![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/snapped-line.cpp b/src/snapped-line.cpp
index 663da2e8af6745320d78213871dfdcd7ad745edc..090eadf0a26abea58a13614fbd57b5ac97e9303a 100644 (file)
--- a/src/snapped-line.cpp
+++ b/src/snapped-line.cpp
*/
#include "snapped-line.h"
-#include "geom.h"
-#include "libnr/nr-values.h"
+#include <2geom/line.h>
-Inkscape::SnappedLineSegment::SnappedLineSegment(NR::Point snapped_point, NR::Coord snapped_distance, NR::Point start_point_of_line, NR::Point end_point_of_line)
- : _start_point_of_line(start_point_of_line), _end_point_of_line(end_point_of_line)
+Inkscape::SnappedLineSegment::SnappedLineSegment(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, SnapTargetType const &target, Geom::Coord const &snapped_tolerance, bool const &always_snap, Geom::Point const &start_point_of_line, Geom::Point const &end_point_of_line)
+ : _start_point_of_line(start_point_of_line), _end_point_of_line(end_point_of_line)
{
- _distance = snapped_distance;
- _point = snapped_point;
- _at_intersection = false;
+ _point = snapped_point;
+ _source = source;
+ _source_num = source_num;
+ _target = target;
+ _distance = snapped_distance;
+ _tolerance = std::max(snapped_tolerance, 1.0);
+ _always_snap = always_snap;
+ _at_intersection = false;
+ _second_distance = NR_HUGE;
+ _second_tolerance = 1;
+ _second_always_snap = false;
}
-Inkscape::SnappedLineSegment::SnappedLineSegment()
+Inkscape::SnappedLineSegment::SnappedLineSegment()
{
- _start_point_of_line = NR::Point(0,0);
- _end_point_of_line = NR::Point(0,0);
- _distance = NR_HUGE;
- _point = NR::Point(0,0);
- _at_intersection = false;
+ _start_point_of_line = Geom::Point(0,0);
+ _end_point_of_line = Geom::Point(0,0);
+ _point = Geom::Point(0,0);
+ _source = SNAPSOURCE_UNDEFINED;
+ _source_num = -1;
+ _target = SNAPTARGET_UNDEFINED;
+ _distance = NR_HUGE;
+ _tolerance = 1;
+ _always_snap = false;
+ _at_intersection = false;
+ _second_distance = NR_HUGE;
+ _second_tolerance = 1;
+ _second_always_snap = false;
}
{
}
-Inkscape::SnappedPoint Inkscape::SnappedLineSegment::intersect(SnappedLineSegment const &line) const
+Inkscape::SnappedPoint Inkscape::SnappedLineSegment::intersect(SnappedLineSegment const &line) const
{
- //TODO: Diederik, implement the intersection
- NR::Point const intersection = NR::Point(NR_HUGE, NR_HUGE);
-
- //if (result == INTERSECTS) {
- /* The relevant snapped distance is the distance to the closest snapped line, not the
- distance to the intersection. For example, when a box is almost aligned with a grid
- in both horizontal and vertical directions, the distance to the intersection of the
- grid lines will always be larger then the distance to a grid line. We will be snapping
- to the closest snapped point however, so if we ever want to snap to the intersection
- then the distance to it should at least be equal to the other distance, not greater
- than it, as that would rule the intersection out
- */
- NR::Coord distance = std::min(_distance, line.getDistance());
- //}
- return SnappedPoint(intersection, distance);
+ Geom::OptCrossing inters = Geom::OptCrossing(); // empty by default
+ try
+ {
+ inters = Geom::intersection(getLineSegment(), line.getLineSegment());
+ }
+ catch (Geom::InfiniteSolutions e)
+ {
+ // We're probably dealing with parallel lines, so they don't really cross
+ inters = Geom::OptCrossing();
+ }
+
+ if (inters) {
+ Geom::Point inters_pt = getLineSegment().pointAt((*inters).ta);
+ /* If a snapper has been told to "always snap", then this one should be preferred
+ * over the other, if that other one has not been told so. (The preferred snapper
+ * will be labeled "primary" below)
+ */
+ bool const c1 = this->getAlwaysSnap() && !line.getAlwaysSnap(); //do not use _tolerance directly!
+ /* If neither or both have been told to "always snap", then cast a vote based on
+ * the snapped distance. For this we should consider the distance to the snapped
+ * line, not the distance to the intersection.
+ * See the comment in Inkscape::SnappedLine::intersect
+ */
+ bool const c2 = _distance < line.getSnapDistance();
+ bool const use_this_as_primary = c1 || c2;
+ Inkscape::SnappedLineSegment const *primarySLS = use_this_as_primary ? this : &line;
+ Inkscape::SnappedLineSegment const *secondarySLS = use_this_as_primary ? &line : this;
+ Geom::Coord primaryDist = use_this_as_primary ? Geom::L2(inters_pt - this->getPoint()) : Geom::L2(inters_pt - line.getPoint());
+ Geom::Coord secondaryDist = use_this_as_primary ? Geom::L2(inters_pt - line.getPoint()) : Geom::L2(inters_pt - this->getPoint());
+ return SnappedPoint(inters_pt, SNAPSOURCE_UNDEFINED, primarySLS->getSourceNum(), SNAPTARGET_PATH_INTERSECTION, primaryDist, primarySLS->getTolerance(), primarySLS->getAlwaysSnap(), true, false, true,
+ secondaryDist, secondarySLS->getTolerance(), secondarySLS->getAlwaysSnap());
+ }
+
+ // No intersection
+ return SnappedPoint(Geom::Point(NR_HUGE, NR_HUGE), SNAPSOURCE_UNDEFINED, 0, SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false, false, false, NR_HUGE, 0, false);
};
-Inkscape::SnappedLine::SnappedLine(NR::Point snapped_point, NR::Coord snapped_distance, NR::Point normal_to_line, NR::Point point_on_line)
+Inkscape::SnappedLine::SnappedLine(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, SnapTargetType const &target, Geom::Coord const &snapped_tolerance, bool const &always_snap, Geom::Point const &normal_to_line, Geom::Point const &point_on_line)
: _normal_to_line(normal_to_line), _point_on_line(point_on_line)
{
- _distance = snapped_distance;
- _point = snapped_point;
- _at_intersection = false;
+ _source = source;
+ _source_num = source_num;
+ _target = target;
+ _distance = snapped_distance;
+ _tolerance = std::max(snapped_tolerance, 1.0);
+ _always_snap = always_snap;
+ _second_distance = NR_HUGE;
+ _second_tolerance = 1;
+ _second_always_snap = false;
+ _point = snapped_point;
+ _at_intersection = false;
}
-Inkscape::SnappedLine::SnappedLine()
+Inkscape::SnappedLine::SnappedLine()
{
- _normal_to_line = NR::Point(0,0);
- _point_on_line = NR::Point(0,0);
- _distance = NR_HUGE;
- _point = NR::Point(0,0);
- _at_intersection = false;
+ _normal_to_line = Geom::Point(0,0);
+ _point_on_line = Geom::Point(0,0);
+ _source = SNAPSOURCE_UNDEFINED;
+ _source_num = -1;
+ _target = SNAPTARGET_UNDEFINED;
+ _distance = NR_HUGE;
+ _tolerance = 1;
+ _always_snap = false;
+ _second_distance = NR_HUGE;
+ _second_tolerance = 1;
+ _second_always_snap = false;
+ _point = Geom::Point(0,0);
+ _at_intersection = false;
}
Inkscape::SnappedLine::~SnappedLine()
{
}
-Inkscape::SnappedPoint Inkscape::SnappedLine::intersect(SnappedLine const &line) const
+Inkscape::SnappedPoint Inkscape::SnappedLine::intersect(SnappedLine const &line) const
{
- // Calculate the intersection of to lines, which are both within snapping range
- // The point of intersection should be considered for snapping, but might be outside the snapping range
-
- NR::Point intersection = NR::Point(NR_HUGE, NR_HUGE);
- NR::Coord distance = NR_HUGE;
-
- IntersectorKind result = intersector_line_intersection(getNormal(), getConstTerm(),
- line.getNormal(), line.getConstTerm(), intersection);
-
- if (result == INTERSECTS) {
- /* The relevant snapped distance is the distance to the closest snapped line, not the
- distance to the intersection. For example, when a box is almost aligned with a grid
- in both horizontal and vertical directions, the distance to the intersection of the
- grid lines will always be larger then the distance to a grid line. We will be snapping
- to the closest snapped point however, so if we ever want to snap to the intersection
- then the distance to it should at least be equal to the other distance, not greater
- than it, as that would rule the intersection out
- */
- distance = std::min(_distance, line.getDistance());
- //std::cout << "Intersected nicely, now getSIL distance = " << distance << std::endl;
- }
-
- return SnappedPoint(intersection, distance, result == INTERSECTS);
+ // Calculate the intersection of two lines, which are both within snapping range
+ // One could be a grid line, whereas the other could be a guide line
+ // The point of intersection should be considered for snapping, but might be outside the snapping range
+
+ Geom::OptCrossing inters = Geom::OptCrossing(); // empty by default
+ try
+ {
+ inters = Geom::intersection(getLine(), line.getLine());
+ }
+ catch (Geom::InfiniteSolutions e)
+ {
+ // We're probably dealing with parallel lines, so they don't really cross
+ inters = Geom::OptCrossing();
+ }
+
+ if (inters) {
+ Geom::Point inters_pt = getLine().pointAt((*inters).ta);
+ /* If a snapper has been told to "always snap", then this one should be preferred
+ * over the other, if that other one has not been told so. (The preferred snapper
+ * will be labelled "primary" below)
+ */
+ bool const c1 = this->getAlwaysSnap() && !line.getAlwaysSnap();
+ /* If neither or both have been told to "always snap", then cast a vote based on
+ * the snapped distance. For this we should consider the distance to the snapped
+ * line or to the intersection
+ */
+ bool const c2 = _distance < line.getSnapDistance();
+ bool const use_this_as_primary = c1 || c2;
+ Inkscape::SnappedLine const *primarySL = use_this_as_primary ? this : &line;
+ Inkscape::SnappedLine const *secondarySL = use_this_as_primary ? &line : this;
+ Geom::Coord primaryDist = use_this_as_primary ? Geom::L2(inters_pt - this->getPoint()) : Geom::L2(inters_pt - line.getPoint());
+ Geom::Coord secondaryDist = use_this_as_primary ? Geom::L2(inters_pt - line.getPoint()) : Geom::L2(inters_pt - this->getPoint());
+ return SnappedPoint(inters_pt, Inkscape::SNAPSOURCE_UNDEFINED, primarySL->getSourceNum(), Inkscape::SNAPTARGET_UNDEFINED, primaryDist, primarySL->getTolerance(), primarySL->getAlwaysSnap(), true, false, true,
+ secondaryDist, secondarySL->getTolerance(), secondarySL->getAlwaysSnap());
+ // The type of the snap target is yet undefined, as we cannot tell whether
+ // we're snapping to grid or the guide lines; must be set by on a higher level
+ }
+
+ // No intersection
+ return SnappedPoint(Geom::Point(NR_HUGE, NR_HUGE), SNAPSOURCE_UNDEFINED, 0, SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false, false, false, NR_HUGE, 0, false);
+}
+
+// search for the closest snapped line segment
+bool getClosestSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedLineSegment &result)
+{
+ bool success = false;
+
+ for (std::list<Inkscape::SnappedLineSegment>::const_iterator i = list.begin(); i != list.end(); i++) {
+ if ((i == list.begin()) || (*i).getSnapDistance() < result.getSnapDistance()) {
+ result = *i;
+ success = true;
+ }
+ }
+
+ return success;
+}
+
+// search for the closest intersection of two snapped line segments, which are both member of the same collection
+bool getClosestIntersectionSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedPoint &result)
+{
+ bool success = false;
+
+ for (std::list<Inkscape::SnappedLineSegment>::const_iterator i = list.begin(); i != list.end(); i++) {
+ std::list<Inkscape::SnappedLineSegment>::const_iterator j = i;
+ j++;
+ for (; j != list.end(); j++) {
+ Inkscape::SnappedPoint sp = (*i).intersect(*j);
+ if (sp.getAtIntersection()) {
+ // if it's the first point
+ bool const c1 = !success;
+ // or, if it's closer
+ bool const c2 = sp.getSnapDistance() < result.getSnapDistance();
+ // or, if it's just then look at the other distance
+ // (only relevant for snapped points which are at an intersection
+ bool const c3 = (sp.getSnapDistance() == result.getSnapDistance()) && (sp.getSecondSnapDistance() < result.getSecondSnapDistance());
+ // then prefer this point over the previous one
+ if (c1 || c2 || c3) {
+ result = sp;
+ success = true;
+ }
+ }
+ }
+ }
+
+ return success;
}
// search for the closest snapped line
-bool getClosestSL(std::list<Inkscape::SnappedLine> &list, Inkscape::SnappedLine &result)
+bool getClosestSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedLine &result)
{
- bool success = false;
-
- for (std::list<Inkscape::SnappedLine>::const_iterator i = list.begin(); i != list.end(); i++) {
- if ((i == list.begin()) || (*i).getDistance() < result.getDistance()) {
- result = *i;
- success = true;
- }
- }
-
- return success;
+ bool success = false;
+
+ for (std::list<Inkscape::SnappedLine>::const_iterator i = list.begin(); i != list.end(); i++) {
+ if ((i == list.begin()) || (*i).getSnapDistance() < result.getSnapDistance()) {
+ result = *i;
+ success = true;
+ }
+ }
+
+ return success;
}
// search for the closest intersection of two snapped lines, which are both member of the same collection
-bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> &list, Inkscape::SnappedPoint &result)
+bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedPoint &result)
{
- bool success = false;
-
- for (std::list<Inkscape::SnappedLine>::const_iterator i = list.begin(); i != list.end(); i++) {
- std::list<Inkscape::SnappedLine>::const_iterator j = i;
- j++;
- for (; j != list.end(); j++) {
- Inkscape::SnappedPoint sp = (*i).intersect(*j);
- if (sp.getAtIntersection()) {
- if (!success || sp.getDistance() < result.getDistance()) {
- // !success because the first intersection cannot be compared to a previous one
- result = sp;
- success = true;
- }
- }
- }
- }
-
- return success;
+ bool success = false;
+
+ for (std::list<Inkscape::SnappedLine>::const_iterator i = list.begin(); i != list.end(); i++) {
+ std::list<Inkscape::SnappedLine>::const_iterator j = i;
+ j++;
+ for (; j != list.end(); j++) {
+ Inkscape::SnappedPoint sp = (*i).intersect(*j);
+ if (sp.getAtIntersection()) {
+ // if it's the first point
+ bool const c1 = !success;
+ // or, if it's closer
+ bool const c2 = sp.getSnapDistance() < result.getSnapDistance();
+ // or, if it's just then look at the other distance
+ // (only relevant for snapped points which are at an intersection
+ bool const c3 = (sp.getSnapDistance() == result.getSnapDistance()) && (sp.getSecondSnapDistance() < result.getSecondSnapDistance());
+ // then prefer this point over the previous one
+ if (c1 || c2 || c3) {
+ result = sp;
+ success = true;
+ }
+ }
+ }
+ }
+
+ return success;
}
// search for the closest intersection of two snapped lines, which are in two different collections
-bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> &list1, std::list<Inkscape::SnappedLine> &list2, Inkscape::SnappedPoint &result)
+bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list1, std::list<Inkscape::SnappedLine> const &list2, Inkscape::SnappedPoint &result)
{
- bool success = false;
-
- for (std::list<Inkscape::SnappedLine>::const_iterator i = list1.begin(); i != list1.end(); i++) {
- for (std::list<Inkscape::SnappedLine>::const_iterator j = list2.begin(); j != list2.end(); j++) {
- Inkscape::SnappedPoint sp = (*i).intersect(*j);
- if (sp.getAtIntersection()) {
- if (!success || sp.getDistance() < result.getDistance()) {
- // !success because the first intersection cannot be compared to a previous one
- result = sp;
- success = true;
- }
- }
- }
- }
-
- return success;
+ bool success = false;
+
+ for (std::list<Inkscape::SnappedLine>::const_iterator i = list1.begin(); i != list1.end(); i++) {
+ for (std::list<Inkscape::SnappedLine>::const_iterator j = list2.begin(); j != list2.end(); j++) {
+ Inkscape::SnappedPoint sp = (*i).intersect(*j);
+ if (sp.getAtIntersection()) {
+ // if it's the first point
+ bool const c1 = !success;
+ // or, if it's closer
+ bool const c2 = sp.getSnapDistance() < result.getSnapDistance();
+ // or, if it's just then look at the other distance
+ // (only relevant for snapped points which are at an intersection
+ bool const c3 = (sp.getSnapDistance() == result.getSnapDistance()) && (sp.getSecondSnapDistance() < result.getSecondSnapDistance());
+ // then prefer this point over the previous one
+ if (c1 || c2 || c3) {
+ result = sp;
+ success = true;
+ }
+ }
+ }
+ }
+
+ return success;
}
/*