This is what I have for when the sin button is pressed. am I getting close?

pDC->MoveTo(60, 150);
pDC->LineTo(60, 300);
pDC->LineTo(575, 300);
pDC->MoveTo(60, 300);
pDC->LineTo(60, 450);

for(i = 0; i < count; i++);
switch (m_Chart) {

case Sin:

double iSamplesvalue = 300 -(m_iSamples * 150);


pDC->MoveTo (300, m_iSamples);
pDC->LineTo (60, m_iSamples);
break;
}
}