GDI+如何判断一个点是否在区域内

Point point(60, 10);
// Assume that the variable "point" contains the location
// of the most recent click.
// To simulate a hit, assign (60, 10) to point.
// To simulate a miss, assign (0, 0) to point.
SolidBrush solidBrush(Color());
Region region1(Rect(50, 0, 50, 150));
Region region2(Rect(0, 50, 150, 50));
// Create a plus-shaped region by forming the union of region1 and region2.
// The union replaces region1.
region1.Union(®ion2);
if(region1.IsVisible(point, &graphics))
{
// The point is in the region. Use an opaque brush.
solidBrush.SetColor(Color(255, 255, 0, 0));
}
else
{
// The point is not in the region. Use a semitransparent brush.
solidBrush.SetColor(Color(64, 255, 0, 0));
}
graphics.FillRegion(&solidBrush, ®ion1);

LRESULT CMovableWinView::OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{

curPos.X = GET_X_LPARAM(lParam);
curPos.Y = GET_Y_LPARAM(lParam);
if (wParam & MK_LBUTTON)
{
;
}
Gdiplus::Graphics g(m_hWnd);
Gdiplus::Point point(curPos.X, curPos.Y);

Gdiplus::Rect rect(100, 100, 300, 300);
Gdiplus::Pen pen(penColor);
g.DrawRectangle(&pen, rect);

Gdiplus::Region region(rect);

Gdiplus::SolidBrush solidBrush(Gdiplus::Color(255, 255, 255, 255));
if (region.IsVisible(point, &g))
{
solidBrush.SetColor(Gdiplus::Color(255, 255, 0, 0));

}
else
{
solidBrush.SetColor(Gdiplus::Color(255, 255, 255, 255));
}

rect.X += 1;
rect.Y += 1;
rect.Width -= 1;
rect.Height -= 1;
g.FillRectangle(&solidBrush, rect);
return TRUE;
}