c# - Winform MsChart 辅助轴和带状线

Question

我在 Winform 中绘制 MSChart 时遇到一些问题。

1. 我无法获取图表右侧显示的 Y2 轴值，这应该是默认值 - 类似于 question

2. 带状线不会绘制，并且

3. 是否可以将 Y1 和 Y2 轴的零值对齐？

   感谢您的帮助。

       ChartArea TestChartArea = new ChartArea();
   
       public void CreateChartArea()
       {
           TestChartArea.Name = "TestChartArea";
           TestChartArea.BackColor = Color.LightGreen;
           TestChartArea.Position = new ElementPosition { Height = 100, Width = 80, X = 2, Y = 5 };
           //TestChartArea.Position = new ElementPosition { Auto = true };
           TestChartArea.AxisY = new Axis
           {
               Enabled = AxisEnabled.True,
               IsLabelAutoFit = true,
               IsMarginVisible = true,
               LabelStyle = new LabelStyle { Format = "P2", ForeColor = Color.DarkBlue, Font = new Font("Arial", 10, FontStyle.Regular) },
               LineColor = Color.Black,
               MajorGrid = new Grid { LineColor = Color.White, LineDashStyle = ChartDashStyle.Solid },
               MajorTickMark = new TickMark { LineColor = Color.Black }
           };
   
           TestChartArea.AxisY2 = new Axis
           {
               Enabled = AxisEnabled.True,
               IsLabelAutoFit = true,
               IsMarginVisible = true,
               LabelStyle = new LabelStyle { Format = "P2", ForeColor = Color.DarkBlue, Font = new Font("Arial", 10, FontStyle.Regular) },
               LineColor = Color.Transparent,
               MajorGrid = new Grid { LineColor = Color.Yellow, LineDashStyle = ChartDashStyle.Solid },
               MajorTickMark = new TickMark { LineColor = Color.Blue }
   
           };
   
           TestChartArea.AxisX = new Axis
           {
               Enabled = AxisEnabled.True,
               Crossing = 0,
               LineWidth = 1,
               IsLabelAutoFit = true,
               IsMarginVisible = false,
               LabelStyle = new LabelStyle {  Angle=-45,Format = "N0", ForeColor = Color.Black, Font = new Font("Arial", 8, FontStyle.Regular) },
               LineColor = Color.Black,
               MajorGrid = new Grid { LineColor = Color.White, LineDashStyle = ChartDashStyle.Solid },
               MajorTickMark = new TickMark { LineColor = Color.LightGray, Size = 4.0f },
               Name="Spot"
   
           };
       }
   
       public void PlotChart()
       {
           int[] Xseries = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
           double[] AXJO = { 0.0025, 0.0015, -0.001, 0.002, 0.0045, -0.002, -0.003, 0.0001, -0.004, -0.0075 };
           double[] ES = { 0.0020, 0.0010, -0.0005, 0.003, 0.0025, -0.001, -0.0015, 0.0005, -0.0032, -0.006 };
           double[] Diff = new double[10];
   
           // pair return
           for (int i = 0; i < 10; i++)
           {
               Diff[i] = AXJO[i] - ES[i];
           }
   
           TestChart.BackColor = Color.LightGoldenrodYellow;
           TestChart.BackSecondaryColor = Color.LightBlue;
   
           if (TestChart.Series.IsUniqueName("AXJO"))
           {
               TestChart.Series.Add("AXJO");
               TestChart.Series["AXJO"].YAxisType = AxisType.Primary;
               TestChart.Series["AXJO"].Color = Color.Green;
               TestChart.Series["AXJO"].ChartType = SeriesChartType.Line;
               TestChart.Series["AXJO"].Points.DataBindXY(Xseries, AXJO);
               TestChart.Series["AXJO"].ChartArea = "TestChartArea";
           }
   
           if (TestChart.Series.IsUniqueName("ES"))
           {
               TestChart.Series.Add("ES");
               TestChart.Series["ES"].YAxisType = AxisType.Primary;
               TestChart.Series["ES"].Color = Color.Red;
               TestChart.Series["ES"].ChartType = SeriesChartType.Line;
               TestChart.Series["ES"].Points.DataBindXY(Xseries, ES);
               TestChart.Series["ES"].ChartArea = "TestChartArea";
           }
   
           if (TestChart.Series.IsUniqueName("Diff"))
           {
               TestChart.Series.Add("Diff");
               TestChart.Series["Diff"].YAxisType = AxisType.Secondary;
               TestChart.Series["Diff"].Color = Color.Blue;
               TestChart.Series["Diff"].ChartType = SeriesChartType.Line;
               TestChart.Series["Diff"].Points.DataBindXY(Xseries, Diff);
               TestChart.Series["Diff"].ChartArea = "TestChartArea";
           }
       }
   
       public void AddStripLine()
       {
           // add stripline at Diff=zero
           StripLine ZeroDiff = new StripLine();
           ZeroDiff.ForeColor = Color.Black;
           ZeroDiff.BackColor = Color.Black;
           ZeroDiff.StripWidth = 1;
           ZeroDiff.BorderWidth = 2;
           ZeroDiff.Interval = 0;
           ZeroDiff.IntervalOffset = 10;
           TestChart.ChartAreas["TestChartArea"].AxisY2.StripLines.Add(ZeroDiff);
       }
   
       private void button1_Click(object sender, EventArgs e)
       {
           PlotChart();
           AddStripLine();
       }
   }
   

Answer 1

您询问了 AxisY2 的不需要的放置位置通过设置其 Crossing属性至0

只是不设置它，因此将其保留为默认值 double.NaN自动将其放置在右侧将解决问题......:

Crossing = double.NaN

---

要显示带状线，它需要在其轴的可见范围内开始。将其偏移 10 对于您的数据来说太过分了。而且将其设置为黑色可能也不是您想要的，除非您只想要一条细线，而不是彩色区域..

StripLines的基本规则是:

• 何时 Interval = 0 IntervalOffset 处仅显示一条带状线宽度/高度为 StripWidth
• 何时 Interval > 0显示许多带状线，跨越整个轴；除非你有半透明的颜色，否则你需要确保 StripWidth < Interval否则它们之间就没有空间!
• 所有度量都在轴值中；类型可以通过 StripWidthType 设置和IntervalType ;特别是在使用 DateTime 之一时很有用单位。

---

要使两个 y 轴的 0 值对齐，您需要调整 Minimum和/或 Maximum一个或两个轴的值。这可能有点棘手，您可能需要查看数据并完全控制间距和放置轴标签。