/*
* Find where (x1, y1) -> (x2, y2) hits one of the lines in xvec, yvec.
* (*x3, *y3) is the point where it hits.
*
*/
void oglFindEndForPolyline(double n, double xvec[], double yvec[],
double x1, double y1, double x2, double y2, double *x3, double *y3)
{
int i;
double lastx = xvec[0];
double lasty = yvec[0];
double min_ratio = 1.0;
double line_ratio;
double other_ratio;
for (i = 1; i < n; i++)
{
oglCheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i],
&line_ratio, &other_ratio);
lastx = xvec[i];
lasty = yvec[i];
if (line_ratio < min_ratio)
min_ratio = line_ratio;
}
// Do last (implicit) line if last and first doubles are not identical
if (!(xvec[0] == lastx && yvec[0] == lasty))
{
oglCheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0],
&line_ratio, &other_ratio);
if (line_ratio < min_ratio)
min_ratio = line_ratio;
}
*x3 = (x1 + (x2 - x1)*min_ratio);
*y3 = (y1 + (y2 - y1)*min_ratio);
}
bool PolylineHitTest(double n, double xvec[], double yvec[],
double x1, double y1, double x2, double y2)
{
bool isAHit = FALSE;
int i;
double lastx = xvec[0];
double lasty = yvec[0];
double min_ratio = 1.0;
double line_ratio;
double other_ratio;
for (i = 1; i < n; i++)
{
oglCheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i],
&line_ratio, &other_ratio);
if (line_ratio != 1.0)
isAHit = TRUE;
lastx = xvec[i];
lasty = yvec[i];
if (line_ratio < min_ratio)
min_ratio = line_ratio;
}
// Do last (implicit) line if last and first doubles are not identical
if (!(xvec[0] == lastx && yvec[0] == lasty))
{
oglCheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0],
&line_ratio, &other_ratio);
if (line_ratio != 1.0)
isAHit = TRUE;
}
return isAHit;
}
void wxLineCrossings::FindCrossings(wxDiagram& diagram)
{
ClearCrossings();
wxNode* node1 = diagram.GetShapeList()->GetFirst();
while (node1)
{
wxShape* shape1 = (wxShape*) node1->GetData();
if (shape1->IsKindOf(CLASSINFO(wxLineShape)))
{
wxLineShape* lineShape1 = (wxLineShape*) shape1;
// Iterate through the segments
wxList* pts1 = lineShape1->GetLineControlPoints();
size_t i;
for (i = 0; i < (pts1->GetCount() - 1); i++)
{
wxRealPoint* pt1_a = (wxRealPoint*) (pts1->Item(i)->GetData());
wxRealPoint* pt1_b = (wxRealPoint*) (pts1->Item(i+1)->GetData());
// Now we iterate through the segments again
wxNode* node2 = diagram.GetShapeList()->GetFirst();
while (node2)
{
wxShape* shape2 = (wxShape*) node2->GetData();
// Assume that the same line doesn't cross itself
if (shape2->IsKindOf(CLASSINFO(wxLineShape)) && (shape1 != shape2))
{
wxLineShape* lineShape2 = (wxLineShape*) shape2;
// Iterate through the segments
wxList* pts2 = lineShape2->GetLineControlPoints();
int j;
for (j = 0; j < (int) (pts2->GetCount() - 1); j++)
{
wxRealPoint* pt2_a = (wxRealPoint*) (pts2->Item(j)->GetData());
wxRealPoint* pt2_b = (wxRealPoint*) (pts2->Item(j+1)->GetData());
// Now let's see if these two segments cross.
double ratio1, ratio2;
oglCheckLineIntersection(pt1_a->x, pt1_a->y, pt1_b->x, pt1_b->y,
pt2_a->x, pt2_a->y, pt2_b->x, pt2_b->y,
& ratio1, & ratio2);
if ((ratio1 < 1.0) && (ratio1 > -1.0))
{
// Intersection!
wxLineCrossing* crossing = new wxLineCrossing;
crossing->m_intersect.x = (pt1_a->x + (pt1_b->x - pt1_a->x)*ratio1);
crossing->m_intersect.y = (pt1_a->y + (pt1_b->y - pt1_a->y)*ratio1);
crossing->m_pt1 = * pt1_a;
crossing->m_pt2 = * pt1_b;
crossing->m_pt3 = * pt2_a;
crossing->m_pt4 = * pt2_b;
crossing->m_lineShape1 = lineShape1;
crossing->m_lineShape2 = lineShape2;
m_crossings.Append(crossing);
}
}
}
node2 = node2->GetNext();
}
}
}
node1 = node1->GetNext();
}
}