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Added backwards compatible frequency/dampingRatio functions. Added new stiffness/damping functions.

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Garrett Brown
2020-08-23 02:38:52 -04:00
parent 2d6efd8b8d
commit a16640c89c
14 changed files with 473 additions and 56 deletions
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src/modules/physics/box2d/MouseJoint.cpp
+36 -2
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@@ -78,7 +78,7 @@ float MouseJoint::getMaxForce() const
return Physics::scaleUp(joint->GetMaxForce());
}
void MouseJoint::setStiffness(float hz)
void MouseJoint::setFrequency(float hz)
{
// This is kind of a crappy check. The Stiffness is used in an internal
// box2d calculation whose result must be > FLT_EPSILON, but other variables
@@ -86,7 +86,41 @@ void MouseJoint::setStiffness(float hz)
if (hz <= FLT_EPSILON * 2)
throw love::Exception("MouseJoint Stiffness must be a positive number.");
joint->SetStiffness(hz);
float stiffness, damping;
b2LinearStiffness(stiffness, damping, hz, getDampingRatio(), joint->GetBodyA(), joint->GetBodyB());
joint->SetStiffness(stiffness);
}
float MouseJoint::getFrequency() const
{
float frequency, ratio;
Physics::b2LinearFrequency(frequency, ratio, joint->GetStiffness(), joint->GetDamping(), joint->GetBodyA(), joint->GetBodyB());
return frequency;
}
void MouseJoint::setDampingRatio(float ratio)
{
float stiffness, damping;
b2LinearStiffness(stiffness, damping, getFrequency(), ratio, joint->GetBodyA(), joint->GetBodyB());
joint->SetDamping(damping);
}
float MouseJoint::getDampingRatio() const
{
float frequency, ratio;
Physics::b2LinearFrequency(frequency, ratio, joint->GetStiffness(), joint->GetDamping(), joint->GetBodyA(), joint->GetBodyB());
return ratio;
}
void MouseJoint::setStiffness(float k)
{
// This is kind of a crappy check. The Stiffness is used in an internal
// box2d calculation whose result must be > FLT_EPSILON, but other variables
// go into that calculation...
if (k <= FLT_EPSILON * 2)
throw love::Exception("MouseJoint Stiffness must be a positive number.");
joint->SetStiffness(k);
}
float MouseJoint::getStiffness() const