Question

我目前有一个TChart，我想引入一个可拖动的水平线，它可以改变线下方点的颜色。我选择使用ColorLine用于此目的，但该行不会出现在TChart中。我使用正确的TChart工具还是我错过了什么？

以下是我当前代码的精简版。

public class testClass
{
    private ColorLine line;
    private double lineYVal = 5;
    private TChart savedChart;

    public testClass()
    {
        line = new Colorline();
        line.AllowDrag = true;
        line.Pen.Color = Color.Red;
        line.EndDragLine += lineDragHandler;
    }

    public void foo(TChart chart)          //chart is prepopulated with datapoints from 0->10
    {
        savedChart = chart;
        //existing code which assigns colors
        chart.Series[0].ColorRange(chart.Series[0].YValues, double.MinValue, lineYVal, Color.Red);
        chart.Series[0].ColorRange(chart.Series[0].YValues, lineYVal, double.MaxValue, Color.Blue);

        //my attempt to add a line
        chart.Tools.Add(line);
        line.Active = true;
        line.Axis = chart.Axes.Left;
        line.Value = lineYVal;
    }

    private void lineDragHandler(object sender)
    {
        lineYVal = line.Value;
        savedChart.Tools.Clear();     //remove existing line from chart
        foo(savedChart);              //redo colors and re-add line
    }
}

Answer 1

以下代码在这里对我有用。如果问题仍然存在，请发送a Short, Self Contained, Correct (Compilable), Example project以重现此问题。您可以在www.steema.net/upload发布文件。

using Steema.TeeChart;
using Steema.TeeChart.Styles;
using Steema.TeeChart.Tools;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
      InitializeChart();
    }

    private void InitializeChart()
    {
      testClass();

      //existing code which assigns colors
      tChart1.Series.Add(new Steema.TeeChart.Styles.Bar()).FillSampleValues();

      tChart1.Series[0].ColorRange(tChart1.Series[0].YValues, double.MinValue, lineYVal, Color.Red);
      tChart1.Series[0].ColorRange(tChart1.Series[0].YValues, lineYVal, double.MaxValue, Color.Blue);

      //my attempt to add a line
      tChart1.Tools.Add(line);
      line.Active = true;
      line.Axis = tChart1.Axes.Left;
      line.Value = lineYVal;
    }

    private ColorLine line;
    private double lineYVal = 5;
    private TChart savedChart;

    public void testClass()
    {
      line = new ColorLine();
      line.AllowDrag = true;
      line.Pen.Color = Color.Red;
      line.EndDragLine += lineDragHandler;
    }

    public void foo(TChart chart)          //chart is prepopulated with datapoints from 0->10
    {
      savedChart = chart;
      //existing code which assigns colors
      chart.Series[0].ColorRange(chart.Series[0].YValues, double.MinValue, lineYVal, Color.Red);
      chart.Series[0].ColorRange(chart.Series[0].YValues, lineYVal, double.MaxValue, Color.Blue);

      //my attempt to add a line
      chart.Tools.Add(line);
      line.Active = true;
      line.Axis = chart.Axes.Left;
      line.Value = lineYVal;
    }

    private void lineDragHandler(object sender)
    {
      lineYVal = line.Value;
      if (savedChart != null)
      {
        savedChart.Tools.Clear();   //remove existing line from chart
        foo(savedChart);              //redo colors and re-add line
      }
      else
      {
        foo(tChart1);
      }
    }

  }
}

Answer 2

事实证明，当正确添加该行时，我用来显示图表的代码没有正确更新图表，并且在将图表传递到我的高亮显示功能之前显示了该图表的版本。

C＃ColorLine没有出现在TChart中

2 个答案: