長方形を円の周りで回転させようとしています。これまでのところ、さまざまな場所（主にここ： https ：//stackoverflow.com/a/4657476/861181）で見つけたコードをまとめた後、中心軸を中心に長方形を回転させることができます。
どうすれば円の周りを回転させることができますか？
これが私が持っているものです：OverlaySelectionView.h
#import <QuartzCore/QuartzCore.h>
@interface OverlaySelectionView : UIView {
@private
UIView* dragArea;
CGRect dragAreaBounds;
UIView* vectorArea;
UITouch *currentTouch;
CGPoint touchLocationpoint;
CGPoint PrevioustouchLocationpoint;
}
@property CGRect vectorBounds;
@end
OverlaySelectionView.m
#import "OverlaySelectionView.h"
@interface OverlaySelectionView()
@property (nonatomic, retain) UIView* vectorArea;
@end
@implementation OverlaySelectionView
@synthesize vectorArea, vectorBounds;
@synthesize delegate;
- (void) initialize {
self.userInteractionEnabled = YES;
self.multipleTouchEnabled = NO;
self.backgroundColor = [UIColor clearColor];
self.opaque = NO;
self.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(rotateVector:)];
panRecognizer.maximumNumberOfTouches = 1;
[self addGestureRecognizer:panRecognizer];
}
- (id) initWithCoder: (NSCoder*) coder {
self = [super initWithCoder: coder];
if (self != nil) {
[self initialize];
}
return self;
}
- (id) initWithFrame: (CGRect) frame {
self = [super initWithFrame: frame];
if (self != nil) {
[self initialize];
}
return self;
}
- (void)drawRect:(CGRect)rect {
if (vectorBounds.origin.x){
UIView* area = [[UIView alloc] initWithFrame: vectorBounds];
area.backgroundColor = [UIColor grayColor];
area.opaque = YES;
area.userInteractionEnabled = NO;
vectorArea = area;
[self addSubview: vectorArea];
}
}
- (void)rotateVector: (UIPanGestureRecognizer *)panRecognizer{
if (touchLocationpoint.x){
PrevioustouchLocationpoint = touchLocationpoint;
}
if ([panRecognizer numberOfTouches] >= 1){
touchLocationpoint = [panRecognizer locationOfTouch:0 inView:self];
}
CGPoint origin;
origin.x=240;
origin.y=160;
CGPoint previousDifference = [self vectorFromPoint:origin toPoint:PrevioustouchLocationpoint];
CGAffineTransform newTransform =CGAffineTransformScale(vectorArea.transform, 1, 1);
CGFloat previousRotation = atan2(previousDifference.y, previousDifference.x);
CGPoint currentDifference = [self vectorFromPoint:origin toPoint:touchLocationpoint];
CGFloat currentRotation = atan2(currentDifference.y, currentDifference.x);
CGFloat newAngle = currentRotation- previousRotation;
newTransform = CGAffineTransformRotate(newTransform, newAngle);
[self animateView:vectorArea toPosition:newTransform];
}
-(CGPoint)vectorFromPoint:(CGPoint)firstPoint toPoint:(CGPoint)secondPoint
{
CGPoint result;
CGFloat x = secondPoint.x-firstPoint.x;
CGFloat y = secondPoint.y-firstPoint.y;
result = CGPointMake(x, y);
return result;
}
-(void)animateView:(UIView *)theView toPosition:(CGAffineTransform) newTransform
{
[UIView setAnimationsEnabled:YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.0750];
vectorArea.transform = newTransform;
[UIView commitAnimations];
}
@end
ここに明確にする試みがあります。地図上の座標から長方形を作成しています。メインビューでその長方形を作成する関数は次のとおりです。基本的に、画面の中央にあります。
オーバーレイは、上記のコードで作成されたビューです。
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
if (!circle){
circle = [MKCircle circleWithCenterCoordinate: userLocation.coordinate radius:100];
[mainMapView addOverlay:circle];
CGPoint centerPoint = [mapView convertCoordinate:userLocation.coordinate toPointToView:self.view];
CGPoint upPoint = CGPointMake(centerPoint.x, centerPoint.y - 100);
overlay = [[OverlaySelectionView alloc] initWithFrame: self.view.frame];
overlay.vectorBounds = CGRectMake(upPoint.x, upPoint.y, 30, 100);
[self.view addSubview: overlay];
}
}
これが私が達成しようとしていることのスケッチです：
