vx4-GuiLin-Gear/scene/picscene.cpp

#if 1
#include "picscene.h"
#include <QDebug>
#include <QRectF>
#include <QPainter>
#include <QGraphicsView>
PicScene::PicScene(QObject *parent) :
    QGraphicsScene(parent),IsdrawBackground(false)
{
}

void PicScene::setMode(Mode mode)
{
    myMode = mode;
}

void PicScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
    if (mouseEvent->button() != Qt::LeftButton)
        return;

    QGraphicsScene::mousePressEvent(mouseEvent);
}

//! [9]

//! [10]
void PicScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
    update();//edit@12-12
#if 0
    if (myMode == InsertLine && line != 0) {
        QLineF newLine(line->line().p1(), mouseEvent->scenePos());
        line->setLine(newLine);
    } else if (myMode == MoveItem) {
        QGraphicsScene::mouseMoveEvent(mouseEvent);
    }
#else
    QGraphicsScene::mouseMoveEvent(mouseEvent);

#endif
}
//! [10]

//! [11]
void PicScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
#if 0 //不需要这个功能
    if (line != 0 && myMode == InsertLine) {
        QList<QGraphicsItem *> startItems = items(line->line().p1());
        if (startItems.count() && startItems.first() == line)
            startItems.removeFirst();
        QList<QGraphicsItem *> endItems = items(line->line().p2());
        if (endItems.count() && endItems.first() == line)
            endItems.removeFirst();

        removeItem(line);
        delete line;
//! [11] //! [12]

        if (startItems.count() > 0 && endItems.count() > 0 &&
            startItems.first()->type() == DiagramItem::Type &&
            endItems.first()->type() == DiagramItem::Type &&
            startItems.first() != endItems.first()) {
            DiagramItem *startItem =
                qgraphicsitem_cast<DiagramItem *>(startItems.first());
            DiagramItem *endItem =
                qgraphicsitem_cast<DiagramItem *>(endItems.first());
            Arrow *arrow = new Arrow(startItem, endItem);
            arrow->setColor(myLineColor);
            startItem->addArrow(arrow);
            endItem->addArrow(arrow);
            arrow->setZValue(-1000.0);
            addItem(arrow);
            arrow->updatePosition();
        }
    }
//! [12] //! [13]
    line = 0;
#endif
    QGraphicsScene::mouseReleaseEvent(mouseEvent);
    //QRectF Rect=QGraphicsScene.itemsBoundingRect();
    //qDebug()<<"GraphicsScene itemsBoundingRect "<<itemsBoundingRect();
    //qDebug()<<"GraphicsScene toRect "<<itemsBoundingRect().pos();
    //qDebug()<<"GraphicsScene rect "<<sceneRect();
    //qDebug()<<"RectF.y "<<itemsBoundingRect().y();
    //qDebug()<<"RectF.height "<<itemsBoundingRect().height();
    //qDebug()<<"RectF.width "<<itemsBoundingRect().width();
    //qDebug()<<"asdfasdf";
    //qDebug()<<"GraphicsScene "<<sceneRect();
    //emit xmlContentChanged();
}
//! [13]

//! [14]
bool PicScene::isItemChange(int type)
{
    foreach (QGraphicsItem *item, selectedItems()) {
        if (item->type() == type)
            return true;
    }
    return false;
}
//! [14]

void PicScene::keyPressEvent(QKeyEvent *event)
{
    QGraphicsScene::keyPressEvent(event);
}
//edit@12-09
void PicScene::drawBackground(QPainter *painter, const QRectF &rect)
{
    QGraphicsScene::drawBackground(painter,rect);

    if(IsdrawBackground)
    {
        Q_UNUSED(rect);
        QPen pen;

        const qreal left=rect.left();
        const qreal right=rect.right();
        const qreal top=rect.top();
        const qreal bottom=rect.bottom();

        const int step=1;
        //pen.setColor(QColor(60,60,60));
        pen.setColor(Qt::lightGray);
        //pen.setColor(Qt::darkCyan);
        pen.setWidth(0);
        //pen.setStyle(Qt::DashLine);
        painter->setPen(pen);
        //绘制横线
        //绘制Y轴正半轴
        for(int i=0;i>=top;i-=step)
        {
            painter->drawLine(left,i,right,i);
        }

        //绘制Y轴负半轴
        for(int i=0;i<=bottom;i+=step)
        {
            painter->drawLine(left,i,right,i);
        }

        //绘制竖线
        //绘制X轴正半轴
        for(int i=0;i<=right;i+=step)
        {
            painter->drawLine(i,top,i,bottom);
        }
        //绘制X轴负半轴
        for(int i=0;i>=left;i-=step)
        {
            painter->drawLine(i,top,i,bottom);
        }

        //edit@12-11
        pen.setColor(Qt::green);
        painter->setPen(pen);
        QRectF BoundingRect=this->itemsBoundingRect();
        BoundingRect.setHeight(32);
        painter->drawRect(BoundingRect);
    }

    emit showTextWidthHeight();
}
//edit@12-09
void PicScene::setIsdrawBackground(bool newIsdrawBackground)
{
    IsdrawBackground = newIsdrawBackground;
}
#endif