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#include "qdirectionrecognizer_p.h"

#include <math.h>

#ifndef M_PI
#define M_PI 3.141592653589793238462643
#endif

QT_BEGIN_NAMESPACE

enum {
    DistanceDelta = 20
};

QDirectionSimpleRecognizer::QDirectionSimpleRecognizer()
{
}

Direction QDirectionSimpleRecognizer::addPosition(const QPoint &pos)
{
    if (!directions.isEmpty()) {
        const QPoint tmp = pos - directions.back().point;
        if (tmp.manhattanLength() < 5)
            return Direction();
    }
    if (lastPoint.isNull()) {
        lastPoint = pos;
        return Direction();
    }
    int dx = pos.x() - lastPoint.x();
    int dy = pos.y() - lastPoint.y();
    Qt::DirectionType direction = Qt::NoDirection;
    if (dx < 0) {
        if (-1*dx >= DistanceDelta/2)
            direction = Qt::LeftDirection;
    } else {
        if (dx >= DistanceDelta/2)
            direction = Qt::RightDirection;
    }
    if (dy < 0) {
        if (-1*dy >= DistanceDelta/2)
            direction = Qt::UpDirection;
    } else {
        if (dy >= DistanceDelta/2)
            direction = Qt::DownDirection;
    }
    if (direction == Qt::NoDirection)
        return Direction();

    lastPoint = pos;
    directions.push_back(Direction(direction, pos));
    return Direction(direction, pos);
}


DirectionList QDirectionSimpleRecognizer::getDirections() const
{
    return directions;
}

void QDirectionSimpleRecognizer::reset()
{
    directions.clear();
    lastPoint = QPoint();
}


/// QDirectionDiagonalRecognizer

QDirectionDiagonalRecognizer::QDirectionDiagonalRecognizer()
{
}

Direction QDirectionDiagonalRecognizer::addPosition(const QPoint &pos)
{
    if (!directions.isEmpty()) {
        const QPoint tmp = pos - directions.back().point;
        if (tmp.manhattanLength() < 5)
            return Direction();
    }
    if (lastPoint.isNull()) {
        lastPoint = pos;
        return Direction();
    }
    int dx = pos.x() - lastPoint.x();
    int dy = pos.y() - lastPoint.y();
    int distance = sqrt(static_cast<double>(dx*dx + dy*dy));
    if (distance < DistanceDelta/2)
        return Direction();

    Qt::DirectionType direction = Qt::NoDirection;
    double angle = atan(1.0*qAbs(lastPoint.y() - pos.y())/qAbs(pos.x() - lastPoint.x())) * 180. / M_PI;
    if (dx < 0 && dy <= 0) {
        angle = 180 - angle;
    } else if (dx <= 0 && dy > 0) {
        angle += 180;
    } else if (dx > 0 && dy > 0) {
        angle = 360-angle;
    }
    if (angle < 0)
        angle += 360;
    if (angle <= 20)
        direction = Qt::RightDirection;
    else if (angle <= 65)
        direction = Qt::RightUpDirection;
    else if (angle <= 110)
        direction = Qt::UpDirection;
    else if (angle <= 155)
        direction = Qt::LeftUpDirection;
    else if (angle <= 200)
        direction = Qt::LeftDirection;
    else if (angle <= 245)
        direction = Qt::LeftDownDirection;
    else if (angle <= 290)
        direction = Qt::DownDirection;
    else if (angle <= 335)
        direction = Qt::RightDownDirection;
    else
        direction = Qt::RightDirection;

    if (direction == Qt::NoDirection)
        return Direction();

    lastPoint = pos;
    directions.push_back(Direction(direction, pos));
    return Direction(direction, pos);
}


DirectionList QDirectionDiagonalRecognizer::getDirections() const
{
    return directions;
}

void QDirectionDiagonalRecognizer::reset()
{
    directions.clear();
    lastPoint = QPoint();
}

QT_END_NAMESPACE