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916 lines (806 loc) · 30.8 KB
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//-----------------------------------------------------------------------------
// The implementation of our entities in the symbolic algebra system, methods
// to return a symbolic representation of the entity (line by its endpoints,
// circle by center and radius, etc.).
//
// Copyright 2008-2013 Jonathan Westhues.
//-----------------------------------------------------------------------------
#include "solvespace.h"
const hEntity EntityBase::FREE_IN_3D = { 0 };
const hEntity EntityBase::NO_ENTITY = { 0 };
bool EntityBase::HasVector() const {
switch(type) {
case Type::LINE_SEGMENT:
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA:
return true;
default:
return false;
}
}
ExprVector EntityBase::VectorGetExprsInWorkplane(hEntity wrkpl) const {
switch(type) {
case Type::LINE_SEGMENT:
return (SK.GetEntity(point[0])->PointGetExprsInWorkplane(wrkpl)).Minus(
SK.GetEntity(point[1])->PointGetExprsInWorkplane(wrkpl));
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA: {
ExprVector ev = NormalExprsN();
if(wrkpl.v == EntityBase::FREE_IN_3D.v) {
return ev;
}
// Get the offset and basis vectors for this weird exotic csys.
EntityBase *w = SK.GetEntity(wrkpl);
ExprVector wu = w->Normal()->NormalExprsU();
ExprVector wv = w->Normal()->NormalExprsV();
// Get our coordinates in three-space, and project them into that
// coordinate system.
ExprVector result;
result.x = ev.Dot(wu);
result.y = ev.Dot(wv);
result.z = Expr::From(0.0);
return result;
}
default: ssassert(false, "Unexpected entity type");
}
}
ExprVector EntityBase::VectorGetExprs() const {
return VectorGetExprsInWorkplane(EntityBase::FREE_IN_3D);
}
Vector EntityBase::VectorGetNum() const {
switch(type) {
case Type::LINE_SEGMENT:
return (SK.GetEntity(point[0])->PointGetNum()).Minus(
SK.GetEntity(point[1])->PointGetNum());
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA:
return NormalN();
default: ssassert(false, "Unexpected entity type");
}
}
Vector EntityBase::VectorGetRefPoint() const {
switch(type) {
case Type::LINE_SEGMENT:
return ((SK.GetEntity(point[0])->PointGetNum()).Plus(
SK.GetEntity(point[1])->PointGetNum())).ScaledBy(0.5);
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA:
return SK.GetEntity(point[0])->PointGetNum();
default: ssassert(false, "Unexpected entity type");
}
}
Vector EntityBase::VectorGetStartPoint() const {
switch(type) {
case Type::LINE_SEGMENT:
return SK.GetEntity(point[1])->PointGetNum();
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA:
return SK.GetEntity(point[0])->PointGetNum();
default: ssassert(false, "Unexpected entity type");
}
}
bool EntityBase::IsCircle() const {
return (type == Type::CIRCLE) || (type == Type::ARC_OF_CIRCLE);
}
Expr *EntityBase::CircleGetRadiusExpr() const {
if(type == Type::CIRCLE) {
return SK.GetEntity(distance)->DistanceGetExpr();
} else if(type == Type::ARC_OF_CIRCLE) {
return Constraint::Distance(workplane, point[0], point[1]);
} else ssassert(false, "Unexpected entity type");
}
double EntityBase::CircleGetRadiusNum() const {
if(type == Type::CIRCLE) {
return SK.GetEntity(distance)->DistanceGetNum();
} else if(type == Type::ARC_OF_CIRCLE) {
Vector c = SK.GetEntity(point[0])->PointGetNum();
Vector pa = SK.GetEntity(point[1])->PointGetNum();
return (pa.Minus(c)).Magnitude();
} else ssassert(false, "Unexpected entity type");
}
void EntityBase::ArcGetAngles(double *thetaa, double *thetab, double *dtheta) const {
ssassert(type == Type::ARC_OF_CIRCLE, "Unexpected entity type");
Quaternion q = Normal()->NormalGetNum();
Vector u = q.RotationU(), v = q.RotationV();
Vector c = SK.GetEntity(point[0])->PointGetNum();
Vector pa = SK.GetEntity(point[1])->PointGetNum();
Vector pb = SK.GetEntity(point[2])->PointGetNum();
Point2d c2 = c.Project2d(u, v);
Point2d pa2 = (pa.Project2d(u, v)).Minus(c2);
Point2d pb2 = (pb.Project2d(u, v)).Minus(c2);
*thetaa = atan2(pa2.y, pa2.x);
*thetab = atan2(pb2.y, pb2.x);
*dtheta = *thetab - *thetaa;
// If the endpoints are coincident, call it a full arc, not a zero arc;
// useful concept to have when splitting
while(*dtheta < 1e-6) *dtheta += 2*PI;
while(*dtheta > (2*PI)) *dtheta -= 2*PI;
}
Vector EntityBase::CubicGetStartNum() const {
return SK.GetEntity(point[0])->PointGetNum();
}
Vector EntityBase::CubicGetFinishNum() const {
return SK.GetEntity(point[3+extraPoints])->PointGetNum();
}
ExprVector EntityBase::CubicGetStartTangentExprs() const {
ExprVector pon = SK.GetEntity(point[0])->PointGetExprs(),
poff = SK.GetEntity(point[1])->PointGetExprs();
return (pon.Minus(poff));
}
ExprVector EntityBase::CubicGetFinishTangentExprs() const {
ExprVector pon = SK.GetEntity(point[3+extraPoints])->PointGetExprs(),
poff = SK.GetEntity(point[2+extraPoints])->PointGetExprs();
return (pon.Minus(poff));
}
Vector EntityBase::CubicGetStartTangentNum() const {
Vector pon = SK.GetEntity(point[0])->PointGetNum(),
poff = SK.GetEntity(point[1])->PointGetNum();
return (pon.Minus(poff));
}
Vector EntityBase::CubicGetFinishTangentNum() const {
Vector pon = SK.GetEntity(point[3+extraPoints])->PointGetNum(),
poff = SK.GetEntity(point[2+extraPoints])->PointGetNum();
return (pon.Minus(poff));
}
bool EntityBase::IsWorkplane() const {
return (type == Type::WORKPLANE);
}
ExprVector EntityBase::WorkplaneGetOffsetExprs() const {
return SK.GetEntity(point[0])->PointGetExprs();
}
Vector EntityBase::WorkplaneGetOffset() const {
return SK.GetEntity(point[0])->PointGetNum();
}
void EntityBase::WorkplaneGetPlaneExprs(ExprVector *n, Expr **dn) const {
if(type == Type::WORKPLANE) {
*n = Normal()->NormalExprsN();
ExprVector p0 = SK.GetEntity(point[0])->PointGetExprs();
// The plane is n dot (p - p0) = 0, or
// n dot p - n dot p0 = 0
// so dn = n dot p0
*dn = p0.Dot(*n);
} else ssassert(false, "Unexpected entity type");
}
bool EntityBase::IsDistance() const {
return (type == Type::DISTANCE) ||
(type == Type::DISTANCE_N_COPY);
}
double EntityBase::DistanceGetNum() const {
if(type == Type::DISTANCE) {
return SK.GetParam(param[0])->val;
} else if(type == Type::DISTANCE_N_COPY) {
return numDistance;
} else ssassert(false, "Unexpected entity type");
}
Expr *EntityBase::DistanceGetExpr() const {
if(type == Type::DISTANCE) {
return Expr::From(param[0]);
} else if(type == Type::DISTANCE_N_COPY) {
return Expr::From(numDistance);
} else ssassert(false, "Unexpected entity type");
}
void EntityBase::DistanceForceTo(double v) {
if(type == Type::DISTANCE) {
(SK.GetParam(param[0]))->val = v;
} else if(type == Type::DISTANCE_N_COPY) {
// do nothing, it's locked
} else ssassert(false, "Unexpected entity type");
}
EntityBase *EntityBase::Normal() const {
return SK.GetEntity(normal);
}
bool EntityBase::IsPoint() const {
switch(type) {
case Type::POINT_IN_3D:
case Type::POINT_IN_2D:
case Type::POINT_N_COPY:
case Type::POINT_N_TRANS:
case Type::POINT_N_ROT_TRANS:
case Type::POINT_N_ROT_AA:
return true;
default:
return false;
}
}
bool EntityBase::IsNormal() const {
switch(type) {
case Type::NORMAL_IN_3D:
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
case Type::NORMAL_N_ROT:
case Type::NORMAL_N_ROT_AA:
return true;
default: return false;
}
}
Quaternion EntityBase::NormalGetNum() const {
Quaternion q;
switch(type) {
case Type::NORMAL_IN_3D:
q = Quaternion::From(param[0], param[1], param[2], param[3]);
break;
case Type::NORMAL_IN_2D: {
EntityBase *wrkpl = SK.GetEntity(workplane);
EntityBase *norm = SK.GetEntity(wrkpl->normal);
q = norm->NormalGetNum();
break;
}
case Type::NORMAL_N_COPY:
q = numNormal;
break;
case Type::NORMAL_N_ROT:
q = Quaternion::From(param[0], param[1], param[2], param[3]);
q = q.Times(numNormal);
break;
case Type::NORMAL_N_ROT_AA: {
q = GetAxisAngleQuaternion(0);
q = q.Times(numNormal);
break;
}
default: ssassert(false, "Unexpected entity type");
}
return q;
}
void EntityBase::NormalForceTo(Quaternion q) {
switch(type) {
case Type::NORMAL_IN_3D:
SK.GetParam(param[0])->val = q.w;
SK.GetParam(param[1])->val = q.vx;
SK.GetParam(param[2])->val = q.vy;
SK.GetParam(param[3])->val = q.vz;
break;
case Type::NORMAL_IN_2D:
case Type::NORMAL_N_COPY:
// There's absolutely nothing to do; these are locked.
break;
case Type::NORMAL_N_ROT: {
Quaternion qp = q.Times(numNormal.Inverse());
SK.GetParam(param[0])->val = qp.w;
SK.GetParam(param[1])->val = qp.vx;
SK.GetParam(param[2])->val = qp.vy;
SK.GetParam(param[3])->val = qp.vz;
break;
}
case Type::NORMAL_N_ROT_AA:
// Not sure if I'll bother implementing this one
break;
default: ssassert(false, "Unexpected entity type");
}
}
Vector EntityBase::NormalU() const {
return NormalGetNum().RotationU();
}
Vector EntityBase::NormalV() const {
return NormalGetNum().RotationV();
}
Vector EntityBase::NormalN() const {
return NormalGetNum().RotationN();
}
ExprVector EntityBase::NormalExprsU() const {
return NormalGetExprs().RotationU();
}
ExprVector EntityBase::NormalExprsV() const {
return NormalGetExprs().RotationV();
}
ExprVector EntityBase::NormalExprsN() const {
return NormalGetExprs().RotationN();
}
ExprQuaternion EntityBase::NormalGetExprs() const {
ExprQuaternion q;
switch(type) {
case Type::NORMAL_IN_3D:
q = ExprQuaternion::From(param[0], param[1], param[2], param[3]);
break;
case Type::NORMAL_IN_2D: {
EntityBase *wrkpl = SK.GetEntity(workplane);
EntityBase *norm = SK.GetEntity(wrkpl->normal);
q = norm->NormalGetExprs();
break;
}
case Type::NORMAL_N_COPY:
q = ExprQuaternion::From(numNormal);
break;
case Type::NORMAL_N_ROT: {
ExprQuaternion orig = ExprQuaternion::From(numNormal);
q = ExprQuaternion::From(param[0], param[1], param[2], param[3]);
q = q.Times(orig);
break;
}
case Type::NORMAL_N_ROT_AA: {
ExprQuaternion orig = ExprQuaternion::From(numNormal);
q = GetAxisAngleQuaternionExprs(0);
q = q.Times(orig);
break;
}
default: ssassert(false, "Unexpected entity type");
}
return q;
}
void EntityBase::PointForceParamTo(Vector p) {
switch(type) {
case Type::POINT_IN_3D:
SK.GetParam(param[0])->val = p.x;
SK.GetParam(param[1])->val = p.y;
SK.GetParam(param[2])->val = p.z;
break;
case Type::POINT_IN_2D:
SK.GetParam(param[0])->val = p.x;
SK.GetParam(param[1])->val = p.y;
break;
default: ssassert(false, "Unexpected entity type");
}
}
void EntityBase::PointForceTo(Vector p) {
switch(type) {
case Type::POINT_IN_3D:
SK.GetParam(param[0])->val = p.x;
SK.GetParam(param[1])->val = p.y;
SK.GetParam(param[2])->val = p.z;
break;
case Type::POINT_IN_2D: {
EntityBase *c = SK.GetEntity(workplane);
p = p.Minus(c->WorkplaneGetOffset());
SK.GetParam(param[0])->val = p.Dot(c->Normal()->NormalU());
SK.GetParam(param[1])->val = p.Dot(c->Normal()->NormalV());
break;
}
case Type::POINT_N_TRANS: {
if(timesApplied == 0) break;
Vector trans = (p.Minus(numPoint)).ScaledBy(1.0/timesApplied);
SK.GetParam(param[0])->val = trans.x;
SK.GetParam(param[1])->val = trans.y;
SK.GetParam(param[2])->val = trans.z;
break;
}
case Type::POINT_N_ROT_TRANS: {
// Force only the translation; leave the rotation unchanged. But
// remember that we're working with respect to the rotated
// point.
Vector trans = p.Minus(PointGetQuaternion().Rotate(numPoint));
SK.GetParam(param[0])->val = trans.x;
SK.GetParam(param[1])->val = trans.y;
SK.GetParam(param[2])->val = trans.z;
break;
}
case Type::POINT_N_ROT_AA: {
// Force only the angle; the axis and center of rotation stay
Vector offset = Vector::From(param[0], param[1], param[2]);
Vector normal = Vector::From(param[4], param[5], param[6]);
Vector u = normal.Normal(0), v = normal.Normal(1);
Vector po = p.Minus(offset), numo = numPoint.Minus(offset);
double thetap = atan2(v.Dot(po), u.Dot(po));
double thetan = atan2(v.Dot(numo), u.Dot(numo));
double thetaf = (thetap - thetan);
double thetai = (SK.GetParam(param[3])->val)*timesApplied*2;
double dtheta = thetaf - thetai;
// Take the smallest possible change in the actual step angle,
// in order to avoid jumps when you cross from +pi to -pi
while(dtheta < -PI) dtheta += 2*PI;
while(dtheta > PI) dtheta -= 2*PI;
SK.GetParam(param[3])->val = (thetai + dtheta)/(timesApplied*2);
break;
}
case Type::POINT_N_COPY:
// Nothing to do; it's a static copy
break;
default: ssassert(false, "Unexpected entity type");
}
}
Vector EntityBase::PointGetNum() const {
Vector p;
switch(type) {
case Type::POINT_IN_3D:
p = Vector::From(param[0], param[1], param[2]);
break;
case Type::POINT_IN_2D: {
EntityBase *c = SK.GetEntity(workplane);
Vector u = c->Normal()->NormalU();
Vector v = c->Normal()->NormalV();
p = u.ScaledBy(SK.GetParam(param[0])->val);
p = p.Plus(v.ScaledBy(SK.GetParam(param[1])->val));
p = p.Plus(c->WorkplaneGetOffset());
break;
}
case Type::POINT_N_TRANS: {
Vector trans = Vector::From(param[0], param[1], param[2]);
p = numPoint.Plus(trans.ScaledBy(timesApplied));
break;
}
case Type::POINT_N_ROT_TRANS: {
Vector offset = Vector::From(param[0], param[1], param[2]);
Quaternion q = PointGetQuaternion();
p = q.Rotate(numPoint);
p = p.Plus(offset);
break;
}
case Type::POINT_N_ROT_AA: {
Vector offset = Vector::From(param[0], param[1], param[2]);
Quaternion q = PointGetQuaternion();
p = numPoint.Minus(offset);
p = q.Rotate(p);
p = p.Plus(offset);
break;
}
case Type::POINT_N_COPY:
p = numPoint;
break;
default: ssassert(false, "Unexpected entity type");
}
return p;
}
ExprVector EntityBase::PointGetExprs() const {
ExprVector r;
switch(type) {
case Type::POINT_IN_3D:
r = ExprVector::From(param[0], param[1], param[2]);
break;
case Type::POINT_IN_2D: {
EntityBase *c = SK.GetEntity(workplane);
ExprVector u = c->Normal()->NormalExprsU();
ExprVector v = c->Normal()->NormalExprsV();
r = c->WorkplaneGetOffsetExprs();
r = r.Plus(u.ScaledBy(Expr::From(param[0])));
r = r.Plus(v.ScaledBy(Expr::From(param[1])));
break;
}
case Type::POINT_N_TRANS: {
ExprVector orig = ExprVector::From(numPoint);
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
r = orig.Plus(trans.ScaledBy(Expr::From(timesApplied)));
break;
}
case Type::POINT_N_ROT_TRANS: {
ExprVector orig = ExprVector::From(numPoint);
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
ExprQuaternion q =
ExprQuaternion::From(param[3], param[4], param[5], param[6]);
orig = q.Rotate(orig);
r = orig.Plus(trans);
break;
}
case Type::POINT_N_ROT_AA: {
ExprVector orig = ExprVector::From(numPoint);
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
ExprQuaternion q = GetAxisAngleQuaternionExprs(3);
orig = orig.Minus(trans);
orig = q.Rotate(orig);
r = orig.Plus(trans);
break;
}
case Type::POINT_N_COPY:
r = ExprVector::From(numPoint);
break;
default: ssassert(false, "Unexpected entity type");
}
return r;
}
void EntityBase::PointGetExprsInWorkplane(hEntity wrkpl, Expr **u, Expr **v) const {
if(type == Type::POINT_IN_2D && workplane.v == wrkpl.v) {
// They want our coordinates in the form that we've written them,
// very nice.
*u = Expr::From(param[0]);
*v = Expr::From(param[1]);
} else {
// Get the offset and basis vectors for this weird exotic csys.
EntityBase *w = SK.GetEntity(wrkpl);
ExprVector wp = w->WorkplaneGetOffsetExprs();
ExprVector wu = w->Normal()->NormalExprsU();
ExprVector wv = w->Normal()->NormalExprsV();
// Get our coordinates in three-space, and project them into that
// coordinate system.
ExprVector ev = PointGetExprs();
ev = ev.Minus(wp);
*u = ev.Dot(wu);
*v = ev.Dot(wv);
}
}
ExprVector EntityBase::PointGetExprsInWorkplane(hEntity wrkpl) const {
if(wrkpl.v == Entity::FREE_IN_3D.v) {
return PointGetExprs();
}
ExprVector r;
PointGetExprsInWorkplane(wrkpl, &r.x, &r.y);
r.z = Expr::From(0.0);
return r;
}
void EntityBase::PointForceQuaternionTo(Quaternion q) {
ssassert(type == Type::POINT_N_ROT_TRANS, "Unexpected entity type");
SK.GetParam(param[3])->val = q.w;
SK.GetParam(param[4])->val = q.vx;
SK.GetParam(param[5])->val = q.vy;
SK.GetParam(param[6])->val = q.vz;
}
Quaternion EntityBase::GetAxisAngleQuaternion(int param0) const {
Quaternion q;
double theta = timesApplied*SK.GetParam(param[param0+0])->val;
double s = sin(theta), c = cos(theta);
q.w = c;
q.vx = s*SK.GetParam(param[param0+1])->val;
q.vy = s*SK.GetParam(param[param0+2])->val;
q.vz = s*SK.GetParam(param[param0+3])->val;
return q;
}
ExprQuaternion EntityBase::GetAxisAngleQuaternionExprs(int param0) const {
ExprQuaternion q;
Expr *theta = Expr::From(timesApplied)->Times(
Expr::From(param[param0+0]));
Expr *c = theta->Cos(), *s = theta->Sin();
q.w = c;
q.vx = s->Times(Expr::From(param[param0+1]));
q.vy = s->Times(Expr::From(param[param0+2]));
q.vz = s->Times(Expr::From(param[param0+3]));
return q;
}
Quaternion EntityBase::PointGetQuaternion() const {
Quaternion q;
if(type == Type::POINT_N_ROT_AA) {
q = GetAxisAngleQuaternion(3);
} else if(type == Type::POINT_N_ROT_TRANS) {
q = Quaternion::From(param[3], param[4], param[5], param[6]);
} else ssassert(false, "Unexpected entity type");
return q;
}
bool EntityBase::IsFace() const {
switch(type) {
case Type::FACE_NORMAL_PT:
case Type::FACE_XPROD:
case Type::FACE_N_ROT_TRANS:
case Type::FACE_N_TRANS:
case Type::FACE_N_ROT_AA:
return true;
default:
return false;
}
}
ExprVector EntityBase::FaceGetNormalExprs() const {
ExprVector r;
if(type == Type::FACE_NORMAL_PT) {
Vector v = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
r = ExprVector::From(v.WithMagnitude(1));
} else if(type == Type::FACE_XPROD) {
ExprVector vc = ExprVector::From(param[0], param[1], param[2]);
ExprVector vn =
ExprVector::From(numNormal.vx, numNormal.vy, numNormal.vz);
r = vc.Cross(vn);
r = r.WithMagnitude(Expr::From(1.0));
} else if(type == Type::FACE_N_ROT_TRANS) {
// The numerical normal vector gets the rotation; the numerical
// normal has magnitude one, and the rotation doesn't change that,
// so there's no need to fix it up.
r = ExprVector::From(numNormal.vx, numNormal.vy, numNormal.vz);
ExprQuaternion q =
ExprQuaternion::From(param[3], param[4], param[5], param[6]);
r = q.Rotate(r);
} else if(type == Type::FACE_N_TRANS) {
r = ExprVector::From(numNormal.vx, numNormal.vy, numNormal.vz);
} else if(type == Type::FACE_N_ROT_AA) {
r = ExprVector::From(numNormal.vx, numNormal.vy, numNormal.vz);
ExprQuaternion q = GetAxisAngleQuaternionExprs(3);
r = q.Rotate(r);
} else ssassert(false, "Unexpected entity type");
return r;
}
Vector EntityBase::FaceGetNormalNum() const {
Vector r;
if(type == Type::FACE_NORMAL_PT) {
r = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
} else if(type == Type::FACE_XPROD) {
Vector vc = Vector::From(param[0], param[1], param[2]);
Vector vn = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
r = vc.Cross(vn);
} else if(type == Type::FACE_N_ROT_TRANS) {
// The numerical normal vector gets the rotation
r = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
Quaternion q = Quaternion::From(param[3], param[4], param[5], param[6]);
r = q.Rotate(r);
} else if(type == Type::FACE_N_TRANS) {
r = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
} else if(type == Type::FACE_N_ROT_AA) {
r = Vector::From(numNormal.vx, numNormal.vy, numNormal.vz);
Quaternion q = GetAxisAngleQuaternion(3);
r = q.Rotate(r);
} else ssassert(false, "Unexpected entity type");
return r.WithMagnitude(1);
}
ExprVector EntityBase::FaceGetPointExprs() const {
ExprVector r;
if(type == Type::FACE_NORMAL_PT) {
r = SK.GetEntity(point[0])->PointGetExprs();
} else if(type == Type::FACE_XPROD) {
r = ExprVector::From(numPoint);
} else if(type == Type::FACE_N_ROT_TRANS) {
// The numerical point gets the rotation and translation.
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
ExprQuaternion q =
ExprQuaternion::From(param[3], param[4], param[5], param[6]);
r = ExprVector::From(numPoint);
r = q.Rotate(r);
r = r.Plus(trans);
} else if(type == Type::FACE_N_TRANS) {
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
r = ExprVector::From(numPoint);
r = r.Plus(trans.ScaledBy(Expr::From(timesApplied)));
} else if(type == Type::FACE_N_ROT_AA) {
ExprVector trans = ExprVector::From(param[0], param[1], param[2]);
ExprQuaternion q = GetAxisAngleQuaternionExprs(3);
r = ExprVector::From(numPoint);
r = r.Minus(trans);
r = q.Rotate(r);
r = r.Plus(trans);
} else ssassert(false, "Unexpected entity type");
return r;
}
Vector EntityBase::FaceGetPointNum() const {
Vector r;
if(type == Type::FACE_NORMAL_PT) {
r = SK.GetEntity(point[0])->PointGetNum();
} else if(type == Type::FACE_XPROD) {
r = numPoint;
} else if(type == Type::FACE_N_ROT_TRANS) {
// The numerical point gets the rotation and translation.
Vector trans = Vector::From(param[0], param[1], param[2]);
Quaternion q = Quaternion::From(param[3], param[4], param[5], param[6]);
r = q.Rotate(numPoint);
r = r.Plus(trans);
} else if(type == Type::FACE_N_TRANS) {
Vector trans = Vector::From(param[0], param[1], param[2]);
r = numPoint.Plus(trans.ScaledBy(timesApplied));
} else if(type == Type::FACE_N_ROT_AA) {
Vector trans = Vector::From(param[0], param[1], param[2]);
Quaternion q = GetAxisAngleQuaternion(3);
r = numPoint.Minus(trans);
r = q.Rotate(r);
r = r.Plus(trans);
} else ssassert(false, "Unexpected entity type");
return r;
}
bool EntityBase::HasEndpoints() const {
return (type == Type::LINE_SEGMENT) ||
(type == Type::CUBIC) ||
(type == Type::ARC_OF_CIRCLE);
}
Vector EntityBase::EndpointStart() const {
if(type == Type::LINE_SEGMENT) {
return SK.GetEntity(point[0])->PointGetNum();
} else if(type == Type::CUBIC) {
return CubicGetStartNum();
} else if(type == Type::ARC_OF_CIRCLE) {
return SK.GetEntity(point[1])->PointGetNum();
} else ssassert(false, "Unexpected entity type");
}
Vector EntityBase::EndpointFinish() const {
if(type == Type::LINE_SEGMENT) {
return SK.GetEntity(point[1])->PointGetNum();
} else if(type == Type::CUBIC) {
return CubicGetFinishNum();
} else if(type == Type::ARC_OF_CIRCLE) {
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,
"Unexpected entity type");
EntityBase *a = SK.GetEntity(point[0]);
EntityBase *o = SK.GetEntity(point[1]);
// Write equations for each point in the current workplane.
// This reduces the complexity of resulting equations.
ExprVector ea = a->PointGetExprsInWorkplane(workplane);
ExprVector eo = o->PointGetExprsInWorkplane(workplane);
// Take perpendicular vector and scale it by aspect ratio.
ExprVector eu = ea.Minus(eo);
ExprVector ev = ExprVector::From(eu.y, eu.x->Negate(), eu.z).ScaledBy(Expr::From(aspectRatio));
*eb = eo.Plus(ev);
*ec = eo.Plus(eu).Plus(ev);
}
void EntityBase::AddEq(IdList<Equation,hEquation> *l, Expr *expr, int index) const {
Equation eq;
eq.e = expr;
eq.h = h.equation(index);
l->Add(&eq);
}
void EntityBase::GenerateEquations(IdList<Equation,hEquation> *l) const {
switch(type) {
case Type::NORMAL_IN_3D: {
ExprQuaternion q = NormalGetExprs();
AddEq(l, (q.Magnitude())->Minus(Expr::From(1)), 0);
break;
}
case Type::ARC_OF_CIRCLE: {
// If this is a copied entity, with its point already fixed
// with respect to each other, then we don't want to generate
// the distance constraint!
if(SK.GetEntity(point[0])->type != Type::POINT_IN_2D) break;
// If the two endpoints of the arc are constrained coincident
// (to make a complete circle), then our distance constraint
// would be redundant and therefore overconstrain things.
int i;
for(i = 0; i < SK.constraint.n; i++) {
ConstraintBase *c = &(SK.constraint.elem[i]);
if(c->group.v != group.v) continue;
if(c->type != Constraint::Type::POINTS_COINCIDENT) continue;
if((c->ptA.v == point[1].v && c->ptB.v == point[2].v) ||
(c->ptA.v == point[2].v && c->ptB.v == point[1].v))
{
break;
}
}
if(i < SK.constraint.n) break;
Expr *ra = Constraint::Distance(workplane, point[0], point[1]);
Expr *rb = Constraint::Distance(workplane, point[0], point[2]);
AddEq(l, ra->Minus(rb), 0);
break;
}
case Type::IMAGE:
case Type::TTF_TEXT: {
if(SK.GetEntity(point[0])->type != Type::POINT_IN_2D) break;
EntityBase *b = SK.GetEntity(point[2]);
EntityBase *c = SK.GetEntity(point[3]);
ExprVector eb = b->PointGetExprsInWorkplane(workplane);
ExprVector ec = c->PointGetExprsInWorkplane(workplane);
ExprVector ebp, ecp;
RectGetPointsExprs(&ebp, &ecp);
ExprVector beq = eb.Minus(ebp);
AddEq(l, beq.x, 0);
AddEq(l, beq.y, 1);
ExprVector ceq = ec.Minus(ecp);
AddEq(l, ceq.x, 2);
AddEq(l, ceq.y, 3);
break;
}
default: // Most entities do not generate equations.
break;
}
}
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