Volume on the chart

Modified on Fri, 04 Aug 2023 at 01:21 PM

The indicator, which was inherited from the standard Volume indicator, was created in this example. The OnCalculate method was redefined and left empty (to avoid unnecessary calculations). And outlined the rendering logic in the OnRender method. Colours are taken from the base indicator DataSeries.

[DisplayName("Volume on the chart")]

    public class VolumeOnChart : Volume

        private decimal _height = 15;

        public decimal Height

            get { return _height; }

set

                if (value < 10 || value > 100)

                    return;

                _height = value;

        public VolumeOnChart()

            EnableCustomDrawing = true;

            SubscribeToDrawingEvents(DrawingLayouts.LatestBar);

            Panel = IndicatorDataProvider.CandlesPanel;

        protected override void OnCalculate(int bar, decimal value)

        protected override void OnRender(RenderContext context,  DrawingLayouts layout)

            var maxValue = 0m;

            var maxHeight = ChartInfo.Region.Height * _height/100m;

            var positiveColor = ((ValueDataSeries)DataSeries[0]).Color.Convert(); // color from positive dataseries

            var negativeColor = ((ValueDataSeries)DataSeries[1]).Color.Convert(); // color from negative dataseries

            var neutralColor = ((ValueDataSeries)DataSeries[2]).Color.Convert(); // color from neutral dataseries

            var filterColor = ((ValueDataSeries)DataSeries[3]).Color.Convert(); // color from filter dataseries

            for (int i = FirstVisibleBarNumber; i <= LastVisibleBarNumber; i++)

                var candle = GetCandle(i);

                var volumeValue = Input == InputType.Volume ? candle.Volume : candle.Ticks;

                maxValue = Math.Max(volumeValue, maxValue);

            for (int i = FirstVisibleBarNumber; i <= LastVisibleBarNumber; i++)

                var candle = GetCandle(i);

                var volumeValue = Input == InputType.Volume ? candle.Volume : candle.Ticks;

                Color volumeColor;

                if (UseFilter && volumeValue > FilterValue)

                    volumeColor = filterColor;

                else

                    if (DeltaColored)

                        if (candle.Delta > 0)

                            volumeColor = positiveColor;

                        else if (candle.Delta < 0)

                            volumeColor = negativeColor;

                        else

                            volumeColor = neutralColor;

                    else

                        if (candle.Close > candle.Open)

                            volumeColor = positiveColor;

                        else if (candle.Close < candle.Open)

                            volumeColor = negativeColor;

                        else

                            volumeColor = neutralColor;

                var x = ChartInfo.GetXByBar(i);

                var height = (int)(maxHeight * volumeValue / maxValue);

                var rectangle = new Rectangle(x, ChartInfo.Region.Height - height, (int)ChartInfo.PriceChartContainer.BarsWidth, height);

                context.FillRectangle(volumeColor, rectangle);

        public override string ToString()

            return "Volume on the chart";