c# - 在 Windows 窗体应用程序折线图中输入过高的数字时的视觉错误

Question

我正在使用 C# 尝试将数字从文本文件输入到折线图中。文本文件中的数字很大，如 -30000。每次我在图表中输入大量数字时，都会出现视觉故障，使图表变黑。我做错了什么还是一个错误？

void ChartLoad()
{
    var chart = LineGraph.ChartAreas[0];

    chart.AxisX.IntervalType = 
    System.Windows.Forms.DataVisualization.Charting.DateTimeIntervalType.Number;

    chart.AxisX.LabelStyle.Format = "";
    chart.AxisY.LabelStyle.Format = "";
    chart.AxisX.LabelStyle.IsEndLabelVisible = true;

    chart.AxisX.Interval = 0.5;
    chart.AxisY.Interval = 10;

    LineGraph.Series[0].IsVisibleInLegend = false;

    LineGraph.Series.Add("Line1");
    LineGraph.Series["Line1"].ChartType = 
    System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
    LineGraph.Series["Line1"].Color = Color.Green;

    LineGraph.Series.Add("Line2");
    LineGraph.Series["Line2"].ChartType = 
    System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
    LineGraph.Series["Line2"].Color = Color.Blue;

    LineGraph.Series["Line1"].Points.AddXY(30000, 30000);
    LineGraph.Series["Line1"].Points.AddXY(-30000, -30000);
}

Answer 1

问题是网格。与您的值范围相比，您的区间非常小。网格非常紧密，以至于它在您的图表上缠上了一层狭窄的网格线。
你可以解决它

电网切换:

 chart.AxisX.MinorGrid.Enabled = false;
 chart.AxisX.MajorGrid.Enabled = false;
 chart.AxisY.MajorGrid.Enabled = false;
 chart.AxisY.MinorGrid.Enabled = false;

或者根据您的值的范围将轴间隔调整为合理的数字。当您将间隔设置为:

 chart.AxisX.Interval = 10000;
 chart.AxisY.Interval = 10000;

这是一种可以为您执行此操作的方法:

private void AddValuesAndAdjustInterval(string series, double xValue, double yValue)
{
    LineGraph.Series[series].Points.AddXY(xValue, yValue);

    var chart = LineGraph.ChartAreas[0];

    double maxValueX = LineGraph.Series[series].Points.Select(x=> x.XValue).Max();
    double minValueX = LineGraph.Series[series].Points.Select(x=> x.XValue).Min();
    double maxValueY = LineGraph.Series[series].Points.SelectMany(x=> x.YValues).Max();
    double minValueY = LineGraph.Series[series].Points.SelectMany(x => x.YValues).Min();
    
    int stepSize = 20; // the smaller this value the larger the grid separation

    chart.AxisX.Interval = (maxValueX - minValueX) / stepSize;
    chart.AxisY.Interval = (maxValueY - minValueY) / stepSize;
}

现在您可以使用它来添加值:

AddValuesAndAdjustInterval("Line1", 30000, 30000);
AddValuesAndAdjustInterval("Line1", -30000, -30000);