redraw

[lch2]

To understand the mfc dialog, onpaint better, after reading some online notes, made a little project. This draws a Horz. axis with a red color curve above it. What I can not figure how to do, is to redraw the whole thing multiple times with each time the whole plot moves. Like erase/redraw thing. don't know how to erase and redraw.

void MyDraw::OnPaint() 
{
 	CPaintDC dc(this);
 	DrawC(dc);
}

void MyDraw::DrawC(CDC& dc) 
{

	CRect rect;
	GetClientRect(rect);


	HDC hdc = dc.GetSafeHdc();
	CPen aPen, dkpen, redPen;
	aPen.CreatePen(PS_SOLID, 2, RGB(255, 225, 225));
	dkpen.CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
	redPen.CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
	CPen* pOldPen = dc.SelectObject(&aPen);

	CPen* gOldPen = dc.SelectObject(&dkpen); 
	dc.MoveTo(10,250);  
	dc.LineTo(220,250);
	dc.MoveTo(220,250);
	dc.LineTo(215,255);
	dc.MoveTo(220,250);
	dc.LineTo(215,245);  
	

	gOldPen = dc.SelectObject(&redPen); 
	dc.MoveTo(10,  250);
	dc.LineTo(100, 220);  
	dc.LineTo(150, 200);  
	dc.LineTo(190, 160); 
	dc.LineTo(195, 130);
}