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This is a complete example program with a main window, menus and toolbars. The main widget is a QCanvas, and this example demonstrates basic canvas usage.
Project file:
TEMPLATE = app
CONFIG += warn_on
HEADERS += element.h \
canvastext.h \
canvasview.h \
chartform.h \
optionsform.h \
setdataform.h
SOURCES += element.cpp \
canvasview.cpp \
chartform.cpp \
chartform_canvas.cpp \
chartform_files.cpp \
optionsform.cpp \
setdataform.cpp \
main.cpp
Header files:
#ifndef ELEMENT_H
#define ELEMENT_H
#include <qcolor.h>
#include <qnamespace.h>
#include <qstring.h>
#include <qvaluevector.h>
class Element;
typedef QValueVector<Element> ElementVector;
/*
Elements are valid if they have a value which is > EPSILON.
*/
const double EPSILON = 0.0000001; // Must be > INVALID.
class Element
{
public:
enum { INVALID = -1 };
enum { NO_PROPORTION = -1 };
enum { MAX_PROPOINTS = 3 }; // One proportional point per chart type
Element( double value = INVALID, QColor valueColor = Qt::gray,
int valuePattern = Qt::SolidPattern,
const QString& label = QString::null,
QColor labelColor = Qt::black ) {
init( value, valueColor, valuePattern, label, labelColor );
for ( int i = 0; i < MAX_PROPOINTS * 2; ++i )
m_propoints[i] = NO_PROPORTION;
}
~Element() {}
bool isValid() const { return m_value > EPSILON; }
double value() const { return m_value; }
QColor valueColor() const { return m_valueColor; }
int valuePattern() const { return m_valuePattern; }
QString label() const { return m_label; }
QColor labelColor() const { return m_labelColor; }
double proX( int index ) const;
double proY( int index ) const;
void set( double value = INVALID, QColor valueColor = Qt::gray,
int valuePattern = Qt::SolidPattern,
const QString& label = QString::null,
QColor labelColor = Qt::black ) {
init( value, valueColor, valuePattern, label, labelColor );
}
void setValue( double value ) { m_value = value; }
void setValueColor( QColor valueColor ) { m_valueColor = valueColor; }
void setValuePattern( int valuePattern );
void setLabel( const QString& label ) { m_label = label; }
void setLabelColor( QColor labelColor ) { m_labelColor = labelColor; }
void setProX( int index, double value );
void setProY( int index, double value );
private:
void init( double value, QColor valueColor, int valuePattern,
const QString& label, QColor labelColor );
double m_value;
QColor m_valueColor;
int m_valuePattern;
QString m_label;
QColor m_labelColor;
double m_propoints[2 * MAX_PROPOINTS];
};
Q_EXPORT QTextStream &operator<<( QTextStream&, const Element& );
Q_EXPORT QTextStream &operator>>( QTextStream&, Element& );
#endif
#ifndef CHARTFORM_H
#define CHARTFORM_H
#include "element.h"
#include <qmainwindow.h>
#include <qstringlist.h>
class CanvasView;
class QAction;
class QCanvas;
class QFont;
class QPrinter;
class QString;
class ChartForm: public QMainWindow
{
Q_OBJECT
public:
enum { MAX_ELEMENTS = 100 };
enum { MAX_RECENTFILES = 9 }; // Must not exceed 9
enum ChartType { PIE, VERTICAL_BAR, HORIZONTAL_BAR };
enum AddValuesType { NO, YES, AS_PERCENTAGE };
ChartForm( const QString& filename );
~ChartForm();
int chartType() { return m_chartType; }
void setChanged( bool changed = true ) { m_changed = changed; }
void drawElements();
QPopupMenu *optionsMenu; // Why public? See canvasview.cpp
private slots:
void fileNew();
void fileOpen();
void fileOpenRecent( int index );
void fileSave();
void fileSaveAs();
void fileSaveAsPixmap();
void filePrint();
void fileQuit();
void optionsSetData();
void updateChartType( QAction *action );
void optionsSetFont();
void optionsSetOptions();
void helpHelp();
void helpAbout();
void helpAboutQt();
void saveOptions();
private:
void init();
void load( const QString& filename );
bool okToClear();
void drawPieChart( const double scales[], double total, int count );
void drawVerticalBarChart( const double scales[], double total, int count );
void drawHorizontalBarChart( const double scales[], double total, int count );
QString valueLabel( const QString& label, double value, double total );
void updateRecentFiles( const QString& filename );
void updateRecentFilesMenu();
void setChartType( ChartType chartType );
QPopupMenu *fileMenu;
QAction *optionsPieChartAction;
QAction *optionsHorizontalBarChartAction;
QAction *optionsVerticalBarChartAction;
QString m_filename;
QStringList m_recentFiles;
QCanvas *m_canvas;
CanvasView *m_canvasView;
bool m_changed;
ElementVector m_elements;
QPrinter *m_printer;
ChartType m_chartType;
AddValuesType m_addValues;
int m_decimalPlaces;
QFont m_font;
};
#endif
Implementation:
#include "canvasview.h"
#include "chartform.h"
#include "optionsform.h"
#include "setdataform.h"
#include <qaction.h>
#include <qapplication.h>
#include <qcombobox.h>
#include <qfile.h>
#include <qfiledialog.h>
#include <qfont.h>
#include <qfontdialog.h>
#include <qmenubar.h>
#include <qmessagebox.h>
#include <qpixmap.h>
#include <qpopupmenu.h>
#include <qprinter.h>
#include <qradiobutton.h>
#include <qsettings.h>
#include <qspinbox.h>
#include <qstatusbar.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include "images/file_new.xpm"
#include "images/file_open.xpm"
#include "images/file_save.xpm"
#include "images/file_print.xpm"
#include "images/options_setdata.xpm"
#include "images/options_setfont.xpm"
#include "images/options_setoptions.xpm"
#include "images/options_horizontalbarchart.xpm"
#include "images/options_piechart.xpm"
#include "images/options_verticalbarchart.xpm"
const QString WINDOWS_REGISTRY = "/QtExamples";
const QString APP_KEY = "/Chart/";
ChartForm::ChartForm( const QString& filename )
: QMainWindow( 0, 0, WDestructiveClose )
{
setIcon( QPixmap( options_piechart ) );
QAction *fileNewAction;
QAction *fileOpenAction;
QAction *fileSaveAction;
QAction *fileSaveAsAction;
QAction *fileSaveAsPixmapAction;
QAction *filePrintAction;
QAction *fileQuitAction;
QAction *optionsSetDataAction;
QAction *optionsSetFontAction;
QAction *optionsSetOptionsAction;
fileNewAction = new QAction(
"New Chart", QPixmap( file_new ),
"&New", CTRL+Key_N, this, "new" );
connect( fileNewAction, SIGNAL( activated() ), this, SLOT( fileNew() ) );
fileOpenAction = new QAction(
"Open Chart", QPixmap( file_open ),
"&Open...", CTRL+Key_O, this, "open" );
connect( fileOpenAction, SIGNAL( activated() ), this, SLOT( fileOpen() ) );
fileSaveAction = new QAction(
"Save Chart", QPixmap( file_save ),
"&Save", CTRL+Key_S, this, "save" );
connect( fileSaveAction, SIGNAL( activated() ), this, SLOT( fileSave() ) );
fileSaveAsAction = new QAction(
"Save Chart As", QPixmap( file_save ),
"Save &As...", 0, this, "save as" );
connect( fileSaveAsAction, SIGNAL( activated() ),
this, SLOT( fileSaveAs() ) );
fileSaveAsPixmapAction = new QAction(
"Save Chart As Bitmap", QPixmap( file_save ),
"Save As &Bitmap...", CTRL+Key_B, this, "save as bitmap" );
connect( fileSaveAsPixmapAction, SIGNAL( activated() ),
this, SLOT( fileSaveAsPixmap() ) );
filePrintAction = new QAction(
"Print Chart", QPixmap( file_print ),
"&Print Chart...", CTRL+Key_P, this, "print chart" );
connect( filePrintAction, SIGNAL( activated() ),
this, SLOT( filePrint() ) );
optionsSetDataAction = new QAction(
"Set Data", QPixmap( options_setdata ),
"Set &Data...", CTRL+Key_D, this, "set data" );
connect( optionsSetDataAction, SIGNAL( activated() ),
this, SLOT( optionsSetData() ) );
QActionGroup *chartGroup = new QActionGroup( this ); // Connected later
chartGroup->setExclusive( true );
optionsPieChartAction = new QAction(
"Pie Chart", QPixmap( options_piechart ),
"&Pie Chart", CTRL+Key_I, chartGroup, "pie chart" );
optionsPieChartAction->setToggleAction( true );
optionsHorizontalBarChartAction = new QAction(
"Horizontal Bar Chart", QPixmap( options_horizontalbarchart ),
"&Horizontal Bar Chart", CTRL+Key_H, chartGroup,
"horizontal bar chart" );
optionsHorizontalBarChartAction->setToggleAction( true );
optionsVerticalBarChartAction = new QAction(
"Vertical Bar Chart", QPixmap( options_verticalbarchart ),
"&Vertical Bar Chart", CTRL+Key_V, chartGroup, "Vertical bar chart" );
optionsVerticalBarChartAction->setToggleAction( true );
optionsSetFontAction = new QAction(
"Set Font", QPixmap( options_setfont ),
"Set &Font...", CTRL+Key_F, this, "set font" );
connect( optionsSetFontAction, SIGNAL( activated() ),
this, SLOT( optionsSetFont() ) );
optionsSetOptionsAction = new QAction(
"Set Options", QPixmap( options_setoptions ),
"Set &Options...", 0, this, "set options" );
connect( optionsSetOptionsAction, SIGNAL( activated() ),
this, SLOT( optionsSetOptions() ) );
fileQuitAction = new QAction( "Quit", "&Quit", CTRL+Key_Q, this, "quit" );
connect( fileQuitAction, SIGNAL( activated() ), this, SLOT( fileQuit() ) );
QToolBar* fileTools = new QToolBar( this, "file operations" );
fileTools->setLabel( "File Operations" );
fileNewAction->addTo( fileTools );
fileOpenAction->addTo( fileTools );
fileSaveAction->addTo( fileTools );
fileTools->addSeparator();
filePrintAction->addTo( fileTools );
QToolBar *optionsTools = new QToolBar( this, "options operations" );
optionsTools->setLabel( "Options Operations" );
optionsSetDataAction->addTo( optionsTools );
optionsTools->addSeparator();
optionsPieChartAction->addTo( optionsTools );
optionsHorizontalBarChartAction->addTo( optionsTools );
optionsVerticalBarChartAction->addTo( optionsTools );
optionsTools->addSeparator();
optionsSetFontAction->addTo( optionsTools );
optionsTools->addSeparator();
optionsSetOptionsAction->addTo( optionsTools );
fileMenu = new QPopupMenu( this );
menuBar()->insertItem( "&File", fileMenu );
fileNewAction->addTo( fileMenu );
fileOpenAction->addTo( fileMenu );
fileSaveAction->addTo( fileMenu );
fileSaveAsAction->addTo( fileMenu );
fileMenu->insertSeparator();
fileSaveAsPixmapAction->addTo( fileMenu );
fileMenu->insertSeparator();
filePrintAction->addTo( fileMenu );
fileMenu->insertSeparator();
fileQuitAction->addTo( fileMenu );
fileMenu->insertSeparator();
optionsMenu = new QPopupMenu( this );
menuBar()->insertItem( "&Options", optionsMenu );
optionsSetDataAction->addTo( optionsMenu );
optionsMenu->insertSeparator();
optionsPieChartAction->addTo( optionsMenu );
optionsHorizontalBarChartAction->addTo( optionsMenu );
optionsVerticalBarChartAction->addTo( optionsMenu );
optionsMenu->insertSeparator();
optionsSetFontAction->addTo( optionsMenu );
optionsMenu->insertSeparator();
optionsSetOptionsAction->addTo( optionsMenu );
menuBar()->insertSeparator();
QPopupMenu *helpMenu = new QPopupMenu( this );
menuBar()->insertItem( "&Help", helpMenu );
helpMenu->insertItem( "&Help", this, SLOT(helpHelp()), Key_F1 );
helpMenu->insertItem( "&About", this, SLOT(helpAbout()) );
helpMenu->insertItem( "About &Qt", this, SLOT(helpAboutQt()) );
m_printer = 0;
m_elements.resize( MAX_ELEMENTS );
QSettings settings;
settings.insertSearchPath( QSettings::Windows, WINDOWS_REGISTRY );
int windowWidth = settings.readNumEntry( APP_KEY + "WindowWidth", 460 );
int windowHeight = settings.readNumEntry( APP_KEY + "WindowHeight", 530 );
int windowX = settings.readNumEntry( APP_KEY + "WindowX", 0 );
int windowY = settings.readNumEntry( APP_KEY + "WindowY", 0 );
setChartType( ChartType(
settings.readNumEntry( APP_KEY + "ChartType", int(PIE) ) ) );
m_addValues = AddValuesType(
settings.readNumEntry( APP_KEY + "AddValues", int(NO) ));
m_decimalPlaces = settings.readNumEntry( APP_KEY + "Decimals", 2 );
m_font = QFont( "Helvetica", 18, QFont::Bold );
m_font.fromString(
settings.readEntry( APP_KEY + "Font", m_font.toString() ) );
for ( int i = 0; i < MAX_RECENTFILES; ++i ) {
QString filename = settings.readEntry( APP_KEY + "File" +
QString::number( i + 1 ) );
if ( !filename.isEmpty() )
m_recentFiles.push_back( filename );
}
if ( m_recentFiles.count() )
updateRecentFilesMenu();
// Connect *after* we've set the chart type on so we don't call
// drawElements() prematurely.
connect( chartGroup, SIGNAL( selected(QAction*) ),
this, SLOT( updateChartType(QAction*) ) );
resize( windowWidth, windowHeight );
move( windowX, windowY );
m_canvas = new QCanvas( this );
m_canvas->resize( width(), height() );
m_canvasView = new CanvasView( m_canvas, &m_elements, this );
setCentralWidget( m_canvasView );
m_canvasView->show();
if ( !filename.isEmpty() )
load( filename );
else {
init();
m_elements[0].set( 20, red, 14, "Red" );
m_elements[1].set( 70, cyan, 2, "Cyan", darkGreen );
m_elements[2].set( 35, blue, 11, "Blue" );
m_elements[3].set( 55, yellow, 1, "Yellow", darkBlue );
m_elements[4].set( 80, magenta, 1, "Magenta" );
drawElements();
}
statusBar()->message( "Ready", 2000 );
}
ChartForm::~ChartForm()
{
delete m_printer;
}
void ChartForm::init()
{
setCaption( "Chart" );
m_filename = QString::null;
m_changed = false;
m_elements[0] = Element( Element::INVALID, red );
m_elements[1] = Element( Element::INVALID, cyan );
m_elements[2] = Element( Element::INVALID, blue );
m_elements[3] = Element( Element::INVALID, yellow );
m_elements[4] = Element( Element::INVALID, green );
m_elements[5] = Element( Element::INVALID, magenta );
m_elements[6] = Element( Element::INVALID, darkYellow );
m_elements[7] = Element( Element::INVALID, darkRed );
m_elements[8] = Element( Element::INVALID, darkCyan );
m_elements[9] = Element( Element::INVALID, darkGreen );
m_elements[10] = Element( Element::INVALID, darkMagenta );
m_elements[11] = Element( Element::INVALID, darkBlue );
for ( int i = 12; i < MAX_ELEMENTS; ++i ) {
double x = (double(i) / MAX_ELEMENTS) * 360;
int y = (int(x * 256) % 105) + 151;
int z = ((i * 17) % 105) + 151;
m_elements[i] = Element( Element::INVALID, QColor( int(x), y, z, QColor::Hsv ) );
}
}
void ChartForm::fileNew()
{
if ( okToClear() ) {
init();
drawElements();
}
}
void ChartForm::fileOpen()
{
if ( !okToClear() )
return;
QString filename = QFileDialog::getOpenFileName(
QString::null, "Charts (*.cht)", this,
"file open", "Chart -- File Open" );
if ( !filename.isEmpty() )
load( filename );
else
statusBar()->message( "File Open abandoned", 2000 );
}
void ChartForm::fileSaveAs()
{
QString filename = QFileDialog::getSaveFileName(
QString::null, "Charts (*.cht)", this,
"file save as", "Chart -- File Save As" );
if ( !filename.isEmpty() ) {
int answer = 0;
if ( QFile::exists( filename ) )
answer = QMessageBox::warning(
this, "Chart -- Overwrite File",
QString( "Overwrite\n\'%1\'?" ).
arg( filename ),
"&Yes", "&No", QString::null, 1, 1 );
if ( answer == 0 ) {
m_filename = filename;
updateRecentFiles( filename );
fileSave();
return;
}
}
statusBar()->message( "Saving abandoned", 2000 );
}
void ChartForm::fileOpenRecent( int index )
{
if ( !okToClear() )
return;
load( m_recentFiles[index] );
}
void ChartForm::updateRecentFiles( const QString& filename )
{
if ( m_recentFiles.find( filename ) != m_recentFiles.end() )
return;
m_recentFiles.push_back( filename );
if ( m_recentFiles.count() > MAX_RECENTFILES )
m_recentFiles.pop_front();
updateRecentFilesMenu();
}
void ChartForm::updateRecentFilesMenu()
{
for ( int i = 0; i < MAX_RECENTFILES; ++i ) {
if ( fileMenu->findItem( i ) )
fileMenu->removeItem( i );
if ( i < int(m_recentFiles.count()) )
fileMenu->insertItem( QString( "&%1 %2" ).
arg( i + 1 ).arg( m_recentFiles[i] ),
this, SLOT( fileOpenRecent(int) ),
0, i );
}
}
void ChartForm::fileQuit()
{
if ( okToClear() ) {
saveOptions();
qApp->exit( 0 );
}
}
bool ChartForm::okToClear()
{
if ( m_changed ) {
QString msg;
if ( m_filename.isEmpty() )
msg = "Unnamed chart ";
else
msg = QString( "Chart '%1'\n" ).arg( m_filename );
msg += "has been changed.";
switch( QMessageBox::information( this, "Chart -- Unsaved Changes",
msg, "&Save", "Cancel", "&Abandon",
0, 1 ) ) {
case 0:
fileSave();
break;
case 1:
default:
return false;
break;
case 2:
break;
}
}
return true;
}
void ChartForm::saveOptions()
{
QSettings settings;
settings.insertSearchPath( QSettings::Windows, WINDOWS_REGISTRY );
settings.writeEntry( APP_KEY + "WindowWidth", width() );
settings.writeEntry( APP_KEY + "WindowHeight", height() );
settings.writeEntry( APP_KEY + "WindowX", x() );
settings.writeEntry( APP_KEY + "WindowY", y() );
settings.writeEntry( APP_KEY + "ChartType", int(m_chartType) );
settings.writeEntry( APP_KEY + "AddValues", int(m_addValues) );
settings.writeEntry( APP_KEY + "Decimals", m_decimalPlaces );
settings.writeEntry( APP_KEY + "Font", m_font.toString() );
for ( int i = 0; i < int(m_recentFiles.count()); ++i )
settings.writeEntry( APP_KEY + "File" + QString::number( i + 1 ),
m_recentFiles[i] );
}
void ChartForm::optionsSetData()
{
SetDataForm *setDataForm = new SetDataForm( &m_elements, m_decimalPlaces, this );
if ( setDataForm->exec() ) {
m_changed = true;
drawElements();
}
delete setDataForm;
}
void ChartForm::setChartType( ChartType chartType )
{
m_chartType = chartType;
switch ( m_chartType ) {
case PIE:
optionsPieChartAction->setOn( true );
break;
case VERTICAL_BAR:
optionsVerticalBarChartAction->setOn( true );
break;
case HORIZONTAL_BAR:
optionsHorizontalBarChartAction->setOn( true );
break;
}
}
void ChartForm::updateChartType( QAction *action )
{
if ( action == optionsPieChartAction ) {
m_chartType = PIE;
}
else if ( action == optionsHorizontalBarChartAction ) {
m_chartType = HORIZONTAL_BAR;
}
else if ( action == optionsVerticalBarChartAction ) {
m_chartType = VERTICAL_BAR;
}
drawElements();
}
void ChartForm::optionsSetFont()
{
bool ok;
QFont font = QFontDialog::getFont( &ok, m_font, this );
if ( ok ) {
m_font = font;
drawElements();
}
}
void ChartForm::optionsSetOptions()
{
OptionsForm *optionsForm = new OptionsForm( this );
optionsForm->chartTypeComboBox->setCurrentItem( m_chartType );
optionsForm->setFont( m_font );
switch ( m_addValues ) {
case NO:
optionsForm->noRadioButton->setChecked( true );
break;
case YES:
optionsForm->yesRadioButton->setChecked( true );
break;
case AS_PERCENTAGE:
optionsForm->asPercentageRadioButton->setChecked( true );
break;
}
optionsForm->decimalPlacesSpinBox->setValue( m_decimalPlaces );
if ( optionsForm->exec() ) {
setChartType( ChartType(
optionsForm->chartTypeComboBox->currentItem()) );
m_font = optionsForm->font();
if ( optionsForm->noRadioButton->isChecked() )
m_addValues = NO;
else if ( optionsForm->yesRadioButton->isChecked() )
m_addValues = YES;
else if ( optionsForm->asPercentageRadioButton->isChecked() )
m_addValues = AS_PERCENTAGE;
m_decimalPlaces = optionsForm->decimalPlacesSpinBox->value();
drawElements();
}
delete optionsForm;
}
void ChartForm::helpHelp()
{
statusBar()->message( "Help is not implemented yet", 2000 );
}
void ChartForm::helpAbout()
{
QMessageBox::about( this, "Chart -- About",
"<center><h1><font color=blue>Chart<font></h1></center>"
"<p>Chart your data with <i>chart</i>.</p>"
);
}
void ChartForm::helpAboutQt()
{
QMessageBox::aboutQt( this, "Chart -- About Qt" );
}
Main:
#include <qapplication.h>
#include "chartform.h"
int main( int argc, char *argv[] )
{
QApplication app( argc, argv );
QString filename;
if ( app.argc() > 1 ) {
filename = app.argv()[1];
if ( !filename.endsWith( ".cht" ) )
filename = QString::null;
}
ChartForm *cf = new ChartForm( filename );
app.setMainWidget( cf );
cf->show();
app.connect( &app, SIGNAL(lastWindowClosed()), cf, SLOT(fileQuit()) );
return app.exec();
}
See also Step-by-step Examples.
| Copyright © 2002 Trolltech | Trademarks | Qt version 3.0.5
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