[TeeChart] Custom Label 표시하기

차트내부에 Custom Label 을 표시하는 방법입니다.

예제는 ColorLine 을 긋고 그옆에 Label 을 표시합니다.

using Steema.TeeChart.Export;
using Steema.TeeChart.Styles;
using Steema.TeeChart.Tools;

namespace Win.TeeChartLegendClickTest
{
    public partial class ChartForm : Form
    {
        public ChartForm()
        {
            InitializeComponent();

            // Set SampleData
            for (int i = 0; i < 10; i++)
            {
                Points points = new Points(this.tChart.Chart);
                points.XValues.DateTime = true;

                points.FillSampleValues(20);
            }

            this.tChart.AfterDraw += TChart1_AfterDraw;

            // X Custom Line
            ColorLine colorLinex = new ColorLine();
            colorLinex.AllowDrag = false;
            colorLinex.Pen.Color = Color.Black;
            colorLinex.Axis = this.tChart.Axes.Bottom;
            colorLinex.Pen.Style = Steema.TeeChart.Drawing.DashStyle.Solid;
            colorLinex.Pen.EndCap = Steema.TeeChart.Drawing.LineCap.Round;
            colorLinex.Pen.DashCap = Steema.TeeChart.Drawing.DashCap.Round;
            colorLinex.Value = DateTime.Now.AddDays(10).ToOADate();

            this.tChart.Tools.Add(colorLinex);
        }

        private void TChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.IGraphics3D g)
        {
            // Custom Label
            g.ClearClipRegions();
            g.Font.Name = "Arial";
            g.Font.Color = Color.Black;

            int x = this.tChart.Axes.Bottom.CalcPosValue(DateTime.Now.AddDays(10).ToOADate());
            int y = this.tChart.Axes.Left.CalcPosValue(this.tChart.Axes.Left.Minimum);

            string text = "TEST";
            int margin = (int)Math.Ceiling(g.MeasureString(g.Font, Text).Height);

            g.RotateLabel(x + margin, y, text, 90);
        }
}

After_Draw 이벤틀 이용해 Label 을 표시합니다.

실행결과

TEST 문자열이 ColorLine 옆으로 표시됩니다.

[Source]
https://github.com/kei-soft/Win.TeeChartTest