Ios Cocos2d V3（花栗鼠）中具有摩擦和极限的枢轴接头

我尝试将一个我从SpriteKit开始的游戏转换为Cocos2d V3。不过我在物理方面有些问题。我创造了一个像人类一样的玩偶。在SpriteKit中，四肢通过小关节连接。我通过花栗鼠的枢轴关节重新创建了这个基本功能。这是意料之中的事

但我需要给关节增加一些摩擦力。现在他们只是尽可能快地旋转，更重要的是我需要限制关节的旋转角度。你可以想象，大多数人不能360度自由旋转肩膀

好吧，我应该用花栗鼠关节和花栗鼠关节来达到这个目的。我的问题是，我无法让它工作，因为我不知道如何正确地连接它们。这是我现在的代码：

- (CCPhysicsJoint *)createPinJointWithBodyA:(CCPhysicsBody *)bodyA
                                      bodyB:(CCPhysicsBody *)bodyB
                                     anchor:(CGPoint)anchor
                                   friction:(CGFloat)friction
                                 lowerLimit:(CGFloat)lowerLimit
                                 upperLimit:(CGFloat)upperLimit
{

    CCPhysicsJoint *pin = [CCPhysicsJoint 
        connectedPivotJointWithBodyA:bodyA
                               bodyB:bodyB
                             anchorA:anchor];

    ChipmunkRotaryLimitJoint *limitJoint = [ChipmunkRotaryLimitJoint 
        rotaryLimitJointWithBodyA:bodyA.body 
                            bodyB:bodyB.body
                              min:CC_DEGREES_TO_RADIANS(lowerLimit)
                              max:CC_DEGREES_TO_RADIANS(upperLimit)];

    ChipmunkGearJoint *gearJoint = [ChipmunkGearJoint 
        gearJointWithBodyA:bodyA.body
                     bodyB:bodyB.body
                     phase:0.5
                     ratio:0.5];

    return pin;
}

[CCPhysicsJoint connectedRotaryLimitJointWithBodyA:bodyA
                                             bodyB:bodyB
                                               min:CC_DEGREES_TO_RADIANS(lowerLimit)
                                               max:CC_DEGREES_TO_RADIANS(upperLimit)];

[CCPhysicsJoint connectedDampedRotarySpringWithBodyA:bodyA
                                               bodyB:bodyB
                                           restAngle:0
                                           stiffness:friction *1000.0f
                                             damping:10000.0f];

（gearJoint调用中的值只是占位符！）

有人知道这是怎么回事吗？我通过谷歌找到了一些东西，但所有教程都假设我在其他环境中使用了花栗鼠。我是否必须为这些极限和齿轮联接创建自己的联合实施

谢谢并致以最良好的祝愿，

---

托马斯我想我解决了这个问题。事实证明，我必须创建自己的CCPhysisJoint类别，实现ChipmunkRotaryLimitJoint和ChipmunkRotaryDampedSpring。虽然不完全一样，但现在已经足够好了

现在代码如下所示：

- (CCPhysicsJoint *)createPinJointWithBodyA:(CCPhysicsBody *)bodyA
                                      bodyB:(CCPhysicsBody *)bodyB
                                     anchor:(CGPoint)anchor
                                   friction:(CGFloat)friction
                                 lowerLimit:(CGFloat)lowerLimit
                                 upperLimit:(CGFloat)upperLimit
{

    CCPhysicsJoint *pin = [CCPhysicsJoint 
        connectedPivotJointWithBodyA:bodyA
                               bodyB:bodyB
                             anchorA:anchor];

    ChipmunkRotaryLimitJoint *limitJoint = [ChipmunkRotaryLimitJoint 
        rotaryLimitJointWithBodyA:bodyA.body 
                            bodyB:bodyB.body
                              min:CC_DEGREES_TO_RADIANS(lowerLimit)
                              max:CC_DEGREES_TO_RADIANS(upperLimit)];

    ChipmunkGearJoint *gearJoint = [ChipmunkGearJoint 
        gearJointWithBodyA:bodyA.body
                     bodyB:bodyB.body
                     phase:0.5
                     ratio:0.5];

    return pin;
}

[CCPhysicsJoint connectedRotaryLimitJointWithBodyA:bodyA
                                             bodyB:bodyB
                                               min:CC_DEGREES_TO_RADIANS(lowerLimit)
                                               max:CC_DEGREES_TO_RADIANS(upperLimit)];

[CCPhysicsJoint connectedDampedRotarySpringWithBodyA:bodyA
                                               bodyB:bodyB
                                           restAngle:0
                                           stiffness:friction *1000.0f
                                             damping:10000.0f];

我只是问这是否应该包括在Cocos2D代码库中。目前，这是包装器：

ccphysisjoint+thcaditions.h

//
//  CCPhysicsJoint+THCAdditions.h
//
//  Created by Thomas Hempel on 02.02.14.
//  Copyright (c) 2014 Thomas Hempel. All rights reserved.
//

#import "CCPhysicsBody.h"
#import "CCPhysicsJoint.h"

@interface CCPhysicsJoint (THCAdditions)

+ (CCPhysicsJoint *)connectedRotaryLimitJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB min:(CGFloat)min max:(CGFloat)max;
+ (CCPhysicsJoint *)connectedGearJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB phase:(CGFloat)phase ratio:(CGFloat)ratio;
+ (CCPhysicsJoint *)connectedSimpleMotorJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB rate:(CGFloat)rate;
+ (CCPhysicsJoint *)connectedDampedRotarySpringWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB restAngle:(CGFloat)restAngle stiffness:(CGFloat)stiffness damping:(CGFloat)damping;

@end

ccphysisjoint+thcaditions.m

//
//  CCPhysicsJoint+THCAdditions.m
//
//  Created by Thomas Hempel on 02.02.14.
//  Copyright (c) 2014 Thomas Hempel. All rights reserved.
//

#import "CCPhysicsJoint+THCAdditions.h"
#import "CCPhysics+ObjectiveChipmunk.h"

// ------------------------------------------------------------------------
#pragma mark - Rotary Limit Joint
// ------------------------------------------------------------------------

@interface CCPhysicsRotaryLimitJoint : CCPhysicsJoint
@end

@implementation CCPhysicsRotaryLimitJoint {
    ChipmunkRotaryLimitJoint *_constraint;
}

- (id)initWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB min:(CGFloat)min max:(CGFloat)max
{
    if ((self = [super init])){
        _constraint = [ChipmunkRotaryLimitJoint rotaryLimitJointWithBodyA:bodyA.body
                                                                    bodyB:bodyB.body
                                                                      min:min
                                                                      max:max];
        _constraint.userData = self;
    }
    return self;
}

- (ChipmunkConstraint *)constraint
{
    return _constraint;
}

- (void)willAddToPhysicsNode:(CCPhysicsNode *)physics
{
}

@end

// ------------------------------------------------------------------------
#pragma mark - Gear Joint
// ------------------------------------------------------------------------

@interface CCPhysicsGearJoint : CCPhysicsJoint
@end

@implementation CCPhysicsGearJoint {
    ChipmunkGearJoint *_constraint;
}

- (id)initWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB phase:(CGFloat)phase ratio:(CGFloat)ratio
{
    if ((self = [super init])){
        _constraint = [ChipmunkGearJoint gearJointWithBodyA:bodyA.body
                                                      bodyB:bodyB.body
                                                      phase:phase
                                                      ratio:ratio];
        _constraint.userData = self;
    }

    return self;
}

- (ChipmunkConstraint *)constraint
{
    return _constraint;
}

- (void)willAddToPhysicsNode:(CCPhysicsNode *)physics
{
}

@end

// ------------------------------------------------------------------------
#pragma mark - Simple Motor Joint
// ------------------------------------------------------------------------

@interface CCPhysicsSimpleMotorJoint : CCPhysicsJoint
@end

@implementation CCPhysicsSimpleMotorJoint {
    ChipmunkSimpleMotor *_constraint;
}

- (id)initWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB rate:(CGFloat)rate
{
    if ((self = [super init])){
        _constraint = [ChipmunkSimpleMotor simpleMotorWithBodyA:bodyA.body
                                                          bodyB:bodyB.body
                                                           rate:rate];
        _constraint.userData = self;
    }

    return self;
}

- (ChipmunkConstraint *)constraint
{
    return _constraint;
}

- (void)willAddToPhysicsNode:(CCPhysicsNode *)physics
{
}

@end

// ------------------------------------------------------------------------
#pragma mark - Damped Rotary Spring
// ------------------------------------------------------------------------

@interface CCPhysicsDampedRotarySpring : CCPhysicsJoint
@end

@implementation CCPhysicsDampedRotarySpring {
    ChipmunkDampedRotarySpring *_constraint;
}

- (id)initWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB restAngle:    (CGFloat)restAngle stiffness:(CGFloat)stiffness damping:(CGFloat)damping
{
    if ((self = [super init])){
        _constraint = [ChipmunkDampedRotarySpring dampedRotarySpringWithBodyA:bodyA.body
                                                                        bodyB:bodyB.body
                                                                    restAngle:restAngle
                                                                    stiffness:stiffness
                                                                      damping:damping];
        _constraint.userData = self;
    }

    return self;
}

- (ChipmunkConstraint *)constraint
{
    return _constraint;
}

- (void)willAddToPhysicsNode:(CCPhysicsNode *)physics
{
}

@end

// ------------------------------------------------------------------------
#pragma mark - Implementation
// ------------------------------------------------------------------------


@implementation CCPhysicsJoint (THCAdditions)

+ (CCPhysicsJoint *)connectedRotaryLimitJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB min:(CGFloat)min max:(CGFloat)max
{

    CCPhysicsJoint *joint = [[CCPhysicsRotaryLimitJoint alloc] initWithBodyA:bodyA bodyB:bodyB min:min max:max];
    [bodyA addJoint:joint];
    [bodyB addJoint:joint];

    [bodyA.physicsNode.space smartAdd:joint];

    return joint;
}

+ (CCPhysicsJoint *)connectedGearJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB phase:(CGFloat)phase ratio:(CGFloat)ratio
{
    CCPhysicsJoint *joint = [[CCPhysicsGearJoint alloc] initWithBodyA:bodyA bodyB:bodyB phase:phase ratio:ratio];

    [bodyA addJoint:joint];
    [bodyB addJoint:joint];

    [bodyA.physicsNode.space smartAdd:joint];

    return joint;
}

+ (CCPhysicsJoint *)connectedSimpleMotorJointWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB rate:(CGFloat)rate
{
    CCPhysicsJoint *joint = [[CCPhysicsSimpleMotorJoint alloc] initWithBodyA:bodyA bodyB:bodyB rate:rate];

    [bodyA addJoint:joint];
    [bodyB addJoint:joint];

    [bodyA.physicsNode.space smartAdd:joint];

    return joint;
}

+ (CCPhysicsJoint *)connectedDampedRotarySpringWithBodyA:(CCPhysicsBody *)bodyA bodyB:(CCPhysicsBody *)bodyB restAngle:(CGFloat)restAngle stiffness:(CGFloat)stiffness damping:(CGFloat)damping
{
    CCPhysicsJoint *joint = [[CCPhysicsDampedRotarySpring alloc] initWithBodyA:bodyA bodyB:bodyB restAngle:restAngle stiffness:stiffness damping:damping];

    [bodyA addJoint:joint];
    [bodyB addJoint:joint];

    [bodyA.physicsNode.space smartAdd:joint];

    return joint;
}

@end

致以最良好的祝愿， 托马斯