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使用 Qt 的縮放功能

C/C++問題 html5模板網(wǎng)
Zoom functionality using Qt(使用 Qt 的縮放功能)
本文介紹了使用 Qt 的縮放功能的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！

問題描述

當(dāng)前實(shí)現(xiàn)，向視圖中心縮放，因此當(dāng)我們縮放時，左上角的項(xiàng)目或當(dāng)前鼠標(biāo)指針不可見.

我想要基于當(dāng)前鼠標(biāo)指針的縮放功能，以便當(dāng)前鼠標(biāo)指針上的項(xiàng)目向視圖中心縮放.

Zoom base on 視區(qū)中心代碼

void csGuiView::wheelEvent(QWheelEvent *event){if ((event->modifiers()&Qt::ControlModifier) == Qt::ControlModifier&&事件->angleDelta().x() == 0){QPoint pos = event->pos();QPointF posf = this->mapToScene(pos);雙角 = 事件->angleDelta().y();雙倍比例因子；如果(角度＞0){縮放系數(shù) = 1 + ( 角度/360 * 0.1);}else if (angle <0){縮放系數(shù) = 1 - ( -angle/360 * 0.1);} 別的{縮放因子 = 1;}m_pvtData->m_scale = scalingFactor;this-> scale(scalingFactor, scalingFactor);double w = this->viewport()->width();double h = this->viewport()->height();double wf = this->mapToScene(QPoint(w-1, 0)).x()- 這個->mapToScene(QPoint(0,0)).x();double hf = this->mapToScene(QPoint(0, h-1)).y()- this->mapToScene(QPoint(0,0)).y();雙 lf = posf.x() - pos.x() * wf/w;雙 tf = posf.y() - pos.y() * hf/h;/* 嘗試正確設(shè)置視口 */this->ensureVisible(lf, tf, wf, hf, 0, 0);QPointF newPos = this->mapToScene(pos);this->ensureVisible(QRectF(QPointF(lf, tf) - newPos + posf,QSizeF(wf, hf)), 0, 0);}if ((event->modifiers()&Qt::ControlModifier) != Qt::ControlModifier) {QGraphicsView::wheelEvent(事件);}事件->接受()；}

解決方案

縮放總是以鼠標(biāo)指針為中心 -ndash;鼠標(biāo)指針的位置只需要成為縮放的原點(diǎn)即可.

聽起來很簡單，但我在準(zhǔn)備演示時有點(diǎn)費(fèi)勁.(我的線性代數(shù)不是很好，抱歉.)不過，我終于讓它運(yùn)行起來了.

我的示例代碼testQWidget-Zoom.cc:

#include <向量>#include //用于演示縮放的小部件類類畫布:公共 QWidget {//類型:私人的:結(jié)構(gòu)地理{QRectF 矩形；QColor顏色；地理(const QRectF &rect，const QColor &color):矩形(矩形)，顏色(顏色){ }};//變量:私人的:布爾 _initDone : 1;//flag: true ... 示例地理創(chuàng)建std::vector_場景;//要渲染的內(nèi)容QMatrix_mat;//查看矩陣//方法:民眾://構(gòu)造函數(shù).畫布():QWidget()，_initDone(假){}//析構(gòu)函數(shù).虛擬 ~Canvas() = 默認(rèn)值；//禁用:Canvas(const Canvas&) = 刪除；帆布&運(yùn)算符=(const Canvas&) = 刪除；私人的://初始化樣本地理無效初始化(){如果(_initDone)返回；_initDone = 真；//構(gòu)建場景(使用 NDC，即查看 x/y 范圍:[-1, 1])_scene.emplace_back(Geo(QRectF(-1.0f, -1.0f, 2.0f, 2.0f), QColor(0x000000u)));_scene.emplace_back(Geo(QRectF(-0.2f, -0.2f, 0.4f, 0.4f), QColor(0x00ff00u)));_scene.emplace_back(Geo(QRectF(-0.8f, -0.8f, 0.4f, 0.4f), QColor(0xff0000u)));_scene.emplace_back(Geo(QRectF(-0.8f, 0.4f, 0.4f, 0.4f), QColor(0x0000ffu)));_scene.emplace_back(Geo(QRectF(0.4f, 0.4f, 0.4f, 0.4f), QColor(0xff00ffu)));_scene.emplace_back(Geo(QRectF(0.4f, -0.8f, 0.4f, 0.4f), QColor(0xffff00u)));//獲取初始縮放const int wView = width(), hView = height();_mat.scale(wView/2, hView/2);_mat.translate(1, 1);}受保護(hù):虛擬無效paintEvent(QPaintEvent * pQEvent)覆蓋{在里面();//使成為QPainter qPainter(this);#if 0//這也會縮放線寬:qPainter.setMatrix(_mat);for (const Geo &geo : _scene) {qPainter.setPen(geo.color);qPainter.drawRect(geo.rect);}#else//這僅轉(zhuǎn)換坐標(biāo):for (const Geo &geo : _scene) {qPainter.setPen(geo.color);QRectF rect(geo.rect.topLeft() * _mat, geo.rect.bottomRight() * _mat);qPainter.drawRect(rect);}#endif//0}虛擬無效輪事件(QWheelEvent *pQEvent)覆蓋{//qDebug() <<車輪事件:"http://qDebug() <<鼠標(biāo)位置:"<<pQEvent->pos();//pos() ->虛擬畫布bool matInvOK = false;QMatrix matInv = _mat.inverted(&matInvOK);如果(！matInvOK){qDebug() <<"視圖矩陣不可逆！";返回;}QPointF posNDC= QPointF(pQEvent->pos().x(), pQEvent->pos().y()) * matInv;//qDebug() <<鼠標(biāo)位置(NDC):"<<posNDC;float delta = 1.0f + pQEvent->angleDelta().y()/1200.0f;//qDebug() <<angleDelta:"<<pQEvent->angleDelta().y();//qDebug() <<比例因子:"<<三角洲;_mat.translate(posNDC.x(), posNDC.y());//原點(diǎn)定位_mat.scale(delta, delta);//規(guī)模_mat.translate(-posNDC.x(), -posNDC.y());//點(diǎn)到原點(diǎn)更新();pQEvent->accept();}};int main(int argc, char **argv){QApplication app(argc, argv);帆布帆布；canvas.resize(512, 512);畫布.show();//運(yùn)行時循環(huán)返回 app.exec();}

這三行是??真正有趣的(在Canvas::wheelEvent()中):

 _mat.translate(posNDC.x(), posNDC.y());//原點(diǎn)定位_mat.scale(delta, delta);//規(guī)模_mat.translate(-posNDC.x(), -posNDC.y());//點(diǎn)到原點(diǎn)

這是它的樣子:

第一張圖片是應(yīng)用程序啟動后的快照.

然后我指向紅色矩形的中心并輕輕轉(zhuǎn)動輪子.紅色矩形按預(yù)期圍繞鼠標(biāo)指針增長.

<小時>

1st 更新:

而且，這是直接使用屏幕坐標(biāo)的更新版本(而不是將所有內(nèi)容都轉(zhuǎn)換為 NDC):

#include <向量>#include //用于演示縮放的小部件類類畫布:公共 QWidget {//類型:私人的:結(jié)構(gòu)地理{QRectF 矩形；QColor顏色；地理(const QRectF &rect，const QColor &color):矩形(矩形)，顏色(顏色){ }};//變量:私人的:布爾 _initDone : 1;//flag: true ... 示例地理創(chuàng)建std::vector_場景;//要渲染的內(nèi)容QMatrix_mat;//查看矩陣//方法:民眾://構(gòu)造函數(shù).畫布():QWidget()，_initDone(假){}//析構(gòu)函數(shù).虛擬 ~Canvas() = 默認(rèn)值；//禁用:Canvas(const Canvas&) = 刪除；帆布&運(yùn)算符=(const Canvas&) = 刪除；私人的://初始化樣本地理無效初始化(){如果(_initDone)返回；_initDone = 真；const int wView = width(), hView = height();//構(gòu)建場景(使用 NDC，即查看 x/y 范圍:[-1, 1])_scene.emplace_back(Geo(QRectF(-1.0f, -1.0f, 2.0f, 2.0f), QColor(0x000000u)));_scene.emplace_back(Geo(QRectF(-0.2f, -0.2f, 0.4f, 0.4f), QColor(0x00ff00u)));_scene.emplace_back(Geo(QRectF(-0.8f, -0.8f, 0.4f, 0.4f), QColor(0xff0000u)));_scene.emplace_back(Geo(QRectF(-0.8f, 0.4f, 0.4f, 0.4f), QColor(0x0000ffu)));_scene.emplace_back(Geo(QRectF(0.4f, 0.4f, 0.4f, 0.4f), QColor(0xff00ffu)));_scene.emplace_back(Geo(QRectF(0.4f, -0.8f, 0.4f, 0.4f), QColor(0xffff00u)));//縮放幾何到屏幕坐標(biāo)Q矩陣墊；mat.scale(wView/2, hView/2);mat.translate(1, 1);for (Geo &geo : _scene) {geo.rect = QRectF(geo.rect.topLeft() * mat, geo.rect.bottomRight() * mat);}}受保護(hù):虛擬無效paintEvent(QPaintEvent * pQEvent)覆蓋{在里面();//使成為QPainter qPainter(this);qPainter.setMatrix(_mat);for (const Geo &geo : _scene) {qPainter.setPen(geo.color);qPainter.drawRect(geo.rect);}}虛擬無效輪事件(QWheelEvent *pQEvent)覆蓋{//qDebug() <<"輪子事件:";//qDebug() <<鼠標(biāo)位置:"<<pQEvent->pos();float delta = 1.0f + pQEvent->angleDelta().y()/1200.0f;//qDebug() <<angleDelta:"<<pQEvent->angleDelta().y();//qDebug() <<比例因子:"<<三角洲;_mat.translate(pQEvent->pos().x(), pQEvent->pos().y());//原點(diǎn)定位_mat.scale(delta, delta);//規(guī)模_mat.translate(-pQEvent->pos().x(), -pQEvent->pos().y());//點(diǎn)到原點(diǎn)更新();pQEvent->accept();}};int main(int argc, char **argv){QApplication app(argc, argv);帆布帆布；canvas.resize(256, 256);畫布.show();//運(yùn)行時循環(huán)返回 app.exec();}

相關(guān)的三行變化不大–鼠標(biāo)坐標(biāo)直接應(yīng)用于變換.

順便說一句.我改變了渲染–它現(xiàn)在可以像我使用的一樣縮放線寬

 qPainter.setMatrix(_mat);

在 Canvas::paintEvent() 中，而不是手動"轉(zhuǎn)換所有點(diǎn).

我指向藍(lán)色矩形的中心并轉(zhuǎn)動鼠標(biāo)滾輪后的快照顯示:

<小時>

2nd 更新:

建議的矩陣操作在

Current implementation, zooms towards the center of View so items present in the top left corner or the current mouse pointer is not visible when we Zoom it.

I want zoom functionality based on the current mouse pointer so items present on the current mouse pointer zoom towards the center of the view.

Code for Zoom base don center of view area

void csGuiView::wheelEvent(QWheelEvent *event)
{

    if ((event->modifiers()&Qt::ControlModifier) == Qt::ControlModifier
        && event->angleDelta().x() == 0)
    {
    QPoint  pos  = event->pos();
    QPointF posf = this->mapToScene(pos);

    double angle = event->angleDelta().y();

    double scalingFactor;

    if(angle > 0)
    {
        scalingFactor = 1 + ( angle / 360 * 0.1);
    }else if (angle < 0)
    {
        scalingFactor = 1 - ( -angle / 360 * 0.1);
    } else
    {
        scalingFactor = 1;
    }

    m_pvtData->m_scale = scalingFactor;

    this->scale(scalingFactor, scalingFactor);

    double w = this->viewport()->width();
    double h = this->viewport()->height();

    double wf = this->mapToScene(QPoint(w-1, 0)).x()
            - this->mapToScene(QPoint(0,0)).x();
    double hf = this->mapToScene(QPoint(0, h-1)).y()
            - this->mapToScene(QPoint(0,0)).y();

    double lf = posf.x() - pos.x() * wf / w;
    double tf = posf.y() - pos.y() * hf / h;

    /* try to set viewport properly */
    this->ensureVisible(lf, tf, wf, hf, 0, 0);


    QPointF newPos = this->mapToScene(pos);


    this->ensureVisible(QRectF(QPointF(lf, tf) - newPos + posf,
                               QSizeF(wf, hf)), 0, 0);

    }

    if ((event->modifiers()&Qt::ControlModifier) != Qt::ControlModifier) {
    QGraphicsView::wheelEvent(event);
    }

    event->accept();
}

解決方案

To zoom always centered at mouse pointer – the position of mouse pointer just has to become the origin of scaling.

It sounds that simple but I struggled a bit to prepare a demonstration. (I'm not that good in linear algebra, sorry.) However, I finally got it running.

My sample code testQWidget-Zoom.cc:

#include <vector>
#include <QtWidgets>

// class for widget to demonstrate zooming
class Canvas: public QWidget {
  // types:
  private:
    struct Geo {
      QRectF rect; QColor color;
      Geo(const QRectF &rect, const QColor &color):
        rect(rect), color(color)
      { }
    };
  // variables:
  private:
    bool _initDone : 1; // flag: true ... sample geo created
    std::vector<Geo> _scene; // contents to render
    QMatrix _mat; // view matrix
  // methods:
  public: 
    // constructor.
    Canvas(): QWidget(), _initDone(false) { }
    // destructor.
    virtual ~Canvas() = default;
    // disabled:
    Canvas(const Canvas&) = delete;
    Canvas& operator=(const Canvas&) = delete;
  private:
    // initializes sample geo
    void init()
    {
      if (_initDone) return;
      _initDone = true;
      // build scene (with NDC i.e. view x/y range: [-1, 1])
      _scene.emplace_back(Geo(QRectF(-1.0f, -1.0f, 2.0f, 2.0f), QColor(0x000000u)));
      _scene.emplace_back(Geo(QRectF(-0.2f, -0.2f, 0.4f, 0.4f), QColor(0x00ff00u)));
      _scene.emplace_back(Geo(QRectF(-0.8f, -0.8f, 0.4f, 0.4f), QColor(0xff0000u)));
      _scene.emplace_back(Geo(QRectF(-0.8f, 0.4f, 0.4f, 0.4f), QColor(0x0000ffu)));
      _scene.emplace_back(Geo(QRectF(0.4f, 0.4f, 0.4f, 0.4f), QColor(0xff00ffu)));
      _scene.emplace_back(Geo(QRectF(0.4f, -0.8f, 0.4f, 0.4f), QColor(0xffff00u)));
      // get initial scaling
      const int wView = width(), hView = height();
      _mat.scale(wView / 2, hView / 2);
      _mat.translate(1, 1);
    }
  protected:
    virtual void paintEvent(QPaintEvent *pQEvent) override
    {
      init();
      // render
      QPainter qPainter(this);
#if 0 // This scales line width as well:
      qPainter.setMatrix(_mat);
      for (const Geo &geo : _scene) {
        qPainter.setPen(geo.color);
        qPainter.drawRect(geo.rect);
      }
#else // This transforms only coordinates:
      for (const Geo &geo : _scene) {
        qPainter.setPen(geo.color);
        QRectF rect(geo.rect.topLeft() * _mat, geo.rect.bottomRight() * _mat);
        qPainter.drawRect(rect);
      }
#endif // 0
    }
    virtual void wheelEvent(QWheelEvent *pQEvent) override
    {
      //qDebug() << "Wheel Event:"
      //qDebug() << "mouse pos:" << pQEvent->pos();
      // pos() -> virtual canvas
      bool matInvOK = false;
      QMatrix matInv = _mat.inverted(&matInvOK);
      if (!matInvOK) {
        qDebug() << "View matrix not invertible!";
        return;
      }
      QPointF posNDC
        = QPointF(pQEvent->pos().x(), pQEvent->pos().y()) * matInv;
      //qDebug() << "mouse pos (NDC):" << posNDC;
      float delta = 1.0f + pQEvent->angleDelta().y() / 1200.0f;
      //qDebug() << "angleDelta:" << pQEvent->angleDelta().y();
      //qDebug() << "scale factor:" << delta;
      _mat.translate(posNDC.x(), posNDC.y()); // origin to spot
      _mat.scale(delta, delta); // scale
      _mat.translate(-posNDC.x(), -posNDC.y()); // spot to origin
      update();
      pQEvent->accept();
    }
};


int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  Canvas canvas;
  canvas.resize(512, 512);
  canvas.show();
  // runtime loop
  return app.exec();
}

and these three lines are the actual interesting ones (in Canvas::wheelEvent()):

      _mat.translate(posNDC.x(), posNDC.y()); // origin to spot
      _mat.scale(delta, delta); // scale
      _mat.translate(-posNDC.x(), -posNDC.y()); // spot to origin

And this is how it looks:

The first image is a snapshot of the application just after starting it.

Then I pointed into the center of the red rectangle and turned the wheel slightly. The red rectangle grew around the mouse pointer as intended.

1st Update:

And, this is the updated version which uses screen coordinates directly (instead of converting everything to NDCs):

#include <vector>
#include <QtWidgets>

// class for widget to demonstrate zooming
class Canvas: public QWidget {
  // types:
  private:
    struct Geo {
      QRectF rect; QColor color;
      Geo(const QRectF &rect, const QColor &color):
        rect(rect), color(color)
      { }
    };
  // variables:
  private:
    bool _initDone : 1; // flag: true ... sample geo created
    std::vector<Geo> _scene; // contents to render
    QMatrix _mat; // view matrix
  // methods:
  public: 
    // constructor.
    Canvas(): QWidget(), _initDone(false) { }
    // destructor.
    virtual ~Canvas() = default;
    // disabled:
    Canvas(const Canvas&) = delete;
    Canvas& operator=(const Canvas&) = delete;
  private:
    // initializes sample geo
    void init()
    {
      if (_initDone) return;
      _initDone = true;
      const int wView = width(), hView = height();
      // build scene (with NDC i.e. view x/y range: [-1, 1])
      _scene.emplace_back(Geo(QRectF(-1.0f, -1.0f, 2.0f, 2.0f), QColor(0x000000u)));
      _scene.emplace_back(Geo(QRectF(-0.2f, -0.2f, 0.4f, 0.4f), QColor(0x00ff00u)));
      _scene.emplace_back(Geo(QRectF(-0.8f, -0.8f, 0.4f, 0.4f), QColor(0xff0000u)));
      _scene.emplace_back(Geo(QRectF(-0.8f, 0.4f, 0.4f, 0.4f), QColor(0x0000ffu)));
      _scene.emplace_back(Geo(QRectF(0.4f, 0.4f, 0.4f, 0.4f), QColor(0xff00ffu)));
      _scene.emplace_back(Geo(QRectF(0.4f, -0.8f, 0.4f, 0.4f), QColor(0xffff00u)));
      // scale geometry to screen coordinates
      QMatrix mat;
      mat.scale(wView / 2, hView / 2);
      mat.translate(1, 1);
      for (Geo &geo : _scene) {
        geo.rect = QRectF(geo.rect.topLeft() * mat, geo.rect.bottomRight() * mat);
      }
    }
  protected:
    virtual void paintEvent(QPaintEvent *pQEvent) override
    {
      init();
      // render
      QPainter qPainter(this);
      qPainter.setMatrix(_mat);
      for (const Geo &geo : _scene) {
        qPainter.setPen(geo.color);
        qPainter.drawRect(geo.rect);
      }
    }
    virtual void wheelEvent(QWheelEvent *pQEvent) override
    {
      //qDebug() << "Wheel Event:";
      //qDebug() << "mouse pos:" << pQEvent->pos();
      float delta = 1.0f + pQEvent->angleDelta().y() / 1200.0f;
      //qDebug() << "angleDelta:" << pQEvent->angleDelta().y();
      //qDebug() << "scale factor:" << delta;
      _mat.translate(pQEvent->pos().x(), pQEvent->pos().y()); // origin to spot
      _mat.scale(delta, delta); // scale
      _mat.translate(-pQEvent->pos().x(), -pQEvent->pos().y()); // spot to origin
      update();
      pQEvent->accept();
    }
};

int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  Canvas canvas;
  canvas.resize(256, 256);
  canvas.show();
  // runtime loop
  return app.exec();
}

The relevant three lines didn't change much – the mouse coordinates are applied directly to transformation.

Btw. I changed the rendering – it now scales line width as well as I used

      qPainter.setMatrix(_mat);

in Canvas::paintEvent() instead of transforming all points "manually".

The snapshot shows the application after I pointed into the center of the blue rectangle and turned the mouse wheel:

2nd Update:

The suggested matrix manipulation works in a QGraphicsView as well:

#include <QtWidgets>

// class for widget to demonstrate zooming
class Canvas: public QGraphicsView {
  // methods:
  public: 
    // constructor.
    Canvas() = default;
    // destructor.
    virtual ~Canvas() = default;
    // disabled:
    Canvas(const Canvas&) = delete;
    Canvas& operator=(const Canvas&) = delete;

  protected:

    virtual void wheelEvent(QWheelEvent *pQEvent) override
    {
      //qDebug() << "Wheel Event:";
      // pos() -> virtual canvas
      QPointF pos = mapToScene(pQEvent->pos());
      //qDebug() << "mouse pos:" << pos;
      // scale from wheel angle
      float delta = 1.0f + pQEvent->angleDelta().y() / 1200.0f;
      //qDebug() << "angleDelta:" << pQEvent->angleDelta().y();
      //qDebug() << "scale factor:" << delta;
      // modify transform matrix
      QTransform xform = transform();
      xform.translate(pos.x(), pos.y()); // origin to spot
      xform.scale(delta, delta); // scale
      xform.translate(-pos.x(), -pos.y()); // spot to origin
      setTransform(xform);
      //qDebug() << "transform:" << xform;
      // force update
      update();
      pQEvent->accept();
    }
};

QRectF toScr(QWidget *pQWidget, float x, float y, float w, float h)
{
  const int wView = pQWidget->width(), hView = pQWidget->height();
  const int s = wView < hView ? wView : hView;
  return QRectF(
    (0.5f * x + 0.5f) * s, (0.5f * y + 0.5f) * s,
    0.5f * w * s, 0.5f * h * s);
}

int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  // setup GUI
  Canvas canvas;
  canvas.setTransformationAnchor(QGraphicsView::NoAnchor);
  canvas.resize(256, 256);
  canvas.show();
  // prepare scene
  QGraphicsScene qGScene;
  qGScene.addRect(toScr(canvas.viewport(), -1.0f, -1.0f, 2.0f, 2.0f), QColor(0x000000u));
  qGScene.addRect(toScr(canvas.viewport(), -0.2f, -0.2f, 0.4f, 0.4f), QColor(0x00ff00u));
  qGScene.addRect(toScr(canvas.viewport(), -0.8f, -0.8f, 0.4f, 0.4f), QColor(0xff0000u));
  qGScene.addRect(toScr(canvas.viewport(), -0.8f, 0.4f, 0.4f, 0.4f), QColor(0x0000ffu));
  qGScene.addRect(toScr(canvas.viewport(), 0.4f, 0.4f, 0.4f, 0.4f), QColor(0xff00ffu));
  qGScene.addRect(toScr(canvas.viewport(), 0.4f, -0.8f, 0.4f, 0.4f), QColor(0xffff00u));
  canvas.setScene(&qGScene);
  // runtime loop
  return app.exec();
}

Using a QGraphicsView simplifies code as no rendering code is needed – it's already built-in.

As I have not (yet) much experience with QGraphicsView, another issue hit me quite hard: The QGraphicsView is able to fix the view position automati[cg]ally after a transformation has been applied. In my case, this was rather counter-productive as obviously my transformation and the QGraphicsView seemed to "pull" in opposite directions.

Hence, I've learnt my lesson of the day: QGrapicsView::setTransformationAnchor(QGraphicsView::NoAnchor) is necessary to switch off this (in my case not-intended) auto-centering.

The other detail I find worth to notice is QGraphicsView::mapToScene() which can be used to conveniently convert widget coordinates (e.g. mouse coordinates) to scene space.

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