C# Chart 控件实现局部放大与缩放完整指南

/// <summary>
/// 初始化 Chart 缩放功能
/// </summary>
public static void InitChart(System.Windows.Forms.DataVisualization.Charting.Chart chart1)
{
    // 获取第一个图表区域
    var area = chart1.ChartAreas[0];
    
    // 1. 设置 X 轴游标属性
    area.CursorX.Interval = 0;
    area.CursorX.IsUserEnabled = true;             // 显示光标
    area.CursorX.IsUserSelectionEnabled = true;   // 允许用户划选

    // Y 轴同理可配置 (如需双向缩放)
    // area.CursorY.IsUserEnabled = true;
    // area.CursorY.IsUserSelectionEnabled = true;

    // 2. 绑定鼠标点击事件，用于后续处理右键重置
    chart1.MouseClick += new System.Windows.Forms.MouseEventHandler(Chart_MouseClick);
}

static void Chart_MouseClick(object sender, MouseEventArgs e)
{
    if (!(sender is System.Windows.Forms.DataVisualization.Charting.Chart chart))
        return;

    // 右键恢复事件
    if (e.Button == System.Windows.Forms.MouseButtons.Right)
    {
        // 重置所有缩放动作，恢复到最初状态
        chart.ChartAreas[0].AxisX.ScaleView.ZoomReset(0);
        // 如果 Y 轴也开启了独立缩放，需同步重置
        // chart.ChartAreas[0].AxisY.ScaleView.ZoomReset(0);
    }
}

private void chart1_MouseEnter(object sender, EventArgs e)
{
    // 当鼠标进入控件时，绑定滚轮事件
    this.chart1.MouseWheel += new MouseEventHandler(chart1_MouseWheel);
}

private void chart1_MouseWheel(object sender, MouseEventArgs e)
{
    var chart = (System.Windows.Forms.DataVisualization.Charting.Chart)sender;
    var axis = chart.ChartAreas[0].AxisX;
    var view = axis.ScaleView;

    // Delta > 0 表示滚轮向上（通常意味着放大/查看更多细节，此处根据业务逻辑定义）
    // 这里演示：向上滚动增加 Size (缩小画面，看全貌)，向下滚动减少 Size (放大画面，看细节)
    // 注意：不同版本 API 对滚轮方向敏感度可能不同，可根据需求反转逻辑
    if (e.Delta > 0) 
    {
        // 向上滚动：扩大显示范围 (Size 增加)
        if (view.Size < 100) 
        {
            view.Size += 2;
        }
    }
    else 
    {
        // 向下滚动：缩小显示范围 (Size 减少，即局部放大)
        if (view.Size > 1)
        {
            view.Size -= 2;
        }
    }
}

#region 表格参数设置
// 1. 图表标题
Title title = new Title();
title.Font = new System.Drawing.Font("宋体", 12F);
title.Text = "压机曲线波动分析";
chart1.Titles.Add(title);

var area = chart1.ChartAreas[0];

// 2. 设置坐标轴标题
area.AxisX.Title = "位 移 / mm";
area.AxisY.Title = "压 力 / Kg";
area.AxisX.TitleFont = new System.Drawing.Font("宋体", 12F);
area.AxisY.TitleFont = new System.Drawing.Font("宋体", 12F);

// 3. 设置极值与间距
area.AxisX.Minimum = 0; area.AxisX.Maximum = 100;
area.AxisY.Minimum = 0; area.AxisY.Maximum = 200;
area.AxisX.Interval = 1;      // 主刻度间距
area.AxisY.Interval = 5;      // 主刻度间距

// 4. 网格线设置
area.AxisX.MajorGrid.Enabled = true;
area.AxisX.MajorGrid.LineColor = System.Drawing.Color.Gainsboro;
area.AxisX.MajorGrid.LineDashStyle = System.Windows.Forms.DataVisualization.Charting.ChartDashStyle.Dash; // 虚线
area.AxisX.MajorGrid.Interval = 10;

area.AxisY.MajorGrid.Enabled = true;
area.AxisY.MajorGrid.LineColor = System.Drawing.Color.Gainsboro;
area.AxisY.MajorGrid.LineDashStyle = System.Windows.Forms.DataVisualization.Charting.ChartDashStyle.Dash;
area.AxisY.MajorGrid.Interval = 20;

// 5. 滚动条配置
area.AxisX.ScrollBar.Enabled = true;
area.AxisX.ScrollBar.Size = 5; // 滚动条高度比例
area.AxisX.ScrollBar.IsPositionedInside = true; // 嵌入坐标轴内部
#endregion

#region 各个曲线参数设置
// 曲线类型 (如 Spline 平滑曲线)
chart1.Series[0].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Spline;
chart1.Series[0].BorderWidth = 1;
chart1.Series[0].Color = System.Drawing.Color.Blue;

// 图例名称
chart1.Series[0].LegendText = "随机抽取曲线1";
chart1.Series[0].IsVisibleInLegend = true;

// 悬浮提示 (Tooltip)
chart1.Series[0].LegendToolTip = "这是第一条曲线的备注信息";

// 显示数据标签 (可选)
// chart1.Series[0].IsValueShownAsLabel = true;
#endregion