Qt 4.3: xform.cpp Example File (demos/affine/xform.cpp)

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# xform.cpp Example File
demos/affine/xform.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the documentation of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
    ** License versions 2.0 or 3.0 as published by the Free Software
    ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
    ** included in the packaging of this file.  Alternatively you may (at
    ** your option) use any later version of the GNU General Public
    ** License if such license has been publicly approved by Trolltech ASA
    ** (or its successors, if any) and the KDE Free Qt Foundation. In
    ** addition, as a special exception, Trolltech gives you certain
    ** additional rights. These rights are described in the Trolltech GPL
    ** Exception version 1.2, which can be found at
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    ** GPL_EXCEPTION.txt in this package.
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    ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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    ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
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     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #include "xform.h"
     #include "hoverpoints.h"

     #include <QLayout>
     #include <QPainter>
     #include <QPainterPath>

     const int alpha = 155;

     XFormView::XFormView(QWidget *parent)
         : ArthurFrame(parent)
     {
         setAttribute(Qt::WA_MouseTracking);
         type = VectorType;
         m_rotation = 0.0;
         m_scale = 1.0;
         m_shear = 0.0;

         pixmap = QPixmap(":/res/bg1.jpg");
         pts = new HoverPoints(this, HoverPoints::CircleShape);
         pts->setConnectionType(HoverPoints::LineConnection);
         pts->setEditable(false);
         pts->setPointSize(QSize(15, 15));
         pts->setShapeBrush(QBrush(QColor(151, 0, 0, alpha)));
         pts->setShapePen(QPen(QColor(255, 100, 50, alpha)));
         pts->setConnectionPen(QPen(QColor(151, 0, 0, 50)));
         pts->setBoundingRect(QRectF(0, 0, 500, 500));
         ctrlPoints << QPointF(250, 250) << QPointF(350, 250);
         pts->setPoints(ctrlPoints);
         connect(pts, SIGNAL(pointsChanged(const QPolygonF&)),
                 this, SLOT(updateCtrlPoints(const QPolygonF &)));
         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     }

     void XFormView::mousePressEvent(QMouseEvent *)
     {
         setDescriptionEnabled(false);
     }

     void XFormView::resizeEvent(QResizeEvent *e)
     {
         pts->setBoundingRect(rect());
         ArthurFrame::resizeEvent(e);
     }

     void XFormView::paint(QPainter *p)
     {
         p->save();
         p->setRenderHint(QPainter::Antialiasing);
         p->setRenderHint(QPainter::SmoothPixmapTransform);
         switch (type) {
         case VectorType:
             drawVectorType(p);
             break;
         case PixmapType:
             drawPixmapType(p);
             break;
         case TextType:
             drawTextType(p);
             break;
         }
         p->restore();
     }

     void XFormView::updateCtrlPoints(const QPolygonF &points)
     {
         QPointF trans = points.at(0) - ctrlPoints.at(0);

         if (qAbs(points.at(0).x() - points.at(1).x()) < 10
             && qAbs(points.at(0).y() - points.at(1).y()) < 10)
             pts->setPoints(ctrlPoints);
         if (!trans.isNull()) {
             ctrlPoints[0] = points.at(0);
             ctrlPoints[1] += trans;
             pts->setPoints(ctrlPoints);
         }
         ctrlPoints = points;

         QLineF line(ctrlPoints.at(0), ctrlPoints.at(1));
         m_rotation = line.angle(QLineF(0, 0, 1, 0));
         if (line.dy() < 0)
             m_rotation = 360 - m_rotation;

         if (trans.isNull())
             emit rotationChanged(int(m_rotation*10));
     }

     void XFormView::setVectorType()
     {
         type = VectorType;
         update();
     }

     void XFormView::setPixmapType()
     {
         type = PixmapType;
         update();
     }

     void XFormView::setTextType()
     {
         type = TextType;
         update();
     }

     void XFormView::setAnimation(bool animate)
     {
         timer.stop();
         if (animate)
             timer.start(25, this);
     }

     void XFormView::changeRotation(int r)
     {
         setRotation(double(r)/10.0);
     }

     void XFormView::changeScale(int s)
     {
         setScale(double(s)/1000.0);
     }

     void XFormView::changeShear(int s)
     {
         setShear(double(s)/1000.0);
     }

     void XFormView::setShear(double s)
     {
         m_shear = s;
         update();
     }

     void XFormView::setScale(double s)
     {
         m_scale = s;
         update();
     }

     void XFormView::setRotation(double r)
     {
         double old_rot = m_rotation;
         m_rotation = r;

         QPointF center(pts->points().at(0));
         QMatrix m;
         m.translate(center.x(), center.y());
         m.rotate(m_rotation - old_rot);
         m.translate(-center.x(), -center.y());
         pts->setPoints(pts->points() * m);

         update();
     }

     void XFormView::timerEvent(QTimerEvent *e)
     {
         if (e->timerId() == timer.timerId()) {
             QPointF center(pts->points().at(0));
             QMatrix m;
             m.translate(center.x(), center.y());
             m.rotate(0.2);
             m.translate(-center.x(), -center.y());
             pts->setPoints(pts->points() * m);

             setUpdatesEnabled(false);
             static double scale_inc = 0.003;
             static double shear_inc = -0.001;
             emit scaleChanged(int((m_scale + scale_inc) * 1000));
             emit shearChanged(int((m_shear + shear_inc) * 1000));
             if (m_scale >= 4.0 || m_scale <= 0.1)
                 scale_inc = -scale_inc;
             if (m_shear >= 1.0 || m_shear <= -1.0)
                 shear_inc = -shear_inc;
             setUpdatesEnabled(true);

             pts->firePointChange();
         }
     }

     void XFormView::wheelEvent(QWheelEvent *e)
     {
         m_scale += e->delta()/600.0;
         m_scale = qMax(.1, qMin(4.0, m_scale));
         emit scaleChanged(int(m_scale*1000));
     }

     void XFormView::reset()
     {
         emit rotationChanged(0);
         emit scaleChanged(1000);
         emit shearChanged(0);
         ctrlPoints = QPolygonF();
         ctrlPoints << QPointF(250, 250) << QPointF(350, 250);
         pts->setPoints(ctrlPoints);
         pts->firePointChange();
     }

     void XFormView::drawPixmapType(QPainter *painter)
     {
         QPointF center(pixmap.width()/2.0, pixmap.height()/2.0);
         painter->translate(ctrlPoints.at(0) - center);

         painter->translate(center);
         painter->rotate(m_rotation);
         painter->scale(m_scale, m_scale);
         painter->shear(0, m_shear);
         painter->translate(-center);

         painter->drawPixmap(QPointF(0, 0), pixmap);
         painter->setPen(QPen(QColor(255, 0, 0, alpha), 0.25, Qt::SolidLine, Qt::FlatCap, Qt::BevelJoin));
         painter->setBrush(Qt::NoBrush);
         painter->drawRect(QRectF(0, 0, pixmap.width(), pixmap.height()).adjusted(-2, -2, 2, 2));
     }

     void XFormView::drawTextType(QPainter *painter)
     {
         QPainterPath path;
         QFont f("times new roman,utopia");
         f.setStyleStrategy(QFont::ForceOutline);
         f.setPointSize(72);
         f.setStyleHint(QFont::Times);
         path.addText(0, 0, f, textEditor->text());

         QFontMetrics fm(f);
         QRectF br(fm.boundingRect(textEditor->text()));
         QPointF center(br.center());
         painter->translate(ctrlPoints.at(0) - center);

         painter->translate(center);
         painter->rotate(m_rotation);
         painter->scale(m_scale, m_scale);
         painter->shear(0, m_shear);
         painter->translate(-center);

         painter->fillPath(path, Qt::black);

         painter->setPen(QPen(QColor(255, 0, 0, alpha), 0.25, Qt::SolidLine, Qt::FlatCap, Qt::BevelJoin));
         painter->setBrush(Qt::NoBrush);
         painter->drawRect(br.adjusted(-1, -1, 1, 1));
     }

     void XFormView::drawVectorType(QPainter *painter)
     {
         QPainterPath path;
         painter->translate(ctrlPoints.at(0) - QPointF(250,250));

         painter->scale(0.77, 0.77);
         painter->translate(98.9154 + 30 , -217.691 - 20);

         QRect br(-55, 275, 500, 590);
         QPoint center = br.center();
         painter->translate(center.x(), center.y());
         painter->rotate(m_rotation);
         painter->scale(m_scale, m_scale);
         painter->shear(0, m_shear);
         painter->translate(-center.x(), -center.y());

         painter->setPen(Qt::NoPen);
         path.moveTo(120, 470);
         path.lineTo(60+245, 470);
         path.lineTo(60+245, 470+350);
         path.lineTo(60, 470+350);
         path.lineTo(60, 470+80);

         painter->setBrush(Qt::white);
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor( 193, 193, 191, 255));
         path.moveTo(329.336, 727.552);
         path.cubicTo(QPointF(315.224, 726.328), QPointF(304.136, 715.816), QPointF(303.128, 694.936));
         path.cubicTo(QPointF(306.368, 639.496), QPointF(309.608, 582.112), QPointF(271.232, 545.104));
         path.cubicTo(QPointF(265.256, 499.024), QPointF(244.016, 482.104), QPointF(234.008, 452.512));
         path.lineTo(218.24, 441.208);
         path.lineTo(237.104, 411.688);
         path.lineTo(245.168, 411.904);
         path.lineTo(323.936, 571.168);
         path.lineTo(340.424, 651.448);
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(136.232, 439.696);
         path.cubicTo(QPointF(133.856, 455.248), QPointF(132.56, 470.512), QPointF(134.792, 485.272));
         path.cubicTo(QPointF(118.376, 507.592), QPointF(105.92, 530.128), QPointF(104.48, 553.312));
         path.cubicTo(QPointF(92.024, 586.504), QPointF(62.432, 614.584), QPointF(67.544, 680.104));
         path.cubicTo(QPointF(84.176, 697.456), QPointF(107.432, 713.584), QPointF(127.376, 730.36));
         path.cubicTo(QPointF(152.432, 751.312), QPointF(137.528, 778.96), QPointF(102.248, 772.408));
         path.cubicTo(QPointF(94.4, 763.768), QPointF(76.616, 709.624), QPointF(42.92, 676.288));
         path.lineTo(49.544, 632.584);
         path.lineTo(81.368, 547.408);
         path.lineTo(120.968, 484.048);
         path.lineTo(125.36, 456.688);
         path.lineTo(119.816, 386.776);
         path.lineTo(124.424, 361.216);
         path.lineTo(136.232, 439.696);
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(115.64, 341.416);
         path.cubicTo(QPointF(116.576, 336.376), QPointF(117.8, 331.624), QPointF(119.312, 327.16));
         path.lineTo(121.688, 342.784);
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(120.968, 500.464);
         path.cubicTo(QPointF(108.368, 523.792), QPointF(103.976, 546.256), QPointF(132.92, 550.216));
         path.cubicTo(QPointF(117.008, 553.888), QPointF(97.208, 568.648), QPointF(77.192, 593.488));
         path.lineTo(77.624, 543.016);
         path.lineTo(101.456, 503.272);
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(-33.256, 818.488);
         path.cubicTo(QPointF(10.52, 838.144), QPointF(41.408, 837.064), QPointF(69.272, 850.96));
         path.cubicTo(QPointF(91.304, 862.552), QPointF(113.552, 861.184), QPointF(126.944, 847.144));
         path.cubicTo(QPointF(138.32, 832.456), QPointF(146.744, 831.736), QPointF(163.52, 830.224));
         path.cubicTo(QPointF(190.952, 828.568), QPointF(217.736, 828.28), QPointF(241.928, 830.8));
         path.lineTo(269.576, 833.032);
         path.cubicTo(QPointF(269.072, 864.064), QPointF(328.04, 867.88), QPointF(345.392, 844.336));
         path.cubicTo(QPointF(366.344, 819.424), QPointF(395.144, 808.264), QPointF(419.84, 790.192));
         path.lineTo(289.304, 725.536);
         path.cubicTo(QPointF(255.824, 806.464), QPointF(131.048, 827.632), QPointF(113.768, 763.264));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(286.424, 711.568);
         path.cubicTo(QPointF(273.824, 711.496), QPointF(260.936, 715.6), QPointF(261.944, 732.16));
         path.lineTo(266.192, 776.44);
         path.lineTo(304.424, 756.64);
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(0, 0, 0, 255));
         path.moveTo(-37.36, 821.224);
         path.cubicTo(QPointF(7.136, 840.88), QPointF(38.6, 839.728), QPointF(66.968, 853.696));
         path.cubicTo(QPointF(89.36, 865.216), QPointF(111.968, 863.92), QPointF(125.648, 849.808));
         path.cubicTo(QPointF(137.24, 835.192), QPointF(145.808, 834.472), QPointF(162.872, 832.96));
         path.cubicTo(QPointF(190.736, 831.232), QPointF(218.024, 831.016), QPointF(242.648, 833.464));
         path.lineTo(270.728, 835.768);
         path.cubicTo(QPointF(270.224, 866.8), QPointF(330.272, 870.544), QPointF(347.912, 847));
         path.cubicTo(QPointF(369.224, 822.088), QPointF(398.528, 811), QPointF(423.656, 792.856));
         path.lineTo(290.816, 728.272);
         path.cubicTo(QPointF(256.76, 809.128), QPointF(129.824, 830.296), QPointF(112.256, 766));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(183, 114, 0, 255));
         path.moveTo(382.328, 691.984);
         path.cubicTo(QPointF(403.64, 698.968), QPointF(389.888, 720.28), QPointF(400.76, 732.52));
         path.cubicTo(QPointF(405.44, 742.888), QPointF(415.304, 752.032), QPointF(431.792, 760.528));
         path.cubicTo(QPointF(459.368, 774.424), QPointF(426.248, 799.336), QPointF(392.768, 812.08));
         path.cubicTo(QPointF(351.944, 825.616), QPointF(344.024, 862.912), QPointF(299.312, 851.896));
         path.cubicTo(QPointF(283.112, 846.496), QPointF(278.36, 831.808), QPointF(278.864, 809.128));
         path.cubicTo(QPointF(284.264, 762.76), QPointF(277.784, 730.432), QPointF(278.792, 698.824));
         path.cubicTo(QPointF(278.72, 686.152), QPointF(283.544, 684.64), QPointF(307.232, 687.952));
         path.cubicTo(QPointF(310.04, 726.328), QPointF(352.376, 727.336), QPointF(382.328, 691.984));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(242, 183, 0, 255));
         path.moveTo(339.632, 826.624);
         path.cubicTo(QPointF(371.6, 814.312), QPointF(403.856, 798.112), QPointF(429.848, 782.128));
         path.cubicTo(QPointF(437.84, 777.448), QPointF(438.92, 765.928), QPointF(427.688, 762.328));
         path.cubicTo(QPointF(403.352, 748.504), QPointF(390.104, 731.224), QPointF(392.912, 708.76));
         path.cubicTo(QPointF(393.344, 700.912), QPointF(383.696, 692.56), QPointF(381.104, 700.048));
         path.cubicTo(QPointF(359.864, 771.472), QPointF(291.32, 767.656), QPointF(300.752, 696.952));
         path.cubicTo(QPointF(301.256, 694.864), QPointF(301.76, 692.776), QPointF(302.264, 690.76));
         path.cubicTo(QPointF(289.952, 688.24), QPointF(285.2, 690.976), QPointF(285.776, 700.408));
         path.lineTo(295.28, 806.608);
         path.cubicTo(QPointF(297.656, 830.8), QPointF(317.312, 836.128), QPointF(339.632, 826.624));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(0, 0, 0, 255));
         path.moveTo(354.464, 537.544);
         path.cubicTo(QPointF(379.16, 569.8), QPointF(404.432, 651.088), QPointF(384.416, 691.552));
         path.cubicTo(QPointF(360.944, 737.776), QPointF(307.808, 743.248), QPointF(305.504, 695.8));
         path.cubicTo(QPointF(308.816, 639.64), QPointF(311.984, 581.536), QPointF(273.68, 544.096));
         path.cubicTo(QPointF(267.704, 497.368), QPointF(246.392, 480.232), QPointF(236.384, 450.28));
         path.lineTo(203.12, 426.088);
         path.lineTo(133.568, 435.088);
         path.cubicTo(QPointF(130.76, 452.152), QPointF(129.104, 468.784), QPointF(131.552, 484.912));
         path.cubicTo(QPointF(115.064, 507.376), QPointF(102.608, 530.056), QPointF(101.168, 553.312));
         path.cubicTo(QPointF(88.712, 586.648), QPointF(59.12, 614.944), QPointF(64.232, 680.752));
         path.cubicTo(QPointF(80.864, 698.248), QPointF(104.12, 714.448), QPointF(124.064, 731.296));
         path.cubicTo(QPointF(149.12, 752.392), QPointF(135.512, 776.296), QPointF(100.232, 769.672));
         path.cubicTo(QPointF(78.848, 746.056), QPointF(56.744, 722.872), QPointF(35.288, 699.328));
         path.cubicTo(QPointF(12.392, 683.056), QPointF(3.896, 662.176), QPointF(27.368, 630.496));
         path.cubicTo(QPointF(43.424, 609.04), QPointF(47.96, 562.456), QPointF(62, 543.664));
         path.cubicTo(QPointF(74.312, 525.16), QPointF(92.24, 508.6), QPointF(105.272, 490.096));
         path.cubicTo(QPointF(112.184, 477.928), QPointF(114.344, 468.568), QPointF(113.264, 454.456));
         path.lineTo(110.312, 369.136);
         path.cubicTo(QPointF(108.368, 307.216), QPointF(142.424, 274.24), QPointF(189.8, 275.248));
         path.cubicTo(QPointF(243.512, 275.752), QPointF(287.576, 312.472), QPointF(288.152, 378.28));
         path.cubicTo(QPointF(292.688, 410.32), QPointF(283.256, 428.68), QPointF(308.672, 474.472));
         path.cubicTo(QPointF(334.52, 522.712), QPointF(338.552, 520.12), QPointF(354.464, 537.544));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(261.296, 503.632);
         path.lineTo(263.528, 512.2);
         path.cubicTo(QPointF(257.696, 501.688), QPointF(250.712, 483.616), QPointF(241.928, 475.696));
         path.cubicTo(QPointF(239.264, 473.536), QPointF(235.808, 473.608), QPointF(233.72, 475.624));
         path.cubicTo(QPointF(222.056, 486.928), QPointF(193.112, 510.112), QPointF(169.928, 507.088));
         path.cubicTo(QPointF(152.072, 505.288), QPointF(134.648, 493.264), QPointF(130.832, 480.232));
         path.cubicTo(QPointF(128.816, 470.872), QPointF(129.752, 463.168), QPointF(130.976, 455.32));
         path.lineTo(240.704, 453.52);
         path.cubicTo(QPointF(238.472, 463.168), QPointF(253.088, 487), QPointF(261.296, 503.632));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(143.144, 363.232);
         path.cubicTo(QPointF(154.088, 363.232), QPointF(163.88, 376.84), QPointF(163.808, 395.632));
         path.cubicTo(QPointF(163.736, 408.232), QPointF(155.528, 411.472), QPointF(149.336, 417.016));
         path.cubicTo(QPointF(146.6, 419.536), QPointF(145.952, 433.144), QPointF(142.568, 433.144));
         path.cubicTo(QPointF(131.696, 433.144), QPointF(123.488, 413.776), QPointF(123.488, 395.632));
         path.cubicTo(QPointF(123.488, 377.56), QPointF(132.272, 363.232), QPointF(143.144, 363.232));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(255, 255, 255, 255));
         path.moveTo(144.368, 375.04);
         path.cubicTo(QPointF(154.088, 375.04), QPointF(160.856, 379.936), QPointF(161.648, 391.312));
         path.cubicTo(QPointF(162.224, 399.16), QPointF(160.136, 411.76), QPointF(154.664, 414.424));
         path.cubicTo(QPointF(152.144, 415.648), QPointF(143.432, 426.664), QPointF(140.408, 426.52));
         path.cubicTo(QPointF(128.096, 425.944), QPointF(125, 402.112), QPointF(125.936, 390.736));
         path.cubicTo(QPointF(126.8, 379.36), QPointF(134.72, 375.04), QPointF(144.368, 375.04));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(0, 0, 0, 255));
         path.moveTo(141.848, 382.672);
         path.cubicTo(QPointF(148.544, 382.096), QPointF(154.736, 389.728), QPointF(155.6, 399.664));
         path.cubicTo(QPointF(156.464, 409.6), QPointF(151.64, 418.24), QPointF(144.944, 418.816));
         path.cubicTo(QPointF(138.248, 419.392), QPointF(132.056, 411.76), QPointF(131.192, 401.752));
         path.cubicTo(QPointF(130.328, 391.816), QPointF(135.152, 383.248), QPointF(141.848, 382.672));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(151.064, 397.288);
         path.cubicTo(QPointF(151.424, 399.088), QPointF(149.408, 400.024), QPointF(148.832, 398.224));
         path.cubicTo(QPointF(148.256, 395.992), QPointF(146.888, 393.328), QPointF(145.088, 391.168));
         path.cubicTo(QPointF(143.936, 389.872), QPointF(145.088, 388.432), QPointF(146.528, 389.44));
         path.cubicTo(QPointF(149.048, 391.528), QPointF(150.488, 394.12), QPointF(151.064, 397.288));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(216.944, 360.712);
         path.cubicTo(QPointF(232.712, 360.712), QPointF(245.6, 377.416), QPointF(245.6, 397.792));
         path.cubicTo(QPointF(245.6, 418.24), QPointF(232.712, 434.872), QPointF(216.944, 434.872));
         path.cubicTo(QPointF(201.176, 434.872), QPointF(188.432, 418.24), QPointF(188.432, 397.792));
         path.cubicTo(QPointF(188.432, 377.416), QPointF(201.176, 360.712), QPointF(216.944, 360.712));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(255, 255, 255, 255));
         path.moveTo(224.792, 374.968);
         path.cubicTo(QPointF(235.664, 378.856), QPointF(241.928, 387.424), QPointF(242.72, 396.568));
         path.cubicTo(QPointF(243.656, 407.08), QPointF(239.408, 418.96), QPointF(230.264, 425.944));
         path.cubicTo(QPointF(227.672, 427.888), QPointF(197.72, 416.08), QPointF(195.992, 411.616));
         path.cubicTo(QPointF(193.4, 405.208), QPointF(191.816, 392.896), QPointF(193.76, 385.624));
         path.cubicTo(QPointF(194.552, 382.744), QPointF(197.216, 378.568), QPointF(201.176, 376.336));
         path.cubicTo(QPointF(207.44, 372.808), QPointF(216.656, 372.088), QPointF(224.792, 374.968));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(0, 0, 0, 255));
         path.moveTo(216.872, 380.944);
         path.cubicTo(QPointF(225.584, 380.944), QPointF(232.712, 389.296), QPointF(232.712, 399.448));
         path.cubicTo(QPointF(232.712, 409.672), QPointF(225.584, 418.024), QPointF(216.872, 418.024));
         path.cubicTo(QPointF(208.16, 418.024), QPointF(201.032, 409.672), QPointF(201.032, 399.448));
         path.cubicTo(QPointF(201.032, 389.296), QPointF(208.16, 380.944), QPointF(216.872, 380.944));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(227.096, 392.392);
         path.cubicTo(QPointF(228.104, 394.048), QPointF(226.448, 395.776), QPointF(225.224, 394.12));
         path.cubicTo(QPointF(223.784, 392.104), QPointF(221.408, 389.944), QPointF(218.888, 388.432));
         path.cubicTo(QPointF(217.232, 387.568), QPointF(217.808, 385.624), QPointF(219.68, 386.2));
         path.cubicTo(QPointF(222.92, 387.28), QPointF(225.368, 389.368), QPointF(227.096, 392.392));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(183, 114, 0, 255));
         path.moveTo(164.96, 404.488);
         path.cubicTo(QPointF(172.376, 402.328), QPointF(184.112, 403.048), QPointF(192.248, 404.632));
         path.cubicTo(QPointF(200.384, 406.792), QPointF(222.056, 418.24), QPointF(245.024, 430.696));
         path.cubicTo(QPointF(247.976, 432.208), QPointF(248.84, 437.104), QPointF(245.024, 438.688));
         path.cubicTo(QPointF(239.12, 439.12), QPointF(249.272, 453.664), QPointF(238.904, 458.848));
         path.cubicTo(QPointF(223.352, 462.88), QPointF(198.44, 485.992), QPointF(186.128, 487.864));
         path.cubicTo(QPointF(179.288, 489.376), QPointF(172.232, 489.592), QPointF(164.6, 487.864));
         path.cubicTo(QPointF(140.552, 482.968), QPointF(134.216, 455.608), QPointF(122.912, 450.064));
         path.cubicTo(QPointF(119.816, 446.824), QPointF(121.4, 441.208), QPointF(122.408, 440.056));
         path.cubicTo(QPointF(123.632, 434.224), QPointF(149.696, 406.216), QPointF(164.96, 404.488));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(242, 183, 0, 255));
         path.moveTo(185.408, 405.856);
         path.cubicTo(QPointF(198.44, 407.296), QPointF(226.088, 423.928), QPointF(239.408, 430.624));
         path.cubicTo(QPointF(242.72, 432.424), QPointF(242.504, 437.824), QPointF(239.552, 438.688));
         path.cubicTo(QPointF(236.384, 440.488), QPointF(235.448, 438.256), QPointF(232.928, 437.896));
         path.cubicTo(QPointF(228.896, 435.736), QPointF(222.272, 440.92), QPointF(217.016, 444.88));
         path.cubicTo(QPointF(186.704, 467.776), QPointF(180.656, 465.256), QPointF(156.176, 462.664));
         path.cubicTo(QPointF(147.68, 460.576), QPointF(142.136, 457.984), QPointF(139.688, 455.968));
         path.cubicTo(QPointF(141.488, 445.888), QPointF(160.496, 407.656), QPointF(166.76, 406.792));
         path.cubicTo(QPointF(168.344, 404.704), QPointF(179.936, 404.632), QPointF(185.408, 405.856));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(183, 114, 0, 255));
         path.moveTo(190.664, 412.048);
         path.lineTo(193.76, 413.416);
         path.cubicTo(QPointF(196.064, 414.712), QPointF(193.256, 418.168), QPointF(190.736, 417.088));
         path.lineTo(186.2, 415.504);
         path.cubicTo(QPointF(183.536, 413.272), QPointF(186.704, 410.104), QPointF(190.664, 412.048));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(268.568, 452.368);
         path.cubicTo(QPointF(273.032, 454.384), QPointF(279.224, 457.192), QPointF(282.536, 460.144));
         path.cubicTo(QPointF(285.488, 464.104), QPointF(286.784, 468.064), QPointF(286.424, 472.024));
         path.cubicTo(QPointF(285.776, 474.544), QPointF(284.12, 476.344), QPointF(281.24, 477.424));
         path.cubicTo(QPointF(277.856, 478.216), QPointF(273.68, 477.424), QPointF(271.376, 474.112));
         path.cubicTo(QPointF(269.864, 471.448), QPointF(265.256, 462.16), QPointF(263.96, 460.576));
         path.cubicTo(QPointF(262.232, 457.12), QPointF(261.944, 454.456), QPointF(262.88, 452.368));
         path.cubicTo(QPointF(264.032, 451.288), QPointF(266.048, 451), QPointF(268.568, 452.368));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(255, 255, 255, 255));
         path.moveTo(273.752, 461.584);
         path.cubicTo(QPointF(275.48, 462.376), QPointF(277.928, 463.456), QPointF(279.224, 464.68));
         path.cubicTo(QPointF(280.376, 466.264), QPointF(280.88, 467.776), QPointF(280.736, 469.36));
         path.cubicTo(QPointF(280.52, 470.296), QPointF(279.8, 471.016), QPointF(278.72, 471.448));
         path.cubicTo(QPointF(277.352, 471.808), QPointF(275.768, 471.448), QPointF(274.832, 470.152));
         path.cubicTo(QPointF(274.256, 469.144), QPointF(272.456, 465.472), QPointF(271.952, 464.824));
         path.cubicTo(QPointF(271.232, 463.456), QPointF(271.088, 462.448), QPointF(271.448, 461.584));
         path.cubicTo(QPointF(271.952, 461.152), QPointF(272.744, 461.08), QPointF(273.752, 461.584));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(238.616, 358.552);
         path.cubicTo(QPointF(239.048, 359.2), QPointF(238.976, 359.776), QPointF(238.4, 360.28));
         path.cubicTo(QPointF(237.896, 360.784), QPointF(237.176, 360.712), QPointF(236.24, 360.208));
         path.lineTo(231.632, 356.248);
         path.cubicTo(QPointF(231.056, 355.744), QPointF(230.912, 354.952), QPointF(231.272, 354.088));
         path.cubicTo(QPointF(232.28, 353.44), QPointF(233.144, 353.44), QPointF(233.936, 354.088));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(235.592, 305.992);
         path.cubicTo(QPointF(239.624, 308.224), QPointF(240.848, 313.912), QPointF(238.184, 318.592));
         path.cubicTo(QPointF(235.592, 323.2), QPointF(230.12, 325.144), QPointF(226.016, 322.84));
         path.cubicTo(QPointF(221.984, 320.536), QPointF(220.76, 314.92), QPointF(223.424, 310.24));
         path.cubicTo(QPointF(226.016, 305.56), QPointF(231.488, 303.688), QPointF(235.592, 305.992));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(374.912, 680.536);
         path.cubicTo(QPointF(378.296, 683.128), QPointF(373.256, 687.376), QPointF(371.024, 686.296));
         path.cubicTo(QPointF(369.152, 685.648), QPointF(367.784, 683.488), QPointF(366.92, 682.408));
         path.cubicTo(QPointF(366.128, 681.184), QPointF(366.2, 679.168), QPointF(366.92, 678.448));
         path.cubicTo(QPointF(367.712, 677.44), QPointF(369.728, 677.656), QPointF(371.024, 678.52));
         path.cubicTo(QPointF(372.32, 679.168), QPointF(373.616, 679.888), QPointF(374.912, 680.536));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(297.44, 551.512);
         path.cubicTo(QPointF(338.984, 572.896), QPointF(350, 611.56), QPointF(332.072, 664.192));
         path.cubicTo(QPointF(330.992, 666.64), QPointF(334.16, 668.368), QPointF(335.24, 666.064));
         path.cubicTo(QPointF(354.824, 610.336), QPointF(341.432, 571.312), QPointF(299.024, 548.56));
         path.cubicTo(QPointF(296.864, 547.552), QPointF(295.28, 550.432), QPointF(297.44, 551.512));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(72.008, 569.512);
         path.cubicTo(QPointF(38.312, 627.256), QPointF(38.096, 662.68), QPointF(62.504, 681.328));
         path.cubicTo(QPointF(63.728, 682.264), QPointF(64.448, 680.032), QPointF(63.296, 679.168));
         path.cubicTo(QPointF(36.296, 655.48), QPointF(48.896, 615.52), QPointF(74.168, 570.88));
         path.cubicTo(QPointF(74.888, 569.584), QPointF(72.512, 568.432), QPointF(72.008, 569.512));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(289.376, 586.864);
         path.cubicTo(QPointF(289.232, 589.168), QPointF(288.368, 589.528), QPointF(286.424, 587.368));
         path.cubicTo(QPointF(279.8, 575.848), QPointF(235.088, 551.44), QPointF(213.344, 548.704));
         path.cubicTo(QPointF(209.24, 547.264), QPointF(209.456, 545.392), QPointF(213.488, 544.816));
         path.cubicTo(QPointF(229.184, 544.816), QPointF(241.28, 537.904), QPointF(254.96, 537.904));
         path.cubicTo(QPointF(258.704, 538.048), QPointF(262.304, 539.488), QPointF(264.392, 541.648));
         path.cubicTo(QPointF(269.504, 544.96), QPointF(288.08, 570.592), QPointF(289.376, 586.864));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(180.152, 546.832);
         path.cubicTo(QPointF(180.872, 550.792), QPointF(163.808, 545.68), QPointF(164.744, 556.696));
         path.cubicTo(QPointF(165.032, 559.72), QPointF(160.496, 561.376), QPointF(160.64, 556.696));
         path.cubicTo(QPointF(160.64, 548.272), QPointF(161.072, 548.416), QPointF(152.72, 546.832));
         path.cubicTo(QPointF(151.208, 546.76), QPointF(151.352, 544.528), QPointF(152.72, 544.816));
         path.lineTo(152.72, 544.816);
         path.cubicTo(QPointF(158.696, 546.472), QPointF(166.76, 542.872), QPointF(166.4, 538.84));
         path.cubicTo(QPointF(166.256, 537.472), QPointF(168.56, 537.688), QPointF(168.488, 538.84));
         path.cubicTo(QPointF(167.984, 545.248), QPointF(181.664, 542.152), QPointF(180.152, 546.832));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(193, 193, 191, 255));
         path.moveTo(151.568, 705.376);
         path.cubicTo(QPointF(151.64, 708.328), QPointF(148.76, 707.68), QPointF(148.544, 705.592));
         path.cubicTo(QPointF(140.192, 680.536), QPointF(143.72, 618.832), QPointF(151.856, 598.96));
         path.cubicTo(QPointF(152.432, 596.08), QPointF(156.248, 596.944), QPointF(155.744, 598.96));
         path.cubicTo(QPointF(147.104, 635.464), QPointF(147.248, 673.048), QPointF(151.568, 705.376));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(183, 114, 0, 255));
         path.moveTo(51.704, 684.424);
         path.cubicTo(QPointF(75.68, 707.824), QPointF(91.376, 743.248), QPointF(114.632, 775.288));
         path.cubicTo(QPointF(148.472, 816.04), QPointF(121.472, 858.304), QPointF(66.464, 845.56));
         path.cubicTo(QPointF(38.888, 835.192), QPointF(-0.784, 836.344), QPointF(-32.68, 825.832));
         path.cubicTo(QPointF(-55.072, 820.36), QPointF(-55.864, 809.272), QPointF(-44.416, 787.6));
         path.cubicTo(QPointF(-40.384, 773.776), QPointF(-40.024, 751.312), QPointF(-43.768, 732.592));
         path.cubicTo(QPointF(-45.784, 718.408), QPointF(-39.232, 710.488), QPointF(-24.112, 708.832));
         path.lineTo(-24.112, 708.832);
         path.cubicTo(QPointF(-11.296, 708.688), QPointF(6.56, 713.872), QPointF(16.28, 686.44));
         path.cubicTo(QPointF(23.552, 673.336), QPointF(40.976, 672.976), QPointF(51.704, 684.424));
         path.closeSubpath();
         painter->drawPath(path);
         path = QPainterPath();

         painter->setBrush(QColor(242, 183, 0, 255));
         path.moveTo(24.632, 699.04);
         path.cubicTo(QPointF(23.84, 680.968), QPointF(39.32, 677.296), QPointF(49.688, 688.312));
         path.cubicTo(QPointF(68.192, 710.992), QPointF(85.112, 736.048), QPointF(100.376, 764.992));
         path.cubicTo(QPointF(124.712, 804.16), QPointF(104.624, 842.68), QPointF(67.904, 828.064));
         path.cubicTo(QPointF(49.688, 817.84), QPointF(6.128, 813.304), QPointF(-17.344, 809.128));
         path.cubicTo(QPointF(-33.04, 807.832), QPointF(-35.128, 797.608), QPointF(-29.152, 791.848));
         path.cubicTo(QPointF(-20.944, 782.416), QPointF(-20.08, 759.808), QPointF(-27.856, 740.512));
         path.cubicTo(QPointF(-35.56, 728.56), QPointF(-21.088, 715.384), QPointF(-9.712, 720.856));
         path.cubicTo(QPointF(0.8, 727.048), QPointF(25.64, 713.08), QPointF(24.632, 699.04));
         path.closeSubpath();
         painter->drawPath(path);

         painter->setPen(QPen(QColor(255, 0, 0, alpha), 0.25, Qt::SolidLine, Qt::FlatCap, Qt::BevelJoin));
         painter->setBrush(Qt::NoBrush);
         painter->drawRect(br.adjusted(-1, -1, 1, 1));
     }

     XFormWidget::XFormWidget(QWidget *parent)
         : QWidget(parent)
     {
         setWindowTitle("Affine Transformations");

         view = new XFormView(this);
         view->setMinimumSize(200, 200);

         QGroupBox *mainGroup = new QGroupBox(this);
         mainGroup->setFixedWidth(180);
         mainGroup->setTitle("Affine Transformations");

         QGroupBox *rotateGroup = new QGroupBox(mainGroup);
         rotateGroup->setAttribute(Qt::WA_ContentsPropagated);
         rotateGroup->setTitle("Rotate");
         QSlider *rotateSlider = new QSlider(Qt::Horizontal, rotateGroup);
         rotateSlider->setRange(0, 3600);
         rotateSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

         QGroupBox *scaleGroup = new QGroupBox(mainGroup);
         scaleGroup->setAttribute(Qt::WA_ContentsPropagated);
         scaleGroup->setTitle("Scale");
         QSlider *scaleSlider = new QSlider(Qt::Horizontal, scaleGroup);
         scaleSlider->setRange(1, 4000);
         scaleSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

         QGroupBox *shearGroup = new QGroupBox(mainGroup);
         shearGroup->setAttribute(Qt::WA_ContentsPropagated);
         shearGroup->setTitle("Shear");
         QSlider *shearSlider = new QSlider(Qt::Horizontal, shearGroup);
         shearSlider->setRange(-990, 990);
         shearSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

         QGroupBox *typeGroup = new QGroupBox(mainGroup);
         typeGroup->setAttribute(Qt::WA_ContentsPropagated);
         typeGroup->setTitle("Type");
         QRadioButton *vectorType = new QRadioButton(typeGroup);
         QRadioButton *pixmapType = new QRadioButton(typeGroup);
         QRadioButton *textType= new QRadioButton(typeGroup);
         vectorType->setText("Vector Image");
         pixmapType->setText("Pixmap");
         textType->setText("Text");
         view->textEditor = new QLineEdit(typeGroup);

         QPushButton *resetButton = new QPushButton(mainGroup);
         resetButton->setText("Reset Transform");

         QPushButton *animateButton = new QPushButton(mainGroup);
         animateButton->setText("Animate");
         animateButton->setCheckable(true);

         QPushButton *showSourceButton = new QPushButton(mainGroup);
         showSourceButton->setText("Show Source");
     #ifdef QT_OPENGL_SUPPORT
         QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
         enableOpenGLButton->setText("Use OpenGL");
         enableOpenGLButton->setCheckable(true);
         enableOpenGLButton->setChecked(view->usesOpenGL());
         if (!QGLFormat::hasOpenGL())
             enableOpenGLButton->hide();
     #endif
         QPushButton *whatsThisButton = new QPushButton(mainGroup);
         whatsThisButton->setText("What's This?");
         whatsThisButton->setCheckable(true);

         QHBoxLayout *viewLayout = new QHBoxLayout(this);
         viewLayout->addWidget(view);
         viewLayout->addWidget(mainGroup);

         QVBoxLayout *rotateGroupLayout = new QVBoxLayout(rotateGroup);
         rotateGroupLayout->addWidget(rotateSlider);

         QVBoxLayout *scaleGroupLayout = new QVBoxLayout(scaleGroup);
         scaleGroupLayout->addWidget(scaleSlider);

         QVBoxLayout *shearGroupLayout = new QVBoxLayout(shearGroup);
         shearGroupLayout->addWidget(shearSlider);

         QVBoxLayout *typeGroupLayout = new QVBoxLayout(typeGroup);
         typeGroupLayout->addWidget(vectorType);
         typeGroupLayout->addWidget(pixmapType);
         typeGroupLayout->addWidget(textType);
         typeGroupLayout->addSpacing(4);
         typeGroupLayout->addWidget(view->textEditor);

         QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
         mainGroupLayout->addWidget(rotateGroup);
         mainGroupLayout->addWidget(scaleGroup);
         mainGroupLayout->addWidget(shearGroup);
         mainGroupLayout->addWidget(typeGroup);
         mainGroupLayout->addStretch(1);
         mainGroupLayout->addWidget(resetButton);
         mainGroupLayout->addWidget(animateButton);
         mainGroupLayout->addWidget(showSourceButton);
     #ifdef QT_OPENGL_SUPPORT
         mainGroupLayout->addWidget(enableOpenGLButton);
     #endif
         mainGroupLayout->addWidget(whatsThisButton);

         connect(rotateSlider, SIGNAL(valueChanged(int)), view, SLOT(changeRotation(int)));
         connect(shearSlider, SIGNAL(valueChanged(int)), view, SLOT(changeShear(int)));
         connect(scaleSlider, SIGNAL(valueChanged(int)), view, SLOT(changeScale(int)));

         connect(vectorType, SIGNAL(clicked()), view, SLOT(setVectorType()));
         connect(pixmapType, SIGNAL(clicked()), view, SLOT(setPixmapType()));
         connect(textType, SIGNAL(clicked()), view, SLOT(setTextType()));
         connect(textType, SIGNAL(toggled(bool)), view->textEditor, SLOT(setEnabled(bool)));
         connect(view->textEditor, SIGNAL(textChanged(const QString &)), view, SLOT(update()));

         connect(view, SIGNAL(rotationChanged(int)), rotateSlider, SLOT(setValue(int)));
         connect(view, SIGNAL(scaleChanged(int)), scaleSlider, SLOT(setValue(int)));
         connect(view, SIGNAL(shearChanged(int)), shearSlider, SLOT(setValue(int)));

         connect(resetButton, SIGNAL(clicked()), view, SLOT(reset()));
         connect(animateButton, SIGNAL(clicked(bool)), view, SLOT(setAnimation(bool)));
         connect(whatsThisButton, SIGNAL(clicked(bool)), view, SLOT(setDescriptionEnabled(bool)));
         connect(whatsThisButton, SIGNAL(clicked(bool)), view->hoverPoints(), SLOT(setDisabled(bool)));
         connect(view, SIGNAL(descriptionEnabledChanged(bool)), view->hoverPoints(), SLOT(setDisabled(bool)));
         connect(view, SIGNAL(descriptionEnabledChanged(bool)), whatsThisButton, SLOT(setChecked(bool)));
         connect(showSourceButton, SIGNAL(clicked()), view, SLOT(showSource()));
     #ifdef QT_OPENGL_SUPPORT
         connect(enableOpenGLButton, SIGNAL(clicked(bool)), view, SLOT(enableOpenGL(bool)));
     #endif
         view->loadSourceFile(":res/xform.cpp");
         view->loadDescription(":res/xform.html");

         // defaults
         view->reset();
         vectorType->setChecked(true);
         view->textEditor->setText("Trolltech");
         view->textEditor->setEnabled(false);

         animateButton->animateClick();
     }