Winform MsChart 副轴和带状线

Question

我在 Winform 中绘制的 MSChart 有几个问题。

我无法在图表右侧显示轴 Y2 值，这应该是默认值 - 类似于此 question
带状线不会绘制，并且

是否可以将Y1轴和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

您通过将 Crossing 属性设置为 0

来询问 AxisY2 的不当放置

干脆不设置，保持默认double.NaN自动放在右边即可解决问题..:[=27=]

Crossing = double.NaN

要制作带状线显示，需要在其轴的可见范围内开始。将它偏移 10 对您的数据来说太过分了。此外，将其设为黑色可能不是您想要的，除非您只想要一条细线，而不是彩色区域..

StripLines 的基本规则是：

当 Interval = 0 只有一条带状线显示在 IntervalOffset 处 width/height 为 StripWidth
当显示Interval > 0 条条带状线时，会遍及整个轴；除非你有 semi-tranparent 颜色，否则你需要确保 StripWidth < Interval 否则它们之间没有 space！
所有措施都在axis-values；可以使用 StripWidthType 和 IntervalType 设置类型；在使用 DateTime 单位之一时尤其有用。

要使两个 y-axes 的 0 值对齐，您需要调整一个或两个轴的 Minimum and/or Maximum 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。

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