void CXTPFlowGraphPaintManager::DrawConnection(CXTPFlowGraphDrawContext* pDC, CXTPFlowGraphConnection* pConnection)
{
CRect rcConnectionBounds = pConnection->GetBoundingRect();
CRect rcBounds = pDC->GetClipRect();
CXTPFlowGraphControl* pControl = pConnection->GetControl();
if (rcBounds.right < rcConnectionBounds.left || rcBounds.left > rcConnectionBounds.right ||
rcBounds.top > rcConnectionBounds.bottom || rcBounds.bottom < rcConnectionBounds.top)
return;
if (pControl->GetZoomLevel() < m_dMinZoomLevelConnections)
return;
COLORREF clrConnection = pConnection->GetColor() != (COLORREF)-1 ? pConnection->GetColor() : m_clrConnection;
if (pConnection->IsSelected())
clrConnection = m_clrSelection;
pDC->SetPen(clrConnection, 2);
pDC->DrawCurve(pConnection->m_pPath);
if (pConnection->IsSelected() && pConnection->GetControlPoint() != CPoint(-1, -1))
{
pDC->SetPen(0, 0);
pDC->SetBrush(clrConnection);
CPoint pt(pConnection->GetControlPoint());
pDC->Ellipse(CRect(pt.x - 3, pt.y - 3, pt.x + 3, pt.y + 3));
}
if (m_bDrawArrow)
{
Gdiplus::GraphicsPath* path = pConnection->m_pPath->Clone();
path->Flatten();
const REAL rArrow = 10.0;
PointF ptEnd = XTPGetPosition(path, REAL(-m_nEllipseSize / 2));
PointF ptFrom = XTPGetPosition(path, REAL(- (m_nEllipseSize / 2 + rArrow)));
Point ptArrow[3];
PointF ptDiff = ptFrom - ptEnd;
ptArrow[0] = Point((int)ptEnd.X, (int)ptEnd.Y);
ptArrow[1] = Point(int(ptFrom.X - ptDiff.Y * (4.0) / rArrow), int(ptFrom.Y + ptDiff.X * (4.0) / rArrow));
ptArrow[2] = Point(int(ptFrom.X + ptDiff.Y * (4.0) / rArrow), int(ptFrom.Y - ptDiff.X * (4.0) / rArrow));
pDC->SetBrush(clrConnection);
pDC->FillPolygon((POINT*)ptArrow, 3);
delete path;
}
}
