Biggest Trade Indicator

Demonstrates custom chart rendering with StrategyBigTradeIndicator. The strategy finds the biggest trade visible on the chart and draws a rectangle around its marker using SharpDX.

Source: [INSTALL PATH]/API/Samples/BiggestTradeIndicator.cs Class: BiggestTradeIndicator : MZpackStrategyBase

What It Covers

• StrategyBigTradeIndicator setup with trade volume filter
• Custom OnRender override for SharpDX drawing
• Accessing BigTradeBaseMVC.TradesView to iterate chart trades
• OnRenderTargetChanged for brush lifecycle

Indicator Setup

protected List<TickIndicator> CreateIndicators()
{
    List<TickIndicator> indicators = new List<TickIndicator>();

    BigTradeIndicator = new StrategyBigTradeIndicator(this, @"BiggestTrade")
    {
        TradeFilterMin = TradeFilterMin,
        TradeFilterMax = TradeFilterMax,
        ShowVersionInfo = false
    };
    indicators.Add(BigTradeIndicator);

    return indicators;
}

Custom Rendering

OnRender collects all trade views from visible chart bars, sorts by volume, and draws a rectangle around the largest:

protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
    base.OnRender(chartControl, chartScale);

    // Collect trades from visible chart bars
    List<ITradeView> chartTradesViews = new List<ITradeView>();
    for (int i = BigTradeIndicator.__ChartBars.FromIndex;
         i <= BigTradeIndicator.__ChartBars.ToIndex; i++)
    {
        List<ITradeView> tradesOfBar;
        if (((BigTradeBaseMVC)BigTradeIndicator.IndicatorMVC)
            .TradesView.TryGetValue(i, out tradesOfBar))
        {
            chartTradesViews.AddRange(tradesOfBar);
        }
    }

    // Find biggest trade
    chartTradesViews.Sort((a, b) => a.Trade.Volume.CompareTo(b.Trade.Volume));
    BigTradeViewItem biggestTradeView = chartTradesViews.LastOrDefault()
        as BigTradeViewItem;

    // Draw rectangle around it
    if (biggestTradeView != null)
    {
        var bounds = new System.Drawing.RectangleF(
            biggestTradeView.ShapeBounds.Location,
            biggestTradeView.ShapeBounds.Size);
        bounds.Inflate(new System.Drawing.SizeF(5, 5));

        RenderTarget.DrawRectangle(
            Helper.FromSystemDrawingRetcangleF(bounds),
            BiggestTradeMarkerStroke.BrushDX,
            BiggestTradeMarkerStroke.Width,
            BiggestTradeMarkerStroke.StrokeStyle);
    }
}

The OnRenderTargetChanged override sets BiggestTradeMarkerStroke.RenderTarget = RenderTarget to initialize the SharpDX brush when the render target changes.

Properties

Property	Default	Description
TradeFilterMin	150	Minimum trade size
TradeFilterMax	-1	Maximum trade size (-1 = no limit)
BiggestTradeMarkerStroke	LightBlue, width 3	Stroke for the rectangle marker

See Also

• MZpackStrategyBase — base class
• Working with Samples — how to compile samples