C#

Event(object sender, EventArgs e);

<br />
TextBox box = sender as TextBox;<br />

Brad Wick wrote:

and I have seen posts where you can specify the Username in the URL

List<Primitive> primitivesDrawn = new List<Primitive>();

public abstract class Primitive
{
   public IEnumerable<Point> Points { get; set; }

   public abstract bool Intersects(Point pt);
   public abstract bool Intersects(Rect pt);
}

public class Line : Primitive;
public class Triangle : Primitive;
public class Rectangle : Primitive;

void ClickedEdge(Point mousePoint)
{
  if(mousePoint.Y == ( lineM*mousePoint.X +lineC))
    //the user clicked the line!
}

float Y = lineM*mousePoint.X +lineC;
Y = Y - mousePoint.Y;
Y *= Y;
if(Y <= 1)
  //user (mostly) clicked the line!

m = (endY - startY)/(endX - startX);<br />
c = m*startX - startY;

int lineM = (edge.EndPoint.Y - edge.StartPoint.Y) / (edge.EndPoint.X - edge.StartPoint.Y);
int lineC = lineM * edge.StartPoint.X - edge.StartPoint.Y;
int lineX = 0;

if (mousePoint.Y == (lineM * lineX + lineC))
    Trace.WriteLine("hit");

PointF start = new Point(0, 0);
PointF end = new Point(150, 150);
float m;
float c;

protected override void OnPaint(PaintEventArgs e)
{
	base.OnPaint(e);
	e.Graphics.DrawLine(Pens.Black, start, end);
}

void Form1MouseClick(object sender, MouseEventArgs e)
{
	m = (end.Y - start.Y)/(end.X - start.X);
	c = start.Y - m*start.X;
	
	Y = m*e.X + c;
	Y -= e.Y;
	Y *= Y;
	if(Y <= 5)
		MessageBox.Show("Shwam");			
}

m = (end.Y - start.Y)/(end.X - start.X);
c = start.Y - m*start.X;
	
Y = m*e.X + c;
Y -= e.Y;
if(-3 < Y && Y lt; 2)
	MessageBox.Show("Shwam");

if(float.IsInfinity(m)) {
	float X = start.X - e.X;
	if(-3 < X && X < 3)
		MessageBox.Show("Shwam");
}