File indexing completed on 2024-04-14 14:08:25
0001 /* 0002 * box2dweldjoint.cpp 0003 * Copyright (c) 2011 Joonas Erkinheimo <joonas.erkinheimo@nokia.com> 0004 * 0005 * This file is part of the Box2D QML plugin. 0006 * 0007 * This software is provided 'as-is', without any express or implied warranty. 0008 * In no event will the authors be held liable for any damages arising from 0009 * the use of this software. 0010 * 0011 * Permission is granted to anyone to use this software for any purpose, 0012 * including commercial applications, and to alter it and redistribute it 0013 * freely, subject to the following restrictions: 0014 * 0015 * 1. The origin of this software must not be misrepresented; you must not 0016 * claim that you wrote the original software. If you use this software in 0017 * a product, an acknowledgment in the product documentation would be 0018 * appreciated but is not required. 0019 * 0020 * 2. Altered source versions must be plainly marked as such, and must not be 0021 * misrepresented as being the original software. 0022 * 0023 * 3. This notice may not be removed or altered from any source distribution. 0024 */ 0025 0026 #include "box2dweldjoint.h" 0027 0028 #include "box2dworld.h" 0029 #include "box2dbody.h" 0030 0031 Box2DWeldJoint::Box2DWeldJoint(QObject *parent) 0032 : Box2DJoint(WeldJoint, parent) 0033 , m_referenceAngle(0.0f) 0034 , m_frequencyHz(0.0f) 0035 , m_dampingRatio(0.0f) 0036 , m_defaultLocalAnchorA(true) 0037 , m_defaultLocalAnchorB(true) 0038 , m_defaultReferenceAngle(true) 0039 { 0040 } 0041 0042 void Box2DWeldJoint::setLocalAnchorA(const QPointF &localAnchorA) 0043 { 0044 m_defaultLocalAnchorA = false; 0045 0046 if (m_localAnchorA == localAnchorA) 0047 return; 0048 0049 m_localAnchorA = localAnchorA; 0050 emit localAnchorAChanged(); 0051 } 0052 0053 void Box2DWeldJoint::setLocalAnchorB(const QPointF &localAnchorB) 0054 { 0055 m_defaultLocalAnchorB = false; 0056 0057 if (m_localAnchorB == localAnchorB) 0058 return; 0059 0060 m_localAnchorB = localAnchorB; 0061 emit localAnchorBChanged(); 0062 } 0063 0064 void Box2DWeldJoint::setReferenceAngle(float referenceAngle) 0065 { 0066 m_defaultReferenceAngle = false; 0067 0068 if (m_referenceAngle == referenceAngle) 0069 return; 0070 0071 m_referenceAngle = referenceAngle; 0072 emit referenceAngleChanged(); 0073 } 0074 0075 void Box2DWeldJoint::setFrequencyHz(float frequencyHz) 0076 { 0077 if (m_frequencyHz == frequencyHz) 0078 return; 0079 0080 m_frequencyHz = frequencyHz; 0081 if (weldJoint()) 0082 weldJoint()->SetFrequency(frequencyHz); 0083 emit frequencyHzChanged(); 0084 } 0085 0086 void Box2DWeldJoint::setDampingRatio(float dampingRatio) 0087 { 0088 if (m_dampingRatio == dampingRatio) 0089 return; 0090 0091 m_dampingRatio = dampingRatio; 0092 if (weldJoint()) 0093 weldJoint()->SetDampingRatio(dampingRatio); 0094 emit dampingRatioChanged(); 0095 } 0096 0097 b2Joint *Box2DWeldJoint::createJoint() 0098 { 0099 b2WeldJointDef jointDef; 0100 initializeJointDef(jointDef); 0101 0102 // Default localAnchorA to bodyA center 0103 if (m_defaultLocalAnchorA) 0104 jointDef.localAnchorA = jointDef.bodyA->GetLocalCenter(); 0105 else 0106 jointDef.localAnchorA = world()->toMeters(m_localAnchorA); 0107 0108 // Default localAnchorB to the same world position as localAnchorA 0109 if (m_defaultLocalAnchorB) { 0110 b2Vec2 anchorA = jointDef.bodyA->GetWorldPoint(jointDef.localAnchorA); 0111 jointDef.localAnchorB = jointDef.bodyB->GetLocalPoint(anchorA); 0112 } else { 0113 jointDef.localAnchorB = world()->toMeters(m_localAnchorB); 0114 } 0115 0116 if (m_defaultReferenceAngle) { 0117 float32 angleA = jointDef.bodyA->GetAngle(); 0118 float32 angleB = jointDef.bodyB->GetAngle(); 0119 jointDef.referenceAngle = angleB - angleA; 0120 } else { 0121 jointDef.referenceAngle = toRadians(m_referenceAngle); 0122 } 0123 0124 jointDef.frequencyHz = m_frequencyHz; 0125 jointDef.dampingRatio = m_dampingRatio; 0126 0127 return world()->world().CreateJoint(&jointDef); 0128 }