chartControl.GetBarPaintWidth(chartControl.BarsArray[0]) doesn't seem to work

[cre8able]

I'm trying to make a dot in OnRender that is the same width as the bars, and shrinks as you zoom in on the chart.

I have a class level variable I set in OnRender

barWidthP        = chartControl.GetBarPaintWidth(chartControl.BarsArray[0]);

then I use it in a method

//==================================================================================================            
        private void RenderEntryDot(ChartControl chartControl, ChartScale chartScale,    int x, double center)
        {
            int c1;
            c1                 = chartScale.GetYByValue(center);
            lineStart         = new SharpDX.Vector2(x, c1);

            dot = new SharpDX.Direct2D1.Ellipse(lineStart, barWidthP, barWidthP);        
            RenderTarget.FillEllipse(dot, DxBrushWhite);
        }
​

the dot shrinks when I zoom in, but it doesn't appear to be the bar width. What am I dong wrong?

[NinjaTrader_Gaby]

Hello cre8able,

Thank you for your post.

Is the dot the same width as the bars initially, but not shrinking with the bars? Or is it not the same width from the start?

To confirm, barWidthP is being calculated in OnRender correct? Where is RenderEntryDot being called?

I look forward to your response.

[cre8able]

Hey Gaby

It's not the same width initially. The image shows how wide it is when I load it on the chart.

It does shrink/grow as I zoom the chart, so it does respond to scaling.

BarWidthP is called from OnRender

I also call RenderEntryDot from OnRender.

I also tried chartControl.Properties.BarDistance but that didn't work either.

        protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
        {
            barWidthP        = chartControl.GetBarPaintWidth(chartControl.BarsArray[0]);
//            barWidthP        = (int)chartControl.Properties.BarDistance - chartControl.GetBarPaintWidth(chartControl.BarsArray[0]);
            
            stagger = 0;        //    set stagger to zero so open gap targets don't move
//=====    SWING HIGHS            
            for (int x = SwingHighsClosed.Count - 1; x >= 0 ; x--)
                RenderSwingHighs(SwingHighsClosed[x].price, SwingHighsClosed[x].startTime, SwingHighsClosed[x].endTime, SwingHighsClosed[x].eqhlCount, chartControl, chartScale);
            
            for (int x = SwingHighs.Count - 1; x >= 0 ; x--)
                RenderSwingHighs(SwingHighs[x].price, SwingHighs[x].startTime, SwingHighs[x].endTime, SwingHighs[x].eqhlCount, chartControl, chartScale);
//=====    SWING LOWS
            for (int x = SwingLowsClosed.Count - 1; x >= 0 ; x--)
                RenderSwingLows(SwingLowsClosed[x].price, SwingLowsClosed[x].startTime, SwingLowsClosed[x].endTime, SwingLowsClosed[x].eqhlCount, chartControl, chartScale);
            
            for (int x = SwingLows.Count - 1; x >= 0 ; x--)
                RenderSwingLows(SwingLows[x].price, SwingLows[x].startTime, SwingLows[x].endTime, SwingLows[x].eqhlCount, chartControl, chartScale);
            
//=====    CLOSED BULL GAPS
            for (int x = BullGapsClosed.Count - 1; x >= 0 ; x--)
            {            
                RenderBullFVGsClosed(x, chartControl, chartScale);
                RenderEntryDot(chartControl, chartScale,chartControl.GetXByTime(BullGapsClosed[x].endTime),  BullGapsClosed[x].entry);
                if (ShowTargets)                
                    RenderTargets(chartControl, chartScale, chartControl.GetXByTime(BullGapsClosed[x].endTime), BullGapsClosed[x].entry, BullGapsClosed[x].tFixed, BullGapsClosed[x].sFixed, BullGapsClosed[x].be);
            }
//=====    CLOSED BEAR GAPS            
            for (int x = BearGapsClosed.Count - 1; x >= 0 ; x--)
            {            
                RenderBearFVGsClosed(x, chartControl, chartScale);
                RenderEntryDot(chartControl, chartScale,chartControl.GetXByTime(BearGapsClosed[x].endTime),  BearGapsClosed[x].entry);
                if (ShowTargets)                                
                    RenderTargets(chartControl, chartScale, chartControl.GetXByTime(BearGapsClosed[x].endTime), BearGapsClosed[x].entry, BearGapsClosed[x].tFixed, BearGapsClosed[x].sFixed, BearGapsClosed[x].be);
            }        
​

[cre8able]

Hey Gabby

when I draw a triangle, it does make it the same width as the bar

        private void RenderArrow(ChartControl chartControl, ChartScale chartScale, int x1, int y1, int direction)
        {
    
            float arrowheadHeight        = (float)(barWidthP);// * 1.5);
            float arrowheadWidth        = arrowheadHeight / 2;
            float shaftHeight            = arrowheadHeight * 2;
            float shaftWidth            = arrowheadHeight / 3;
                
            DxVector1 = new SharpDX.Vector2(x1, y1);
            DxVector2 = new SharpDX.Vector2(x1 + arrowheadWidth * direction, y1 - arrowheadHeight * direction);
            DxVector3 = new SharpDX.Vector2(x1 - arrowheadWidth * direction, y1 - arrowheadHeight * direction);
            DxVector4 = new SharpDX.Vector2(x1, y1 - arrowheadHeight * direction);
            DxVector5 = new SharpDX.Vector2(x1, y1 - shaftHeight * direction);
                            
            SharpDX.Direct2D1.Triangle triangle = new SharpDX.Direct2D1.Triangle();
            triangle.Point1 = DxVector2;
            triangle.Point2 = DxVector3;
            triangle.Point3 = DxVector1;
            SharpDX.Direct2D1.Mesh triangleMesh = new SharpDX.Direct2D1.Mesh(RenderTarget, new SharpDX.Direct2D1.Triangle[] {triangle});
            
            RenderTarget.FillMesh(triangleMesh, DxBrushYellow);
                
            RenderTarget.DrawLine(DxVector4, DxVector5, DxBrushYellow, shaftWidth);

        }
​
​

[cre8able]

Hey Gaby

Sorry, I just figured it out.

I thought the parameter for Ellipse was diameter, but its radius so the dot was twice as big as I was expecting. Oops