1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/nsplugin/examples/grapher/grapher.doc:1 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Grapher Plugin</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
<a href="index.html">
<font color="#004faf">Home</font></a>
| <a href="classes.html">
<font color="#004faf">All Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped Classes</font></a>
| <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Grapher Plugin</h1>
<p> This example graphs data from a simple text file. It
demonstrates the use of the <a href="qnpinstance.html#writeReady">TQNPInstance::writeReady</a>()
and <a href="qnpinstance.html#write">TQNPInstance::write</a>() functions.
<p> To build the example, you must first build the
<a href=nsplugin.html>TQt Netscape Plugin Extension</a> library.
Then type <tt>make</tt> in <tt>extensions/nsplugin/examples/grapher/</tt>
and copy the resulting <tt>grapher.so</tt> or <tt>npgrapher.dll</tt>
to the Plugins directory of your WWW browser.
<p> <EMBED ALIGN=LEFT WIDTH=49% HEIGHT=300 SRC=graph.g1n
graphstyle=pie fontfamily=times fontsize=18>
<p> The text file it accepts as input has a title line, then
a sequence of lines with a number, then a string. The
plugin displays a pie chart of the numbers, each segment
labelled by the associated string. The user can select
a bar chart view of the same data by selecting from the
menu that appears when they point at the plugin.
<p> The HTML tag used to embed the graph is:
<small>
<pre>
<EMBED
SRC=graph.g1n
ALIGN=LEFT
WIDTH=49% HEIGHT=300
graphstyle=pie fontfamily=times
fontsize=18>
</pre><p> </small>
Note that some HTML arguments (which we have capitalized here)
are interpreted by the browser, while others are used by the
plugin.
<p> <br clear>
With the simplicity and cross-platform nature of TQt-based plugins,
pages like <a href="http://www.netcraft.com/survey/">Netcraft's
Server Graphs</a> can be provided much more efficiently for both
the service provider and consumer. Data need not be converted
to an image at the server.
<p> <br clear>
<hr>
Implementation:
<p> <pre>// Include TQt Netscape Plugin classes.
#include "ntqnp.h"
// Include other TQt classes.
#include <<a href="tqpainter-h.html">tqpainter.h</a>>
#include <<a href="tqtextstream-h.html">tqtextstream.h</a>>
#include <<a href="tqbuffer-h.html">tqbuffer.h</a>>
#include <<a href="tqpixmap-h.html">tqpixmap.h</a>>
#include <<a href="tqmenubar-h.html">tqmenubar.h</a>>
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
#include <<a href="tqptrlist-h.html">tqptrlist.h</a>>
#include <<a href="qmessagebox-h.html">ntqmessagebox.h</a>>
// Include some C library functions.
#include <math.h>
#include <stdlib.h>
#ifndef M_PI // Some math.h don't include this.
#define M_PI 3.14159265358979323846264338327950288
#endif
//
// GraphModel is a simple abstract class that describes
// a table of numeric and text data.
//
class GraphModel {
public:
enum ColType { Numeric, Label };
union Datum {
double dbl;
<a href="tqstring.html">TQString</a>* str;
};
virtual TQPtrList<Datum>& graphData()=0;
virtual ColType colType(int col) const=0;
virtual int nCols() const=0;
};
//
// Graph is a widget subclass that displays a GraphModel.
// Since the widget is a TQNPWidget, it can be used as a plugin window,
// returned by Grapher::newWindow() below.
//
class Graph : public <a href="qnpwidget.html">TQNPWidget</a> {
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
// Constructs a Graph to display a GraphModel
//
Graph(GraphModel&);
~Graph();
// Two styles are available - Pie and Bar graph
//
enum Style { Pie, Bar };
static const char* styleName[];
void setStyle(Style);
void setStyle(const char*);
// Timer event processing rotates the pie graph
//
void timerEvent(TQTimerEvent*);
// These functions are provided by TQNPWidget - we override
// them to hide and show the plugin menubar.
//
void enterInstance();
void leaveInstance();
// Paint the graph...
//
void paintEvent(TQPaintEvent*);
//
// ... as either a "Loading" message, a Bar graph, a Pie graph,
// or an error message.
//
void paintWait(TQPaintEvent*);
void paintBar(TQPaintEvent*);
void paintPie(TQPaintEvent*);
void paintError(const char*);
signals:
// Signals emitted when the Help menus are selected.
void aboutPlugin();
void aboutData();
private:
GraphModel& model;
<a href="tqmenubar.html">TQMenuBar</a> *menubar;
Style style;
<a href="tqpopupmenu.html">TQPopupMenu</a>* stylemenu;
int pieRotationTimer;
int pieRotation;
<a href="tqpixmap.html">TQPixmap</a> pm;
private slots:
void setStyleFromMenu(int id);
};
<a name="f564"></a>Graph::Graph( GraphModel& mdl ) :
model(mdl),
<a href="tqwidget.html#style">style</a>(Bar),
pieRotationTimer(0),
pieRotation(0)
{
// Create a menubar for the widget
//
menubar = new <a href="tqmenubar.html">TQMenuBar</a>( this );
stylemenu = new <a href="tqpopupmenu.html">TQPopupMenu</a>;
<a name="x2768"></a> stylemenu-><a href="tqpopupmenu.html#setCheckable">setCheckable</a>(TRUE);
for ( Style s = Pie; styleName[s]; s = Style(s+1)) {
stylemenu-><a href="tqmenudata.html#insertItem">insertItem</a>(styleName[s], s+100);
}
<a name="x2767"></a> <a href="tqobject.html#connect">connect</a>(stylemenu, TQ_SIGNAL(<a href="tqpopupmenu.html#activated">activated</a>(int)),
this, TQ_SLOT(setStyleFromMenu(int)));
<a href="tqwidget.html#setStyle">setStyle</a>(Pie);
menubar-><a href="tqmenudata.html#insertItem">insertItem</a>("Style", stylemenu);
menubar-><a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
<a href="tqpopupmenu.html">TQPopupMenu</a>* help = new <a href="tqpopupmenu.html">TQPopupMenu</a>;
help-><a href="tqmenudata.html#insertItem">insertItem</a>( "About plugin...", this, TQ_SIGNAL(aboutPlugin()) );
help-><a href="tqmenudata.html#insertItem">insertItem</a>( "About data...", this, TQ_SIGNAL(aboutData()) );
menubar-><a href="tqmenudata.html#insertItem">insertItem</a>("Help", help);
<a name="x2745"></a> menubar-><a href="tqmenubar.html#hide">hide</a>();
}
Graph::~Graph()
{
}
<a name="x2778"></a>void Graph::<a href="tqwidget.html#setStyle">setStyle</a>(Style s)
{
if (style != s) {
if (pieRotationTimer)
<a href="tqobject.html#killTimer">killTimer</a>(pieRotationTimer);
<a name="x2749"></a> stylemenu-><a href="tqmenudata.html#setItemChecked">setItemChecked</a>(100+style, FALSE);
style = s;
if ( style == Pie )
pieRotationTimer = <a href="tqobject.html#startTimer">startTimer</a>( 80 );
else
pieRotationTimer = 0;
stylemenu-><a href="tqmenudata.html#setItemChecked">setItemChecked</a>(100+style, TRUE);
<a href="tqwidget.html#update">update</a>();
}
}
<a name="x2755"></a>void Graph::<a href="tqobject.html#timerEvent">timerEvent</a>(TQTimerEvent*)
{
pieRotation = ( pieRotation + 6 ) % 360; repaint(FALSE);
}
void Graph::<a href="tqwidget.html#setStyle">setStyle</a>(const char* stext)
{
for ( Style s = Pie; styleName[s]; s = Style(s+1) ) {
if ( <a href="tqcstring.html#qstricmp">tqstricmp</a>(stext,styleName[s])==0 ) {
<a href="tqwidget.html#setStyle">setStyle</a>(s);
return;
}
}
}
<a name="x2753"></a>void Graph::<a href="qnpwidget.html#enterInstance">enterInstance</a>()
{
<a name="x2746"></a> menubar-><a href="tqmenubar.html#show">show</a>();
}
<a name="x2754"></a>void Graph::<a href="qnpwidget.html#leaveInstance">leaveInstance</a>()
{
menubar-><a href="tqmenubar.html#hide">hide</a>();
}
void <a name="f565"></a>Graph::paintError(const char* e)
{
<a href="tqpainter.html">TQPainter</a> p(this);
int w = <a href="tqwidget.html#width">width</a>();
<a name="x2760"></a> p.<a href="tqpainter.html#drawText">drawText</a>(w/8, 0, w-w/4, height(), AlignCenter|WordBreak, e);
}
void <a name="f566"></a>Graph::paintBar(TQPaintEvent* event)
{
if ( model.colType(0) != GraphModel::Numeric ) {
paintError("First column not numeric, cannot draw bar graph\n");
return;
}
<a href="tqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData();
double max = 0.0;
<a name="x2772"></a> for (GraphModel::Datum* rowdata = data.<a href="tqptrlist.html#first">first</a>();
<a name="x2773"></a> rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
if (rowdata[0].dbl > max) max = rowdata[0].dbl;
}
const uint w = <a href="tqwidget.html#width">width</a>();
const uint h = <a href="tqwidget.html#height">height</a>();
<a href="tqpainter.html">TQPainter</a> p(this);
<a name="x2762"></a> p.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect());
<a name="x2771"></a> if ( w > data.<a href="tqptrlist.html#count">count</a>() ) {
// More pixels than data
int x = 0;
int i = 0;
<a href="tqfontmetrics.html">TQFontMetrics</a> fm=<a href="tqwidget.html#fontMetrics">fontMetrics</a>();
<a name="x2741"></a> int fh = fm.<a href="tqfontmetrics.html#height">height</a>();
for (GraphModel::Datum* rowdata = data.<a href="tqptrlist.html#first">first</a>();
rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
<a href="tqcolor.html">TQColor</a> c;
<a name="x2740"></a> c.<a href="tqcolor.html#setHsv">setHsv</a>( (i * 255)/data.<a href="tqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect
p.<a href="tqpainter.html#setBrush">setBrush</a>(c);
int bw = (w-w/4-x)/(data.<a href="tqptrlist.html#count">count</a>()-i);
int bh = int((h-h/4-1)*rowdata[0].dbl/max);
p.<a href="tqpainter.html#drawRect">drawRect</a>( w/8+x, h-h/8-1-bh, bw, bh );
i++;
x+=bw;
}
} else {
// More data than pixels
int x = 0;
int i = 0;
double av = 0.0;
int n = 0;
for (GraphModel::Datum* rowdata = data.<a href="tqptrlist.html#first">first</a>(); rowdata;
rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
int bx = i*w/data.<a href="tqptrlist.html#count">count</a>();
if (bx > x) {
<a href="tqcolor.html">TQColor</a> c;
c.<a href="tqcolor.html#setHsv">setHsv</a>( (x * 255)/w, 255, 255 );// rainbow effect
p.<a href="tqpainter.html#setPen">setPen</a>(c);
int bh = int(h*av/n/max);
p.<a href="tqpainter.html#drawLine">drawLine</a>(x,h-1,x,h-bh);
av = 0.0;
n = 0;
x = bx;
}
av += rowdata[0].dbl;
n++;
i++;
}
}
}
void <a name="f567"></a>Graph::paintPie(TQPaintEvent* event)
{
if ( model.colType(0) != GraphModel::Numeric ) {
paintError("First column not numeric, cannot draw pie graph\n");
return;
}
<a href="tqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData();
double total = 0.0;
GraphModel::Datum* rowdata;
for (rowdata = data.<a href="tqptrlist.html#first">first</a>();
rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
total += rowdata[0].dbl;
}
// Only use first column for pie chart
if ( !total ) return;
int apos = (pieRotation-90)*16;
const int w = <a href="tqwidget.html#width">width</a>();
const int h = <a href="tqwidget.html#height">height</a>();
const int xd = w - w/5;
const int yd = h - h/5;
<a name="x2766"></a> pm.<a href="tqpixmap.html#resize">resize</a>(<a href="tqwidget.html#width">width</a>(),height());
<a name="x2765"></a> pm.<a href="tqpixmap.html#fill">fill</a>(<a href="tqwidget.html#backgroundColor">backgroundColor</a>());
<a href="tqpainter.html">TQPainter</a> p(&pm);
<a name="x2763"></a> p.<a href="tqpainter.html#setFont">setFont</a>(<a href="tqwidget.html#font">font</a>());
p.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect());
int i = 0;
for (rowdata = data.<a href="tqptrlist.html#first">first</a>();
rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
<a href="tqcolor.html">TQColor</a> c;
c.<a href="tqcolor.html#setHsv">setHsv</a>( ( i * 255)/data.<a href="tqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect
p.<a href="tqpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c
int a = int(( rowdata[0].dbl * 360.0 ) / total * 16.0 + 0.5);
<a name="x2757"></a> p.<a href="tqpainter.html#drawPie">drawPie</a>( w/10, h/10, xd, yd, -apos, -a );
apos += a;
i++;
}
if (model.colType(1) == GraphModel::Label) {
double apos = (pieRotation-90)*M_PI/180;
for (rowdata = data.<a href="tqptrlist.html#first">first</a>();
rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>())
{
double a = rowdata[0].dbl * 360 / total * M_PI / 180;
int x = int(cos(apos+a/2)*w*5/16 + w/2 + 0.5);
int y = int(sin(apos+a/2)*h*5/16 + h/2 + 0.5);
// ### This causes a crash, so comment out for now
/*p.<a href="tqpainter.html#drawText">drawText</a>(x-w/8, y-h/8, w/4, h/4,
WordBreak|AlignCenter,
*rowdata[1].str);*/
apos += a;
}
}
<a href="tqpainter.html">TQPainter</a> p2(this);
p2.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect());
<a name="x2758"></a> p2.<a href="tqpainter.html#drawPixmap">drawPixmap</a>(0,0,pm);
}
void <a name="f568"></a>Graph::paintWait(TQPaintEvent*)
{
<a href="tqpainter.html">TQPainter</a> p(this);
p.<a href="tqpainter.html#drawText">drawText</a>(rect(), AlignCenter, "Loading...");
}
void Graph::<a href="tqwidget.html#paintEvent">paintEvent</a>(TQPaintEvent* event)
{
if (!model.nCols()) {
paintWait(event);
} else {
switch (style) {
case Pie:
paintPie(event);
break;
case Bar:
paintBar(event);
break;
}
}
}
void <a name="f569"></a>Graph::setStyleFromMenu(int id)
{
setStyle(Style(id-100));
}
const char* Graph::styleName[] = { "Pie", "Bar", 0 };
//
// Grapher is a subclass of TQNPInstance, and so it can be returned
// by GrapherPlugin::newInstance(). A TQNPInstance represents the
// plugin, distinctly from the plugin window.
//
// Grapher is also a GraphModel, because it loads graph data from
// the net. When Grapher creates a window in newWindow(), it creates
// a Graph widget to display the GraphModel that is the Grapher itself.
//
class Grapher : public <a href="qnpinstance.html">TQNPInstance</a>, GraphModel {
TQ_OBJECT
public:
// Create a Grapher - all Grapher plugins are created
// by one GrapherPlugin object.
//
Grapher();
~Grapher();
// We override this TQNPInstance function to create our
// own subclass of TQNPWidget, a Graph widget.
//
<a href="qnpwidget.html">TQNPWidget</a>* newWindow();
// We override this TQNPInstance function to process the
// incoming graph data.
//
int write(TQNPStream* /*str*/, int /*offset*/, int len, void* buffer);
private:
// Grapher is a GraphModel, so it implements the pure virtual
// functions of that class.
//
<a href="tqptrlist.html">TQPtrList</a><Datum>& graphData();
ColType colType(int col) const;
int nCols() const;
void consumeLine();
<a href="tqptrlist.html">TQPtrList</a><Datum> data;
<a href="tqbuffer.html">TQBuffer</a> line;
int ncols;
ColType *coltype;
private slots:
// Slots that are connected to the Graph menu items.
//
void aboutPlugin();
void aboutData();
};
<a name="f570"></a>Grapher::Grapher()
{
<a name="x2769"></a> data.<a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE);
ncols = 0;
<a name="x2743"></a> line.<a href="tqiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate);
}
Grapher::~Grapher()
{
}
TQPtrList<GraphModel::Datum>& <a name="f571"></a>Grapher::graphData()
{
return data;
}
GraphModel::ColType <a name="f572"></a>Grapher::colType(int col) const
{
return coltype[col];
}
int <a name="f573"></a>Grapher::nCols() const
{
return ncols;
}
<a name="x2751"></a>TQNPWidget* Grapher::<a href="qnpinstance.html#newWindow">newWindow</a>()
{
// Create a Graph - our subclass of TQNPWidget.
Graph *graph = new Graph(*this);
// Look at the arguments from the EMBED tag.
// GRAPHSTYLE chooses pie or bar
// FONTFAMILY and FONTSIZE choose the font
//
const char* style = <a href="qnpinstance.html#arg">arg</a>("GRAPHSTYLE");
if ( style ) graph-><a href="tqwidget.html#setStyle">setStyle</a>(style);
const char* fontfamily = <a href="qnpinstance.html#arg">arg</a>("FONTFAMILY");
const char* fontsize = <a href="qnpinstance.html#arg">arg</a>("FONTSIZE");
<a name="x2775"></a> int ptsize = fontsize ? atoi(fontsize) : graph-><a href="tqwidget.html#font">font</a>().pointSize();
if (fontfamily) graph-><a href="tqwidget.html#setFont">setFont</a>(TQFont(fontfamily, ptsize));
<a href="tqobject.html#connect">connect</a>(graph, TQ_SIGNAL(aboutPlugin()), this, TQ_SLOT(aboutPlugin()));
<a href="tqobject.html#connect">connect</a>(graph, TQ_SIGNAL(aboutData()), this, TQ_SLOT(aboutData()));
return graph;
}
void <a name="f574"></a>Grapher::consumeLine()
{
<a name="x2742"></a> line.<a href="tqiodevice.html#close">close</a>();
line.<a href="tqiodevice.html#open">open</a>(IO_ReadOnly);
<a href="tqtextstream.html">TQTextStream</a> ts( &line );
if (ncols == 0 ) {
ncols=0;
<a href="tqptrlist.html">TQPtrList</a><ColType> typelist;
typelist.<a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE);
do {
<a href="tqstring.html">TQString</a> typestr;
ts >> typestr >> ws;
ColType* t = 0;
if ( typestr == "num" ) {
t = new ColType(Numeric);
} else if ( typestr == "label" ) {
t = new ColType(Label);
}
<a name="x2770"></a> if (t) typelist.<a href="tqptrlist.html#append">append</a>(t);
<a name="x2774"></a> } while (!ts.<a href="tqtextstream.html#atEnd">atEnd</a>());
coltype = new ColType[ncols];
for (ColType* t = typelist.<a href="tqptrlist.html#first">first</a>(); t; t = typelist.<a href="tqptrlist.html#next">next</a>()) {
coltype[ncols++] = *t;
}
} else {
int col=0;
Datum *rowdata = new Datum[ncols];
while ( col < ncols && !ts.<a href="tqtextstream.html#atEnd">atEnd</a>() ) {
switch (coltype[col]) {
case Numeric: {
double value;
ts >> value >> ws;
rowdata[col].dbl = value;
break;
}
case Label: {
<a href="tqstring.html">TQString</a>* value = new <a href="tqstring.html">TQString</a>;
ts >> *value >> ws;
rowdata[col].str = value;
break;
}
}
col++;
}
data.<a href="tqptrlist.html#append">append</a>(rowdata);
}
line.<a href="tqiodevice.html#close">close</a>();
line.<a href="tqiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate);
}
<a name="x2752"></a>int Grapher::<a href="qnpinstance.html#write">write</a>(TQNPStream* /*str*/, int /*offset*/, int len, void* buffer)
{
// The browser calls this function when data is available on one
// of the streams the plugin has requested. Since we are only
// processing one stream - the URL in the SRC argument of the EMBED
// tag, we assume the TQNPStream is that one. Also, since we do not
// override TQNPInstance::writeReady(), we must accepts ALL the data
// that is sent to this function.
//
char* txt = (char*)buffer;
for (int i=0; i<len; i++) {
char ch = txt[i];
switch ( ch ) {
case '\n':
consumeLine();
break;
case '\r': // ignore;
break;
default:
<a name="x2744"></a> line.<a href="tqiodevice.html#putch">putch</a>(ch);
}
}
if ( <a href="qnpinstance.html#widget">widget</a>() )
<a href="qnpinstance.html#widget">widget</a>()->update();
return len;
}
void <a name="f575"></a>Grapher::aboutPlugin()
{
<a href="qnpinstance.html#getURL">getURL</a>( "http://doc.trolltech.com/netscape-plugin.html", "_blank" );
}
void <a name="f576"></a>Grapher::aboutData()
{
const char* page = <a href="qnpinstance.html#arg">arg</a>("DATAPAGE");
if (page)
<a href="qnpinstance.html#getURL">getURL</a>( page, "_blank" );
else
<a name="x2750"></a> TQMessageBox::<a href="ntqmessagebox.html#message">message</a>("Help", "No help for this data");
}
//
// GrapherPlugin is the start of everything. It is a TQNPlugin subclass,
// and it is responsible for describing the plugin to the browser, and
// creating instances of the plugin when it appears in web page.
//
class GrapherPlugin : public <a href="qnplugin.html">TQNPlugin</a> {
public:
GrapherPlugin()
{
}
<a href="qnpinstance.html">TQNPInstance</a>* newInstance()
{
// Make a new Grapher, our subclass of TQNPInstance.
return new Grapher;
}
const char* getMIMEDescription() const
{
// Describe the MIME types which this plugin can
// process. Just the concocted "application/x-graphable"
// type, with the "g1n" filename extension.
//
return "application/x-graphable:g1n:Graphable ASCII numeric data";
}
const char * getPluginNameString() const
{
// The name of the plugin. This is the title string used in
// the "About Plugins" page of the browser.
//
return "TQt-based Graph Plugin";
}
const char * getPluginDescriptionString() const
{
// A longer description of the plugin.
//
return "A TQt-based LiveConnected plug-in that graphs numeric data";
}
};
//
// Finally, we provide the implementation of TQNPlugin::create(), to
// provide our subclass of TQNPlugin.
//
TQNPlugin* TQNPlugin::create()
{
return new GrapherPlugin;
}
#include "grapher.moc"
</pre>
<p>See also <a href="nsplugin-examples.html">Netscape Plugin Examples</a>.
<!-- eof -->
<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright © 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
</table></div></address></body>
</html>
|
