Hello Willie,
Thank you for writing.
If I understand correctly, you need to customize the data points displayed in the chart. This can be accomplished with a custom renderer and custom
CandlestickSeriesDrawPart:
https://docs.telerik.com/devtools/winforms/chartview/customization/custom-rendering.
In the context of the CandleStickSeries you can change the renderer this way:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.radChartView1.CreateRenderer += radChartView1_CreateRenderer;
CandlestickSeries candlestickSeries = new CandlestickSeries();
//o h l c
candlestickSeries.DataPoints.Add(new OhlcDataPoint(10, 11, 7, 8, DateTime.Now));
candlestickSeries.DataPoints.Add(new OhlcDataPoint(8, 9, 5, 9, DateTime.Now.AddDays(1)));
candlestickSeries.DataPoints.Add(new OhlcDataPoint(12, 12, 9, 10, DateTime.Now.AddDays(2)));
candlestickSeries.DataPoints.Add(new OhlcDataPoint(7, 10, 6, 9, DateTime.Now.AddDays(3)));
this.radChartView1.Series.Add(candlestickSeries);
}
private void radChartView1_CreateRenderer(object sender, ChartViewCreateRendererEventArgs e)
{
e.Renderer = new CustomCartesianRenderer(e.Area as CartesianArea);
}
}
public class CustomCartesianRenderer : CartesianRenderer
{
public CustomCartesianRenderer(CartesianArea area)
: base(area)
{ }
protected override void Initialize()
{
base.Initialize();
for (int i = 0; i < this.DrawParts.Count; i++)
{
CandlestickSeriesDrawPart linePart = this.DrawParts[i] as CandlestickSeriesDrawPart;
if (linePart != null)
{
this.DrawParts[i] = new MyCandlestickSeriesDrawPart((CandlestickSeries)linePart.Element, this);
}
}
}
}
public class MyCandlestickSeriesDrawPart : CandlestickSeriesDrawPart
{
public MyCandlestickSeriesDrawPart(CandlestickSeries series, IChartRenderer renderer)
: base(series, renderer)
{ }
public override void DrawSeriesParts()
{
RadGdiGraphics radGraphics = new RadGdiGraphics(((Graphics)this.Renderer.Surface));
for (int i = 0; i < this.Element.Children.Count; i++)
{
DataPointElement childElement = (DataPointElement)this.Element.Children[i];
RadRect slot = this.Element.DataPoints[i].LayoutSlot;
RectangleF rect = new RectangleF((float)(this.OffsetX + slot.X), (float)(this.OffsetY + slot.Y), (float)slot.Width, (float)slot.Height);
rect.Y++;
OhlcDataPoint point = this.Element.DataPoints[i] as OhlcDataPoint;
GraphicsPath path = ConstructPath(point, rect);
if (childElement.BackgroundShape != null)
{
childElement.BackgroundShape.Paint((Graphics)radGraphics.UnderlayGraphics, rect);
}
if (point.IsFalling)
{
FillPrimitiveImpl fill = new FillPrimitiveImpl(childElement, null);
fill.PaintFill(radGraphics, path, rect);
}
BorderPrimitiveImpl border = new BorderPrimitiveImpl(childElement, null);
border.PaintBorder(radGraphics, null, path, rect);
rect.Y--;
radGraphics.DrawLine(Color.Red, rect.X, rect.Y + rect.Height / 2, rect.X + rect.Width, rect.Y + rect.Height / 2);
}
}
}
The example above will draw a median line through each of the data points. It is up to you, to implement the DrawSeriesParts method according to your scenario.
Should you have further questions please do not hesitate to write back.
Regards,
Hristo
Progress Telerik