OnRender method draws rectangles upsidedown

[bkinvent]

I wish to use SharpDX to draw volume bars that overlap the main chart, while controlling its opacity dynamically. This is what I've attempted so far:

...
           
            for (int idx = ChartBars.FromIndex; idx <= ChartBars.ToIndex; idx++)
            {
                float x = chartControl.GetXByBarIndex(ChartBars, idx);
                long v2 = ChartBars.Bars.GetVolume(idx);
                float v2y = chartScale.GetYByValue(v2);
                rect.X = x - barWidth * 0.5f + 0.5f;
                rect.Y = 0;
                rect.Width = barWidth - 1;
                rect.Height = v2;

                
                RenderTarget.FillRectangle(rect, cbrush);
				
            }cbrush.Dispose();
        }
...

I don't know what I'm doing wrong, but the rectangle are drawn upside down; also the left-hand side y-axis volume units do not appear to be correct... What can I do to incorporate OnMarketData information on a tick by tick basis into my OnRender method call?

[NinjaTrader_Jesse]

Hello,

Thank you for the question.

I checked the sample but was noticed there are a few missing variables here, I wanted to see if you could post a full example with your variables and how you are calculating the barWidth variable.

I would like to first see what you are before trying to address your question.

I look forward to being of further assistance.