对象方法、类方法 - 黑马程序员技术交流社区

/*************************************
1. 设计一个类Point2D，用来表示二维平面中某个点
1> 属性
* double x
* double y
2> 方法
* 属性相应的set和get方法
* 设计一个对象方法同时设置x和y
* 设计一个对象方法计算跟其他点的距离
* 设计一个类方法计算两个点之间的距离
3> 提示
C语言 math.h里面
double pow(double n,double m) ：计算n的m次方
double sqrt(double n) ：计算根号N的值
*************************************/
/*************************************
设计一个类Circle，用来表示二维平面中的圆
1> 属性
* double _radius (半径)
* Point2D *_point (圆心)
2> 方法
* 属性相应的set方法跟get方法
* 设计一个对象方法判断跟其他圆是否重叠（重叠返回yes,否则返回no）
* 设计一个类方法判断两个圆是否重叠（重叠返回yes，否则返回No）
*************************************/
#import <Foundation/Foundation.h>
#import <math.h>
@interface Point2D : NSObject
{
double _x;
double _y;
}
- (void)SetPoint2DX : (double)x andY : (double)y;
- (double)GetPointY;
- (double)GetPointX;
- (double)CountMyPointWithOtherPoint : (Point2D *) otherPoint;
+ (double)CountDistancePoint1 : (Point2D *)point1 WithPoint2 : (Point2D *)point2;
@end
@interface Circle : NSObject
{
double _radius; //半径
Point2D *_point; //圆心
}
- (void)SetRadius : (double)radius ;
- (void)SetPoint : (Point2D *) point ;
- (double)GetRadius;
- (Point2D *)GetPoint;
- (BOOL)JudgeSelfWithOtherCircle : (Circle *)circle ;
+ (BOOL)JudgeCircle : (Circle *)circle1 WithOtherCircle : (Circle *) circle2 ;
@end
@implementation Point2D
- (void)SetPoint2DX : (double)x andY : (double)y
{
_x = x;
_y = y;
return;
}
- (double)GetPointY
{
return _y;
}
- (double)GetPointX
{
return _x;
}
- (double)CountMyPointWithOtherPoint : (Point2D *) otherPoint
{
return [Point2D CountDistancePoint1 : self WithPoint2 : otherPoint];
}
+ (double)CountDistancePoint1 : (Point2D *)point1 WithPoint2 : (Point2D *)point2
{
double x_length,y_length,pTop_length;
//x_length = point1->_x - point2->_x;
x_length = [point1 GetPointX] - [point2 GetPointX];
//y_length = point1->_y - point2->_y;
y_length = [point1 GetPointY] - [point2 GetPointY];
pTop_length = sqrt((pow(x_length,2) + pow(y_length,2)));
//return [point1 CountMyPointWithOtherPoint:point2];
return pTop_length;
}
@end
@implementation Circle
- (void)SetRadius : (double)radius
{
if(radius > 0)
self->_radius = radius;
else
NSLog(@"SET ERROR!!!");
return;
}
- (void)SetPoint : (Point2D *) point
{
_point = point;
return;
}
- (double)GetRadius
{
return self->_radius ;
}
- (Point2D *)GetPoint
{
return self->_point;
}
- (BOOL)JudgeSelfWithOtherCircle : (Circle *)circle
{
return [Circle JudgeCircle : self WithOtherCircle : circle];
}
+ (BOOL)JudgeCircle : (Circle *)circle1 WithOtherCircle : (Circle *) circle2
{
Point2D *p1 = [circle1 GetPoint];
Point2D *p2 = [circle2 GetPoint];
double length_p1Top2 = [Point2D CountDistancePoint1 : p1 WithPoint2 : p2];
if(length_p1Top2 >= ([circle1 GetRadius] + [circle2 GetRadius]))
return NO;
else
return YES;
return 0;
}
@end
int main()
{
Circle *p_Circle1 = [Circle new];
Circle *p_Circle2 = [Circle new];
[p_Circle1 SetRadius:5];
[p_Circle2 SetRadius:6];
NSLog(@"圆一的半径为：%.2f",[p_Circle1 GetRadius]);
NSLog(@"圆二的半径为：%.2f",[p_Circle2 GetRadius]);
Point2D *p_point1 = [Point2D new];
Point2D *p_point2 = [Point2D new];
[p_point1 SetPoint2DX : 3 andY : 0];
[p_point2 SetPoint2DX : 3 andY : 4];
[p_Circle1 SetPoint:p_point1];
[p_Circle2 SetPoint:p_point2];
NSLog(@"圆一跟圆二重叠的情况是：%d",[Circle JudgeCircle : p_Circle1 WithOtherCircle : p_Circle2]);
// Point2D *p_Point1 ;
// Point2D *p_Point2 ;
//
// p_Point1 = [Point2D new];
// p_Point2 = [Point2D new];
//
// [p_Point1 SetPoint2DX : 0 andY : 0];
// [p_Point2 SetPoint2DX : 3 andY : 4];
//
// NSLog(@"点一到点二的距离为：%.2f",[Point2D CountDistancePoint1 : p_Point1 WithPoint2 : p_Point2]);
return 0;
}

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