C# WinForms MSChart（StackedBar - 甘特图）带 Y 轴日期限制

Question

更新：据我所知，这与日期本身无关。 这只是图表上有一个长条的情况，当专注于它的一小段（日期/时间、短值范围等）时，它会停止为条着色。 除了对它视而不见之外，仍然不知道为什么或如何解决它。

我一直在尝试解决一个涉及堆叠图表和日期限制的奇怪小错误。 假设您将 Y 轴设置为日期，X 轴是项目，您将条形用作项目完成、项目截止日期和项目逾期。

现在，如果您将 Y 轴上显示的最小和最大日期设置为相隔几天，在预计持续数月的项目中，您将看到问题。 该条失去了颜色，但如果您增加最小值和最大值之间的差距，那么问题就会消失。

以下是涉及的代码片段：

    private void _Gantt_Load(object sender, EventArgs e)
    {
        chart1.MouseUp                      += new MouseEventHandler(MouseHandler);

        _dtpGraphStart.ValueChanged         += new EventHandler(DateTimeHandler);
        _dtpGraphEnd.ValueChanged           += new EventHandler(DateTimeHandler);

        string pOneName = "Project 1";
        string pTwoName = "Project 2";
        DateTime pOneStart = new DateTime(2011, 01, 01, 0, 0, 0);
        DateTime pTwoStart = new DateTime(2011, 02, 01, 12, 0, 0);
        DateTime pOneEnd = new DateTime(2011, 01, 01, 15, 0, 0);
        DateTime pTwoEnd = new DateTime(2011, 07, 01, 7, 0, 0);
        double pOneTotal = (pOneEnd - pOneStart).TotalDays;
        double pTwoTotal = (pTwoEnd - pTwoStart).TotalDays;
        double pOnePercent = 75;
        double pTwoPercent = 50;
        double pOneComplete = (pOnePercent / 100.0f) * pOneTotal;
        double pTwoComplete = (pTwoPercent / 100.0f) * pTwoTotal;

        chart1.Series["StartSeries"].Points.AddXY(pOneName, pOneStart);
        chart1.Series["StartSeries"].Points.AddXY(pTwoName, pTwoStart);
        chart1.Series["ProjectDurationSeries"].Points.AddXY(pOneName, pOneComplete);
        chart1.Series["ProjectDurationSeries"].Points.AddXY(pTwoName, pTwoComplete);
        chart1.Series["ProjectDurationSeries"].Points[0].Tag = "TestOne";
        chart1.Series["ProjectDurationSeries"].Points[1].Tag = "TestTwo";
        chart1.Series["ProjectRemainingSeries"].Points.AddXY(pOneName, pOneTotal - pOneComplete);
        chart1.Series["ProjectRemainingSeries"].Points.AddXY(pTwoName, pTwoTotal - pTwoComplete);
        chart1.Series["ProjectRemainingSeries"].Points[0].Tag = "TestCompleteOne";
        chart1.Series["ProjectRemainingSeries"].Points[1].Tag = "TestCompleteTwo";
        chart1.ChartAreas[0].AxisY.Minimum = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day,  0,  0,  0).ToOADate();
        chart1.ChartAreas[0].AxisY.Maximum = new DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 23, 59, 59).ToOADate();
        chart1.DataBind();

        _dtpGraphEnd.MinDate = _dtpGraphStart.Value;
        _dtpGraphStart.MaxDate = _dtpGraphEnd.Value;
    }

    private void DateTimeHandler(object sender, EventArgs e)
    {
        DateTimePicker dtp = (DateTimePicker)sender;

        switch (dtp.Name)
        {
            case "_dtpGraphStart":
                chart1.ChartAreas[0].AxisY.Minimum = new DateTime(dtp.Value.Year, dtp.Value.Month, dtp.Value.Day, 0, 0, 0).ToOADate();
                _dtpGraphEnd.MinDate = dtp.Value;
                break;
            case "_dtpGraphEnd":
                chart1.ChartAreas[0].AxisY.Maximum = new DateTime(dtp.Value.Year, dtp.Value.Month, dtp.Value.Day, 23, 59, 59).ToOADate();
                _dtpGraphStart.MaxDate = dtp.Value;
                break;
        }

        if ((chart1.ChartAreas[0].AxisY.Maximum - chart1.ChartAreas[0].AxisY.Minimum) < 3)
            chart1.ChartAreas[0].AxisY.LabelStyle.Format = "T";
        if (((chart1.ChartAreas[0].AxisY.Maximum - chart1.ChartAreas[0].AxisY.Minimum) > 3) 
            && ((chart1.ChartAreas[0].AxisY.Maximum - chart1.ChartAreas[0].AxisY.Minimum) < 30))
            chart1.ChartAreas[0].AxisY.LabelStyle.Format = "dd/MM";
        if ((chart1.ChartAreas[0].AxisY.Maximum - chart1.ChartAreas[0].AxisY.Minimum) > 30)
            chart1.ChartAreas[0].AxisY.LabelStyle.Format = "MM/yyyy";
    }

上面的项目从 01/01/2011 00:00:00 到 01/01/2011 15:00:00 和 01/02/2011 12:00:00 到 01/07/2011 07:00:00 .

最初的日期限制是在今天的日期，没有特别的原因。

这是显示问题的图像。 除了较小的属性更改之外，没有其他代码与此图表显示的内容有关，但为了彻底，我将从设计器文件中添加以下代码。

        chartArea1.AxisX.MajorGrid.Enabled = false;
        chartArea1.AxisY.InterlacedColor = System.Drawing.Color.Lime;
        chartArea1.AxisY.LabelStyle.Format = "T";
        chartArea1.AxisY.MajorGrid.Enabled = false;
        chartArea1.Name = "ChartArea1";
        this.chart1.ChartAreas.Add(chartArea1);
        this.chart1.Location = new System.Drawing.Point(0, 0);
        this.chart1.Name = "chart1";
        series1.ChartArea = "ChartArea1";
        series1.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
        series1.Color = System.Drawing.Color.White;
        series1.Name = "StartSeries";
        series2.BorderColor = System.Drawing.Color.Black;
        series2.BorderWidth = 2;
        series2.ChartArea = "ChartArea1";
        series2.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
        series2.Color = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte)(192)))), ((int)(((byte)(0)))));
        series2.EmptyPointStyle.Color = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte)(192)))), ((int)(((byte)(0)))));
        series2.Name = "ProjectDurationSeries";
        series3.BackHatchStyle = System.Windows.Forms.DataVisualization.Charting.ChartHatchStyle.ForwardDiagonal;
        series3.BackSecondaryColor = System.Drawing.Color.White;
        series3.BorderColor = System.Drawing.Color.Black;
        series3.BorderWidth = 2;
        series3.ChartArea = "ChartArea1";
        series3.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
        series3.Color = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(128)))), ((int)(((byte)(255)))));
        series3.Name = "ProjectRemainingSeries";
        series4.BackHatchStyle = System.Windows.Forms.DataVisualization.Charting.ChartHatchStyle.ForwardDiagonal;
        series4.BorderColor = System.Drawing.Color.Black;
        series4.BorderWidth = 2;
        series4.ChartArea = "ChartArea1";
        series4.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
        series4.Color = System.Drawing.Color.Red;
        series4.Name = "Series4";
        this.chart1.Series.Add(series1);
        this.chart1.Series.Add(series2);
        this.chart1.Series.Add(series3);
        this.chart1.Series.Add(series4);
        this.chart1.Size = new System.Drawing.Size(727, 339);
        this.chart1.TabIndex = 0;
        this.chart1.Text = "chart1";

下面是显示问题的图像： http://i55.tinypic.com/27zkv0w.jpg

Answer 1

chartArea1.AxisX.MajorGrid.Enabled = false;
chartArea1.AxisY.InterlacedColor = System.Drawing.Color.Lime;
chartArea1.AxisY.LabelStyle.Format = "T";
chartArea1.AxisY.MajorGrid.Enabled = false;
chartArea1.Name = "ChartArea1";
this.chart1.ChartAreas.Add(chartArea1);
this.chart1.Location = new System.Drawing.Point(0, 0);
this.chart1.Name = "chart1";
series1.ChartArea = "ChartArea1";
series1.ChartType =
System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
series1.Color = System.Drawing.Color.White;
series1.Name = "StartSeries";
series2.BorderColor = System.Drawing.Color.Black;
series2.BorderWidth = 2;
series2.ChartArea = "ChartArea1";
series2.ChartType = 
System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
series2.Color = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte) 
(192)))), ((int)(((byte)(0)))));
series2.EmptyPointStyle.Color = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), 
((int)(((byte)(192)))), ((int)(((byte)(0)))));
series2.Name = "ProjectDurationSeries";
series3.BackHatchStyle = 
System.Windows.Forms.DataVisualization.Charting.ChartHatchStyle.ForwardDiagonal;
series3.BackSecondaryColor = System.Drawing.Color.White;
series3.BorderColor = System.Drawing.Color.Black;
series3.BorderWidth = 2;
series3.ChartArea = "ChartArea1";
series3.ChartType = 
System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
series3.Color = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)
(((byte)(128)))), ((int)(((byte)(255)))));
series3.Name = "ProjectRemainingSeries";
series4.BackHatchStyle = 
System.Windows.Forms.DataVisualization.Charting.ChartHatchStyle.ForwardDiagonal;
series4.BorderColor = System.Drawing.Color.Black;
series4.BorderWidth = 2;
series4.ChartArea = "ChartArea1";
series4.ChartType = 
System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedBar;
series4.Color = System.Drawing.Color.Red;
series4.Name = "Series4";
this.chart1.Series.Add(series1);
this.chart1.Series.Add(series2);
this.chart1.Series.Add(series3);
this.chart1.Series.Add(series4);
this.chart1.Size = new System.Drawing.Size(727, 339);
this.chart1.TabIndex = 0;
this.chart1.Text = "chart1";