Visual C++ and MFC Programming 2nd Edition

Chapter 7: GDI Accessories and Tools Visual C++ and MFC Fundamentals

dc.LineTo(PtLine[5]);
dc.LineTo(PtLine[6]);
dc.LineTo(PtLine[7]);
dc.LineTo(PtLine[8]);

dc.Polygon(Bedroom1, 4);
dc.Polygon(Closets, 4);
dc.Polygon(Bedroom2, 4);
// Do not call CView::OnPaint() for painting messages
}

Test the application and return to MSVC

6.3.5 Multiple Polygons................................................................................

If you want to draw multiple polygons, you can use the CDC::PolyPolygon() method

whose syntax is:

BOOL PolyPolygon(LPPOINT lpPoints, LPINT lpPolyCounts, int nCount);

Like the Polygon() method, the lpPoints argument is an array of POINT or CPoint values.

The PolyPolygon() method needs to know the number of polygons you would be

drawing. Each polygon uses the points of the lpPoints values but when creating the array

of points, the values must be incremental. This means that PolyPolygon() will not

randomly access the values of lpPoints. Each polygon has its own set of points.

Unlike Polygon(), the nCount argument of PolyPolygon() is the number of polygons you

want to draw and not the number of points.

The lpPolyCounts argument is an array or integers. Each member of this array specifies

the number of vertices (lines) that its polygon will have..

Here is an example:

void CExoView::OnDraw(CDC* pDC)

{

CPoint Pt[12];

int lpPts[] = { 3, 3, 3, 3 };

// Top Triangle

Pt[0] = CPoint(125, 10);

Pt[1] = CPoint( 95, 70);

Pt[2] = CPoint(155, 70);

// Left Triangle

Pt[3] = CPoint( 80, 80);

Pt[4] = CPoint( 20, 110);

Pt[5] = CPoint( 80, 140);

// Bottom Triangle

Pt[6] = CPoint( 95, 155);

Pt[7] = CPoint(125, 215);

Pt[8] = CPoint(155, 155);

// Right Triangle

Pt[9] = CPoint(170, 80);