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canvas-chart-example.html@ 190

Last change on this file since 190 was 190, checked in by rudi, 14 years ago
reference documentation added
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1	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2	<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/chart/chart.doc:1 -->
3	<html>
4	<head>
5	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6	<title>A Complete Canvas Application</title>
7	<style type="text/css"><!--
8	fn { margin-left: 1cm; text-indent: -1cm; }
9	a:link { color: #004faf; text-decoration: none }
10	a:visited { color: #672967; text-decoration: none }
11	body { background: #ffffff; color: black; }
12	--></style>
13	</head>
14	<body>
15
16	<table border="0" cellpadding="0" cellspacing="0" width="100%">
17	<tr bgcolor="#E5E5E5">
18	<td valign=center>
19	<a href="index.html">
20	<font color="#004faf">Home</font></a>
21	\| <a href="classes.html">
22	<font color="#004faf">All Classes</font></a>
23	\| <a href="mainclasses.html">
24	<font color="#004faf">Main Classes</font></a>
25	\| <a href="annotated.html">
26	<font color="#004faf">Annotated</font></a>
27	\| <a href="groups.html">
28	<font color="#004faf">Grouped Classes</font></a>
29	\| <a href="functions.html">
30	<font color="#004faf">Functions</font></a>
31	</td>
32	<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A Complete Canvas Application</h1>
33
34
35
36	<p>
37	<p> This is a complete example program with a main window, menus and
38	toolbars. The main widget is a <a href="qcanvas.html">QCanvas</a>, and this example
39	demonstrates basic canvas usage.
40
41	<p> <hr>
42	<p> Project file:
43	<p> <pre>TEMPLATE = app
44
45	CONFIG += warn_on
46
47	REQUIRES = full-config
48
49	HEADERS += element.h \
50	canvastext.h \
51	canvasview.h \
52	chartform.h \
53	optionsform.h \
54	setdataform.h
55	SOURCES += element.cpp \
56	canvasview.cpp \
57	chartform.cpp \
58	chartform_canvas.cpp \
59	chartform_files.cpp \
60	optionsform.cpp \
61	setdataform.cpp \
62	main.cpp
63	</pre>
64
65	<p> <hr>
66	<p> Header files:
67	<p> <pre>#ifndef ELEMENT_H
68	#define ELEMENT_H
69
70	#include <<a href="qcolor-h.html">qcolor.h</a>>
71	#include <<a href="qnamespace-h.html">qnamespace.h</a>>
72	#include <<a href="qstring-h.html">qstring.h</a>>
73	#include <<a href="qvaluevector-h.html">qvaluevector.h</a>>
74
75	class Element;
76
77	typedef QValueVector<Element> ElementVector;
78
79	/*
80	Elements are valid if they have a value which is > EPSILON.
81	*/
82	const double EPSILON = 0.0000001; // Must be > INVALID.
83
84
85	class Element
86	{
87	public:
88	enum { INVALID = -1 };
89	enum { NO_PROPORTION = -1 };
90	enum { MAX_PROPOINTS = 3 }; // One proportional point per chart type
91
92	Element( double value = INVALID, QColor valueColor = Qt::gray,
93	int valuePattern = Qt::SolidPattern,
94	const <a href="qstring.html">QString</a>& label = <a href="qstring.html#QString-null">QString::null</a>,
95	<a href="qcolor.html">QColor</a> labelColor = Qt::black ) {
96	init( value, valueColor, valuePattern, label, labelColor );
97	for ( int i = 0; i < MAX_PROPOINTS * 2; ++i )
98	m_propoints[i] = NO_PROPORTION;
99	}
100	~Element() {}
101
102	bool isValid() const { return m_value > EPSILON; }
103
104	double value() const { return m_value; }
105	<a href="qcolor.html">QColor</a> valueColor() const { return m_valueColor; }
106	int valuePattern() const { return m_valuePattern; }
107	<a href="qstring.html">QString</a> label() const { return m_label; }
108	<a href="qcolor.html">QColor</a> labelColor() const { return m_labelColor; }
109	double proX( int index ) const;
110	double proY( int index ) const;
111
112	void set( double value = INVALID, QColor valueColor = Qt::gray,
113	int valuePattern = Qt::SolidPattern,
114	const <a href="qstring.html">QString</a>& label = QString::null,
115	<a href="qcolor.html">QColor</a> labelColor = Qt::black ) {
116	init( value, valueColor, valuePattern, label, labelColor );
117	}
118	void setValue( double value ) { m_value = value; }
119	void setValueColor( <a href="qcolor.html">QColor</a> valueColor ) { m_valueColor = valueColor; }
120	void setValuePattern( int valuePattern );
121	void setLabel( const <a href="qstring.html">QString</a>& label ) { m_label = label; }
122	void setLabelColor( <a href="qcolor.html">QColor</a> labelColor ) { m_labelColor = labelColor; }
123	void setProX( int index, double value );
124	void setProY( int index, double value );
125
126	#ifdef Q_FULL_TEMPLATE_INSTANTIATION
127	// xlC 3.x workaround
128	Q_DUMMY_COMPARISON_OPERATOR(Element)
129	bool operator!=( const Element& e) const {
130	return ( !(e == *this) );
131	}
132	#endif
133
134	private:
135	void init( double value, QColor valueColor, int valuePattern,
136	const <a href="qstring.html">QString</a>& label, QColor labelColor );
137
138	double m_value;
139	<a href="qcolor.html">QColor</a> m_valueColor;
140	int m_valuePattern;
141	<a href="qstring.html">QString</a> m_label;
142	<a href="qcolor.html">QColor</a> m_labelColor;
143	double m_propoints[2 * MAX_PROPOINTS];
144	};
145
146
147	QTextStream &operator<<( <a href="qtextstream.html">QTextStream</a>&, const Element& );
148	QTextStream &operator>>( <a href="qtextstream.html">QTextStream</a>&, Element& );
149
150	#endif
151	</pre>
152
153	<pre>#ifndef CHARTFORM_H
154	#define CHARTFORM_H
155
156	#include "element.h"
157
158	#include <<a href="qmainwindow-h.html">qmainwindow.h</a>>
159	#include <<a href="qstringlist-h.html">qstringlist.h</a>>
160
161
162	class CanvasView;
163
164	class QAction;
165	class QCanvas;
166	class QFont;
167	class QPrinter;
168	class QString;
169
170
171	class ChartForm: public <a href="qmainwindow.html">QMainWindow</a>
172	{
173	<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
174	public:
175	enum { MAX_ELEMENTS = 100 };
176	enum { MAX_RECENTFILES = 9 }; // Must not exceed 9
177	enum ChartType { PIE, VERTICAL_BAR, HORIZONTAL_BAR };
178	enum AddValuesType { NO, YES, AS_PERCENTAGE };
179
180	ChartForm( const <a href="qstring.html">QString</a>& filename );
181	~ChartForm();
182
183	int chartType() { return m_chartType; }
184	void setChanged( bool changed = TRUE ) { m_changed = changed; }
185	void drawElements();
186
187	<a href="qpopupmenu.html">QPopupMenu</a> *optionsMenu; // Why public? See canvasview.cpp
188
189	protected:
190	virtual void closeEvent( <a href="qcloseevent.html">QCloseEvent</a> * );
191
192	private slots:
193	void fileNew();
194	void fileOpen();
195	void fileOpenRecent( int index );
196	void fileSave();
197	void fileSaveAs();
198	void fileSaveAsPixmap();
199	void filePrint();
200	void fileQuit();
201	void optionsSetData();
202	void updateChartType( <a href="qaction.html">QAction</a> *action );
203	void optionsSetFont();
204	void optionsSetOptions();
205	void helpHelp();
206	void helpAbout();
207	void helpAboutQt();
208	void saveOptions();
209
210	private:
211	void init();
212	void load( const <a href="qstring.html">QString</a>& filename );
213	bool okToClear();
214	void drawPieChart( const double scales[], double total, int count );
215	void drawVerticalBarChart( const double scales[], double total, int count );
216	void drawHorizontalBarChart( const double scales[], double total, int count );
217
218	<a href="qstring.html">QString</a> valueLabel( const <a href="qstring.html">QString</a>& label, double value, double total );
219	void updateRecentFiles( const <a href="qstring.html">QString</a>& filename );
220	void updateRecentFilesMenu();
221	void setChartType( ChartType chartType );
222
223	<a href="qpopupmenu.html">QPopupMenu</a> *fileMenu;
224	<a href="qaction.html">QAction</a> *optionsPieChartAction;
225	<a href="qaction.html">QAction</a> *optionsHorizontalBarChartAction;
226	<a href="qaction.html">QAction</a> *optionsVerticalBarChartAction;
227
228
229	<a href="qstring.html">QString</a> m_filename;
230	<a href="qstringlist.html">QStringList</a> m_recentFiles;
231	<a href="qcanvas.html">QCanvas</a> *m_canvas;
232	CanvasView *m_canvasView;
233	bool m_changed;
234	ElementVector m_elements;
235	<a href="qprinter.html">QPrinter</a> *m_printer;
236	ChartType m_chartType;
237	AddValuesType m_addValues;
238	int m_decimalPlaces;
239	<a href="qfont.html">QFont</a> m_font;
240	};
241
242	#endif
243	</pre>
244
245	<p> <hr>
246	<p> Implementation:
247	<p> <pre>#include "canvasview.h"
248	#include "chartform.h"
249	#include "optionsform.h"
250	#include "setdataform.h"
251
252	#include <<a href="qaction-h.html">qaction.h</a>>
253	#include <<a href="qapplication-h.html">qapplication.h</a>>
254	#include <<a href="qcombobox-h.html">qcombobox.h</a>>
255	#include <<a href="qfile-h.html">qfile.h</a>>
256	#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
257	#include <<a href="qfont-h.html">qfont.h</a>>
258	#include <<a href="qfontdialog-h.html">qfontdialog.h</a>>
259	#include <<a href="qmenubar-h.html">qmenubar.h</a>>
260	#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
261	#include <<a href="qpixmap-h.html">qpixmap.h</a>>
262	#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
263	#include <<a href="qprinter-h.html">qprinter.h</a>>
264	#include <<a href="qradiobutton-h.html">qradiobutton.h</a>>
265	#include <<a href="qsettings-h.html">qsettings.h</a>>
266	#include <<a href="qspinbox-h.html">qspinbox.h</a>>
267	#include <<a href="qstatusbar-h.html">qstatusbar.h</a>>
268	#include <<a href="qtoolbar-h.html">qtoolbar.h</a>>
269	#include <<a href="qtoolbutton-h.html">qtoolbutton.h</a>>
270
271	#include "images/file_new.xpm"
272	#include "images/file_open.xpm"
273	#include "images/file_save.xpm"
274	#include "images/file_print.xpm"
275	#include "images/options_setdata.xpm"
276	#include "images/options_setfont.xpm"
277	#include "images/options_setoptions.xpm"
278	#include "images/options_horizontalbarchart.xpm"
279	#include "images/options_piechart.xpm"
280	#include "images/options_verticalbarchart.xpm"
281
282
283	const <a href="qstring.html">QString</a> WINDOWS_REGISTRY = "/Trolltech/QtExamples";
284	const <a href="qstring.html">QString</a> APP_KEY = "/Chart/";
285
286
287	<a name="f596"></a>ChartForm::ChartForm( const <a href="qstring.html">QString</a>& filename )
288	: <a href="qmainwindow.html">QMainWindow</a>( 0, 0, WDestructiveClose )
289	{
290	<a href="qwidget.html#setIcon">setIcon</a>( QPixmap( options_piechart ) );
291
292	<a href="qaction.html">QAction</a> *fileNewAction;
293	<a href="qaction.html">QAction</a> *fileOpenAction;
294	<a href="qaction.html">QAction</a> *fileSaveAction;
295	<a href="qaction.html">QAction</a> *fileSaveAsAction;
296	<a href="qaction.html">QAction</a> *fileSaveAsPixmapAction;
297	<a href="qaction.html">QAction</a> *filePrintAction;
298	<a href="qaction.html">QAction</a> *fileQuitAction;
299	<a href="qaction.html">QAction</a> *optionsSetDataAction;
300	<a href="qaction.html">QAction</a> *optionsSetFontAction;
301	<a href="qaction.html">QAction</a> *optionsSetOptionsAction;
302
303	fileNewAction = new <a href="qaction.html">QAction</a>(
304	"New Chart", QPixmap( file_new ),
305	"&New", CTRL+Key_N, this, "new" );
306	<a name="x2869"></a> <a href="qobject.html#connect">connect</a>( fileNewAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ), this, SLOT( fileNew() ) );
307
308	fileOpenAction = new <a href="qaction.html">QAction</a>(
309	"Open Chart", QPixmap( file_open ),
310	"&Open...", CTRL+Key_O, this, "open" );
311	<a href="qobject.html#connect">connect</a>( fileOpenAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ), this, SLOT( fileOpen() ) );
312
313	fileSaveAction = new <a href="qaction.html">QAction</a>(
314	"Save Chart", QPixmap( file_save ),
315	"&Save", CTRL+Key_S, this, "save" );
316	<a href="qobject.html#connect">connect</a>( fileSaveAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ), this, SLOT( fileSave() ) );
317
318	fileSaveAsAction = new <a href="qaction.html">QAction</a>(
319	"Save Chart As", QPixmap( file_save ),
320	"Save &As...", 0, this, "save as" );
321	<a href="qobject.html#connect">connect</a>( fileSaveAsAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
322	this, SLOT( fileSaveAs() ) );
323
324	fileSaveAsPixmapAction = new <a href="qaction.html">QAction</a>(
325	"Save Chart As Bitmap", QPixmap( file_save ),
326	"Save As &Bitmap...", CTRL+Key_B, this, "save as bitmap" );
327	<a href="qobject.html#connect">connect</a>( fileSaveAsPixmapAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
328	this, SLOT( fileSaveAsPixmap() ) );
329
330	filePrintAction = new <a href="qaction.html">QAction</a>(
331	"Print Chart", QPixmap( file_print ),
332	"&Print Chart...", CTRL+Key_P, this, "print chart" );
333	<a href="qobject.html#connect">connect</a>( filePrintAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
334	this, SLOT( filePrint() ) );
335
336	optionsSetDataAction = new <a href="qaction.html">QAction</a>(
337	"Set Data", QPixmap( options_setdata ),
338	"Set &Data...", CTRL+Key_D, this, "set data" );
339	<a href="qobject.html#connect">connect</a>( optionsSetDataAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
340	this, SLOT( optionsSetData() ) );
341
342
343	<a href="qactiongroup.html">QActionGroup</a> *chartGroup = new <a href="qactiongroup.html">QActionGroup</a>( this ); // Connected later
344	<a name="x2874"></a> chartGroup-><a href="qactiongroup.html#setExclusive">setExclusive</a>( TRUE );
345
346	optionsPieChartAction = new <a href="qaction.html">QAction</a>(
347	"Pie Chart", QPixmap( options_piechart ),
348	"&Pie Chart", CTRL+Key_I, chartGroup, "pie chart" );
349	<a name="x2872"></a> optionsPieChartAction-><a href="qaction.html#setToggleAction">setToggleAction</a>( TRUE );
350
351	optionsHorizontalBarChartAction = new <a href="qaction.html">QAction</a>(
352	"Horizontal Bar Chart", QPixmap( options_horizontalbarchart ),
353	"&Horizontal Bar Chart", CTRL+Key_H, chartGroup,
354	"horizontal bar chart" );
355	optionsHorizontalBarChartAction-><a href="qaction.html#setToggleAction">setToggleAction</a>( TRUE );
356
357	optionsVerticalBarChartAction = new <a href="qaction.html">QAction</a>(
358	"Vertical Bar Chart", QPixmap( options_verticalbarchart ),
359	"&Vertical Bar Chart", CTRL+Key_V, chartGroup, "Vertical bar chart" );
360	optionsVerticalBarChartAction-><a href="qaction.html#setToggleAction">setToggleAction</a>( TRUE );
361
362
363	optionsSetFontAction = new <a href="qaction.html">QAction</a>(
364	"Set Font", QPixmap( options_setfont ),
365	"Set &Font...", CTRL+Key_F, this, "set font" );
366	<a href="qobject.html#connect">connect</a>( optionsSetFontAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
367	this, SLOT( optionsSetFont() ) );
368
369	optionsSetOptionsAction = new <a href="qaction.html">QAction</a>(
370	"Set Options", QPixmap( options_setoptions ),
371	"Set &Options...", 0, this, "set options" );
372	<a href="qobject.html#connect">connect</a>( optionsSetOptionsAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ),
373	this, SLOT( optionsSetOptions() ) );
374
375	fileQuitAction = new <a href="qaction.html">QAction</a>( "Quit", "&Quit", CTRL+Key_Q, this, "quit" );
376	<a href="qobject.html#connect">connect</a>( fileQuitAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ), this, SLOT( fileQuit() ) );
377
378
379	<a href="qtoolbar.html">QToolBar</a>* fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
380	<a name="x2895"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" );
381	<a name="x2870"></a> fileNewAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
382	fileOpenAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
383	fileSaveAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
384	<a name="x2894"></a> fileTools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
385	filePrintAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
386
387	<a href="qtoolbar.html">QToolBar</a> *optionsTools = new <a href="qtoolbar.html">QToolBar</a>( this, "options operations" );
388	optionsTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "Options Operations" );
389	optionsSetDataAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
390	optionsTools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
391	optionsPieChartAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
392	optionsHorizontalBarChartAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
393	optionsVerticalBarChartAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
394	optionsTools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
395	optionsSetFontAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
396	optionsTools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
397	optionsSetOptionsAction-><a href="qaction.html#addTo">addTo</a>( optionsTools );
398
399	fileMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
400	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&File", fileMenu );
401	fileNewAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
402	fileOpenAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
403	fileSaveAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
404	fileSaveAsAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
405	fileMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
406	fileSaveAsPixmapAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
407	fileMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
408	filePrintAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
409	fileMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
410	fileQuitAction-><a href="qaction.html#addTo">addTo</a>( fileMenu );
411
412	optionsMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
413	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&Options", optionsMenu );
414	optionsSetDataAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
415	optionsMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
416	optionsPieChartAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
417	optionsHorizontalBarChartAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
418	optionsVerticalBarChartAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
419	optionsMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
420	optionsSetFontAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
421	optionsMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
422	optionsSetOptionsAction-><a href="qaction.html#addTo">addTo</a>( optionsMenu );
423
424	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertSeparator();
425
426	<a href="qpopupmenu.html">QPopupMenu</a> *helpMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
427	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&Help", helpMenu );
428	helpMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Help", this, SLOT(helpHelp()), Key_F1 );
429	helpMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&About", this, SLOT(helpAbout()) );
430	helpMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "About &Qt", this, SLOT(helpAboutQt()) );
431
432
433	m_printer = 0;
434	m_elements.resize( MAX_ELEMENTS );
435
436	<a href="qsettings.html">QSettings</a> settings;
437	<a name="x2890"></a> settings.<a href="qsettings.html#insertSearchPath">insertSearchPath</a>( QSettings::Windows, WINDOWS_REGISTRY );
438	int windowWidth = settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "WindowWidth", 460 );
439	int windowHeight = settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "WindowHeight", 530 );
440	int windowX = settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "WindowX", -1 );
441	int windowY = settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "WindowY", -1 );
442	setChartType( ChartType(
443	settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "ChartType", int(PIE) ) ) );
444	m_addValues = AddValuesType(
445	settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "AddValues", int(NO) ));
446	m_decimalPlaces = settings.<a href="qsettings.html#readNumEntry">readNumEntry</a>( APP_KEY + "Decimals", 2 );
447	m_font = QFont( "Helvetica", 18, QFont::Bold );
448	m_font.fromString(
449	settings.<a href="qsettings.html#readEntry">readEntry</a>( APP_KEY + "Font", m_font.toString() ) );
450	for ( int i = 0; i < MAX_RECENTFILES; ++i ) {
451	<a href="qstring.html">QString</a> filename = settings.<a href="qsettings.html#readEntry">readEntry</a>( APP_KEY + "File" +
452	<a name="x2893"></a> QString::<a href="qstring.html#number">number</a>( i + 1 ) );
453	<a name="x2892"></a> if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() )
454	m_recentFiles.push_back( filename );
455	}
456	if ( m_recentFiles.count() )
457	updateRecentFilesMenu();
458
459
460	// Connect after we've set the chart type on so we don't call
461	// drawElements() prematurely.
462	<a name="x2873"></a> <a href="qobject.html#connect">connect</a>( chartGroup, SIGNAL( <a href="qactiongroup.html#selected">selected</a>(QAction*) ),
463	this, SLOT( updateChartType(QAction*) ) );
464
465	<a href="qwidget.html#resize">resize</a>( windowWidth, windowHeight );
466	if ( windowX != -1 \|\| windowY != -1 )
467	<a href="qwidget.html#move">move</a>( windowX, windowY );
468
469	m_canvas = new <a href="qcanvas.html">QCanvas</a>( this );
470	<a name="x2876"></a> m_canvas-><a href="qcanvas.html#resize">resize</a>( <a href="qwidget.html#width">width</a>(), height() );
471	m_canvasView = new CanvasView( m_canvas, &m_elements, this );
472	<a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( m_canvasView );
473	m_canvasView-><a href="qwidget.html#show">show</a>();
474
475	if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() )
476	load( filename );
477	else {
478	init();
479	m_elements[0].set( 20, red, 14, "Red" );
480	m_elements[1].set( 70, cyan, 2, "Cyan", darkGreen );
481	m_elements[2].set( 35, blue, 11, "Blue" );
482	m_elements[3].set( 55, yellow, 1, "Yellow", darkBlue );
483	m_elements[4].set( 80, magenta, 1, "Magenta" );
484	drawElements();
485	}
486
487	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Ready", 2000 );
488	}
489
490
491	ChartForm::~ChartForm()
492	{
493	delete m_printer;
494	}
495
496
497	void <a name="f597"></a>ChartForm::init()
498	{
499	<a href="qwidget.html#setCaption">setCaption</a>( "Chart" );
500	m_filename = QString::null;
501	m_changed = FALSE;
502
503	m_elements[0] = Element( Element::INVALID, red );
504	m_elements[1] = Element( Element::INVALID, cyan );
505	m_elements[2] = Element( Element::INVALID, blue );
506	m_elements[3] = Element( Element::INVALID, yellow );
507	m_elements[4] = Element( Element::INVALID, green );
508	m_elements[5] = Element( Element::INVALID, magenta );
509	m_elements[6] = Element( Element::INVALID, darkYellow );
510	m_elements[7] = Element( Element::INVALID, darkRed );
511	m_elements[8] = Element( Element::INVALID, darkCyan );
512	m_elements[9] = Element( Element::INVALID, darkGreen );
513	m_elements[10] = Element( Element::INVALID, darkMagenta );
514	m_elements[11] = Element( Element::INVALID, darkBlue );
515	for ( int i = 12; i < MAX_ELEMENTS; ++i ) {
516	double x = (double(i) / MAX_ELEMENTS) * 360;
517	int y = (int(x * 256) % 105) + 151;
518	int z = ((i * 17) % 105) + 151;
519	m_elements[i] = Element( Element::INVALID, QColor( int(x), y, z, QColor::Hsv ) );
520	}
521	}
522
523	<a name="x2896"></a>void ChartForm::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a> * )
524	{
525	fileQuit();
526	}
527
528
529	void <a name="f598"></a>ChartForm::fileNew()
530	{
531	if ( okToClear() ) {
532	init();
533	drawElements();
534	}
535	}
536
537
538	void <a name="f599"></a>ChartForm::fileOpen()
539	{
540	if ( !okToClear() )
541	return;
542
543	<a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>(
544	QString::null, "Charts (*.cht)", this,
545	"file open", "Chart -- File Open" );
546	if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() )
547	load( filename );
548	else
549	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "File Open abandoned", 2000 );
550	}
551
552
553	void <a name="f600"></a>ChartForm::fileSaveAs()
554	{
555	<a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(
556	QString::null, "Charts (*.cht)", this,
557	"file save as", "Chart -- File Save As" );
558	if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
559	int answer = 0;
560	<a name="x2878"></a> if ( QFile::<a href="qfile.html#exists">exists</a>( filename ) )
561	<a name="x2889"></a> answer = QMessageBox::<a href="qmessagebox.html#warning">warning</a>(
562	this, "Chart -- Overwrite File",
563	QString( "Overwrite\n\'%1\'?" ).
564	arg( filename ),
565	"&Yes", "&No", QString::null, 1, 1 );
566	if ( answer == 0 ) {
567	m_filename = filename;
568	updateRecentFiles( filename );
569	fileSave();
570	return;
571	}
572	}
573	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Saving abandoned", 2000 );
574	}
575
576
577	void <a name="f601"></a>ChartForm::fileOpenRecent( int index )
578	{
579	if ( !okToClear() )
580	return;
581
582	load( m_recentFiles[index] );
583	}
584
585
586	void <a name="f602"></a>ChartForm::updateRecentFiles( const <a href="qstring.html">QString</a>& filename )
587	{
588	if ( m_recentFiles.find( filename ) != m_recentFiles.end() )
589	return;
590
591	m_recentFiles.push_back( filename );
592	if ( m_recentFiles.count() > MAX_RECENTFILES )
593	m_recentFiles.pop_front();
594
595	updateRecentFilesMenu();
596	}
597
598
599	void <a name="f603"></a>ChartForm::updateRecentFilesMenu()
600	{
601	for ( int i = 0; i < MAX_RECENTFILES; ++i ) {
602	<a name="x2882"></a> if ( fileMenu-><a href="qmenudata.html#findItem">findItem</a>( i ) )
603	<a name="x2885"></a> fileMenu-><a href="qmenudata.html#removeItem">removeItem</a>( i );
604	if ( i < int(m_recentFiles.count()) )
605	fileMenu-><a href="qmenudata.html#insertItem">insertItem</a>( QString( "&%1 %2" ).
606	arg( i + 1 ).arg( m_recentFiles[i] ),
607	this, SLOT( fileOpenRecent(int) ),
608	0, i );
609	}
610	}
611
612
613	void <a name="f604"></a>ChartForm::fileQuit()
614	{
615	if ( okToClear() ) {
616	saveOptions();
617	<a name="x2875"></a> qApp-><a href="qapplication.html#exit">exit</a>( 0 );
618	}
619	}
620
621
622	bool <a name="f605"></a>ChartForm::okToClear()
623	{
624	if ( m_changed ) {
625	<a href="qstring.html">QString</a> msg;
626	if ( m_filename.isEmpty() )
627	msg = "Unnamed chart ";
628	else
629	msg = QString( "Chart '%1'\n" ).arg( m_filename );
630	msg += "has been changed.";
631
632	int x = QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Chart -- Unsaved Changes",
633	msg, "&Save", "Cancel", "&Abandon",
634	0, 1 );
635	switch( x ) {
636	case 0: // Save
637	fileSave();
638	break;
639	case 1: // Cancel
640	default:
641	return FALSE;
642	case 2: // Abandon
643	break;
644	}
645	}
646
647	return TRUE;
648	}
649
650
651	void <a name="f606"></a>ChartForm::saveOptions()
652	{
653	<a href="qsettings.html">QSettings</a> settings;
654	settings.<a href="qsettings.html#insertSearchPath">insertSearchPath</a>( QSettings::Windows, WINDOWS_REGISTRY );
655	<a name="x2891"></a> settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowWidth", width() );
656	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowHeight", height() );
657	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowX", x() );
658	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowY", y() );
659	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "ChartType", int(m_chartType) );
660	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "AddValues", int(m_addValues) );
661	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "Decimals", m_decimalPlaces );
662	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "Font", m_font.toString() );
663	for ( int i = 0; i < int(m_recentFiles.count()); ++i )
664	settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "File" + QString::number( i + 1 ),
665	m_recentFiles[i] );
666	}
667
668
669	void <a name="f607"></a>ChartForm::optionsSetData()
670	{
671	SetDataForm *setDataForm = new SetDataForm( &m_elements, m_decimalPlaces, this );
672	<a name="x2877"></a> if ( setDataForm-><a href="qdialog.html#exec">exec</a>() ) {
673	m_changed = TRUE;
674	drawElements();
675	}
676	delete setDataForm;
677	}
678
679
680	void <a name="f608"></a>ChartForm::setChartType( ChartType chartType )
681	{
682	m_chartType = chartType;
683	switch ( m_chartType ) {
684	case PIE:
685	<a name="x2871"></a> optionsPieChartAction-><a href="qaction.html#setOn">setOn</a>( TRUE );
686	break;
687	case VERTICAL_BAR:
688	optionsVerticalBarChartAction-><a href="qaction.html#setOn">setOn</a>( TRUE );
689	break;
690	case HORIZONTAL_BAR:
691	optionsHorizontalBarChartAction-><a href="qaction.html#setOn">setOn</a>( TRUE );
692	break;
693	}
694	}
695
696
697	void <a name="f609"></a>ChartForm::updateChartType( <a href="qaction.html">QAction</a> *action )
698	{
699	if ( action == optionsPieChartAction ) {
700	m_chartType = PIE;
701	}
702	else if ( action == optionsHorizontalBarChartAction ) {
703	m_chartType = HORIZONTAL_BAR;
704	}
705	else if ( action == optionsVerticalBarChartAction ) {
706	m_chartType = VERTICAL_BAR;
707	}
708
709	drawElements();
710	}
711
712
713	void <a name="f610"></a>ChartForm::optionsSetFont()
714	{
715	bool ok;
716	<a name="x2881"></a> <a href="qfont.html">QFont</a> font = QFontDialog::<a href="qfontdialog.html#getFont">getFont</a>( &ok, m_font, this );
717	if ( ok ) {
718	m_font = font;
719	drawElements();
720	}
721	}
722
723
724	void <a name="f611"></a>ChartForm::optionsSetOptions()
725	{
726	OptionsForm *optionsForm = new OptionsForm( this );
727	optionsForm->chartTypeComboBox->setCurrentItem( m_chartType );
728	optionsForm-><a href="qwidget.html#setFont">setFont</a>( m_font );
729	switch ( m_addValues ) {
730	case NO:
731	optionsForm->noRadioButton->setChecked( TRUE );
732	break;
733	case YES:
734	optionsForm->yesRadioButton->setChecked( TRUE );
735	break;
736	case AS_PERCENTAGE:
737	optionsForm->asPercentageRadioButton->setChecked( TRUE );
738	break;
739	}
740	optionsForm->decimalPlacesSpinBox->setValue( m_decimalPlaces );
741	if ( optionsForm-><a href="qdialog.html#exec">exec</a>() ) {
742	setChartType( ChartType(
743	optionsForm->chartTypeComboBox->currentItem()) );
744	<a name="x2897"></a> m_font = optionsForm-><a href="qwidget.html#font">font</a>();
745	if ( optionsForm->noRadioButton->isChecked() )
746	m_addValues = NO;
747	else if ( optionsForm->yesRadioButton->isChecked() )
748	m_addValues = YES;
749	else if ( optionsForm->asPercentageRadioButton->isChecked() )
750	m_addValues = AS_PERCENTAGE;
751	m_decimalPlaces = optionsForm->decimalPlacesSpinBox->value();
752	drawElements();
753	}
754	delete optionsForm;
755	}
756
757
758	void <a name="f612"></a>ChartForm::helpHelp()
759	{
760	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Help is not implemented yet", 2000 );
761	}
762
763
764	void <a name="f613"></a>ChartForm::helpAbout()
765	{
766	<a name="x2886"></a> QMessageBox::<a href="qmessagebox.html#about">about</a>( this, "Chart -- About",
767	"<center><h1><font color=blue>Chart<font></h1></center>"
768	"<p>Chart your data with <i>chart</i>.</p>"
769	);
770	}
771
772
773	void <a name="f614"></a>ChartForm::helpAboutQt()
774	{
775	<a name="x2887"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Chart -- About Qt" );
776	}
777
778	</pre>
779
780	<p> <hr>
781	<p> Main:
782	<p> <pre>#include <<a href="qapplication-h.html">qapplication.h</a>>
783	#include "chartform.h"
784
785
786	int main( int argc, char *argv[] )
787	{
788	<a href="qapplication.html">QApplication</a> app( argc, argv );
789
790	<a href="qstring.html">QString</a> filename;
791	<a name="x2900"></a> if ( app.<a href="qapplication.html#argc">argc</a>() > 1 ) {
792	<a name="x2901"></a> filename = app.<a href="qapplication.html#argv">argv</a>()[1];
793	<a name="x2904"></a> if ( !filename.<a href="qstring.html#endsWith">endsWith</a>( ".cht" ) )
794	filename = QString::null;
795	}
796
797	ChartForm *cf = new ChartForm( filename );
798	app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
799	cf-><a href="qwidget.html#show">show</a>();
800
801	return app.<a href="qapplication.html#exec">exec</a>();
802	}
803	</pre>
804
805	<p> <p>See also <a href="step-by-step-examples.html">Step-by-step Examples</a>.
806
807	<!-- eof -->
808	<p><address><hr><div align=center>
809	<table width=100% cellspacing=0 border=0><tr>
810	<td>Copyright © 2007
811	<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
812	<td align=right><div align=right>Qt 3.3.8</div>
813	</table></div></address></body>
814	</html>

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