10

私はブラッドラーセンのトラックボールアプリの適応で遊んでいます。
互いに60度の角度で2つのビューがあり、この（閉じていない）長方形の中心で回転をどのように取得するのか疑問に思っていましたか？

下の画像では、回転がすべて青い線の内側で行われるようにしたいと思います。

ここに画像の説明を入力してください ここに画像の説明を入力してください ここに画像の説明を入力してください

コード（x軸を中心にのみ回転するように変更）：

#import "MyView.h"

//=====================================================
// Defines
//=====================================================

#define DEGREES_TO_RADIANS(degrees) \
    (degrees * (M_PI / 180.0f))

//=====================================================
// Public Interface
//=====================================================

@implementation MyView

- (void)awakeFromNib
{
    transformed = [CALayer layer];
    transformed.anchorPoint = CGPointMake(0.5f, 0.5f);

    transformed.frame = self.bounds;
    [self.layer addSublayer:transformed];

    CALayer *imageLayer = [CALayer layer];
    imageLayer.frame = CGRectMake(10.0f, 4.0f, self.bounds.size.width / 2.0f, self.bounds.size.height / 2.0f);
    imageLayer.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(60.0f), 1.0f, 0.0f, 0.0f);
    imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0051.png"] CGImage];
    imageLayer.borderColor = [UIColor yellowColor].CGColor;
    imageLayer.borderWidth = 2.0f;
    [transformed addSublayer:imageLayer];

    imageLayer = [CALayer layer];
    imageLayer.frame = CGRectMake(10.0f, 120.0f, self.bounds.size.width / 2.0f, self.bounds.size.height / 2.0f);
    imageLayer.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(-60.0f), 1.0f, 0.0f, 0.0f);
    imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0089.png"] CGImage];
    imageLayer.borderColor = [UIColor greenColor].CGColor;
    imageLayer.borderWidth = 2.0f;

    transformed.borderColor = [UIColor whiteColor].CGColor;
    transformed.borderWidth = 2.0f;
    [transformed addSublayer:imageLayer];

    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height / 2.0f, self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor redColor]];
    [self addSubview:line];

    line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (1.0f / 4.0f), self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor blueColor]];
    [self addSubview:line];

    line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (3.0f / 4.0f), self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor blueColor]];
    [self addSubview:line];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    previousLocation = [[touches anyObject] locationInView:self];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint location = [[touches anyObject] locationInView:self];
    //location = CGPointMake(previousLocation.x, location.y);

    CATransform3D currentTransform = transformed.sublayerTransform;

    //CGFloat displacementInX = location.x - previousLocation.x;
    CGFloat displacementInX = previousLocation.x - location.x;
    CGFloat displacementInY = previousLocation.y - location.y;

    CGFloat totalRotation = sqrt((displacementInX * displacementInX) + (displacementInY * displacementInY));

    CGFloat angle = DEGREES_TO_RADIANS(totalRotation);
    CGFloat x = ((displacementInX / totalRotation) * currentTransform.m12 + (displacementInY/totalRotation) * currentTransform.m11);

    CATransform3D rotationalTransform = CATransform3DRotate(currentTransform, angle, x, 0, 0);

    previousLocation = location;
    transformed.sublayerTransform = rotationalTransform;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
}

- (void)dealloc {
  [super dealloc];
}

@end
4

3 に答える 3

2

imageLayer.zPosition三角形の各辺のを、三角形の中心（この場合は正三角形）からの距離に設定する必要があります。

もしそうsideHeight = self.bounds.size.height / 2.0f;
ならdistanceFromCenter = ((sideHeight / 2.0f) / sqrt(3));

また、側面の回転を設定するときは、それらを必要な位置に移動する必要があります（コードではハードコードされています）。

更新されたコード

- (void)awakeFromNib
{
    transformed = [CALayer layer];
    transformed.anchorPoint = CGPointMake(0.5f, 0.5f);

    transformed.frame = self.bounds;
    [self.layer addSublayer:transformed];

    CGFloat sideHeight = self.bounds.size.height / 2.0f;
    CGFloat distanceFromCenter = ((sideHeight / 2.0f) / sqrt(3));

    CGFloat sideC = sideHeight / 2.0f;
    CGFloat sideA = sideC / 2.0f;
    CGFloat sideB = (sqrt(3) * sideA);

    CALayer *imageLayer = [CALayer layer];
    imageLayer.frame = CGRectMake(10.0f, (self.bounds.size.height / 2.0f) - (sideHeight / 2.0f), self.bounds.size.width / 2.0f, sideHeight);
    imageLayer.transform = CATransform3DConcat(CATransform3DMakeRotation(-DEGREES_TO_RADIANS(60.0f), 1.0f, 0.0f, 0.0f),
                                               CATransform3DMakeTranslation(0, -sideA, -sideB));
    imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0051.png"] CGImage];
    imageLayer.borderColor = [UIColor yellowColor].CGColor;
    imageLayer.borderWidth = 2.0f;
    imageLayer.zPosition = distanceFromCenter;
    [transformed addSublayer:imageLayer];

    imageLayer = [CALayer layer];
    imageLayer.frame = CGRectMake(10.0f, (self.bounds.size.height / 2.0f) - (sideHeight / 2.0f), self.bounds.size.width / 2.0f, sideHeight);
    imageLayer.transform = CATransform3DConcat(CATransform3DMakeRotation(DEGREES_TO_RADIANS(60.0f), 1.0f, 0.0f, 0.0f),
                                               CATransform3DMakeTranslation(0, sideA, -sideB));
    imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0089.png"] CGImage];
    imageLayer.borderColor = [UIColor greenColor].CGColor;
    imageLayer.zPosition = distanceFromCenter;
    imageLayer.borderWidth = 2.0f;

    transformed.borderColor = [UIColor whiteColor].CGColor;
    transformed.borderWidth = 2.0f;
    [transformed addSublayer:imageLayer];

    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height / 2.0f, self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor redColor]];
    [self addSubview:line];

    line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (1.0f / 4.0f), self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor blueColor]];
    [self addSubview:line];

    line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (3.0f / 4.0f), self.bounds.size.width, 2)];
    [line setBackgroundColor:[UIColor blueColor]];
    [self addSubview:line];
}
于 2012-11-24T23:01:55.087 に答える
1

他の変換も使用し（変換が必要になると思います）、それらを回転と連結します。この例では、画像を拡大縮小することもできるため、拡大縮小、シフト、回転されたレイヤーを取得できます。

CATransform3D translate = CATransform3DMakeTranslation(yourShiftByX, yourShiftByY, 0);
CATransform3D scale = CATransform3DMakeScale(yourRateX, yourRateY, 1);
CATransform3D rotate = CATransform3DMakeRotation(DEGREES_TO_RADIANS(60.0f), 1.0, 0.0, 0.0);
CATransform3D transform = CATransform3DConcat(CATransform3DConcat(rotate, scale), translate);
// the order is important: FIRST we rotate, THEN we scale and AT LAST we position the object

// now apply 'transform' to your layer
于 2012-11-19T13:49:29.050 に答える
0

パースペクティブを表示するには、imageViewをsuperViewにする必要があります。 

CATransform3D tranfrom = CATransform3DIdentity;
tranfrom.m34 = -1.0 / z;
imageView.superview.layer.transform = transfrom;
于 2012-11-21T15:01:29.503 に答える