Winforms circle always out of form border of form

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C#

GDI

GDI+

WinForms

graphics

I trying to draw a circle with mouse up, move, and down events. I have a circle class. Everything is going fine until I try to draw a circle and it is going out of bounds of my form. Everything is fine when my circle in the left and the upper broader(x=0, y=somepoint) and the upperborder(x=somepoint, y=0). The problem is with the border(width) and with the bottom border(height). I think something is wrong with my calculation.

Can anyone help? Here the mousemove event:

int x = x_pos_checker(e.X);
int y = y_pos_checker(e.Y);
//switch places
m_current_shape.Xpos = (x < m_startpoint.X) ? x : m_startpoint.X;
m_current_shape.Ypos = (y < m_startpoint.Y) ? y : m_startpoint.Y;
double deltax = Math.Pow(x - m_startpoint.X, 2);
double deltay = Math.Pow(y - m_startpoint.Y, 2);
((Circle) m_current_shape).Diam = (float) Math.Sqrt(deltax + deltay);
Invalidate(); //re-paint

Here is the x and y checkers:

private int x_pos_checker(int i_mousex) {
    if (i_mousex < 0) {
        return 0;
    } else if (i_mousex > ClientRectangle.Width) {
        return ClientRectangle.Width;
    } else {
        return i_mousex;
    }
}
private int y_pos_checker(int i_mousey) {
    if (i_mousey < groupBox1.Height) {
        return groupBox1.Height;
    }
    if (i_mousey > ClientRectangle.Height) {
        return ClientRectangle.Height;
    } else {
        return i_mousey;
    }

And the drawmethod in class Circle:

public override void draw(PaintEventArgs e) {
    Graphics Cirlcegraphic = e.Graphics;
    m_currentrectangle = new RectangleF(Xpos, Ypos, (float) m_diam, (float) m_diam); //for hittest
    Cirlcegraphic.FillEllipse(Brushes.White, m_currentrectangle);
}