Include custom styled entities in the same plane when exporting section.

CHANGELOG.md

@@ -46,6 +46,8 @@ New export/import features:
     exported. This format allows to easily hack on triangle mesh data created
     in SolveSpace, supports colour information and is more space efficient than
     most other formats.
+  * Export 2d section: custom styled entities that lie in the same 
+    plane as the exported section are included.
 
 New rendering features:
   * The "Show/hide hidden lines" button is now a tri-state button that allows

src/entity.cpp

@@ -784,6 +784,47 @@ Vector EntityBase::EndpointFinish() const {
         return SK.GetEntity(point[2])->PointGetNum();
     } else ssassert(false, "Unexpected entity type");
 }
+static bool PointInPlane(hEntity h, Vector norm, double distance) {
+    Vector p = SK.GetEntity(h)->PointGetNum();
+    return (fabs(norm.Dot(p) - distance) < LENGTH_EPS);
+}
+bool EntityBase::IsInPlane(Vector norm, double distance) const {
+    switch(type) {
+        case Type::LINE_SEGMENT: {
+            return PointInPlane(point[0], norm, distance)
+                && PointInPlane(point[1], norm, distance);
+        }
+        case Type::CUBIC:
+        case Type::CUBIC_PERIODIC: {
+            bool periodic = type == Type::CUBIC_PERIODIC;
+            int n = periodic ? 3 + extraPoints : extraPoints;
+            int i;
+            for (i=0; i<n; i++) {
+                if (!PointInPlane(point[i], norm, distance)) return false;
+            }
+            return true;
+        }
+
+        case Type::CIRCLE:
+        case Type::ARC_OF_CIRCLE: {
+            // If it is an (arc of) a circle, check whether the normals 
+            // are parallel and the mid point is in the plane.
+            Vector n = Normal()->NormalN();
+            if (!norm.Equals(n) && !norm.Equals(n.Negated())) return false;
+            return PointInPlane(point[0], norm, distance);
+        }
+
+        case Type::TTF_TEXT: {
+            Vector n = Normal()->NormalN();
+            if (!norm.Equals(n) && !norm.Equals(n.Negated())) return false;
+            return PointInPlane(point[0], norm, distance)
+                && PointInPlane(point[1], norm, distance);
+        }
+
+        default:
+            return false;
+    }
+}
 
 void EntityBase::RectGetPointsExprs(ExprVector *eb, ExprVector *ec) const {
     ssassert(type == Type::TTF_TEXT || type == Type::IMAGE,

src/export.cpp

@@ -78,9 +78,8 @@ void SolveSpaceUI::ExportSectionTo(const Platform::Path &filename) {
     g->runningMesh.MakeEdgesInPlaneInto(&el, n, d);
 
     // If there's a shell, then grab the edges and possibly Beziers.
-    g->runningShell.MakeSectionEdgesInto(n, d,
+    bool export_as_pwl = SS.exportPwlCurves || fabs(SS.exportOffset) > LENGTH_EPS;
-       &el,
+    g->runningShell.MakeSectionEdgesInto(n, d, &el, export_as_pwl ? NULL : &bl);
-       (SS.exportPwlCurves || fabs(SS.exportOffset) > LENGTH_EPS) ? NULL : &bl);
 
     // All of these are solid model edges, so use the appropriate style.
     SEdge *se;
@@ -92,8 +91,28 @@ void SolveSpaceUI::ExportSectionTo(const Platform::Path &filename) {
         sb->auxA = Style::SOLID_EDGE;
     }
 
-    el.CullExtraneousEdges();
+    // Remove all overlapping edges/beziers to merge the areas they describe.
-    bl.CullIdenticalBeziers();
+    el.CullExtraneousEdges(/*both=*/true);
+    bl.CullIdenticalBeziers(/*both=*/true);
+    
+    // Collect lines and beziers with custom style & export.
+    int i;
+    for(i = 0; i < SK.entity.n; i++) {
+        Entity *e = &(SK.entity.elem[i]);
+        if (!e->IsVisible()) continue;
+        if (e->style.v < Style::FIRST_CUSTOM) continue;
+        if (!Style::Exportable(e->style.v)) continue;
+        if (!e->IsInPlane(n,d)) continue;
+        if (export_as_pwl) {
+            e->GenerateEdges(&el);
+        } else {
+            e->GenerateBezierCurves(&bl);
+        }
+    }
+
+    // Only remove half of the overlapping edges/beziers to support TTF Stick Fonts.
+    el.CullExtraneousEdges(/*both=*/false);
+    bl.CullIdenticalBeziers(/*both=*/false);
 
     // And write the edges.
     VectorFileWriter *out = VectorFileWriter::ForFile(filename);
@@ -573,7 +592,7 @@ void SolveSpaceUI::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *s
     // If possible, then we will assemble these output curves into loops. They
     // will then get exported as closed paths.
     SBezierLoopSetSet sblss = {};
-    SBezierList leftovers = {};
+    SBezierLoopSet leftovers = {};
     SSurface srf = SSurface::FromPlane(Vector::From(0, 0, 0),
                                        Vector::From(1, 0, 0),
                                        Vector::From(0, 1, 0));
@@ -586,14 +605,11 @@ void SolveSpaceUI::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *s
                              &allClosed, &notClosedAt,
                              NULL, NULL,
                              &leftovers);
-    for(b = leftovers.l.First(); b; b = leftovers.l.NextAfter(b)) {
+    sblss.l.Add(&leftovers);
-        sblss.AddOpenPath(b);
-    }
 
     // Now write the lines and triangles to the output file
     out->OutputLinesAndMesh(&sblss, &sms);
 
-    leftovers.Clear();
     spxyz.Clear();
     sblss.Clear();
     smp.Clear();

src/polygon.cpp

@@ -327,10 +327,13 @@ bool SEdgeList::ContainsEdge(const SEdge *set) const {
 }
 
 //-----------------------------------------------------------------------------
-// Remove unnecessary edges: if two are anti-parallel then remove both, and if
+// Remove unnecessary edges:
-// two are parallel then remove one.
+// - if two are anti-parallel then
+//     if both=true, remove both
+//     else remove only one.
+// - if two are parallel then remove one.
 //-----------------------------------------------------------------------------
-void SEdgeList::CullExtraneousEdges() {
+void SEdgeList::CullExtraneousEdges(bool both) {
     l.ClearTags();
     int i, j;
     for(i = 0; i < l.n; i++) {
@@ -342,8 +345,9 @@ void SEdgeList::CullExtraneousEdges() {
                 set->tag = 1;
             }
             if((set->a).Equals(se->b) && (set->b).Equals(se->a)) {
-                // Two anti-parallel edges exist; so keep neither.
+                // Two anti-parallel edges exist; if both=true, keep neither,
-                se->tag = 1;
+                // otherwise keep only one.
+                if (both) se->tag = 1;
                 set->tag = 1;
             }
         }

src/polygon.h

@@ -58,7 +58,7 @@ public:
         Vector *pi=NULL, SPointList *spl=NULL) const;
     bool ContainsEdgeFrom(const SEdgeList *sel) const;
     bool ContainsEdge(const SEdge *se) const;
-    void CullExtraneousEdges();
+    void CullExtraneousEdges(bool both=true);
     void MergeCollinearSegments(Vector a, Vector b);
 };
 

src/sketch.h

@@ -185,7 +185,7 @@ public:
 
     SPolygon                polyLoops;
     SBezierLoopSetSet       bezierLoops;
-    SBezierList             bezierOpens;
+    SBezierLoopSet          bezierOpens;
 
     struct {
         PolyError       how;
@@ -483,6 +483,7 @@ public:
     bool HasEndpoints() const;
     Vector EndpointStart() const;
     Vector EndpointFinish() const;
+    bool IsInPlane(Vector norm, double distance) const;
 
     void RectGetPointsExprs(ExprVector *eap, ExprVector *ebp) const;
 

src/srf/curve.cpp

@@ -231,9 +231,10 @@ void SBezierList::ScaleSelfBy(double s) {
 
 //-----------------------------------------------------------------------------
 // If our list contains multiple identical Beziers (in either forward or
-// reverse order), then cull them.
+// reverse order), then cull them. If both is true, both beziers are removed.
+// Otherwise only one of them is removed.
 //-----------------------------------------------------------------------------
-void SBezierList::CullIdenticalBeziers() {
+void SBezierList::CullIdenticalBeziers(bool both) {
     int i, j;
 
     l.ClearTags();
@@ -247,7 +248,7 @@ void SBezierList::CullIdenticalBeziers() {
             if(bj->Equals(bi) ||
                bj->Equals(&bir))
             {
-                bi->tag = 1;
+                if (both) bi->tag = 1;
                 bj->tag = 1;
             }
         }
@@ -491,7 +492,7 @@ bool SBezierLoop::IsClosed() const {
 SBezierLoopSet SBezierLoopSet::From(SBezierList *sbl, SPolygon *poly,
                                     double chordTol,
                                     bool *allClosed, SEdge *errorAt,
-                                    SBezierList *openContours)
+                                    SBezierLoopSet *openContours)
 {
     SBezierLoopSet ret = {};
 
@@ -504,12 +505,10 @@ SBezierLoopSet SBezierLoopSet::From(SBezierList *sbl, SPolygon *poly,
             // Record open loops in a separate list, if requested.
             *allClosed = false;
             if(openContours) {
-                SBezier *sb;
+                openContours->l.Add(&loop);
-                for(sb = loop.l.First(); sb; sb = loop.l.NextAfter(sb)) {
+            } else {
-                    openContours->l.Add(sb);
-                }
-            }
                 loop.Clear();
+            }
         } else {
             ret.l.Add(&loop);
             poly->AddEmptyContour();
@@ -576,7 +575,7 @@ void SBezierLoopSetSet::FindOuterFacesFrom(SBezierList *sbl, SPolygon *spxyz,
                                    double chordTol,
                                    bool *allClosed, SEdge *notClosedAt,
                                    bool *allCoplanar, Vector *notCoplanarAt,
-                                   SBezierList *openContours)
+                                   SBezierLoopSet *openContours)
 {
     SSurface srfPlane;
     if(!srfuv) {
@@ -589,7 +588,9 @@ void SBezierLoopSetSet::FindOuterFacesFrom(SBezierList *sbl, SPolygon *spxyz,
             if(openContours) {
                 SBezier *sb;
                 for(sb = sbl->l.First(); sb; sb = sbl->l.NextAfter(sb)) {
-                    openContours->l.Add(sb);
+                    SBezierLoop sbl={};
+                    sbl.l.Add(sb);
+                    openContours->l.Add(&sbl);
                 }
             }
             return;
@@ -705,12 +706,10 @@ void SBezierLoopSetSet::FindOuterFacesFrom(SBezierList *sbl, SPolygon *spxyz,
         if(loop->tag == USED_LOOP) continue;
 
         if(openContours) {
-            SBezier *sb;
+            openContours->l.Add(loop);
-            for(sb = loop->l.First(); sb; sb = loop->l.NextAfter(sb)) {
+        } else {
-                openContours->l.Add(sb);
-            }
-        }
             loop->Clear();
+        }
         // but don't free the used loops, since we shallow-copied them to
         // ourself
     }

src/srf/surface.h

@@ -125,7 +125,7 @@ public:
 
     void Clear();
     void ScaleSelfBy(double s);
-    void CullIdenticalBeziers();
+    void CullIdenticalBeziers(bool both=true);
     void AllIntersectionsWith(SBezierList *sblb, SPointList *spl) const;
     bool GetPlaneContainingBeziers(Vector *p, Vector *u, Vector *v,
                                         Vector *notCoplanarAt) const;
@@ -156,7 +156,7 @@ public:
     static SBezierLoopSet From(SBezierList *spcl, SPolygon *poly,
                                double chordTol,
                                bool *allClosed, SEdge *errorAt,
-                               SBezierList *openContours);
+                               SBezierLoopSet *openContours);
 
     void GetBoundingProjd(Vector u, Vector orig, double *umin, double *umax) const;
     double SignedArea();
@@ -172,7 +172,7 @@ public:
                             double chordTol,
                             bool *allClosed, SEdge *notClosedAt,
                             bool *allCoplanar, Vector *notCoplanarAt,
-                            SBezierList *openContours);
+                            SBezierLoopSet *openContours);
     void AddOpenPath(SBezier *sb);
     void Clear();
 };