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-rw-r--r--src/livarot/sweep-tree.cpp567
1 files changed, 567 insertions, 0 deletions
diff --git a/src/livarot/sweep-tree.cpp b/src/livarot/sweep-tree.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#include "livarot/sweep-event-queue.h"
+#include "livarot/sweep-tree-list.h"
+#include "livarot/sweep-tree.h"
+#include "livarot/sweep-event.h"
+#include "livarot/Shape.h"
+
+
+/*
+ * the AVL tree holding the edges intersecting the sweepline
+ * that structure is very sensitive to anything
+ * you have edges stored in nodes, the nodes are sorted in increasing x-order of intersection
+ * with the sweepline, you have the 2 potential intersections of the edge in the node with its
+ * neighbours, plus the fact that it's stored in an array that's realloc'd
+ */
+
+SweepTree::SweepTree()
+{
+ src = nullptr;
+ bord = -1;
+ startPoint = -1;
+ evt[LEFT] = evt[RIGHT] = nullptr;
+ sens = true;
+ //invDirLength=1;
+}
+
+SweepTree::~SweepTree()
+{
+ MakeDelete();
+}
+
+void
+SweepTree::MakeNew(Shape *iSrc, int iBord, int iWeight, int iStartPoint)
+{
+ AVLTree::MakeNew();
+ ConvertTo(iSrc, iBord, iWeight, iStartPoint);
+}
+
+void
+SweepTree::ConvertTo(Shape *iSrc, int iBord, int iWeight, int iStartPoint)
+{
+ src = iSrc;
+ bord = iBord;
+ evt[LEFT] = evt[RIGHT] = nullptr;
+ startPoint = iStartPoint;
+ if (src->getEdge(bord).st < src->getEdge(bord).en) {
+ if (iWeight >= 0)
+ sens = true;
+ else
+ sens = false;
+ } else {
+ if (iWeight >= 0)
+ sens = false;
+ else
+ sens = true;
+ }
+ //invDirLength=src->eData[bord].isqlength;
+ //invDirLength=1/sqrt(src->getEdge(bord).dx*src->getEdge(bord).dx+src->getEdge(bord).dy*src->getEdge(bord).dy);
+}
+
+
+void SweepTree::MakeDelete()
+{
+ for (int i = 0; i < 2; i++) {
+ if (evt[i]) {
+ evt[i]->sweep[1 - i] = nullptr;
+ }
+ evt[i] = nullptr;
+ }
+
+ AVLTree::MakeDelete();
+}
+
+
+// find the position at which node "newOne" should be inserted in the subtree rooted here
+// we want to order with respect to the order of intersections with the sweepline, currently
+// lying at y=px[1].
+// px is the upper endpoint of newOne
+int
+SweepTree::Find(Geom::Point const &px, SweepTree *newOne, SweepTree *&insertL,
+ SweepTree *&insertR, bool sweepSens)
+{
+ // get the edge associated with this node: one point+one direction
+ // since we're dealing with line, the direction (bNorm) is taken downwards
+ Geom::Point bOrig, bNorm;
+ bOrig = src->pData[src->getEdge(bord).st].rx;
+ bNorm = src->eData[bord].rdx;
+ if (src->getEdge(bord).st > src->getEdge(bord).en) {
+ bNorm = -bNorm;
+ }
+ // rotate to get the normal to the edge
+ bNorm=bNorm.ccw();
+
+ Geom::Point diff;
+ diff = px - bOrig;
+
+ // compute (px-orig)^dir to know on which side of this edge the point px lies
+ double y = 0;
+ //if ( startPoint == newOne->startPoint ) {
+ // y=0;
+ //} else {
+ y = dot(bNorm, diff);
+ //}
+ //y*=invDirLength;
+ if (fabs(y) < 0.000001) {
+ // that damn point px lies on me, so i need to consider to direction of the edge in
+ // newOne to know if it goes toward my left side or my right side
+ // sweepSens is needed (actually only used by the Scan() functions) because if the sweepline goes upward,
+ // signs change
+ // prendre en compte les directions
+ Geom::Point nNorm;
+ nNorm = newOne->src->eData[newOne->bord].rdx;
+ if (newOne->src->getEdge(newOne->bord).st >
+ newOne->src->getEdge(newOne->bord).en)
+ {
+ nNorm = -nNorm;
+ }
+ nNorm=nNorm.ccw();
+
+ if (sweepSens) {
+ y = cross(bNorm, nNorm);
+ } else {
+ y = cross(nNorm, bNorm);
+ }
+ if (y == 0) {
+ y = dot(bNorm, nNorm);
+ if (y == 0) {
+ insertL = this;
+ insertR = static_cast<SweepTree *>(elem[RIGHT]);
+ return found_exact;
+ }
+ }
+ }
+ if (y < 0) {
+ if (child[LEFT]) {
+ return (static_cast<SweepTree *>(child[LEFT]))->Find(px, newOne,
+ insertL, insertR,
+ sweepSens);
+ } else {
+ insertR = this;
+ insertL = static_cast<SweepTree *>(elem[LEFT]);
+ if (insertL) {
+ return found_between;
+ } else {
+ return found_on_left;
+ }
+ }
+ } else {
+ if (child[RIGHT]) {
+ return (static_cast<SweepTree *>(child[RIGHT]))->Find(px, newOne,
+ insertL, insertR,
+ sweepSens);
+ } else {
+ insertL = this;
+ insertR = static_cast<SweepTree *>(elem[RIGHT]);
+ if (insertR) {
+ return found_between;
+ } else {
+ return found_on_right;
+ }
+ }
+ }
+ return not_found;
+}
+
+// only find a point's position
+int
+SweepTree::Find(Geom::Point const &px, SweepTree * &insertL,
+ SweepTree * &insertR)
+{
+ Geom::Point bOrig, bNorm;
+ bOrig = src->pData[src->getEdge(bord).st].rx;
+ bNorm = src->eData[bord].rdx;
+ if (src->getEdge(bord).st > src->getEdge(bord).en)
+ {
+ bNorm = -bNorm;
+ }
+ bNorm=bNorm.ccw();
+
+ Geom::Point diff;
+ diff = px - bOrig;
+
+ double y = 0;
+ y = dot(bNorm, diff);
+ if (y == 0)
+ {
+ insertL = this;
+ insertR = static_cast<SweepTree *>(elem[RIGHT]);
+ return found_exact;
+ }
+ if (y < 0)
+ {
+ if (child[LEFT])
+ {
+ return (static_cast<SweepTree *>(child[LEFT]))->Find(px, insertL,
+ insertR);
+ }
+ else
+ {
+ insertR = this;
+ insertL = static_cast<SweepTree *>(elem[LEFT]);
+ if (insertL)
+ {
+ return found_between;
+ }
+ else
+ {
+ return found_on_left;
+ }
+ }
+ }
+ else
+ {
+ if (child[RIGHT])
+ {
+ return (static_cast<SweepTree *>(child[RIGHT]))->Find(px, insertL,
+ insertR);
+ }
+ else
+ {
+ insertL = this;
+ insertR = static_cast<SweepTree *>(elem[RIGHT]);
+ if (insertR)
+ {
+ return found_between;
+ }
+ else
+ {
+ return found_on_right;
+ }
+ }
+ }
+ return not_found;
+}
+
+void
+SweepTree::RemoveEvents(SweepEventQueue & queue)
+{
+ RemoveEvent(queue, LEFT);
+ RemoveEvent(queue, RIGHT);
+}
+
+void SweepTree::RemoveEvent(SweepEventQueue &queue, Side s)
+{
+ if (evt[s]) {
+ queue.remove(evt[s]);
+ evt[s] = nullptr;
+ }
+}
+
+int
+SweepTree::Remove(SweepTreeList &list, SweepEventQueue &queue,
+ bool rebalance)
+{
+ RemoveEvents(queue);
+ AVLTree *tempR = static_cast<AVLTree *>(list.racine);
+ int err = AVLTree::Remove(tempR, rebalance);
+ list.racine = static_cast<SweepTree *>(tempR);
+ MakeDelete();
+ if (list.nbTree <= 1)
+ {
+ list.nbTree = 0;
+ list.racine = nullptr;
+ }
+ else
+ {
+ if (list.racine == list.trees + (list.nbTree - 1))
+ list.racine = this;
+ list.trees[--list.nbTree].Relocate(this);
+ }
+ return err;
+}
+
+int
+SweepTree::Insert(SweepTreeList &list, SweepEventQueue &queue,
+ Shape *iDst, int iAtPoint, bool rebalance, bool sweepSens)
+{
+ if (list.racine == nullptr)
+ {
+ list.racine = this;
+ return avl_no_err;
+ }
+ SweepTree *insertL = nullptr;
+ SweepTree *insertR = nullptr;
+ int insertion =
+ list.racine->Find(iDst->getPoint(iAtPoint).x, this,
+ insertL, insertR, sweepSens);
+
+ if (insertion == found_exact) {
+ if (insertR) {
+ insertR->RemoveEvent(queue, LEFT);
+ }
+ if (insertL) {
+ insertL->RemoveEvent(queue, RIGHT);
+ }
+
+ } else if (insertion == found_between) {
+ insertR->RemoveEvent(queue, LEFT);
+ insertL->RemoveEvent(queue, RIGHT);
+ }
+
+ AVLTree *tempR = static_cast<AVLTree *>(list.racine);
+ int err =
+ AVLTree::Insert(tempR, insertion, static_cast<AVLTree *>(insertL),
+ static_cast<AVLTree *>(insertR), rebalance);
+ list.racine = static_cast<SweepTree *>(tempR);
+ return err;
+}
+
+// insertAt() is a speedup on the regular sweepline: if the polygon contains a point of high degree, you
+// get a set of edge that are to be added in the same position. thus you insert one edge with a regular insert(),
+// and then insert all the other in a doubly-linked list fashion. this avoids the Find() call, but is O(d^2) worst-case
+// where d is the number of edge to add in this fashion. hopefully d remains small
+
+int
+SweepTree::InsertAt(SweepTreeList &list, SweepEventQueue &queue,
+ Shape */*iDst*/, SweepTree *insNode, int fromPt,
+ bool rebalance, bool sweepSens)
+{
+ if (list.racine == nullptr)
+ {
+ list.racine = this;
+ return avl_no_err;
+ }
+
+ Geom::Point fromP;
+ fromP = src->pData[fromPt].rx;
+ Geom::Point nNorm;
+ nNorm = src->getEdge(bord).dx;
+ if (src->getEdge(bord).st > src->getEdge(bord).en)
+ {
+ nNorm = -nNorm;
+ }
+ if (sweepSens == false)
+ {
+ nNorm = -nNorm;
+ }
+
+ Geom::Point bNorm;
+ bNorm = insNode->src->getEdge(insNode->bord).dx;
+ if (insNode->src->getEdge(insNode->bord).st >
+ insNode->src->getEdge(insNode->bord).en)
+ {
+ bNorm = -bNorm;
+ }
+
+ SweepTree *insertL = nullptr;
+ SweepTree *insertR = nullptr;
+ double ang = cross(bNorm, nNorm);
+ if (ang == 0)
+ {
+ insertL = insNode;
+ insertR = static_cast<SweepTree *>(insNode->elem[RIGHT]);
+ }
+ else if (ang > 0)
+ {
+ insertL = insNode;
+ insertR = static_cast<SweepTree *>(insNode->elem[RIGHT]);
+
+ while (insertL)
+ {
+ if (insertL->src == src)
+ {
+ if (insertL->src->getEdge(insertL->bord).st != fromPt
+ && insertL->src->getEdge(insertL->bord).en != fromPt)
+ {
+ break;
+ }
+ }
+ else
+ {
+ int ils = insertL->src->getEdge(insertL->bord).st;
+ int ile = insertL->src->getEdge(insertL->bord).en;
+ if ((insertL->src->pData[ils].rx[0] != fromP[0]
+ || insertL->src->pData[ils].rx[1] != fromP[1])
+ && (insertL->src->pData[ile].rx[0] != fromP[0]
+ || insertL->src->pData[ile].rx[1] != fromP[1]))
+ {
+ break;
+ }
+ }
+ bNorm = insertL->src->getEdge(insertL->bord).dx;
+ if (insertL->src->getEdge(insertL->bord).st >
+ insertL->src->getEdge(insertL->bord).en)
+ {
+ bNorm = -bNorm;
+ }
+ ang = cross(bNorm, nNorm);
+ if (ang <= 0)
+ {
+ break;
+ }
+ insertR = insertL;
+ insertL = static_cast<SweepTree *>(insertR->elem[LEFT]);
+ }
+ }
+ else if (ang < 0)
+ {
+ insertL = insNode;
+ insertR = static_cast<SweepTree *>(insNode->elem[RIGHT]);
+
+ while (insertR)
+ {
+ if (insertR->src == src)
+ {
+ if (insertR->src->getEdge(insertR->bord).st != fromPt
+ && insertR->src->getEdge(insertR->bord).en != fromPt)
+ {
+ break;
+ }
+ }
+ else
+ {
+ int ils = insertR->src->getEdge(insertR->bord).st;
+ int ile = insertR->src->getEdge(insertR->bord).en;
+ if ((insertR->src->pData[ils].rx[0] != fromP[0]
+ || insertR->src->pData[ils].rx[1] != fromP[1])
+ && (insertR->src->pData[ile].rx[0] != fromP[0]
+ || insertR->src->pData[ile].rx[1] != fromP[1]))
+ {
+ break;
+ }
+ }
+ bNorm = insertR->src->getEdge(insertR->bord).dx;
+ if (insertR->src->getEdge(insertR->bord).st >
+ insertR->src->getEdge(insertR->bord).en)
+ {
+ bNorm = -bNorm;
+ }
+ ang = cross(bNorm, nNorm);
+ if (ang > 0)
+ {
+ break;
+ }
+ insertL = insertR;
+ insertR = static_cast<SweepTree *>(insertL->elem[RIGHT]);
+ }
+ }
+
+ int insertion = found_between;
+
+ if (insertL == nullptr) {
+ insertion = found_on_left;
+ }
+ if (insertR == nullptr) {
+ insertion = found_on_right;
+ }
+
+ if (insertion == found_exact) {
+ /* FIXME: surely this can never be called? */
+ if (insertR) {
+ insertR->RemoveEvent(queue, LEFT);
+ }
+ if (insertL) {
+ insertL->RemoveEvent(queue, RIGHT);
+ }
+ } else if (insertion == found_between) {
+ insertR->RemoveEvent(queue, LEFT);
+ insertL->RemoveEvent(queue, RIGHT);
+ }
+
+ AVLTree *tempR = static_cast<AVLTree *>(list.racine);
+ int err =
+ AVLTree::Insert(tempR, insertion, static_cast<AVLTree *>(insertL),
+ static_cast<AVLTree *>(insertR), rebalance);
+ list.racine = static_cast<SweepTree *>(tempR);
+ return err;
+}
+
+void
+SweepTree::Relocate(SweepTree * to)
+{
+ if (this == to)
+ return;
+ AVLTree::Relocate(to);
+ to->src = src;
+ to->bord = bord;
+ to->sens = sens;
+ to->evt[LEFT] = evt[LEFT];
+ to->evt[RIGHT] = evt[RIGHT];
+ to->startPoint = startPoint;
+ if (unsigned(bord) < src->swsData.size())
+ src->swsData[bord].misc = to;
+ if (unsigned(bord) < src->swrData.size())
+ src->swrData[bord].misc = to;
+ if (evt[LEFT])
+ evt[LEFT]->sweep[RIGHT] = to;
+ if (evt[RIGHT])
+ evt[RIGHT]->sweep[LEFT] = to;
+}
+
+// TODO check if ignoring these parameters is bad
+void
+SweepTree::SwapWithRight(SweepTreeList &/*list*/, SweepEventQueue &/*queue*/)
+{
+ SweepTree *tL = this;
+ SweepTree *tR = static_cast<SweepTree *>(elem[RIGHT]);
+
+ tL->src->swsData[tL->bord].misc = tR;
+ tR->src->swsData[tR->bord].misc = tL;
+
+ {
+ Shape *swap = tL->src;
+ tL->src = tR->src;
+ tR->src = swap;
+ }
+ {
+ int swap = tL->bord;
+ tL->bord = tR->bord;
+ tR->bord = swap;
+ }
+ {
+ int swap = tL->startPoint;
+ tL->startPoint = tR->startPoint;
+ tR->startPoint = swap;
+ }
+ //{double swap=tL->invDirLength;tL->invDirLength=tR->invDirLength;tR->invDirLength=swap;}
+ {
+ bool swap = tL->sens;
+ tL->sens = tR->sens;
+ tR->sens = swap;
+ }
+}
+
+void
+SweepTree::Avance(Shape */*dstPts*/, int /*curPoint*/, Shape */*a*/, Shape */*b*/)
+{
+ return;
+/* if ( curPoint != startPoint ) {
+ int nb=-1;
+ if ( sens ) {
+// nb=dstPts->AddEdge(startPoint,curPoint);
+ } else {
+// nb=dstPts->AddEdge(curPoint,startPoint);
+ }
+ if ( nb >= 0 ) {
+ dstPts->swsData[nb].misc=(void*)((src==b)?1:0);
+ int wp=waitingPoint;
+ dstPts->eData[nb].firstLinkedPoint=waitingPoint;
+ waitingPoint=-1;
+ while ( wp >= 0 ) {
+ dstPts->pData[wp].edgeOnLeft=nb;
+ wp=dstPts->pData[wp].nextLinkedPoint;
+ }
+ }
+ startPoint=curPoint;
+ }*/
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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