0a56a63417
or lines against lines. The constraints get rather screwed up afterwards, of course. So make arcs with the endpoints coincident into circles, instead of nothings; since the first split of a circle produces that. And don't warn after deleting just point-coincident or horiz/vert constraints as a dependency; that's just a nuisance, because it happens too often. [git-p4: depot-paths = "//depot/solvespace/": change = 1884]
410 lines
15 KiB
C++
410 lines
15 KiB
C++
#include "solvespace.h"
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//-----------------------------------------------------------------------------
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// Replace a point-coincident constraint on oldpt with that same constraint
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// on newpt. Useful when splitting or tangent arcing.
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//-----------------------------------------------------------------------------
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void GraphicsWindow::ReplacePointInConstraints(hEntity oldpt, hEntity newpt) {
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int i;
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for(i = 0; i < SS.constraint.n; i++) {
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Constraint *c = &(SS.constraint.elem[i]);
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if(c->type == Constraint::POINTS_COINCIDENT) {
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if(c->ptA.v == oldpt.v) c->ptA = newpt;
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if(c->ptB.v == oldpt.v) c->ptB = newpt;
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}
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}
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}
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//-----------------------------------------------------------------------------
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// A single point must be selected when this function is called. We find two
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// non-construction line segments that join at this point, and create a
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// tangent arc joining them.
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//-----------------------------------------------------------------------------
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void GraphicsWindow::MakeTangentArc(void) {
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if(!LockedInWorkplane()) {
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Error("Must be sketching in workplane to create tangent "
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"arc.");
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return;
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}
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// Find two line segments that join at the specified point,
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// and blend them with a tangent arc. First, find the
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// requests that generate the line segments.
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Vector pshared = SS.GetEntity(gs.point[0])->PointGetNum();
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ClearSelection();
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int i, c = 0;
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Entity *line[2];
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Request *lineReq[2];
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bool point1[2];
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for(i = 0; i < SS.request.n; i++) {
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Request *r = &(SS.request.elem[i]);
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if(r->group.v != activeGroup.v) continue;
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if(r->type != Request::LINE_SEGMENT) continue;
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if(r->construction) continue;
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Entity *e = SS.GetEntity(r->h.entity(0));
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Vector p0 = SS.GetEntity(e->point[0])->PointGetNum(),
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p1 = SS.GetEntity(e->point[1])->PointGetNum();
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if(p0.Equals(pshared) || p1.Equals(pshared)) {
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if(c < 2) {
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line[c] = e;
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lineReq[c] = r;
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point1[c] = (p1.Equals(pshared));
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}
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c++;
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}
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}
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if(c != 2) {
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Error("To create a tangent arc, select a point where "
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"two non-construction line segments join.");
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return;
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}
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SS.UndoRemember();
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Entity *wrkpl = SS.GetEntity(ActiveWorkplane());
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Vector wn = wrkpl->Normal()->NormalN();
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hEntity hshared = (line[0])->point[point1[0] ? 1 : 0],
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hother0 = (line[0])->point[point1[0] ? 0 : 1],
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hother1 = (line[1])->point[point1[1] ? 0 : 1];
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Vector pother0 = SS.GetEntity(hother0)->PointGetNum(),
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pother1 = SS.GetEntity(hother1)->PointGetNum();
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Vector v0shared = pshared.Minus(pother0),
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v1shared = pshared.Minus(pother1);
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hEntity srcline0 = (line[0])->h,
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srcline1 = (line[1])->h;
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(lineReq[0])->construction = true;
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(lineReq[1])->construction = true;
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// And thereafter we mustn't touch the entity or req ptrs,
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// because the new requests/entities we add might force a
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// realloc.
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memset(line, 0, sizeof(line));
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memset(lineReq, 0, sizeof(lineReq));
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// The sign of vv determines whether shortest distance is
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// clockwise or anti-clockwise.
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Vector v = (wn.Cross(v0shared)).WithMagnitude(1);
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double vv = v1shared.Dot(v);
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double dot = (v0shared.WithMagnitude(1)).Dot(
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v1shared.WithMagnitude(1));
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double theta = acos(dot);
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double r = 200/scale;
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// Set the radius so that no more than one third of the
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// line segment disappears.
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r = min(r, v0shared.Magnitude()*tan(theta/2)/3);
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r = min(r, v1shared.Magnitude()*tan(theta/2)/3);
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double el = r/tan(theta/2);
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hRequest rln0 = AddRequest(Request::LINE_SEGMENT, false),
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rln1 = AddRequest(Request::LINE_SEGMENT, false);
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hRequest rarc = AddRequest(Request::ARC_OF_CIRCLE, false);
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Entity *ln0 = SS.GetEntity(rln0.entity(0)),
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*ln1 = SS.GetEntity(rln1.entity(0));
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Entity *arc = SS.GetEntity(rarc.entity(0));
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SS.GetEntity(ln0->point[0])->PointForceTo(pother0);
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Constraint::ConstrainCoincident(ln0->point[0], hother0);
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SS.GetEntity(ln1->point[0])->PointForceTo(pother1);
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Constraint::ConstrainCoincident(ln1->point[0], hother1);
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Vector arc0 = pshared.Minus(v0shared.WithMagnitude(el));
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Vector arc1 = pshared.Minus(v1shared.WithMagnitude(el));
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SS.GetEntity(ln0->point[1])->PointForceTo(arc0);
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SS.GetEntity(ln1->point[1])->PointForceTo(arc1);
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Constraint::Constrain(Constraint::PT_ON_LINE,
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ln0->point[1], Entity::NO_ENTITY, srcline0);
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Constraint::Constrain(Constraint::PT_ON_LINE,
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ln1->point[1], Entity::NO_ENTITY, srcline1);
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Vector center = arc0;
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int a, b;
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if(vv < 0) {
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a = 1; b = 2;
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center = center.Minus(v0shared.Cross(wn).WithMagnitude(r));
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} else {
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a = 2; b = 1;
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center = center.Plus(v0shared.Cross(wn).WithMagnitude(r));
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}
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SS.GetEntity(arc->point[0])->PointForceTo(center);
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SS.GetEntity(arc->point[a])->PointForceTo(arc0);
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SS.GetEntity(arc->point[b])->PointForceTo(arc1);
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Constraint::ConstrainCoincident(arc->point[a], ln0->point[1]);
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Constraint::ConstrainCoincident(arc->point[b], ln1->point[1]);
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Constraint::Constrain(Constraint::ARC_LINE_TANGENT,
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Entity::NO_ENTITY, Entity::NO_ENTITY,
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arc->h, ln0->h, (a==2));
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Constraint::Constrain(Constraint::ARC_LINE_TANGENT,
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Entity::NO_ENTITY, Entity::NO_ENTITY,
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arc->h, ln1->h, (b==2));
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SS.later.generateAll = true;
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}
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void GraphicsWindow::SplitLine(hEntity he, Vector pinter) {
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// Save the original endpoints, since we're about to delete this entity.
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Entity *e01 = SS.GetEntity(he);
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hEntity hep0 = e01->point[0], hep1 = e01->point[1];
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Vector p0 = SS.GetEntity(hep0)->PointGetNum(),
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p1 = SS.GetEntity(hep1)->PointGetNum();
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SS.UndoRemember();
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// Add the two line segments this one gets split into.
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hRequest r0i = AddRequest(Request::LINE_SEGMENT, false),
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ri1 = AddRequest(Request::LINE_SEGMENT, false);
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// Don't get entities till after adding, realloc issues
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Entity *e0i = SS.GetEntity(r0i.entity(0)),
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*ei1 = SS.GetEntity(ri1.entity(0));
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SS.GetEntity(e0i->point[0])->PointForceTo(p0);
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SS.GetEntity(e0i->point[1])->PointForceTo(pinter);
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SS.GetEntity(ei1->point[0])->PointForceTo(pinter);
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SS.GetEntity(ei1->point[1])->PointForceTo(p1);
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ReplacePointInConstraints(hep0, e0i->point[0]);
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ReplacePointInConstraints(hep1, ei1->point[1]);
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// Finally, delete the original line
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int i;
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SS.request.ClearTags();
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for(i = 0; i < SS.request.n; i++) {
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Request *r = &(SS.request.elem[i]);
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if(r->group.v != activeGroup.v) continue;
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if(r->type != Request::LINE_SEGMENT) continue;
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// If the user wants to keep the old lines around, they can just
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// mark it construction first.
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if(he.v == r->h.entity(0).v && !r->construction) {
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r->tag = 1;
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break;
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}
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}
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DeleteTaggedRequests();
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}
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void GraphicsWindow::SplitCircle(hEntity he, Vector pinter) {
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SS.UndoRemember();
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Entity *circle = SS.GetEntity(he);
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if(circle->type == Entity::CIRCLE) {
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// Start with an unbroken circle, split it into a 360 degree arc.
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Vector center = SS.GetEntity(circle->point[0])->PointGetNum();
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circle = NULL; // shortly invalid!
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hRequest hr = AddRequest(Request::ARC_OF_CIRCLE, false);
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Entity *arc = SS.GetEntity(hr.entity(0));
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SS.GetEntity(arc->point[0])->PointForceTo(center);
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SS.GetEntity(arc->point[1])->PointForceTo(pinter);
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SS.GetEntity(arc->point[2])->PointForceTo(pinter);
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} else {
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// Start with an arc, break it in to two arcs
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Vector center = SS.GetEntity(circle->point[0])->PointGetNum(),
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start = SS.GetEntity(circle->point[1])->PointGetNum(),
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finish = SS.GetEntity(circle->point[2])->PointGetNum();
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circle = NULL; // shortly invalid!
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hRequest hr0 = AddRequest(Request::ARC_OF_CIRCLE, false),
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hr1 = AddRequest(Request::ARC_OF_CIRCLE, false);
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Entity *arc0 = SS.GetEntity(hr0.entity(0)),
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*arc1 = SS.GetEntity(hr1.entity(0));
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SS.GetEntity(arc0->point[0])->PointForceTo(center);
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SS.GetEntity(arc0->point[1])->PointForceTo(start);
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SS.GetEntity(arc0->point[2])->PointForceTo(pinter);
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SS.GetEntity(arc1->point[0])->PointForceTo(center);
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SS.GetEntity(arc1->point[1])->PointForceTo(pinter);
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SS.GetEntity(arc1->point[2])->PointForceTo(finish);
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}
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// Finally, delete the original circle or arc
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int i;
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SS.request.ClearTags();
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for(i = 0; i < SS.request.n; i++) {
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Request *r = &(SS.request.elem[i]);
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if(r->group.v != activeGroup.v) continue;
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if(r->type != Request::CIRCLE && r->type != Request::ARC_OF_CIRCLE) {
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continue;
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}
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// If the user wants to keep the old lines around, they can just
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// mark it construction first.
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if(he.v == r->h.entity(0).v && !r->construction) {
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r->tag = 1;
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break;
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}
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}
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DeleteTaggedRequests();
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}
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void GraphicsWindow::SplitLinesOrCurves(void) {
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if(!LockedInWorkplane()) {
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Error("Must be sketching in workplane to split.");
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return;
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}
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GroupSelection();
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if(gs.n == 2 && gs.lineSegments == 2) {
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Entity *la = SS.GetEntity(gs.entity[0]),
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*lb = SS.GetEntity(gs.entity[1]);
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Vector a0 = SS.GetEntity(la->point[0])->PointGetNum(),
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a1 = SS.GetEntity(la->point[1])->PointGetNum(),
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b0 = SS.GetEntity(lb->point[0])->PointGetNum(),
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b1 = SS.GetEntity(lb->point[1])->PointGetNum();
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Vector da = a1.Minus(a0), db = b1.Minus(b0);
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// First, check if the lines intersect.
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bool skew;
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Vector pinter = Vector::AtIntersectionOfLines(a0, a1, b0, b1, &skew);
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if(skew) {
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Error("Lines are parallel or skew; no intersection to split.");
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goto done;
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}
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double ta = (pinter.Minus(a0)).DivPivoting(da),
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tb = (pinter.Minus(b0)).DivPivoting(db);
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double tola = LENGTH_EPS/da.Magnitude(),
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tolb = LENGTH_EPS/db.Magnitude();
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hEntity ha = la->h, hb = lb->h;
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la = NULL; lb = NULL;
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// Following adds will cause a realloc, break the pointers
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bool didSomething = false;
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if(ta > tola && ta < (1 - tola)) {
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SplitLine(ha, pinter);
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didSomething = true;
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}
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if(tb > tolb && tb < (1 - tolb)) {
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SplitLine(hb, pinter);
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didSomething = true;
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}
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if(!didSomething) {
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Error(
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"Nothing to split; intersection does not lie on either line.");
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}
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} else if(gs.n == 2 && gs.lineSegments == 1 && gs.circlesOrArcs == 1) {
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Entity *line = SS.GetEntity(gs.entity[0]),
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*circle = SS.GetEntity(gs.entity[1]);
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if(line->type != Entity::LINE_SEGMENT) {
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SWAP(Entity *, line, circle);
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}
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hEntity hline = line->h, hcircle = circle->h;
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Vector l0 = SS.GetEntity(line->point[0])->PointGetNum(),
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l1 = SS.GetEntity(line->point[1])->PointGetNum();
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Vector dl = l1.Minus(l0);
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Quaternion q = SS.GetEntity(circle->normal)->NormalGetNum();
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Vector cn = q.RotationN();
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Vector cc = SS.GetEntity(circle->point[0])->PointGetNum();
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double cd = cc.Dot(cn);
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double cr = circle->CircleGetRadiusNum();
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if(fabs(l0.Dot(cn) - cd) > LENGTH_EPS ||
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fabs(l1.Dot(cn) - cd) > LENGTH_EPS)
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{
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Error("Lines does not lie in same plane as circle.");
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goto done;
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}
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// Now let's see if they intersect; transform everything into a csys
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// with origin at the center of the circle, and where the line is
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// horizontal.
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Vector n = cn.WithMagnitude(1);
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Vector u = dl.WithMagnitude(1);
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Vector v = n.Cross(u);
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Vector nl0 = (l0.Minus(cc)).DotInToCsys(u, v, n),
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nl1 = (l1.Minus(cc)).DotInToCsys(u, v, n);
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double yint = nl0.y;
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if(fabs(yint) > (cr - LENGTH_EPS)) {
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Error("Line does not intersect (or is tangent to) circle.");
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goto done;
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}
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double xint = sqrt(cr*cr - yint*yint);
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Vector inter0 = Vector::From( xint, yint, 0),
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inter1 = Vector::From(-xint, yint, 0);
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// While we're here, let's calculate the angles at which the
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// intersections (and the endpoints of the arc) occur.
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double theta0 = atan2(yint, xint), theta1 = atan2(yint, -xint);
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double thetamin, thetamax;
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if(circle->type == Entity::CIRCLE) {
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thetamin = 0;
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thetamax = 2.1*PI; // fudge, make sure it's a good complete circle
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} else {
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Vector start = SS.GetEntity(circle->point[1])->PointGetNum(),
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finish = SS.GetEntity(circle->point[2])->PointGetNum();
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start = (start .Minus(cc)).DotInToCsys(u, v, n);
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finish = (finish.Minus(cc)).DotInToCsys(u, v, n);
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thetamin = atan2(start.y, start.x);
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thetamax = atan2(finish.y, finish.x);
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// Normalize; arc is drawn with increasing theta from start,
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// so subtract that off and make all angles in (0, 2*pi]
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theta0 = WRAP_NOT_0(theta0 - thetamin, 2*PI);
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theta1 = WRAP_NOT_0(theta1 - thetamin, 2*PI);
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thetamax = WRAP_NOT_0(thetamax - thetamin, 2*PI);
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}
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// And move our intersections back out to the base frame.
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inter0 = inter0.ScaleOutOfCsys(u, v, n).Plus(cc);
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inter1 = inter1.ScaleOutOfCsys(u, v, n).Plus(cc);
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// So now we have our intersection points. Let's see where they are
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// on the line.
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double t0 = (inter0.Minus(l0)).DivPivoting(dl),
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t1 = (inter1.Minus(l0)).DivPivoting(dl);
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double tol = LENGTH_EPS/dl.Magnitude();
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bool didSomething = false;
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// Split only once, even if it crosses multiple times; just pick
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// arbitrarily which.
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if(t0 > tol && t0 < (1 - tol) && theta0 < thetamax) {
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SplitLine(hline, inter0);
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SplitCircle(hcircle, inter0);
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didSomething = true;
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} else if(t1 > tol && t1 < (1 - tol) && theta1 < thetamax) {
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SplitLine(hline, inter1);
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SplitCircle(hcircle, inter1);
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didSomething = true;
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}
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if(!didSomething) {
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Error("Nothing to split; neither intersection lies on both the "
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"line and the circle.");
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}
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} else {
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Error("Can't split these entities; select two lines, a line and "
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"a circle, or a line and an arc.");
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}
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done:
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ClearSelection();
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SS.later.generateAll = true;
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}
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