Completed
Last Updated: 15 May 2024 07:49 by ADMIN
Release 2024.2.514 (2024 Q2)

Legend Item Text is not visible in Windows11Dark. This is because the LegendItem  A possible workaround is to subscribe to the VisualItemCreating event. In the event handler, we can create a new LegendItemElement and set its ForeColor.

private void LegendElement_VisualItemCreating(object sender, LegendItemElementCreatingEventArgs e)
{            
    e.ItemElement = new LegendItemElement(e.LegendItem) { ForeColor = Color.Black };
}

Completed
Last Updated: 15 May 2024 07:49 by ADMIN
Release 2024.2.514 (2024 Q2)

Currently, VisualStudio2012DarkTheme has a white background in order to be able to read the labels. This change was done when addressing this item:

https://feedback.telerik.com/winforms/1535458-radchartview-the-axis-label-are-difficult-to-read-in-visualstudio2012darktheme 

However, it is inconsistent a dark theme to have a white background color. The design should be improved to achieve consistent look and feel.

Duplicated
Last Updated: 26 Feb 2024 10:09 by ADMIN
Created by: Chris
Comments: 1
Category: ChartView
Type: Feature Request
1
Allow user to export current view as an image.
Declined
Last Updated: 16 Feb 2024 22:20 by ADMIN
Created by: Ian
Comments: 2
Category: ChartView
Type: Feature Request
0
Some other charting frameworks support ‘dynamic’ graphs/diagrams, where the graph shows nodes and links, and the user can drag the nodes around the page, and the other nodes are pulled around it. This is a great way to visualise and explore this kind of node+link data. Its also a great way to sell and app, as it looks cool.
Completed
Last Updated: 31 Jan 2024 11:39 by ADMIN
Release 2024 Q1 (2024.1.130)

Before zoom: 

After zoom:

 

Unplanned
Last Updated: 31 Jul 2023 16:44 by ADMIN

Hello Telerik Support,

after taking my first steps with RangeSelector and ChartView controls I found an issue with a simple bar chart. The length of some bars in the chart of the RangeSelector doesn't match with the bars in the ChartView. The relation is wrong.I provided a screenshot and marked the bars. I could provide a sample application, but I can't attach a zip file, so here's the code of the main form:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Telerik.WinControls;
using Telerik.WinControls.UI;
 
namespace TelerikChartView
{
    public partial class MainForm : Telerik.WinControls.UI.RadForm
    {
        private List<Kapazitaetspunkt> _BackListPunkte;
        private BindingList<Kapazitaetspunkt> Punkte;
 
        public MainForm()
        {
            InitializeComponent();
        }
 
        private void MainForm_Load(object sender, EventArgs e)
        {
            _BackListPunkte = new List<Kapazitaetspunkt>();
            Punkte = new BindingList<Kapazitaetspunkt>(_BackListPunkte);
            //Punkte = new BindingList<Kapazitaetspunkt>();
            rngTimeSelector.AssociatedControl = cvChart;
            rngTimeSelector.RangeSelectorElement.ScrollSelectorElement.Visibility = ElementVisibility.Collapsed;
 
            BarSeries bars = new BarSeries();
            bars.DataSource = Punkte;
            bars.ValueMember = nameof(Kapazitaetspunkt.Percentage);
            bars.CategoryMember = nameof(Kapazitaetspunkt.Date);
            cvChart.Series.Add(bars);
        }
 
        private void GenerateTestData(int addMonths = 0)
        {
            Punkte.Clear();
            const int count = 25;
            const int step = 4;
            var von = DateTime.Today.AddMonths(addMonths);
            var bis = von.AddDays(count);
            double percentage = 0;
            //_BackListPunkte.Add(new Kapazitaetspunkt(von.AddDays(-1), null));
            Punkte.Add(new Kapazitaetspunkt(von.AddDays(-1), null));
 
            while (von < bis)
            {
                //_BackListPunkte.Add(new Kapazitaetspunkt(von, percentage));
                Punkte.Add(new Kapazitaetspunkt(von, percentage));
                percentage += step;
                von = von.AddDays(1);
            }
 
            //_BackListPunkte.Add(new Kapazitaetspunkt(von.AddDays(1), null));
            Punkte.Add(new Kapazitaetspunkt(von.AddDays(1), null));
        }
 
        private void btnGenerateData_Click(object sender, EventArgs e)
        {
            GenerateTestData();
 
            rngTimeSelector.RangeSelectorElement.InitializeElements();
            rngTimeSelector.RangeSelectorElement.ResetLayout(true);
        }
 
        private void btnGenerateData2_Click(object sender, EventArgs e)
        {
            GenerateTestData(2);
 
            rngTimeSelector.RangeSelectorElement.InitializeElements();
            rngTimeSelector.RangeSelectorElement.ResetLayout(true);
 
        }
 
        private void rngTimeSelector_ScaleInitializing(object sender, ScaleInitializingEventArgs e)
        {
            e.Cancel = true;
        }
    }
 
    public class Kapazitaetspunkt : INotifyPropertyChanged
    {
        private DateTime _Date;
 
        public DateTime Date
        {
            get => _Date;
            set
            {
                if (value != Date)
                {
                    _Date = value;
                    OnPropertyChanged();
                }
            }
        }
 
 
        public double? _Percentage;
 
        public double? Percentage
        {
            get => _Percentage;
            set
            {
                if (value != Percentage)
                {
                    _Percentage = value;
                    OnPropertyChanged();
                }
            }
        }
 
 
        public Kapazitaetspunkt(DateTime date, double? percentage)
        {
            Date = date;
            Percentage = percentage;
        }
 
 
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

Regards,

Stephan

Unplanned
Last Updated: 22 Feb 2023 09:34 by ADMIN

Use the following setup:

        

private void RadForm1_Load(object sender, EventArgs e) { // TODO: This line of code loads data into the 'nwindDataSet.Orders' table. You can move, or remove it, as needed.this.ordersTableAdapter.Fill(this.nwindDataSet.Orders); this.radPivotGrid1.RowGroupDescriptions.Add(new DateTimeGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Year, GroupComparer = new GroupNameComparer() }); this.radPivotGrid1.RowGroupDescriptions.Add(new DateTimeGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Quarter, GroupComparer = new GroupNameComparer() }); this.radPivotGrid1.RowGroupDescriptions.Add(new DateTim

eGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Month, GroupComparer = new GroupNameComparer() }); this.radPivotGrid1.ColumnGroupDescriptions.Add(new PropertyGroupDescription() { PropertyName = "EmployeeID", GroupComparer = new GrandTotalComparer() }); this.radPivotGrid1.AggregateDescriptions.Add(new PropertyAggregateDescription() { PropertyName = "Freight", AggregateFunction = AggregateFunctions.Sum }); this.radPivotGrid1.AggregateDescriptions.Add(new PropertyAggregateDescription() { PropertyName = "Freight", AggregateFunction = AggregateFunctions.Average }); this.radPivotGrid1.FilterDescriptions.Add(new PropertyFilterDescription() { PropertyName = "ShipCountry", CustomName = "Country" }); this.radPivotGrid1.DataSource = this.ordersBindingSource; this.radPivotGrid1.ChartDataProvider.UpdateCompleted += radPivotGrid1_UpdateCompleted; this.radChartView1.DataSource = this.radPivotGrid1; } private void radPivotGrid1_UpdateCompleted(object sender, EventArgs e) { foreach (CartesianSeries series inthis.radChartView1.Series) { series.ShowLabels = true; series.LabelRotationAngle = 90; } }

Once you select "% of Grand Total" for one of the aggregates, it would be good the respective chart labels to be formatted in a similar way out of the box:

Desired Behavior:

Actual behavior:

 

Unplanned
Last Updated: 24 Jan 2023 14:31 by ADMIN
Currently, it is not possible to rotate the labels of the Polar/Radial axis.
Completed
Last Updated: 27 Sep 2022 13:31 by ADMIN
Release R3 2022

Please refer to the attached sample project. Try to select a point.

Expected result: the clicked point should be colored in red.

Actual result: a random point is colored in red even though the label is colored correctly. The attached gif file illustrates the observed result.


Completed
Last Updated: 23 Sep 2022 13:07 by ADMIN
Release R3 2022
Created by: Hendriette
Comments: 0
Category: ChartView
Type: Feature Request
1
The Drop option is available for WPF: https://docs.telerik.com/devtools/wpf/controls/radchart/features/empty-values
Unplanned
Last Updated: 25 Aug 2022 07:59 by mark gamache
A typical scenario is setting the green/red color to the CandleStick series. In the current implementation, you will need to create a custom CandlestickSeriesDrawPart to add the FillPrimitiveImpl element which is not drawn for raising data points.
Unplanned
Last Updated: 16 Mar 2022 16:01 by ADMIN

Please use the following code snippet and click the button to print the chart: 

        public RadForm1()
        {
            InitializeComponent();

            Random rand = new Random();
            for (int i = 0; i < 50; i++)
            {
                LineSeries lineSeries = new LineSeries();
                lineSeries.LegendTitle = "Series" + i;
                lineSeries.DataPoints.Add(new CategoricalDataPoint(rand.Next(0,20), "Jan"));
                lineSeries.DataPoints.Add(new CategoricalDataPoint(rand.Next(0,20), "Apr"));
                lineSeries.DataPoints.Add(new CategoricalDataPoint(rand.Next(0,20), "Jul"));
                lineSeries.DataPoints.Add(new CategoricalDataPoint(rand.Next(0,20), "Oct"));
                this.radChartView1.Series.Add(lineSeries);
            }
            this.radChartView1.ShowLegend = true;
            this.radChartView1.ChartElement.LegendPosition = LegendPosition.Bottom;
        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            this.radChartView1.PrintPreview();
        }

Expected:

Actual:

Workaround: 

https://docs.telerik.com/devtools/winforms/knowledge-base/chartview-wrap-legend-items

         internal class MyChart : RadChartView
        {
            protected override RadChartElement CreateChartElement()
            {
                return new MyChartElement();
            }
        }

        internal class MyChartElement : RadChartElement
        {
            protected override ChartLegendElement CreateChartLegendElement()
            {
                return new MyLegendElement(this);
            }

            protected override Type ThemeEffectiveType
            {
                get
                {
                    return typeof(RadChartElement);
                }
            }
        }

        internal class MyLegendElement : ChartLegendElement
        {
            private RadListViewElement panel;

            public MyLegendElement(RadChartElement chartElement) : base(chartElement)
            {
            }

            protected override void OnLegendInfosCollectionChanged(Telerik.WinControls.Data.NotifyCollectionChangedEventArgs e, bool providerChange)
            {
                base.OnLegendInfosCollectionChanged(e, providerChange);
                if (e.Action == Telerik.WinControls.Data.NotifyCollectionChangedAction.Add)
                {
                    LegendItem li = e.NewItems[0] as LegendItem;
                    panel.Items.Add(li.Title);
                    panel.Items.Last().Tag = li.Element;
                }
                panel.SelectedIndex = -1;
            }

            protected override void CreateChildElements()
            {
                base.CreateChildElements();
                panel = new RadListViewElement();
                panel.VisualItemFormatting += ListView_VisualItemFormatting;
                panel.ShowCheckBoxes = true;
                panel.StretchHorizontally = true;
                panel.StretchVertically = false;
                panel.ViewType = ListViewType.IconsView;
                panel.ItemSize = new System.Drawing.Size(100, 20);
                panel.ShouldHandleMouseInput = true;
                panel.NotifyParentOnMouseInput = false;
                panel.MaxSize = new System.Drawing.Size(int.MaxValue, 200);
                this.StackElement.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
                this.Children.Add(panel);
            }

            protected override Type ThemeEffectiveType
            {
                get
                {
                    return typeof(ChartLegendElement);
                }
            }

            private void ListView_VisualItemFormatting(object sender, ListViewVisualItemEventArgs e)
            {
                ListViewItemCheckbox checkBox = e.VisualItem.ToggleElement as ListViewItemCheckbox;
                if (checkBox != null)
                {
                    e.VisualItem.ToggleElement.ShouldHandleMouseInput = false;
                    e.VisualItem.ToggleElement.NotifyParentOnMouseInput = false;
                    checkBox.CheckMarkPrimitive.Fill.BackColor = ((LineSeries)(e.VisualItem.Data.Tag)).BorderColor;
                    checkBox.CheckMarkPrimitive.Fill.GradientStyle = Telerik.WinControls.GradientStyles.Solid;
                    checkBox.CheckMarkPrimitive.Border.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
                }
            }
        }

 

 

 

Duplicated
Last Updated: 15 Feb 2022 08:16 by ADMIN
Created by: Ian
Comments: 1
Category: ChartView
Type: Feature Request
0
Please can we have a heatmap chart type. Personally, I’m not conviced its really useful, but my customers seem to like them, and most charting frameworks seem to have then. And I suppose I have to deliver what my customers want. Sigh.
Completed
Last Updated: 18 Oct 2021 09:09 by ADMIN
Release R3 2021 SP1
Completed
Last Updated: 31 Aug 2021 16:03 by ADMIN
Release R3 2021

System.OverflowException: 'Value was either too large or too small for a Decimal.

To reproduce:

var lineSeries = new LineSeries();
lineSeries.DataPoints.Add(new CategoricalDataPoint(0, "A"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(Convert.ToDouble(decimal.MaxValue), "B"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(0, "C"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(decimal.ToDouble(decimal.MaxValue), "D"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(0, "E"));

this.radChartView1.Series.Add(lineSeries);

Completed
Last Updated: 30 Jul 2021 14:46 by ADMIN
Release R3 2021
Unplanned
Last Updated: 25 Jun 2021 08:14 by ADMIN
As you can see in the video, the trackball gets flickering and sometimes disappearing on the mouse move.

To Reproduce, make sure to keep the mouse over the trackball text box.
Unplanned
Last Updated: 16 Jun 2021 08:51 by ADMIN

Please use the following code snippet:

        public RadForm1()
        {
            InitializeComponent();

            this.radChartView1.View.AreaType = ChartAreaType.Cartesian;
            RangeBarSeries rangeBarSeries = new RangeBarSeries();

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/17/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/17/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 4, DateTime.Now.TimeOfDay.TotalMinutes + 2, "5/17/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 30, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/18/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/18/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 4, DateTime.Now.TimeOfDay.TotalMinutes + 2, "5/19/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes - 89, DateTime.Now.TimeOfDay.TotalMinutes - 100, "5/20/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/20/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes - 79, DateTime.Now.TimeOfDay.TotalMinutes - 90, "5/21/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/21/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/22/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/22/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/23/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/23/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/25/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/24/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/26/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/26/2021"));

            this.radChartView1.View.Series.Add(rangeBarSeries); 
            rangeBarSeries.VerticalAxis.LabelRotationAngle = -45;
            rangeBarSeries.VerticalAxis.LabelFitMode = AxisLabelFitMode.Rotate;

            LinearAxis verticalAxis = this.radChartView1.View.Axes.Get<LinearAxis>(1);
            verticalAxis.Minimum = 0; //Minutes 0:00
            verticalAxis.Maximum = 1440; //Minutes 23:00
            verticalAxis.MajorStep = 60; //60 minutes in an hour
            verticalAxis.LastLabelVisibility = AxisLastLabelVisibility.Hidden; 
        
        }

When the labels are not rotated:

When rotated:

Unplanned
Last Updated: 16 Jun 2021 05:10 by ADMIN
Created by: chandrasekhar
Comments: 0
Category: ChartView
Type: Bug Report
0

Please use the following code snippet. You will notice that for very long text in the trackball, the fill rectangle doesn't fit the text.

PS. If the legend items occupy enough width of the chart, there wouldn't be sufficient space for the trackball.

        public RadForm1()
        {
            InitializeComponent();

            BarSeries barSeries = new BarSeries("Performance", "RepresentativeName");
            barSeries.LegendTitle = "Q1 This is some sample very long text";
            barSeries.DataPoints.Add(new CategoricalDataPoint(177, "Harley"));
            barSeries.DataPoints.Add(new CategoricalDataPoint(128, "White"));
            barSeries.DataPoints.Add(new CategoricalDataPoint(143, "Smith"));
            barSeries.DataPoints.Add(new CategoricalDataPoint(111, "Jones"));
            barSeries.DataPoints.Add(new CategoricalDataPoint(118, "Marshall")); 
            this.radChartView1.Series.Add(barSeries);
            BarSeries barSeries2 = new BarSeries("Performance", "RepresentativeName");
            barSeries2.LegendTitle = "Q2 This is some sample very long text";
            barSeries2.DataPoints.Add(new CategoricalDataPoint(153, "Harley"));
            barSeries2.DataPoints.Add(new CategoricalDataPoint(141, "White"));
            barSeries2.DataPoints.Add(new CategoricalDataPoint(130, "Smith"));
            barSeries2.DataPoints.Add(new CategoricalDataPoint(88, "Jones"));
            barSeries2.DataPoints.Add(new CategoricalDataPoint(109, "Marshall"));
            this.radChartView1.Series.Add(barSeries2);

            this.radChartView1.ShowLegend = true;
      
            ChartTrackballController trackballController = new ChartTrackballController();
            trackballController.TextNeeded += trackballController_TextNeeded;
            radChartView1.Controllers.Add(trackballController);
        }

        string text = "<html><color=200,200,200,200>This is some sample very long text that wouldn't fit in " +
                      "the default size of the RadChartView from the Telerik UI for WinForms suite</html>";

        private void trackballController_TextNeeded(object sender, TextNeededEventArgs e)
        { 
            e.Text = text;
        }

Workaround: 

            ChartTrackballController trackballController = new ChartTrackballController();
            trackballController.IsFixedSize = true;
            trackballController.FixedSize = new Size(700, 40);
            trackballController.TextNeeded += trackballController_TextNeeded;
            radChartView1.Controllers.Add(trackballController);

Completed
Last Updated: 26 May 2021 11:01 by ADMIN
Release R2 2021 SP1

            radChartView1.AreaType = ChartAreaType.Cartesian;
            var scatterSeries = new ScatterSeries();
            scatterSeries.DataPoints.Add(new ScatterDataPoint(15, 19));
            scatterSeries.DataPoints.Add(new ScatterDataPoint(18, 10));
            scatterSeries.DataPoints.Add(new ScatterDataPoint(13, 15));
            scatterSeries.DataPoints.Add(new ScatterDataPoint(10, 8));
            scatterSeries.DataPoints.Add(new ScatterDataPoint(5, 12));
            radChartView1.Series.Add(scatterSeries);

            var verticalAxis = radChartView1.Axes.Get<LinearAxis>(1);
            verticalAxis.Minimum = 0.0d;
            verticalAxis.Maximum = 5.0d;
            verticalAxis.MajorStep = 0.5d;
            verticalAxis.LabelFormat = "{0:0.00} m";

            for (var i = verticalAxis.Minimum; i <= verticalAxis.Maximum; i += verticalAxis.MajorStep)
            {
                var annotation1 = new CartesianGridLineAnnotation();
                annotation1.Axis = this.radChartView1.Axes[1] as CartesianAxis;
                annotation1.BorderColor = Color.LightGray;
                annotation1.BorderDashStyle = DashStyle.Solid;
                annotation1.BorderWidth = 1;
                annotation1.Value = i;
                radChartView1.Annotations.Add(annotation1);
            }

Workaround:

        public RadForm1()
        {
            InitializeComponent();

            this.radChartView1.CreateRenderer += radChartView1_CreateRenderer; 
            InitChart();  
        }

        private void radChartView1_CreateRenderer(object sender, ChartViewCreateRendererEventArgs e)
        {
            e.Renderer = new CustomRenderer(e.Area as CartesianArea);
        }

        public class CustomRenderer : CartesianRenderer
        {
            public CustomRenderer(CartesianArea area) : base(area)
            {
            }

            protected override void InitializeAnnotations(AnnotationDrawMode drawMode)
            {
                for (int i = 0; i < this.Area.Annotations.Count; i++)
                {
                    if (this.Area.Annotations[i] is CartesianGridLineAnnotation && this.Area.Annotations[i].DrawMode == drawMode)
                    {
                        this.DrawParts.Add(new CustomCartesianGridLineAnnotationDrawPart(this.Area.Annotations[i] as CartesianGridLineAnnotation, this));
                    }
                }
            }
        }

        public class CustomCartesianGridLineAnnotationDrawPart : CartesianGridLineAnnotationDrawPart
        {
            public CustomCartesianGridLineAnnotationDrawPart(CartesianGridLineAnnotation element, CartesianRenderer renderer) : base(element, renderer)
            {
            }

            public override void Draw()
            {
                FieldInfo fi = typeof(CartesianGridLineAnnotation).GetField("model", BindingFlags.Instance | BindingFlags.NonPublic);
                ChartAnnotationModel model = fi.GetValue(this.Element) as ChartAnnotationModel;
                RectangleF rect = ChartRenderer.ToRectangleF(model.LayoutSlot);
                rect.Offset(this.ViewportOffsetX, this.ViewportOffsetY);
                rect.Offset(new PointF(0,1));
                Graphics graphics = this.Renderer.Surface as Graphics;
                RadGdiGraphics radGraphics = new RadGdiGraphics(graphics);

                Rectangle clipRect = ChartRenderer.ToRectangle(this.Element.View.GetArea<CartesianArea>().AreaModel.PlotArea.LayoutSlot);
                clipRect.Offset((int)this.ViewportOffsetX, (int)this.ViewportOffsetY);
                graphics.SetClip(clipRect);

                GraphicsPath path = new GraphicsPath();
                path.AddLine(rect.Location, new PointF(rect.Right, rect.Bottom));

                BorderPrimitiveImpl border = new BorderPrimitiveImpl(this.Element, null);
                border.PaintBorder(radGraphics, null, path, rect);

                rect.Size = graphics.MeasureString(this.Element.Label, this.Element.Font);
                rect.Offset(this.Element.PositonOffset.Width + 1, this.Element.PositonOffset.Height + 1);

                TextParams tp = new TextParams(); 
                tp.font = this.Element.Font;
                tp.foreColor = this.Element.ForeColor;
                tp.paintingRectangle = new RectangleF(rect.X, rect.Y, rect.Height, rect.Width);
                tp.text = this.Element.Label;

                FillPrimitiveImpl fill = new FillPrimitiveImpl(this.Element, null);
                fill.PaintFill(radGraphics, null, rect);

                radGraphics.DrawString(tp, new SizeF(rect.Height, rect.Width));
            }
        }

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