C++ Constraint::ModifyToSatisfy方法代码示例

void Constraint::MenuConstrain(int id) {
    Constraint c;
    ZERO(&c);
    c.group = SS.GW.activeGroup;
    c.workplane = SS.GW.ActiveWorkplane();

    SS.GW.GroupSelection();
#define gs (SS.GW.gs)

    switch(id) {
        case GraphicsWindow::MNU_DISTANCE_DIA: {
            if(gs.points == 2 && gs.n == 2) {
                c.type = PT_PT_DISTANCE;
                c.ptA = gs.point[0];
                c.ptB = gs.point[1];
            } else if(gs.lineSegments == 1 && gs.n == 1) {
                c.type = PT_PT_DISTANCE;
                Entity *e = SK.GetEntity(gs.entity[0]);
                c.ptA = e->point[0];
                c.ptB = e->point[1];
            } else if(gs.vectors == 1 && gs.points == 2 && gs.n == 3) {
                c.type = PROJ_PT_DISTANCE;
                c.ptA = gs.point[0];
                c.ptB = gs.point[1];
                c.entityA = gs.vector[0];
            } else if(gs.workplanes == 1 && gs.points == 1 && gs.n == 2) {
                c.type = PT_PLANE_DISTANCE;
                c.ptA = gs.point[0];
                c.entityA = gs.entity[0];
            } else if(gs.lineSegments == 1 && gs.points == 1 && gs.n == 2) {
                c.type = PT_LINE_DISTANCE;
                c.ptA = gs.point[0];
                c.entityA = gs.entity[0];
            } else if(gs.faces == 1 && gs.points == 1 && gs.n == 2) {
                c.type = PT_FACE_DISTANCE;
                c.ptA = gs.point[0];
                c.entityA = gs.face[0];
            } else if(gs.circlesOrArcs == 1 && gs.n == 1) {
                c.type = DIAMETER;
                c.entityA = gs.entity[0];
            } else {
                Error(
"Bad selection for distance / diameter constraint. This "
"constraint can apply to:\n\n"
"    * two points (distance between points)\n"
"    * a line segment (length)\n"
"    * two points and a line segment or normal (projected distance)\n"
"    * a workplane and a point (minimum distance)\n"
"    * a line segment and a point (minimum distance)\n"
"    * a plane face and a point (minimum distance)\n"
"    * a circle or an arc (diameter)\n");
                return;
            }
            if(c.type == PT_PT_DISTANCE || c.type == PROJ_PT_DISTANCE) {
                Vector n = SS.GW.projRight.Cross(SS.GW.projUp);
                Vector a = SK.GetEntity(c.ptA)->PointGetNum();
                Vector b = SK.GetEntity(c.ptB)->PointGetNum();
                c.disp.offset = n.Cross(a.Minus(b));
                c.disp.offset = (c.disp.offset).WithMagnitude(50/SS.GW.scale);
            } else {
                c.disp.offset = Vector::From(0, 0, 0);
            }

            c.valA = 0;
            c.ModifyToSatisfy();
            AddConstraint(&c);
            break;
        }

        case GraphicsWindow::MNU_ON_ENTITY:
            if(gs.points == 2 && gs.n == 2) {
                c.type = POINTS_COINCIDENT;
                c.ptA = gs.point[0];
                c.ptB = gs.point[1];
            } else if(gs.points == 1 && gs.workplanes == 1 && gs.n == 2) {
                c.type = PT_IN_PLANE;
                c.ptA = gs.point[0];
                c.entityA = gs.entity[0];
            } else if(gs.points == 1 && gs.lineSegments == 1 && gs.n == 2) {
                c.type = PT_ON_LINE;
                c.ptA = gs.point[0];
                c.entityA = gs.entity[0];
            } else if(gs.points == 1 && gs.circlesOrArcs == 1 && gs.n == 2) {
                c.type = PT_ON_CIRCLE;
                c.ptA = gs.point[0];
                c.entityA = gs.entity[0];
            } else if(gs.points == 1 && gs.faces == 1 && gs.n == 2) {
                c.type = PT_ON_FACE;
                c.ptA = gs.point[0];
                c.entityA = gs.face[0];
            } else {
                Error("Bad selection for on point / curve / plane constraint. "
                      "This constraint can apply to:\n\n"
                      "    * two points (points coincident)\n"
                      "    * a point and a workplane (point in plane)\n"
                      "    * a point and a line segment (point on line)\n"
                      "    * a point and a circle or arc (point on curve)\n"
                      "    * a point and a plane face (point on face)\n");
                return;
            }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        if(g->h.v == Group::HGROUP_REFERENCES.v) {
            ForceReferences();
            g->solved.how = SolveResult::OKAY;
            g->clean = true;
        } else {
            if(i >= first && i <= last) {
                // The group falls inside the range, so really solve it,
                // and then regenerate the mesh based on the solved stuff.
                if(genForBBox) {
                    SolveGroup(g->h, andFindFree);
                } else {
                    g->GenerateLoops();
                    g->GenerateShellAndMesh();
                    g->clean = true;
                }
            } else {
                // The group falls outside the range, so just assume that
                // it's good wherever we left it. The mesh is unchanged,
                // and the parameters must be marked as known.
                for(j = 0; j < SK.param.n; j++) {
                    Param *newp = &(SK.param.elem[j]);

                    Param *prevp = prev.FindByIdNoOops(newp->h);
                    if(prevp) newp->known = true;
                }
            }
        }
    }

    // And update any reference dimensions with their new values
    for(i = 0; i < SK.constraint.n; i++) {
        Constraint *c = &(SK.constraint.elem[i]);
        if(c->reference) {
            c->ModifyToSatisfy();
        }
    }

    // Make sure the point that we're tracing exists.
    if(traced.point.v && !SK.entity.FindByIdNoOops(traced.point)) {
        traced.point = Entity::NO_ENTITY;
    }
    // And if we're tracing a point, add its new value to the path
    if(traced.point.v) {
        Entity *pt = SK.GetEntity(traced.point);
        traced.path.AddPoint(pt->PointGetNum());
    }

    prev.Clear();
    InvalidateGraphics();

    // Remove nonexistent selection items, for same reason we waited till
    // the end to put up a dialog box.
    GW.ClearNonexistentSelectionItems();

    if(deleted.requests > 0 || deleted.constraints > 0 || deleted.groups > 0) {
        // All sorts of interesting things could have happened; for example,
        // the active group or active workplane could have been deleted. So
        // clear all that out.
        if(deleted.groups > 0) {
            SS.TW.ClearSuper();
        }
        ScheduleShowTW();
        GW.ClearSuper();

        // People get annoyed if I complain whenever they delete any request,
        // and I otherwise will, since those always come with pt-coincident