KisStrokeSpeedMeasurer Class Reference

#include <KisStrokeSpeedMeasurer.h>

Classes
struct	Private

Public Member Functions
void	addSample (const QPointF &pt, int time)
void	addSamples (const QVector< QPointF > &points, int time)
qreal	averageSpeed () const
qreal	currentSpeed () const
	KisStrokeSpeedMeasurer (int timeSmoothWindow)
qreal	maxSpeed () const
void	reset ()
	~KisStrokeSpeedMeasurer ()

Private Member Functions
void	sampleMaxSpeed ()

Private Attributes
const QScopedPointer< Private >	m_d

Detailed Description

Definition at line 18 of file KisStrokeSpeedMeasurer.h.

Constructor & Destructor Documentation

KisStrokeSpeedMeasurer()

KisStrokeSpeedMeasurer::KisStrokeSpeedMeasurer

(

int

timeSmoothWindow

)

Definition at line 36 of file KisStrokeSpeedMeasurer.cpp.

    : m_d(new Private())
{
    m_d->timeSmoothWindow = timeSmoothWindow;
}

References m_d.

~KisStrokeSpeedMeasurer()

KisStrokeSpeedMeasurer::~KisStrokeSpeedMeasurer

(

)

Definition at line 42 of file KisStrokeSpeedMeasurer.cpp.

{
}

Member Function Documentation

addSample()

void KisStrokeSpeedMeasurer::addSample	(	const QPointF &	pt,
		int	time )

Definition at line 66 of file KisStrokeSpeedMeasurer.cpp.

{
    m_d->addSampleImpl(pt, time);
    m_d->purgeOldSamples();
    sampleMaxSpeed();
}

References m_d, and sampleMaxSpeed().

addSamples()

void KisStrokeSpeedMeasurer::addSamples	(	const QVector< QPointF > &	points,
		int	time )

Definition at line 73 of file KisStrokeSpeedMeasurer.cpp.

{
    const int lastSampleTime = !m_d->samples.isEmpty() ? m_d->samples.last().time : 0;
 
    const int timeSmoothBase = qMin(lastSampleTime, time);
    const qreal timeSmoothStep = qreal(time - timeSmoothBase) / points.size();
 
    for (int i = 0; i < points.size(); i++) {
        const int sampleTime = timeSmoothBase + timeSmoothStep * (i + 1);
        m_d->addSampleImpl(points[i], sampleTime);
    }
 
    m_d->purgeOldSamples();
    sampleMaxSpeed();
}

References m_d, and sampleMaxSpeed().

averageSpeed()

qreal KisStrokeSpeedMeasurer::averageSpeed

(

)

const

Definition at line 89 of file KisStrokeSpeedMeasurer.cpp.

{
    if (m_d->samples.isEmpty()) return 0;
 
    const Private::StrokeSample &lastSample = m_d->samples.last();
 
    const int timeDiff = lastSample.time - m_d->startTime;
    if (!timeDiff) return 0;
 
    KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(timeDiff > 0, 0);
 
    return lastSample.distance / timeDiff;
}

References KisStrokeSpeedMeasurer::Private::StrokeSample::distance, KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE, m_d, and KisStrokeSpeedMeasurer::Private::StrokeSample::time.

currentSpeed()

qreal KisStrokeSpeedMeasurer::currentSpeed

(

)

const

Definition at line 125 of file KisStrokeSpeedMeasurer.cpp.

{
    if (m_d->samples.size() <= 1) return 0;
 
    const Private::StrokeSample firstSample = m_d->samples.first();
    const Private::StrokeSample lastSample = m_d->samples.last();
 
    const int timeDiff = lastSample.time - firstSample.time;
    if (!timeDiff) return 0;
 
    KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(timeDiff > 0, 0);
 
    return (lastSample.distance - firstSample.distance) / timeDiff;
}

References KisStrokeSpeedMeasurer::Private::StrokeSample::distance, KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE, m_d, and KisStrokeSpeedMeasurer::Private::StrokeSample::time.

maxSpeed()

qreal KisStrokeSpeedMeasurer::maxSpeed

(

)

const

Definition at line 140 of file KisStrokeSpeedMeasurer.cpp.

{
    return m_d->maxSpeed;
}

References m_d.

reset()

void KisStrokeSpeedMeasurer::reset

(

)

Definition at line 145 of file KisStrokeSpeedMeasurer.cpp.

{
    m_d->samples.clear();
    m_d->lastSamplePos = QPointF();
    m_d->startTime = 0;
    m_d->maxSpeed = 0;
}

References m_d.

sampleMaxSpeed()

void KisStrokeSpeedMeasurer::sampleMaxSpeed ( )

private

Definition at line 153 of file KisStrokeSpeedMeasurer.cpp.

{
    if (m_d->samples.size() <= 1) return;
 
    const Private::StrokeSample firstSample = m_d->samples.first();
    const Private::StrokeSample lastSample = m_d->samples.last();
 
    const int timeDiff = lastSample.time - firstSample.time;
    if (timeDiff < m_d->timeSmoothWindow) return;
 
    const qreal speed = currentSpeed();
    if (speed > m_d->maxSpeed) {
        m_d->maxSpeed = speed;
    }
}

References currentSpeed(), m_d, and KisStrokeSpeedMeasurer::Private::StrokeSample::time.

Member Data Documentation

m_d

const QScopedPointer<Private> KisStrokeSpeedMeasurer::m_d

private

Definition at line 38 of file KisStrokeSpeedMeasurer.h.

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

• libs/image/brushengine/KisStrokeSpeedMeasurer.h
• libs/image/brushengine/KisStrokeSpeedMeasurer.cpp