MSChart HitResult AxisLabel

Question

在C＃中使用MS Chart组件并尝试确定项目命中（HitResult）。似乎结果并不总是准确的。如果我有两个图表。右侧始终是柱形图。左侧有时是柱形图，有时是甜甜圈。当左手边是甜甜圈时，从HitResult返回的物品不正确。我的意思是：

namespace WindowsFormsApplication5
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            System.Windows.Forms.DataVisualization.Charting.ChartArea chartArea1 = new System.Windows.Forms.DataVisualization.Charting.ChartArea();
            System.Windows.Forms.DataVisualization.Charting.Legend legend1 = new System.Windows.Forms.DataVisualization.Charting.Legend();
            System.Windows.Forms.DataVisualization.Charting.Series series1 = new System.Windows.Forms.DataVisualization.Charting.Series();
            System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint1 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 10D);
            System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint2 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 20D);
            System.Windows.Forms.DataVisualization.Charting.ChartArea chartArea2 = new System.Windows.Forms.DataVisualization.Charting.ChartArea();
            System.Windows.Forms.DataVisualization.Charting.Legend legend2 = new System.Windows.Forms.DataVisualization.Charting.Legend();
            System.Windows.Forms.DataVisualization.Charting.Series series2 = new System.Windows.Forms.DataVisualization.Charting.Series();
            System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint3 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 10D);
            System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint4 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 20D);
            this.chart1 = new System.Windows.Forms.DataVisualization.Charting.Chart();
            this.chart2 = new System.Windows.Forms.DataVisualization.Charting.Chart();
            ((System.ComponentModel.ISupportInitialize)(this.chart1)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.chart2)).BeginInit();
            this.SuspendLayout();
            // 
            // chart1
            // 
            chartArea1.Name = "ChartArea1";
            this.chart1.ChartAreas.Add(chartArea1);
            legend1.Name = "Legend1";
            this.chart1.Legends.Add(legend1);
            this.chart1.Location = new System.Drawing.Point(13, 13);
            this.chart1.Name = "chart1";
            series1.ChartArea = "ChartArea1";
            series1.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Doughnut;
            series1.Label = "bbb";
            series1.Legend = "Legend1";
            series1.Name = "Series1";
            dataPoint1.AxisLabel = "AAA";
            dataPoint2.AxisLabel = "BBB";
            dataPoint2.Label = "aaa";
            series1.Points.Add(dataPoint1);
            series1.Points.Add(dataPoint2);
            this.chart1.Series.Add(series1);
            this.chart1.Size = new System.Drawing.Size(300, 300);
            this.chart1.TabIndex = 0;
            this.chart1.Text = "chart1";
            this.chart1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.chart1_MouseDown);
            // 
            // chart2
            // 
            chartArea2.Name = "ChartArea1";
            this.chart2.ChartAreas.Add(chartArea2);
            legend2.Name = "Legend1";
            this.chart2.Legends.Add(legend2);
            this.chart2.Location = new System.Drawing.Point(341, 13);
            this.chart2.Name = "chart2";
            series2.ChartArea = "ChartArea1";
            series2.Legend = "Legend1";
            series2.Name = "Series1";
            dataPoint3.AxisLabel = "111";
            dataPoint4.AxisLabel = "2222";
            series2.Points.Add(dataPoint3);
            series2.Points.Add(dataPoint4);
            this.chart2.Series.Add(series2);
            this.chart2.Size = new System.Drawing.Size(300, 300);
            this.chart2.TabIndex = 1;
            this.chart2.Text = "chart2";
            this.chart2.MouseDown += new System.Windows.Forms.MouseEventHandler(this.chart1_MouseDown);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(801, 490);
            this.Controls.Add(this.chart2);
            this.Controls.Add(this.chart1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.chart1)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.chart2)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.DataVisualization.Charting.Chart chart1;
        private System.Windows.Forms.DataVisualization.Charting.Chart chart2;
    }
}

Answer 1

查看Designer代码可以轻松找到问题：您将同一事件连接到两个不同的 Chart控件。

这实际上是避免冗余代码的常用方法;诀窍是将sender转换为正确的控件类型，然后使用结果。

所以你可能用错误的图表做了一次命中测试;你仍然没有显示MouseClick or MouseDown代码，但很可能它包含这样的代码：

HitTestResult hitr = chart1.HitTest(e.X, e.Y);

如果您真的只想使用一个事件，那么您需要的是：

HitTestResult hitr = ((Chart)sender).HitTest(e.X, e.Y);

正如我在上面的评论中所解释的那样，首先不需要有两个Chart控件;添加额外的ChartArea并将要在其中显示的系列分配名称：

ChartArea ca2 = chart1.ChartAreas.Add("ca2");
series1.ChartArea = "ca2";

您可以动态切换ChartTypes，也可以使用CheckBox：

切换

series1.ChartType = cbx_Pie.Checked ? SeriesChartType.Pie : SeriesChartType.Column;

在一个ChartAreas中使用两个（或更多）Chart有一些优势。他们不仅会追上BorderStyle和Background;当调整大小“图表”时，他们也将同时Bitmap与DrawToBitmap相同并且缩放。但这是你的设计......