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278 lines
7.5 KiB
C++
278 lines
7.5 KiB
C++
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/*
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* CZonePlacer.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "../CRandomGenerator.h"
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#include "CZonePlacer.h"
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#include "CRmgTemplateZone.h"
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#include "CZoneGraphGenerator.h"
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class CRandomGenerator;
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CPlacedZone::CPlacedZone(const CRmgTemplateZone * zone) : zone(zone)
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{
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}
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CZonePlacer::CZonePlacer(CMapGenerator * Gen) : gen(Gen)
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{
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}
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CZonePlacer::~CZonePlacer()
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{
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}
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int3 CZonePlacer::cords (const float3 f) const
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{
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return int3(std::max(0.f, (f.x * gen->map->width)-1), std::max(0.f, (f.y * gen->map->height-1)), f.z);
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}
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void CZonePlacer::placeZones(const CMapGenOptions * mapGenOptions, CRandomGenerator * rand)
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{
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//gravity-based algorithm
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float gravityConstant = 1e-2;
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float zoneScale = 0.5f; //zones starts small and then inflate
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const float inflateModifier = 1.02;
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logGlobal->infoStream() << "Starting zone placement";
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int width = mapGenOptions->getWidth();
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int height = mapGenOptions->getHeight();
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auto zones = gen->getZones();
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bool underground = mapGenOptions->getHasTwoLevels();
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/*
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let's assume we try to fit N circular zones with radius = size on a map
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formula: sum((prescaler*n)^2)*pi = WH
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prescaler = sqrt((WH)/(sum(n^2)*pi))
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*/
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std::vector<std::pair<TRmgTemplateZoneId, CRmgTemplateZone*>> zonesVector (zones.begin(), zones.end());
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assert (zonesVector.size());
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RandomGeneratorUtil::randomShuffle(zonesVector, *rand);
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TRmgTemplateZoneId firstZone = zones.begin()->first; //we want lowest ID here
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bool undergroundFlag = false;
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float totalSize = 0;
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for (auto zone : zonesVector)
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{
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//even distribution for surface / underground zones. Surface zones always have priority.
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int level = 0;
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if (underground) //only then consider underground zones
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{
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if (zone.first == firstZone)
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{
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level = 0;
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}
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else
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{
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level = undergroundFlag;
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undergroundFlag = !undergroundFlag; //toggle underground on/off
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}
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}
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totalSize += (zone.second->getSize() * zone.second->getSize());
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zone.second->setCenter (float3(rand->nextDouble(0.2, 0.8), rand->nextDouble(0.2, 0.8), level)); //start away from borders
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}
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//prescale zones
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if (underground) //map is twice as big, so zones occupy only half of normal space
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totalSize /= 2;
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float prescaler = sqrt ((width * height) / (totalSize * 3.14f));
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float mapSize = sqrt (width * height);
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for (auto zone : zones)
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{
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zone.second->setSize (zone.second->getSize() * prescaler);
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}
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//gravity-based algorithm. connected zones attract, intersceting zones and map boundaries push back
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auto getDistance = [](float distance) -> float
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{
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return (distance ? distance * distance : 1e-6);
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};
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std::map <CRmgTemplateZone *, float3> forces;
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while (zoneScale < 1) //until zones reach their desired size and fill the map tightly
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{
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for (auto zone : zones)
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{
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float3 forceVector(0,0,0);
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float3 pos = zone.second->getCenter();
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//attract connected zones
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for (auto con : zone.second->getConnections())
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{
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auto otherZone = zones[con];
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float3 otherZoneCenter = otherZone->getCenter();
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float distance = pos.dist2d (otherZoneCenter);
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float minDistance = (zone.second->getSize() + otherZone->getSize())/mapSize * zoneScale; //scale down to (0,1) coordinates
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if (distance > minDistance)
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{
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//WARNING: compiler used to 'optimize' that line so it never actually worked
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forceVector += (((otherZoneCenter - pos) / getDistance(distance))); //positive value
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}
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}
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//separate overlaping zones
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for (auto otherZone : zones)
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{
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float3 otherZoneCenter = otherZone.second->getCenter();
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//zones on different levels don't push away
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if (zone == otherZone || pos.z != otherZoneCenter.z)
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continue;
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float distance = pos.dist2d (otherZoneCenter);
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float minDistance = (zone.second->getSize() + otherZone.second->getSize())/mapSize * zoneScale;
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if (distance < minDistance)
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{
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forceVector -= (otherZoneCenter - pos) / getDistance(distance); //negative value
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}
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}
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//move zones away from boundaries
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//do not scale boundary distance - zones tend to get squashed
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float size = zone.second->getSize() / mapSize;
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auto pushAwayFromBoundary = [&forceVector, pos, &getDistance](float x, float y)
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{
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float3 boundary = float3 (x, y, pos.z);
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float distance = pos.dist2d(boundary);
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forceVector -= (boundary - pos) / getDistance(distance); //negative value
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};
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if (pos.x < size)
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{
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pushAwayFromBoundary(0, pos.y);
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}
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if (pos.x > 1-size)
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{
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pushAwayFromBoundary(1, pos.y);
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}
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if (pos.y < size)
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{
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pushAwayFromBoundary(pos.x, 0);
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}
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if (pos.y > 1-size)
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{
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pushAwayFromBoundary(pos.x, 1);
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}
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forceVector.z = 0; //operator - doesn't preserve z coordinate :/
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forces[zone.second] = forceVector * gravityConstant;
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}
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//update positions
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for (auto zone : forces)
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{
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zone.first->setCenter (zone.first->getCenter() + zone.second);
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}
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zoneScale *= inflateModifier; //increase size
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}
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for (auto zone : zones) //finalize zone positions
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{
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zone.second->setPos(cords(zone.second->getCenter()));
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logGlobal->infoStream() << boost::format ("Placed zone %d at relative position %s and coordinates %s") % zone.first % zone.second->getCenter() % zone.second->getPos();
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}
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}
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float CZonePlacer::metric (const int3 &A, const int3 &B) const
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{
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/*
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Matlab code
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dx = abs(A(1) - B(1)); %distance must be symmetric
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dy = abs(A(2) - B(2));
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d = 0.01 * dx^3 - 0.1618 * dx^2 + 1 * dx + ...
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0.01618 * dy^3 + 0.1 * dy^2 + 0.168 * dy;
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*/
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float dx = abs(A.x - B.x) * scaleX;
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float dy = abs(A.y - B.y) * scaleY;
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//Horner scheme
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return dx * (1 + dx * (0.1 + dx * 0.01)) + dy * (1.618 + dy * (-0.1618 + dy * 0.01618));
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}
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void CZonePlacer::assignZones(const CMapGenOptions * mapGenOptions)
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{
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logGlobal->infoStream() << "Starting zone colouring";
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auto width = mapGenOptions->getWidth();
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auto height = mapGenOptions->getHeight();
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//scale to Medium map to ensure smooth results
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scaleX = 72.f / width;
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scaleY = 72.f / height;
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auto zones = gen->getZones();
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typedef std::pair<CRmgTemplateZone *, float> Dpair;
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std::vector <Dpair> distances;
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distances.reserve(zones.size());
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auto compareByDistance = [](const Dpair & lhs, const Dpair & rhs) -> bool
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{
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return lhs.second < rhs.second;
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};
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int levels = gen->map->twoLevel ? 2 : 1;
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for (int i=0; i<width; i++)
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{
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for(int j=0; j<height; j++)
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{
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for (int k = 0; k < levels; k++)
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{
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distances.clear();
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int3 pos(i, j, k);
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for (auto zone : zones)
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{
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if (zone.second->getPos().z == k)
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distances.push_back (std::make_pair(zone.second, metric(pos, zone.second->getPos())));
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else
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distances.push_back (std::make_pair(zone.second, std::numeric_limits<float>::max()));
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}
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boost::sort (distances, compareByDistance);
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distances.front().first->addTile(pos); //closest tile belongs to zone
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}
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}
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}
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//set position to center of mass
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for (auto zone : zones)
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{
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int3 total(0,0,0);
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auto tiles = zone.second->getTileInfo();
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for (auto tile : tiles)
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{
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total += tile;
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}
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int size = tiles.size();
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assert (size);
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zone.second->setPos (int3(total.x/size, total.y/size, total.z/size));
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//TODO: similiar for islands
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if (zone.second->getPos().z)
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{
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zone.second->discardDistantTiles(gen, zone.second->getSize() + 1);
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//make sure that terrain inside zone is not a rock
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//FIXME: reorder actions?
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zone.second->paintZoneTerrain (gen, ETerrainType::SUBTERRANEAN);
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}
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}
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logGlobal->infoStream() << "Finished zone colouring";
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}
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