我刚学,本来认为CDC的都是用logic的坐标;
可以在VC技术内幕里有:
void CEx05cView::OnDraw(CDC* pDC)
{
CBrush brushHatch(HS_DIAGCROSS, RGB(255, 0, 0));
CPoint point(0, 0); // logical (0, 0) pDC->LPtoDP(&point); // In device coordinates,
怎么变为device coordinates后调用了SetBrushOrg啊?
pDC->SetBrushOrg(point); // align the brush with
// the window origin
pDC->SelectObject(&brushHatch);
pDC->Ellipse(CRect(m_pointTopLeft, m_sizeEllipse));
pDC->SelectStockObject(BLACK_BRUSH); // Deselect brushHatch
pDC->Rectangle(CRect(100, -100, 200, -200)); // Test invalid rect
}
可以在VC技术内幕里有:
void CEx05cView::OnDraw(CDC* pDC)
{
CBrush brushHatch(HS_DIAGCROSS, RGB(255, 0, 0));
CPoint point(0, 0); // logical (0, 0) pDC->LPtoDP(&point); // In device coordinates,
怎么变为device coordinates后调用了SetBrushOrg啊?
pDC->SetBrushOrg(point); // align the brush with
// the window origin
pDC->SelectObject(&brushHatch);
pDC->Ellipse(CRect(m_pointTopLeft, m_sizeEllipse));
pDC->SelectStockObject(BLACK_BRUSH); // Deselect brushHatch
pDC->Rectangle(CRect(100, -100, 200, -200)); // Test invalid rect
}
Parameters
x
Specifies the x-coordinate (in device units) of the new origin. This value must be in the range 0–7.y
Specifies the y-coordinate (in device units) of the new origin. This value must be in the range 0–7.point
Specifies the x- and y-coordinates of the new origin. Each value must be in the range 0–7. You can pass either a POINT structure or a CPoint object for this parameter.