forked from 0ad/0ad
Ykkrosh
7c2e9027c2
Giant merge from http://svn.wildfiregames.com/hg-source/file/5fb522019d5e Infrastructure is largely complete, gameplay is largely missing Disabled by default; use command-line flag "-sim2" (Second attempt at commit...) This was SVN commit r7259.
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "Selection.h"
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#include "graphics/Camera.h"
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#include "simulation2/Simulation2.h"
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#include "simulation2/components/ICmpSelectable.h"
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#include "simulation2/components/ICmpVisual.h"
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std::vector<entity_id_t> EntitySelection::PickEntitiesAtPoint(CSimulation2& simulation, CCamera& camera, int screenX, int screenY)
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{
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CVector3D origin, dir;
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camera.BuildCameraRay(screenX, screenY, origin, dir);
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std::vector<std::pair<float, entity_id_t> > hits; // (dist^2, entity) pairs
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const CSimulation2::InterfaceList& ents = simulation.GetEntitiesWithInterface(IID_Selectable);
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for (CSimulation2::InterfaceList::const_iterator it = ents.begin(); it != ents.end(); ++it)
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{
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entity_id_t ent = it->first;
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// TODO: ought to filter out units hidden by current player's LOS
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CmpPtr<ICmpVisual> cmpVisual(simulation.GetSimContext(), ent);
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if (cmpVisual.null())
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continue;
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CBound bounds = cmpVisual->GetBounds();
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float tmin, tmax;
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if (!bounds.RayIntersect(origin, dir, tmin, tmax))
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continue;
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// Find the perpendicular distance from the object's centre to the picker ray
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CVector3D centre;
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bounds.GetCentre(centre);
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CVector3D closest = origin + dir * (centre - origin).Dot(dir);
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float dist2 = (closest - centre).LengthSquared();
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hits.push_back(std::make_pair(dist2, ent));
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}
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// Sort hits by distance
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std::sort(hits.begin(), hits.end()); // lexicographic comparison
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// Extract the entity IDs
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std::vector<entity_id_t> hitEnts;
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hitEnts.reserve(hits.size());
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for (size_t i = 0; i < hits.size(); ++i)
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hitEnts.push_back(hits[i].second);
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return hitEnts;
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}
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