Trajectory Class Reference

#include <trajectory.h>

Public Member Functions
QVector< QPointF >	getDDATrajectory (QPointF start, QPointF end, double space)
const QVector< QPointF > &	getLinearTrajectory (const QPointF &start, const QPointF &end, double space)
int	size () const
	Trajectory ()
	~Trajectory ()

Private Member Functions
void	addPoint (QPointF pos)
void	reset ()

Private Attributes
int	m_i
QVector< QPointF >	m_path
int	m_size

Detailed Description

Definition at line 14 of file trajectory.h.

Constructor & Destructor Documentation

Trajectory()

Trajectory::Trajectory

(

)

Definition at line 12 of file trajectory.cpp.

{
    m_i = 0;
    m_size = 0;
}

References m_i, and m_size.

~Trajectory()

Trajectory::~Trajectory

(

)

Definition at line 18 of file trajectory.cpp.

{
}

Member Function Documentation

addPoint()

void Trajectory::addPoint ( QPointF pos )

private

Definition at line 23 of file trajectory.cpp.

{
    if (m_i >= m_path.size()) {
        m_path.append(pos);
        m_i++;
    } else {
        m_path[m_i] = pos;
        m_i++;
    }
 
    m_size++;
}

References m_i, m_path, and m_size.

getDDATrajectory()

QVector< QPointF > Trajectory::getDDATrajectory	(	QPointF	start,
		QPointF	end,
		double	space )

Definition at line 103 of file trajectory.cpp.

{
    Q_UNUSED(space);
    reset();
    // Width and height of the line
    int xd = (int)(end.x() - start.x());
    int yd = (int)(end.y() - start.y());
 
    int x = (int)start.x();
    int y = (int)start.y();
    float fx = start.x();
    float fy = start.y();
    float m = (float)yd / (float)xd;
    int y2 = (int)end.y();
    int x2 = (int)end.x();
 
    if (fabs(m) > 1) {
        int incr;
        if (yd > 0) {
            m = 1.0f / m;
            incr = 1;
        }
        else {
            m = -1.0f / m;
            incr = -1;
        }
        while (y != y2) {
            fx = fx + m;
            y = y + incr;
            x = (int)(fx + 0.5f);
            addPoint(QPointF(x, y));
        }
    } else {
        int incr;
        if (xd > 0) {
            incr = 1;
        }
        else {
            incr = -1;
            m = -m;
        }
        while (x != x2) {
            fy = fy + m;
            x = x + incr;
            y = (int)(fy + 0.5f);
            addPoint(QPointF(x, y));
        }
    }
 
    return m_path;
}

References addPoint(), m_path, and reset().

getLinearTrajectory()

const QVector< QPointF > & Trajectory::getLinearTrajectory	(	const QPointF &	start,
		const QPointF &	end,
		double	space )

Definition at line 44 of file trajectory.cpp.

{
    Q_UNUSED(space);
    reset();
 
    // Width and height of the line
    qreal xd = (end.x() - start.x());
    qreal yd = (end.y() - start.y());
 
    int x = (int)start.x();
    int y = (int)start.y();
    qreal fx = start.x();
    qreal fy = start.y();
    qreal m = yd / xd;
 
    int y2 = (int)end.y();
    int x2 = (int)end.x();
 
    addPoint(start);
 
    if (fabs(m) > 1) {
        // y - directional axis
        int incr;
        if (yd > 0) {
            m = 1.0f / m;
            incr = 1;
        } else {
            m = -1.0f / m;
            incr = -1;
        }
        while (y != y2) {
            fx = fx + m;
            fy = fy + incr;
            y += incr;
//            x = (int)(fx + 0.5f);
            addPoint(QPointF(fx, fy));
        }
    } else {
        // x - directional axis
        int incr;
        if (xd > 0) {
            incr = 1;
        } else {
            incr = -1;
            m = -m;
        }
        while (x != x2) {
            fy = fy + m;
            fx = fx + incr;
            x += incr;
//            y = (int)(fy + 0.5f);
            addPoint(QPointF(fx, fy));
        }
    }
 
    addPoint(end);
    return m_path;
}

References addPoint(), m_path, and reset().

reset()

void Trajectory::reset ( )

private

Definition at line 37 of file trajectory.cpp.

{
    m_size = 0;
    m_i = 0;
}

References m_i, and m_size.

size()

int Trajectory::size ( ) const

inline

Definition at line 23 of file trajectory.h.

                            {
        return m_size;
    }

References m_size.

Member Data Documentation

m_i

int Trajectory::m_i

private

Definition at line 29 of file trajectory.h.

m_path

QVector<QPointF> Trajectory::m_path

private

Definition at line 28 of file trajectory.h.

m_size

int Trajectory::m_size

private

Definition at line 30 of file trajectory.h.

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The documentation for this class was generated from the following files:

• plugins/paintops/hairy/trajectory.h
• plugins/paintops/hairy/trajectory.cpp