DrawLine into the future

[scjohn]

To draw a line into the future, one must supply a startTime and a endTime. Most of the time, for the first DrawLine, Time[0] will be the initial startTime. Now how does one go about calculating the endTime. If the Data Interval is 1-minute then calculating the endtime is rather simple - endTime = Time[0].AddMInute(1). But what do you due when the Data Interval is Tick, Volume, Range, etc.? The x-axis is not fixed like for a minute chart. The x-axis scale is not fixed for a Tick chart. Does one have to worry about screwing up the x-axis when drawing into the future. When drawing into the future on a variable x-axis is the calculation for endTime just as simple as for a minute chart? In other words, one can use endTime = Time[0].AddMinute(1) for all Data Intervals.

Thanks.

[NinjaTrader_RyanM1]

Hello scjohn,

For non time-based charts, each additional bar is projected 1 second beyond the last. It's tricky because as you note, the X axis in the future is dynamic and will change with every incoming tick. Your line can change lengths because of this.

[koganam]

To draw a line into the future, one must supply a startTime and a endTime. Most of the time, for the first DrawLine, Time[0] will be the initial startTime. Now how does one go about calculating the endTime. If the Data Interval is 1-minute then calculating the endtime is rather simple - endTime = Time[0].AddMInute(1). But what do you due when the Data Interval is Tick, Volume, Range, etc.? The x-axis is not fixed like for a minute chart. The x-axis scale is not fixed for a Tick chart. Does one have to worry about screwing up the x-axis when drawing into the future. When drawing into the future on a variable x-axis is the calculation for endTime just as simple as for a minute chart? In other words, one can use endTime = Time[0].AddMinute(1) for all Data Intervals.

Thanks.

No need to calculate. Just use the signature for a time-based line.

DrawLine(string tag, bool autoScale, DateTime startTime, double startY, DateTime endTime, double endY, Color color, DashStyle dashStyle, int width);