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Bug Report T302395
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Custom MapDataProvider does not work correctly with custom tile size

created 9 years ago

[DevExpress Support Team: CLONED FROM T301866: Custom MapDataProvider does not work correctly with a custom tile size]
Hello!

We are using MapControl   for displaying raster and vector non-cartographical images. Our data has specific features:
 - We don't have an infinite map. Our image has finite sizes and it can be not square
 - Tiles can be not square

We have created a sample illustrating our questions (attachement). The sample works with 3 kinds ot input data:
  Input Data 1.  Tiles of size 256x256
  Input Data 2.  Tiles 100x100
 Input Data 3.  Tiles 70x70
All data has 2 levels of zoom (1,2).
Our real image that we have is of orange color . We fill emty space with white color while generating tiles to adjust tile sizes.

Here is the list of issues we'd like to clarify:

Issue3.  If the tile size is less than 256x256 (for example 100x100 - input data 2) some artifacts - white lines - appear between the tiles. Is there a way to avoid these artifacts?

Issue 4. MapControl stretches non-square tiles to make it square (input data 3). How can we use non-square tiles in MapControl?

Comments (1)
DevExpress Support Team 9 years ago

    I have managed to reproduce the described problem on my side. It will require some time to research it in greater detail. I have passed this issue to our developers for further research. We will update the thread once we have any results.

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    Answers approved by DevExpress Support

    created 9 years ago

    We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.

    Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.

      Show previous comments (8)
      MI MI
      Marina Ivanova 1 9 years ago

        Talking about v14.1 the problem with non-square tiles is fixed. But I tried the trial version of hotfix 15.1, cause we are going to accept it. There it doesn't work. I attached the screencast http://screencast.com/t/PJTXq3cZEKYW
        Moreover, what about Issue 3 in the question https://www.devexpress.com/Support/Center/Question/Details/T301866 . These artifacts still apear in both hotfixes (14.1 and 15.1).

        DevExpress Support Team 9 years ago

          We have researched the issue and decided that it is better to discuss this issue in a separate thread. I have registered a separate bug regarding this issue and we will reply to you there ASAP: T309724: If Custom MapDataProvider with a custom tile size is used, tiny white lines appear around the tile at certain zoom levels

          DevExpress Support Team 9 years ago

            To convert the provided sample to version 15.1, do the following:

            1. In the LocalDataProvider class, replace the "IProjection Projection" property with a new "ProjectionBase Projection" property.
            2. In the LocalDataProvider class, define the BaseSizeInPixels property as shown below:
            C#
            protected override Size BaseSizeInPixels  
{  
    get { return new Size(_tileWidth * 2, _tileHeight * 2); }  
}
            1. On changing ImageTilesLayer in the map control, also define the MapControl.InitialMapSize Property.
            C#
            mapControl.InitialMapSize = new System.Drawing.Size(tileWidth * 2, tileHeight * 2);

            I have created a sample project that demonstrates this approach. You will find it in the attachment.

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