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#include "LSystemGenerator.hpp"
#include "RoadJunctionPoint.hpp"
#include "Road.hpp"
//-----//
#include <cmath>
#include <QImage>
//-----//
#include <QDebug>
//-----//
Utils::Junctions LSystemGenerator::GenerateRoads(const ConfigRoads &c, const QImage *inputImage)
{
const ConfigLSystemRoads conf = *((ConfigLSystemRoads*)&c);
const QSize mapSize = inputImage->size();
//QVector2D tmpVec((float)rand()/RAND_MAX, (float)rand()/RAND_MAX);
QVector2D tmpVec(1, 0);
QList<LSystemState> aStack;
int drawLength = 8,
drawLength2 = 6,
rotationAngle = 90,
rotationAngle2 = 5; // rand(+-x)
LSystemState currentState(QVector2D(mapSize.width() / 2, mapSize.height() / 2),
tmpVec.normalized(),
drawLength);
QString currentWord = conf.system.sInitialWord;
RoadJunctionPoint *rjp = new RoadJunctionPoint(currentState.position);
junctions.push_back(rjp);
for (int i = 0; i < conf.system.iIterations; ++i)
{
QString newWord = "";
for (int j = 0; j < currentWord.length(); ++j)
{
if (conf.system.aRules.contains(currentWord.at(j)))
{
newWord += conf.system.aRules[currentWord.at(j)];
}
else
newWord += currentWord.at(j);
}
currentWord = newWord;
}
for (int j = 0; j < currentWord.length(); ++j)
{
switch (currentWord.at(j).toAscii())
{
case 'X':
currentState.drawLength = drawLength2;
CreateRoad(rjp, currentState, inputImage);
break;
case 'F':
currentState.drawLength = drawLength;
CreateRoad(rjp, currentState, inputImage);
break;
case '+':
currentState.direction = RotateVectorByAngle(currentState.direction, -rotationAngle);
break;
case '-':
currentState.direction = RotateVectorByAngle(currentState.direction, rotationAngle);
break;
case 'R':
currentState.direction = RotateVectorByAngle(currentState.direction, (rand() % (rotationAngle2 * 2 + 1) - rotationAngle2) );
break;
case '[':
aStack.push_back(currentState);
break;
case ']':
currentState = aStack.last();
aStack.pop_back();
break;
}
}
return junctions;
}
//-----//
void LSystemGenerator::CreateRoad(RoadJunctionPoint *rjp, LSystemState &state, const QImage *map)
{
int heightAngles[] = { -30, -22, -15, -8, 0, 8, 15, 22, 30 };
//int heightAngles[] = { 0 };
int num = 9;
Road *r;
Road *lowestSlopeRoad = NULL;
int slope = INT_MAX;
for (int i = 0; i < num; ++i)
{
QVector2D rotation = RotateVectorByAngle(state.direction, heightAngles[i]);
QVector2D newPosition =
Clamp(QVector2D(state.position.x() + state.drawLength * rotation.x(),
state.position.y() + state.drawLength * rotation.y()),
map->size());
r = new Road(state.position, newPosition);
if (ValidPoint(map, newPosition) && r->Valid(map))
{
int heightDiff = abs(qRed(map->pixel(state.position.toPoint())) - qRed(map->pixel(newPosition.toPoint())));
if (heightDiff < slope)
{
slope = heightDiff;
if (lowestSlopeRoad)
delete lowestSlopeRoad;
lowestSlopeRoad = r;
}
else
{
delete r;
}
}
else
delete r;
}
if (lowestSlopeRoad)
{
rjp->AddRoad(lowestSlopeRoad);
state.position = lowestSlopeRoad->End();
}
}
//-----//
bool LSystemGenerator::JunctionExists(const QVector2D &v) const
{
unsigned num = 0;
float epsilon = 2.0f;
RoadJunctionPoint *rjp = junctions.first();
//for (Utils::Junctions::const_iterator iter = junctions.begin(); iter != junctions.end(); ++iter)
{
for (Utils::Roads::const_iterator iter = rjp->StartingRoads().begin(); iter != rjp->StartingRoads().end(); ++iter)
{
QVector2D p1 = (*iter)->Start();
QVector2D p2 = (*iter)->End();
if ((fabs(p1.x() - v.x()) < epsilon && fabs(p1.y() - v.y()) < epsilon) ||
(fabs(p2.x() - v.x()) < epsilon && fabs(p2.y() - v.y()) < epsilon))
{
++num;
}
}
}
return num > 5;
}
//-----//
void LSystemGenerator::FilterRoads()
{
}
//-----//
QVector2D LSystemGenerator::RotateVectorByAngle(const QVector2D &vec, int angle)
{
float tmpSin = sin((float)angle * M_PI / 180);
float tmpCos = cos((float)angle * M_PI / 180);
float tmpPosX = vec.x() * tmpCos - vec.y() * tmpSin;
float tmpPosY = vec.x() * tmpSin + vec.y() * tmpCos;
return QVector2D(tmpPosX, tmpPosY).normalized();
}
//-----//
QVector2D LSystemGenerator::Clamp(const QVector2D pt, const QSize &bounds) const
{
return QVector2D(qBound(0.0, pt.x(), (qreal)bounds.width()),
qBound(0.0, pt.y(), (qreal)bounds.height()));
}
//-----//
bool LSystemGenerator::ValidPoint(const QImage *i, const QVector2D &p) const
{
return i->rect().contains(p.toPoint()) &&
qGray(i->pixel(p.toPoint())) > Utils::LEVEL_WATER
;//&& !JunctionExists(p);
}
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