这是不可能的GridLines
因为它们总是在固定的位置绘制Interval
间距。这是通过在中绘制线条来解决问题的示例xxxPaint
event..
首先我们声明一个止损值列表GridLines
我们想要:
List<double> stops = new List<double>();
然后我们准备图表:
AddPoints();
ChartArea ca = chart1.ChartAreas[0];
ca.AxisX.Minimum = 0; // optional
ca.AxisX.MajorGrid.Enabled = false;
ca.AxisX.MajorTickMark.Enabled = false;
ca.AxisX.LabelStyle.Enabled = false;
stops.AddRange(new[] { 0, 15, 45, 50.5, 65, 90, 100 });
请注意我已经添加了一项额外价值 (50.5
)来展示我们如何绘制GridLines
即使没有DataPoints
are!
然后我们编码PostPaint
event:
private void chart1_PostPaint(object sender, ChartPaintEventArgs e)
{
Graphics g = e.ChartGraphics.Graphics;
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
ChartArea ca = chart1.ChartAreas[0];
Font font = ca.AxisX.LabelStyle.Font;
Color col = ca.AxisX.MajorGrid.LineColor;
int padding = 10; // pad the labels from the axis
int y0 = (int)ca.AxisY.ValueToPixelPosition(ca.AxisY.Minimum);
int y1 = (int)ca.AxisY.ValueToPixelPosition(ca.AxisY.Maximum);
foreach (int sx in stops)
{
int x = (int)ca.AxisX.ValueToPixelPosition(sx);
using (Pen pen = new Pen(col))
g.DrawLine(pen, x, y0, x, y1);
string s = sx + "";
if (ca.AxisX.LabelStyle.Format != "")
s = string.Format(ca.AxisX.LabelStyle.Format, s);
SizeF sz = g.MeasureString(s, font, 999);
g.DrawString(s, font, Brushes.Black, (int)(x - sz.Width / 2) , y0 + padding);
}
这是结果:
![enter image description here](https://i.stack.imgur.com/xck4y.png)
请注意,大部分代码都在PostPaint
活动只是准备;线条和标签的两个实际绘图调用是普通的GDI+
方法..
请注意我已经添加了DataPoint
循环中每 10 个点的标签以显示我们所在的位置:
chart1.Series[0].Points.AddXY(i, i);
if (i%10 == 0) chart1.Series[0].Points[i].Label = "#VAL / #VALY";