canvas-example.html

QT 下载资料仅供参考

}

void <a name="f613"></a>Main::moveU()
{
    <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
    m.<a href="qwmatrix.html#translate">translate</a>( 0, -16 );
    editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
}

void <a name="f614"></a>Main::moveD()
{
    <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
    m.<a href="qwmatrix.html#translate">translate</a>( 0, +16 );
    editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
}

void <a name="f615"></a>Main::print()
{
    if ( !printer ) printer = new <a href="qprinter.html">QPrinter</a>;
    if ( printer-&gt;setup(this) ) {
        <a href="qpainter.html">QPainter</a> pp(printer);
<a name="x2684"></a>        canvas.<a href="qcanvas.html#drawArea">drawArea</a>(QRect(0,0,canvas.<a href="qcanvas.html#width">width</a>(),canvas.<a href="qcanvas.html#height">height</a>()),&amp;pp,FALSE);
    }
}


void <a name="f616"></a>Main::addSprite()
{
    <a href="qcanvasitem.html">QCanvasItem</a>* i = new BouncyLogo(&amp;canvas);
<a name="x2694"></a>    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
<a name="x2695"></a>    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

QString butterfly_fn;
QString logo_fn;


void <a name="f617"></a>Main::addButterfly()
{
    if ( butterfly_fn.isEmpty() )
        return;
    if ( !butterflyimg ) {
        butterflyimg = new <a href="qimage.html">QImage</a>[4];
        butterflyimg[0].load( butterfly_fn );
        butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
                int(butterflyimg[0].height()*0.75) );
        butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
                int(butterflyimg[0].height()*0.5) );
        butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
                int(butterflyimg[0].height()*0.25) );
    }
    <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(butterflyimg[rand()%4],&amp;canvas);
<a name="x2691"></a>    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-butterflyimg-&gt;<a href="qimage.html#width">width</a>()),
            rand()%(canvas.<a href="qcanvas.html#height">height</a>()-butterflyimg-&gt;<a href="qimage.html#height">height</a>()));
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+250);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f618"></a>Main::addLogo()
{
    if ( logo_fn.isEmpty() )
        return;
    if ( !logoimg ) {
        logoimg = new <a href="qimage.html">QImage</a>[4];
        logoimg[0].load( logo_fn );
        logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
                int(logoimg[0].height()*0.75) );
        logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
                int(logoimg[0].height()*0.5) );
        logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
                int(logoimg[0].height()*0.25) );
    }
    <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(logoimg[rand()%4],&amp;canvas);
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-logoimg-&gt;<a href="qimage.html#width">width</a>()),
            rand()%(canvas.<a href="qcanvas.html#height">height</a>()-logoimg-&gt;<a href="qimage.html#width">width</a>()));
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}



void <a name="f619"></a>Main::addCircle()
{
    <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new <a href="qcanvasellipse.html">QCanvasEllipse</a>(50,50,&amp;canvas);
<a name="x2699"></a>    i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f620"></a>Main::addHexagon()
{
    <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&amp;canvas);
    const int size = canvas.<a href="qcanvas.html#width">width</a>() / 25;
    <a href="qpointarray.html">QPointArray</a> pa(6);
    pa[0] = QPoint(2*size,0);
    pa[1] = QPoint(size,-size*173/100);
    pa[2] = QPoint(-size,-size*173/100);
    pa[3] = QPoint(-2*size,0);
    pa[4] = QPoint(-size,size*173/100);
    pa[5] = QPoint(size,size*173/100);
<a name="x2698"></a>    i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>(pa);
    i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f621"></a>Main::addPolygon()
{
    <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&amp;canvas);
    const int size = canvas.<a href="qcanvas.html#width">width</a>()/2;
    <a href="qpointarray.html">QPointArray</a> pa(6);
    pa[0] = QPoint(0,0);
    pa[1] = QPoint(size,size/5);
    pa[2] = QPoint(size*4/5,size);
    pa[3] = QPoint(size/6,size*5/4);
    pa[4] = QPoint(size*3/4,size*3/4);
    pa[5] = QPoint(size*3/4,size/4);
    i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>(pa);
    i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f622"></a>Main::addSpline()
{
    <a href="qcanvasspline.html">QCanvasSpline</a>* i = new <a href="qcanvasspline.html">QCanvasSpline</a>(&amp;canvas);
    const int size = canvas.<a href="qcanvas.html#width">width</a>()/6;
    <a href="qpointarray.html">QPointArray</a> pa(12);
    pa[0] = QPoint(0,0);
    pa[1] = QPoint(size/2,0);
    pa[2] = QPoint(size,size/2);
    pa[3] = QPoint(size,size);
    pa[4] = QPoint(size,size*3/2);
    pa[5] = QPoint(size/2,size*2);
    pa[6] = QPoint(0,size*2);
    pa[7] = QPoint(-size/2,size*2);
    pa[8] = QPoint(size/4,size*3/2);
    pa[9] = QPoint(0,size);
    pa[10]= QPoint(-size/4,size/2);
    pa[11]= QPoint(-size/2,0);
<a name="x2702"></a>    i-&gt;<a href="qcanvasspline.html#setControlPoints">setControlPoints</a>(pa);
    i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f623"></a>Main::addText()
{
    <a href="qcanvastext.html">QCanvasText</a>* i = new <a href="qcanvastext.html">QCanvasText</a>(&amp;canvas);
<a name="x2705"></a>    i-&gt;<a href="qcanvastext.html#setText">setText</a>("QCanvasText");
    i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f624"></a>Main::addLine()
{
    <a href="qcanvasline.html">QCanvasLine</a>* i = new <a href="qcanvasline.html">QCanvasLine</a>(&amp;canvas);
    i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>(),
                  rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>() );
<a name="x2700"></a>    i-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}

void <a name="f625"></a>Main::addMesh()
{
    int x0 = 0;
    int y0 = 0;

    if ( !tb ) tb = new <a href="qbrush.html">QBrush</a>( Qt::red );
    if ( !tp ) tp = new <a href="qpen.html">QPen</a>( Qt::black );

    int nodecount = 0;

    int w = canvas.<a href="qcanvas.html#width">width</a>();
    int h = canvas.<a href="qcanvas.html#height">height</a>();

    const int dist = 30;
    int rows = h / dist;
    int cols = w / dist;

#ifndef QT_NO_PROGRESSDIALOG
    <a href="qprogressdialog.html">QProgressDialog</a> progress( "Creating mesh...", "Abort", rows,
                              this, "progress", TRUE );
#endif

    <a href="qmemarray.html">QMemArray</a>&lt;NodeItem*&gt; lastRow(cols);
    for ( int j = 0; j &lt; rows; j++ ) {
        int n = j%2 ? cols-1 : cols;
        NodeItem *prev = 0;
        for ( int i = 0; i &lt; n; i++ ) {
            NodeItem *el = new NodeItem( &amp;canvas );
            nodecount++;
            int r = rand();
            int xrand = r %20;
            int yrand = (r/20) %20;
            el-&gt;<a href="qcanvasitem.html#move">move</a>( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ),
                      yrand + y0 + j*dist );

            if ( j &gt; 0 ) {
                if ( i &lt; cols-1 )
                    (new EdgeItem( lastRow[i], el, &amp;canvas ))-&gt;show();
                if ( j%2 )
                    (new EdgeItem( lastRow[i+1], el, &amp;canvas ))-&gt;show();
                else if ( i &gt; 0 )
                    (new EdgeItem( lastRow[i-1], el, &amp;canvas ))-&gt;show();
            }
            if ( prev ) {
                (new EdgeItem( prev, el, &amp;canvas ))-&gt;show();
            }
            if ( i &gt; 0 ) lastRow[i-1] = prev;
            prev = el;
            el-&gt;<a href="qcanvasitem.html#show">show</a>();
        }
        lastRow[n-1]=prev;
#ifndef QT_NO_PROGRESSDIALOG
<a name="x2722"></a>        progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( j );
<a name="x2723"></a>        if ( progress.<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() )
            break;
#endif
    }
#ifndef QT_NO_PROGRESSDIALOG
    progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( rows );
#endif
    // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
}

void <a name="f626"></a>Main::addRectangle()
{
    <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a> *i = new <a href="qcanvasrectangle.html">QCanvasRectangle</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>(),
                            canvas.<a href="qcanvas.html#width">width</a>()/5,canvas.<a href="qcanvas.html#width">width</a>()/5,&amp;canvas);
    int z = rand()%256;
    i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(z,z,z) );
    i-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
    i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(z);
    i-&gt;<a href="qcanvasitem.html#show">show</a>();
}
</pre>

<p> <hr>
<p> Main:
<p> <pre>#include &lt;<a href="qstatusbar-h.html">qstatusbar.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;
#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;

#include "canvas.h"

#include &lt;stdlib.h&gt;

extern QString butterfly_fn;
extern QString logo_fn;

int main(int argc, char** argv)
{
    <a href="qapplication.html">QApplication</a> app(argc,argv);

    /*
    <a href="qapplication.html#qDebug">qDebug</a>("sizeof(QCanvasPolygonalItem)=%d",sizeof(QCanvasPolygonalItem));
    <a href="qapplication.html#qDebug">qDebug</a>("sizeof(QCanvasText)=%d",sizeof(QCanvasText));
    <a href="qapplication.html#qDebug">qDebug</a>("sizeof(QWidget)=%d",sizeof(QWidget));
    <a href="qapplication.html#qDebug">qDebug</a>("sizeof(QLabel)=%d",sizeof(QLabel));
    */



    if ( argc &gt; 1 )
        butterfly_fn = argv[1];
    else
        butterfly_fn = "butterfly.png";


    if ( argc &gt; 2 )
        logo_fn = argv[2];
    else
        logo_fn = "qtlogo.png";


    <a href="qcanvas.html">QCanvas</a> canvas(800,600);
<a name="x2739"></a>    canvas.<a href="qcanvas.html#setAdvancePeriod">setAdvancePeriod</a>(30);
    Main m(canvas);
<a name="x2746"></a>    m.<a href="qwidget.html#resize">resize</a>(m.<a href="qwidget.html#sizeHint">sizeHint</a>());

<a name="x2738"></a>    qApp-&gt;<a href="qapplication.html#setMainWidget">setMainWidget</a>(&amp;m);

    m.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Canvas");
<a name="x2747"></a><a name="x2734"></a>    if ( QApplication::<a href="qapplication.html#desktop">desktop</a>()-&gt;width() &gt; m.<a href="qwidget.html#width">width</a>() + 10
<a name="x2741"></a>         &amp;&amp; QApplication::<a href="qapplication.html#desktop">desktop</a>()-&gt;height() &gt; m.<a href="qwidget.html#height">height</a>() +30 )
<a name="x2744"></a>        m.<a href="qwidget.html#show">show</a>();
    else
<a name="x2745"></a>        m.<a href="qwidget.html#showMaximized">showMaximized</a>();

    m.<a href="qwidget.html#show">show</a>();
    //    m.help();
    qApp-&gt;<a href="qapplication.html#setMainWidget">setMainWidget</a>(0);

    QObject::<a href="qobject.html#connect">connect</a>( qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );

    return app.<a href="qapplication.html#exec">exec</a>();
}

</pre>

<p>See also <a href="examples.html">Examples</a>.

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