Silverlight export image to PNG

[BlueMonkey]

How can I export the TChart image to a file such as PNG in Silverlight?

I tried the code shown, but no file is produced. Is there sample code somewhere that I have not found?

Thanks,
Kent

Code: Select all

        private void buttonCopy_Click(object sender, RoutedEventArgs e)
        {
            //Stream myStream;
            string fileName;

            SaveFileDialog saveDialog = new SaveFileDialog();
            try
            {
                fileName = string.Format("Chart Image {0}", string.Format("{0:yyyy-MMM-dd}", DateTime.Now));
                //saveDialog.SafeFileName = fileName;

                saveDialog.DefaultExt = "png";
                saveDialog.Filter = "Chart image file (*.png)|*.png";
                saveDialog.FilterIndex = 1;
                //               saveDialog.Title = "Export Chart Data";

                if (saveDialog.ShowDialog() == true)
                {
                    FChartTimeSeries.ChartDisplay.Export.Image.PNG.Save(saveDialog.SafeFileName);
                    //FChartTimeSeries.ChartDisplay.Export.Image.PNG.Save(myStream);
                    //using (Stream stream = saveDialog.OpenFile())
                    //{
                    //    using (StreamWriter writer = new StreamWriter(stream))
                    //    {
                    //        writer.Write(myStream);
                    //    }
                    //}
                }
            }
            catch
            {
            }

[Sandra]

Hello Kent,

I made a simple example that works fine here with next maintenance release of TeeChartSilverlight and I think you can use similar code in your application for save image .png:

Code: Select all

 private Steema.TeeChart.Silverlight.Styles.Line line1;
       
        public void InitializeChart()
        {
             line1 = new Steema.TeeChart.Silverlight.Styles.Line(tChart1.Chart);
            line1.FillSampleValues();
         
        }
    
        void button1_Click(object sender, RoutedEventArgs e)
        {
            tChart1.Export.Image.PNG.Save("");

        } 

Could you please check if previous code works as you want?

I hope will helps.

Thanks,

[BlueMonkey]

Hi Sandra,

I will try it when the next release comes out. I am curious where the file will go, since Silverlight restrict exports to a folder that the user specifies, and the file name returned from the Save Dialog does not contain a folder name. In order to save ordinary files it is necessary to use the SaveDialog.OpenFile() method to directly open the file specified. Passing a complete file/path name to a different object's save method does not usually work.

Your example does not use the Save Dialog and passes an empty file name to the export method, so I don't know if that is required and if TeeChart supplies a name in this case. I would like for the user to be allowed to supply the file name.

I guess I will find all this out when I get the next maintenance release.

Thanks,
Kent

[Sandra]

Hello BlueMonkey,


Sorry for the delayed reply. I have tested your problem with Silverlight dialog and I inform that you can have two ways for save PNG image with TeeChartSilverlight.

First, you could save image with property tChart1.Export.Image.PNG.UseIsolatedStorage=true, it save your image in a hidden folder of the system where extensively explain in this link , if you are interest in it, you could use similar code as next:

Code: Select all

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            using (System.IO.IsolatedStorage.IsolatedStorageFile iso = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
             {
                 iso.IncreaseQuotaTo(50000000);
                }
    
                tChart1.Export.Image.PNG.UseIsolatedStorage = true;
                tChart1.Export.Image.PNG.Save("tmp.png");
        }

Second way, that I think more interesting for you, is saving an image with a dialog that TeeChartSilverlight it gives you.
It is a solution that I have proposes previously, but I think that I didn’t explain well. Using it you could save your image with name that you provide, you can a code as next:

Code: Select all

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Steema.TeeChart.Silverlight.Export.PNGFormat png = tChart1.Export.Image.PNG;
            png.UseIsolatedStorage = false;
            png.Save("");
        }

Also notice that it's useless saving an image providing a file name. Save method will open a save file dialog and will create an image with the file name given in the dialog. That's why file name is empty in my examples.