FuncDemo/src/node.cpp

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#include <Standard_WarningsDisable.hxx>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>
#include <Standard_WarningsRestore.hxx>

#include "edge.h"
#include "node.h"
#include "graphwidget.h"

#include <TFunction_IFunction.hxx>
#include <TFunction_GraphNode.hxx>
#include <TDataStd_Name.hxx>
#include <TDataStd_Tick.hxx>

//! [0]
Node::Node(GraphWidget *graphWidget)
    : graph(graphWidget)
{
    setFlag(ItemIsMovable);
    setFlag(ItemSendsGeometryChanges);
    setCacheMode(DeviceCoordinateCache);
    setZValue(-1);
}
//! [0]

void Node::setFunction(const TDF_Label& func)
{
    myFunction = func;
}

const TDF_Label& Node::getFunction() const
{
    return myFunction;
}

//! [1]
void Node::addEdge(Edge *edge)
{
    edgeList << edge;
    edge->adjust();
}

QList<Edge *> Node::edges() const
{
    return edgeList;
}
//! [1]

//! [2]
void Node::calculateForces()
{
    if (!scene() || scene()->mouseGrabberItem() == this) {
        newPos = pos();
        return;
    }
//! [2]

//! [3]
    // Sum up all forces pushing this item away
    qreal xvel = 0;
    qreal yvel = 0;
    foreach (QGraphicsItem *item, scene()->items()) {
        Node *node = qgraphicsitem_cast<Node *>(item);
        if (!node)
            continue;

        QPointF vec = mapToItem(node, 0, 0);
        qreal dx = vec.x();
        qreal dy = vec.y();
        double l = 2.0 * (dx * dx + dy * dy);
        if (l > 0) {
            xvel += (dx * 150.0) / l;
            yvel += (dy * 150.0) / l;
        }
    }
//! [3]

//! [4]
    // Now subtract all forces pulling items together
    double weight = (edgeList.size() + 1) * 10;
    foreach (Edge *edge, edgeList) {
        QPointF vec;
        if (edge->sourceNode() == this)
            vec = mapToItem(edge->destNode(), 0, 0);
        else
            vec = mapToItem(edge->sourceNode(), 0, 0);
        xvel -= vec.x() / weight;
        yvel -= vec.y() / weight;
    }
//! [4]

//! [5]
    if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
        xvel = yvel = 0;
//! [5]

//! [6]
    QRectF sceneRect = scene()->sceneRect();
    newPos = pos() + QPointF(xvel, yvel);
    newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));
    newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));
}
//! [6]

//! [7]
bool Node::advance()
{
    if (newPos == pos())
        return false;

    setPos(newPos);
    return true;
}
//! [7]

//! [8]
QRectF Node::boundingRect() const
{
#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
    // Add some extra space around the circle for easier touching with finger
    qreal adjust = 30;
    return QRectF( -10 - adjust, -10 - adjust,
                  20 + adjust * 2, 20 + adjust * 2);
#else
    qreal adjust = 2;
    return QRectF( -10 - adjust, -10 - adjust,
                  23 + adjust, 23 + adjust);
#endif
}
//! [8]

//! [9]
QPainterPath Node::shape() const
{
    QPainterPath path;
#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
    // Add some extra space around the circle for easier touching with finger
    path.addEllipse( -40, -40, 80, 80);
#else
    path.addEllipse(-10, -10, 20, 20);
#endif
    return path;
}
//! [9]

//! [10]
void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
    painter->setPen(Qt::NoPen);
    painter->setBrush(Qt::darkGray);
    painter->drawEllipse(-7, -7, 20, 20);

    QColor light_color(Qt::yellow);
    TFunction_IFunction iFunc(myFunction);
    Handle(TFunction_GraphNode) graphNode = iFunc.GetGraphNode();
    TFunction_ExecutionStatus status = graphNode->GetStatus();
    switch (status)
    {
    case TFunction_ES_WrongDefinition:
    case TFunction_ES_Failed:
        light_color = Qt::red;
        break;
    case TFunction_ES_NotExecuted:
        light_color = Qt::green;
        break;
    case TFunction_ES_Executing:
        light_color = Qt::yellow;
        break;
    case TFunction_ES_Succeeded:
        light_color = Qt::blue;
        break;
    }
    if (myFunction.IsAttribute(TDataStd_Tick::GetID()))
        light_color = Qt::white;
    QColor dark_color = light_color.dark(150);

    QRadialGradient gradient(-3, -3, 10);
    if (option->state & QStyle::State_Sunken) {
        gradient.setCenter(3, 3);
        gradient.setFocalPoint(3, 3);
        gradient.setColorAt(1, light_color.light(120));
        gradient.setColorAt(0, dark_color.light(120));
    } else {
        gradient.setColorAt(0, light_color);
        gradient.setColorAt(1, dark_color);
    }
    painter->setBrush(gradient);

    painter->setPen(QPen(Qt::black, 0));
    painter->drawEllipse(-10, -10, 20, 20);

    QString s;
    Handle(TDataStd_Name) n;
    if (myFunction.FindAttribute(TDataStd_Name::GetID(), n))
        s = TCollection_AsciiString(n->Get()).ToCString();
    painter->drawText(-7, 3, s);
}
//! [10]

//! [11]
QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
{
    switch (change) {
    case ItemPositionHasChanged:
        foreach (Edge *edge, edgeList)
            edge->adjust();
        //graph->itemMoved();
        break;
    default:
        break;
    };

    return QGraphicsItem::itemChange(change, value);
}
//! [11]

//! [12]
void Node::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    update();
    QGraphicsItem::mousePressEvent(event);
}

void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    update();
    QGraphicsItem::mouseReleaseEvent(event);
}
//! [12]