OnRenderTargetChanged

[blar58]

Can I use the pattern of disposing and reinitializing in OnRenderTargetChanged() for TextFormat and StrokeStyleProperties.

SharpDX.DirectWrite.TextFormat textFormat = new SharpDX.DirectWrite.TextFormat(Core.Globals.DirectWriteFactory, txtFont.Family.ToString(), SharpDX.DirectWrite.FontWeight.Bold,
														SharpDX.DirectWrite.FontStyle.Normal, SharpDX.DirectWrite.FontStretch.Normal, 16);

SharpDX.Direct2D1.StrokeStyleProperties ssProps = new SharpDX.Direct2D1.StrokeStyleProperties();
ssProps.DashStyle = dashStyle;
SharpDX.Direct2D1.StrokeStyle myStyle = new SharpDX.Direct2D1.StrokeStyle(helper.renderTarget.Factory, ssProps);

If yes what would it look like

Thank you

[NinjaTrader_Jim]

Hello blar58,

Thanks for opening the thread.

Device dependent resources will need to be disposed of in OnRenderTargetChanged() so the resources can be freed with each render target change. SharpDX Brushes are an example of a device dependent resource.

Device independent resources would not need to be disposed of inside OnRenderTargetChanged(). As SharpDX.DirectWrite.TextFormat and SharpDX.Direct2D1.StrokeStyle are considered device independent, you would not need to dispose of these objects with each render target change.

SharpDX.Direct2D1.StrokeStyleProperties does not inherit an IDisposable property, so it would not be able to be disposed of.

It is recommended to dispose of all objects that inherit an IDisposable property, but you only need to worry about the device dependent resources getting disposed and recreated in OnRenderTargetChanged().

You can reference the SampleCustomRender indicator to see how TextFormats can be disposed of in OnRender(). As this is a device-indpendent resource, it could be disposed of in State.Terminated instead.

You may reference the links below for further reading and usage.

DisposeBase (Disposable objects) - https://ninjatrader.com/support/help...isposebase.htm

OnRenderTargetChanged (only device dependent resources need to be disposed of here) - https://ninjatrader.com/support/help...getchanged.htm

DirectWrite (device independent) - https://msdn.microsoft.com/en-us/lib.../dd368038.aspx

StrokeStyle (device independent) - https://ninjatrader.com/support/help...trokestyle.htm

StrokeStyleProperties (does not inherit IDisposable) - https://ninjatrader.com/support/help...properties.htm

EDIT: The best practices link here covers what is device dependent and independent - https://ninjatrader.com/support/help...arpDXResources

Please let me know if I may be of further assistance.

[blar58]

Thanks for your answer Jim

I have a question though.
I looked at the sampleCustomRender indicator and I am wondering if creating a new SimpleFont in OnRender() each time the chart updates would that not be resource intensive instead of creating the SimpleFont only once ?

[blar58]

Jim

Just discard my last reply.

I figured out what to do

Thanks