判断地图坐标是否在区域内

最新推荐文章于 2023-04-27 21:17:17 发布

最新推荐文章于 2023-04-27 21:17:17 发布 · 501 阅读

本文介绍了一种在地图应用中实现点击检测的方法，通过将用户的触摸位置转换为地图坐标，并判断该坐标是否位于预设的多边形覆盖区域内。利用MKPolygonView和CGPathContainsPoint等API来确定触摸点是否在覆盖范围内。

-(IBAction)foundTap:(UITapGestureRecognizer *)recognizer
{
  CGPoint point = [recognizer locationInView:self.mapView];

  CLLocationCoordinate2D tapPoint = [self.mapView convertPoint:point toCoordinateFromView:self.view];

  [self pointInsideOverlay:tapPoint];

  if (isInside) 
  {
   ....
  }
}

Here is a method to call from the previous to check if the point is inside the overlay:

-(void)pointInsideOverlay:(CLLocationCoordinate2D )tapPoint 
{
  isInside = FALSE; 

  MKPolygonView *polygonView = (MKPolygonView *)[mapView viewForOverlay:polygonOverlay];

  MKMapPoint mapPoint = MKMapPointForCoordinate(tapPoint);

  CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];

  BOOL mapCoordinateIsInPolygon = CGPathContainsPoint(polygonView.path, NULL, polygonViewPoint, NO);

    if ( !mapCoordinateIsInPolygon )

      //we are finding points that are inside the overlay
    {
      isInside = TRUE;
    }
}