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How to save an IMap (or IGraphicsContainer) as an Image (such as: jpg, png...) ?

TaiBui

Hi,

I am having an IMap (AxPageLayoutControl.ActiveView.FocusMap) that includes some elements (Text, lines,...)

And, I want to create an Image (such as: jpg, png) that show all objects of the IMap (using C#, Visual Studio).

Do you know how to do that ?

Thanks and regards,

Tai

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Accepted answers

TaiBui

how do you figure the screen resolution?

Hi Xtian79,

I found out another way, please see the link: http://forums.arcgis.com/threads/69207-How-to-store-elements-of-IMap%28IGraphicsContainer%29-as-BinaryData-format-in-SQL?p=245080&viewfull=1#post245080

Kind regards,

All comments

Cristian_Galindo

Hi, basically one way is to draw layer by layer in an image object, then export it

                private static IDisplay myDisplay;
                private static Image myMapImage;

                Graphics g = Graphics.FromImage(myMapImage);
                g.Clear(Color.Transparent);
                myDisplay.StartDrawing(g.GetHdc().ToInt32(), 0);

                for (int i = Map.LayerCount - 1; i >= 0; i--)
                {
                    ILayer layer = MapControl.get_Layer(i);
                    layer.Draw(esriDrawPhase.esriDPGeography, myDisplay, null);
                }

                myDisplay.FinishDrawing();
                g.ReleaseHdc();

I hope this is helpful for you

TaiBui

Hi, basically one way is to draw layer by layer in an image object, then export it

                private static IDisplay myDisplay;
                private static Image myMapImage;

                Graphics g = Graphics.FromImage(myMapImage);
                g.Clear(Color.Transparent);
                myDisplay.StartDrawing(g.GetHdc().ToInt32(), 0);

                for (int i = Map.LayerCount - 1; i >= 0; i--)
                {
                    ILayer layer = MapControl.get_Layer(i);
                    layer.Draw(esriDrawPhase.esriDPGeography, myDisplay, null);
                }

                myDisplay.FinishDrawing();
                g.ReleaseHdc();

I hope this is helpful for you

Thank you. But there is an error: Use of unassigned local variable 'myMapImage'
Kind regards,
Tai

TaiBui

I am thinking about converting elements of IMap into RasterDataset (in geodatabase). Then, export RasterDataset into Image. But I haven't known how to do that. Are there anyone can help ?

Please see my below screenshot:

[ATTACH=CONFIG]18127[/ATTACH]

image.png

Cristian_Galindo

Thank you. But there is an error: Use of unassigned local variable 'myMapImage'
Kind regards,
Tai

you are rigth, that's my mistake, you have to initialize the variable....

TaiBui

you are rigth, that's my mistake, you have to initialize the variable....

Could you please tell me how to do that ?

TaiBui

Hi,

After searching on the internet. I found the solution for this and used the below codes to export IMap to image:

private void SaveImapAsJpg(IMap map, string filePath)
        {
            IExport pExport = new ExportJPEGClass();
            IActiveView activeView = map as IActiveView;
            pExport.ExportFileName = filePath;

            pExport.Resolution = 100;
            tagRECT exportRect = activeView .ExportFrame ;
            IEnvelope pPixelBoundsEnv = new EnvelopeClass();
            pPixelBoundsEnv.PutCoords(exportRECT.left, exportRECT.bottom, exportRECT.right, exportRECT.top);

            pExport.PixelBounds = pPixelBoundsEnv;

            int hDC;
            hDC = pExport.StartExporting();
            activeView.Output(hDC, (int)pExport.Resolution, ref exportRECT, activeView.FullExtent, null);
            pExport.FinishExporting();
            pExport.Cleanup();
        }

Please see the result in image1

But the Image is not same as IMap. When I replace the italic codes by below codes, the image is good (I am not sure why ?):

            System.Int32 screenResolution = 30;
            System.Int32 outputResolution = 200;

            pExport.Resolution = outputResolution;

            ESRI.ArcGIS.Display.tagRECT exportRECT;
            exportRECT.left = 0;
            exportRECT.top = 0;
            exportRECT.right = activeView.ExportFrame.right * (outputResolution / screenResolution);
            exportRECT.bottom = activeView.ExportFrame.bottom * (outputResolution / screenResolution);
Please see the result in image2

[ATTACH=CONFIG]18181[/ATTACH]
[ATTACH=CONFIG]18182[/ATTACH]

image2.jpg

image1.jpg

Cristian_Galindo

hi,

System.Int32 screenResolution = 30;
            System.Int32 outputResolution = 200;

            pExport.Resolution = outputResolution;

            ESRI.ArcGIS.Display.tagRECT exportRECT;
            exportRECT.left = 0;
            exportRECT.top = 0;
            exportRECT.right = activeView.ExportFrame.right * (outputResolution / screenResolution);
            exportRECT.bottom = activeView.ExportFrame.bottom * (outputResolution / screenResolution);

how do you figure the screen resolution?

TaiBui

how do you figure the screen resolution?

Cristian_Galindo

Hi Xtian79,

I found out another way, please see the link: http://forums.arcgis.com/threads/69207-How-to-store-elements-of-IMap%28IGraphicsContainer%29-as-BinaryData-format-in-SQL?p=245080&viewfull=1#post245080

Kind regards,

Hi!!!,

in the solution that you propose how do you figure the value of the screen resolution?, or is it just a random value? i trying to export an image to the printer, that information would be useful

TaiBui

Hi!!!,

in the solution that you propose how do you figure the value of the screen resolution?, or is it just a random value? i trying to export an image to the printer, that information would be useful

Hi,

You can see below examples for detail:

http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Create_JPEG_hi_resolution_from_ActiveView_Snippet/0049000000nv000000/

http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Create_JPEG_from_ActiveView_Snippet/004900000064000000/

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