Problem in rendering DrawLine/DrawRectangle

[silacitrader]

Hi, I am working on a simple indicator which plots certain levels using DrawLine and DrawRectangle based on a static input I provide through a file.

The DrawLine and DrawRectangle span over the whole calendar day, so I'm using as endTime = startTime.AddDays(1); for the line/rectangle.

The draw functions are called once in the OBU at the start of every day.

Everything is working fine, except when I go down to a 1min chart, the lines and rectangles suddenly disappear. If I scroll to the left or right, they are displayed again, and as I scroll horizontally, they seem to go on and off. If I zoom out the 1min, everything is displayed correctly. On the 5min, it works as well.

This looks like a render problem when I have a zoomed in 1min chart but I can't quite figure it out. Thanks.

[silacitrader]

Update: On the 5-min, if I continue to zoom in (Ctrl+Down), at some point the lines and rectangles disappear. Another zoom level with Ctrl+Down and they appear again. If I keep zooming in and they disappear.

This is obviously a rendering issue.

[NinjaTrader_PatrickH]

Hello silacitrader,

Thank you for your post.

This occurs when the anchor points of the object (beginning and ending points) are outside of the view-able range.

Objects with greater than or equal to two anchor points can disappear while scrolling when either anchor point is far away from the display range. It is possible to have both anchors off the visible range, but still have the object and as you scroll a little bit then to have the line disappear despite both anchors still being outside the visible range.

Please let me know if you have any questions.

[silacitrader]

Thank you Patrick, that explains it.

It's not a big deal, the logic is working fine, but is there any better practice to drawing horizontal lines?

Thanks

[NinjaTrader_PatrickH]

Hello silacitrader,

Are you referring to DrawHoriztonalLine()?

• DrawHorizontalLine(): http://www.ninjatrader.com/support/h...zontalline.htm

[silacitrader]

Hi, no I'm actually referring to DrawLine as lines will be different for any given session/day.

[NinjaTrader_PatrickH]

Hello silacitrader,

Thank you for your response.

is there any better practice to drawing horizontal lines?

Can you expand upon this inquiry further?