Converting a bar index and closing price to SharpDX vector.

[forrestang]

Hello.

I've been jumping around in the documentation and playing around in my editor for about 2 hours trying to convert a bar index and closing price into a SharpDX vector coordinate but can't seem to get it to work.

So I am wanting to use the rightmost bar that will work with scrolling, so I got the index via:

ChartBars.ToIndex

I was able to get the closing price of that bar via:

Close.GetValueAt(ChartBars.ToIndex

I see that I can find the bar index n-bars to the left of the right most bar via:

ChartBars.ToIndex-3

I am wanting to get a position on the canvas, the SharpDX vectors. Just to get a vector for a start point, I tried:

float startX =  chartControl.GetXByBarIndex(ChartBars,ChartBars.ToIndex);
float startY =  chartScale.GetYByValue(ChartBars.ToIndex);

The above would just give me one point on the chart, but I am unsure if this is correct?

Is there a preferred, simple way of converting a bar index, and a price to a vector?

[forrestang]

Had an epiphany, figured it out while sitting on the toilet. When I was printing out the vectors I thought I was printing, I realized that the bar index I was printing was changing, but the canvas point I was printing was not. I initially was thinking that something was wrong... but that they in fact should be moving as I scroll the chart... because I was printing a fixed location using the ToIndex. If all that sounds confusing... you can see the 2 vectors created below, and it in fact does what I want it to.

This simply gives me the XY position of the right most bar on the chart, along with the position 5 bars prior to that value.

protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
if (ChartBars != null)
 {
    float startX = chartControl.GetXByBarIndex(ChartBars,ChartBars.To Index-5);
    float startY = chartScale.GetYByValue(Close.GetValueAt(ChartBars. ToIndex));

    float endX = chartControl.GetXByBarIndex(ChartBars,ChartBars.To Index);
    float endY = chartScale.GetYByValue(Close.GetValueAt(ChartBars. ToIndex));
 }
}