is this code mfc or api or openGL etc.?

[bos1234]

I've never come across this type of source code before? What is it called and are there tutorials explaining what the functions mean?

CB3::~CB3()
{

}

void CB3::Draw(CDC *pDC)
{
	/*******************************/
	// Place your drawing code here. 
	// Examples are given below.
	/*******************************/



	// Select a solid black (black = RGB(0,0,0)) pen with a width of 1 pixel.
	int penWidth = 1;
	CPen pen(PS_SOLID,penWidth,RGB(0,0,0));


	// Store the previous pen and set the current pen for drawing on the screen.
	CPen *ppen=pDC->SelectObject(&pen);


	// Select a solid blue (blue = RGB(0,0,255)) brush to fill an enclosed area.
	CBrush brush(RGB(0,0,255));

	// You can select other fill patterns, such as HS_BDIAGONAL, 
	// HS_CROSS, HS_DIAGCROSS, HS_FDIAGONAL, HS_HORIZONTAL, HS_VERTICAL.
	// The following line selects a HS_CROSS brush
	// CBrush brush(HS_CROSS, RGB(0,0,255));


	// Store the previous brush and set the current brush for painting.
	CBrush *pbrush=pDC->SelectObject(&brush);


	// Draw a rectangle 
	pDC->Rectangle(70,20,120,120);


	// Draw a round rectangle 
	pDC->RoundRect(150,20,200,120,10,15);


	// Draw an ellipse
	pDC->Ellipse(220,20, 280,120);

	// Draw a polygon with 5 vertices.
	CPoint *vertices = new CPoint[5];
	vertices[0].x = 300; vertices[0].y = 50; 
	vertices[1].x = 330; vertices[1].y = 20; 
	vertices[2].x = 370; vertices[2].y = 40;
	vertices[3].x = 440; vertices[3].y = 30;
	vertices[4].x = 380; vertices[4].y = 120; 
	pDC->Polygon(vertices,5);


	delete vertices;

	// Recover the previous pen and delete the current pen.
	pDC->SelectObject(ppen);
	pen.DeleteObject();

	
	// Recover the previous brush and delete the current brush.
	pDC->SelectObject(pbrush);
	brush.DeleteObject();
}