c# - 为什么自动缩放/滚动不适用于我的图表？

Question

为了简短起见，我查看了 Microsoft 提供的 “WinFormsChartSamples”。我想知道的是如何为图表控件启用缩放和滚动。此处显示的示例非常简短。

using System.Windows.Forms.DataVisualization.Charting;
...

// Set automatic zooming
chart1.ChartAreas["Default"].AxisX.ScaleView.Zoomable = true;
chart1.ChartAreas["Default"].AxisY.ScaleView.Zoomable = true;

// Set automatic scrolling 
chart1.ChartAreas["Default"].CursorX.AutoScroll = true;
chart1.ChartAreas["Default"].CursorY.AutoScroll = true;

...

我试过了，没有任何反应，没有缩放也没有滚动。我尝试了两件事:

1. 在 Form1.Designer.cs 中，我将该信息添加到图表中。

       chartArea1.Name = "ChartArea1";
       chartArea1.CursorX.AutoScroll = true;
       chartArea1.CursorY.AutoScroll = true;
   
       chartArea1.AxisX.ScaleView.Zoomable = true;
       chartArea1.AxisY.ScaleView.Zoomable = true;
   
       this.chart1.ChartAreas.Add(chartArea1);
       this.chart1.Cursor = System.Windows.Forms.Cursors.Cross;
       legend1.Name = "Legend1";
       this.chart1.Legends.Add(legend1);
       this.chart1.Location = new System.Drawing.Point(297, 62);
       this.chart1.Name = "chart1";
       series1.ChartArea = "ChartArea1";
       series1.Legend = "Legend1";
       series1.Name = "Series1";
       this.chart1.Series.Add(series1);
       this.chart1.Size = new System.Drawing.Size(963, 668);
       this.chart1.TabIndex = 6;
       this.chart1.Text = "chart1";
   

2. 我尝试将其直接添加到 Form1.cs 中的构造函数中。

也许重要的是要提到我正在使用 OpenFileDialog 以便向系列添加数据:

private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {

            Stream fileStream = null;
            OpenFileDialog fDialog = new OpenFileDialog();
            fDialog.Title = "Open File..";
            //First the description of the file separated by "|"
            fDialog.Filter = "((ASC files)| *.asc";
            fDialog.InitialDirectory = @"C:\";

            //Show Messagebox if the file was loaded (Source: MSDN - FileDialog.FilterProperty)
            if (fDialog.ShowDialog() == DialogResult.OK)
            {
                MessageBox.Show("The File was loaded successfully.");

                try
                {
                    if ((fileStream = fDialog.OpenFile()) != null)
                    {
                        using (fileStream)
                        {
                            //Insert code for reading the stream here.
                            Spectrum newSpectrum = new Spectrum(chart1.Series.Count, fDialog.FileName,
                               fDialog.SafeFileName, DataHandler.readSpectrumFromFile(fileStream));

                            addSpectrumToView(newSpectrum);

                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }

            }
        }

欢迎任何建议，在此先感谢，

BC++

Answer 1

我认为您实际上真的在寻找这个:

chart1.ChartAreas["Default"].CursorX.IsUserSelectionEnabled = true;
chart1.ChartAreas["Default"].CursorY.IsUserSelectionEnabled = true;

与您已有的结合使用应该效果很好，应该如下所示:

// Set automatic zooming
chart1.ChartAreas["Default"].AxisX.ScaleView.Zoomable = true;
chart1.ChartAreas["Default"].AxisY.ScaleView.Zoomable = true;

// Set automatic scrolling 
chart1.ChartAreas["Default"].CursorX.AutoScroll = true;
chart1.ChartAreas["Default"].CursorY.AutoScroll = true;

// Allow user selection for Zoom
chart1.ChartAreas["Default"].CursorX.IsUserSelectionEnabled = true;
chart1.ChartAreas["Default"].CursorY.IsUserSelectionEnabled = true;