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gPath.AddLines(ArrowPoints);
gPath.AddLine(ArrowPoints[2].X, topLeftPoint.Y, rectX2, topLeftPoint.Y);
gPath.AddArc(rectX2 - arcRadius, topLeftPoint.Y, arcDia, arcDia, 270, 90);
gPath.AddLine(bottomRightPoint.X, rectY1, bottomRightPoint.X, rectY2);
gPath.AddArc(rectX2 - arcRadius, rectY2 - arcRadius, arcDia, arcDia, 0, 90);
gPath.AddLine(rectX2, bottomRightPoint.Y, rectX1, bottomRightPoint.Y);
}
else
{
gPath.AddLine(rectX1, topLeftPoint.Y, rectX2, topLeftPoint.Y);
gPath.AddArc(rectX2 - arcRadius, topLeftPoint.Y, arcDia, arcDia, 270, 90);
gPath.AddLine(bottomRightPoint.X, rectY1, bottomRightPoint.X, rectY2);
gPath.AddArc(rectX2 - arcRadius, rectY2 - arcRadius, arcDia, arcDia, 0, 90);
gPath.AddLine(rectX2, bottomRightPoint.Y, ArrowPoints[0].X, bottomRightPoint.Y);
gPath.AddLines(ArrowPoints);
gPath.AddLine(ArrowPoints[2].X, bottomRightPoint.Y, rectX1, bottomRightPoint.Y);
gPath.AddArc(topLeftPoint.X, rectY2 - arcRadius, arcDia, arcDia, 90, 90);
gPath.AddLine(topLeftPoint.X, rectY2, topLeftPoint.X, rectY1);
gPath.AddArc(topLeftPoint.X, topLeftPoint.Y, arcDia, arcDia, 180, 90);
}
gPath.CloseFigure();
this.Region = new Region(this.gPath);
}
ShowInfoWindow函数用来将提示窗口显示出来，该函数需要将提示窗口附着的控件和需要显示的文本传递过来。然后，AnchorPointFromControl根据控件的位置返回提示窗口的箭头应该显示的坐标，代码如下：
public static Point AnchorPointFromControl(Control anchorControl)
{
if (anchorControl == null)
throw new ArgumentException();
Point controlLocation = anchorControl.Location;
System.Drawing.Size controlSize = anchorControl.Size;
if (anchorControl.Parent != null)
controlLocation = anchorControl.Parent.PointToScreen(controlLocation);
return controlLocation new Size(controlSize.Width / 2, controlSize.Height / 2);
}
PointToScreen表明将工作区点的位置映射成屏幕坐标统一进行计算。上述代码最后以行说明提示窗口的箭头显示在附着控件的中点。
将提示窗口的背景颜色设置成Info，外观如下图：
我们发现这样的外观有点别扭，没错！因为提示窗口缺少黑色边框！所以，还需要在窗体的OnPaint事件中添加代码，如下：
protected override void OnPaint(PaintEventArgs e)
{
Pen p = new Pen(Color.Black , 2);
e.Graphics.DrawPath(p, gPath);
base.OnPaint(e);
} 二、程序实现
启动Visual Studio 2005，新建Visual C#的Windows 应用程序项目，并取名为ShowInfoWindow，添加4个Button组件、1个Label组件、1个textBox组件和3个Panel组件，其中3个Button用来显示标注式消息提示窗口并分别附着在三个组件之上，代码如下：
……
private InfoWindow iw;
……
private void button1_Click(object sender, EventArgs e)
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