// Assume (x1, y1) is centre of box (most generally, line end at box)
bool wxPolygonShape::GetPerimeterPoint(double x1, double y1,
double x2, double y2,
double *x3, double *y3)
{
int n = m_points->GetCount();
// First check for situation where the line is vertical,
// and we would want to connect to a point on that vertical --
// oglFindEndForPolyline can't cope with this (the arrow
// gets drawn to the wrong place).
if ((m_attachmentMode == ATTACHMENT_MODE_NONE) && (x1 == x2))
{
// Look for the point we'd be connecting to. This is
// a heuristic...
wxNode *node = m_points->GetFirst();
while (node)
{
wxRealPoint *point = (wxRealPoint *)node->GetData();
if (point->x == 0.0)
{
if ((y2 > y1) && (point->y > 0.0))
{
*x3 = point->x + m_xpos;
*y3 = point->y + m_ypos;
return TRUE;
}
else if ((y2 < y1) && (point->y < 0.0))
{
*x3 = point->x + m_xpos;
*y3 = point->y + m_ypos;
return TRUE;
}
}
node = node->GetNext();
}
}
double *xpoints = new double[n];
double *ypoints = new double[n];
wxNode *node = m_points->GetFirst();
int i = 0;
while (node)
{
wxRealPoint *point = (wxRealPoint *)node->GetData();
xpoints[i] = point->x + m_xpos;
ypoints[i] = point->y + m_ypos;
node = node->GetNext();
i ++;
}
oglFindEndForPolyline(n, xpoints, ypoints,
x1, y1, x2, y2, x3, y3);
delete[] xpoints;
delete[] ypoints;
return TRUE;
}
void oglFindEndForBox(double width, double height,
double x1, double y1, // Centre of box (possibly)
double x2, double y2, // other end of line
double *x3, double *y3) // End on box edge
{
double xvec[5];
double yvec[5];
xvec[0] = (double)(x1 - width/2.0);
yvec[0] = (double)(y1 - height/2.0);
xvec[1] = (double)(x1 - width/2.0);
yvec[1] = (double)(y1 + height/2.0);
xvec[2] = (double)(x1 + width/2.0);
yvec[2] = (double)(y1 + height/2.0);
xvec[3] = (double)(x1 + width/2.0);
yvec[3] = (double)(y1 - height/2.0);
xvec[4] = (double)(x1 - width/2.0);
yvec[4] = (double)(y1 - height/2.0);
oglFindEndForPolyline(5, xvec, yvec, x2, y2, x1, y1, x3, y3);
}
