图表 - 放大以显示更精确的数据

Question

所以我现在有一张图表，其中包含大量数据。 这可以在下图中看到：

基本上我希望用户能够放大并进一步查看数据。 正如您所知，它目前已经携带了大量数据。

我希望用户能够缩放并查看更精确的内容。

protected void drawChart()
    {


        DataTable dt = new DataTable();
        dt.Clear();

        foreach (DataGridViewColumn col in dataGridView1.Columns)
        {
            dt.Columns.Add(col.HeaderText);
        }

        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            DataRow dRow = dt.NewRow();
            foreach (DataGridViewCell cell in row.Cells)
            {
                dRow[cell.ColumnIndex] = cell.Value;
            }
            dt.Rows.Add(dRow);
        }


        chart1.DataBind();

        chart1.DataSource = dt;
        chart1.ChartAreas[0].AxisX.IntervalAutoMode = 
                             IntervalAutoMode.VariableCount;
        chart1.ChartAreas[0].AxisX.LabelStyle.Angle = 90;
        chart1.Series["Series1"].XValueMember = "Date/Time";

        chart1.Series["Series1"].YValueMembers = "HeartRate";

        chart1.Series["Series2"].ChartType = SeriesChartType.Line;
        chart1.Series["Series2"].YValueMembers = "Speed";

        chart1.Series["Series3"].ChartType = SeriesChartType.Line;
        chart1.Series["Series3"].YValueMembers = "Cadence";

        chart1.Series["Series4"].ChartType = SeriesChartType.Line;
        chart1.Series["Series4"].YValueMembers = "Altitude";

        chart1.Series["Series5"].ChartType = SeriesChartType.Line;
        chart1.Series["Series5"].YValueMembers = "Pressure";

        chart1.Series["Series6"].ChartType = SeriesChartType.Line;
        chart1.Series["Series6"].YValueMembers = "Power";

        chart1.Series["Series1"].LegendText = "Heart Rate";

        chart1.Series["Series1"].ToolTip =
         "Heart Rate:#VALY\nAverage:#AVG\nMinimum:#MIN\nMaximum:#MAX ";

        chart1.Series["Series2"].LegendText = "Speed";
        chart1.Series["Series2"].ToolTip = 
         "Speed(KM/H):#VALY\nAverage:#AVG\nMaximum:#MAX";

        chart1.Series["Series3"].LegendText = "Cadence";
        chart1.Series["Series3"].ToolTip = 
         "Cadence:#VALY\nAverage:#AVG\nMaximum:#MAX";

        chart1.Series["Series4"].LegendText = "Altitude";
        chart1.Series["Series4"].ToolTip =  
         "Altitude(KM/H):#VALY\nAverage:#AVG\nMaximum:#MAX";

        chart1.Series["Series5"].LegendText = "Pressure";
        chart1.Series["Series5"].ToolTip = 
         "Pressure:#VALY\nAverage:#AVG\nMaximum:#MAX";

        chart1.Series["Series6"].LegendText = "Power";
        chart1.Series["Series6"].ToolTip = 
          "Power:#VALY\nAverage:#AVG\nMaximum:#MAX";

        // add the highlight series after databinding!! (**)
        Series sz = chart1.Series.Add("Interval");
        sz.ChartType = SeriesChartType.Point;
        sz.Color = Color.Red;
        sz.BorderWidth = 3;

        foreach (DataPoint dp in chart1.Series[0].Points)
        {
            if (dp.YValues[0] == 0) sz.Points.AddXY(dp.XValue, 0);
        }

        // allow zooming: (Taw's edit)
        chart1.Series["Series1"].AxisX.ScaleView.Zoomable = true;
        chart1.Series["Series1"].CursorX.AutoScroll = true;
        chart1.Series["Series1"].CursorX.IsUserSelectionEnabled = true;          


   }

Answer 1

这很简单，但确实需要一些设置来完成这个技巧：

ChartArea CA = chart1.ChartAreas[0];  // quick reference
CA.AxisX.ScaleView.Zoomable = true;
CA.CursorX.AutoScroll = true;
CA.CursorX.IsUserSelectionEnabled = true;

现在，用户可以将鼠标拖动到感兴趣的区域上，然后将其放大以填充图表：

请注意水平滚动条左侧的小按钮：这会重置范围。

与Chart一样常见的问题是结构不完整的文档......