Geom::Path half_outline_old(Geom::Path const& input, double width, double miter, Inkscape::LineJoinType join = Inkscape::JOIN_BEVEL)
{
Geom::Path res;
if (input.size() == 0) return res;
Geom::Point tang1 = input[0].unitTangentAt(0);
Geom::Point start = input.initialPoint() + tang1 * width;
Geom::Path temp;
Geom::Point tang[2];
res.setStitching(true);
temp.setStitching(true);
res.start(start);
// Do two curves at a time for efficiency, since the join function needs to know the outgoing curve as well
const size_t k = (input.back_closed().isDegenerate() && input.closed())
?input.size_default()-1:input.size_default();
for (size_t u = 0; u < k; u += 2) {
temp.clear();
offset_curve_old(temp, &input[u], width);
// on the first run through, there isn't a join
if (u == 0) {
res.append(temp);
} else {
tangents_old(tang, input[u-1], input[u]);
outline_join(res, temp, tang[0], tang[1], width, miter, join);
}
// odd number of paths
if (u < k - 1) {
temp.clear();
offset_curve_old(temp, &input[u+1], width);
tangents_old(tang, input[u], input[u+1]);
outline_join(res, temp, tang[0], tang[1], width, miter, join);
}
}
if (input.closed()) {
Geom::Curve const &c1 = res.back();
Geom::Curve const &c2 = res.front();
temp.clear();
temp.append(c1);
Geom::Path temp2;
temp2.append(c2);
tangents_old(tang, input.back(), input.front());
outline_join(temp, temp2, tang[0], tang[1], width, miter, join);
res.erase(res.begin());
res.erase_last();
//
res.append(temp);
res.close();
}
return res;
}
/* rectangular cutter.
ctr "center" of rectangle (might not actually be in the center with respect to leading/trailing edges
pos vector from center to leading edge
neg vector from center to trailing edge
width vector to side edge
*/
Geom::PathVector PrintMetafile::rect_cutter(Geom::Point ctr, Geom::Point pos, Geom::Point neg, Geom::Point width)
{
std::vector<Geom::Path> outres;
Geom::Path cutter;
cutter.start(ctr + pos - width);
cutter.appendNew<Geom::LineSegment>(ctr + pos + width);
cutter.appendNew<Geom::LineSegment>(ctr + neg + width);
cutter.appendNew<Geom::LineSegment>(ctr + neg - width);
cutter.close();
outres.push_back(cutter);
return outres;
}
void Inkscape::ObjectSnapper::_snapPathsConstrained(IntermSnapResults &isr,
SnapCandidatePoint const &p,
SnapConstraint const &c,
Geom::Point const &p_proj_on_constraint) const
{
_collectPaths(p_proj_on_constraint, p.getSourceType(), p.getSourceNum() <= 0);
// Now we can finally do the real snapping, using the paths collected above
SPDesktop const *dt = _snapmanager->getDesktop();
g_assert(dt != NULL);
Geom::Point direction_vector = c.getDirection();
if (!is_zero(direction_vector)) {
direction_vector = Geom::unit_vector(direction_vector);
}
// The intersection point of the constraint line with any path, must lie within two points on the
// SnapConstraint: p_min_on_cl and p_max_on_cl. The distance between those points is twice the snapping tolerance
Geom::Point const p_min_on_cl = dt->dt2doc(p_proj_on_constraint - getSnapperTolerance() * direction_vector);
Geom::Point const p_max_on_cl = dt->dt2doc(p_proj_on_constraint + getSnapperTolerance() * direction_vector);
Geom::Coord tolerance = getSnapperTolerance();
// PS: Because the paths we're about to snap to are all expressed relative to document coordinate system, we will have
// to convert the snapper coordinates from the desktop coordinates to document coordinates
std::vector<Geom::Path> constraint_path;
if (c.isCircular()) {
Geom::Circle constraint_circle(dt->dt2doc(c.getPoint()), c.getRadius());
constraint_circle.getPath(constraint_path);
} else {
Geom::Path constraint_line;
constraint_line.start(p_min_on_cl);
constraint_line.appendNew<Geom::LineSegment>(p_max_on_cl);
constraint_path.push_back(constraint_line);
}
// Length of constraint_path will always be one
bool strict_snapping = _snapmanager->snapprefs.getStrictSnapping();
// Find all intersections of the constrained path with the snap target candidates
std::vector<Geom::Point> intersections;
for (std::vector<SnapCandidatePath >::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); ++k) {
if (k->path_vector && _allowSourceToSnapToTarget(p.getSourceType(), (*k).target_type, strict_snapping)) {
// Do the intersection math
Geom::CrossingSet cs = Geom::crossings(constraint_path, *(k->path_vector));
// Store the results as intersection points
unsigned int index = 0;
for (Geom::CrossingSet::const_iterator i = cs.begin(); i != cs.end(); ++i) {
if (index >= constraint_path.size()) {
break;
}
// Reconstruct and store the points of intersection
for (Geom::Crossings::const_iterator m = (*i).begin(); m != (*i).end(); ++m) {
intersections.push_back(constraint_path[index].pointAt((*m).ta));
}
index++;
}
//Geom::crossings will not consider the closing segment apparently, so we'll handle that separately here
//TODO: This should have been fixed in rev. #9859, which makes this workaround obsolete
for(Geom::PathVector::iterator it_pv = k->path_vector->begin(); it_pv != k->path_vector->end(); ++it_pv) {
if (it_pv->closed()) {
// Get the closing linesegment and convert it to a path
Geom::Path cls;
cls.close(false);
cls.append(it_pv->back_closed());
// Intersect that closing path with the constrained path
Geom::Crossings cs = Geom::crossings(constraint_path.front(), cls);
// Reconstruct and store the points of intersection
index = 0; // assuming the constraint path vector has only one path
for (Geom::Crossings::const_iterator m = cs.begin(); m != cs.end(); ++m) {
intersections.push_back(constraint_path[index].pointAt((*m).ta));
}
}
}
// Convert the collected points of intersection to snapped points
for (std::vector<Geom::Point>::iterator p_inters = intersections.begin(); p_inters != intersections.end(); ++p_inters) {
// Convert to desktop coordinates
(*p_inters) = dt->doc2dt(*p_inters);
// Construct a snapped point
Geom::Coord dist = Geom::L2(p.getPoint() - *p_inters);
SnappedPoint s = SnappedPoint(*p_inters, p.getSourceType(), p.getSourceNum(), k->target_type, dist, getSnapperTolerance(), getSnapperAlwaysSnap(), true, k->target_bbox);;
// Store the snapped point
if (dist <= tolerance) { // If the intersection is within snapping range, then we might snap to it
isr.points.push_back(s);
}
}
}
}
}