屏幕两侧有两只手完全不动,两只手拇指旋转360度。我想限制拇指旋转,这意味着我只需要它们就像普通拇指一样旋转。我是cocos2d的新手,所以任何帮助都将不胜感激。这是我到目前为止所拥有的
#import "cocos2d.h"
@interface GameScene : CCLayer {
CGFloat lthumbRotation, rthumbRotation;
CCSprite *lthumb, *rthumb;
}
+(CCScene *) scene;
@end
------------------------------------
#import "GameScene.h"
@implementation GameScene
+(CCScene *) scene
{
CCScene *scene = [CCScene node];
GameScene *layer = [GameScene node];
[scene addChild: layer];
return scene;
}
-(id) init
{
if ((self = [super init]))
{
lthumb = [CCSprite spriteWithFile:@"lthumb.png" rect:CGRectMake(0,0, 145, 59)];
lthumb.position = ccp(100, 140);
lthumb.anchorPoint = ccp(0.3, 0.8);
[self addChild:lthumb z:0];
rthumb = [CCSprite spriteWithFile:@"rthumb.png" rect:CGRectMake(0,0, 145, 59)];
rthumb.position = ccp(380, 140);
rthumb.anchorPoint = ccp(0.7, 0.8);
[self addChild:rthumb z:0];
[self scheduleUpdate];
}
return self;
}
-(void)update:(ccTime)delta
{
lthumb.rotation = lthumbRotation;
rthumb.rotation = rthumbRotation;
}
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
//acquire the previous touch location
CGPoint firstLocation = [touch previousLocationInView:[touch view]];
CGPoint location = [touch locationInView:[touch view]];
//preform all the same basic rig on both the current touch and previous touch
CGPoint touchingPoint = [[CCDirector sharedDirector] convertToGL:location];
CGPoint firstTouchingPoint = [[CCDirector sharedDirector] convertToGL:firstLocation];
CGPoint firstVector = ccpSub(firstTouchingPoint, rthumb.position);
CGFloat firstRotateAngle = -ccpToAngle(firstVector);
CGFloat previousTouch = CC_RADIANS_TO_DEGREES(firstRotateAngle);
CGPoint vector = ccpSub(touchingPoint, rthumb.position);
CGFloat rotateAngle = -ccpToAngle(vector);
CGFloat currentTouch = CC_RADIANS_TO_DEGREES(rotateAngle);
//keep adding the difference of the two angles to the dial rotation
lthumbRotation += currentTouch - previousTouch;
rthumbRotation -= currentTouch - previousTouch;
}
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void) dealloc
{
CCLOG(@"%@: %@", NSStringFromSelector(_cmd), self);
[super dealloc];
}
@end
这使得两个拇指同时以向上/向下的角度移动,其中锚点位于拇指的底部(像关节一样)。
一旦触摸结束,我还需要拇指旋转才能重置为0.
提前致谢
答案 0 :(得分:1)
在ccTouchesMoved:withEvent:
方法中,只需检查新轮换是否在给定的阈值内,然后再将其应用于精灵。
最后,在ccTouchesEnded:withEvent:
中,您只需将旋转值设置回0:
lthumbRotation = 0;
rthumbRotation = 0;