QDebug operator<<(QDebug dbg, const QGLCamera &cam)
{
dbg << "QGLCamera";
if (!cam.objectName().isEmpty())
dbg << cam.objectName();
dbg << "\n";
dbg << " projection:" << ( cam.projectionType() == QGLCamera::Perspective ?
"Perspective" : "Orthographic" );
dbg << "-- viewsize:" << cam.viewSize().width() << "x" << cam.viewSize().height() << "\n";
dbg << " near-plane:" << cam.nearPlane() << "-- far-plane:" << cam.farPlane();
dbg << "-- field-of-view:" << cam.fieldOfView() << "\n";
dbg << " rotation:" << cam.screenRotation() << " -- motion adjust:" <<
cam.motionAdjustment() << " -- aspect adjust:" << cam.adjustForAspectRatio() << "\n";
dbg << " eye:" << cam.eye() << "-- center:" << cam.center();
dbg << "-- up:" << cam.upVector() << "\n";
return dbg;
}
// Zoom in and out according to the change in wheel delta.
void QGLGraphicsNavigationItemPrivate::wheel(qreal delta)
{
QGLCamera *camera = viewportItem->camera();
qreal scale = qAbs(viewDelta(delta, delta).x());
if (delta < 0)
scale = -scale;
if (scale >= 0.0f)
scale += 1.0f;
else
scale = 1.0f / (1.0f - scale);
qreal fov = camera->fieldOfView();
if (fov != 0.0f)
camera->setFieldOfView(camera->fieldOfView() / scale);
else
camera->setViewSize(camera->viewSize() / scale);
}
// Convert deltas in the X and Y directions into percentages of
// the view width and height.
QPointF QGLGraphicsNavigationItemPrivate::viewDelta(qreal deltax, qreal deltay)
{
QRectF rect = viewportItem->rect();
qreal w = rect.width();
qreal h = rect.height();
QGLCamera *camera = viewportItem->camera();
bool scaleToWidth;
qreal scaleFactor, scaleX, scaleY;
QSizeF viewSize = camera->viewSize();
if (w >= h) {
if (viewSize.width() >= viewSize.height())
scaleToWidth = true;
else
scaleToWidth = false;
} else {
if (viewSize.width() >= viewSize.height())
scaleToWidth = false;
else
scaleToWidth = true;
}
int rotation = camera->screenRotation();
if (rotation == 90 || rotation == 270) {
scaleToWidth = !scaleToWidth;
qSwap(deltax, deltay);
}
if (rotation == 90 || rotation == 180) {
deltax = -deltax;
}
if (rotation == 180 || rotation == 270) {
deltay = -deltay;
}
if (scaleToWidth) {
scaleFactor = 2.0f / viewSize.width();
scaleX = scaleFactor * h / w;
scaleY = scaleFactor;
} else {
scaleFactor = 2.0f / viewSize.height();
scaleX = scaleFactor;
scaleY = scaleFactor * w / h;
}
return QPointF(deltax * scaleX / w, deltay * scaleY / h);
}
