Kulexiu/KulexiuForStudent/KulexiuForStudent/Module/Widget/View/WidgetSpeedView.m

//
//  WidgetSpeedView.m
//  KulexiuForStudent
//
//  Created by 王智 on 2022/9/13.
//

#import "WidgetSpeedView.h"

@interface WidgetSpeedView ()
{
    CGFloat _lastPointAngle;//上一个点相对于x轴角度
    CGPoint _centerPoint;
}

@property (weak, nonatomic) IBOutlet UIImageView *nodeImage;

@property (weak, nonatomic) IBOutlet UILabel *speedLabel;

@property (weak, nonatomic) IBOutlet UIView *bgView;

/** 控制频率View */
@property (nonatomic, strong) UIImageView *controlSpeedView;

@end

@implementation WidgetSpeedView
- (void)awakeFromNib {
    [super awakeFromNib];
    [self createUI];
}

+ (instancetype)shareInstance {
    WidgetSpeedView *view = [[[NSBundle mainBundle] loadNibNamed:@"WidgetSpeedView" owner:nil options:nil] firstObject];
    return view;
}

- (void)createUI {
    _centerPoint = CGPointMake(300 / 2, kScreenWidth / 2);//中心点
    
    self.controlSpeedView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"speed_dot"]];
    [self.bgView addSubview:self.controlSpeedView];
    [self.controlSpeedView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.right.bottom.left.mas_equalTo(self.bgView);
    }];
    
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self];
    //计算上一个点相对于x轴的角度
    CGFloat lastPointRadius = sqrt(pow(point.y - _centerPoint.y, 2) + pow(point.x - _centerPoint.x, 2));
    if (lastPointRadius == 0) {
        return;
    }
    _lastPointAngle = acos((point.x - _centerPoint.x) / lastPointRadius);
    if (point.y > _centerPoint.y) {
        _lastPointAngle = 2 * M_PI - _lastPointAngle;
    }
}

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

    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self];
    
    //1.计算当前点相对于x轴的角度
    CGFloat currentPointRadius = sqrt(pow(currentPoint.y - _centerPoint.y, 2) + pow(currentPoint.x - _centerPoint.x, 2));
    if (currentPointRadius == 0) {//当点在中心点时，被除数不能为0
        return;
    }
    CGFloat curentPointAngle = acos((currentPoint.x - _centerPoint.x) / currentPointRadius);
    if (currentPoint.y > _centerPoint.y) {
        curentPointAngle = 2 * M_PI - curentPointAngle;
    }
    //2.变化的角度
    CGFloat angle = _lastPointAngle - curentPointAngle;
    // 小点点的位置
    self.controlSpeedView.transform = CGAffineTransformRotate(self.controlSpeedView.transform, angle);
    _lastPointAngle = curentPointAngle;
    if (angle > 0) {
        if (self.delegate && [self.delegate respondsToSelector:@selector(changeSpeedWithIsAdd:speed:)]) {

            [self.delegate changeSpeedWithIsAdd:YES speed:MIN(1, MAX(angle *2, 1))];
        }
    }else {
        if (self.delegate && [self.delegate respondsToSelector:@selector(changeSpeedWithIsAdd:speed:)]) {
            [self.delegate changeSpeedWithIsAdd:NO speed:MIN(1, MAX(angle *2, 1))];
        }
    }
}

- (void)setSpeed:(int)speed {
    _speed = speed;
    self.speedLabel.text = [NSString stringWithFormat:@"%d", speed];
}


- (void)setCurrentType:(KSWidgeMetronomeType)currentType {
    _currentType = currentType;
    switch (currentType) {
        case KSWidgeMetronomeType1V2:
        case KSWidgeMetronomeType2V2:
        {
            [self.nodeImage setImage:[UIImage imageNamed:@"half_node"]];
        }
            break;
        case KSWidgeMetronomeType1V4:
        case KSWidgeMetronomeType2V4:
        case KSWidgeMetronomeType3V4:
        case KSWidgeMetronomeType4V4:
        {
            [self.nodeImage setImage:[UIImage imageNamed:@"quarter_node"]];
        }
            break;
        case KSWidgeMetronomeType3V8:
        case KSWidgeMetronomeType6V8:
        {
            [self.nodeImage setImage:[UIImage imageNamed:@"eighth_node"]];
        }
            break;
        default:
            break;
    }
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end