旋转雪碧与触摸 - Cocos2d [英] Rotating Sprite with Touch - Cocos2d

问题描述

有没有人有更好的方法用一个手指旋转sprite？我的问题是，我不能得到精灵停止旋转后，完全旋转两次，我翻转我的屏幕180度周期（self.rotation = 180;）然后翻转（self.rotation = 0）。

Does anyone have a better way to rotate a sprite with one finger? My problem is that I can not get the sprite to stop rotating after it has been fully rotated twice and I flip my screen 180 degree periodcally (self.rotation = 180;) then flip it back (self.rotation = 0). But, when I flip it to 180 degrees the sprite will not rotate properly.

任何人都有比这更好的想法吗？

Any one have any better ideas than this?

CGFloat gRotation;

- (void)update:(ccTime)delta
{
    g.rotation = gRotation;
}
    - (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {
        UITouch *touch = [touches anyObject];
        CGPoint location = [touch locationInView:[touch view]];
        location = [[CCDirector sharedDirector] convertToGL:location];

        if (CGRectContainsPoint(g.boundingBox, location))
        {
            CGPoint firstLocation = [touch previousLocationInView:[touch view]];
            CGPoint location = [touch locationInView:[touch view]];

            CGPoint touchingPoint = [[CCDirector sharedDirector] convertToGL:location];
            CGPoint firstTouchingPoint = [[CCDirector sharedDirector] convertToGL:firstLocation];

            CGPoint firstVector = ccpSub(firstTouchingPoint, g.position);
            CGFloat firstRotateAngle = -ccpToAngle(firstVector);
            CGFloat previousTouch = CC_RADIANS_TO_DEGREES(firstRotateAngle);

            CGPoint vector = ccpSub(touchingPoint, g.position);
            CGFloat rotateAngle = -ccpToAngle(vector);
            CGFloat currentTouch = CC_RADIANS_TO_DEGREES(rotateAngle);

            gRotation += currentTouch - previousTouch;
        }
    }

感谢

编辑：

我进入GameConfig.h并更改了 #define GAME_AUTOROTATION kGameAutorotationUIViewController 到 #define GAME_AUTOROTATION kGameAutorotationNone

I went in to GameConfig.h and changed #define GAME_AUTOROTATION kGameAutorotationUIViewController to #define GAME_AUTOROTATION kGameAutorotationNone

然后，进入AppDelegate.m并更改 #if GAME_AUTOROTATION == kGameAutorotationUIViewController 至 #if GAME_AUTOROTATION == kGameAutorotationNone

Then, went in to AppDelegate.m and changed #if GAME_AUTOROTATION == kGameAutorotationUIViewController to #if GAME_AUTOROTATION == kGameAutorotationNone

当我翻转屏幕时固定精灵的旋转，但是我仍然有问题，在两个完整旋转后停止精灵的旋转。

That fixed the sprite's rotation when I flipped the screen, but I am still having problems stopping the sprite's rotation after two full rotations.

推荐答案

在结尾添加一行：

gRotation += currentTouch - previousTouch;
gRotation = fmod(gRotation,360.0); // <<< fix the angle

这可能解决了你的问题，因为角度会保持在360°范围

this maybe fix your problem, because the angle will stay in the 360 range

用一个手指旋转的其他方法是UIPanGestureRecognizer（但是你仍然需要保持角度在360范围内）：

Other way to rotate with one finger is the UIPanGestureRecognizer (but you still need to keep the angle in the 360 range):

UIPanGestureRecognizer *gestureRecognizer = [[[UIPanGestureRecognizer alloc] initWithTarget:layer action:@selector(handlePanFrom:)] autorelease];
[[[CCDirector sharedDirector] openGLView] addGestureRecognizer:gestureRecognizer];

...

- (void)handlePanFrom:(UIPanGestureRecognizer *)recognizer 
{
  CGPoint translation = [recognizer translationInView:recognizer.view];
  ...
}

查看本教程了解更多详情（它的拖动，但显示如何做平移手势）：

Take a look at this tutorial for more details (its on drag, but show how to do the pan gesture):

http://www.raywenderlich.com/2343/how-to-drag-and-drop-sprites-with-cocos2d

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