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Reverse arrows on an angle constraint when the label is outside.

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EvilSpirit 2016-04-16 17:58:23 +06:00 committed by whitequark
parent 3b7e7289c8
commit a4a353f01b
1 changed files with 39 additions and 20 deletions
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59
src/drawconstraint.cpp
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@ -378,8 +378,24 @@ void Constraint::DoArcForAngle(Vector a0, Vector da, Vector b0, Vector db,
double textR = sqrt(swidth * swidth + sheight * sheight) / 2.0;
*ref = pi.Plus(rm.WithMagnitude(std::max(rm.Magnitude(), 15 * px + textR)));
// Additional extension angle
// 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 * px;
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 * px / 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.
@ -387,29 +403,36 @@ void Constraint::DoArcForAngle(Vector a0, Vector da, Vector b0, Vector db,
// 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 = acos(rmp.Dot(db));
}
addAngle = std::max(acos(rmp.Dot(db)), extAngle);
Vector ru = da;
Vector rv = dna;
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);
ru = rmp;
rv = norm.Cross(ru).WithMagnitude(1.0);
// rmp and da magnitudes are 1.0
addAngle = acos(rmp.Dot(da));
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 = (i*(thetaf + addAngle))/n;
Vector p = ru.ScaledBy(r*cos(theta)).Plus(
rv.ScaledBy(r*sin(theta))).Plus(pi);
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(*ref, prev, p, false, gr, gu, swidth, sheight);
@ -420,20 +443,16 @@ void Constraint::DoArcForAngle(Vector a0, Vector da, Vector b0, Vector db,
prev = p;
}
// Arrow points
Vector apa = da. ScaledBy(r).Plus(pi);
Vector apb = da. ScaledBy(r*cos(thetaf)).Plus(
dna.ScaledBy(r*sin(thetaf))).Plus(pi);
DoLineExtend(a0, a1, apa, 5.0 * px);
DoLineExtend(b0, b1, apb, 5.0 * px);
double arrowW = 13 * px;
double arrowA = 18.0 * PI / 180.0;
// Draw arrows only when we have enough space.
if(apb.Minus(apa).Magnitude() > 2.5 * arrowW) {
if(arrowVisible) {
double angleCorr = arrowW / (2.0 * r);
if(arrowRev) {
dna = dna.ScaledBy(-1.0);
angleCorr = -angleCorr;
}
DoArrow(apa, dna, norm, arrowW, arrowA, angleCorr);
DoArrow(apb, dna, norm, arrowW, arrowA, thetaf + PI - angleCorr);
}