public void ToolMouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
lineSegment = new LineSegment(new System.Drawing.Point(e.X, e.Y));
lineSegment.Endpoint = new System.Drawing.Point(e.X, e.Y);
canvas.AddDrawingObject(lineSegment);
selectedRectangle = this.canvas.GetRectangleObjectAt(e.X, e.Y);
lineSegment.xstart = e.X;
lineSegment.ystart = e.Y;
if (selectedRectangle != null)
{
//implemented later
}
}
}