Zooming

[Miirek]

Hi,

how can I zoom to display all my annotation/whole polygon - I'm missing [mapView regionThatFits] method. Is there any other way to do it?

Thanks for answer.

M.

[Thallius]

Create a MKMapRect with the minimum and maximum values of your annotations.
After that make a MKCoordinateRegion from this Rect and use setRegion

MKMapRect regionMapRect;
regionMapRect.origin.x=0;
regionMapRect.origin.y=0;
regionMapRect.size.width=0;
regionMapRect.size.height=0;

while()
{
    point=annotation coordinates

    if(regionMapRect.size.width==0)
    {
        // 2000 and 4000 is the zoom I want if only one annotation is visible. Use what you like
        regionMapRect.origin.x=point.x-2000;
        regionMapRect.origin.y=point.y-2000;
        regionMapRect.size.width=4000;
        regionMapRect.size.height=4000;
    }
    else
    {
        if(point.x<regionMapRect.origin.x)
            regionMapRect.origin.x=point.x;
        if(point.y<regionMapRect.origin.y)
            regionMapRect.origin.y=point.y;
        if(point.x>regionMapRect.origin.x+regionMapRect.size.width)
            regionMapRect.size.width=point.x-regionMapRect.origin.x;
        if(point.y>regionMapRect.origin.y+regionMapRect.size.height)
            regionMapRect.size.height=point.y-regionMapRect.origin.y;
    }
}

regionMapRect.size.width *= 1.2;
regionMapRect.size.height *= 1.2;

MKCoordinateRegion coordinateRegion = MKCoordinateRegionForMapRect(regionMapRect);
[mapView setRegion:coordinateRegion animated:NO];

// Setting the center again will have a better result for me

[mapView setCenterCoordinate:CLLocationCoordinate2DMake((minlat+(maxlat-minlat)/2), (minlon+(maxlon-minlon)/2))];

Regards

Claus

[valikb]

Hi Claus,

I can see you've selected:
[mapView setRegion:coordinateRegion animated:NO]

Have you also noticed that zoom doesn't work when choose "animated:YES"?
Are there any chances to make it work?