Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# robot.cpp Example File

graphicsview/dragdroprobot/robot.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include <QtGui>

     #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);
     }