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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

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/

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

how do you figure the screen resolution?

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

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

TaiBui

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

Could you please tell me how to do that ?

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

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

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

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

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