Why can't draw in other tab chart ?

[franjcy]

Hi!

I'm trying to iterate through all charts within a window (it has tabs), draw a text when I change the tab and then save to an .png image.

The problem is only drawing in the indicator window, not on the others.

Also, I want to obtain the timeframe of every tab and use it on filename image.

My actual code:

...
private NinjaTrader.Gui.Chart.Chart chart;
...

private void CaptureAllCharts()
{​
ChartControl.Dispatcher.InvokeAsync(async () =>
{
     var chartWindow = Window.GetWindow(ChartControl.Parent) as Chart;
     var chartControl = chartWindow.ActiveChartControl;
     int i = 0;
     var tabs = chartWindow.MainTabControl.Items;
     if (tabs == null || tabs.Count == 0) return;

     int tabActual = chartWindow.MainTabControl.SelectedIndex;
     string safeDateTime;
     foreach (TabItem tab in chartWindow.MainTabControl.Items)
     {
     safeDateTime = DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss");
     chartWindow.MainTabControl.SelectedIndex = i;

     await Task.Delay(1000);
     chartControl = chartWindow.ActiveChartControl; //no necesario??
     Draw.TextFixed(this, safeDateTime + i, BarsPeriod.Value.ToString() + "_" + BarsPeriod.BarsPeriodType, TextPosition.BottomLeft);
     chartControl.InvalidateVisual();
     CaptureChartImage(chartControl, i, BarsPeriod.Value.ToString(), BarsPeriod.BarsPeriodType.ToString());
     RemoveDrawObject(safeDateTime + i);
     i++;

}
     chartWindow.MainTabControl.SelectedIndex = tabActual;
});​
}



private void CaptureChartImage(ChartControl chartControl, int i, string barsValue, string barsPeriodType)
{
if (chartControl != null) {

string path = Core.Globals.UserDataDir + "SavedImages\\";
chart = Window.GetWindow(chartControl) as Chart;

if (chart != null)
{
try
{
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}

RenderTargetBitmap screenCapture = chart.GetScreenshot(ShareScreenshotType.Chart);
BitmapFrame outputFrame = BitmapFrame.Create(screenCapture);
if (screenCapture != null)
{
PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(outputFrame);
string safeDateTime = DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss");
string fileName = Instrument.FullName + "_" + BarsPeriod.Value + "_" + barsPeriodType + "_" + safeDateTime + "_" + i;
fileName = fileName.Replace('/', '_').Replace('\\', '_').Replace(':', '_').Replace(' ', '_');

string filePath = Path.Combine(path, fileName + ".png");

using (Stream stream = File.Create(filePath))
{
png.Save(stream);
}

Print("Captura guardada: " + filePath);
}
}
catch (Exception ex)
{
Print("Error al guardar la captura: " + ex.Message);
}
}

}
}​

[NinjaTrader_Jesse]

Hello franjcy,

Drawing in other tabs from a single script is not supported, you would need to apply the script to that tab to draw in that tab.

One note on the code you provided it is using the async/await pattern which is not supported, I would suggest to avoid that type of use in NinjaScript.

[franjcy]

Hello franjcy,

Drawing in other tabs from a single script is not supported, you would need to apply the script to that tab to draw in that tab.

One note on the code you provided it is using the async/await pattern which is not supported, I would suggest to avoid that type of use in NinjaScript.

So If i can't draw in other tabs, what can i do to draw the timeframe on saved .png and thus differentiate them? The function "chartWindow.SaveChartImage()" with it contextual menú does save the timeframe.

[NinjaTrader_Jesse]

Hello franjcy,

The method you mentioned only saves an image, there is not anything in NinjaScript which can be used to edit that image in any way. That is not a documented/supported method so it is limited to the use it has. While you can save images with that you would have to come up with your own logic for naming or defining what is in the image if you needed that information at a later time.

You could use the first sample from this post: https://forum.ninjatrader.com/forum/...are#post717865

That shows an alternate unsupported method which can be used but that allows you to save it with a specific name so you could include any details in the filename that you wanted.

[franjcy]

Hello franjcy,

The method you mentioned only saves an image, there is not anything in NinjaScript which can be used to edit that image in any way. That is not a documented/supported method so it is limited to the use it has. While you can save images with that you would have to come up with your own logic for naming or defining what is in the image if you needed that information at a later time.

You could use the first sample from this post: https://forum.ninjatrader.com/forum/...are#post717865

That shows an alternate unsupported method which can be used but that allows you to save it with a specific name so you could include any details in the filename that you wanted.

Thanks Jessy, I'll try with it.

[franjcy]

Hello franjcy,

The method you mentioned only saves an image, there is not anything in NinjaScript which can be used to edit that image in any way. That is not a documented/supported method so it is limited to the use it has. While you can save images with that you would have to come up with your own logic for naming or defining what is in the image if you needed that information at a later time.

You could use the first sample from this post: https://forum.ninjatrader.com/forum/...are#post717865

That shows an alternate unsupported method which can be used but that allows you to save it with a specific name so you could include any details in the filename that you wanted.

Sorry, last question.

You said "chartWindow.SaveChartImage()" is a function undocumented. Isn't that funcion that it's executed when right click on chart Save Chart Image?? That image does save the timeframe on image saved.

[NinjaTrader_Jesse]

Hello franjcy,

I am not sure because that is not documented, we have no way to look at the internals of the platform and the methods the menu actions use.