Adesk::Boolean AsdkEmployee::worldDraw(AcGiWorldDraw* mode)
{
assertReadEnabled();
// TODO: implement this function.
//----- Draw the entity
AcDbEllipse::worldDraw (mode) ;
//----- Write the Employee ID and Name
char buffer [255] ;
sprintf (buffer, "%d (cube#: %d)", m_ID, m_cube) ;
mode->geometry ().text (center (), normal (), majorAxis (), minorAxis ().length () / 2, 1.0, 0.0, buffer) ;
sprintf (buffer, "%s %s", m_firstName, m_lastName) ;
mode->geometry ().text (center () - minorAxis () / 2, normal (), majorAxis (), minorAxis ().length () / 2, 1.0, 0.0, buffer) ;
//----- Returns Adesk::kTrue to not call viewportDraw()
return (Adesk::kTrue) ;
}
QList<RLine> REllipse::getTangents(const RVector& point) const {
QList<RLine> ret;
if (getDistanceTo(point, false) < RS::PointTolerance) {
// point is on ellipse:
return ret;
}
// point is at center (prevents recursion when swapping ellipse minor / major):
if (point.getDistanceTo(getCenter())<RS::PointTolerance) {
return ret;
}
// swap ellipse minor / major if point is on minor axis
// 20120928: and not also on major axis (prevent recursion):
RLine minorAxis(getCenter(), getCenter() + getMinorPoint());
RLine majorAxis(getCenter(), getCenter() + getMajorPoint());
if (minorAxis.isOnShape(point, false) && !majorAxis.isOnShape(point, false)) {
REllipse e2 =*this;
e2.majorPoint = getMinorPoint();
e2.ratio = 1.0/ratio;
return e2.getTangents(point);
}
double a = getMajorRadius(); // the length of the major axis / 2
double b = getMinorRadius(); // the length of the minor axis / 2
// rotate and move point:
RVector point2 = point;
point2.move(-getCenter());
point2.rotate(-getAngle());
double xp = point2.x; // coordinates of the given point
double yp = point2.y;
double xt1; // Tangent point 1
double yt1;
double xt2; // Tangent point 2
double yt2;
double a2 = a * a;
double b2 = b * b;
double d = a2 / b2 * yp / xp;
double e = a2 / xp;
double af = b2 * d * d + a2;
double bf = -b2 * d * e * 2.0;
double cf = b2 * e * e - a2 * b2;
double t = sqrt(bf * bf - af * cf * 4.0);
if (RMath::isNaN(t)) {
return ret;
}
yt1 = (t - bf) / (af * 2.0);
xt1 = e - d * yt1;
yt2 = (-t - bf) / (af * 2.0);
xt2 = e - d * yt2;
RVector s1(xt1, yt1);
s1.rotate(getAngle());
s1.move(getCenter());
RVector s2(xt2, yt2);
s2.rotate(getAngle());
s2.move(getCenter());
if (s1.isValid()) {
ret.append(RLine(point, s1));
}
if (s2.isValid()) {
ret.append(RLine(point, s2));
}
return ret;
}
