void xCanvas::ProcessMsg(UINT msg, int x, int y)
{
if (msg == WM_XINK_STARTSTROKE)
StartStroke();
if (msg == WM_XINK_ADDPOINT)
AddPoint(x, y);
if (msg == WM_XINK_STOPSTROKE)
StopStroke();
}
//----------------------------------------------------------------------------
void DragDropLink::AutoStroke(){
//----------------------------------------------------------------------------
PROC_TRACE;
assert(m_pFrom != NULL);
assert(m_pTo != NULL);
CPoint fromPt, toPt;
int fromDir, toDir;
// fromPt is an x,y to start from. fromDir is an angle that the first link must
// obey (0,90,180,270 for now)
//
// 0 - right
// 90 - up
// 180 - left
// 270 - down
fromPt = m_pFrom->GetFromLinkPoint();
fromDir = m_pFrom->GetFromLinkDir();
toPt = m_pTo->GetToLinkPoint();
toDir = m_pTo->GetToLinkDir();
// draw a line between the two points.
StartStroke();
AddPoint(fromPt);
// MIN_LINK_SEGMENT = minimum length of Initial/final link segment
// MAX_LINK_SEGMENT = maximum length of Initial/final link segment
// CALC_LINK_SEGMENT = divisor to calculate Initial/final link segment
// Minimize "Z-shaped" links by adjusting the Initial & final link
// segments when the x and y deltas are small.
int xseg = abs(fromPt.x - toPt.x) / CALC_LINK_SEGMENT;
int yseg = abs(fromPt.y - toPt.y) / CALC_LINK_SEGMENT;
if (xseg > MAX_LINK_SEGMENT)
xseg = MAX_LINK_SEGMENT;
else if (xseg < MIN_LINK_SEGMENT)
xseg = MIN_LINK_SEGMENT;
if (yseg > MAX_LINK_SEGMENT)
yseg = MAX_LINK_SEGMENT;
else if (yseg < MIN_LINK_SEGMENT)
yseg = MIN_LINK_SEGMENT;
// now, we have the minimum X offsets for the normal case. It is
// time to see if the port would like to increase that minimum offset
int fromMinXOffset = m_pFrom->GetMinXOffset();
int xsegFrom = (xseg > fromMinXOffset) ? xseg : fromMinXOffset;
int toMinXOffset = m_pTo->GetMinXOffset();
int xsegTo = (xseg > toMinXOffset) ? xseg : toMinXOffset;
// draw the Initial offset in Initial direction
int cx = 0;
int cy = 0;
if (fromDir == 0) cx = xsegFrom;
if (fromDir == 90) cy = yseg;
if (fromDir == 180) cx = - xsegFrom;
if (fromDir == 270) cy = - yseg;
fromPt += CSize(cx, cy);
AddPoint(fromPt);
// calculate the offset from the "to" point
fromPt = toPt; // copy to point
cx = cy = 0;
if (toDir == 0) cx = xsegTo;
if (toDir == 90) cy = yseg;
if (toDir == 180) cx = - xsegTo;
if (toDir == 270) cy = - yseg;
fromPt += CSize(cx, cy);
AddPoint(fromPt);
// now finish up
AddPoint(toPt);
FinishStroke();
}
