Hi,

I have written a custom event in my indicator code. As part of this event, I need to repaint the various graphic objects drawn on the visible part of the chart, which I do via Refresh(). The repaint needs to be done regardless of whether the chart is connected to data from a provider.

Unfortunately, the chart is not being repainted. I believe the custom event is firing but is being consumed by the form. I can access the window of the chart and attach to its Paint event but this still does not work as there does not seem to be an equivalent to KeyPreview that relates to paint events.

This is unsupported by Ninja, but can someone please point me in the right direction so that I can achieve a chart repaint based on a custom paint event even when disconnected form a data provider? Any suggestions would be greatly appreciated. Thanks.

Zeos6 

Hi, I have written a custom event in my indicator code. As part of this event, I need to repaint the various graphic objects drawn on the visible part of the chart, which I do via Refresh(). The repaint needs to be done regardless of whether the chart is connected to data from a provider. Unfortunately, the chart is not being repainted. I believe the custom event is firing but is being consumed by the form. I can access the window of the chart and attach to its Paint event but this still does not work as there does not seem to be an equivalent to KeyPreview that relates to paint events. This is unsupported by Ninja, but can someone please point me in the right direction so that I can achieve a chart repaint based on a custom paint event even when disconnected form a data provider? Any suggestions would be greatly appreciated. Thanks.

as long as you know how many bar ago you can repaint it
https://ninjatrader.com/support/helpGuides/nt7/index.html?barcolorseries.htm

Thank you for the response but the reply misses the point of my question entirely. Perhaps it is the way I have written it. I simply need a way to fire a custom paint event when there is no incoming data, and the data feed is disconnected.

Zeos6 

Thank you for the response but the reply misses the point of my question entirely. Perhaps it is the way I have written it. I simply need a way to fire a custom paint event when there is no incoming data, and the data feed is disconnected.

If you do plot override this method is fired every time something is drawn on the chart (eg. new bar, scrolling left or right, zoom in and out, etc.).

Take a look at g3ChartSpan where this is utilised in the simplest way.

In some circumstances you may also find the following useful:

 

Code

this.ChartControl.ChartPanel.Invalidate(); this.ChartControl.ChartPanel.Update();

Thank you. I generally tend to use this.ChartControl.Refresh() to get an immediate redraw.

gregid 

If you do plot override this method is fired every time something is drawn on the chart (eg. new bar, scrolling left or right, zoom in and out, etc.). Take a look at g3ChartSpan where this is utilised in the simplest way.

Thank you. I had a look at the indicator (very nice), and it seems to have the behaviour I need. I need to fire this paint draw from a custom event, so I will work with this approach and see how it goes. Thank you.