如何在填满图形但不是无限的mschart上绘制垂直线? [英] How to draw vertical line on mschart that fills graph but isn't infinite?

问题描述

我正在尝试绘制锚定到一个点的垂直线.我尝试使用固定的Y轴高度绘制线条，但未正确居中.所以现在我有一条无限的线，但是我想要的是这样的线，就像这样填充图形

I am trying to draw a vertical line that is anchored to a point. I tried to use the height of my Y axis which is fixed to draw the line, but it wasn't centered correctly. So right now I have an infinite line, but that I want is the line to just fill the graph like so

VerticalLineAnnotation lineannot = new VerticalLineAnnotation();
lineannot.AnchorDataPoint = chart.Series[item].Points.Last();
lineannot.LineColor = Color.Red;
lineannot.Width = 3;
lineannot.Visible = true;
lineannot.IsInfinitive = true;
chart.Annotations.Add(lineannot);

推荐答案

IsInfinitive由ClipToChartArea补充；您可以将行设置为像这样裁剪到ChartArea:

IsInfinitive is complemented by ClipToChartArea; you can set the line to be clipped to a ChartArea like this:

lineannot.ClipToChartArea = chart.ChartAreas[item].Name; 

假定item是正确的区域名称或索引. 请注意，ClipToChartArea使用图表区域的名称！

assuming item is the right area name or index.. Note that ClipToChartArea takes the name of the chart area!

这是最简单的方法.

还可以直接控制注释的位置和大小:

It is also possible to control an annotation's position and size directly:

// Note that directly after adding points this will return NaN:
double maxDataPoint = chart1.ChartAreas[0].AxisY.Maximum;
double minDataPoint = chart1.ChartAreas[0].AxisY.Minimum;

LineAnnotation annotation2 = new LineAnnotation();
annotation2.IsSizeAlwaysRelative = false;
annotation2.AxisX = chart1.ChartAreas[0].AxisX;
annotation2.AxisY = chart1.ChartAreas[0].AxisY;
annotation2.AnchorY = minDataPoint;
annotation2.Height = maxDataPoint - minDataPoint;;
annotation2.Width = 0;
annotation2.LineWidth = 2;
annotation2.StartCap = LineAnchorCapStyle.None;
annotation2.EndCap = LineAnchorCapStyle.None;
annotation2.AnchorX = 21;  // <- your point
annotation2.LineColor = Color.Pink; // <- your color
chart1.Annotations.Add(annotation2);

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