opengl之鼠标交互事件（六）

opengl之鼠标交互事件（六）

代码如下：

void MainWidget::mousePressEvent(QMouseEvent *e)
{
    // Save mouse press position
    mousePressPosition = QVector2D(e->localPos());
}

void MainWidget::mouseReleaseEvent(QMouseEvent *e)
{

}

void MainWidget::mouseMoveEvent(QMouseEvent *e){

    if ((QApplication::keyboardModifiers() == Qt::ShiftModifier) && (e->buttons() & Qt::RightButton))
    {
        // Mouse release position - mouse press position
        QVector2D diff = QVector2D(e->localPos()) - mousePressPosition;
        direct = QVector3D(diff.x(), -diff.y(), 0.0).normalized();
        //translate = QVector3D(diff.x(), -diff.y(), 0.0) + translate;
        qreal acc = diff.length() / 10.0;
        moveSpeed += acc;
    }
    else if ((QApplication::keyboardModifiers() == Qt::ControlModifier) && (e->buttons() & Qt::RightButton))
    {
        // Mouse release position - mouse press position
        QVector2D diff = QVector2D(e->localPos()) - mousePressPosition;

        // Rotation axis is perpendicular to the mouse position difference
        // vector
        QVector3D n = QVector3D(diff.y(), diff.x(), 0.0).normalized();

        // Accelerate angular speed relative to the length of the mouse sweep
        qreal acc = diff.length() / 100.0;

        // Calculate new rotation axis as weighted sum
        rotationAxis = (rotationAxis * angularSpeed + n * acc).normalized();

        // Increase angular speed
        angularSpeed += acc;
    }

}

void MainWidget::timerEvent(QTimerEvent *)
{
    // Decrease angular speed (friction)
    angularSpeed *= 0.60;

    // Stop rotation when speed goes below threshold
    if (angularSpeed < 0.1) {
        angularSpeed = 0.0;
    } else {
        // Update rotation
        rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed) * rotation;

        // Request an update
        update();
    }

    moveSpeed *= 0.80;
    if (moveSpeed < 0.01) {
        moveSpeed = 0.0;
    }else{

        translate = (moveSpeed * direct) + translate;
        update();
    }
}

void MainWidget::wheelEvent(QWheelEvent *e)
{
    e->accept();
    float wheelDelta_deg = e->delta();
    qDebug()<< " wheelDelta_deg :: "<<wheelDelta_deg;

    if (wheelDelta_deg < 0.f)
    {
        zoom = (1.0 + log(-wheelDelta_deg)*0.05) * zoom;
    }
    else if(wheelDelta_deg > 0.f)
    {
        // projectionfovy = 180.0/3.1415962*(atan(0.1*zoom)+0.5*3.1415962);
        zoom = (1.0 - log(wheelDelta_deg)*0.05) * zoom;
        if (zoom < 0.01f)
            zoom = 0.01f;
    }

    update();
}

源代码：

链接：https://pan.baidu.com/s/1zFJKC3Cwz_6fVff56FgStw
提取码：uecq