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solvespace/drawentity.cpp

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#include "solvespace.h"
char *Entity::DescriptionString(void) {
if(h.isFromRequest()) {
Request *r = SS.GetRequest(h.request());
return r->DescriptionString();
} else {
Group *g = SS.GetGroup(h.group());
return g->DescriptionString();
}
}
void Entity::LineDrawOrGetDistance(Vector a, Vector b) {
if(dogd.drawing) {
// Draw lines from active group in front of those from previous
glxDepthRangeOffset((group.v == SS.GW.activeGroup.v) ? 4 : 3);
glBegin(GL_LINES);
glxVertex3v(a);
glxVertex3v(b);
glEnd();
glxDepthRangeOffset(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 Entity::DrawAll(void) {
// This handles points and line segments as a special case, because I
// seem to be able to get a huge speedup that way, by consolidating
// stuff to gl.
int i;
if(SS.GW.showPoints) {
double s = 3.5/SS.GW.scale;
Vector r = SS.GW.projRight.ScaledBy(s);
Vector d = SS.GW.projUp.ScaledBy(s);
glxColor3d(0, 0.8, 0);
glxDepthRangeOffset(6);
glBegin(GL_QUADS);
for(i = 0; i < SS.entity.n; i++) {
Entity *e = &(SS.entity.elem[i]);
if(!e->IsPoint()) continue;
if(!(SS.GetGroup(e->group)->visible)) continue;
if(SS.GroupsInOrder(SS.GW.activeGroup, e->group)) continue;
if(e->forceHidden) continue;
Vector v = e->PointGetNum();
bool free = false;
if(e->type == POINT_IN_3D) {
Param *px = SS.GetParam(e->param[0]),
*py = SS.GetParam(e->param[1]),
*pz = SS.GetParam(e->param[2]);
free = (px->free) || (py->free) || (pz->free);
} else if(e->type == POINT_IN_2D) {
Param *pu = SS.GetParam(e->param[0]),
*pv = SS.GetParam(e->param[1]);
free = (pu->free) || (pv->free);
}
if(free) {
Vector re = r.ScaledBy(2.5), de = d.ScaledBy(2.5);
glxColor3d(0, 1.0, 1.0);
glxVertex3v(v.Plus (re).Plus (de));
glxVertex3v(v.Plus (re).Minus(de));
glxVertex3v(v.Minus(re).Minus(de));
glxVertex3v(v.Minus(re).Plus (de));
glxColor3d(0, 0.8, 0);
}
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();
glxDepthRangeOffset(0);
}
glLineWidth(1.5);
for(i = 0; i < SS.entity.n; i++) {
Entity *e = &(SS.entity.elem[i]);
if(e->IsPoint())
{
continue; // already handled
}
e->Draw();
}
glLineWidth(1);
}
void Entity::Draw(void) {
dogd.drawing = true;
DrawOrGetDistance();
}
void Entity::GenerateEdges(SEdgeList *el, bool includingConstruction) {
if(construction && !includingConstruction) return;
SBezierList sbl;
ZERO(&sbl);
GenerateBezierCurves(&sbl);
int i, j;
for(i = 0; i < sbl.l.n; i++) {
SBezier *sb = &(sbl.l.elem[i]);
List<Vector> lv;
ZERO(&lv);
sb->MakePwlInto(&lv);
for(j = 1; j < lv.n; j++) {
el->AddEdge(lv.elem[j-1], lv.elem[j]);
}
lv.Clear();
}
sbl.Clear();
}
double Entity::GetDistance(Point2d mp) {
dogd.drawing = false;
dogd.mp = mp;
dogd.dmin = 1e12;
DrawOrGetDistance();
return dogd.dmin;
}
Vector Entity::GetReferencePos(void) {
dogd.drawing = false;
dogd.refp = SS.GW.offset.ScaledBy(-1);
DrawOrGetDistance();
return dogd.refp;
}
bool Entity::IsVisible(void) {
Group *g = SS.GetGroup(group);
if(g->h.v == Group::HGROUP_REFERENCES.v && IsNormal()) {
// The reference normals are always shown
return true;
}
if(!g->visible) return false;
if(SS.GroupsInOrder(SS.GW.activeGroup, group)) return false;
// Don't check if points are hidden; this gets called only for
// selected or hovered points, and those should always be shown.
if(IsNormal() && !SS.GW.showNormals) return false;
if(!SS.GW.showWorkplanes) {
if(IsWorkplane() && !h.isFromRequest()) {
if(g->h.v != SS.GW.activeGroup.v) {
// The group-associated workplanes are hidden outside
// their group.
return false;
}
}
}
if(forceHidden) return false;
return true;
}
void Entity::GenerateBezierCurves(SBezierList *sbl) {
SBezier sb;
switch(type) {
case LINE_SEGMENT: {
Vector a = SS.GetEntity(point[0])->PointGetNum();
Vector b = SS.GetEntity(point[1])->PointGetNum();
sb = SBezier::From(a, b);
sbl->l.Add(&sb);
break;
}
case CUBIC: {
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();
sb = SBezier::From(p0, p1, p2, p3);
sbl->l.Add(&sb);
break;
}
case CIRCLE:
case ARC_OF_CIRCLE: {
Vector center = SS.GetEntity(point[0])->PointGetNum();
Quaternion q = SS.GetEntity(normal)->NormalGetNum();
Vector u = q.RotationU(), v = q.RotationV();
double r = CircleGetRadiusNum();
double thetaa, thetab, dtheta;
if(r < LENGTH_EPS) {
// If a circle or an arc gets dragged through zero radius,
// then we just don't generate anything.
break;
}
if(type == CIRCLE) {
thetaa = 0;
thetab = 2*PI;
dtheta = 2*PI;
} else {
ArcGetAngles(&thetaa, &thetab, &dtheta);
}
int i, n;
if(dtheta > 3*PI/2) {
n = 4;
} else if(dtheta > PI) {
n = 3;
} else if(dtheta > PI/2) {
n = 2;
} else {
n = 1;
}
dtheta /= n;
for(i = 0; i < n; i++) {
double s, c;
c = cos(thetaa);
s = sin(thetaa);
// The start point of the curve, and the tangent vector at
// that start point.
Vector p0 = center.Plus(u.ScaledBy( r*c)).Plus(v.ScaledBy(r*s)),
t0 = u.ScaledBy(-r*s). Plus(v.ScaledBy(r*c));
thetaa += dtheta;
c = cos(thetaa);
s = sin(thetaa);
Vector p2 = center.Plus(u.ScaledBy( r*c)).Plus(v.ScaledBy(r*s)),
t2 = u.ScaledBy(-r*s). Plus(v.ScaledBy(r*c));
// The control point must lie on both tangents.
Vector p1 = Vector::AtIntersectionOfLines(p0, p0.Plus(t0),
p2, p2.Plus(t2),
NULL);
SBezier sb = SBezier::From(p0, p1, p2);
sb.weight[1] = cos(dtheta/2);
sbl->l.Add(&sb);
}
break;
}
case TTF_TEXT: {
Vector topLeft = SS.GetEntity(point[0])->PointGetNum();
Vector botLeft = SS.GetEntity(point[1])->PointGetNum();
Vector n = Normal()->NormalN();
Vector v = topLeft.Minus(botLeft);
Vector u = (v.Cross(n)).WithMagnitude(v.Magnitude());
SS.fonts.PlotString(font.str, str.str, 0, sbl, botLeft, u, v);
break;
}
default:
// Not a problem, points and normals and such don't generate curves
break;
}
}
void Entity::DrawOrGetDistance(void) {
if(!IsVisible()) return;
Group *g = SS.GetGroup(group);
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_N_COPY:
case POINT_N_TRANS:
case POINT_N_ROT_TRANS:
case POINT_N_ROT_AA:
case POINT_IN_3D:
case POINT_IN_2D: {
Vector v = PointGetNum();
dogd.refp = v;
if(dogd.drawing) {
double s = 3.5;
Vector r = SS.GW.projRight.ScaledBy(s/SS.GW.scale);
Vector d = SS.GW.projUp.ScaledBy(s/SS.GW.scale);
glxColor3d(0, 0.8, 0);
glxDepthRangeOffset(6);
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();
glxDepthRangeOffset(0);
} else {
Point2d pp = SS.GW.ProjectPoint(v);
dogd.dmin = pp.DistanceTo(dogd.mp) - 6;
}
break;
}
case NORMAL_N_COPY:
case NORMAL_N_ROT:
case NORMAL_N_ROT_AA:
case NORMAL_IN_3D:
case NORMAL_IN_2D: {
int i;
for(i = 0; i < 2; i++) {
hRequest hr = h.request();
double f = (i == 0 ? 0.4 : 1);
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);
if(i > 0) break;
}
Quaternion q = NormalGetNum();
Vector tail;
if(i == 0) {
tail = SS.GetEntity(point[0])->PointGetNum();
glLineWidth(1);
} else {
// Draw an extra copy of the x, y, and z axes, that's
// always in the corner of the view and at the front.
// So those are always available, perhaps useful.
double s = SS.GW.scale;
double h = 60 - SS.GW.height/2;
double w = 60 - SS.GW.width/2;
tail = SS.GW.projRight.ScaledBy(w/s).Plus(
SS.GW.projUp. ScaledBy(h/s)).Minus(SS.GW.offset);
glxDepthRangeLockToFront(true);
glLineWidth(2);
}
Vector v = (q.RotationN()).WithMagnitude(50/SS.GW.scale);
Vector tip = tail.Plus(v);
LineDrawOrGetDistance(tail, tip);
v = v.WithMagnitude(12/SS.GW.scale);
Vector axis = q.RotationV();
LineDrawOrGetDistance(tip,tip.Minus(v.RotatedAbout(axis, 0.6)));
LineDrawOrGetDistance(tip,tip.Minus(v.RotatedAbout(axis,-0.6)));
}
glxDepthRangeLockToFront(false);
glLineWidth(1.5);
break;
}
case DISTANCE:
case DISTANCE_N_COPY:
// These are used only as data structures, nothing to display.
break;
case WORKPLANE: {
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))*0.45/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), mm2 = mm;
Vector mp = p.Minus(us).Plus (vs);
glLineWidth(1);
glxColor3d(0, 0.3, 0.3);
glEnable(GL_LINE_STIPPLE);
glLineStipple(3, 0x1111);
if(!h.isFromRequest()) {
mm = mm.Plus(v.ScaledBy(60/SS.GW.scale));
mm2 = mm2.Plus(u.ScaledBy(60/SS.GW.scale));
LineDrawOrGetDistance(mm2, mm);
}
LineDrawOrGetDistance(pp, pm);
LineDrawOrGetDistance(pm, mm2);
LineDrawOrGetDistance(mm, mp);
LineDrawOrGetDistance(mp, pp);
glDisable(GL_LINE_STIPPLE);
glLineWidth(1.5);
char *str = DescriptionString()+5;
if(dogd.drawing) {
glPushMatrix();
glxTranslatev(mm2);
glxOntoWorkplane(u, v);
glxWriteText(str);
glPopMatrix();
} else {
Vector pos = mm2.Plus(u.ScaledBy(glxStrWidth(str)/2)).Plus(
v.ScaledBy(glxStrHeight()/2));
Point2d pp = SS.GW.ProjectPoint(pos);
dogd.dmin = min(dogd.dmin, pp.DistanceTo(dogd.mp) - 10);
// If a line lies in a plane, then select the line, not
// the plane.
dogd.dmin += 3;
}
break;
}
case LINE_SEGMENT:
case CIRCLE:
case ARC_OF_CIRCLE:
case CUBIC:
case TTF_TEXT:
// Nothing but the curve(s).
break;
case FACE_NORMAL_PT:
case FACE_XPROD:
case FACE_N_ROT_TRANS:
case FACE_N_TRANS:
case FACE_N_ROT_AA:
// Do nothing; these are drawn with the triangle mesh
break;
default:
oops();
}
// And draw the curves; generate the rational polynomial curves for
// everything, then piecewise linearize them, and display those.
SEdgeList sel;
ZERO(&sel);
GenerateEdges(&sel, true);
int i;
for(i = 0; i < sel.l.n; i++) {
SEdge *se = &(sel.l.elem[i]);
LineDrawOrGetDistance(se->a, se->b);
}
sel.Clear();
}
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