iOS中判断两个圆是否重叠

#import <Foundation/Foundation.h>
#import <math.h>
@interface Point2D : NSObject
{
    double _x; // x值
    double _y; // y值
}

// x值的getter和setter
- (void)setX:(double)x;
- (double)x;

// y值的getter和setter
- (void)setY:(double)y;
- (double)y;

// 同时设置x和y
- (void)setX:(double)x andY:(double)y;

//计算根其他点距离
- (double)distanceWithOther:(Point2D *)other;

//类方法计算两个点之间的距离
+ (double)distanceWithOther1:(Point2D *)p1 andPoint2:(Point2D *)p2;

@end

@implementation Point2D

// x值的getter和setter
- (void)setX:(double)x
{
    self->_x = x;
}
- (double)x
{
    return _x;
}

// y值的getter和setter
- (void)setY:(double)y
{
    self->_y = y;
}
- (double)y
{
    return _y;
}
// 同时设置x和y
- (void)setX:(double)x andY:(double)y
{
    [self setX:x];
    [self setY:y];
}

//计算两个点之间的距离
- (double)distanceWithOther:(Point2D *)other
{
    //return [Point2D distanceWithOther1:self andPoint2:other];
    double xDelta = [self x] - [other x];

    double xDeltaPF = pow(xDelta, 2);

    double yDelta = [self y] - [other y];

    double yDeltaPF = pow(yDelta, 2);

    return sqrt(xDeltaPF + yDeltaPF);
}
//类方法计算两个点之间的距离
+ (double)distanceWithOther1:(Point2D *)p1 andPoint2:(Point2D *)p2
{
    // 调用在类方法中的对方法
    return [p1 distanceWithOther:p2];
}
@end

@interface Circle : NSObject
{
    //半径
    double _radius;
    //圆心
    Point2D *_point;
}

// 半径的getter和setter
- (void)setRadius:(double)radius;
- (double)radius;

//圆心的getter和setter
- (void)setPoint:(Point2D *)point;
- (Point2D *)point;

//判断两个圆是否重叠
//类方法
+ (BOOL)isInteractBetweenCircle1:(Circle *)c1 andCircle2:(Circle *)c2;
//对象方法
- (BOOL)isInteractBetweenCircle:(Circle *)other;

@end

@implementation Circle

// 半径的getter和setter
- (void)setRadius:(double)radius
{
    _radius = radius;
}
- (double)radius
{
    return _radius;
}

//圆心的getter和setter
- (void)setPoint:(Point2D *)point
{
    _point = point;
}
- (Point2D *)point;
{
    return _point;
}

//对象方法
- (BOOL)isInteractBetweenCircle:(Circle *)other
{
//看圆心距离和半径长度关系
    //圆心长度
    Point2D *p1 = [self point];
    Point2D *p2 = [other point];
    double distance = [p1 distanceWithOther:p2]; //5
    //半径和
    NSLog(@"圆心长 %f",distance);
    double radiusSum = [self radius] + [other radius];  //7
     NSLog(@"半径长 %f",radiusSum);
    return distance < radiusSum;
}
//判断是否重叠
+ (BOOL)isInteractBetweenCircle1:(Circle *)c1 andCircle2:(Circle *)c2
{
    return [c1 isInteractBetweenCircle:c2];
}
@end

int main()
{
    //凡是对象都有*
    /*
    Point2D *p1 = [Point2D new];
    [p1 setX:10 andY:15];

    Point2D *p2 = [Point2D new];

    [p2 setX:10 andY:12];

    //double d1 = [p1 distanceWithOther:p2];
    double d1 = [Point2D distanceWithOther1:p1 andPoint2:p2];
    NSLog(@"%f ", d1);

    */
    //c1
    Circle *c1 = [Circle new];
    [c1 setRadius:5];
    Point2D *p1 = [Point2D new];

    [p1 setX:10 andY:15];

    [c1 setPoint:p1];

    [[c1 point] setX:15];
    //c1 5  (15,15)
    //c2
    Circle *c2 = [Circle new];
    [c2 setRadius:2];
    Point2D *p2 = [Point2D new];

    [p2 setX:12 andY:19];
    //设置圆心
    [c2 setPoint:p2];

    //c2 2 (12,19)
    BOOL b1 = [c1 isInteractBetweenCircle:c2];
    NSLog(@"%d",b1);
    if (b1) {
        NSLog(@"重叠");
    }else
        NSLog(@"不重叠");
    return 0;
}