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qquickfriction.cpp

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1 /**************************************************************************** -

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4 ** Contact: https://www.qt.io/licensing/ -

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6 ** This file is part of the QtQuick module of the Qt Toolkit. -

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38 ****************************************************************************/ -

39 -

40 #include "qquickfriction_p.h" -

41 #include <qmath.h> -

42 -

43 QT_BEGIN_NAMESPACE -

44 /*! -

45 \qmltype Friction -

46 \instantiates QQuickFrictionAffector -

47 \inqmlmodule QtQuick.Particles -

48 \ingroup qtquick-particles -

49 \inherits Affector -

50 \brief For applying friction proportional to the particle's current velocity. -

51 -

52 */ -

53 -

54 /*! -

55 \qmlproperty real QtQuick.Particles::Friction::factor -

56 -

57 A drag will be applied to moving objects which is this factor of their current velocity. -

58 */ -

59 /*! -

60 \qmlproperty real QtQuick.Particles::Friction::threshold -

61 -

62 The drag will only be applied to objects with a velocity above the threshold velocity. The -

63 drag applied will bring objects down to the threshold velocity, but no further. -

64 -

65 The default threshold is 0 -

66 */ -

67 static qreal sign(qreal a) -

68 { -

return a >= 0 ? 1 : -1;

executed 98808 times by 1 test: return a >= 0 ? 1 : -1;

Executed by:

tst_qquickfriction

98808

70 } -

71 -

72 static const qreal epsilon = 0.00001; -

73 -

74 QQuickFrictionAffector::QQuickFrictionAffector(QQuickItem *parent) : -

75 QQuickParticleAffector(parent), m_factor(0.0), m_threshold(0.0) -

76 { -

}

executed 10 times by 2 tests: end of block

Executed by:

tst_examples
tst_qquickfriction

78 -

79 bool QQuickFrictionAffector::affectParticle(QQuickParticleData *d, qreal dt) -

80 { -

if (!m_factor)

!m_factor	Description
TRUE	never evaluated
FALSE	evaluated 93378 times by 1 test Evaluated by: tst_qquickfriction

0-93378

return false;

never executed: return false;

83 qreal curVX = d->curVX(m_system); -

84 qreal curVY = d->curVY(m_system); -

if (!curVX && !curVY)

!curVX	Description
TRUE	evaluated 44476 times by 1 test Evaluated by: tst_qquickfriction
FALSE	evaluated 48902 times by 1 test Evaluated by: tst_qquickfriction

!curVY	Description
TRUE	evaluated 44476 times by 1 test Evaluated by: tst_qquickfriction
FALSE	never evaluated

0-48902

return false;

executed 44476 times by 1 test: return false;

Executed by:

tst_qquickfriction

44476

87 qreal newVX = curVX + (curVX * m_factor * -1 * dt); -

88 qreal newVY = curVY + (curVY * m_factor * -1 * dt); -

89 -

if (!m_threshold) {

!m_threshold	Description
TRUE	evaluated 24062 times by 1 test Evaluated by: tst_qquickfriction
FALSE	evaluated 24840 times by 1 test Evaluated by: tst_qquickfriction

24062-24840

if (sign(curVX) != sign(newVX))

sign(curVX) != sign(newVX)	Description
TRUE	evaluated 1216 times by 1 test Evaluated by: tst_qquickfriction
FALSE	evaluated 22846 times by 1 test Evaluated by: tst_qquickfriction

1216-22846

newVX = 0;

executed 1216 times by 1 test: newVX = 0;

Executed by:

tst_qquickfriction

1216

if (sign(curVY) != sign(newVY))

sign(curVY) != sign(newVY)	Description
TRUE	never evaluated
FALSE	evaluated 24062 times by 1 test Evaluated by: tst_qquickfriction

0-24062

newVY = 0;

never executed: newVY = 0;

} else {

executed 24062 times by 1 test: end of block

Executed by:

tst_qquickfriction

24062

96 qreal curMag = qSqrt(curVX*curVX + curVY*curVY); -

if (curMag <= m_threshold + epsilon)

curMag <= m_th...hold + epsilon	Description
TRUE	evaluated 23560 times by 1 test Evaluated by: tst_qquickfriction
FALSE	evaluated 1280 times by 1 test Evaluated by: tst_qquickfriction

1280-23560

return false;

executed 23560 times by 1 test: return false;

Executed by:

tst_qquickfriction

23560

99 qreal newMag = qSqrt(newVX*newVX + newVY*newVY); -

100

if (newMag <= m_threshold + epsilon || //went past the threshold, stop there instead

newMag <= m_th...hold + epsilon	Description
TRUE	never evaluated
FALSE	evaluated 1280 times by 1 test Evaluated by: tst_qquickfriction

0-1280

101

sign(curVX) != sign(newVX) || //went so far past maybe it came out the other side!

sign(curVX) != sign(newVX)	Description
TRUE	evaluated 1280 times by 1 test Evaluated by: tst_qquickfriction
FALSE	never evaluated

0-1280

102

sign(curVY) != sign(newVY)) {

sign(curVY) != sign(newVY)	Description
TRUE	never evaluated
FALSE	never evaluated

103 qreal theta = qAtan2(curVY, curVX); -

104 newVX = m_threshold * qCos(theta); -

105 newVY = m_threshold * qSin(theta); -

106

}

executed 1280 times by 1 test: end of block

Executed by:

tst_qquickfriction

1280

107

}

executed 1280 times by 1 test: end of block

Executed by:

tst_qquickfriction

1280

108 -

109 d->setInstantaneousVX(newVX, m_system); -

110 d->setInstantaneousVY(newVY, m_system); -

111

return true;

executed 25342 times by 1 test: return true;

Executed by:

tst_qquickfriction

25342

112 } -

113 QT_END_NAMESPACE -

114 -

115 #include "moc_qquickfriction_p.cpp" -

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