如何调整和移动CAShapeLayer的大小？

Question

我有一个由UIBezierPath绘制的CAShapeLayer，但是不知何故，应用于贝塞尔曲线上的平移和缩放并未在绘制时传递到CAShapeLayer。有没有办法将相同的变换应用于它？以下是我的贝塞尔曲线代码：

//// General Declarations
CGContextRef context = UIGraphicsGetCurrentContext();
UIColor *color = [UIColor colorWithRed: 1 green: 1 blue: 1 alpha: 1];

///Where the Transformations are
CGContextTranslateCTM(context, 52.7, 45.46);
CGContextScaleCTM(context, 0.5, 0.5);

UIBezierPath *trackPath = UIBezierPath.bezierPath;
[trackPath moveToPoint: CGPointMake(-28.3, 160.72)];
[trackPath addCurveToPoint: CGPointMake(125.37, -41.18) controlPoint1: CGPointMake(-28.3, 160.72) controlPoint2: CGPointMake(-11.62, -41.18)];
[trackPath addCurveToPoint: CGPointMake(279.04, 160.72) controlPoint1: CGPointMake(262.36, -41.18) controlPoint2: CGPointMake(279.04, 160.72)];
[trackPath moveToPoint: CGPointMake(279.04, 160.82)];
[trackPath addCurveToPoint: CGPointMake(432.7, 362.72) controlPoint1: CGPointMake(279.04, 160.82) controlPoint2: CGPointMake(295.72, 362.72)];
[trackPath moveToPoint: CGPointMake(-28.76, 160.82)];
[trackPath addCurveToPoint: CGPointMake(-182.43, 362.72) controlPoint1: CGPointMake(-28.76, 160.82) controlPoint2: CGPointMake(-45.45, 362.72)];

CGContextSaveGState(context);
[color setStroke];
trackPath.lineWidth = 1;
[trackPath stroke];
CGContextDrawPath(context, kCGPathFill);
CGContextRestoreGState(context);

这是我的CAShapeLayer。

raceTrack = [CAShapeLayer layer];
    raceTrack.path = trackPath.CGPath;
    raceTrack.strokeColor = [UIColor whiteColor].CGColor;
    raceTrack.fillColor = [UIColor clearColor].CGColor;
    raceTrack.lineWidth = 1;
    [self.layer addSublayer:raceTrack];

- Infineon Labs

Answer 1

你这样做是不对的，你需要将变换应用于CAShapeLayer本身。

CATransform3D translate = CATransform3DMakeTranslation(52.7, 45.46, 0);
CATransform3D scale = CATransform3DMakeScale(0.5, 0.5, 1);
CATransform3D transform = CATransform3DConcat(translate, scale);

CAShapeLayer *raceTrack = [CAShapeLayer layer];
raceTrack.transform = transform;

- Wan Lutfi Wan Hatta