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);
}