stickman.cpp Example File

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

  #include <QPainter>
  #include <QTimer>

  #define _USE_MATH_DEFINES
  #include <math.h>

  #ifndef M_PI
  #define M_PI 3.14159265358979323846
  #endif

  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 = asin(sinAngle) * 180.0 / M_PI;

              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);
              }
          }
      }
  }