cocos2d-iphone - 如何在 cocos2D 中使用 SpaceManager 使精灵旋转

Question

我只有一个简单的精灵 - 我怎样才能让它旋转？

一个好的答案将显示如何旋转动态精灵和 static_mass 精灵

Answer 1

如果精灵是动态/非静态的，就这样做：

 cpBodySetAngVel(ObjSmSprite.shape->body,0.25); 

对于静态主体，您可以执行以下操作：

[ObjSmStaticSprite.shape runAction:[CCRepeatForever actionWithAction:
                         [CCSequence actions:
                          [CCRotateTo actionWithDuration:2 angle:180],
                          [CCRotateTo actionWithDuration:2 angle:360],
                          nil]

                         ]];


smgr.rehashStaticEveryStep = YES; //Setting this would make the smgr recalculate all static shapes positions every step

总而言之，这是一个旋转的静态精灵，下面是旋转的动态精灵。

  // Add Backboard
    cpShape *shapeRect = [smgr addRectAt:cpvWinCenter mass:STATIC_MASS width:200 height:10 rotation:0.0f ];// We're upgrading this 
  cpCCSprite * cccrsRect = [cpCCSprite spriteWithShape:shapeRect file:@"rect_200x10.png"];
    [self addChild:cccrsRect];

  // Make static object update moves in chipmunk
  // Since Backboard is static, and since we're going to move it, it needs to know about spacemanager so its position gets updated inside chipmunk.
  // Setting this would make the smgr recalculate all static shapes positions every step
//  cccrsRect.integrationDt = smgr.constantDt;
//  cccrsRect.spaceManager = smgr;
  // Alternative method: smgr.rehashStaticEveryStep = YES;
  smgr.rehashStaticEveryStep = YES;

  // Spin the backboard
  [cccrsRect runAction:[CCRepeatForever actionWithAction:
                         [CCSequence actions:
                          [CCRotateTo actionWithDuration:2 angle:180],
                          [CCRotateTo actionWithDuration:2 angle:360],
                          nil]

                         ]];


  // Add the hoop
  cpShape *shapeHoop = [smgr addCircleAt:ccp(winSize.width/2.0f,winSize.height/2.0f - 55.0f) mass:1.0 radius: 50 ];
  cpCCSprite * cccrsHoop = [cpCCSprite spriteWithShape:shapeHoop file:@"hoop_100x100.png"];
    [self addChild:cccrsHoop];
  cpBodySetAngVel(cccrsHoop.shape->body,0.25); 

免责声明：我正在尝试回答我自己的问题，而这个答案可能缺少重要的细节——它只代表了我到目前为止所知道的。

Answer 2

如果使用 cocos2d

在刻度中使用此代码始终更新位置 _number1.position 是您将更新到的位置，因此当 _number1 移动时 _logo2 将旋转以面对它 _logo2.rotation = CC_RADIANS_TO_DEGREES(-ccpToAngle(ccpSub(_number1.position, _logo2.position) ));

通过触摸更新 _logo1 旋转将此代码放在触摸事件处理程序中

_logo2.rotation = CC_RADIANS_TO_DEGREES(-ccpToAngle(ccpSub(location, _logo2.position)));

将此用作操作

[_logo2 runAction:[CCRotateTo actionWithDuration:0.0 angle:CC_RADIANS_TO_DEGREES(-ccpToAngle(ccpSub(location, _logo2.position)))]];

希望这可以帮助有人花了我很长时间才解决这个问题