robot.cpp Example File

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  #include <QtWidgets>

  #include "robot.h"

  RobotPart::RobotPart(QGraphicsItem *parent)
      : QGraphicsObject(parent), color(Qt::lightGray), dragOver(false)
  {
      setAcceptDrops(true);
  }

  void RobotPart::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
  {
      if (event->mimeData()->hasColor()) {
          event->setAccepted(true);
          dragOver = true;
          update();
      } else {
          event->setAccepted(false);
      }
  }

  void RobotPart::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
  {
      Q_UNUSED(event);
      dragOver = false;
      update();
  }

  void RobotPart::dropEvent(QGraphicsSceneDragDropEvent *event)
  {
      dragOver = false;
      if (event->mimeData()->hasColor())
          color = qvariant_cast<QColor>(event->mimeData()->colorData());
      update();
  }

  RobotHead::RobotHead(QGraphicsItem *parent)
      : RobotPart(parent)
  {
  }

  QRectF RobotHead::boundingRect() const
  {
      return QRectF(-15, -50, 30, 50);
  }

  void RobotHead::paint(QPainter *painter,
             const QStyleOptionGraphicsItem *option, QWidget *widget)
  {
      Q_UNUSED(option);
      Q_UNUSED(widget);
      if (pixmap.isNull()) {
          painter->setBrush(dragOver ? color.light(130) : color);
          painter->drawRoundedRect(-10, -30, 20, 30, 25, 25, Qt::RelativeSize);
          painter->setBrush(Qt::white);
          painter->drawEllipse(-7, -3 - 20, 7, 7);
          painter->drawEllipse(0, -3 - 20, 7, 7);
          painter->setBrush(Qt::black);
          painter->drawEllipse(-5, -1 - 20, 2, 2);
          painter->drawEllipse(2, -1 - 20, 2, 2);
          painter->setPen(QPen(Qt::black, 2));
          painter->setBrush(Qt::NoBrush);
          painter->drawArc(-6, -2 - 20, 12, 15, 190 * 16, 160 * 16);
      } else {
          painter->scale(.2272, .2824);
          painter->drawPixmap(QPointF(-15 * 4.4, -50 * 3.54), pixmap);
      }
  }

  void RobotHead::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
  {
      if (event->mimeData()->hasImage()) {
          event->setAccepted(true);
          dragOver = true;
          update();
      } else {
          RobotPart::dragEnterEvent(event);
      }
  }

  void RobotHead::dropEvent(QGraphicsSceneDragDropEvent *event)
  {
      if (event->mimeData()->hasImage()) {
          dragOver = false;
          pixmap = qvariant_cast<QPixmap>(event->mimeData()->imageData());
          update();
      } else {
          RobotPart::dropEvent(event);
      }
  }

  RobotTorso::RobotTorso(QGraphicsItem *parent)
      : RobotPart(parent)
  {
  }

  QRectF RobotTorso::boundingRect() const
  {
      return QRectF(-30, -20, 60, 60);
  }

  void RobotTorso::paint(QPainter *painter,
             const QStyleOptionGraphicsItem *option, QWidget *widget)
  {
      Q_UNUSED(option);
      Q_UNUSED(widget);

      painter->setBrush(dragOver ? color.light(130) : color);
      painter->drawRoundedRect(-20, -20, 40, 60, 25, 25, Qt::RelativeSize);
      painter->drawEllipse(-25, -20, 20, 20);
      painter->drawEllipse(5, -20, 20, 20);
      painter->drawEllipse(-20, 22, 20, 20);
      painter->drawEllipse(0, 22, 20, 20);
  }

  RobotLimb::RobotLimb(QGraphicsItem *parent)
      : RobotPart(parent)
  {
  }

  QRectF RobotLimb::boundingRect() const
  {
      return QRectF(-5, -5, 40, 10);
  }

  void RobotLimb::paint(QPainter *painter,
             const QStyleOptionGraphicsItem *option, QWidget *widget)
  {
      Q_UNUSED(option);
      Q_UNUSED(widget);

      painter->setBrush(dragOver ? color.light(130) : color);
      painter->drawRoundedRect(boundingRect(), 50, 50, Qt::RelativeSize);
      painter->drawEllipse(-5, -5, 10, 10);
  }

  Robot::Robot(QGraphicsItem *parent)
      : RobotPart(parent)
  {
      setFlag(ItemHasNoContents);

      QGraphicsObject *torsoItem = new RobotTorso(this);
      QGraphicsObject *headItem = new RobotHead(torsoItem);
      QGraphicsObject *upperLeftArmItem = new RobotLimb(torsoItem);
      QGraphicsObject *lowerLeftArmItem = new RobotLimb(upperLeftArmItem);
      QGraphicsObject *upperRightArmItem = new RobotLimb(torsoItem);
      QGraphicsObject *lowerRightArmItem = new RobotLimb(upperRightArmItem);
      QGraphicsObject *upperRightLegItem = new RobotLimb(torsoItem);
      QGraphicsObject *lowerRightLegItem = new RobotLimb(upperRightLegItem);
      QGraphicsObject *upperLeftLegItem = new RobotLimb(torsoItem);
      QGraphicsObject *lowerLeftLegItem = new RobotLimb(upperLeftLegItem);

      headItem->setPos(0, -18);
      upperLeftArmItem->setPos(-15, -10);
      lowerLeftArmItem->setPos(30, 0);
      upperRightArmItem->setPos(15, -10);
      lowerRightArmItem->setPos(30, 0);
      upperRightLegItem->setPos(10, 32);
      lowerRightLegItem->setPos(30, 0);
      upperLeftLegItem->setPos(-10, 32);
      lowerLeftLegItem->setPos(30, 0);

      QParallelAnimationGroup *animation = new QParallelAnimationGroup(this);

      QPropertyAnimation *headAnimation = new QPropertyAnimation(headItem, "rotation");
      headAnimation->setStartValue(20);
      headAnimation->setEndValue(-20);
      QPropertyAnimation *headScaleAnimation = new QPropertyAnimation(headItem, "scale");
      headScaleAnimation->setEndValue(1.1);
      animation->addAnimation(headAnimation);
      animation->addAnimation(headScaleAnimation);

      QPropertyAnimation *upperLeftArmAnimation = new QPropertyAnimation(upperLeftArmItem, "rotation");
      upperLeftArmAnimation->setStartValue(190);
      upperLeftArmAnimation->setEndValue(180);
      animation->addAnimation(upperLeftArmAnimation);

      QPropertyAnimation *lowerLeftArmAnimation = new QPropertyAnimation(lowerLeftArmItem, "rotation");
      lowerLeftArmAnimation->setStartValue(50);
      lowerLeftArmAnimation->setEndValue(10);
      animation->addAnimation(lowerLeftArmAnimation);

      QPropertyAnimation *upperRightArmAnimation = new QPropertyAnimation(upperRightArmItem, "rotation");
      upperRightArmAnimation->setStartValue(300);
      upperRightArmAnimation->setEndValue(310);
      animation->addAnimation(upperRightArmAnimation);

      QPropertyAnimation *lowerRightArmAnimation = new QPropertyAnimation(lowerRightArmItem, "rotation");
      lowerRightArmAnimation->setStartValue(0);
      lowerRightArmAnimation->setEndValue(-70);
      animation->addAnimation(lowerRightArmAnimation);

      QPropertyAnimation *upperLeftLegAnimation = new QPropertyAnimation(upperLeftLegItem, "rotation");
      upperLeftLegAnimation->setStartValue(150);
      upperLeftLegAnimation->setEndValue(80);
      animation->addAnimation(upperLeftLegAnimation);

      QPropertyAnimation *lowerLeftLegAnimation = new QPropertyAnimation(lowerLeftLegItem, "rotation");
      lowerLeftLegAnimation->setStartValue(70);
      lowerLeftLegAnimation->setEndValue(10);
      animation->addAnimation(lowerLeftLegAnimation);

      QPropertyAnimation *upperRightLegAnimation = new QPropertyAnimation(upperRightLegItem, "rotation");
      upperRightLegAnimation->setStartValue(40);
      upperRightLegAnimation->setEndValue(120);
      animation->addAnimation(upperRightLegAnimation);

      QPropertyAnimation *lowerRightLegAnimation = new QPropertyAnimation(lowerRightLegItem, "rotation");
      lowerRightLegAnimation->setStartValue(10);
      lowerRightLegAnimation->setEndValue(50);
      animation->addAnimation(lowerRightLegAnimation);

      QPropertyAnimation *torsoAnimation = new QPropertyAnimation(torsoItem, "rotation");
      torsoAnimation->setStartValue(5);
      torsoAnimation->setEndValue(-20);
      animation->addAnimation(torsoAnimation);

      for (int i = 0; i < animation->animationCount(); ++i) {
          QPropertyAnimation *anim = qobject_cast<QPropertyAnimation *>(animation->animationAt(i));
          anim->setEasingCurve(QEasingCurve::SineCurve);
          anim->setDuration(2000);
      }

      animation->setLoopCount(-1);
      animation->start();
  }

  QRectF Robot::boundingRect() const
  {
      return QRectF();
  }

  void Robot::paint(QPainter *painter,
                    const QStyleOptionGraphicsItem *option, QWidget *widget)
  {
      Q_UNUSED(painter);
      Q_UNUSED(option);
      Q_UNUSED(widget);
  }