Objective c iPhone中的扭曲图像

需要使用滑块扭曲图像而不降低图像/图像视图的高度 我尝试过3d变换，但它不能保持高度不变

--编辑 使用下面的代码

浮动角度=（360*self.slider.value）

---

这可以在3d中工作和旋转，但我需要像图中给出的那样扭曲图像

我自己从其他答案中得到了解决方案

- (IBAction)onSkewChange:(UISlider *)sender {

    if (sender.tag == 100) {
        self.bottomSlider.value=0;
    }else if (sender.tag == 200) {
        self.topSlider.value=0;
    }

    [self skewTestOnLayer:self.photoImageView.layer];
}

-(void)skewTestOnLayer:(CALayer*)l{

    float topValue = (self.photoImageView.frame.size.width * (self.topSlider.value/100) )/2;
    float bottomValue = (self.photoImageView.frame.size.width * (self.bottomSlider.value/100) )/2;

    CGPoint topLeft = CGPointMake(l.frame.origin.x + topValue, l.frame.origin.y);
    CGPoint topRight = CGPointMake(l.frame.origin.x + l.frame.size.width - topValue, l.frame.origin.y);


    CGPoint bottomLeft = CGPointMake(l.frame.origin.x + bottomValue, l.frame.origin.y+l.frame.size.height);
    CGPoint bottomRight = CGPointMake(l.frame.origin.x+l.frame.size.width - bottomValue, l.frame.origin.y+l.frame.size.height);

    [self transformToFitQuadTopLeft:topLeft topRight:topRight bottomLeft:bottomLeft bottomRight:bottomRight];

}

- (void)transformToFitQuadTopLeft:(CGPoint)tl topRight:(CGPoint)tr bottomLeft:(CGPoint)bl bottomRight:(CGPoint)br
{
    self.photoImageView.layer.anchorPoint = CGPointZero;

    CGRect boundingBox = [[self class] boundingBoxForQuadTR:tr tl:tl bl:bl br:br];
    //NSLog(@"bounding box = %@",NSStringFromCGRect(boundingBox));
    self.photoImageView.frame = boundingBox;

    CGPoint frameTopLeft = boundingBox.origin;
    CATransform3D transform = [[self class] rectToQuad:self.photoImageView.bounds
                                                quadTL:CGPointMake(tl.x-frameTopLeft.x, tl.y-frameTopLeft.y)
                                                quadTR:CGPointMake(tr.x-frameTopLeft.x, tr.y-frameTopLeft.y)
                                                quadBL:CGPointMake(bl.x-frameTopLeft.x, bl.y-frameTopLeft.y)
                                                quadBR:CGPointMake(br.x-frameTopLeft.x, br.y-frameTopLeft.y)];

    self.photoImageView.layer.transform = transform;

}

+ (CGRect)boundingBoxForQuadTR:(CGPoint)tr tl:(CGPoint)tl bl:(CGPoint)bl br:(CGPoint)br
{
    CGRect boundingBox = CGRectZero;

    CGFloat xmin = MIN(MIN(MIN(tr.x, tl.x), bl.x),br.x);
    CGFloat ymin = MIN(MIN(MIN(tr.y, tl.y), bl.y),br.y);
    CGFloat xmax = MAX(MAX(MAX(tr.x, tl.x), bl.x),br.x);
    CGFloat ymax = MAX(MAX(MAX(tr.y, tl.y), bl.y),br.y);

    boundingBox.origin.x = xmin;
    boundingBox.origin.y = ymin;
    boundingBox.size.width = xmax - xmin;
    boundingBox.size.height = ymax - ymin;

    return boundingBox;
}

+ (CATransform3D)rectToQuad:(CGRect)rect
                     quadTL:(CGPoint)topLeft
                     quadTR:(CGPoint)topRight
                     quadBL:(CGPoint)bottomLeft
                     quadBR:(CGPoint)bottomRight
{
    return [self rectToQuad:rect quadTLX:topLeft.x quadTLY:topLeft.y quadTRX:topRight.x quadTRY:topRight.y quadBLX:bottomLeft.x quadBLY:bottomLeft.y quadBRX:bottomRight.x quadBRY:bottomRight.y];
}

+ (CATransform3D)rectToQuad:(CGRect)rect
                    quadTLX:(CGFloat)x1a
                    quadTLY:(CGFloat)y1a
                    quadTRX:(CGFloat)x2a
                    quadTRY:(CGFloat)y2a
                    quadBLX:(CGFloat)x3a
                    quadBLY:(CGFloat)y3a
                    quadBRX:(CGFloat)x4a
                    quadBRY:(CGFloat)y4a
{
    CGFloat X = rect.origin.x;
    CGFloat Y = rect.origin.y;
    CGFloat W = rect.size.width;
    CGFloat H = rect.size.height;

    CGFloat y21 = y2a - y1a;
    CGFloat y32 = y3a - y2a;
    CGFloat y43 = y4a - y3a;
    CGFloat y14 = y1a - y4a;
    CGFloat y31 = y3a - y1a;
    CGFloat y42 = y4a - y2a;

    CGFloat a = -H*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42);
    CGFloat b = W*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43);
    CGFloat c = H*X*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42) - H*W*x1a*(x4a*y32 - x3a*y42 + x2a*y43) - W*Y*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43);

    CGFloat d = H*(-x4a*y21*y3a + x2a*y1a*y43 - x1a*y2a*y43 - x3a*y1a*y4a + x3a*y2a*y4a);
    CGFloat e = W*(x4a*y2a*y31 - x3a*y1a*y42 - x2a*y31*y4a + x1a*y3a*y42);
    CGFloat f = -(W*(x4a*(Y*y2a*y31 + H*y1a*y32) - x3a*(H + Y)*y1a*y42 + H*x2a*y1a*y43 + x2a*Y*(y1a - y3a)*y4a + x1a*Y*y3a*(-y2a + y4a)) - H*X*(x4a*y21*y3a - x2a*y1a*y43 + x3a*(y1a - y2a)*y4a + x1a*y2a*(-y3a + y4a)));

    CGFloat g = H*(x3a*y21 - x4a*y21 + (-x1a + x2a)*y43);
    CGFloat h = W*(-x2a*y31 + x4a*y31 + (x1a - x3a)*y42);
    CGFloat i = W*Y*(x2a*y31 - x4a*y31 - x1a*y42 + x3a*y42) + H*(X*(-(x3a*y21) + x4a*y21 + x1a*y43 - x2a*y43) + W*(-(x3a*y2a) + x4a*y2a + x2a*y3a - x4a*y3a - x2a*y4a + x3a*y4a));

    const double kEpsilon = 0.0001;

    if(fabs(i) < kEpsilon)
    {
        i = kEpsilon* (i > 0 ? 1.0 : -1.0);
    }

    CATransform3D transform = {a/i, d/i, 0, g/i, b/i, e/i, 0, h/i, 0, 0, 1, 0, c/i, f/i, 0, 1.0};

    return transform;
}

-（iAction）onSkewChange:（UISlider*）发送方{
如果（sender.tag==100）{
self.bottomSlider.value=0；
}else if（sender.tag==200）{
自上滑道值=0；
}
[self-skewTestOnLayer:self.photoImageView.layer]；
}
-（void）skewTestOnLayer:（CALayer*）l{
float topValue=（self.photoImageView.frame.size.width*（self.topSlider.value/100））/2；
float bottomValue=（self.photoImageView.frame.size.width*（self.bottomSlider.value/100））/2；
CGPoint topLeft=CGPointMake（l.frame.origin.x+topValue，l.frame.origin.y）；
CGPoint topRight=CGPointMake（l.frame.origin.x+l.frame.size.width-topValue，l.frame.origin.y）；
CGPoint bottomLeft=CGPointMake（l.frame.origin.x+bottomValue，l.frame.origin.y+l.frame.size.height）；
CGPoint bottomRight=CGPointMake（l.frame.origin.x+l.frame.size.width-bottomValue，l.frame.origin.y+l.frame.size.height）；
[自转换为itquadtopleft：上左上右：上右下左：下左下右：下右]；
}
-（void）transformToFitQuadTopLeft:（CGPoint）tl topRight:（CGPoint）tr bottomLeft:（CGPoint）bl bottomRight:（CGPoint）br
{
self.photoImageView.layer.ancorpoint=CGPointZero；
CGRect BONDINGBOX=[[self class]boundingBoxForQuadTR:tr tl:tl bl:bl br:br]；
//NSLog（@“bounding box=%@），NSStringFromCGRect（boundingBox））；
self.photoImageView.frame=boundingBox；
CGPoint frameTopLeft=boundingBox.origin；
CATTransformM3D transform=[[self class]rectToQuad:self.photoImageView.bounds
quadTL:CGPointMake（tl.x-frameTopLeft.x，tl.y-frameTopLeft.y）
quadTR:CGPointMake（tr.x-frameTopLeft.x，tr.y-frameTopLeft.y）
quadBL:CGPointMake（bl.x-frameTopLeft.x，bl.y-frameTopLeft.y）
quadBR:CGPointMake（br.x-frameTopLeft.x，br.y-frameTopLeft.y）]；
self.photoImageView.layer.transform=变换；
}
+（CGRect）boundingBoxForQuadTR:（CGPoint）tr tl:（CGPoint）tl bl:（CGPoint）bl br:（CGPoint）br
{
CGRect boundingBox=CGRectZero；
CGFloat xmin=MIN（MIN（MIN（tr.x，tl.x），bl.x），br.x）；
cgymin=MIN（MIN（MIN（tr.y，tl.y），bl.y），br.y）；
CGFloat xmax=MAX（MAX（MAX（tr.x，tl.x），bl.x），br.x）；
cgymax=MAX（MAX（MAX（MAX（tr.y，tl.y），bl.y），br.y）；
boundingBox.origin.x=xmin；
boundingBox.origin.y=ymin；
boundingBox.size.width=xmax-xmin；
boundingBox.size.height=ymax-ymin；
返回边界框；
}
+（CATTransferM3D）rectToQuad:（CGRect）rect
四边形：（CGPoint）左上角
quadTR：（CGPoint）右上角
quadBL：（CGPoint）左下角
quadBR：（CGPoint）右下角
{
return[self-rectToQuad:rect-quadTLX:topLeft.x-quadTLY:topLeft.y-quadTRX:topRight.x-quadTRY:topRight.y-quadBLX:bottomLeft.x-quadBRX:bottomRight.x-quadBRY:bottomRight.y]；
}
+（CATTransferM3D）rectToQuad:（CGRect）rect
quadTLX：（CGFloat）x1a
四：（CGFloat）y1a
quadTRX：（CGFloat）x2a
四次：（CGFloat）y2a
quadBLX：（CGFloat）x3a
四：（CGFloat）y3a
quadBRX：（CGFloat）x4a
四次：（CGFloat）y4a
{
CGFloat X=rect.origin.X；
CGFloat Y=矩形原点Y；
CGFloat W=rect.size.width；
CGH=矩形尺寸高度；
CGY21=y2a-y1a；
CGY32=y3a-y2a；
CGY43=y4a-y3a；
CGY14=y1a-y4a；
CGY31=y3a-y1a；
CGY42=y4a-y2a；
CGA=-H*（x2a*x3a*y14+x2a*x4a*y31-x1a*x4a*y32+x1a*x3a*y42）；
CGFloat b=W*（x2a*x3a*y14+x3a*x4a*y21+x1a*x4a*y32+x1a*x2a*y43）；
CGFloat c=H*X*（x2a*x3a*y14+x2a*x4a*y31-x1a*x4a*y32+x1a*x3a*y42）-H*W*x1a*（x4a*y32-x3a*y42+x2a*y43）-W*Y*（x2a*x3a*y14+x3a*x4a*y21+x1a*x4a*y32+x1a*x2a*x2a*y43）；
CGFloat d=H*（-x4a*y21*y3a+x2a*y1a*y43-x1a*y2a*y43-x3a*y1a*y4a+x3a*y2a*y4a）；
cge=W*（x4a*y2a*y31-x3a*y1a*y42-x2a*y31*y4a+x1a*y3a*y42）；
CGF=-（W*（x4a*（Y*y2a*y31+H*y1a*y32）-x3a*（H+Y）*y1a*y42+H*x2a*y1a*y43+x2a*Y*（y1a-y3a）*y4a+x1a*Y*y3a*（-y2a+y4a））-H*X*（x4a*y21*y3a-x2a*y1a*y43+x3a*（y1a-y2a）*y4a+x1a*y2a*（-y3a+y4a））；
CGFloat g=H*（x3a*y21-x4a*y21+（-x1a+x2a）*y43）；
CGH=W*（-x2a*y31+x4a*y31+（x1a-x3a）*y42）；
CGFloat i=W*Y*（x2a*y31-x4a*y31-x1a*y42+x3a*y42）+H*（X*（（x3a*y21）+x4a*y21+x1a*y43-x2a*y43）+W*（（x3a*y2a）+x4a*y2a+x2a*y3a-x4a*y3a-x2a*y4a+x3a*y4a））；
常数双kEpsilon=0.0001；
if（晶圆厂（i）0？1.0:-1.0）；
}
CATTransferorM3D transform={a/i，d/i，0，g/i，b/i，e/i，0，h/i，0，0，0，1，0，c/i，f/i，0，1.0}；
回归变换；
}

您需要向我们展示您正在使用的不正常代码；这将给人们一个更好的机会来帮助你。浮动角度=（360*self.slider.value）；CATTransferM3D旋转和透视变换=CATTransferM3D实体；旋转和透视变换.m34=1.0/-500；旋转和透视变换=CATTransformorM3dRotate（旋转和透视变换，角度*M_PI/180.0f、1.0f、0.0f、0.0f）；self.marker.layer.transform=旋转和透视变换；使用此代码，它可以工作，但它会进行三维变换，所以它会降低图像视图的高度。我只是想扭曲图像，这样它的工作原理和我在图像中看到的一样

- (IBAction)onSkewChange:(UISlider *)sender {

    if (sender.tag == 100) {
        self.bottomSlider.value=0;
    }else if (sender.tag == 200) {
        self.topSlider.value=0;
    }

    [self skewTestOnLayer:self.photoImageView.layer];
}

-(void)skewTestOnLayer:(CALayer*)l{

    float topValue = (self.photoImageView.frame.size.width * (self.topSlider.value/100) )/2;
    float bottomValue = (self.photoImageView.frame.size.width * (self.bottomSlider.value/100) )/2;

    CGPoint topLeft = CGPointMake(l.frame.origin.x + topValue, l.frame.origin.y);
    CGPoint topRight = CGPointMake(l.frame.origin.x + l.frame.size.width - topValue, l.frame.origin.y);


    CGPoint bottomLeft = CGPointMake(l.frame.origin.x + bottomValue, l.frame.origin.y+l.frame.size.height);
    CGPoint bottomRight = CGPointMake(l.frame.origin.x+l.frame.size.width - bottomValue, l.frame.origin.y+l.frame.size.height);

    [self transformToFitQuadTopLeft:topLeft topRight:topRight bottomLeft:bottomLeft bottomRight:bottomRight];

}

- (void)transformToFitQuadTopLeft:(CGPoint)tl topRight:(CGPoint)tr bottomLeft:(CGPoint)bl bottomRight:(CGPoint)br
{
    self.photoImageView.layer.anchorPoint = CGPointZero;

    CGRect boundingBox = [[self class] boundingBoxForQuadTR:tr tl:tl bl:bl br:br];
    //NSLog(@"bounding box = %@",NSStringFromCGRect(boundingBox));
    self.photoImageView.frame = boundingBox;

    CGPoint frameTopLeft = boundingBox.origin;
    CATransform3D transform = [[self class] rectToQuad:self.photoImageView.bounds
                                                quadTL:CGPointMake(tl.x-frameTopLeft.x, tl.y-frameTopLeft.y)
                                                quadTR:CGPointMake(tr.x-frameTopLeft.x, tr.y-frameTopLeft.y)
                                                quadBL:CGPointMake(bl.x-frameTopLeft.x, bl.y-frameTopLeft.y)
                                                quadBR:CGPointMake(br.x-frameTopLeft.x, br.y-frameTopLeft.y)];

    self.photoImageView.layer.transform = transform;

}

+ (CGRect)boundingBoxForQuadTR:(CGPoint)tr tl:(CGPoint)tl bl:(CGPoint)bl br:(CGPoint)br
{
    CGRect boundingBox = CGRectZero;

    CGFloat xmin = MIN(MIN(MIN(tr.x, tl.x), bl.x),br.x);
    CGFloat ymin = MIN(MIN(MIN(tr.y, tl.y), bl.y),br.y);
    CGFloat xmax = MAX(MAX(MAX(tr.x, tl.x), bl.x),br.x);
    CGFloat ymax = MAX(MAX(MAX(tr.y, tl.y), bl.y),br.y);

    boundingBox.origin.x = xmin;
    boundingBox.origin.y = ymin;
    boundingBox.size.width = xmax - xmin;
    boundingBox.size.height = ymax - ymin;

    return boundingBox;
}

+ (CATransform3D)rectToQuad:(CGRect)rect
                     quadTL:(CGPoint)topLeft
                     quadTR:(CGPoint)topRight
                     quadBL:(CGPoint)bottomLeft
                     quadBR:(CGPoint)bottomRight
{
    return [self rectToQuad:rect quadTLX:topLeft.x quadTLY:topLeft.y quadTRX:topRight.x quadTRY:topRight.y quadBLX:bottomLeft.x quadBLY:bottomLeft.y quadBRX:bottomRight.x quadBRY:bottomRight.y];
}

+ (CATransform3D)rectToQuad:(CGRect)rect
                    quadTLX:(CGFloat)x1a
                    quadTLY:(CGFloat)y1a
                    quadTRX:(CGFloat)x2a
                    quadTRY:(CGFloat)y2a
                    quadBLX:(CGFloat)x3a
                    quadBLY:(CGFloat)y3a
                    quadBRX:(CGFloat)x4a
                    quadBRY:(CGFloat)y4a
{
    CGFloat X = rect.origin.x;
    CGFloat Y = rect.origin.y;
    CGFloat W = rect.size.width;
    CGFloat H = rect.size.height;

    CGFloat y21 = y2a - y1a;
    CGFloat y32 = y3a - y2a;
    CGFloat y43 = y4a - y3a;
    CGFloat y14 = y1a - y4a;
    CGFloat y31 = y3a - y1a;
    CGFloat y42 = y4a - y2a;

    CGFloat a = -H*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42);
    CGFloat b = W*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43);
    CGFloat c = H*X*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42) - H*W*x1a*(x4a*y32 - x3a*y42 + x2a*y43) - W*Y*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43);

    CGFloat d = H*(-x4a*y21*y3a + x2a*y1a*y43 - x1a*y2a*y43 - x3a*y1a*y4a + x3a*y2a*y4a);
    CGFloat e = W*(x4a*y2a*y31 - x3a*y1a*y42 - x2a*y31*y4a + x1a*y3a*y42);
    CGFloat f = -(W*(x4a*(Y*y2a*y31 + H*y1a*y32) - x3a*(H + Y)*y1a*y42 + H*x2a*y1a*y43 + x2a*Y*(y1a - y3a)*y4a + x1a*Y*y3a*(-y2a + y4a)) - H*X*(x4a*y21*y3a - x2a*y1a*y43 + x3a*(y1a - y2a)*y4a + x1a*y2a*(-y3a + y4a)));

    CGFloat g = H*(x3a*y21 - x4a*y21 + (-x1a + x2a)*y43);
    CGFloat h = W*(-x2a*y31 + x4a*y31 + (x1a - x3a)*y42);
    CGFloat i = W*Y*(x2a*y31 - x4a*y31 - x1a*y42 + x3a*y42) + H*(X*(-(x3a*y21) + x4a*y21 + x1a*y43 - x2a*y43) + W*(-(x3a*y2a) + x4a*y2a + x2a*y3a - x4a*y3a - x2a*y4a + x3a*y4a));

    const double kEpsilon = 0.0001;

    if(fabs(i) < kEpsilon)
    {
        i = kEpsilon* (i > 0 ? 1.0 : -1.0);
    }

    CATransform3D transform = {a/i, d/i, 0, g/i, b/i, e/i, 0, h/i, 0, 0, 1, 0, c/i, f/i, 0, 1.0};

    return transform;
}