Qt 5.11 | Qt Widgets | Stickman Example | stickman.cpp Example File

Qt 5.11.3 Reference Documentation

# stickman.cpp Example File

animation/stickman/stickman.cpp

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      #include "stickman.h"
      #include "node.h"

      #include <QPainter>
      #include <QTimer>
      #include <qmath.h>

      static const qreal Coords[NodeCount * 2] = {
          0.0, -150.0, // head, #0

          0.0, -100.0, // body pentagon, top->bottom, left->right, #1 - 5
          -50.0, -50.0,
          50.0, -50.0,
          -25.0, 50.0,
          25.0, 50.0,

          -100.0, 0.0, // right arm, #6 - 7
          -125.0, 50.0,

          100.0, 0.0, // left arm, #8 - 9
          125.0, 50.0,

          -35.0, 75.0, // lower body, #10 - 11
          35.0, 75.0,

          -25.0, 200.0, // right leg, #12 - 13
          -30.0, 300.0,

          25.0, 200.0, // left leg, #14 - 15
          30.0, 300.0

      };

      static const int Bones[BoneCount * 2] = {
          0, 1, // neck

          1, 2, // body
          1, 3,
          1, 4,
          1, 5,
          2, 3,
          2, 4,
          2, 5,
          3, 4,
          3, 5,
          4, 5,

          2, 6, // right arm
          6, 7,

          3, 8, // left arm
          8, 9,

          4, 10, // lower body
          4, 11,
          5, 10,
          5, 11,
          10, 11,

          10, 12, // right leg
          12, 13,

          11, 14, // left leg
          14, 15

      };

      StickMan::StickMan()
      {
          m_sticks = true;
          m_isDead = false;
          m_pixmap = QPixmap("images/head.png");
          m_penColor = Qt::white;
          m_fillColor = Qt::black;

          // Set up start position of limbs
          for (int i=0; i<NodeCount; ++i) {
              m_nodes[i] = new Node(QPointF(Coords[i * 2], Coords[i * 2 + 1]), this);
              connect(m_nodes[i], SIGNAL(positionChanged()), this, SLOT(childPositionChanged()));
          }

          for (int i=0; i<BoneCount; ++i) {
              int n1 = Bones[i * 2];
              int n2 = Bones[i * 2 + 1];

              Node *node1 = m_nodes[n1];
              Node *node2 = m_nodes[n2];

              QPointF dist = node1->pos() - node2->pos();
              m_perfectBoneLengths[i] = sqrt(pow(dist.x(),2) + pow(dist.y(),2));
          }

          startTimer(10);
      }

      StickMan::~StickMan()
      {
      }

      void StickMan::childPositionChanged()
      {
          prepareGeometryChange();
      }

      void StickMan::setDrawSticks(bool on)
      {
          m_sticks = on;
          for (int i=0;i<nodeCount();++i) {
              Node *node = m_nodes[i];
              node->setVisible(on);
          }
      }

      QRectF StickMan::boundingRect() const
      {
          // account for head radius=50.0 plus pen which is 5.0
          return childrenBoundingRect().adjusted(-55.0, -55.0, 55.0, 55.0);
      }

      int StickMan::nodeCount() const
      {
          return NodeCount;
      }

      Node *StickMan::node(int idx) const
      {
          if (idx >= 0 && idx < NodeCount)
              return m_nodes[idx];
          else
              return 0;
      }

      void StickMan::timerEvent(QTimerEvent *)
      {
          update();
      }

      void StickMan::stabilize()
      {
          static const qreal threshold = 0.001;

          for (int i=0; i<BoneCount; ++i) {
              int n1 = Bones[i * 2];
              int n2 = Bones[i * 2 + 1];

              Node *node1 = m_nodes[n1];
              Node *node2 = m_nodes[n2];

              QPointF pos1 = node1->pos();
              QPointF pos2 = node2->pos();

              QPointF dist = pos1 - pos2;
              qreal length = sqrt(pow(dist.x(),2) + pow(dist.y(),2));
              qreal diff = (length - m_perfectBoneLengths[i]) / length;

              QPointF p = dist * (0.5 * diff);
              if (p.x() > threshold && p.y() > threshold) {
                  pos1 -= p;
                  pos2 += p;

                  node1->setPos(pos1);
                  node2->setPos(pos2);
              }
          }
      }

      QPointF StickMan::posFor(int idx) const
      {
          return m_nodes[idx]->pos();
      }

      //#include <QTime>
      void StickMan::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
      {
        /*  static int frames = 0;
          static QTime time;
          if (frames++ % 100 == 0) {
              frames = 1;
              time.restart();
          }

          if (time.elapsed() > 0) {
              painter->setPen(Qt::white);
              painter->drawText(0, 0, QString::number(frames / (time.elapsed() / 1000.0)));
          }*/

          stabilize();
          if (m_sticks) {
              painter->setPen(Qt::white);
              for (int i=0; i<BoneCount; ++i) {
                  int n1 = Bones[i * 2];
                  int n2 = Bones[i * 2 + 1];

                  Node *node1 = m_nodes[n1];
                  Node *node2 = m_nodes[n2];

                  painter->drawLine(node1->pos(), node2->pos());
              }
          } else {
              // first bone is neck and will be used for head

              QPainterPath path;
              path.moveTo(posFor(0));
              path.lineTo(posFor(1));

              // right arm
              path.lineTo(posFor(2));
              path.lineTo(posFor(6));
              path.lineTo(posFor(7));

              // left arm
              path.moveTo(posFor(3));
              path.lineTo(posFor(8));
              path.lineTo(posFor(9));

              // body
              path.moveTo(posFor(2));
              path.lineTo(posFor(4));
              path.lineTo(posFor(10));
              path.lineTo(posFor(11));
              path.lineTo(posFor(5));
              path.lineTo(posFor(3));
              path.lineTo(posFor(1));

              // right leg
              path.moveTo(posFor(10));
              path.lineTo(posFor(12));
              path.lineTo(posFor(13));

              // left leg
              path.moveTo(posFor(11));
              path.lineTo(posFor(14));
              path.lineTo(posFor(15));

              painter->setPen(QPen(m_penColor, 5.0, Qt::SolidLine, Qt::RoundCap));
              painter->drawPath(path);

              {
                  int n1 = Bones[0];
                  int n2 = Bones[1];
                  Node *node1 = m_nodes[n1];
                  Node *node2 = m_nodes[n2];

                  QPointF dist = node2->pos() - node1->pos();

                  qreal sinAngle = dist.x() / sqrt(pow(dist.x(), 2) + pow(dist.y(), 2));
                  qreal angle = qRadiansToDegrees(asin(sinAngle));

                  QPointF headPos = node1->pos();
                  painter->translate(headPos);
                  painter->rotate(-angle);

                  painter->setBrush(m_fillColor);
                  painter->drawEllipse(QPointF(0,0), 50.0, 50.0);

                  painter->setBrush(m_penColor);
                  painter->setPen(QPen(m_penColor, 2.5, Qt::SolidLine, Qt::RoundCap));

                  // eyes
                  if (m_isDead) {
                      painter->drawLine(-30.0, -30.0, -20.0, -20.0);
                      painter->drawLine(-20.0, -30.0, -30.0, -20.0);

                      painter->drawLine(20.0, -30.0, 30.0, -20.0);
                      painter->drawLine(30.0, -30.0, 20.0, -20.0);
                  } else {
                      painter->drawChord(QRectF(-30.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);
                      painter->drawChord(QRectF(5.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);
                  }

                  // mouth
                  if (m_isDead) {
                      painter->drawLine(-28.0, 2.0, 29.0, 2.0);
                  } else {
                      painter->setBrush(QColor(128, 0, 64 ));
                      painter->drawChord(QRectF(-28.0, 2.0-55.0/2.0, 57.0, 55.0), 0.0, -180.0*16);
                  }

                  // pupils
                  if (!m_isDead) {
                      painter->setPen(QPen(m_fillColor, 1.0, Qt::SolidLine, Qt::RoundCap));
                      painter->setBrush(m_fillColor);
                      painter->drawEllipse(QPointF(-12.0, -25.0), 5.0, 5.0);
                      painter->drawEllipse(QPointF(22.0, -25.0), 5.0, 5.0);
                  }
              }
          }
      }