Coordinate problem (an image attached)

[Emerald214]

I want to reuse DrawPie function to draw 4 same pies, but it was unexpected. I don't understand what have been happening.
I divide the client area by 4, then pass each rect to DrawPie.

application image: http://i240.photobucket.com/albums/f...214/post-1.jpg

void CMainWindow::DrawPie(CDC *pDC, CRect &rect)
{
	// prepare to draw pie
	CBrush brush;
	brush.CreateHatchBrush(HS_BDIAGONAL, RGB(255, 0, 0));
	CBrush *pOldBrush = pDC->SelectObject(&brush);

	CPoint startPoint = rect.BottomRight();
	CPoint endPoint = rect.BottomRight();
	startPoint.y /= 2;
	endPoint.x /= 2;

	// draw pie
	pDC->Pie(&rect, startPoint, endPoint);

	pDC->SelectObject(pOldBrush);
}

void CMainWindow::OnPaint()
{
	CPaintDC dc(this);
	CRect rect;
	GetClientRect(&rect);	
	
	
	int leftCenter = rect.left / 2;
	int topCenter = rect.top / 2;
	int rightCenter = rect.right / 2;
	int bottomCenter = rect.bottom / 2;

	COLORREF clrColors[] = {RGB(100, 0, 0), RGB(0, 100, 0), RGB(0, 0, 100), RGB(100, 0, 100)};
	int widthIncrement = rect.right / 2;
	int heightIncrement = rect.bottom / 2;
	int k = 0;
	for(int i = 0; i < rect.bottom; i += heightIncrement)
		for(int j = 0; j < rect.right; j += widthIncrement)
		{
			CPoint leftTop(j, i);
			CPoint rightBottom(j + widthIncrement, i + heightIncrement);

			CRect rect;
			rect.TopLeft() = leftTop;
			rect.BottomRight() = rightBottom;

			CBrush brush;
			brush.CreateSolidBrush(clrColors[k++]);
			CBrush *pOldBrush = dc.SelectObject(&brush);
			dc.Rectangle(rect);

			DrawPie(&dc, rect);
			dc.SelectObject(pOldBrush);
		}	
}

Thank you

[D_Drmmr]

[code]
CPoint startPoint = rect.BottomRight();
CPoint endPoint = rect.BottomRight();
startPoint.y /= 2;
endPoint.x /= 2;

Check which points are calculated here for each of the four pies you draw. Then check what those points should be.

BTW, why did you post this in the non visual C++ forum?

[Emerald214]

I'm sorry. I did wrong-post.