt;
505 GetNewDoubleValue(newValues)); }
506 else if( command==positionCmd )
507 { fParticleGun-&gt;SetParticlePosition(
508 directionCmd-&gt;GetNew3VectorValue(newValues)); }
509 else if( command==timeCmd )
510 { fParticleGun-&gt;SetParticleTime(timeCmd-&gt;
511 GetNewDoubleValue(newValues)); }
512}
513
514G4String G4ParticleGunMessenger::GetCurrentValue(G4UIcommand * command)
515{
516 G4String cv;
517
518 if( command==directionCmd )
519 { cv = directionCmd-&gt;ConvertToString(
520 fParticleGun-&gt;GetParticleMomentumDirection()); }
521 else if( command==energyCmd )
522 { cv = energyCmd-&gt;ConvertToString(
523 fParticleGun-&gt;GetParticleEnergy(),"GeV"); }
524 else if( command==positionCmd )
525 { cv = positionCmd-&gt;ConvertToString(
526 fParticleGun-&gt;GetParticlePosition(),"cm"); }
527 else if( command==timeCmd )
528 { cv = timeCmd-&gt;ConvertToString(
529 fParticleGun-&gt;GetParticleTime(),"ns"); }
530 else if( command==particleCmd )
531 { // update candidate list
532 G4String candidateList;
533 G4int nPtcl = particleTable-&gt;entries();
534 for(G4int i=0;i&lt;nPtcl;i++)
535 {
536 candidateList += particleTable-&gt;GetParticleName(i);
537 candidateList += " ";
538 }
539 particleCmd-&gt;SetCandidates(candidateList);
540 }
541 return cv;
542}</pre>
543</td>
544</tr>
545<tr>
546<td align=center>
547 Source listing 7.2.2<BR>
548 An example of <tt>G4ParticleGunMessenger.cc</tt>.
549</td>
550</tr>
551</table></center>
552<p>
553
554<HR>
555<a name="7.2.4">
556<H2>7.2.4 How to control the output of <i>G4cout/G4cerr</i></H2></a>
557
558 Instead of <i>cout</i> and <i>cerr</i>, Geant4 uses <i>G4cout</i> and
559 <i>G4cerr</i>. Output streams from <i>G4cout/G4cerr</i> are handled by
560 <i>G4UImanager</i> which allows the application programmer to control the
561 flow of the stream. Output strings may therefore be displayed on another
562 window or stored in a file. This is accomplished as follows:
563<p>
564 <ol>
565 <li>Derive a class from <i>G4UIsession</i> and implement the two methods:
566 <pre>
567 G4int ReceiveG4cout(G4String coutString);
568 G4int ReceiveG4cerr(G4String cerrString);
569 </pre>
570 These methods receive the string stream of <i>G4cout</i> and
571 <i>G4cerr</i>, respectively. The string can be handled to meet
572 specific requirements. The following sample code shows how to
573 make a log file of the output stream:
574 <pre>
575 ostream logFile;
576 logFile.open("MyLogFile");
577 G4int MySession::ReceiveG4cout(G4String coutString)
578 {
579 logFile << coutString << flush;
580 return 0;
581 }
582 </pre>
583 <p>
584 <li>Set the destination of <i>G4cout/G4cerr</i> using
585 <tt>G4UImanager::SetCoutDestination(session)</tt>.
586 <p>
587 Typically this method is invoked from the constructor of
588 <i>G4UIsession</i> and its derived classes, such as <i>G4UIGAG/G4UIteminal</i>.
589 This method sets the destination of <i>G4cout/G4cerr</i> to the session.
590 For example, when the following code appears in the constructor of
591 <i>G4UIterminal</i>, the method <tt>SetCoutDestination(this)</tt> tells <i>UImanager</i>
592 that this instance of <i>G4UIterminal</i> receives the stream generated
593 by <i>G4cout</i>.
594 <pre>
595
596 G4UIterminal::G4UIterminal()
597 {
598 UI = G4UImanager::GetUIpointer();
599 UI->SetCoutDestination(this);
600 // ...
601 }
602
603 </pre>
604 Similarly, <tt>UI->SetCoutDestination(NULL)</tt> must be added
605 to the destructor of the class.
606 <p>
607 <li>Write or modify the main program. To modify <tt>exampleN01</tt> to
608 produce a log file, derive a class as described in step 1 above, and
609 add the following lines to the main program:
610 <pre>
611 #include "MySession.hh"
612 main()
613 {
614 // get the pointer to the User Interface manager
615 G4UImanager* UI = G4UImanager::GetUIpointer();
616 // construct a session which receives G4cout/G4cerr
617 MySession * LoggedSession = new MySession;
618 UI->SetCoutDestination(LoggedSession);
619 // session->SessionStart(); // not required in this case
620 // .... do simulation here ...
621
622 delete LoggedSession;
623 return 0;
624 }
625 </pre>
626 </ol>
627
628 <table>
629 <tr>
630 <td valign=top>Note:
631 <td><i>G4cout/G4cerr</i> should not be used in the constructor of a class if
632 the instance of the class is intended to be used as <tt>static</tt>.
633 This restriction comes from the language specification of C++.
634 See the documents below for details.
635 </table>
636<p>
637 M.A.Ellis, B.Stroustrup. ``Annotated C++ Reference Manual'', Section 3.4<br>
638 P.J.Plauger, ``The Draft Standard C++ Library''
639<p>
640
641<BR><BR>
642<HR>
643<A HREF="../../../../Authors/html/subjectsToAuthors.html">
644<I>About the authors</A></I>
645</BODY>
646</HTML>
647
Note: See TracBrowser for help on using the repository browser.