graphics path arc validation

[alarock]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Collections;

namespace Wire_Poc1
{
public partial class Form1 : Form
{
ArrayList GrfxPthList = new ArrayList();
public Form1()
{
InitializeComponent();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
}

GraphicsPath myPath;
protected override void OnMouseClick(MouseEventArgs e)
{
Graphics grfxClick = this.CreateGraphics();
myPath = new GraphicsPath();
myPath.AddArc(e.X, e.Y, 20, 20, 0, 180);
grfxClick.DrawPath(new Pen(Color.Red), myPath);
GrfxPthList.Add(myPath);
base.OnMouseClick(e);
}
}
}



I am using GraphicsPath to drawing an object (Arc), But i want to make a validation

1) I should protect the Drawing of an object(Arc) above an Arc.// Arc should not intersect with an Arc.

so i used isVisible .But it does not works , Since path.isVisible takes a rectangle.I also used Region concept.But i cant able to acheive??


Please Give me soultion