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-rw-r--r--src/livarot/PathStroke.cpp763
1 files changed, 763 insertions, 0 deletions
diff --git a/src/livarot/PathStroke.cpp b/src/livarot/PathStroke.cpp
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+++ b/src/livarot/PathStroke.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors:
+ * see git history
+ * Fred
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "Path.h"
+#include "Shape.h"
+#include <2geom/transforms.h>
+
+/*
+ * stroking polylines into a Shape instance
+ * grunt work.
+ * if the goal is to raster the stroke, polyline stroke->polygon->uncrossed polygon->raster is grossly
+ * inefficient (but reuse the intersector, so that's what a lazy programmer like me does). the correct way would be
+ * to set up a supersampled buffer, raster each polyline stroke's part (one part per segment in the polyline, plus
+ * each join) because these are all convex polygons, then transform in alpha values
+ */
+
+// until i find something better
+static Geom::Point StrokeNormalize(const Geom::Point value) {
+ double length = L2(value);
+ if ( length < 0.0000001 ) {
+ return Geom::Point(0, 0);
+ } else {
+ return value/length;
+ }
+}
+
+// faster version if length is known
+static Geom::Point StrokeNormalize(const Geom::Point value, double length) {
+ if ( length < 0.0000001 ) {
+ return Geom::Point(0, 0);
+ } else {
+ return value/length;
+ }
+}
+
+void Path::Stroke(Shape *dest, bool doClose, double width, JoinType join,
+ ButtType butt, double miter, bool justAdd)
+{
+ if (dest == nullptr) {
+ return;
+ }
+
+ if (justAdd == false) {
+ dest->Reset(3 * pts.size(), 3 * pts.size());
+ }
+
+ dest->MakeBackData(false);
+
+ int lastM = 0;
+ while (lastM < int(pts.size())) {
+
+ int lastP = lastM + 1;
+ while (lastP < int(pts.size()) // select one subpath
+ && (pts[lastP].isMoveTo == polyline_lineto
+ || pts[lastP].isMoveTo == polyline_forced))
+ {
+ lastP++;
+ }
+
+ if ( lastP > lastM+1 ) {
+ Geom::Point sbStart = pts[lastM].p;
+ Geom::Point sbEnd = pts[lastP - 1].p;
+ // if ( pts[lastP - 1].closed ) { // this is correct, but this bugs text rendering (doesn't close text stroke)...
+ if ( Geom::LInfty(sbEnd-sbStart) < 0.00001 ) { // why close lines that shouldn't be closed?
+ // ah I see, because close is defined here for
+ // a whole path and should be defined per subpath.
+ // debut==fin => ferme (on devrait garder un element pour les close(), mais tant pis)
+ DoStroke(lastM, lastP - lastM, dest, true, width, join, butt, miter, true);
+ } else {
+ DoStroke(lastM, lastP - lastM, dest, doClose, width, join, butt, miter, true);
+ }
+ } else if (butt == butt_round) { // special case: zero length round butt is a circle
+ int last[2] = { -1, -1 };
+ Geom::Point dir;
+ dir[0] = 1;
+ dir[1] = 0;
+ Geom::Point pos = pts[lastM].p;
+ DoButt(dest, width, butt, pos, dir, last[RIGHT], last[LEFT]);
+ int end[2];
+ dir = -dir;
+ DoButt(dest, width, butt, pos, dir, end[LEFT], end[RIGHT]);
+ dest->AddEdge (end[LEFT], last[LEFT]);
+ dest->AddEdge (last[RIGHT], end[RIGHT]);
+ }
+ lastM = lastP;
+ }
+}
+
+void Path::DoStroke(int off, int N, Shape *dest, bool doClose, double width, JoinType join,
+ ButtType butt, double miter, bool /*justAdd*/)
+{
+ if (N <= 1) {
+ return;
+ }
+
+ Geom::Point prevP, nextP;
+ int prevI, nextI;
+ int upTo;
+
+ int curI = 0;
+ Geom::Point curP = pts[off].p;
+
+ if (doClose) {
+
+ prevI = N - 1;
+ while (prevI > 0) {
+ prevP = pts[off + prevI].p;
+ Geom::Point diff = curP - prevP;
+ double dist = dot(diff, diff);
+ if (dist > 0.001) {
+ break;
+ }
+ prevI--;
+ }
+ if (prevI <= 0) {
+ return;
+ }
+ upTo = prevI;
+
+ } else {
+
+ prevP = curP;
+ prevI = curI;
+ upTo = N - 1;
+ }
+
+ {
+ nextI = 1;
+ while (nextI <= upTo) {
+ nextP = pts[off + nextI].p;
+ Geom::Point diff = curP - nextP;
+ double dist = dot(diff, diff);
+ if (dist > 0.0) { // more tolerance for the first distance, to give the cap the right direction
+ break;
+ }
+ nextI++;
+ }
+ if (nextI > upTo) {
+ if (butt == butt_round) { // special case: zero length round butt is a circle
+ int last[2] = { -1, -1 };
+ Geom::Point dir;
+ dir[0] = 1;
+ dir[1] = 0;
+ DoButt(dest, width, butt, curP, dir, last[RIGHT], last[LEFT]);
+ int end[2];
+ dir = -dir;
+ DoButt(dest, width, butt, curP, dir, end[LEFT], end[RIGHT]);
+ dest->AddEdge (end[LEFT], last[LEFT]);
+ dest->AddEdge (last[RIGHT], end[RIGHT]);
+ }
+ return;
+ }
+ }
+
+ int start[2] = { -1, -1 };
+ int last[2] = { -1, -1 };
+ Geom::Point prevD = curP - prevP;
+ Geom::Point nextD = nextP - curP;
+ double prevLe = Geom::L2(prevD);
+ double nextLe = Geom::L2(nextD);
+ prevD = StrokeNormalize(prevD, prevLe);
+ nextD = StrokeNormalize(nextD, nextLe);
+
+ if (doClose) {
+ DoJoin(dest, width, join, curP, prevD, nextD, miter, prevLe, nextLe, start, last);
+ } else {
+ nextD = -nextD;
+ DoButt(dest, width, butt, curP, nextD, last[RIGHT], last[LEFT]);
+ nextD = -nextD;
+ }
+
+ do {
+ prevP = curP;
+ prevI = curI;
+ curP = nextP;
+ curI = nextI;
+ prevD = nextD;
+ prevLe = nextLe;
+ nextI++;
+ while (nextI <= upTo) {
+ nextP = pts[off + nextI].p;
+ Geom::Point diff = curP - nextP;
+ double dist = dot(diff, diff);
+ if (dist > 0.001 || (nextI == upTo && dist > 0.0)) { // more tolerance for the last distance too, for the right cap direction
+ break;
+ }
+ nextI++;
+ }
+ if (nextI > upTo) {
+ break;
+ }
+
+ nextD = nextP - curP;
+ nextLe = Geom::L2(nextD);
+ nextD = StrokeNormalize(nextD, nextLe);
+ int nSt[2] = { -1, -1 };
+ int nEn[2] = { -1, -1 };
+ DoJoin(dest, width, join, curP, prevD, nextD, miter, prevLe, nextLe, nSt, nEn);
+ dest->AddEdge(nSt[LEFT], last[LEFT]);
+ last[LEFT] = nEn[LEFT];
+ dest->AddEdge(last[RIGHT], nSt[RIGHT]);
+ last[RIGHT] = nEn[RIGHT];
+ } while (nextI <= upTo);
+
+ if (doClose) {
+ /* prevP=curP;
+ prevI=curI;
+ curP=nextP;
+ curI=nextI;
+ prevD=nextD;*/
+ nextP = pts[off].p;
+
+ nextD = nextP - curP;
+ nextLe = Geom::L2(nextD);
+ nextD = StrokeNormalize(nextD, nextLe);
+ int nSt[2] = { -1, -1 };
+ int nEn[2] = { -1, -1 };
+ DoJoin(dest, width, join, curP, prevD, nextD, miter, prevLe, nextLe, nSt, nEn);
+ dest->AddEdge (nSt[LEFT], last[LEFT]);
+ last[LEFT] = nEn[LEFT];
+ dest->AddEdge (last[RIGHT], nSt[RIGHT]);
+ last[RIGHT] = nEn[RIGHT];
+
+ dest->AddEdge (start[LEFT], last[LEFT]);
+ dest->AddEdge (last[RIGHT], start[RIGHT]);
+
+ } else {
+
+ int end[2];
+ DoButt (dest, width, butt, curP, prevD, end[LEFT], end[RIGHT]);
+ dest->AddEdge (end[LEFT], last[LEFT]);
+ dest->AddEdge (last[RIGHT], end[RIGHT]);
+ }
+}
+
+
+void Path::DoButt(Shape *dest, double width, ButtType butt, Geom::Point pos, Geom::Point dir,
+ int &leftNo, int &rightNo)
+{
+ Geom::Point nor;
+ nor = dir.ccw();
+
+ if (butt == butt_square)
+ {
+ Geom::Point x;
+ x = pos + width * dir + width * nor;
+ int bleftNo = dest->AddPoint (x);
+ x = pos + width * dir - width * nor;
+ int brightNo = dest->AddPoint (x);
+ x = pos + width * nor;
+ leftNo = dest->AddPoint (x);
+ x = pos - width * nor;
+ rightNo = dest->AddPoint (x);
+ dest->AddEdge (rightNo, brightNo);
+ dest->AddEdge (brightNo, bleftNo);
+ dest->AddEdge (bleftNo, leftNo);
+ }
+ else if (butt == butt_pointy)
+ {
+ leftNo = dest->AddPoint (pos + width * nor);
+ rightNo = dest->AddPoint (pos - width * nor);
+ int mid = dest->AddPoint (pos + width * dir);
+ dest->AddEdge (rightNo, mid);
+ dest->AddEdge (mid, leftNo);
+ }
+ else if (butt == butt_round)
+ {
+ const Geom::Point sx = pos + width * nor;
+ const Geom::Point ex = pos - width * nor;
+ leftNo = dest->AddPoint (sx);
+ rightNo = dest->AddPoint (ex);
+
+ RecRound (dest, rightNo, leftNo, ex, sx, -nor, nor, pos, width);
+ }
+ else
+ {
+ leftNo = dest->AddPoint (pos + width * nor);
+ rightNo = dest->AddPoint (pos - width * nor);
+ dest->AddEdge (rightNo, leftNo);
+ }
+}
+
+
+void Path::DoJoin (Shape *dest, double width, JoinType join, Geom::Point pos, Geom::Point prev,
+ Geom::Point next, double miter, double /*prevL*/, double /*nextL*/,
+ int *stNo, int *enNo)
+{
+ Geom::Point pnor = prev.ccw();
+ Geom::Point nnor = next.ccw();
+ double angSi = cross(prev, next);
+
+ /* FIXED: this special case caused bug 1028953 */
+ if (angSi > -0.0001 && angSi < 0.0001) {
+ double angCo = dot (prev, next);
+ if (angCo > 0.9999) {
+ // tout droit
+ stNo[LEFT] = enNo[LEFT] = dest->AddPoint(pos + width * pnor);
+ stNo[RIGHT] = enNo[RIGHT] = dest->AddPoint(pos - width * pnor);
+ } else {
+ // demi-tour
+ const Geom::Point sx = pos + width * pnor;
+ const Geom::Point ex = pos - width * pnor;
+ stNo[LEFT] = enNo[RIGHT] = dest->AddPoint (sx);
+ stNo[RIGHT] = enNo[LEFT] = dest->AddPoint (ex);
+ if (join == join_round) {
+ RecRound (dest, enNo[LEFT], stNo[LEFT], ex, sx, -pnor, pnor, pos, width);
+ dest->AddEdge(stNo[RIGHT], enNo[RIGHT]);
+ } else {
+ dest->AddEdge(enNo[LEFT], stNo[LEFT]);
+ dest->AddEdge(stNo[RIGHT], enNo[RIGHT]); // two times because both are crossing each other
+ }
+ }
+ return;
+ }
+
+ if (angSi < 0) {
+ int midNo = dest->AddPoint(pos);
+ stNo[LEFT] = dest->AddPoint(pos + width * pnor);
+ enNo[LEFT] = dest->AddPoint(pos + width * nnor);
+ dest->AddEdge(enNo[LEFT], midNo);
+ dest->AddEdge(midNo, stNo[LEFT]);
+
+ if (join == join_pointy) {
+
+ stNo[RIGHT] = dest->AddPoint(pos - width * pnor);
+ enNo[RIGHT] = dest->AddPoint(pos - width * nnor);
+
+ const Geom::Point biss = StrokeNormalize(prev - next);
+ double c2 = dot(biss, nnor);
+ double l = width / c2;
+ double emiter = width * c2;
+ if (emiter < miter) {
+ emiter = miter;
+ }
+
+ if (fabs(l) < miter) {
+ int const n = dest->AddPoint(pos - l * biss);
+ dest->AddEdge(stNo[RIGHT], n);
+ dest->AddEdge(n, enNo[RIGHT]);
+ } else {
+ dest->AddEdge(stNo[RIGHT], enNo[RIGHT]);
+ }
+
+ } else if (join == join_round) {
+ Geom::Point sx = pos - width * pnor;
+ stNo[RIGHT] = dest->AddPoint(sx);
+ Geom::Point ex = pos - width * nnor;
+ enNo[RIGHT] = dest->AddPoint(ex);
+
+ RecRound(dest, stNo[RIGHT], enNo[RIGHT],
+ sx, ex, -pnor, -nnor, pos, width);
+
+ } else {
+ stNo[RIGHT] = dest->AddPoint(pos - width * pnor);
+ enNo[RIGHT] = dest->AddPoint(pos - width * nnor);
+ dest->AddEdge(stNo[RIGHT], enNo[RIGHT]);
+ }
+
+ } else {
+
+ int midNo = dest->AddPoint(pos);
+ stNo[RIGHT] = dest->AddPoint(pos - width * pnor);
+ enNo[RIGHT] = dest->AddPoint(pos - width * nnor);
+ dest->AddEdge(stNo[RIGHT], midNo);
+ dest->AddEdge(midNo, enNo[RIGHT]);
+
+ if (join == join_pointy) {
+
+ stNo[LEFT] = dest->AddPoint(pos + width * pnor);
+ enNo[LEFT] = dest->AddPoint(pos + width * nnor);
+
+ const Geom::Point biss = StrokeNormalize(next - prev);
+ double c2 = dot(biss, nnor);
+ double l = width / c2;
+ double emiter = width * c2;
+ if (emiter < miter) {
+ emiter = miter;
+ }
+ if ( fabs(l) < miter) {
+ int const n = dest->AddPoint (pos + l * biss);
+ dest->AddEdge (enNo[LEFT], n);
+ dest->AddEdge (n, stNo[LEFT]);
+ }
+ else
+ {
+ dest->AddEdge (enNo[LEFT], stNo[LEFT]);
+ }
+
+ } else if (join == join_round) {
+
+ Geom::Point sx = pos + width * pnor;
+ stNo[LEFT] = dest->AddPoint(sx);
+ Geom::Point ex = pos + width * nnor;
+ enNo[LEFT] = dest->AddPoint(ex);
+
+ RecRound(dest, enNo[LEFT], stNo[LEFT],
+ ex, sx, nnor, pnor, pos, width);
+
+ } else {
+ stNo[LEFT] = dest->AddPoint(pos + width * pnor);
+ enNo[LEFT] = dest->AddPoint(pos + width * nnor);
+ dest->AddEdge(enNo[LEFT], stNo[LEFT]);
+ }
+ }
+}
+
+ void
+Path::DoLeftJoin (Shape * dest, double width, JoinType join, Geom::Point pos,
+ Geom::Point prev, Geom::Point next, double miter, double /*prevL*/, double /*nextL*/,
+ int &leftStNo, int &leftEnNo,int pathID,int pieceID,double tID)
+{
+ Geom::Point pnor=prev.ccw();
+ Geom::Point nnor=next.ccw();
+ double angSi = cross(prev, next);
+ if (angSi > -0.0001 && angSi < 0.0001)
+ {
+ double angCo = dot (prev, next);
+ if (angCo > 0.9999)
+ {
+ // tout droit
+ leftEnNo = leftStNo = dest->AddPoint (pos + width * pnor);
+ }
+ else
+ {
+ // demi-tour
+ leftStNo = dest->AddPoint (pos + width * pnor);
+ leftEnNo = dest->AddPoint (pos - width * pnor);
+ int nEdge=dest->AddEdge (leftEnNo, leftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ return;
+ }
+ if (angSi < 0)
+ {
+ /* Geom::Point biss;
+ biss.x=next.x-prev.x;
+ biss.y=next.y-prev.y;
+ double c2=cross(next, biss);
+ double l=width/c2;
+ double projn=l*(dot(biss,next));
+ double projp=-l*(dot(biss,prev));
+ if ( projp <= 0.5*prevL && projn <= 0.5*nextL ) {
+ double x,y;
+ x=pos.x+l*biss.x;
+ y=pos.y+l*biss.y;
+ leftEnNo=leftStNo=dest->AddPoint(x,y);
+ } else {*/
+ leftStNo = dest->AddPoint (pos + width * pnor);
+ leftEnNo = dest->AddPoint (pos + width * nnor);
+// int midNo = dest->AddPoint (pos);
+// int nEdge=dest->AddEdge (leftEnNo, midNo);
+ int nEdge=dest->AddEdge (leftEnNo, leftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+// nEdge=dest->AddEdge (midNo, leftStNo);
+// if ( dest->hasBackData() ) {
+// dest->ebData[nEdge].pathID=pathID;
+// dest->ebData[nEdge].pieceID=pieceID;
+// dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+// }
+ // }
+ }
+ else
+ {
+ if (join == join_pointy)
+ {
+ leftStNo = dest->AddPoint (pos + width * pnor);
+ leftEnNo = dest->AddPoint (pos + width * nnor);
+
+ const Geom::Point biss = StrokeNormalize (pnor + nnor);
+ double c2 = dot (biss, nnor);
+ double l = width / c2;
+ double emiter = width * c2;
+ if (emiter < miter)
+ emiter = miter;
+ if (l <= emiter)
+ {
+ int nleftStNo = dest->AddPoint (pos + l * biss);
+ int nEdge=dest->AddEdge (leftEnNo, nleftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (nleftStNo, leftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ else
+ {
+ double s2 = cross(nnor, biss);
+ double dec = (l - emiter) * c2 / s2;
+ const Geom::Point tbiss=biss.ccw();
+
+ int nleftStNo = dest->AddPoint (pos + emiter * biss + dec * tbiss);
+ int nleftEnNo = dest->AddPoint (pos + emiter * biss - dec * tbiss);
+ int nEdge=dest->AddEdge (nleftEnNo, nleftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (leftEnNo, nleftEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (nleftStNo, leftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ }
+ else if (join == join_round)
+ {
+ const Geom::Point sx = pos + width * pnor;
+ leftStNo = dest->AddPoint (sx);
+ const Geom::Point ex = pos + width * nnor;
+ leftEnNo = dest->AddPoint (ex);
+
+ RecRound(dest, leftEnNo, leftStNo,
+ sx, ex, pnor, nnor ,pos, width);
+
+ }
+ else
+ {
+ leftStNo = dest->AddPoint (pos + width * pnor);
+ leftEnNo = dest->AddPoint (pos + width * nnor);
+ int nEdge=dest->AddEdge (leftEnNo, leftStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ }
+}
+ void
+Path::DoRightJoin (Shape * dest, double width, JoinType join, Geom::Point pos,
+ Geom::Point prev, Geom::Point next, double miter, double /*prevL*/,
+ double /*nextL*/, int &rightStNo, int &rightEnNo,int pathID,int pieceID,double tID)
+{
+ const Geom::Point pnor=prev.ccw();
+ const Geom::Point nnor=next.ccw();
+ double angSi = cross(prev, next);
+ if (angSi > -0.0001 && angSi < 0.0001)
+ {
+ double angCo = dot (prev, next);
+ if (angCo > 0.9999)
+ {
+ // tout droit
+ rightEnNo = rightStNo = dest->AddPoint (pos - width*pnor);
+ }
+ else
+ {
+ // demi-tour
+ rightEnNo = dest->AddPoint (pos + width*pnor);
+ rightStNo = dest->AddPoint (pos - width*pnor);
+ int nEdge=dest->AddEdge (rightStNo, rightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ return;
+ }
+ if (angSi < 0)
+ {
+ if (join == join_pointy)
+ {
+ rightStNo = dest->AddPoint (pos - width*pnor);
+ rightEnNo = dest->AddPoint (pos - width*nnor);
+
+ const Geom::Point biss = StrokeNormalize (pnor + nnor);
+ double c2 = dot (biss, nnor);
+ double l = width / c2;
+ double emiter = width * c2;
+ if (emiter < miter)
+ emiter = miter;
+ if (l <= emiter)
+ {
+ int nrightStNo = dest->AddPoint (pos - l * biss);
+ int nEdge=dest->AddEdge (rightStNo, nrightStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (nrightStNo, rightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ else
+ {
+ double s2 = cross(nnor, biss);
+ double dec = (l - emiter) * c2 / s2;
+ const Geom::Point tbiss=biss.ccw();
+
+ int nrightStNo = dest->AddPoint (pos - emiter*biss - dec*tbiss);
+ int nrightEnNo = dest->AddPoint (pos - emiter*biss + dec*tbiss);
+ int nEdge=dest->AddEdge (rightStNo, nrightStNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (nrightStNo, nrightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ nEdge=dest->AddEdge (nrightEnNo, rightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ }
+ else if (join == join_round)
+ {
+ const Geom::Point sx = pos - width * pnor;
+ rightStNo = dest->AddPoint (sx);
+ const Geom::Point ex = pos - width * nnor;
+ rightEnNo = dest->AddPoint (ex);
+
+ RecRound(dest, rightStNo, rightEnNo,
+ sx, ex, -pnor, -nnor ,pos, width);
+ }
+ else
+ {
+ rightStNo = dest->AddPoint (pos - width * pnor);
+ rightEnNo = dest->AddPoint (pos - width * nnor);
+ int nEdge=dest->AddEdge (rightStNo, rightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+ }
+ }
+ else
+ {
+ /* Geom::Point biss;
+ biss=next.x-prev.x;
+ biss.y=next.y-prev.y;
+ double c2=cross(biss, next);
+ double l=width/c2;
+ double projn=l*(dot(biss,next));
+ double projp=-l*(dot(biss,prev));
+ if ( projp <= 0.5*prevL && projn <= 0.5*nextL ) {
+ double x,y;
+ x=pos.x+l*biss.x;
+ y=pos.y+l*biss.y;
+ rightEnNo=rightStNo=dest->AddPoint(x,y);
+ } else {*/
+ rightStNo = dest->AddPoint (pos - width*pnor);
+ rightEnNo = dest->AddPoint (pos - width*nnor);
+// int midNo = dest->AddPoint (pos);
+// int nEdge=dest->AddEdge (rightStNo, midNo);
+ int nEdge=dest->AddEdge (rightStNo, rightEnNo);
+ if ( dest->hasBackData() ) {
+ dest->ebData[nEdge].pathID=pathID;
+ dest->ebData[nEdge].pieceID=pieceID;
+ dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+ }
+// nEdge=dest->AddEdge (midNo, rightEnNo);
+// if ( dest->hasBackData() ) {
+// dest->ebData[nEdge].pathID=pathID;
+// dest->ebData[nEdge].pieceID=pieceID;
+// dest->ebData[nEdge].tSt=dest->ebData[nEdge].tEn=tID;
+// }
+ // }
+ }
+}
+
+
+// a very ugly way to produce round joins: doing one (or two, depend on the angle of the join) quadratic bezier curves
+// but since most joins are going to be small, nobody will notice -- but somebody noticed and now the ugly stuff is gone! so:
+
+// a very nice way to produce round joins, caps or dots
+void Path::RecRound(Shape *dest, int sNo, int eNo, // start and end index
+ Geom::Point const &iS, Geom::Point const &iE, // start and end point
+ Geom::Point const &nS, Geom::Point const &nE, // start and end normal vector
+ Geom::Point &origine, float width) // center and radius of round
+{
+ //Geom::Point diff = iS - iE;
+ //double dist = dot(diff, diff);
+ if (width < 0.5 || dot(iS - iE, iS - iE)/width < 2.0) {
+ dest->AddEdge(sNo, eNo);
+ return;
+ }
+ double ang, sia, lod;
+ if (nS == -nE) {
+ ang = M_PI;
+ sia = 1;
+ } else {
+ double coa = dot(nS, nE);
+ sia = cross(nE, nS);
+ ang = acos(coa);
+ if ( coa >= 1 ) {
+ ang = 0;
+ }
+ if ( coa <= -1 ) {
+ ang = M_PI;
+ }
+ }
+ lod = 0.02 + 10 / (10 + width); // limit detail to about 2 degrees (180 * 0.02/Pi degrees)
+ ang /= lod;
+
+ int nbS = (int) floor(ang);
+ Geom::Rotate omega(((sia > 0) ? -lod : lod));
+ Geom::Point cur = iS - origine;
+ // StrokeNormalize(cur);
+ // cur*=width;
+ int lastNo = sNo;
+ for (int i = 0; i < nbS; i++) {
+ cur = cur * omega;
+ Geom::Point m = origine + cur;
+ int mNo = dest->AddPoint(m);
+ dest->AddEdge(lastNo, mNo);
+ lastNo = mNo;
+ }
+ dest->AddEdge(lastNo, eNo);
+}
+
+/*
+ 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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