DownBrushDX

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protected override void OnRender(ChartControl chartControl, ChartScale chartScale, ChartBars chartBars)
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{
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   for (int idx = chartBars.FromIndex; idx <= chartBars.ToIndex; idx++)
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       {
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           double     closeValue             = bars.GetClose(idx); 
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           double     openValue               = bars.GetOpen(idx);
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           // Set the brush of the current candle to UpBrushDX or DownBrushDX, depending on the 
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           // bar direction
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           Brush brush = closeValue >= openValue ? UpBrushDX : DownBrushDX;
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       }
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}