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); } } } }