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Copy pathdrawconstraint.cpp
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1363 lines (1195 loc) · 52.9 KB
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//-----------------------------------------------------------------------------
// Given a constraint, draw a graphical and user-selectable representation
// of that constraint on-screen. We can either draw with gl, or compute the
// distance from a point (the location of the mouse pointer) to the lines
// that we would have drawn, for selection.
//
// Copyright 2008-2013 Jonathan Westhues.
//-----------------------------------------------------------------------------
#include "solvespace.h"
std::string Constraint::Label() const {
std::string result;
if(type == Type::ANGLE) {
result = SS.DegreeToString(valA) + "°";
} else if(type == Type::LENGTH_RATIO || type == Type::ARC_ARC_LEN_RATIO || type == Type::ARC_LINE_LEN_RATIO) {
result = ssprintf("%.3f:1", valA);
} else if(type == Type::COMMENT) {
result = comment;
} else if(type == Type::DIAMETER) {
if(!other) {
result = "⌀" + SS.MmToStringSI(valA);
} else {
result = "R" + SS.MmToStringSI(valA / 2);
}
} else {
// valA has units of distance
result = SS.MmToStringSI(fabs(valA));
}
if(reference) {
result += " REF";
}
return result;
}
void Constraint::DoLine(Canvas *canvas, Canvas::hStroke hcs, Vector a, Vector b) {
const Camera &camera = canvas->GetCamera();
a = camera.AlignToPixelGrid(a);
b = camera.AlignToPixelGrid(b);
canvas->DrawLine(a, b, hcs);
}
void Constraint::DoStippledLine(Canvas *canvas, Canvas::hStroke hcs, Vector a, Vector b) {
Canvas::Stroke strokeStippled = *canvas->strokes.FindById(hcs);
strokeStippled.stipplePattern = StipplePattern::SHORT_DASH;
strokeStippled.stippleScale = 4.0;
Canvas::hStroke hcsStippled = canvas->GetStroke(strokeStippled);
DoLine(canvas, hcsStippled, a, b);
}
void Constraint::DoLabel(Canvas *canvas, Canvas::hStroke hcs,
Vector ref, Vector *labelPos, Vector gr, Vector gu) {
const Camera &camera = canvas->GetCamera();
std::string s = Label();
double textHeight = Style::TextHeight(GetStyle()) / camera.scale;
double swidth = VectorFont::Builtin()->GetWidth(textHeight, s),
sheight = VectorFont::Builtin()->GetCapHeight(textHeight);
// 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 == 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
uint32_t o = (uint32_t)st->textOrigin;
if(o & (uint32_t)Style::TextOrigin::LEFT) ref = ref.Plus(gr.WithMagnitude(swidth/2));
if(o & (uint32_t)Style::TextOrigin::RIGHT) ref = ref.Minus(gr.WithMagnitude(swidth/2));
if(o & (uint32_t)Style::TextOrigin::BOT) ref = ref.Plus(gu.WithMagnitude(sheight/2));
if(o & (uint32_t)Style::TextOrigin::TOP) ref = ref.Minus(gu.WithMagnitude(sheight/2));
}
Vector o = ref.Minus(gr.WithMagnitude(swidth/2)).Minus(
gu.WithMagnitude(sheight/2));
canvas->DrawVectorText(s, textHeight, o, gr.WithMagnitude(1), gu.WithMagnitude(1), hcs);
if(labelPos) *labelPos = o;
}
void Constraint::DoProjectedPoint(Canvas *canvas, Canvas::hStroke hcs,
Vector *r, Vector n, Vector o) {
double d = r->DistanceToPlane(n, o);
Vector p = r->Minus(n.ScaledBy(d));
DoStippledLine(canvas, hcs, p, *r);
*r = p;
}
void Constraint::DoProjectedPoint(Canvas *canvas, Canvas::hStroke hcs, Vector *r) {
Vector p = r->ProjectInto(workplane);
DoStippledLine(canvas, hcs, p, *r);
*r = p;
}
//-----------------------------------------------------------------------------
// There is a rectangular box, aligned to our display axes (projRight, projUp)
// centered at ref. This is where a dimension label will be drawn. We want to
// draw a line from A to B. If that line would intersect the label box, then
// trim the line to leave a gap for it, and return zero. If not, then extend
// the line to almost meet the box, and return either positive or negative,
// depending whether that extension was from A or from B.
//-----------------------------------------------------------------------------
int Constraint::DoLineTrimmedAgainstBox(Canvas *canvas, Canvas::hStroke hcs,
Vector ref, Vector a, Vector b, bool extend) {
const Camera &camera = canvas->GetCamera();
double th = Style::TextHeight(GetStyle()) / camera.scale;
double pixels = 1.0 / camera.scale;
double swidth = VectorFont::Builtin()->GetWidth(th, Label()) + 8 * pixels,
sheight = VectorFont::Builtin()->GetCapHeight(th) + 8 * pixels;
Vector gu = camera.projUp.WithMagnitude(1),
gr = camera.projRight.WithMagnitude(1);
return DoLineTrimmedAgainstBox(canvas, hcs, ref, a, b, extend, gr, gu, swidth, sheight);
}
int Constraint::DoLineTrimmedAgainstBox(Canvas *canvas, Canvas::hStroke hcs,
Vector ref, Vector a, Vector b, bool extend,
Vector gr, Vector gu, double swidth, double sheight) {
struct {
Vector n;
double d;
} planes[4];
// reference pos is the center of box occupied by text; build a rectangle
// around that, aligned to axes gr and gu, from four planes will all four
// normals pointing inward
planes[0].n = gu.ScaledBy(-1); planes[0].d = -(gu.Dot(ref) + sheight/2);
planes[1].n = gu; planes[1].d = gu.Dot(ref) - sheight/2;
planes[2].n = gr; planes[2].d = gr.Dot(ref) - swidth/2;
planes[3].n = gr.ScaledBy(-1); planes[3].d = -(gr.Dot(ref) + swidth/2);
double tmin = VERY_POSITIVE, tmax = VERY_NEGATIVE;
Vector dl = b.Minus(a);
for(int i = 0; i < 4; i++) {
bool parallel;
Vector p = Vector::AtIntersectionOfPlaneAndLine(
planes[i].n, planes[i].d,
a, b, ¶llel);
if(parallel) continue;
int j;
for(j = 0; j < 4; j++) {
double d = (planes[j].n).Dot(p) - planes[j].d;
if(d < -LENGTH_EPS) break;
}
if(j < 4) continue;
double t = (p.Minus(a)).DivProjected(dl);
tmin = min(t, tmin);
tmax = max(t, tmax);
}
// Both in range; so there's pieces of the line on both sides of the label box.
if(tmin >= 0.0 && tmin <= 1.0 && tmax >= 0.0 && tmax <= 1.0) {
DoLine(canvas, hcs, a, a.Plus(dl.ScaledBy(tmin)));
DoLine(canvas, hcs, a.Plus(dl.ScaledBy(tmax)), b);
return 0;
}
// Only one intersection in range; so the box is right on top of the endpoint
if(tmin >= 0.0 && tmin <= 1.0) {
DoLine(canvas, hcs, a, a.Plus(dl.ScaledBy(tmin)));
return 0;
}
// Likewise.
if(tmax >= 0.0 && tmax <= 1.0) {
DoLine(canvas, hcs, a.Plus(dl.ScaledBy(tmax)), b);
return 0;
}
// The line does not intersect the label; so the line should get
// extended to just barely meet the label.
// 0 means the label lies within the line, negative means it's outside
// and closer to b, positive means outside and closer to a.
if(tmax < 0.0) {
if(extend) a = a.Plus(dl.ScaledBy(tmax));
DoLine(canvas, hcs, a, b);
return 1;
}
if(tmin > 1.0) {
if(extend) b = a.Plus(dl.ScaledBy(tmin));
DoLine(canvas, hcs, a, b);
return -1;
}
// This will happen if the entire line lies within the box.
return 0;
}
void Constraint::DoArrow(Canvas *canvas, Canvas::hStroke hcs,
Vector p, Vector dir, Vector n, double width, double angle, double da) {
dir = dir.WithMagnitude(width / cos(angle));
dir = dir.RotatedAbout(n, da);
DoLine(canvas, hcs, p, p.Plus(dir.RotatedAbout(n, angle)));
DoLine(canvas, hcs, p, p.Plus(dir.RotatedAbout(n, -angle)));
}
//-----------------------------------------------------------------------------
// Draw a line with arrows on both ends, and possibly a gap in the middle for
// the dimension. We will use these for most length dimensions. The length
// being dimensioned is from A to B; but those points get extended perpendicular
// to the line AB, until the line between the extensions crosses ref (the
// center of the label).
//-----------------------------------------------------------------------------
void Constraint::DoLineWithArrows(Canvas *canvas, Canvas::hStroke hcs,
Vector ref, Vector a, Vector b,
bool onlyOneExt)
{
const Camera &camera = canvas->GetCamera();
double pixels = 1.0 / camera.scale;
Vector ab = a.Minus(b);
Vector ar = a.Minus(ref);
// Normal to a plane containing the line and the label origin.
Vector n = ab.Cross(ar);
// Within that plane, and normal to the line AB; so that's our extension
// line.
Vector out = ab.Cross(n).WithMagnitude(1);
out = out.ScaledBy(-out.Dot(ar));
Vector ae = a.Plus(out), be = b.Plus(out);
// Extension lines extend 10 pixels beyond where the arrows get
// drawn (which is at the same offset perpendicular from AB as the
// label).
DoLine(canvas, hcs, a, ae.Plus(out.WithMagnitude(10*pixels)));
if(!onlyOneExt) {
DoLine(canvas, hcs, b, be.Plus(out.WithMagnitude(10*pixels)));
}
int within = DoLineTrimmedAgainstBox(canvas, hcs, ref, ae, be);
// Arrow heads are 13 pixels long, with an 18 degree half-angle.
double theta = 18*PI/180;
Vector arrow = (be.Minus(ae)).WithMagnitude(13*pixels);
if(within != 0) {
arrow = arrow.ScaledBy(-1);
Vector seg = (be.Minus(ae)).WithMagnitude(18*pixels);
if(within < 0) DoLine(canvas, hcs, ae, ae.Minus(seg));
if(within > 0) DoLine(canvas, hcs, be, be.Plus(seg));
}
DoArrow(canvas, hcs, ae, arrow, n, 13.0 * pixels, theta, 0.0);
DoArrow(canvas, hcs, be, arrow.Negated(), n, 13.0 * pixels, theta, 0.0);
}
void Constraint::DoEqualLenTicks(Canvas *canvas, Canvas::hStroke hcs,
Vector a, Vector b, Vector gn, Vector *refp) {
const Camera &camera = canvas->GetCamera();
Vector m = (a.ScaledBy(1.0/3)).Plus(b.ScaledBy(2.0/3));
if(refp) *refp = m;
Vector ab = a.Minus(b);
Vector n = (gn.Cross(ab)).WithMagnitude(10/camera.scale);
DoLine(canvas, hcs, m.Minus(n), m.Plus(n));
}
void Constraint::DoEqualRadiusTicks(Canvas *canvas, Canvas::hStroke hcs,
hEntity he, Vector *refp) {
const Camera &camera = canvas->GetCamera();
Entity *circ = SK.GetEntity(he);
Vector center = SK.GetEntity(circ->point[0])->PointGetDrawNum();
double r = circ->CircleGetRadiusNum();
Quaternion q = circ->Normal()->NormalGetNum();
Vector u = q.RotationU(), v = q.RotationV();
double theta;
if(circ->type == Entity::Type::CIRCLE) {
theta = PI/2;
} else if(circ->type == Entity::Type::ARC_OF_CIRCLE) {
double thetaa, thetab, dtheta;
circ->ArcGetAngles(&thetaa, &thetab, &dtheta);
theta = thetaa + dtheta/2;
} else ssassert(false, "Unexpected entity type");
Vector d = u.ScaledBy(cos(theta)).Plus(v.ScaledBy(sin(theta)));
d = d.ScaledBy(r);
Vector p = center.Plus(d);
if(refp) *refp = p;
Vector tick = d.WithMagnitude(10/camera.scale);
DoLine(canvas, hcs, p.Plus(tick), p.Minus(tick));
}
void Constraint::DoArcForAngle(Canvas *canvas, Canvas::hStroke hcs,
Vector a0, Vector da, Vector b0, Vector db,
Vector offset, Vector *ref, bool trim,
Vector explodeOffset)
{
const Camera &camera = canvas->GetCamera();
double pixels = 1.0 / camera.scale;
Vector gr = camera.projRight.ScaledBy(1.0);
Vector gu = camera.projUp.ScaledBy(1.0);
if(workplane != Entity::FREE_IN_3D) {
a0 = a0.ProjectInto(workplane);
b0 = b0.ProjectInto(workplane);
da = da.ProjectVectorInto(workplane);
db = db.ProjectVectorInto(workplane);
}
a0 = a0.Plus(explodeOffset);
b0 = b0.Plus(explodeOffset);
Vector a1 = a0.Plus(da);
Vector b1 = b0.Plus(db);
bool skew;
Vector pi = Vector::AtIntersectionOfLines(a0, a0.Plus(da),
b0, b0.Plus(db), &skew);
if(!skew) {
*ref = pi.Plus(offset);
// We draw in a coordinate system centered at the intersection point.
// One basis vector is da, and the other is normal to da and in
// the plane that contains our lines (so normal to its normal).
da = da.WithMagnitude(1);
db = db.WithMagnitude(1);
Vector norm = da.Cross(db);
Vector dna = norm.Cross(da).WithMagnitude(1.0);
Vector dnb = norm.Cross(db).WithMagnitude(1.0);
// da and db magnitudes are 1.0
double thetaf = acos(da.Dot(db));
// Calculate median
Vector m = da.ScaledBy(cos(thetaf/2)).Plus(
dna.ScaledBy(sin(thetaf/2)));
Vector rm = (*ref).Minus(pi);
// Test which side we have to place an arc
if(m.Dot(rm) < 0) {
da = da.ScaledBy(-1); dna = dna.ScaledBy(-1);
db = db.ScaledBy(-1); dnb = dnb.ScaledBy(-1);
}
double rda = rm.Dot(da), rdna = rm.Dot(dna);
// Introduce minimal arc radius in pixels
double r = max(sqrt(rda*rda + rdna*rdna), 15.0 * pixels);
double th = Style::TextHeight(GetStyle()) / camera.scale;
double swidth = VectorFont::Builtin()->GetWidth(th, Label()) + 8*pixels,
sheight = VectorFont::Builtin()->GetCapHeight(th) + 6*pixels;
double textR = sqrt(swidth * swidth + sheight * sheight) / 2.0;
*ref = pi.Plus(rm.WithMagnitude(std::max(rm.Magnitude(), 15 * pixels + textR)));
// Arrow points
Vector apa = da. ScaledBy(r).Plus(pi);
Vector apb = da. ScaledBy(r*cos(thetaf)).Plus(
dna.ScaledBy(r*sin(thetaf))).Plus(pi);
double arrowW = 13 * pixels;
double arrowA = 18.0 * PI / 180.0;
bool arrowVisible = apb.Minus(apa).Magnitude() > 2.5 * arrowW;
// Arrow reversing indicator
bool arrowRev = false;
// The minimal extension length in angular representation
double extAngle = 18 * pixels / r;
// Arc additional angle
double addAngle = 0.0;
// Arc start angle
double startAngle = 0.0;
// Arc extension to db.
// We have just enlarge angle value.
if(HasLabel() && rm.Dot(dnb) > 0.0) {
// rm direction projected to plane with u = da, v = dna
Vector rmp = da.ScaledBy(rda).Plus(dna.ScaledBy(rdna)).WithMagnitude(1.0);
// rmp and db magnitudes are 1.0
addAngle = std::max(acos(rmp.Dot(db)), extAngle);
if(arrowVisible) {
startAngle = -extAngle;
addAngle += extAngle;
arrowRev = true;
}
}
// Arc extension to da.
// We are enlarge angle value and rewrite basis to align along rm projection.
if(HasLabel() && rm.Dot(dna) < 0.0) {
// rm direction projected to plane with u = da, v = dna
Vector rmp = da.ScaledBy(rda).Plus(dna.ScaledBy(rdna)).WithMagnitude(1.0);
// rmp and da magnitudes are 1.0
startAngle = -std::max(acos(rmp.Dot(da)), extAngle);
addAngle = -startAngle;
if(arrowVisible) {
addAngle += extAngle;
arrowRev = true;
}
}
Vector prev;
int n = 30;
for(int i = 0; i <= n; i++) {
double theta = startAngle + (i*(thetaf + addAngle))/n;
Vector p = da.ScaledBy(r*cos(theta)).Plus(
dna.ScaledBy(r*sin(theta))).Plus(pi);
if(i > 0) {
if(trim) {
DoLineTrimmedAgainstBox(canvas, hcs, *ref, prev, p,
/*extend=*/false, gr, gu, swidth, sheight + 2*pixels);
} else {
DoLine(canvas, hcs, prev, p);
}
}
prev = p;
}
DoLineExtend(canvas, hcs, a0, a1, apa, 5.0 * pixels);
DoLineExtend(canvas, hcs, b0, b1, apb, 5.0 * pixels);
// Draw arrows only when we have enough space.
if(arrowVisible) {
double angleCorr = arrowW / (2.0 * r);
if(arrowRev) {
dna = dna.ScaledBy(-1.0);
angleCorr = -angleCorr;
}
DoArrow(canvas, hcs, apa, dna, norm, arrowW, arrowA, angleCorr);
DoArrow(canvas, hcs, apb, dna, norm, arrowW, arrowA, thetaf + PI - angleCorr);
}
} else {
// The lines are skew; no wonderful way to illustrate that.
*ref = a0.Plus(b0);
*ref = (*ref).ScaledBy(0.5).Plus(disp.offset);
gu = gu.WithMagnitude(1);
double textHeight = Style::TextHeight(GetStyle()) / camera.scale;
Vector trans =
(*ref).Plus(gu.ScaledBy(-1.5*VectorFont::Builtin()->GetCapHeight(textHeight)));
canvas->DrawVectorText("angle between skew lines", textHeight,
trans, gr.WithMagnitude(1), gu.WithMagnitude(1),
hcs);
}
}
bool Constraint::IsVisible() const {
if(!SS.GW.showConstraints) return false;
Group *g = SK.GetGroup(group);
// If the group is hidden, then the constraints are hidden and not
// able to be selected.
if(!(g->visible)) return false;
// And likewise if the group is not the active group; except for comments
// with an assigned style.
if(g->h != SS.GW.activeGroup && !(type == Type::COMMENT && disp.style.v)) {
return false;
}
if(disp.style.v) {
Style *s = Style::Get(disp.style);
if(!s->visible) return false;
}
return true;
}
bool Constraint::DoLineExtend(Canvas *canvas, Canvas::hStroke hcs,
Vector p0, Vector p1, Vector pt, double salient) {
Vector dir = p1.Minus(p0);
double k = dir.Dot(pt.Minus(p0)) / dir.Dot(dir);
Vector ptOnLine = p0.Plus(dir.ScaledBy(k));
// Draw projection line.
DoLine(canvas, hcs, pt, ptOnLine);
// Calculate salient direction.
Vector sd = dir.WithMagnitude(1.0).ScaledBy(salient);
Vector from;
Vector to;
if(k < 0.0) {
from = p0;
to = ptOnLine.Minus(sd);
} else if(k > 1.0) {
from = p1;
to = ptOnLine.Plus(sd);
} else {
return false;
}
// Draw extension line.
DoLine(canvas, hcs, from, to);
return true;
}
void Constraint::DoLayout(DrawAs how, Canvas *canvas,
Vector *labelPos, std::vector<Vector> *refs) {
if(!(how == DrawAs::HOVERED || how == DrawAs::SELECTED) &&
!IsVisible()) return;
// Unit vectors that describe our current view of the scene. One pixel
// long, not one actual unit.
const Camera &camera = canvas->GetCamera();
Vector gr = camera.projRight.ScaledBy(1/camera.scale);
Vector gu = camera.projUp.ScaledBy(1/camera.scale);
Vector gn = (gr.Cross(gu)).WithMagnitude(1/camera.scale);
double textHeight = Style::TextHeight(GetStyle()) / camera.scale;
RgbaColor color = {};
switch(how) {
case DrawAs::DEFAULT: color = Style::Color(GetStyle()); break;
case DrawAs::HOVERED: color = Style::Color(Style::HOVERED); break;
case DrawAs::SELECTED: color = Style::Color(Style::SELECTED); break;
}
Canvas::Stroke stroke = Style::Stroke(GetStyle());
stroke.layer = Canvas::Layer::FRONT;
stroke.color = color;
stroke.zIndex = 4;
Canvas::hStroke hcs = canvas->GetStroke(stroke);
Canvas::Fill fill = {};
fill.layer = Canvas::Layer::FRONT;
fill.color = color;
fill.zIndex = stroke.zIndex;
Canvas::hFill hcf = canvas->GetFill(fill);
switch(type) {
case Type::PT_PT_DISTANCE: {
Vector ap = SK.GetEntity(ptA)->PointGetNum();
Vector bp = SK.GetEntity(ptB)->PointGetNum();
if(workplane != Entity::FREE_IN_3D) {
DoProjectedPoint(canvas, hcs, &ap);
DoProjectedPoint(canvas, hcs, &bp);
}
if(ShouldDrawExploded()) {
// Offset A and B by the same offset so the constraint is drawn
// in the plane of one of the exploded points (rather than at an
// angle)
Vector offset = SK.GetEntity(ptA)->ExplodeOffset();
ap = ap.Plus(offset);
bp = bp.Plus(offset);
}
Vector ref = ((ap.Plus(bp)).ScaledBy(0.5)).Plus(disp.offset);
if(refs) refs->push_back(ref);
DoLineWithArrows(canvas, hcs, ref, ap, bp, /*onlyOneExt=*/false);
DoLabel(canvas, hcs, ref, labelPos, gr, gu);
return;
}
case Type::PROJ_PT_DISTANCE: {
Vector ap = SK.GetEntity(ptA)->PointGetNum(),
bp = SK.GetEntity(ptB)->PointGetNum(),
dp = (bp.Minus(ap)),
pp = SK.GetEntity(entityA)->VectorGetNum();
if(ShouldDrawExploded()) {
// explode for whichever point is in the workplane (or the first if both are)
Entity *pt = SK.GetEntity(ptA);
if(pt->group != group) {
pt = SK.GetEntity(ptB);
}
if(pt->group == group) {
Vector offset = pt->ExplodeOffset();
ap = ap.Plus(offset);
bp = bp.Plus(offset);
}
}
Vector ref = ((ap.Plus(bp)).ScaledBy(0.5)).Plus(disp.offset);
if(refs) refs->push_back(ref);
pp = pp.WithMagnitude(1);
double d = dp.Dot(pp);
Vector bpp = ap.Plus(pp.ScaledBy(d));
DoStippledLine(canvas, hcs, ap, bpp);
DoStippledLine(canvas, hcs, bp, bpp);
DoLineWithArrows(canvas, hcs, ref, ap, bpp, /*onlyOneExt=*/false);
DoLabel(canvas, hcs, ref, labelPos, gr, gu);
return;
}
case Type::PT_FACE_DISTANCE:
case Type::PT_PLANE_DISTANCE: {
Vector pt = SK.GetEntity(ptA)->PointGetDrawNum();
Entity *enta = SK.GetEntity(entityA);
Vector n, p;
if(type == Type::PT_PLANE_DISTANCE) {
n = enta->Normal()->NormalN();
p = enta->WorkplaneGetOffset();
} else {
n = enta->FaceGetNormalNum();
p = enta->FaceGetPointNum();
}
double d = (p.Minus(pt)).Dot(n);
Vector closest = pt.Plus(n.WithMagnitude(d));
Vector ref = ((closest.Plus(pt)).ScaledBy(0.5)).Plus(disp.offset);
if(refs) refs->push_back(ref);
if(!pt.Equals(closest)) {
DoLineWithArrows(canvas, hcs, ref, pt, closest, /*onlyOneExt=*/true);
}
DoLabel(canvas, hcs, ref, labelPos, gr, gu);
return;
}
case Type::PT_LINE_DISTANCE: {
Entity *ptEntity = SK.GetEntity(ptA);
Vector pt = ptEntity->PointGetNum();
Entity *line = SK.GetEntity(entityA);
Vector lA = SK.GetEntity(line->point[0])->PointGetNum();
Vector lB = SK.GetEntity(line->point[1])->PointGetNum();
Vector dl = lB.Minus(lA);
if(workplane != Entity::FREE_IN_3D) {
lA = lA.ProjectInto(workplane);
lB = lB.ProjectInto(workplane);
DoProjectedPoint(canvas, hcs, &pt);
}
// Only explode if the point and line are in the same group (and that group is a sketch
// with explode enabled) otherwise it's too visually confusing to figure out what the
// correct projections should be.
bool shouldExplode = ShouldDrawExploded()
&& ptEntity->group == group
&& line->group == group;
if(shouldExplode) {
Vector explodeOffset = ptEntity->ExplodeOffset();
pt = pt.Plus(explodeOffset);
lA = lA.Plus(explodeOffset);
lB = lB.Plus(explodeOffset);
}
// Find the closest point on the line
Vector closest = pt.ClosestPointOnLine(lA, dl);
Vector ref = ((closest.Plus(pt)).ScaledBy(0.5)).Plus(disp.offset);
if(refs) refs->push_back(ref);
DoLabel(canvas, hcs, ref, labelPos, gr, gu);
if(!pt.Equals(closest)) {
DoLineWithArrows(canvas, hcs, ref, pt, closest, /*onlyOneExt=*/true);
// Draw projected point
Vector a = pt;
Vector b = closest;
Vector ab = a.Minus(b);
Vector ar = a.Minus(ref);
Vector n = ab.Cross(ar);
Vector out = ab.Cross(n).WithMagnitude(1);
out = out.ScaledBy(-out.Dot(ar));
Vector be = b.Plus(out);
Vector np = lA.Minus(pt).Cross(lB.Minus(pt)).WithMagnitude(1.0);
DoProjectedPoint(canvas, hcs, &be, np, pt);
// Extensions to line
double pixels = 1.0 / camera.scale;
Vector refClosest = ref.ClosestPointOnLine(lA, dl);
double ddl = dl.Dot(dl);
if(fabs(ddl) > LENGTH_EPS * LENGTH_EPS) {
double t = refClosest.Minus(lA).Dot(dl) / ddl;
if(t < 0.0) {
DoLine(canvas, hcs, refClosest.Minus(dl.WithMagnitude(10.0 * pixels)), lA);
} else if(t > 1.0) {
DoLine(canvas, hcs, refClosest.Plus(dl.WithMagnitude(10.0 * pixels)), lB);
}
}
}
if(workplane != Entity::FREE_IN_3D) {
// Draw the projection marker from the closest point on the
// projected line to the projected point on the real line.
Vector lAB = (lA.Minus(lB));
double t = (lA.Minus(closest)).DivProjected(lAB);
Vector lA = SK.GetEntity(line->point[0])->PointGetNum();
Vector lB = SK.GetEntity(line->point[1])->PointGetNum();
Vector c2 = (lA.ScaledBy(1-t)).Plus(lB.ScaledBy(t));
DoProjectedPoint(canvas, hcs, &c2);
}
return;
}
case Type::DIAMETER: {
Entity *circle = SK.GetEntity(entityA);
Vector center = SK.GetEntity(circle->point[0])->PointGetDrawNum();
Quaternion q = SK.GetEntity(circle->normal)->NormalGetNum();
Vector n = q.RotationN().WithMagnitude(1);
double r = circle->CircleGetRadiusNum();
Vector ref = center.Plus(disp.offset);
// Force the label into the same plane as the circle.
ref = ref.Minus(n.ScaledBy(n.Dot(ref) - n.Dot(center)));
if(refs) refs->push_back(ref);
Vector mark = ref.Minus(center);
mark = mark.WithMagnitude(mark.Magnitude()-r);
DoLineTrimmedAgainstBox(canvas, hcs, ref, ref, ref.Minus(mark));
Vector topLeft;
DoLabel(canvas, hcs, ref, &topLeft, gr, gu);
if(labelPos) *labelPos = topLeft;
return;
}
case Type::POINTS_COINCIDENT: {
if(how == DrawAs::DEFAULT) {
// Let's adjust the color of this constraint to have the same
// rough luma as the point color, so that the constraint does not
// stand out in an ugly way.
RgbaColor cd = Style::Color(Style::DATUM),
cc = Style::Color(Style::CONSTRAINT);
// convert from 8-bit color to a vector
Vector vd = Vector::From(cd.redF(), cd.greenF(), cd.blueF()),
vc = Vector::From(cc.redF(), cc.greenF(), cc.blueF());
// and scale the constraint color to have the same magnitude as
// the datum color, maybe a bit dimmer
vc = vc.WithMagnitude(vd.Magnitude()*0.9);
// and set the color to that.
fill.color = RGBf(vc.x, vc.y, vc.z);
hcf = canvas->GetFill(fill);
}
for(int a = 0; a < 2; a++) {
Vector r = camera.projRight.ScaledBy((a+1)/camera.scale);
Vector d = camera.projUp.ScaledBy((2-a)/camera.scale);
for(int i = 0; i < 2; i++) {
Vector p = SK.GetEntity(i == 0 ? ptA : ptB)->PointGetDrawNum();
if(refs) refs->push_back(p);
canvas->DrawQuad(p.Plus (r).Plus (d),
p.Plus (r).Minus(d),
p.Minus(r).Minus(d),
p.Minus(r).Plus (d),
hcf);
}
}
return;
}
case Type::PT_ON_CIRCLE:
case Type::PT_ON_LINE:
case Type::PT_ON_FACE:
case Type::PT_IN_PLANE: {
double s = 8/camera.scale;
Vector p = SK.GetEntity(ptA)->PointGetDrawNum();
if(refs) refs->push_back(p);
Vector r, d;
if(type == Type::PT_ON_FACE) {
Vector n = SK.GetEntity(entityA)->FaceGetNormalNum();
r = n.Normal(0);
d = n.Normal(1);
} else if(type == Type::PT_IN_PLANE) {
EntityBase *n = SK.GetEntity(entityA)->Normal();
r = n->NormalU();
d = n->NormalV();
} else {
r = gr;
d = gu;
s *= (6.0/8); // draw these a little smaller
}
r = r.WithMagnitude(s); d = d.WithMagnitude(s);
DoLine(canvas, hcs, p.Plus (r).Plus (d), p.Plus (r).Minus(d));
DoLine(canvas, hcs, p.Plus (r).Minus(d), p.Minus(r).Minus(d));
DoLine(canvas, hcs, p.Minus(r).Minus(d), p.Minus(r).Plus (d));
DoLine(canvas, hcs, p.Minus(r).Plus (d), p.Plus (r).Plus (d));
return;
}
case Type::WHERE_DRAGGED: {
Vector p = SK.GetEntity(ptA)->PointGetDrawNum();
if(refs) refs->push_back(p);
Vector u = p.Plus(gu.WithMagnitude(8/camera.scale)).Plus(
gr.WithMagnitude(8/camera.scale)),
uu = u.Minus(gu.WithMagnitude(5/camera.scale)),
ur = u.Minus(gr.WithMagnitude(5/camera.scale));
// Draw four little crop marks, uniformly spaced (by ninety
// degree rotations) around the point.
int i;
for(i = 0; i < 4; i++) {
DoLine(canvas, hcs, u, uu);
DoLine(canvas, hcs, u, ur);
u = u.RotatedAbout(p, gn, PI/2);
ur = ur.RotatedAbout(p, gn, PI/2);
uu = uu.RotatedAbout(p, gn, PI/2);
}
return;
}
case Type::SAME_ORIENTATION: {
for(int i = 0; i < 2; i++) {
Entity *e = SK.GetEntity(i == 0 ? entityA : entityB);
Quaternion q = e->NormalGetNum();
Vector n = q.RotationN().WithMagnitude(25/camera.scale);
Vector u = q.RotationU().WithMagnitude(6/camera.scale);
Vector p = SK.GetEntity(e->point[0])->PointGetNum();
p = p.Plus(n.WithMagnitude(10/camera.scale));
if(refs) refs->push_back(p);
DoLine(canvas, hcs, p.Plus(u), p.Minus(u).Plus(n));
DoLine(canvas, hcs, p.Minus(u), p.Plus(u).Plus(n));
}
return;
}
case Type::EQUAL_ANGLE: {
Vector ref;
Entity *a = SK.GetEntity(entityA);
Entity *b = SK.GetEntity(entityB);
Entity *c = SK.GetEntity(entityC);
Entity *d = SK.GetEntity(entityD);
Vector a0 = a->VectorGetStartPoint();
Vector b0 = b->VectorGetStartPoint();
Vector c0 = c->VectorGetStartPoint();
Vector d0 = d->VectorGetStartPoint();
Vector da = a->VectorGetNum();
Vector db = b->VectorGetNum();
Vector dc = c->VectorGetNum();
Vector dd = d->VectorGetNum();
if(other) {
a0 = a0.Plus(da);
da = da.ScaledBy(-1);
}
DoArcForAngle(canvas, hcs, a0, da, b0, db,
da.WithMagnitude(40/camera.scale), &ref, /*trim=*/false, a->ExplodeOffset());
if(refs) refs->push_back(ref);
DoArcForAngle(canvas, hcs, c0, dc, d0, dd,
dc.WithMagnitude(40/camera.scale), &ref, /*trim=*/false, c->ExplodeOffset());
if(refs) refs->push_back(ref);
return;
}
case Type::ANGLE: {
Entity *a = SK.GetEntity(entityA);
Entity *b = SK.GetEntity(entityB);
Vector a0 = a->VectorGetStartPoint();
Vector b0 = b->VectorGetStartPoint();
Vector da = a->VectorGetNum();
Vector db = b->VectorGetNum();
if(other) {
a0 = a0.Plus(da);
da = da.ScaledBy(-1);
}
Vector ref;
DoArcForAngle(canvas, hcs, a0, da, b0, db, disp.offset, &ref, /*trim=*/true, a->ExplodeOffset());
DoLabel(canvas, hcs, ref, labelPos, gr, gu);
if(refs) refs->push_back(ref);
return;
}
case Type::PERPENDICULAR: {
Vector u = Vector::From(0, 0, 0), v = Vector::From(0, 0, 0);
Vector rn, ru;
if(workplane == Entity::FREE_IN_3D) {
rn = gn;
ru = gu;
} else {
EntityBase *normal = SK.GetEntity(workplane)->Normal();
rn = normal->NormalN();
ru = normal->NormalV(); // ru meaning r_up, not u/v
}
for(int i = 0; i < 2; i++) {
Entity *e = SK.GetEntity(i == 0 ? entityA : entityB);
if(i == 0) {
// Calculate orientation of perpendicular sign only
// once, so that it's the same both times it's drawn
u = e->VectorGetNum();
u = u.WithMagnitude(16/camera.scale);
v = (rn.Cross(u)).WithMagnitude(16/camera.scale);
// a bit of bias to stop it from flickering between the
// two possibilities
if(fabs(u.Dot(ru)) < fabs(v.Dot(ru)) + LENGTH_EPS) {
swap(u, v);
}
if(u.Dot(ru) < 0) u = u.ScaledBy(-1);
}
Vector p = e->VectorGetRefPoint().Plus(e->ExplodeOffset());
Vector s = p.Plus(u).Plus(v);
DoLine(canvas, hcs, s, s.Plus(v));
Vector m = s.Plus(v.ScaledBy(0.5));
DoLine(canvas, hcs, m, m.Plus(u));
if(refs) refs->push_back(m);
}
return;
}
case Type::CURVE_CURVE_TANGENT:
case Type::CUBIC_LINE_TANGENT:
case Type::ARC_LINE_TANGENT: {
Vector textAt, u, v;
if(type == Type::ARC_LINE_TANGENT) {
Entity *arc = SK.GetEntity(entityA);
Entity *norm = SK.GetEntity(arc->normal);
Vector c = SK.GetEntity(arc->point[0])->PointGetDrawNum();
Vector p =
SK.GetEntity(arc->point[other ? 2 : 1])->PointGetDrawNum();
Vector r = p.Minus(c);
textAt = p.Plus(r.WithMagnitude(14/camera.scale));
u = norm->NormalU();
v = norm->NormalV();
} else if(type == Type::CUBIC_LINE_TANGENT) {
Vector n;
if(workplane == Entity::FREE_IN_3D) {
u = gr;
v = gu;
n = gn;
} else {
EntityBase *wn = SK.GetEntity(workplane)->Normal();
u = wn->NormalU();
v = wn->NormalV();
n = wn->NormalN();
}
Entity *cubic = SK.GetEntity(entityA);
Vector p = other ? cubic->CubicGetFinishNum() :
cubic->CubicGetStartNum();
p = p.Plus(cubic->ExplodeOffset());
Vector dir = SK.GetEntity(entityB)->VectorGetNum();
Vector out = n.Cross(dir);
textAt = p.Plus(out.WithMagnitude(14/camera.scale));
} else {
Vector n, dir;
EntityBase *wn = SK.GetEntity(workplane)->Normal();
u = wn->NormalU();
v = wn->NormalV();
n = wn->NormalN();
Entity *eA = SK.GetEntity(entityA);
// Big pain; we have to get a vector tangent to the curve
// at the shared point, which could be from either a cubic
// or an arc.
if(other) {
textAt = eA->EndpointFinish().Plus(eA->ExplodeOffset());
if(eA->type == Entity::Type::CUBIC) {
dir = eA->CubicGetFinishTangentNum();
} else {
dir = SK.GetEntity(eA->point[0])->PointGetNum().Minus(
SK.GetEntity(eA->point[2])->PointGetNum());
dir = n.Cross(dir);
}
} else {
textAt = eA->EndpointStart().Plus(eA->ExplodeOffset());
if(eA->type == Entity::Type::CUBIC) {
dir = eA->CubicGetStartTangentNum();
} else {
dir = SK.GetEntity(eA->point[0])->PointGetNum().Minus(
SK.GetEntity(eA->point[1])->PointGetNum());
dir = n.Cross(dir);
}
}
dir = n.Cross(dir);
textAt = textAt.Plus(dir.WithMagnitude(14/camera.scale));
}
Vector ex = VectorFont::Builtin()->GetExtents(textHeight, "T");
canvas->DrawVectorText("T", textHeight, textAt.Minus(ex.ScaledBy(0.5)),
u.WithMagnitude(1), v.WithMagnitude(1), hcs);
if(refs) refs->push_back(textAt);
return;
}
case Type::PARALLEL: {
for(int i = 0; i < 2; i++) {
Entity *e = SK.GetEntity(i == 0 ? entityA : entityB);
Vector n = e->VectorGetNum();
n = n.WithMagnitude(25/camera.scale);
Vector u = (gn.Cross(n)).WithMagnitude(4/camera.scale);
Vector p = e->VectorGetRefPoint();
if(ShouldDrawExploded()) {
p = p.Plus(e->ExplodeOffset());
}
DoLine(canvas, hcs, p.Plus(u), p.Plus(u).Plus(n));
DoLine(canvas, hcs, p.Minus(u), p.Minus(u).Plus(n));
if(refs) refs->push_back(p.Plus(n.ScaledBy(0.5)));
}
return;
}