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Polygon rotation

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Yan Moura asked on 30 Sep 2011, 06:42 PM

Hello!

I am writing a SL version of an existing Flash application, whose goal is to help our employees to locate car bodies in our junkyard (we have over 1000 carcass).

Each car will be represented in the map by a rectangle (four sides polygon), and to get the actual position of each car in the yard, one of our employee captured the exact location of each one with a GPS (where the coordinate means the center axis of the car).

However, depending on the place in the junkyard, the front of the car may be pointing to a different direction.

So my question is: how to rotate a polygon? There is a method where I can enter a radian as parameter to make it rotate?

Thanks!

15 Answers, 1 is accepted

answered on 05 Oct 2011, 02:21 PM

RotatePinPoint.zip

Hi Yan Moura,

Please, find attached sample solution which demonstrates how the geographically positioned polygon can be rotated.

Greetings,

Andrey Murzov

the Telerik team

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answered on 13 Oct 2011, 09:33 PM

Andrey,

Could you please give me a clue about how to control the created objects such as change its rotation or coordinate on-the-fly?

I have created a function that allows to change the rotation of the object on-the-fly by locating the object in the ObservableCollection, then saving its properties, removing the object and then recreating it with the new desired rotation.

Basically this method can be used to update any characteristic in the object, but in my opinion it has a lot of code. My question is if there is an easier and more straightforward way to do that such as just changing the desired property value?

My current code looks like this:

private void RotateObject(string id, double new_angle)
{
    // 'Objects' is the InformationLayer binded ItemsSource

    int zz;
    for (zz = 0; zz <= this.ObjObservableCollection.Objects.Count - 1; zz++)
        if (this.ObjObservableCollection.Objects[zz].ID == id)
        {
            // save existing data
            Location loc = this.ObjObservableCollection.Objects[zz].Location;
            string id = this.ObjObservableCollection.Objects[zz].ID;
            LocationRect mycb = new LocationRect(new Location(north, west), new Location(north, west));
            Color color = this.ObjObservableCollection.Objects[zz].Color;
            double north = ObjObservableCollection.Objects[zz].North;
            double west = ObjObservableCollection.Objects[zz].West;

            // remove the old object
            this.ObjObservableCollection.Objects.RemoveAt(zz);

            // recreate the object with the new rotation angle
        this.MyInformationLayer.RegionMode = RegionSizeMode.Dynamic;
            this.MyInformationLayer.Region = rect;

            Location loc = new Location(north,west);
        CustomObject obj = new CustomObject()
        {
                ID = id,
       Location = loc,
       Fill = new SolidColorBrush(color),
                Color = color,
                North = north,
                West = west,
                RotationAngle = new_angle,
        };

            this.ObjObservableCollection.Objects.Add(obj);
            break;
        }
}

However I was thinking if something like THIS could be done (I tried this and it didn't work):

private void RotateObject(string id, double new_angle)
{
    // 'Objects' is the InformationLayer binded ItemsSource

    int zz;
    for (zz = 0; zz <= this.ObjObservableCollection.Objects.Count - 1; zz++)
        if (this.ObjObservableCollection.Objects[zz].ID == id)
        {
            this.ObjObservableCollection.Objects[zz].RotationAngle = new_angle;
            break;
        }
}

Thanks!

answered on 22 Nov 2011, 03:11 PM

Hi Andrey,

Boomer!

It really would be too much more productive if polygons could be expanded and treated as independent objects within the Information Layer. It would allow you to rotate, resize, move, paint, etc, each one of them! :)

I am currently remaking a complex application that make extensive use of geographical polygons. Originally this app was done in Flash, that makes this kind of project a breeze. For instances, with Flash to rotate an existing polygon, it is just to change its angle property; but with the RadMap components -- that so far is the best approach I have to do similar stuff in SL -- I have to remove the polygon and then recreate it after to calculate each rotated point with trig functions. OK, it works, but it could be easier! ;)

Anyway, I hope that in a near future, Telerik consider to restructure the way as Map polygons are manipulated! :)

Thanks,

Yan