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qquickpointattractor.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 "qquickpointattractor_p.h" -

41 #include <cmath> -

42 #include <QDebug> -

43 QT_BEGIN_NAMESPACE -

44 /*! -

45 \qmltype Attractor -

46 \instantiates QQuickAttractorAffector -

47 \inqmlmodule QtQuick.Particles -

48 \ingroup qtquick-particles -

49 \inherits Affector -

50 \brief For attracting particles towards a specific point. -

51 -

52 Note that the size and position of this element affects which particles it affects. -

53 The size of the point attracted to is always 0x0, and the location of that point -

54 is specified by the pointX and pointY properties. -

55 -

56 Note that Attractor has the standard Item x,y,width and height properties. -

57 Like other affectors, these represent the affected area. They -

58 do not represent the 0x0 point which is the target of the attraction. -

59 */ -

60 -

61 -

62 /*! -

63 \qmlproperty real QtQuick.Particles::PointAttractor::pointX -

64 -

65 The x coordinate of the attracting point. This is relative -

66 to the x coordinate of the Attractor. -

67 */ -

68 /*! -

69 \qmlproperty real QtQuick.Particles::PointAttractor::pointY -

70 -

71 The y coordinate of the attracting point. This is relative -

72 to the y coordinate of the Attractor. -

73 */ -

74 /*! -

75 \qmlproperty real QtQuick.Particles::PointAttractor::strength -

76 -

77 The pull, in units per second, to be exerted on an item one pixel away. -

78 -

79 Depending on how the attraction is proportionalToDistance this may have to -

80 be very high or very low to have a reasonable effect on particles at a -

81 distance. -

82 */ -

83 /*! -

84 \qmlproperty AffectableParameter QtQuick.Particles::Attractor::affectedParameter -

85 -

86 What attribute of particles is directly affected. -

87 \list -

88 \li Attractor.Position -

89 \li Attractor.Velocity -

90 \li Attractor.Acceleration -

91 \endlist -

92 */ -

93 /*! -

94 \qmlproperty Proportion QtQuick.Particles::Attractor::proportionalToDistance -

95 -

96 How the distance from the particle to the point affects the strength of the attraction. -

97 -

98 \list -

99 \li Attractor.Constant -

100 \li Attractor.Linear -

101 \li Attractor.InverseLinear -

102 \li Attractor.Quadratic -

103 \li Attractor.InverseQuadratic -

104 \endlist -

105 */ -

106 -

107 -

108 QQuickAttractorAffector::QQuickAttractorAffector(QQuickItem *parent) : -

109 QQuickParticleAffector(parent), m_strength(0.0), m_x(0), m_y(0) -

110 , m_physics(Velocity), m_proportionalToDistance(Linear) -

111 { -

112

}

executed 4 times by 2 tests: end of block

Executed by:

tst_examples
tst_qquickpointattractor

113 -

114 bool QQuickAttractorAffector::affectParticle(QQuickParticleData *d, qreal dt) -

115 { -

116

if (m_strength == 0.0)

m_strength == 0.0	Description
TRUE	never evaluated
FALSE	evaluated 22846 times by 1 test Evaluated by: tst_qquickpointattractor

0-22846

117

return false;

never executed: return false;

118 qreal dx = m_x+m_offset.x() - d->curX(m_system); -

119 qreal dy = m_y+m_offset.y() - d->curY(m_system); -

120 qreal r = std::sqrt((dx*dx) + (dy*dy)); -

121 qreal theta = std::atan2(dy,dx); -

122 qreal ds = 0; -

123 switch (m_proportionalToDistance){ -

124

case InverseQuadratic:

never executed: case InverseQuadratic:

125 ds = (m_strength / qMax<qreal>(1.,r*r)); -

126

break;

never executed: break;

127

case InverseLinear:

never executed: case InverseLinear:

128 ds = (m_strength / qMax<qreal>(1.,r)); -

129

break;

never executed: break;

130

case Quadratic:

never executed: case Quadratic:

131 ds = (m_strength * qMax<qreal>(1.,r*r)); -

132

break;

never executed: break;

133

case Linear:

never executed: case Linear:

134 ds = (m_strength * qMax<qreal>(1.,r)); -

135

break;

never executed: break;

136

default: //also Constant

executed 22846 times by 1 test: default:

Executed by:

tst_qquickpointattractor

22846

137 ds = m_strength; -

138

}

executed 22846 times by 1 test: end of block

Executed by:

tst_qquickpointattractor

22846

139 ds *= dt; -

140 dx = ds * std::cos(theta); -

141 dy = ds * std::sin(theta); -

142 qreal vx,vy; -

143 switch (m_physics){ -

144

case Position:

executed 22846 times by 1 test: case Position:

Executed by:

tst_qquickpointattractor

22846

145 d->x = (d->x + dx); -

146 d->y = (d->y + dy); -

147

break;

executed 22846 times by 1 test: break;

Executed by:

tst_qquickpointattractor

22846

148

case Acceleration:

never executed: case Acceleration:

149 d->setInstantaneousAX(d->ax + dx, m_system); -

150 d->setInstantaneousAY(d->ay + dy, m_system); -

151

break;

never executed: break;

152

case Velocity: //also default

never executed: case Velocity:

153

default:

never executed: default:

154 vx = d->curVX(m_system); -

155 vy = d->curVY(m_system); -

156 d->setInstantaneousVX(vx + dx, m_system); -

157 d->setInstantaneousVY(vy + dy, m_system); -

158

}

never executed: end of block

159 -

160

return true;

executed 22846 times by 1 test: return true;

Executed by:

tst_qquickpointattractor

22846

161 } -

162 QT_END_NAMESPACE -

163 -

164 #include "moc_qquickpointattractor_p.cpp" -

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