void Constraint::LineDrawOrGetDistance(Vector a, Vector b) {
if(dogd.drawing) {
// Draw comments in the specified style, but everything else in the
// default style for constraints.
hStyle hs;
if(type == COMMENT && disp.style.v) {
hs = disp.style;
} else {
hs.v = Style::CONSTRAINT;
}
if(dogd.sel) {
dogd.sel->AddEdge(a, b, hs.v);
} else {
// The only constraints with styles should be comments, so don't
// check otherwise, save looking up the styles constantly.
if(type == COMMENT && Style::Width(hs) >= 3.0) {
ssglFatLine(a, b, Style::Width(hs) / SS.GW.scale);
} else {
glBegin(GL_LINE_STRIP);
ssglVertex3v(a);
ssglVertex3v(b);
glEnd();
}
}
} else {
Point2d ap = SS.GW.ProjectPoint(a);
Point2d bp = SS.GW.ProjectPoint(b);
double d = dogd.mp.DistanceToLine(ap, bp.Minus(ap), true);
dogd.dmin = min(dogd.dmin, d);
}
dogd.refp = (a.Plus(b)).ScaledBy(0.5);
}
void Entity::LineDrawOrGetDistance(Vector a, Vector b, bool maybeFat) {
if(dogd.drawing) {
// Draw lines from active group in front of those from previous
ssglDepthRangeOffset((group.v == SS.GW.activeGroup.v) ? 4 : 3);
// Narrow lines are drawn as lines, but fat lines must be drawn as
// filled polygons, to get the line join style right.
if(!maybeFat || dogd.lineWidth < 3) {
glBegin(GL_LINES);
ssglVertex3v(a);
ssglVertex3v(b);
glEnd();
} else {
ssglFatLine(a, b, dogd.lineWidth/SS.GW.scale);
}
ssglDepthRangeOffset(0);
} else {
Point2d ap = SS.GW.ProjectPoint(a);
Point2d bp = SS.GW.ProjectPoint(b);
double d = dogd.mp.DistanceToLine(ap, bp.Minus(ap), true);
// A little bit easier to select in the active group
if(group.v == SS.GW.activeGroup.v) d -= 1;
dogd.dmin = min(dogd.dmin, d);
}
dogd.refp = (a.Plus(b)).ScaledBy(0.5);
}
void Constraint::DoLabel(Vector ref, Vector *labelPos, Vector gr, Vector gu) {
double th;
if(type == COMMENT) {
th = Style::TextHeight(disp.style);
} else {
th = DEFAULT_TEXT_HEIGHT;
}
char *s = Label();
double swidth = ssglStrWidth(s, th),
sheight = ssglStrHeight(th);
// By default, the reference is from the center; but the style could
// specify otherwise if one is present, and it could also specify a
// rotation.
if(type == COMMENT && disp.style.v) {
Style *st = Style::Get(disp.style);
// rotation first
double rads = st->textAngle*PI/180;
double c = cos(rads), s = sin(rads);
Vector pr = gr, pu = gu;
gr = pr.ScaledBy( c).Plus(pu.ScaledBy(s));
gu = pr.ScaledBy(-s).Plus(pu.ScaledBy(c));
// then origin
int o = st->textOrigin;
if(o & Style::ORIGIN_LEFT) ref = ref.Plus(gr.WithMagnitude(swidth/2));
if(o & Style::ORIGIN_RIGHT) ref = ref.Minus(gr.WithMagnitude(swidth/2));
if(o & Style::ORIGIN_BOT) ref = ref.Plus(gu.WithMagnitude(sheight/2));
if(o & Style::ORIGIN_TOP) ref = ref.Minus(gu.WithMagnitude(sheight/2));
}
if(labelPos) {
// labelPos is from the top left corner (for the text box used to
// edit things), but ref is from the center.
*labelPos = ref.Minus(gr.WithMagnitude(swidth/2)).Minus(
gu.WithMagnitude(sheight/2));
}
if(dogd.drawing) {
ssglWriteTextRefCenter(s, th, ref, gr, gu, LineCallback, this);
} else {
double l = swidth/2 - sheight/2;
l = max(l, 5/SS.GW.scale);
Point2d a = SS.GW.ProjectPoint(ref.Minus(gr.WithMagnitude(l)));
Point2d b = SS.GW.ProjectPoint(ref.Plus (gr.WithMagnitude(l)));
double d = dogd.mp.DistanceToLine(a, b.Minus(a), true);
dogd.dmin = min(dogd.dmin, d - (th / 2));
dogd.refp = ref;
}
}
void SSurface::EdgeNormalsWithinSurface(Point2d auv, Point2d buv,
Vector *pt,
Vector *enin, Vector *enout,
Vector *surfn,
uint32_t auxA,
SShell *shell, SShell *sha, SShell *shb)
{
// the midpoint of the edge
Point2d muv = (auv.Plus(buv)).ScaledBy(0.5);
*pt = PointAt(muv);
// If this edge just approximates a curve, then refine our midpoint so
// so that it actually lies on that curve too. Otherwise stuff like
// point-on-face tests will fail, since the point won't actually lie
// on the other face.
hSCurve hc = { auxA };
SCurve *sc = shell->curve.FindById(hc);
if(sc->isExact && sc->exact.deg != 1) {
double t;
sc->exact.ClosestPointTo(*pt, &t, false);
*pt = sc->exact.PointAt(t);
ClosestPointTo(*pt, &muv);
} else if(!sc->isExact) {
SSurface *trimmedA = sc->GetSurfaceA(sha, shb),
*trimmedB = sc->GetSurfaceB(sha, shb);
*pt = trimmedA->ClosestPointOnThisAndSurface(trimmedB, *pt);
ClosestPointTo(*pt, &muv);
}
*surfn = NormalAt(muv.x, muv.y);
// Compute the edge's inner normal in xyz space.
Vector ab = (PointAt(auv)).Minus(PointAt(buv)),
enxyz = (ab.Cross(*surfn)).WithMagnitude(SS.ChordTolMm());
// And based on that, compute the edge's inner normal in uv space. This
// vector is perpendicular to the edge in xyz, but not necessarily in uv.
Vector tu, tv;
TangentsAt(muv.x, muv.y, &tu, &tv);
Point2d enuv;
enuv.x = enxyz.Dot(tu) / tu.MagSquared();
enuv.y = enxyz.Dot(tv) / tv.MagSquared();
// Compute the inner and outer normals of this edge (within the srf),
// in xyz space. These are not necessarily antiparallel, if the
// surface is curved.
Vector pin = PointAt(muv.Minus(enuv)),
pout = PointAt(muv.Plus(enuv));
*enin = pin.Minus(*pt),
*enout = pout.Minus(*pt);
}
