File: t12-main-cpp.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex"><title>Qt tutorial - t12/main.cpp</title>
</head><body bgcolor="#ffffff">
<p>
<a href=index.html><img width=122 height=65 src=qtlogo.jpg alt="Qt logo" align=left border=0></a>
<center><img src=dochead.gif width=472 height=27></center>
<br clear=all>
<p>
<h1 align=center>Source code for <a href="t12.html">tutorial 12</a>: main.cpp</h1><br clear="all">
<hr>
<pre>/****************************************************************
**
** Qt tutorial 12
**
****************************************************************/

#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
#include &lt;<a href="qscrollbar-h.html">qscrollbar.h</a>&gt;
#include &lt;<a href="qlcdnumber-h.html">qlcdnumber.h</a>&gt;
#include &lt;<a href="qfont-h.html">qfont.h</a>&gt;

#include "lcdrange.h"
#include "cannon.h"

class MyWidget : public QWidget
{
public:
    MyWidget( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
protected:
    void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
private:
    <a href="qpushbutton.html">QPushButton</a> *quit;
    <a href="qpushbutton.html">QPushButton</a> *shoot;
    LCDRange    *angle;
    LCDRange    *force;
    CannonField *cannonField;
};

MyWidget::MyWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name )
{
    <a href="qwidget.html#c6">setMinimumSize</a>( 500, 355 );

    quit = new <a href="qpushbutton.html">QPushButton</a>( "Quit", this, "quit" );
    quit-&gt;<a href="qpushbutton.html#b4">setGeometry</a>( 10, 10, 75, 30 );
    quit-&gt;<a href="qwidget.html#f9">setFont</a>( <a href="qfont.html">QFont</a>( "Times", 18, QFont::Bold ) );

    <a href="qobject.html#f2">connect</a>( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );

    angle  = new LCDRange( "ANGLE", this, "angle" );
    angle-&gt;setRange( 5, 70 );
    angle-&gt;<a href="qwidget.html#l5">setGeometry</a>( 10, quit-&gt;<a href="qwidget.html#b6">y</a>() + quit-&gt;<a href="qwidget.html#c0">height</a>() + 10, 75, 130 );

    force  = new LCDRange( "FORCE", this, "force" );
    force-&gt;setRange( 10, 50 );
    force-&gt;<a href="qwidget.html#l5">setGeometry</a>( 10, angle-&gt;<a href="qwidget.html#b6">y</a>() + angle-&gt;<a href="qwidget.html#c0">height</a>() + 10, 75, 130 );

    cannonField = new CannonField( this, "cannonField" );
    cannonField-&gt;move( angle-&gt;<a href="qwidget.html#b5">x</a>() + angle-&gt;<a href="qwidget.html#b9">width</a>() + 10, angle-&gt;<a href="qwidget.html#b6">y</a>() );
    cannonField-&gt;setBackgroundColor( <a href="qcolor.html">QColor</a>( 250, 250, 200) );

    <a href="qobject.html#f2">connect</a>( angle,SIGNAL(valueChanged(int)), cannonField,SLOT(setAngle(int)));
    <a href="qobject.html#f2">connect</a>( cannonField,SIGNAL(angleChanged(int)), angle,SLOT(setValue(int)));

    <a href="qobject.html#f2">connect</a>( force,SIGNAL(valueChanged(int)), cannonField,SLOT(setForce(int)));
    <a href="qobject.html#f2">connect</a>( cannonField,SIGNAL(forceChanged(int)), force,SLOT(setValue(int)));

    <a href="qobject.html#f2">connect</a>( cannonField, SIGNAL(hit()), cannonField, SLOT(newTarget()) );

    angle-&gt;setValue( 60 );
    force-&gt;setValue( 25 );

    shoot = new <a href="qpushbutton.html">QPushButton</a>( "Shoot", this, "shoot" );
    shoot-&gt;<a href="qpushbutton.html#b4">setGeometry</a>( 90, 10, 75, 30 );
    shoot-&gt;<a href="qwidget.html#f9">setFont</a>( <a href="qfont.html">QFont</a>( "Times", 18, QFont::Bold ) );

    <a href="qobject.html#f2">connect</a>( shoot, SIGNAL(clicked()), cannonField, SLOT(shoot()) );
}

void <a name="252"></a>MyWidget::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
    cannonField-&gt;resize( <a href="qwidget.html#b9">width</a>()  - cannonField-&gt;x() - 10,
                         <a href="qwidget.html#c0">height</a>() - cannonField-&gt;y() - 10 );
}

int main( int argc, char **argv )
{
    <a href="qapplication.html#f6">QApplication::setColorSpec</a>( QApplication::CustomColor );
    <a href="qapplication.html">QApplication</a> a( argc, argv );

    MyWidget w;
    w.<a href="qwidget.html#l5">setGeometry</a>( 100, 100, 500, 355 );
    a.<a href="qapplication.html#b9">setMainWidget</a>( &amp;w );
    w.<a href="qwidget.html#k2">show</a>();
    return a.<a href="qapplication.html#c9">exec</a>();
}
</pre>
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