traceType Arc2D::arcLength() const {
validate();
LOG_DEBUG("Startpoint x,y: " << m_firstPoint.x << ", " << m_firstPoint.y);
LOG_DEBUG("Endpoint x,y: " << m_secondPoint.x << ", " << m_secondPoint.y);
LOG_DEBUG("is clockwise : " << m_isClockwise);
LOG_DEBUG("Magnitude is: " << radius());
traceType angle = spanAngle();
return angle * radius();
}
void paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget) {
painter->setPen(pen());
painter->setBrush(brush());
painter->drawArc(rect(), startAngle(), spanAngle());
// fix me, need to adjust the rect size so that it's only as big as the arc
// if (option->state & QStyle::State_Selected)
// qt_graphicsItem_highlightSelected(this, painter, option);
}
bool Arc2D::isPointOnArcWithDifferentQuadrant(const Quadrant2D& firstQuadrant,
const Quadrant2D& secondQuadrant,
const Quadrant2D& requestedQuadrant) const{
bool shouldIncrement(PI/2 < spanAngle());
Quadrant2D quadrant = firstQuadrant;
while (shouldIncrement || (quadrant!= secondQuadrant)) {
shouldIncrement = false;
if (quadrant == requestedQuadrant) {
return true;
}
quadrant.increment(m_isClockwise);
}
return false;
}
bool Arc2D::isPointOnArcWithEqualQuadrant(const Point2D& firstPoint,
const Point2D& requestedPoint,
const bool& i_isClockwise) const {
// it is in the same quadrant so we can do
traceType firstPointAlpha(firstPoint.getAlpha());
traceType requestedPointAlpha(requestedPoint.getAlpha());
traceType spannedAngle(spanAngle());
if (!i_isClockwise) {
if (firstPointAlpha < requestedPointAlpha) {
if ((firstPointAlpha + spannedAngle) > requestedPointAlpha) {
return true;
}
}
} else { // clockwise
if (firstPointAlpha > requestedPointAlpha) {
if ((firstPointAlpha - spannedAngle) < requestedPointAlpha) {
return true;
}
}
}
return false;
}
int QElipseItem::GetSpanAngle() //获得跨度角度值
{
int nspanAngle=spanAngle();
return nspanAngle/16;
}
