mouse.cpp Example File

touch/pinchzoom/mouse.cpp
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#include "mouse.h" #include <QGraphicsScene> #include <QPainter> #include <QRandomGenerator> #include <QStyleOption> #include <qmath.h> const qreal Pi = M_PI; const qreal TwoPi = 2 * M_PI; static qreal normalizeAngle(qreal angle) { while (angle < 0) angle += TwoPi; while (angle > TwoPi) angle -= TwoPi; return angle; } Mouse::Mouse() : angle(0), speed(0), mouseEyeDirection(0), color(QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(256)) { setTransform(QTransform().rotate(QRandomGenerator::global()->bounded(360 * 16)), true); startTimer(1000 / 33); } QRectF Mouse::boundingRect() const { qreal adjust = 0.5; return QRectF(-18 - adjust, -22 - adjust, 36 + adjust, 60 + adjust); } QPainterPath Mouse::shape() const { QPainterPath path; path.addRect(-10, -20, 20, 40); return path; } void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) { // Body painter->setBrush(color); painter->drawEllipse(-10, -20, 20, 40); // Eyes painter->setBrush(Qt::white); painter->drawEllipse(-10, -17, 8, 8); painter->drawEllipse(2, -17, 8, 8); // Nose painter->setBrush(Qt::black); painter->drawEllipse(QRectF(-2, -22, 4, 4)); // Pupils painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4)); painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4)); // Ears painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red); painter->drawEllipse(-17, -12, 16, 16); painter->drawEllipse(1, -12, 16, 16); // Tail QPainterPath path(QPointF(0, 20)); path.cubicTo(-5, 22, -5, 22, 0, 25); path.cubicTo(5, 27, 5, 32, 0, 30); path.cubicTo(-5, 32, -5, 42, 0, 35); painter->setBrush(Qt::NoBrush); painter->drawPath(path); } void Mouse::timerEvent(QTimerEvent *) { // Don't move too far away QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0)); if (lineToCenter.length() > 150) { qreal angleToCenter = std::atan2(lineToCenter.dy(), lineToCenter.dx()); angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2); if (angleToCenter < Pi && angleToCenter > Pi / 4) { // Rotate left angle += (angle < -Pi / 2) ? 0.25 : -0.25; } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) { // Rotate right angle += (angle < Pi / 2) ? 0.25 : -0.25; } } else if (::sin(angle) < 0) { angle += 0.25; } else if (::sin(angle) > 0) { angle -= 0.25; } // Try not to crash with any other mice QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF() << mapToScene(0, 0) << mapToScene(-30, -50) << mapToScene(30, -50)); foreach (QGraphicsItem *item, dangerMice) { if (item == this) continue; QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0)); qreal angleToMouse = std::atan2(lineToMouse.dy(), lineToMouse.dx()); angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2); if (angleToMouse >= 0 && angleToMouse < Pi / 2) { // Rotate right angle += 0.5; } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) { // Rotate left angle -= 0.5; } } // Add some random movement if (dangerMice.size() > 1 && QRandomGenerator::global()->bounded(10) == 0) { if (QRandomGenerator::global()->bounded(1)) angle += QRandomGenerator::global()->bounded(1 / 500.0); else angle -= QRandomGenerator::global()->bounded(1 / 500.0); } speed += (-50 + QRandomGenerator::global()->bounded(100)) / 100.0; qreal dx = ::sin(angle) * 10; mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5; setTransform(QTransform().rotate(dx), true); setPos(mapToParent(0, -(3 + sin(speed) * 3))); }

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