怎么计算2个坐标点的距离？
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比如a坐标在 x轴50， y坐标在100
而b坐标在x轴的180，y坐标在220
怎么计算这2个坐标点之间的距离啊？
看我的用户名就知道我是数学白痴。。。
请分析的仔细点，我数学基础只有小学4年纪。。。。。
学勾股定理了没？
看书应该能明白：两坐标之间的距离为：√[(x1-x2)²+(y1-y2)²]
就上例来说两坐标的距离为：√[(180-50)²+(220-100)²]=10√313 参考技术A 根号(X1的平方-Y1的平方）的平方+（X2的平方-y2的平方）的平方 参考技术B 回答
您好啊，现在是晨晨答题时间，我正在为您查询，请稍等片刻哦，不要着急呢
提问？？？
回答我亲爱的用户，晨晨百科这边为您查询到的是以下几点内容：
您好亲亲，为您查询到了一些信息
111 111 itTEg111 111 4T5AőZÈ 111 坐示A结度111 4TBtZ JÈ 1// 坐标B纬度111 returns>private double AccountDistance( double lngA, double latA, double lngB, double latB)double DistanceLng = 192834. 74258626089786013677476285;double DistanceLat = 111712. 69150641655729984301412873;double LngAbs = Math.Abs((lngA - lngB) * DistanceLng);double LatAbs = Math.Abs((latA - latB) * DistanceLat);return Math . Sqrt((LatAbs * LatAbs + LngAbs * LngAbs));
这个用电脑写c语言程序就可以代出坐标了。
希望给你带来帮助，感谢您的理解与支持。祝您生活愉快！
随记－－确定两个地点的经纬度，自制驾车路线并计算其距离
使用地图，使用最多的也是百度地图API，以前使用百度地图只是表面地引用一下方法，很少点进方法或者对应属性的文件中，去查看其对应的说明与含义。
1.百度地图两点之间的距离
1 /** 2 3 *计算指定两点之间的距离 4 5 *@param a 第一个坐标点 6 7 *@param b 第二个坐标点 8 9 *@return 两点之间的距离，单位：米 10 11 */ 12 13 UIKIT_EXTERN CLLocationDistance BMKMetersBetweenMapPoints(BMKMapPoint a, BMKMapPoint b);
BMKMetersBetweenMapPoints方法只是两个经纬度之间的直线距离
2.路线实际距离
1 ///此类表示一条驾车路线 2 @interface BMKDrivingRouteLine : BMKRouteLine{ 3 bool _isSupportTraffic;//从2.7.0开始，废弃 4 NSArray* _wayPoints; 5 } 6 ///该路线所在区域是否含有交通流量信息，从2.7.0开始，废弃 7 @property (nonatomic) bool isSupportTraffic; 8 ///路线途经点列表，成员类型为BMKPlanNode 9 @property (nonatomic, strong) NSArray* wayPoints; 10 @end
1 ///此类表示路线数据结构的基类,表示一条路线，路线可能包括：路线规划中的换乘/驾车/步行路线 2 ///此类为路线数据结构的基类，一般关注其子类对象即可，无需直接生成该类对象 3 @interface BMKRouteLine : NSObject{ 4 int _distance; 5 BMKTime* _duration; 6 BMKRouteNode* _starting; 7 BMKRouteNode* _terminal; 8 NSString* _title; 9 NSArray* _steps; 10 } 11 ///路线长度 单位： 米 12 @property (nonatomic) int distance; 13 ///路线耗时 单位： 秒 14 @property (nonatomic, strong) BMKTime* duration; 15 ///路线起点信息 16 @property (nonatomic, strong) BMKRouteNode* starting; 17 ///路线终点信息 18 @property (nonatomic, strong) BMKRouteNode* terminal; 19 ///路线名称(预留字段，现为空) 20 @property (nonatomic, strong) NSString* title; 21 ///路线中的所有路段，成员类型为BMKWalkingStep，BMKDrivingStep，BMKTransitStep 22 @property (nonatomic, strong) NSArray* steps; 23 @end
将MBKDrivingRouteLine实例化，通过distance属性获取实际驾车路线距离
长话段说，直接贴上我的代码
在XXX.h文件中
1 #import <UIKit/UIKit.h> 2 #import "BMapKit.h" 3 4 @interface XXXViewController : UIViewController 5 6 //@property (weak, nonatomic) IBOutlet BMKMapView *mapView; 7 8 9 @property (nonatomic, assign) CLLocationCoordinate2D startCoor; 10 @property (nonatomic, assign) CLLocationCoordinate2D endCoor; 11 @property (nonatomic, copy) NSString *addrName; 12 13 @end
在XXX.m文件中
1 #import "XXX.h" 2 #import "UIImage+Rotate.h" 3 4 #import <MapKit/MapKit.h> 5 6 #define MYBUNDLE_NAME @ "mapapi.bundle" 7 #define MYBUNDLE_PATH [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: MYBUNDLE_NAME] 8 #define MYBUNDLE [NSBundle bundleWithPath: MYBUNDLE_PATH] 9 10 @interface RouteAnnotation : BMKPointAnnotation 11 { 12 int _type; ///<0:起点 1：终点 2：公交 3：地铁 4:驾乘 5:途经点 13 int _degree; 14 } 15 16 @property (nonatomic) int type; 17 @property (nonatomic) int degree; 18 @end 19 20 @implementation RouteAnnotation 21 22 @synthesize type = _type; 23 @synthesize degree = _degree; 24 @end 25 26 @interface ServerRepairViewController () <BMKMapViewDelegate, BMKRouteSearchDelegate> 27 { 28 BMKRouteSearch* _routesearch; 29 BMKMapView *_mapView; 30 UILabel *_distanceLab; 31 } 32 33 @end 34 35 @implementation ServerRepairViewController 36 37 - (void)viewDidLoad { 38 [super viewDidLoad]; 39 40 self.title = @"外出服务"; 41 // self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"驾车" style:UIBarButtonItemStylePlain target:self action:@selector(driveSearchAction)]; 42 43 _mapView = [[BMKMapView alloc] initWithFrame:CGRectMake(0, 0, K_ScreenWidth, K_ScreenHeight - 64)]; 44 [self.view addSubview:_mapView]; 45 _routesearch = [[BMKRouteSearch alloc] init]; 46 47 _mapView.delegate = self; 48 _routesearch.delegate = self; 49 50 _distanceLab = [[UILabel alloc] initWithFrame:CGRectMake(0, K_ScreenHeight - 64 - 40, K_ScreenWidth, 40)]; 51 _distanceLab.backgroundColor = [UIColor whiteColor]; 52 _distanceLab.textColor = [UIColor blueColor]; 53 [self.view addSubview:_distanceLab]; 54 55 56 // 计算两点之间直线距离 57 // CLLocationDistance distance = BMKMetersBetweenMapPoints(BMKMapPointMake(self.startCoor.latitude, self.startCoor.longitude), BMKMapPointMake(self.endCoor.latitude, self.endCoor.longitude)); 58 59 } 60 61 62 63 - (void)viewWillAppear:(BOOL)animated 64 { 65 [_mapView viewWillAppear]; 66 67 _mapView.delegate = self; 68 _routesearch.delegate = self; 69 70 [self driveSearchAction]; 71 } 72 73 - (void)viewWillDisappear:(BOOL)animated 74 { 75 76 [_mapView viewWillDisappear]; 77 _mapView.delegate = nil; 78 _routesearch.delegate = nil; 79 } 80 81 -(void)dealloc 82 { 83 if (_mapView != nil) { 84 _mapView = nil; 85 } 86 if (_routesearch != nil) { 87 _routesearch = nil; 88 } 89 } 90 91 92 - (void)driveSearchAction 93 { 94 // NSLog(@"1 ＝ %lf, %lf, %lf, %lf",self.startCoor.latitude, self.startCoor.longitude, self.endCoor.latitude, self.endCoor.longitude); 95 96 BMKPlanNode *start = [[BMKPlanNode alloc] init]; 97 start.pt = self.startCoor; 98 99 BMKPlanNode *end = [[BMKPlanNode alloc] init]; 100 end.pt = self.endCoor; 101 end.name = self.addrName; 102 103 BMKDrivingRoutePlanOption *drivingRoutePlanOption = [[BMKDrivingRoutePlanOption alloc] init]; 104 drivingRoutePlanOption.from = start; 105 drivingRoutePlanOption.to = end; 106 107 BOOL flag = [_routesearch drivingSearch:drivingRoutePlanOption]; 108 if (flag) { 109 NSLog(@"car检索发送成功"); 110 } else { 111 NSLog(@"car检索发送失败"); 112 } 113 } 114 115 116 #pragma mark - BMKMapViewDelegate 117 118 - (BMKAnnotationView *)mapView:(BMKMapView *)view viewForAnnotation:(id <BMKAnnotation>)annotation 119 { 120 if ([annotation isKindOfClass:[RouteAnnotation class]]) { 121 return [self getRouteAnnotationView:view viewForAnnotation:(RouteAnnotation*)annotation]; 122 } 123 return nil; 124 } 125 126 - (BMKOverlayView*)mapView:(BMKMapView *)map viewForOverlay:(id<BMKOverlay>)overlay 127 { 128 if ([overlay isKindOfClass:[BMKPolyline class]]) { 129 BMKPolylineView* polylineView = [[BMKPolylineView alloc] initWithOverlay:overlay]; 130 polylineView.fillColor = [[UIColor alloc] initWithRed:0 green:1 blue:1 alpha:1]; 131 polylineView.strokeColor = [[UIColor alloc] initWithRed:0 green:0 blue:1 alpha:0.7]; 132 polylineView.lineWidth = 3.0; 133 return polylineView; 134 } 135 return nil; 136 } 137 138 139 #pragma mark - BMKRouteSearchDelegate 140 141 - (void)onGetDrivingRouteResult:(BMKRouteSearch*)searcher result:(BMKDrivingRouteResult*)result errorCode:(BMKSearchErrorCode)error 142 { 143 NSArray* array = [NSArray arrayWithArray:_mapView.annotations]; 144 [_mapView removeAnnotations:array]; 145 array = [NSArray arrayWithArray:_mapView.overlays]; 146 [_mapView removeOverlays:array]; 147 148 if (error == BMK_SEARCH_NO_ERROR) { 149 BMKDrivingRouteLine* plan = (BMKDrivingRouteLine*)[result.routes objectAtIndex:0]; 150 _distanceLab.text = [NSString stringWithFormat:@"总路线：%.2lf公里", plan.distance * 2 / 1000.0]; 151 // 计算路线方案中的路段数目 152 NSInteger size = [plan.steps count]; 153 int planPointCounts = 0; 154 for (int i = 0; i < size; i++) { 155 BMKDrivingStep* transitStep = [plan.steps objectAtIndex:i]; 156 if(i==0){ 157 RouteAnnotation* item = [[RouteAnnotation alloc]init]; 158 item.coordinate = plan.starting.location; 159 item.title = @"起点"; 160 item.type = 0; 161 [_mapView addAnnotation:item]; // 添加起点标注 162 163 }else if(i==size-1){ 164 RouteAnnotation* item = [[RouteAnnotation alloc]init]; 165 item.coordinate = plan.terminal.location; 166 item.title = @"终点"; 167 item.type = 1; 168 [_mapView addAnnotation:item]; // 添加起点标注 169 } 170 //添加annotation节点 171 RouteAnnotation* item = [[RouteAnnotation alloc]init]; 172 item.coordinate = transitStep.entrace.location; 173 item.title = transitStep.entraceInstruction; 174 item.degree = transitStep.direction * 30; 175 item.type = 4; 176 [_mapView addAnnotation:item]; 177 178 //轨迹点总数累计 179 planPointCounts += transitStep.pointsCount; 180 } 181 // 添加途经点 182 if (plan.wayPoints) { 183 for (BMKPlanNode* tempNode in plan.wayPoints) { 184 RouteAnnotation* item = [[RouteAnnotation alloc]init]; 185 item = [[RouteAnnotation alloc]init]; 186 item.coordinate = tempNode.pt; 187 item.type = 5; 188 item.title = tempNode.name; 189 [_mapView addAnnotation:item]; 190 } 191 } 192 //轨迹点 193 BMKMapPoint * temppoints = new BMKMapPoint[planPointCounts]; 194 int i = 0; 195 for (int j = 0; j < size; j++) { 196 BMKDrivingStep* transitStep = [plan.steps objectAtIndex:j]; 197 int k=0; 198 for(k=0;k<transitStep.pointsCount;k++) { 199 temppoints[i].x = transitStep.points[k].x; 200 temppoints[i].y = transitStep.points[k].y; 201 i++; 202 } 203 204 } 205 // 通过points构建BMKPolyline 206 BMKPolyline* polyLine = [BMKPolyline polylineWithPoints:temppoints count:planPointCounts]; 207 [_mapView addOverlay:polyLine]; // 添加路线overlay 208 delete []temppoints; 209 [self mapViewFitPolyLine:polyLine]; 210 } 211 } 212 213 214 #pragma mark - 私有 215 - (NSString*)getMyBundlePath1:(NSString *)filename 216 { 217 NSBundle * libBundle = MYBUNDLE ; 218 if ( libBundle && filename ){ 219 NSString * s=[[libBundle resourcePath ] stringByAppendingPathComponent : filename]; 220 return s; 221 } 222 return nil ; 223 } 224 225 - (BMKAnnotationView*)getRouteAnnotationView:(BMKMapView *)mapview viewForAnnotation:(RouteAnnotation*)routeAnnotation 226 { 227 BMKAnnotationView* view = nil; 228 switch (routeAnnotation.type) { 229 case 0: 230 { 231 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"start_node"]; 232 if (view == nil) { 233 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"start_node"]; 234 view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_start.png"]]; 235 view.centerOffset = CGPointMake(0, -(view.frame.size.height * 0.5)); 236 view.canShowCallout = TRUE; 237 } 238 view.annotation = routeAnnotation; 239 } 240 break; 241 case 1: 242 { 243 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"end_node"]; 244 if (view == nil) { 245 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"end_node"]; 246 view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_end.png"]]; 247 view.centerOffset = CGPointMake(0, -(view.frame.size.height * 0.5)); 248 view.canShowCallout = TRUE; 249 } 250 view.annotation = routeAnnotation; 251 } 252 break; 253 case 2: 254 { 255 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"bus_node"]; 256 if (view == nil) { 257 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"bus_node"]; 258 view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_bus.png"]]; 259 view.canShowCallout = TRUE; 260 } 261 view.annotation = routeAnnotation; 262 } 263 break; 264 case 3: 265 { 266 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"rail_node"]; 267 if (view == nil) { 268 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"rail_node"]; 269 view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_rail.png"]]; 270 view.canShowCallout = TRUE; 271 } 272 view.annotation = routeAnnotation; 273 } 274 break; 275 case 4: 276 { 277 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"route_node"]; 278 if (view == nil) { 279 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"route_node"]; 280 view.canShowCallout = TRUE; 281 } else { 282 [view setNeedsDisplay]; 283 } 284 285 UIImage* image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_direction.png"]]; 286 view.image = [image imageRotatedByDegrees:routeAnnotation.degree]; 287 view.annotation = routeAnnotation; 288 289 } 290 break; 291 case 5: 292 { 293 view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"waypoint_node"]; 294 if (view == nil) { 295 view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"waypoint_node"]; 296 view.canShowCallout = TRUE; 297 } else { 298 [view setNeedsDisplay]; 299 } 300 301 UIImage* image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_waypoint.png"]]; 302 view.image = [image imageRotatedByDegrees:routeAnnotation.degree]; 303 view.annotation = routeAnnotation; 304 } 305 break; 306 default: 307 break; 308 } 309 310 return view; 311 } 312 313 314 //根据polyline设置地图范围 315 - (void)mapViewFitPolyLine:(BMKPolyline *) polyLine { 316 CGFloat ltX, ltY, rbX, rbY; 317 if (polyLine.pointCount < 1) { 318 return; 319 } 320 BMKMapPoint pt = polyLine.points[0]; 321 ltX = pt.x, ltY = pt.y; 322 rbX = pt.x, rbY = pt.y; 323 for (int i = 1; i < polyLine.pointCount; i++) { 324 BMKMapPoint pt = polyLine.points[i]; 325 if (pt.x < ltX) { 326 ltX = pt.x; 327 } 328 if (pt.x > rbX) { 329 rbX = pt.x; 330 } 331 if (pt.y > ltY) { 332 ltY = pt.y; 333 } 334 if (pt.y < rbY) { 335 rbY = pt.y; 336 } 337 } 338 BMKMapRect rect; 339 rect.origin = BMKMapPointMake(ltX , ltY); 340 rect.size = BMKMapSizeMake(rbX - ltX, rbY - ltY); 341 [_mapView setVisibleMapRect:rect]; 342 _mapView.zoomLevel = _mapView.zoomLevel - 0.3; 343 } 344 @end
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