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// Copyright (c) 2008 GeometryFactory Sarl (France). // All rights reserved. // // This file is part of CGAL (www.cgal.org). // // $URL: https://github.com/CGAL/cgal/blob/v6.1/GraphicsView/include/CGAL/Qt/RegularGridVectorFieldGraphicsItem.h $ // $Id: include/CGAL/Qt/RegularGridVectorFieldGraphicsItem.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Andreas Fabri // Laurent Rineau #ifndef CGAL_QT_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H #define CGAL_QT_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H #include #include #include #include #include #include #include #include namespace CGAL { namespace Qt { template class RegularGridVectorFieldGraphicsItem : public GraphicsItem { typedef typename T::Geom_traits Geom_traits; typedef typename K::Point_2 Point_2; typedef typename K::Vector_2 Vector_2; typedef typename K::Segment_2 Segment_2; public: RegularGridVectorFieldGraphicsItem(T* t_); void modelChanged(); public: QRectF boundingRect() const; void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); const QPen& verticesPen() const { return vertices_pen; } const QPen& edgesPen() const { return edges_pen; } void setVerticesPen(const QPen& pen) { vertices_pen = pen; } void setEdgesPen(const QPen& pen) { edges_pen = pen; } bool visibleVertices() const { return visible_vertices; } void setVisibleVertices(const bool b) { visible_vertices = b; update(); } bool visibleEdges() const { return visible_edges; } void setVisibleEdges(const bool b) { visible_edges = b; update(); } protected: void updateBoundingBox(); T * rg; QPainter* m_painter; PainterOstream painterostream; QRectF bounding_rect; QPen vertices_pen; QPen edges_pen; bool visible_edges; bool visible_vertices; }; template RegularGridVectorFieldGraphicsItem::RegularGridVectorFieldGraphicsItem(T * t_) : rg(t_), painterostream(0), visible_edges(true), visible_vertices(true) { setVerticesPen(QPen(::Qt::red, 3.)); updateBoundingBox(); setZValue(3); } template QRectF RegularGridVectorFieldGraphicsItem::boundingRect() const { return bounding_rect; } template void RegularGridVectorFieldGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/) { painterostream = PainterOstream(painter); painter->setPen(this->edgesPen()); double w = rg->get_size().first; double h = rg->get_size().second; int nw = rg->get_dimension().first; int nh = rg->get_dimension().second; double dw = w/(nw-1); double dh = h/(nh-1); for(int i = 0; i < nw; i++){ for(int j = 0; j < nh; j++){ Vector_2 v = rg->get_field(i,j); v = (dw*0.45) * v/sqrt(v*v); painterostream << Segment_2(Point_2(i*dw,j*dh), Point_2(i*dw,j*dw)+v); } } painter->setPen(this->verticesPen()); QTransform matrix = painter->worldTransform(); painter->resetTransform(); for(int i = 0; i < nw; i++){ for(int j = 0; j < nh; j++){ painter->drawPoint(matrix.map(QPointF(i*dw, j*dh))); } } } // We let the bounding box only grow, so that when vertices get removed // the maximal bbox gets refreshed in the GraphicsView template void RegularGridVectorFieldGraphicsItem::updateBoundingBox() { bounding_rect = QRectF(0, 0, rg->get_size().first, rg->get_size().second); } template void RegularGridVectorFieldGraphicsItem::modelChanged() { update(); } } // namespace Qt } // namespace CGAL #endif // CGAL_QT_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H