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solvespace/entity.cpp

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C++
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#include "solvespace.h"
char *Entity::DescriptionString(void) {
Request *r = SS.GetRequest(h.request());
return r->DescriptionString();
}
bool Entity::IsWorkplane(void) {
return (type == WORKPLANE);
}
ExprVector Entity::WorkplaneGetOffsetExprs(void) {
return SS.GetEntity(point[0])->PointGetExprs();
}
Vector Entity::WorkplaneGetOffset(void) {
return SS.GetEntity(point[0])->PointGetNum();
}
void Entity::WorkplaneGetPlaneExprs(ExprVector *n, Expr **dn) {
if(type == WORKPLANE) {
*n = Normal()->NormalExprsN();
ExprVector p0 = SS.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 {
oops();
}
}
double Entity::DistanceGetNum(void) {
if(type == DISTANCE) {
return SS.GetParam(param[0])->val;
} else if(type == DISTANCE_XFRMD) {
return numDistance;
} else oops();
}
Expr *Entity::DistanceGetExpr(void) {
if(type == DISTANCE) {
return Expr::FromParam(param[0]);
} else if(type == DISTANCE_XFRMD) {
return Expr::FromConstant(numDistance);
} else oops();
}
void Entity::DistanceForceTo(double v) {
if(type == DISTANCE) {
(SS.GetParam(param[0]))->val = v;
} else if(type == DISTANCE_XFRMD) {
// do nothing, it's locked
} else oops();
}
Entity *Entity::Normal(void) {
return SS.GetEntity(normal);
}
bool Entity::IsPoint(void) {
switch(type) {
case POINT_IN_3D:
case POINT_IN_2D:
case POINT_XFRMD: return true;
default: return false;
}
}
bool Entity::IsNormal(void) {
switch(type) {
case NORMAL_IN_3D:
case NORMAL_IN_2D:
case NORMAL_XFRMD: return true;
default: return false;
}
}
Quaternion Entity::NormalGetNum(void) {
Quaternion q;
switch(type) {
case NORMAL_IN_3D:
q.w = SS.GetParam(param[0])->val;
q.vx = SS.GetParam(param[1])->val;
q.vy = SS.GetParam(param[2])->val;
q.vz = SS.GetParam(param[3])->val;
break;
case NORMAL_IN_2D: {
Entity *wrkpl = SS.GetEntity(workplane);
Entity *norm = SS.GetEntity(wrkpl->normal);
q = norm->NormalGetNum();
break;
}
case NORMAL_XFRMD:
q = numNormal;
break;
default: oops();
}
return q;
}
void Entity::NormalForceTo(Quaternion q) {
switch(type) {
case NORMAL_IN_3D:
SS.GetParam(param[0])->val = q.w;
SS.GetParam(param[1])->val = q.vx;
SS.GetParam(param[2])->val = q.vy;
SS.GetParam(param[3])->val = q.vz;
break;
case NORMAL_IN_2D:
case NORMAL_XFRMD:
// There's absolutely nothing to do; these are locked.
break;
default: oops();
}
}
Vector Entity::NormalU(void) {
return NormalGetNum().RotationU();
}
Vector Entity::NormalV(void) {
return NormalGetNum().RotationV();
}
Vector Entity::NormalN(void) {
return NormalGetNum().RotationN();
}
ExprVector Entity::NormalExprsU(void) {
return NormalGetExprs().RotationU();
}
ExprVector Entity::NormalExprsV(void) {
return NormalGetExprs().RotationV();
}
ExprVector Entity::NormalExprsN(void) {
return NormalGetExprs().RotationN();
}
ExprQuaternion Entity::NormalGetExprs(void) {
ExprQuaternion q;
switch(type) {
case NORMAL_IN_3D:
q.w = Expr::FromParam(param[0]);
q.vx = Expr::FromParam(param[1]);
q.vy = Expr::FromParam(param[2]);
q.vz = Expr::FromParam(param[3]);
break;
case NORMAL_IN_2D: {
Entity *wrkpl = SS.GetEntity(workplane);
Entity *norm = SS.GetEntity(wrkpl->normal);
q = norm->NormalGetExprs();
break;
}
case NORMAL_XFRMD:
q.w = Expr::FromConstant(numNormal.w);
q.vx = Expr::FromConstant(numNormal.vx);
q.vy = Expr::FromConstant(numNormal.vy);
q.vz = Expr::FromConstant(numNormal.vz);
break;
default: oops();
}
return q;
}
bool Entity::PointIsFromReferences(void) {
return h.request().IsFromReferences();
}
void Entity::PointForceTo(Vector p) {
switch(type) {
case POINT_IN_3D:
SS.GetParam(param[0])->val = p.x;
SS.GetParam(param[1])->val = p.y;
SS.GetParam(param[2])->val = p.z;
break;
case POINT_IN_2D: {
Entity *c = SS.GetEntity(workplane);
p = p.Minus(c->WorkplaneGetOffset());
SS.GetParam(param[0])->val = p.Dot(c->Normal()->NormalU());
SS.GetParam(param[1])->val = p.Dot(c->Normal()->NormalV());
break;
}
case POINT_XFRMD: {
Vector trans = p.Minus(numPoint);
SS.GetParam(param[0])->val = trans.x;
SS.GetParam(param[1])->val = trans.y;
SS.GetParam(param[2])->val = trans.z;
break;
}
default: oops();
}
}
Vector Entity::PointGetNum(void) {
Vector p;
switch(type) {
case POINT_IN_3D:
p.x = SS.GetParam(param[0])->val;
p.y = SS.GetParam(param[1])->val;
p.z = SS.GetParam(param[2])->val;
break;
case POINT_IN_2D: {
Entity *c = SS.GetEntity(workplane);
Vector u = c->Normal()->NormalU();
Vector v = c->Normal()->NormalV();
p = u.ScaledBy(SS.GetParam(param[0])->val);
p = p.Plus(v.ScaledBy(SS.GetParam(param[1])->val));
p = p.Plus(c->WorkplaneGetOffset());
break;
}
case POINT_XFRMD: {
p = numPoint;
p.x += SS.GetParam(param[0])->val;
p.y += SS.GetParam(param[1])->val;
p.z += SS.GetParam(param[2])->val;
break;
}
default: oops();
}
return p;
}
ExprVector Entity::PointGetExprs(void) {
ExprVector r;
switch(type) {
case POINT_IN_3D:
r.x = Expr::FromParam(param[0]);
r.y = Expr::FromParam(param[1]);
r.z = Expr::FromParam(param[2]);
break;
case POINT_IN_2D: {
Entity *c = SS.GetEntity(workplane);
ExprVector u = c->Normal()->NormalExprsU();
ExprVector v = c->Normal()->NormalExprsV();
r = c->WorkplaneGetOffsetExprs();
r = r.Plus(u.ScaledBy(Expr::FromParam(param[0])));
r = r.Plus(v.ScaledBy(Expr::FromParam(param[1])));
break;
}
case POINT_XFRMD: {
ExprVector orig = {
Expr::FromConstant(numPoint.x),
Expr::FromConstant(numPoint.y),
Expr::FromConstant(numPoint.z) };
ExprVector trans;
trans.x = Expr::FromParam(param[0]);
trans.y = Expr::FromParam(param[1]);
trans.z = Expr::FromParam(param[2]);
r = orig.Plus(trans);
break;
}
default: oops();
}
return r;
}
void Entity::PointGetExprsInWorkplane(hEntity wrkpl, Expr **u, Expr **v) {
if(type == POINT_IN_2D && workplane.v == wrkpl.v) {
// They want our coordinates in the form that we've written them,
// very nice.
*u = Expr::FromParam(param[0]);
*v = Expr::FromParam(param[1]);
} else {
// Get the offset and basis vectors for this weird exotic csys.
Entity *w = SS.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);
}
}
void Entity::LineDrawOrGetDistance(Vector a, Vector b) {
if(dogd.drawing) {
// This fudge guarantees that the line will get drawn in front of
// anything else at the "same" depth in the z-buffer, so that it
// goes in front of the shaded stuff.
Vector n = SS.GW.projRight.Cross(SS.GW.projUp);
n = n.WithMagnitude(3/SS.GW.scale);
glBegin(GL_LINE_STRIP);
glxVertex3v(a.Plus(n));
glxVertex3v(b.Plus(n));
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);
}
}
void Entity::LineDrawOrGetDistanceOrEdge(Vector a, Vector b) {
LineDrawOrGetDistance(a, b);
if(dogd.edges && !construction) {
SEdge edge;
edge.a = a; edge.b = b;
dogd.edges->l.Add(&edge);
}
}
void Entity::Draw(int order) {
dogd.drawing = true;
dogd.edges = NULL;
DrawOrGetDistance(order);
}
void Entity::GenerateEdges(SEdgeList *el) {
dogd.drawing = false;
dogd.edges = el;
DrawOrGetDistance(-1);
dogd.edges = NULL;
}
double Entity::GetDistance(Point2d mp) {
dogd.drawing = false;
dogd.edges = NULL;
dogd.mp = mp;
dogd.dmin = 1e12;
DrawOrGetDistance(-1);
return dogd.dmin;
}
void Entity::DrawOrGetDistance(int order) {
Group *g = SS.GetGroup(group);
// If an entity is invisible, then it doesn't get shown, and it doesn't
// contribute a distance for the selection, but it still generates edges.
if(!(g->visible) && !dogd.edges) return;
if(group.v != SS.GW.activeGroup.v) {
glxColor3d(0.5, 0.3, 0.0);
} else if(construction) {
glxColor3d(0.1, 0.7, 0.1);
} else {
glxColor3d(1, 1, 1);
}
switch(type) {
case POINT_XFRMD:
case POINT_IN_3D:
case POINT_IN_2D: {
if(order >= 0 && order != 2) break;
if(!SS.GW.showPoints) break;
if(h.isFromRequest()) {
Entity *isfor = SS.GetEntity(h.request().entity(0));
if(!SS.GW.showWorkplanes && isfor->type == Entity::WORKPLANE) {
break;
}
}
Vector v = PointGetNum();
if(dogd.drawing) {
double s = 3;
Vector r = SS.GW.projRight.ScaledBy(s/SS.GW.scale);
Vector d = SS.GW.projUp.ScaledBy(s/SS.GW.scale);
// The usual fudge, to make this appear in front.
Vector gn = SS.GW.projRight.Cross(SS.GW.projUp);
v = v.Plus(gn.ScaledBy(4/SS.GW.scale));
glxColor3d(0, 0.8, 0);
glBegin(GL_QUADS);
glxVertex3v(v.Plus (r).Plus (d));
glxVertex3v(v.Plus (r).Minus(d));
glxVertex3v(v.Minus(r).Minus(d));
glxVertex3v(v.Minus(r).Plus (d));
glEnd();
} else {
Point2d pp = SS.GW.ProjectPoint(v);
// Make a free point slightly easier to select, so that with
// coincident points, we select the free one.
dogd.dmin = pp.DistanceTo(dogd.mp) - 4;
}
break;
}
case NORMAL_IN_3D:
case NORMAL_IN_2D:
case NORMAL_XFRMD: {
if(order >= 0 && order != 2) break;
if(!SS.GW.showNormals) break;
hRequest hr = h.request();
double f = 0.5;
if(hr.v == Request::HREQUEST_REFERENCE_XY.v) {
glxColor3d(0, 0, f);
} else if(hr.v == Request::HREQUEST_REFERENCE_YZ.v) {
glxColor3d(f, 0, 0);
} else if(hr.v == Request::HREQUEST_REFERENCE_ZX.v) {
glxColor3d(0, f, 0);
} else {
glxColor3d(0, 0.4, 0.4);
}
Quaternion q = NormalGetNum();
Vector tail = SS.GetEntity(point[0])->PointGetNum();
Vector v = (q.RotationN()).WithMagnitude(50/SS.GW.scale);
Vector tip = tail.Plus(v);
LineDrawOrGetDistance(tail, tip);
v = v.WithMagnitude(12);
Vector axis = q.RotationV();
LineDrawOrGetDistance(tip, tip.Minus(v.RotatedAbout(axis, 0.6)));
LineDrawOrGetDistance(tip, tip.Minus(v.RotatedAbout(axis, -0.6)));
break;
}
case DISTANCE:
case DISTANCE_XFRMD:
// These are used only as data structures, nothing to display.
break;
case WORKPLANE: {
if(order >= 0 && order != 0) break;
if(!SS.GW.showWorkplanes) break;
Vector p;
p = SS.GetEntity(point[0])->PointGetNum();
Vector u = Normal()->NormalU();
Vector v = Normal()->NormalV();
double s = (min(SS.GW.width, SS.GW.height))*0.4/SS.GW.scale;
Vector us = u.ScaledBy(s);
Vector vs = v.ScaledBy(s);
Vector pp = p.Plus (us).Plus (vs);
Vector pm = p.Plus (us).Minus(vs);
Vector mm = p.Minus(us).Minus(vs);
Vector mp = p.Minus(us).Plus (vs);
glxColor3d(0, 0.3, 0.3);
LineDrawOrGetDistance(pp, pm);
LineDrawOrGetDistance(pm, mm);
LineDrawOrGetDistance(mm, mp);
LineDrawOrGetDistance(mp, pp);
if(dogd.drawing) {
glPushMatrix();
glxTranslatev(mm);
glxOntoWorkplane(u, v);
glxWriteText(DescriptionString());
glPopMatrix();
} else {
// If a line lies in a plane, then select the line, not
// the plane.
dogd.dmin += 3;
}
break;
}
case LINE_SEGMENT: {
if(order >= 0 && order != 1) break;
Vector a = SS.GetEntity(point[0])->PointGetNum();
Vector b = SS.GetEntity(point[1])->PointGetNum();
LineDrawOrGetDistanceOrEdge(a, b);
break;
}
case CUBIC: {
if(order >= 0 && order != 1) break;
Vector p0 = SS.GetEntity(point[0])->PointGetNum();
Vector p1 = SS.GetEntity(point[1])->PointGetNum();
Vector p2 = SS.GetEntity(point[2])->PointGetNum();
Vector p3 = SS.GetEntity(point[3])->PointGetNum();
int i, n = 20;
Vector prev = p0;
for(i = 1; i <= n; i++) {
double t = ((double)i)/n;
Vector p =
(p0.ScaledBy((1 - t)*(1 - t)*(1 - t))).Plus(
(p1.ScaledBy(3*t*(1 - t)*(1 - t))).Plus(
(p2.ScaledBy(3*t*t*(1 - t))).Plus(
(p3.ScaledBy(t*t*t)))));
LineDrawOrGetDistanceOrEdge(prev, p);
prev = p;
}
break;
}
case CIRCLE: {
if(order >= 0 && order != 1) break;
Quaternion q = SS.GetEntity(normal)->NormalGetNum();
double r = SS.GetEntity(distance)->DistanceGetNum();
Vector center = SS.GetEntity(point[0])->PointGetNum();
Vector u = q.RotationU(), v = q.RotationV();
int i, c = 20;
Vector prev = u.ScaledBy(r).Plus(center);
for(i = 1; i <= c; i++) {
double phi = (2*PI*i)/c;
Vector p = (u.ScaledBy(r*cos(phi))).Plus(
v.ScaledBy(r*sin(phi)));
p = p.Plus(center);
LineDrawOrGetDistanceOrEdge(prev, p);
prev = p;
}
break;
}
default:
oops();
}
}
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