我有一个KML文件,其中包含所有国家/地区的所有多边形坐标。有些国家有超过 1 个<coordinates>
标签。我在这里要完成的是获取坐标并找到多边形所在的位置。我对这篇文章有一个想法,但我的问题是我的算法是错误的,并返回我的坐标位于超过 1 个多边形上。这是我的代码:
-(void)parseCoordinates:(NSString*)str{
coordinatesArray = [str componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSInteger coordinatesCount = [coordinatesArray count];
CLLocationCoordinate2D *cord2d = malloc(sizeof(CLLocationCoordinate2D) * coordinatesCount);
for(int i=0; i<coordinatesCount;i++){
NSString *st = [coordinatesArray objectAtIndex:i];
if ([st isEqualToString:@""]) {
continue;
}
NSArray *strArray = [st componentsSeparatedByString:@","];
if ([strArray count]>1) {
cord2d[i] = CLLocationCoordinate2DMake([[strArray objectAtIndex:1] doubleValue], [[strArray objectAtIndex:0] doubleValue]);
}
strArray=nil;
}
free(cord2d);
coordinatesArray = nil;
MKPolygon* poly2 = [MKPolygon polygonWithCoordinates:cord2d count:coordinatesCount];
CLLocationCoordinate2D mapCoordinate = CLLocationCoordinate2DMake(39.1274378,-100.9945566);
MKMapPoint mapPoint = MKMapPointForCoordinate(mapCoordinate);
MKPolygonRenderer *polygonView = [[MKPolygonRenderer alloc]initWithPolygon:poly2];
CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];
BOOL mapCoordinateIsInPolygon =
CGPathContainsPoint(polygonView.path, NULL, polygonViewPoint, NO);
NSLog(@"Country: %@", country);
NSLog(@"is it inside? %d",mapCoordinateIsInPolygon);
}