void Atom::drawArrow(float length)
{
static GLUquadric* quadric = gluNewQuadric();
static const GLfloat radius(0.04f);
GLfloat coneRadius(3.20f*radius);
GLfloat headLength(1.80f*coneRadius);
GLfloat tubeLength(length-headLength);
glColor4fv(s_vibrationVectorColor);
if (2.0*length < headLength) {
// Zero out very small vectors to tydy things up.
return;
}else if (length < headLength) {
coneRadius *= length/headLength;
headLength = length;
tubeLength = 0.0f;
}else {
// Only Vectors longer than headLength have a tube.
gluQuadricOrientation(quadric, GLU_OUTSIDE);
gluCylinder(quadric, radius, radius, tubeLength, Primitive::s_resolution, 1);
gluQuadricOrientation(quadric, GLU_INSIDE);
gluDisk(quadric, 0.0, radius, Primitive::s_resolution, 1);
}
glTranslatef(0.0, 0.0, tubeLength);
gluQuadricOrientation(quadric, GLU_OUTSIDE);
gluCylinder(quadric, coneRadius, 0.0, headLength, Primitive::s_resolution, 1);
gluQuadricOrientation(quadric, GLU_INSIDE);
gluDisk(quadric, 0.0, coneRadius, Primitive::s_resolution, 1);
}
bool ArrowMarker::eventFilter(QObject *, QEvent *e)
{
switch(e->type()) {
case QEvent::MouseButtonPress:
{
const QMouseEvent *me = (const QMouseEvent *)e;
if (me->button() != Qt::LeftButton)
return false;
QRect handler = QRect (QPoint(0,0), QSize(10, 10));
handler.moveCenter (startPoint());
if (handler.contains(me->pos()))
{
QApplication::setOverrideCursor(QCursor(Qt::SizeAllCursor), true);
d_op = MoveStart;
return true;
}
handler.moveCenter (endPoint());
if (handler.contains(me->pos()))
{
QApplication::setOverrideCursor(QCursor(Qt::SizeAllCursor), true);
d_op = MoveEnd;
return true;
}
int d = qRound(width() + (int)floor(headLength()*tan(M_PI*headAngle()/180.0) + 0.5));
if (dist(me->pos().x(),me->pos().y()) <= d)
{
QApplication::setOverrideCursor(QCursor(Qt::SizeAllCursor), true);
d_op = MoveBoth;
d_op_startat = me->pos()-startPoint();
return true;
}
return false;
}
case QEvent::MouseMove:
{
const QMouseEvent *me = (const QMouseEvent *)e;
switch(d_op) {
case MoveStart:
setStartPoint(me->pos());
plot()->replot();
return true;
case MoveEnd:
setEndPoint(me->pos());
plot()->replot();
return true;
case MoveBoth:
setEndPoint(endPoint()+me->pos()-d_op_startat-startPoint());
setStartPoint(me->pos()-d_op_startat);
plot()->replot();
return true;
default:
return false;
}
}
case QEvent::MouseButtonRelease:
{
const QMouseEvent *me = (const QMouseEvent *)e;
switch(d_op) {
case MoveStart:
setStartPoint(me->pos());
plot()->replot();
d_op = None;
QApplication::restoreOverrideCursor();
return true;
case MoveEnd:
setEndPoint(me->pos());
plot()->replot();
d_op = None;
QApplication::restoreOverrideCursor();
return true;
case MoveBoth:
setXValue(plot()->invTransform(xAxis(), me->pos().x()-d_op_startat.x()));
setYValue(plot()->invTransform(yAxis(), me->pos().y()-d_op_startat.y()));
plot()->replot();
d_op = None;
QApplication::restoreOverrideCursor();
return true;
default:
d_op = None;
QApplication::restoreOverrideCursor();
return false;
}
}
case QEvent::MouseButtonDblClick:
{
const QMouseEvent *me = (const QMouseEvent *)e;
if (me->button() != Qt::LeftButton)
return false;
LineDialog *ld = new LineDialog(this, plot()->window());
ld->exec();
return true;
}
default:
return false;
}
}