// Two points in rectangular co-ordinate system create a rectange
static EastSouthDistance FetchRect(MKMapPoint fromAnchorMKPoint, MKMapPoint toPoint)
{
double latitude = MKMapPoint.ToCoordinate(fromAnchorMKPoint).Latitude;
nfloat metersPerMapPoint = (nfloat)MKGeometry.MetersPerMapPointAtLatitude(latitude);
var eastSouthDistance = new EastSouthDistance {
East = (nfloat)(toPoint.X - fromAnchorMKPoint.X) * metersPerMapPoint,
South = (nfloat)(toPoint.Y - fromAnchorMKPoint.Y) * metersPerMapPoint
};
return(eastSouthDistance);
}
// Convert the specified geographic coordinate to floorplan point
public CGPoint Convert(CLLocationCoordinate2D coordinate)
{
// Get the distance east & south with respect to the first anchor point in meters
EastSouthDistance rect = FetchRect(fromAnchorMKPoint, MKMapPoint.FromCoordinate(coordinate));
// Convert the east-south anchor point distance to pixels (still in east-south)
var scaleTransform = CGAffineTransform.MakeScale(PixelsPerMeter, PixelsPerMeter);
CGPoint pixelsXYInEastSouth = scaleTransform.TransformPoint(new CGPoint(rect.East, rect.South));
// Rotate the east-south distance to be relative to floorplan horizontal
// This gives us an xy distance in pixels from the anchor point.
var rotateTransform = CGAffineTransform.MakeRotation(radiansRotated);
CGPoint xy = rotateTransform.TransformPoint(pixelsXYInEastSouth);
// From Anchor point may not be top letf corner.
// however, we need the pixels from the (0, 0) of the floorplan
// so we adjust by the position of the anchor point in the floorplan
xy.X += fromAnchorFloorplanPoint.X;
xy.Y += fromAnchorFloorplanPoint.Y;
return(xy);
}
// Two points in rectangular co-ordinate system create a rectange
static EastSouthDistance FetchRect (MKMapPoint fromAnchorMKPoint, MKMapPoint toPoint)
{
double latitude = MKMapPoint.ToCoordinate (fromAnchorMKPoint).Latitude;
nfloat metersPerMapPoint = (nfloat)MKGeometry.MetersPerMapPointAtLatitude (latitude);
var eastSouthDistance = new EastSouthDistance {
East = (nfloat)(toPoint.X - fromAnchorMKPoint.X) * metersPerMapPoint,
South = (nfloat)(toPoint.Y - fromAnchorMKPoint.Y) * metersPerMapPoint
};
return eastSouthDistance;
}
