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// ************************************************************************** //
//
// BornAgain: simulate and fit scattering at grazing incidence
//
//! @file GUI/coregui/Views/SampleDesigner/SampleViewAligner.cpp
//! @brief Implements class SampleViewAligner
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************** //
#include "GUI/coregui/Views/SampleDesigner/SampleViewAligner.h"
#include "GUI/coregui/Models/SampleModel.h"
#include "GUI/coregui/Views/SampleDesigner/DesignerScene.h"
#include "GUI/coregui/Views/SampleDesigner/IView.h"
#include "GUI/coregui/utils/StyleUtils.h"
#include <QModelIndex>
namespace
{
int step_width()
{
return StyleUtils::SizeOfLetterM().width() * 12.5;
}
int step_height()
{
return StyleUtils::SizeOfLetterM().height() * 11;
}
} // namespace
SampleViewAligner::SampleViewAligner(DesignerScene* scene) : m_scene(scene)
{
ASSERT(m_scene);
}
//! Spring based implified algorithm for smart alignment
void SampleViewAligner::smartAlign()
{
m_views.clear();
updateViews();
updateForces();
advance();
}
//! Forms list of all views which are subject for smart alignment (i.e. views
//! which do not have parent view)
void SampleViewAligner::updateViews(const QModelIndex& parentIndex)
{
SampleModel* sampleModel = m_scene->getSampleModel();
for (int i_row = 0; i_row < sampleModel->rowCount(parentIndex); ++i_row) {
QModelIndex itemIndex = sampleModel->index(i_row, 0, parentIndex);
IView* view = getViewForIndex(itemIndex);
if (view && !view->parentObject()) {
m_views.append(view);
}
updateViews(itemIndex);
}
}
//! Calculates forces acting on all views for smart alignment
void SampleViewAligner::updateForces()
{
m_viewToPos.clear();
for (IView* view : m_views) {
calculateForces(view);
}
}
//! Calculates forces acting on single view (simplified force directed spring algorithm)
//! and deduce new position of views.
void SampleViewAligner::calculateForces(IView* view)
{
qreal xvel = 0;
qreal yvel = 0;
// repulsive forces which are pushing items away
double weight1(200.0);
for (IView* other : m_views) {
QPointF vec = view->mapToItem(other, other->boundingRect().center());
qreal dx = view->boundingRect().center().x() - vec.x();
qreal dy = view->boundingRect().center().y() - vec.y();
double l = (dx * dx + dy * dy);
if (l > 0) {
xvel -= (dx * weight1) / l;
yvel -= (dy * weight1) / l;
}
}
// attracting forces which are pulling views together
double weight2(100.0);
for (IView* other : getConnectedViews(view)) {
QPointF vec = view->mapToItem(other, other->boundingRect().center());
qreal dx = view->boundingRect().center().x() - vec.x();
qreal dy = view->boundingRect().center().y() - vec.y();
xvel += dx / weight2;
yvel += dy / weight2;
}
QPointF newPos = view->pos() + QPointF(xvel, yvel);
m_viewToPos[view] = newPos;
}
//! Applies calculated positions to views
void SampleViewAligner::advance()
{
for (IView* view : m_views) {
view->setPos(m_viewToPos[view]);
}
}
//! Returns list of views connected with given view for the subsequent force calculation.
//!
//! Weirdness of given function is due to the fact, that, for example, ParticleLayout view
//! should interact not with Layer view, but with its parent - MultiLayer view.
//! Similarly, MultiLayer is not interacting with its Layers, but directly with the ParticleLayout.
QList<IView*> SampleViewAligner::getConnectedViews(IView* view)
{
QList<IView*> result;
SessionItem* itemOfView = view->getItem();
QList<SessionItem*> connected_items;
if (itemOfView->parent()->modelType() == "Layer") {
// e.g. we are dealing here with ParticleLayout, so we will use directly MultiLayer to
// interact with
connected_items.append(itemOfView->parent()->parent());
} else {
connected_items.append(itemOfView->parent());
}
if (itemOfView->modelType() == "MultiLayer") {
// MultiLayer will not interact with its Layers, but with they children, e.g. with
// ParticleLayouts
for (auto child : itemOfView->children()) {
connected_items.append(child->children().toList());
}
} else {
connected_items.append(itemOfView->children().toList());
}
for (auto item : connected_items) {
IView* view = m_scene->getViewForItem(item);
if (view) {
result.append(view);
}
}
return result;
}
//! Aligns sample starting from
void SampleViewAligner::alignSample(SessionItem* item, QPointF reference, bool force_alignment)
{
ASSERT(item);
alignSample(m_scene->getSampleModel()->indexOfItem(item), reference, force_alignment);
}
//! Aligns sample starting from reference point.
//! If force_alignment=false, view's position will be changed only if it has Null coordinate,
//! if force_alignment=true the position will be changed anyway.
//! Position of View which has parent item (like Layer) will remain unchainged.
void SampleViewAligner::alignSample(const QModelIndex& parentIndex, QPointF reference,
bool force_alignment)
{
SampleModel* sampleModel = m_scene->getSampleModel();
if (IView* view = getViewForIndex(parentIndex)) {
if ((force_alignment || view->pos().isNull()) && !view->parentObject())
view->setPos(reference);
if (view->parentObject()) {
reference = view->mapToScene(view->pos());
} else {
reference = view->pos();
}
}
int child_counter = 0;
for (int i_row = 0; i_row < sampleModel->rowCount(parentIndex); ++i_row) {
QModelIndex itemIndex = sampleModel->index(i_row, 0, parentIndex);
if (!getViewForIndex(itemIndex))
continue;
QPointF child_reference =
reference + QPointF(-step_width(), step_height() * child_counter++);
alignSample(itemIndex, child_reference, force_alignment);
}
}
IView* SampleViewAligner::getViewForIndex(const QModelIndex& index)
{
SampleModel* sampleModel = m_scene->getSampleModel();
SessionItem* item = sampleModel->itemForIndex(index);
return m_scene->getViewForItem(item);
}
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