C++ Entity::GenerateEdges方法代码示例

//-----------------------------------------------------------------------------
// Select everything that lies within the marquee view-aligned rectangle. For
// points, we test by the point location. For normals, we test by the normal's
// associated point. For anything else, we test by any piecewise linear edge.
//-----------------------------------------------------------------------------
void GraphicsWindow::SelectByMarquee(void) {
    Point2d begin = ProjectPoint(orig.marqueePoint);
    double xmin = min(orig.mouse.x, begin.x),
           xmax = max(orig.mouse.x, begin.x),
           ymin = min(orig.mouse.y, begin.y),
           ymax = max(orig.mouse.y, begin.y);

    Entity *e;
    for(e = SK.entity.First(); e; e = SK.entity.NextAfter(e)) {
        if(e->group.v != SS.GW.activeGroup.v) continue;
        if(e->IsFace() || e->IsDistance()) continue;
        if(!e->IsVisible()) continue;

        if(e->IsPoint() || e->IsNormal()) {
            Vector p = e->IsPoint() ? e->PointGetNum() :
                                      SK.GetEntity(e->point[0])->PointGetNum();
            Point2d pp = ProjectPoint(p);
            if(pp.x >= xmin && pp.x <= xmax &&
               pp.y >= ymin && pp.y <= ymax)
            {
                MakeSelected(e->h);
            }
        } else {
            // Use the 3d bounding box test routines, to avoid duplication;
            // so let our bounding square become a bounding box that certainly
            // includes the z = 0 plane.
            Vector ptMin = Vector::From(xmin, ymin, -1),
                   ptMax = Vector::From(xmax, ymax, 1);
            SEdgeList sel;
            ZERO(&sel);
            e->GenerateEdges(&sel, true);
            SEdge *se;
            for(se = sel.l.First(); se; se = sel.l.NextAfter(se)) {
                Point2d ppa = ProjectPoint(se->a),
                        ppb = ProjectPoint(se->b);
                Vector  ptA = Vector::From(ppa.x, ppa.y, 0),
                        ptB = Vector::From(ppb.x, ppb.y, 0);
                if(Vector::BoundingBoxIntersectsLine(ptMax, ptMin,
                                                     ptA, ptB, true) ||
                   !ptA.OutsideAndNotOn(ptMax, ptMin) ||
                   !ptB.OutsideAndNotOn(ptMax, ptMin))
                {
                    MakeSelected(e->h);
                    break;
                }
            }
            sel.Clear();
        }
    }
}

void SolveSpace::ExportViewOrWireframeTo(char *filename, bool wireframe) {
    int i;
    SEdgeList edges;
    ZERO(&edges);
    SBezierList beziers;
    ZERO(&beziers);

    SMesh *sm = NULL;
    if(SS.GW.showShaded) {
        Group *g = SK.GetGroup(SS.GW.activeGroup);
        g->GenerateDisplayItems();
        sm = &(g->displayMesh);
    }
    if(sm && sm->IsEmpty()) {
        sm = NULL;
    }

    for(i = 0; i < SK.entity.n; i++) {
        Entity *e = &(SK.entity.elem[i]);
        if(!e->IsVisible()) continue;
        if(e->construction) continue;

        if(SS.exportPwlCurves || (sm && !SS.GW.showHdnLines) ||
                                 fabs(SS.exportOffset) > LENGTH_EPS)
        {
            // We will be doing hidden line removal, which we can't do on
            // exact curves; so we need things broken down to pwls. Same
            // problem with cutter radius compensation.
            e->GenerateEdges(&edges);
        } else {
            e->GenerateBezierCurves(&beziers);
        }
    }

    if(SS.GW.showEdges) {
        Group *g = SK.GetGroup(SS.GW.activeGroup);
        g->GenerateDisplayItems();
        SEdgeList *selr = &(g->displayEdges);
        SEdge *se;
        for(se = selr->l.First(); se; se = selr->l.NextAfter(se)) {
            edges.AddEdge(se->a, se->b, Style::SOLID_EDGE);
        }
    }

    if(SS.GW.showConstraints) {
        Constraint *c;
        for(c = SK.constraint.First(); c; c = SK.constraint.NextAfter(c)) {
            c->GetEdges(&edges);
        }
    }

    if(wireframe) {
        VectorFileWriter *out = VectorFileWriter::ForFile(filename);
        if(out) {
            ExportWireframeCurves(&edges, &beziers, out);
        }
    } else {
        Vector u = SS.GW.projRight,
               v = SS.GW.projUp,
               n = u.Cross(v),
               origin = SS.GW.offset.ScaledBy(-1);

        VectorFileWriter *out = VectorFileWriter::ForFile(filename);
        if(out) {
            ExportLinesAndMesh(&edges, &beziers, sm,
                               u, v, n, origin, SS.CameraTangent()*SS.GW.scale,
                               out);
        }

        if(out && !out->HasCanvasSize()) {
            // These file formats don't have a canvas size, so they just
            // get exported in the raw coordinate system. So indicate what
            // that was on-screen.
            SS.justExportedInfo.draw = true;
            SS.justExportedInfo.pt = origin;
            SS.justExportedInfo.u = u;
            SS.justExportedInfo.v = v;
            InvalidateGraphics();
        }
    }

    edges.Clear();
    beziers.Clear();
}