//the class PaintEventArgs provides data for the object event Paint
private void panelDrawing_Paint(object sender, PaintEventArgs e)
{
// Fill before painting to have a lighter border
// Rectangle
if (this.radioButtonRectangle.Checked == true && myRectangle != null)
{
if (fill)
{
myRectangle.Fill(e);
}
myRectangle.Draw(e);
this.textBoxDisplay.Text = myRectangle.ToString();
}
// Square
if (this.radioButtonSquare.Checked == true && mySquare != null)
{
if (fill)
{
mySquare.Fill(e);
}
mySquare.Draw(e);
this.textBoxDisplay.Text = mySquare.ToString();
}
// Circle
if (this.radioButtonCircle.Checked == true && myCircle != null)
{
if (fill)
{
myCircle.Fill(e);
}
myCircle.Draw(e);
this.textBoxDisplay.Text = myCircle.ToString();
}
// Ellipse
if (this.radioButtonEllipse.Checked == true && myEllipse != null)
{
if (fill)
{
myEllipse.Fill(e);
}
myEllipse.Draw(e);
this.textBoxDisplay.Text = myEllipse.ToString();
}
}