pathstroke.cpp Example File | Qt Widgets 5.6

Qt 5.6 | Qt Widgets | Path Stroking | pathstroke.cpp Example File

Qt 5.6.2 Reference Documentation

# pathstroke.cpp Example File

painting/pathstroke/pathstroke.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the demonstration applications of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
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      ** information use the contact form at http://www.qt.io/contact-us.
      **
      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 2.1 or version 3 as published by the Free
      ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
      ** following information to ensure the GNU Lesser General Public License
      ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
      ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
      **
      ** As a special exception, The Qt Company gives you certain additional
      ** rights. These rights are described in The Qt Company LGPL Exception
      ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #include "arthurstyle.h"
      #include "arthurwidgets.h"
      #include "pathstroke.h"

      #include <stdio.h>

      extern void draw_round_rect(QPainter *p, const QRect &bounds, int radius);

      PathStrokeControls::PathStrokeControls(QWidget* parent, PathStrokeRenderer* renderer, bool smallScreen)
            : QWidget(parent)
      {
          m_renderer = renderer;

          if (smallScreen)
              layoutForSmallScreens();
          else
              layoutForDesktop();
      }

      void PathStrokeControls::createCommonControls(QWidget* parent)
      {
          m_capGroup = new QGroupBox(parent);
          m_capGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
          QRadioButton *flatCap = new QRadioButton(m_capGroup);
          QRadioButton *squareCap = new QRadioButton(m_capGroup);
          QRadioButton *roundCap = new QRadioButton(m_capGroup);
          m_capGroup->setTitle(tr("Cap Style"));
          flatCap->setText(tr("Flat"));
          squareCap->setText(tr("Square"));
          roundCap->setText(tr("Round"));
          flatCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
          squareCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
          roundCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

          m_joinGroup = new QGroupBox(parent);
          m_joinGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
          QRadioButton *bevelJoin = new QRadioButton(m_joinGroup);
          QRadioButton *miterJoin = new QRadioButton(m_joinGroup);
          QRadioButton *roundJoin = new QRadioButton(m_joinGroup);
          m_joinGroup->setTitle(tr("Join Style"));
          bevelJoin->setText(tr("Bevel"));
          miterJoin->setText(tr("Miter"));
          roundJoin->setText(tr("Round"));

          m_styleGroup = new QGroupBox(parent);
          m_styleGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
          QRadioButton *solidLine = new QRadioButton(m_styleGroup);
          QRadioButton *dashLine = new QRadioButton(m_styleGroup);
          QRadioButton *dotLine = new QRadioButton(m_styleGroup);
          QRadioButton *dashDotLine = new QRadioButton(m_styleGroup);
          QRadioButton *dashDotDotLine = new QRadioButton(m_styleGroup);
          QRadioButton *customDashLine = new QRadioButton(m_styleGroup);
          m_styleGroup->setTitle(tr("Pen Style"));

          QPixmap line_solid(":res/images/line_solid.png");
          solidLine->setIcon(line_solid);
          solidLine->setIconSize(line_solid.size());
          QPixmap line_dashed(":res/images/line_dashed.png");
          dashLine->setIcon(line_dashed);
          dashLine->setIconSize(line_dashed.size());
          QPixmap line_dotted(":res/images/line_dotted.png");
          dotLine->setIcon(line_dotted);
          dotLine->setIconSize(line_dotted.size());
          QPixmap line_dash_dot(":res/images/line_dash_dot.png");
          dashDotLine->setIcon(line_dash_dot);
          dashDotLine->setIconSize(line_dash_dot.size());
          QPixmap line_dash_dot_dot(":res/images/line_dash_dot_dot.png");
          dashDotDotLine->setIcon(line_dash_dot_dot);
          dashDotDotLine->setIconSize(line_dash_dot_dot.size());
          customDashLine->setText(tr("Custom"));

          int fixedHeight = bevelJoin->sizeHint().height();
          solidLine->setFixedHeight(fixedHeight);
          dashLine->setFixedHeight(fixedHeight);
          dotLine->setFixedHeight(fixedHeight);
          dashDotLine->setFixedHeight(fixedHeight);
          dashDotDotLine->setFixedHeight(fixedHeight);

          m_pathModeGroup = new QGroupBox(parent);
          m_pathModeGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
          QRadioButton *curveMode = new QRadioButton(m_pathModeGroup);
          QRadioButton *lineMode = new QRadioButton(m_pathModeGroup);
          m_pathModeGroup->setTitle(tr("Line Style"));
          curveMode->setText(tr("Curves"));
          lineMode->setText(tr("Lines"));

          // Layouts
          QVBoxLayout *capGroupLayout = new QVBoxLayout(m_capGroup);
          capGroupLayout->addWidget(flatCap);
          capGroupLayout->addWidget(squareCap);
          capGroupLayout->addWidget(roundCap);

          QVBoxLayout *joinGroupLayout = new QVBoxLayout(m_joinGroup);
          joinGroupLayout->addWidget(bevelJoin);
          joinGroupLayout->addWidget(miterJoin);
          joinGroupLayout->addWidget(roundJoin);

          QVBoxLayout *styleGroupLayout = new QVBoxLayout(m_styleGroup);
          styleGroupLayout->addWidget(solidLine);
          styleGroupLayout->addWidget(dashLine);
          styleGroupLayout->addWidget(dotLine);
          styleGroupLayout->addWidget(dashDotLine);
          styleGroupLayout->addWidget(dashDotDotLine);
          styleGroupLayout->addWidget(customDashLine);

          QVBoxLayout *pathModeGroupLayout = new QVBoxLayout(m_pathModeGroup);
          pathModeGroupLayout->addWidget(curveMode);
          pathModeGroupLayout->addWidget(lineMode);

          // Connections
          connect(flatCap, SIGNAL(clicked()), m_renderer, SLOT(setFlatCap()));
          connect(squareCap, SIGNAL(clicked()), m_renderer, SLOT(setSquareCap()));
          connect(roundCap, SIGNAL(clicked()), m_renderer, SLOT(setRoundCap()));

          connect(bevelJoin, SIGNAL(clicked()), m_renderer, SLOT(setBevelJoin()));
          connect(miterJoin, SIGNAL(clicked()), m_renderer, SLOT(setMiterJoin()));
          connect(roundJoin, SIGNAL(clicked()), m_renderer, SLOT(setRoundJoin()));

          connect(curveMode, SIGNAL(clicked()), m_renderer, SLOT(setCurveMode()));
          connect(lineMode, SIGNAL(clicked()), m_renderer, SLOT(setLineMode()));

          connect(solidLine, SIGNAL(clicked()), m_renderer, SLOT(setSolidLine()));
          connect(dashLine, SIGNAL(clicked()), m_renderer, SLOT(setDashLine()));
          connect(dotLine, SIGNAL(clicked()), m_renderer, SLOT(setDotLine()));
          connect(dashDotLine, SIGNAL(clicked()), m_renderer, SLOT(setDashDotLine()));
          connect(dashDotDotLine, SIGNAL(clicked()), m_renderer, SLOT(setDashDotDotLine()));
          connect(customDashLine, SIGNAL(clicked()), m_renderer, SLOT(setCustomDashLine()));

          // Set the defaults:
          flatCap->setChecked(true);
          bevelJoin->setChecked(true);
          curveMode->setChecked(true);
          solidLine->setChecked(true);
      }

      void PathStrokeControls::layoutForDesktop()
      {
          QGroupBox *mainGroup = new QGroupBox(this);
          mainGroup->setFixedWidth(180);
          mainGroup->setTitle(tr("Path Stroking"));

          createCommonControls(mainGroup);

          QGroupBox* penWidthGroup = new QGroupBox(mainGroup);
          QSlider *penWidth = new QSlider(Qt::Horizontal, penWidthGroup);
          penWidth->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
          penWidthGroup->setTitle(tr("Pen Width"));
          penWidth->setRange(0, 500);

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

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

          // Layouts:
          QVBoxLayout *penWidthLayout = new QVBoxLayout(penWidthGroup);
          penWidthLayout->addWidget(penWidth);

          QVBoxLayout * mainLayout = new QVBoxLayout(this);
          mainLayout->setMargin(0);
          mainLayout->addWidget(mainGroup);

          QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
          mainGroupLayout->setMargin(3);
          mainGroupLayout->addWidget(m_capGroup);
          mainGroupLayout->addWidget(m_joinGroup);
          mainGroupLayout->addWidget(m_styleGroup);
          mainGroupLayout->addWidget(penWidthGroup);
          mainGroupLayout->addWidget(m_pathModeGroup);
          mainGroupLayout->addWidget(animated);
          mainGroupLayout->addStretch(1);
          mainGroupLayout->addWidget(showSourceButton);
      #ifdef QT_OPENGL_SUPPORT
          mainGroupLayout->addWidget(enableOpenGLButton);
      #endif
          mainGroupLayout->addWidget(whatsThisButton);

          // Set up connections
          connect(animated, SIGNAL(toggled(bool)), m_renderer, SLOT(setAnimation(bool)));

          connect(penWidth, SIGNAL(valueChanged(int)), m_renderer, SLOT(setPenWidth(int)));

          connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
      #ifdef QT_OPENGL_SUPPORT
          connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
      #endif
          connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
          connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
                  whatsThisButton, SLOT(setChecked(bool)));

          // Set the defaults
          animated->setChecked(true);
          penWidth->setValue(50);

      }

      void PathStrokeControls::layoutForSmallScreens()
      {
          createCommonControls(this);

          m_capGroup->layout()->setMargin(0);
          m_joinGroup->layout()->setMargin(0);
          m_styleGroup->layout()->setMargin(0);
          m_pathModeGroup->layout()->setMargin(0);

          QPushButton* okBtn = new QPushButton(tr("OK"), this);
          okBtn->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
          okBtn->setMinimumSize(100,okBtn->minimumSize().height());

          QPushButton* quitBtn = new QPushButton(tr("Quit"), this);
          quitBtn->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
          quitBtn->setMinimumSize(100, okBtn->minimumSize().height());

          QLabel *penWidthLabel = new QLabel(tr(" Width:"));
          QSlider *penWidth = new QSlider(Qt::Horizontal, this);
          penWidth->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
          penWidth->setRange(0, 500);

      #ifdef QT_OPENGL_SUPPORT
          QPushButton *enableOpenGLButton = new QPushButton(this);
          enableOpenGLButton->setText(tr("Use OpenGL"));
          enableOpenGLButton->setCheckable(true);
          enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
          if (!QGLFormat::hasOpenGL())
              enableOpenGLButton->hide();
      #endif

          // Layouts:
          QHBoxLayout *penWidthLayout = new QHBoxLayout(0);
          penWidthLayout->addWidget(penWidthLabel, 0, Qt::AlignRight);
          penWidthLayout->addWidget(penWidth);

          QVBoxLayout *leftLayout = new QVBoxLayout(0);
          leftLayout->addWidget(m_capGroup);
          leftLayout->addWidget(m_joinGroup);
      #ifdef QT_OPENGL_SUPPORT
          leftLayout->addWidget(enableOpenGLButton);
      #endif
          leftLayout->addLayout(penWidthLayout);

          QVBoxLayout *rightLayout = new QVBoxLayout(0);
          rightLayout->addWidget(m_styleGroup);
          rightLayout->addWidget(m_pathModeGroup);

          QGridLayout *mainLayout = new QGridLayout(this);
          mainLayout->setMargin(0);

          // Add spacers around the form items so we don't look stupid at higher resolutions
          mainLayout->addItem(new QSpacerItem(0,0), 0, 0, 1, 4);
          mainLayout->addItem(new QSpacerItem(0,0), 1, 0, 2, 1);
          mainLayout->addItem(new QSpacerItem(0,0), 1, 3, 2, 1);
          mainLayout->addItem(new QSpacerItem(0,0), 3, 0, 1, 4);

          mainLayout->addLayout(leftLayout, 1, 1);
          mainLayout->addLayout(rightLayout, 1, 2);
          mainLayout->addWidget(quitBtn, 2, 1, Qt::AlignHCenter | Qt::AlignTop);
          mainLayout->addWidget(okBtn, 2, 2, Qt::AlignHCenter | Qt::AlignTop);

      #ifdef QT_OPENGL_SUPPORT
          connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
      #endif

          connect(penWidth, SIGNAL(valueChanged(int)), m_renderer, SLOT(setPenWidth(int)));
          connect(quitBtn, SIGNAL(clicked()), this, SLOT(emitQuitSignal()));
          connect(okBtn, SIGNAL(clicked()), this, SLOT(emitOkSignal()));

          m_renderer->setAnimation(true);
          penWidth->setValue(50);
      }

      void PathStrokeControls::emitQuitSignal()
      {
          emit quitPressed();
      }

      void PathStrokeControls::emitOkSignal()
      {
          emit okPressed();
      }

      PathStrokeWidget::PathStrokeWidget(bool smallScreen)
      {
          setWindowTitle(tr("Path Stroking"));

          // Widget construction and property setting
          m_renderer = new PathStrokeRenderer(this, smallScreen);

          m_controls = new PathStrokeControls(0, m_renderer, smallScreen);

          // Layouting
          QHBoxLayout *viewLayout = new QHBoxLayout(this);
          viewLayout->addWidget(m_renderer);

          if (!smallScreen)
              viewLayout->addWidget(m_controls);

          m_renderer->loadSourceFile(":res/pathstroke/pathstroke.cpp");
          m_renderer->loadDescription(":res/pathstroke/pathstroke.html");

          connect(m_renderer, SIGNAL(clicked()), this, SLOT(showControls()));
          connect(m_controls, SIGNAL(okPressed()), this, SLOT(hideControls()));
          connect(m_controls, SIGNAL(quitPressed()), QApplication::instance(), SLOT(quit()));
      }

      void PathStrokeWidget::showControls()
      {
          m_controls->showFullScreen();
      }

      void PathStrokeWidget::hideControls()
      {
          m_controls->hide();
      }

      void PathStrokeWidget::setStyle( QStyle * style )
      {
          QWidget::setStyle(style);
          if (m_controls != 0)
          {
              m_controls->setStyle(style);

              QList<QWidget *> widgets = m_controls->findChildren<QWidget *>();
              foreach (QWidget *w, widgets)
                  w->setStyle(style);
          }
      }

      PathStrokeRenderer::PathStrokeRenderer(QWidget *parent, bool smallScreen)
          : ArthurFrame(parent)
      {
          m_smallScreen = smallScreen;
          m_pointSize = 10;
          m_activePoint = -1;
          m_capStyle = Qt::FlatCap;
          m_joinStyle = Qt::BevelJoin;
          m_pathMode = CurveMode;
          m_penWidth = 1;
          m_penStyle = Qt::SolidLine;
          m_wasAnimated = true;
          setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
          setAttribute(Qt::WA_AcceptTouchEvents);
      }

      void PathStrokeRenderer::paint(QPainter *painter)
      {
          if (m_points.isEmpty())
              initializePoints();

          painter->setRenderHint(QPainter::Antialiasing);

          QPalette pal = palette();
          painter->setPen(Qt::NoPen);

          // Construct the path
          QPainterPath path;
          path.moveTo(m_points.at(0));

          if (m_pathMode == LineMode) {
              for (int i=1; i<m_points.size(); ++i)
                  path.lineTo(m_points.at(i));
          } else {
              int i=1;
              while (i + 2 < m_points.size()) {
                  path.cubicTo(m_points.at(i), m_points.at(i+1), m_points.at(i+2));
                  i += 3;
              }
              while (i < m_points.size()) {
                  path.lineTo(m_points.at(i));
                  ++i;
              }
          }

          // Draw the path
          {
              QColor lg = Qt::red;

              // The "custom" pen
              if (m_penStyle == Qt::NoPen) {
                  QPainterPathStroker stroker;
                  stroker.setWidth(m_penWidth);
                  stroker.setJoinStyle(m_joinStyle);
                  stroker.setCapStyle(m_capStyle);

                  QVector<qreal> dashes;
                  qreal space = 4;
                  dashes << 1 << space
                         << 3 << space
                         << 9 << space
                         << 27 << space
                         << 9 << space
                         << 3 << space;
                  stroker.setDashPattern(dashes);
                  QPainterPath stroke = stroker.createStroke(path);
                  painter->fillPath(stroke, lg);

              } else {
                  QPen pen(lg, m_penWidth, m_penStyle, m_capStyle, m_joinStyle);
                  painter->strokePath(path, pen);
              }
          }

          if (1) {
              // Draw the control points
              painter->setPen(QColor(50, 100, 120, 200));
              painter->setBrush(QColor(200, 200, 210, 120));
              for (int i=0; i<m_points.size(); ++i) {
                  QPointF pos = m_points.at(i);
                  painter->drawEllipse(QRectF(pos.x() - m_pointSize,
                                             pos.y() - m_pointSize,
                                             m_pointSize*2, m_pointSize*2));
              }
              painter->setPen(QPen(Qt::lightGray, 0, Qt::SolidLine));
              painter->setBrush(Qt::NoBrush);
              painter->drawPolyline(m_points);
          }

      }

      void PathStrokeRenderer::initializePoints()
      {
          const int count = 7;
          m_points.clear();
          m_vectors.clear();

          QMatrix m;
          qreal rot = 360.0 / count;
          QPointF center(width() / 2, height() / 2);
          QMatrix vm;
          vm.shear(2, -1);
          vm.scale(3, 3);

          for (int i=0; i<count; ++i) {
              m_vectors << QPointF(.1f, .25f) * (m * vm);
              m_points << QPointF(0, 100) * m + center;
              m.rotate(rot);
          }
      }

      void PathStrokeRenderer::updatePoints()
      {
          qreal pad = 10;
          qreal left = pad;
          qreal right = width() - pad;
          qreal top = pad;
          qreal bottom = height() - pad;

          Q_ASSERT(m_points.size() == m_vectors.size());
          for (int i=0; i<m_points.size(); ++i) {
              QPointF pos = m_points.at(i);
              QPointF vec = m_vectors.at(i);
              pos += vec;
              if (pos.x() < left || pos.x() > right) {
                  vec.setX(-vec.x());
                  pos.setX(pos.x() < left ? left : right);
              } if (pos.y() < top || pos.y() > bottom) {
                  vec.setY(-vec.y());
                  pos.setY(pos.y() < top ? top : bottom);
              }
              m_points[i] = pos;
              m_vectors[i] = vec;
          }
          update();
      }

      void PathStrokeRenderer::mousePressEvent(QMouseEvent *e)
      {
          if (!m_fingerPointMapping.isEmpty())
              return;
          setDescriptionEnabled(false);
          m_activePoint = -1;
          qreal distance = -1;
          for (int i=0; i<m_points.size(); ++i) {
              qreal d = QLineF(e->pos(), m_points.at(i)).length();
              if ((distance < 0 && d < 8 * m_pointSize) || d < distance) {
                  distance = d;
                  m_activePoint = i;
              }
          }

          if (m_activePoint != -1) {
              m_wasAnimated = m_timer.isActive();
              setAnimation(false);
              mouseMoveEvent(e);
          }

          // If we're not running in small screen mode, always assume we're dragging
          m_mouseDrag = !m_smallScreen;
          m_mousePress = e->pos();
      }

      void PathStrokeRenderer::mouseMoveEvent(QMouseEvent *e)
      {
          if (!m_fingerPointMapping.isEmpty())
              return;
          // If we've moved more then 25 pixels, assume user is dragging
          if (!m_mouseDrag && QPoint(m_mousePress - e->pos()).manhattanLength() > 25)
              m_mouseDrag = true;

          if (m_mouseDrag && m_activePoint >= 0 && m_activePoint < m_points.size()) {
              m_points[m_activePoint] = e->pos();
              update();
          }
      }

      void PathStrokeRenderer::mouseReleaseEvent(QMouseEvent *)
      {
          if (!m_fingerPointMapping.isEmpty())
              return;
          m_activePoint = -1;
          setAnimation(m_wasAnimated);

          if (!m_mouseDrag && m_smallScreen)
              emit clicked();
      }

      void PathStrokeRenderer::timerEvent(QTimerEvent *e)
      {
          if (e->timerId() == m_timer.timerId()) {
              updatePoints();
          } // else if (e->timerId() == m_fpsTimer.timerId()) {
      //         emit frameRate(m_frameCount);
      //         m_frameCount = 0;
      //     }
      }

      bool PathStrokeRenderer::event(QEvent *e)
      {
          bool touchBegin = false;
          switch (e->type()) {
          case QEvent::TouchBegin:
              touchBegin = true;
          case QEvent::TouchUpdate:
          {
              const QTouchEvent *const event = static_cast<const QTouchEvent*>(e);
              const QList<QTouchEvent::TouchPoint> points = event->touchPoints();
              foreach (const QTouchEvent::TouchPoint &touchPoint, points) {
                  const int id = touchPoint.id();
                  switch (touchPoint.state()) {
                  case Qt::TouchPointPressed:
                  {
                      // find the point, move it
                      QSet<int> activePoints = QSet<int>::fromList(m_fingerPointMapping.values());
                      int activePoint = -1;
                      qreal distance = -1;
                      const int pointsCount = m_points.size();
                      for (int i=0; i<pointsCount; ++i) {
                          if (activePoints.contains(i))
                              continue;

                          qreal d = QLineF(touchPoint.pos(), m_points.at(i)).length();
                          if ((distance < 0 && d < 12 * m_pointSize) || d < distance) {
                              distance = d;
                              activePoint = i;
                          }
                      }
                      if (activePoint != -1) {
                          m_fingerPointMapping.insert(touchPoint.id(), activePoint);
                          m_points[activePoint] = touchPoint.pos();
                      }
                      break;
                  }
                  case Qt::TouchPointReleased:
                  {
                      // move the point and release
                      QHash<int,int>::iterator it = m_fingerPointMapping.find(id);
                      m_points[it.value()] = touchPoint.pos();
                      m_fingerPointMapping.erase(it);
                      break;
                  }
                  case Qt::TouchPointMoved:
                  {
                      // move the point
                      const int pointIdx = m_fingerPointMapping.value(id, -1);
                      if (pointIdx >= 0)
                          m_points[pointIdx] = touchPoint.pos();
                      break;
                  }
                  default:
                      break;
                  }
              }
              if (m_fingerPointMapping.isEmpty()) {
                  e->ignore();
                  return false;
              } else {
                  if (touchBegin) {
                      m_wasAnimated = m_timer.isActive();
                      setAnimation(false);
                  }
                  update();
                  return true;
              }
          }
              break;
          case QEvent::TouchEnd:
              if (m_fingerPointMapping.isEmpty()) {
                  e->ignore();
                  return false;
              }
              m_fingerPointMapping.clear();
              setAnimation(m_wasAnimated);
              return true;
              break;
          default:
              break;
          }
          return QWidget::event(e);
      }

      void PathStrokeRenderer::setAnimation(bool animation)
      {
          m_timer.stop();
      //     m_fpsTimer.stop();

          if (animation) {
              m_timer.start(25, this);
      //         m_fpsTimer.start(1000, this);
      //         m_frameCount = 0;
          }
      }