Question

我正在尝试一些事情。我已经完成了本教程：https://www.makegameswith.us/tutorials/getting-started-with-spritebuilder/ 但是我现在有点卡住了。我在SpriteBuilder中创建了一个CCNode并添加了3个图像。 carbody.png和2 wheel.png。我创建了所有对象physicsObjects。

在代码中，我尝试将它们与关节连接起来并移动它们。然而，汽车车身移动但车轮仍然保持原位。

#import "Car.h"

@implementation Skater{
CCNode *_wheel1;
CCNode *_wheel2;
CCNode *_carBody;
CCPhysicsJoint *_bodyWheelJoint1;
CCPhysicsJoint *_bodyWheelJoint2;


}
- (id)init {
    self = [super init];

if (self) {
    [_wheel1.physicsBody setCollisionGroup: _carBody];
    [_wheel2.physicsBody setCollisionGroup: _carBody;
    [_carBody.physicsBody setCollisionGroup: _carBody];

    _bodyWheelJoint1 = [CCPhysicsJoint connectedPivotJointWithBodyA:_wheel1.physicsBody bodyB: _carBody.physicsBody anchorA:_wheel1.anchorPointInPoints];
    _bodyWheelJoint2 = [CCPhysicsJoint connectedPivotJointWithBodyA:_wheel2.physicsBody bodyB: _carBody.physicsBody anchorA:_wheel2.anchorPointInPoints];


}
return self;
}

在Gameplay.m中我只做了这个：

-(void)didLoadFromCCB{
[_car runAction:
 [CCActionMoveTo actionWithDuration:10 position:CGPointMake(2000,_car.position.y)]];

}

carBody移动，车轮没有......

我错过了什么？

编辑：我现在做了一些改动，但我的轮子仍然留在他们的位置......

#import "Car.h"

@implementation Car{
CCNode *_wheel1;
CCNode *_wheel2;
CCNode *_carBody;
CCPhysicsJoint *_bodyWheelJoint1;
CCPhysicsJoint *_bodyWheelJoint2;
}
- (id)init {

    self = [super init];
if (self) {
    CCLOG(@"Car created");
    [_wheel1.physicsBody setCollisionGroup:_carBody];
    [_wheel2.physicsBody setCollisionGroup:_carBody];
    [_carBody.physicsBody setCollisionGroup:_carBody];

    _bodyWheelJoint1 = [CCPhysicsJoint connectedPivotJointWithBodyA:_wheel1.physicsBody bodyB:_carBody.physicsBody anchorA:_wheel1.anchorPointInPoints];
    _bodyWheelJoint2 = [CCPhysicsJoint connectedPivotJointWithBodyA:_wheel2.physicsBody bodyB:_carBody.physicsBody anchorA:_wheel2.anchorPointInPoints];

}
return self;
}
-(void)moveCar:(int)distance{
CCLOG(@"Car should move");
CGPoint launchDirection = ccp(1, 0);
CGPoint force = ccpMult(launchDirection, distance);
[self.physicsBody applyForce:force];
}
@end

Answer 1

你只是错过了移动（和其他）动作绕过物理的观点。一旦一个节点有一个物理体，使用改变位置和旋转的CCAction *类就是禁忌，大多数其他（即比例）也不会应用于物理体，但仍然可以安全使用。

要移动物理对象，请向物理主体施加冲动或力。

Cocos2D SpriteBuilder带轮子的简单车

1 个答案: