damping
a和frequency
的属性有什么区别SKPhysicsJointSpring
?
我的代码是
var spring = SKPhysicsJointSpring.jointWithBodyA(
body1.physicsBody,
bodyB: body2.physicsBody,
anchorA: body1.position,
anchorB: body2.position)
spring.frequency = 1.8
spring.damping = 0.5
self.physicsWorld.addJoint(spring1)
body1.physicsBody?.dynamic = false
body2.physicsBody?.dynamic = true
应该在什么数值范围内,才能frequency
自然而然damping
地采取spring
行动?