Iphone 如何在lybrary中旋转和调整类精灵照片的大小

Iphone 如何在lybrary中旋转和调整类精灵照片的大小,iphone,cocos2d-iphone,Iphone,Cocos2d Iphone,我如何在ccTouchesMoved中旋转sprite在cocos2d中的中心。我找到了一些代码,但这不是我需要的。我需要在照片库应用程序中旋转类似精灵的照片 - (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { NSArray *allTouch = [touches allObjects]; if([allTouch count] > 1){ UITouch *touch =

我如何在ccTouchesMoved中旋转sprite在cocos2d中的中心。我找到了一些代码,但这不是我需要的。我需要在照片库应用程序中旋转类似精灵的照片


- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    NSArray *allTouch = [touches allObjects];
    if([allTouch count] > 1){
        UITouch *touch = [allTouch objectAtIndex:0];
        CGPoint point = [touch locationInView: [touch view]];
        point = [[CCDirector sharedDirector] convertToGL:point];

        float angleRadians = atanf((float)point.y / (float)point.x);
        float angleDegrees = CC_RADIANS_TO_DEGREES(angleRadians);
        float cocosAngle = -1 * angleDegrees;
        imageFromPicker.rotation = imageFromPicker.rotation + cocosAngle;

    }
}

也许这不是最好的方法,但我用这个:

当我用两个手指触摸精灵时,我使用两点的圆弧旋转精灵:

首先,我使用此函数查找方向:

static inline int ccw(CGPoint p0, CGPoint p1, CGPoint p2)
{
    int dx1, dx2, dy1, dy2;

    dx1 = p1.x - p0.x; dy1 = p1.y - p0.y;
    dx2 = p2.x - p0.x; dy2 = p2.y - p0.y;

    int v1 = dx1 * dy2;
    int v2 = dy1 * dx2;

    if (v1 > v2)
        return 1;

    if (v1 < v2)
        return -1;

    if ((dx1*dx2 < 0) || (dy1*dy2 < 0))
        return -1;

    if ((dx1*dx1 + dy1*dy1) < (dx2*dx2 + dy2*dy2))
        return 1;

    return 0;
}
静态内联int ccw(CGPoint p0、CGPoint p1、CGPoint p2)
{
int dx1,dx2,dy1,dy2;
dx1=p1.x-p0.x;dy1=p1.y-p0.y;
dx2=p2.x-p0.x;dy2=p2.y-p0.y;
int v1=dx1*dy2;
int v2=dy1*dx2;
如果(v1>v2)
返回1;
如果(v1
在使用CCTouchsMoved方法后,我会这样做:

if ([allTouches count] == 2) {
            rotating=TRUE;
            NSArray *twoTouches = [allTouches allObjects];
            UITouch *first = [twoTouches objectAtIndex:0];
            UITouch *second = [twoTouches objectAtIndex:1];

            CGPoint a = [first previousLocationInView:[touch view]];
            CGPoint b = [second previousLocationInView:[touch view]];
            CGPoint c = [first locationInView:[touch view]];



            int direction =ccw(b, a, c);
            float pX= fabs(c.x-b.x);
            float pY= fabs(c.y-b.y);

            float rotation  = atan2(pY, pX);
        //  rotTotal= (rotTotal+rotacion)/10;
            if(direction<0)
            YourSprite.rotation=(YourSprite.rotation-rotation);
            else
            YourSprite.rotation=(YourSprite.rotation+rotation);

             }
if([AllTouchs count]==2){
旋转=真;
NSArray*TwoTouchs=[AllTouchs AllObject];
UITouch*first=[TwoTouchs对象索引:0];
UITouch*second=[TwoTouchs对象索引:1];
CGA点=[first previousLocationInView:[touch view]];
CGB点=[second previousLocationInView:[touch view]];
CGPoint c=[第一个位置视图:[触摸视图]];
内部方向=逆时针方向(b、a、c);
浮动pX=fabs(c.x-b.x);
浮动pY=晶圆厂(c.y-b.y);
浮动旋转=atan2(pY,pX);
//rototal=(rototal+rotacion)/10;

如果(方向如果你想更平滑地旋转,你可以在这里添加一个系数float rotation=atan2(pY,pX)*coef;它可以工作:)我添加了一个系数,它看起来非常好。我还添加了缩放方法,剩下的就是添加遮罩,然后保存精灵。谢谢!