c#—devexpress chartcontrol 鼠标点击chart上的点事件，鼠标移动显示值

Winform程序。

ChartControl.RuntimeHitTesting属性一定要设为True。

Line Series markers的Visible一定要弄成True。CalcHitInfo的SeriesPoint一直为null，最后跑到devexpress support center上问的。我的dev版本是13.1.5，设置属性的方法是Series->View->MarkerVisibility。有的版本可能是Series -> LineMarkerOptions -> Visible。

我的是以曲线图Spline为例，下面就是代码。

1.鼠标点击点弹出Messagebox

        private void chartControl4_MouseClick(object sender, MouseEventArgs e)
        {
            ChartHitInfo hitInfo = chartControl4.CalcHitInfo(e.Location);
            if (hitInfo.SeriesPoint != null)
            {
                MessageBox.Show(hitInfo.SeriesPoint.Values[0].ToString());
            }
        }

2.鼠标移动用ToolTipController显示值

外面定义

ToolTipController toolTipController = new ToolTipController(); 

下面是dev的源码

        private void chartControl4_MouseMove(object sender, MouseEventArgs e)
        {
            ChartHitInfo hitInfo = chartControl4.CalcHitInfo(e.Location);
            StringBuilder builder = new StringBuilder();
            if (hitInfo.InDiagram)
                builder.AppendLine("In diagram");
            if (hitInfo.InNonDefaultPane)
                builder.AppendLine("In non-default pane: " + hitInfo.NonDefaultPane.Name);
            if (hitInfo.InAxis)
            {
                builder.AppendLine("In axis: " + hitInfo.Axis.Name);
                if (hitInfo.AxisLabelItem != null)
                    builder.AppendLine("  Label item: " + hitInfo.AxisLabelItem.Text);
                if (hitInfo.AxisTitle != null)
                    builder.AppendLine("  Axis title: " + hitInfo.AxisTitle.Text);
            }
            if (hitInfo.InChartTitle)
                builder.AppendLine("In chart title: " + hitInfo.ChartTitle.Text);
            if (hitInfo.InLegend)
                builder.AppendLine("In legend");
            if (hitInfo.InSeries)
                builder.AppendLine("In series: " + ((Series)hitInfo.Series).Name);
            if (hitInfo.InSeriesLabel)
            {
                builder.AppendLine("In series label");
                builder.AppendLine("  Series: " + ((Series)hitInfo.Series).Name);
            }
            if (hitInfo.SeriesPoint != null)
            {
                builder.AppendLine("  Argument: " + hitInfo.SeriesPoint.Argument);
                if (!hitInfo.SeriesPoint.IsEmpty)
                    builder.AppendLine("  Value: " + hitInfo.SeriesPoint.Values[0]);
            }
            if (builder.Length > 0)
                toolTipController.ShowHint("Hit-testing results:\n" + builder.ToString(), chartControl4.PointToScreen(e.Location));
            else
                toolTipController.HideHint();
        }

        private void chartControl4_MouseLeave(object sender, EventArgs e)
        {
            toolTipController.HideHint();
        }

3.另一种鼠标移动显示信息的方法，用CustomDrawCrosshair事件，从别人那里学习的。这种还可以显示图片。

        private void chartControl4_CustomDrawCrosshair(object sender, CustomDrawCrosshairEventArgs e)
        {

            foreach (CrosshairElement element in e.CrosshairElements)
            {
                SeriesPoint point = element.SeriesPoint;
                element.LabelElement.MarkerImage = Image.FromFile(@"F:\Resources\Add.png");// 设置图片路径
                element.LabelElement.MarkerImageSizeMode = ChartImageSizeMode.Stretch;
                element.LabelElement.MarkerSize = new Size(100, 100); // 大小
                element.LabelElement.Text = point.Values[0].ToString();//显示要显示的文字
            }
        }

这里有devexpress用CustomDrawCrosshair事件显示点信息的DemoHow to: Show a Tooltip with a Series Point's Data