/**
* Find the line of \a poly with the smallest or largest value (controlled by \a seek)
* along the axis controlled by \a axis.
* In case \a axis is X, do not consider lines whose Y values lie outside the Y values
* defined by \a boundingRect.
* In case \a axis is Y, do not consider lines whose X values lie outside the X values
* defined by \a boundingRect.
*/
QLineF findLine(const QPolygonF& poly, Axis_Type axis, Comparison_Type seek, const QRectF& boundingRect)
{
const int lastIndex = poly.size() - 1 - (int)poly.isClosed();
QPointF prev = poly.at(lastIndex), curr;
QPointF p1(seek == Smallest ? QPointF(1.0e6, 1.0e6) : QPointF(-1.0e6, -1.0e6));
QPointF p2;
for (int i = 0; i <= lastIndex; i++) {
curr = poly.at(i);
// uDebug() << " poly[" << i << "] = " << curr;
if (axis == X) {
if (fmin(prev.y(), curr.y()) > boundingRect.y() + boundingRect.height() ||
fmax(prev.y(), curr.y()) < boundingRect.y()) {
// line is outside Y-axis range defined by boundingRect
} else if ((seek == Smallest && curr.x() <= p1.x()) ||
(seek == Largest && curr.x() >= p1.x())) {
p1 = curr;
p2 = prev;
}
} else {
if (fmin(prev.x(), curr.x()) > boundingRect.x() + boundingRect.width() ||
fmax(prev.x(), curr.x()) < boundingRect.x()) {
// line is outside X-axis range defined by boundingRect
} else if ((seek == Smallest && curr.y() <= p1.y()) ||
(seek == Largest && curr.y() >= p1.y())) {
p1 = curr;
p2 = prev;
}
}
prev = curr;
}
return QLineF(p1, p2);
}
/**
* Return the point in \a poly which follows the point at index \a index.
* If \a index is the last index then return the first (or, if
* \a poly.isClosed() is true, the second) point.
*/
QPointF nextPoint(int index, const QPolygonF& poly) {
if (poly.size() < 3 || index >= poly.size())
return QPoint();
if (index == poly.size() - 1)
return poly.at((int)poly.isClosed());
return poly.at(index + 1);
}
/**
* Return the point in \a poly which precedes the point at index \a index.
* If \a index is 0 then return the last (or, if \a poly.isClosed() is
* true, the second to last) point.
*/
QPointF prevPoint(int index, const QPolygonF& poly) {
if (poly.size() < 3 || index >= poly.size())
return QPoint();
if (index == 0)
return poly.at(poly.size() - 1 - (int)poly.isClosed());
return poly.at(index - 1);
}
QPointF Meshing::addMiddlePoint(int id)
{
QPointF point(0,0);
QPolygonF poly = mesh_.at(id);
if(poly.isEmpty())
return point;
if(!poly.isClosed())
poly << poly.at(0);
mesh_.removeAt(id);
for(int i=0;i<poly.size()-1;i++)
point += poly.at(i);
point /= (double)(poly.size()-1);
/*while(!poly.containsPoint(point,Qt::WindingFill)){
point += QPointF(-50+rand()%100,-50+rand()%100);
}*/
for(int i=0;i<poly.size()-1;i++){
QPolygonF p;
p << poly.at(i) << poly.at(i+1) << point << poly.at(i);
mesh_.push_back(p);
}
return point;
}
QPolygonF Segmenter::makeSegmentFromDivs(const QPolygonF &start, const QPolygonF &end) const
{
QPolygonF area;
area << start[0];
area += end;
for (int i = start.size() - 1; i > -1 ; i--)
area << start[i];
Q_ASSERT_X(area.isClosed(), "makeSegmentFromDivs", "area is not closed");
return area;
}
QString QTikzPicturePrivate::toTikzPath(const QPolygonF & polygon) const
{
if (polygon.isEmpty()) return QString();
const int end = polygon.size() - polygon.isClosed() ? 1 : 0;
QString path;
for (int i = 0; i < end; ++i) {
if (i == 0) {
path = toCoord(polygon[i]);
} else if (i == end - 1) {
path += " -- cycle";
} else {
path += " -- " + toCoord(polygon[i]);
}
}
return path;
}
/**
* Determine the approximate closest points of two polygons.
* @param self First QPolygonF.
* @param other Second QPolygonF.
* @return QLineF::p1() returns point of \a self;
* QLineF::p2() returns point of \a other.
*/
QLineF closestPoints(const QPolygonF& self, const QPolygonF& other)
{
const QRectF& selfRect = self.boundingRect();
const QRectF& otherRect = other.boundingRect();
Uml::Region::Enum region = findRegion(selfRect, otherRect);
if (region == Uml::Region::Center)
return QLineF();
if (self.size() < 3 || other.size() < 3)
return QLineF();
QLineF result;
const int selfLastIndex = self.size() - 1 - (int)self.isClosed();
const int otherLastIndex = other.size() - 1 - (int)other.isClosed();
QPointF selfPoint(self.at(selfLastIndex));
QPointF otherPoint(other.at(otherLastIndex));
QLineF selfLine, otherLine;
int i;
switch (region) {
case Uml::Region::North:
// Find other's line with largest Y values
otherLine = findLine(other, Y, Largest, selfRect);
// Find own line with smallest Y values
selfLine = findLine(self, Y, Smallest, otherRect);
// Use the middle value of the X values
result.setLine(middle(selfLine.p2().x(), selfLine.p1().x()), selfLine.p1().y(),
middle(otherLine.p2().x(), otherLine.p1().x()), otherLine.p1().y());
break;
case Uml::Region::South:
// Find other's line with smallest Y values
otherLine = findLine(other, Y, Smallest, selfRect);
// Find own line with largest Y values
selfLine = findLine(self, Y, Largest, otherRect);
// Use the middle value of the X values
result.setLine(middle(selfLine.p2().x(), selfLine.p1().x()), selfLine.p1().y(),
middle(otherLine.p2().x(), otherLine.p1().x()), otherLine.p1().y());
break;
case Uml::Region::West:
// Find other's line with largest X values
otherLine = findLine(other, X, Largest, selfRect);
// Find own line with smallest X values
selfLine = findLine(self, X, Smallest, otherRect);
// Use the middle value of the Y values
result.setLine(selfLine.p1().x(), middle(selfLine.p2().y(), selfLine.p1().y()),
otherLine.p1().x(), middle(otherLine.p2().y(), otherLine.p1().y()));
break;
case Uml::Region::East:
// Find other's line with smallest X values
otherLine = findLine(other, X, Smallest, selfRect);
// Find own line with largest X values
selfLine = findLine(self, X, Largest, otherRect);
// Use the middle value of the Y values
result.setLine(selfLine.p1().x(), middle(selfLine.p2().y(), selfLine.p1().y()),
otherLine.p1().x(), middle(otherLine.p2().y(), otherLine.p1().y()));
break;
case Uml::Region::NorthWest:
// Find other's point with largest X and largest Y value
for (i = 0; i < otherLastIndex; ++i) {
QPointF current(other.at(i));
if (current.x() + current.y() >= otherPoint.x() + otherPoint.y()) {
otherPoint = current;
}
}
// Find own point with smallest X and smallest Y value
for (i = 0; i < selfLastIndex; ++i) {
QPointF current(self.at(i));
if (current.x() + current.y() <= selfPoint.x() + selfPoint.y()) {
selfPoint = current;
}
}
result.setPoints(selfPoint, otherPoint);
break;
case Uml::Region::SouthWest:
// Find other's point with largest X and smallest Y value
for (i = 0; i < otherLastIndex; ++i) {
QPointF current(other.at(i));
if (current.x() >= otherPoint.x() && current.y() <= otherPoint.y()) {
otherPoint = current;
}
}
// Find own point with smallest X and largest Y value
for (i = 0; i < selfLastIndex; ++i) {
QPointF current(self.at(i));
if (current.x() <= selfPoint.x() && current.y() >= selfPoint.y()) {
selfPoint = current;
}
}
result.setPoints(selfPoint, otherPoint);
break;
case Uml::Region::NorthEast:
// Find other's point with smallest X and largest Y value
for (i = 0; i < otherLastIndex; ++i) {
QPointF current(other.at(i));
if (current.x() <= otherPoint.x() && current.y() >= otherPoint.y()) {
otherPoint = current;
}
}
// Find own point with largest X and smallest Y value
for (i = 0; i < selfLastIndex; ++i) {
QPointF current(self.at(i));
if (current.x() >= selfPoint.x() && current.y() <= selfPoint.y()) {
selfPoint = current;
}
}
result.setPoints(selfPoint, otherPoint);
break;
case Uml::Region::SouthEast:
// Find other's point with smallest X and smallest Y value
for (i = 0; i < otherLastIndex; ++i) {
QPointF current(other.at(i));
if (current.x() + current.y() <= otherPoint.x() + otherPoint.y()) {
otherPoint = current;
}
}
// Find own point with largest X and largest Y value
for (i = 0; i < selfLastIndex; ++i) {
QPointF current(self.at(i));
if (current.x() + current.y() >= selfPoint.x() + selfPoint.y()) {
selfPoint = current;
}
}
result.setPoints(selfPoint, otherPoint);
break;
default:
// Error
break;
}
return result;
}
void Meshing::splitDiag()
{
for(int id=0;id<mesh_.size();id++){
QPolygonF poly = mesh_.at(id);
if(poly.isEmpty())
continue;
if(!poly.isClosed())
poly << poly.at(0);
if(poly.size()<=4)
continue;
QStringList polyID;
for(int k=0;k<poly.size();k++)
polyID << findID(poly.at(k));
/*for(int i=0;i<poly.size()-2;i++){
QPointF p = (poly.at(i) + poly.at(i+2))/2.0;
if(poly.containsPoint(p,Qt::WindingFill)){
QPolygonF p1,p2;
for(int k=i;k<i+3;k++){
p1 << poly.at(k);
}
p1 << poly.at(i);
for(int k=i+3;k<=poly.size()-1;k++){
p2 << poly.at(k);
}
for(int k=0;k<i;k++){
p2 << poly.at(k);
}
p2 << poly.at(i);
mesh_.push_back(p1);
mesh_.push_back(p2);
mesh_.removeAt(id);
splitDiag();
return;
}
}*/
//qDebug() << "Split poly" << polyID;
for(int i=0;i<poly.size()-1;i++){
for(int j=i+2;j<poly.size()-(i==0?2:1);j++){
//qDebug() << "Try to split along" << findID(poly.at(i)) << findID(poly.at(j));
QLineF line(poly.at(i),poly.at(j));
QPointF middle = (poly.at(i)+poly.at(j))/2.0;
if(!poly.containsPoint(middle,Qt::WindingFill))
continue;
if(!intersects(poly,line)){
QPolygonF p1,p2;
//QStringList poly1id,poly2id;
for(int k=i;k<=j;k++){
p1 << poly.at(k);
//poly1id << findID(poly.at(k));
}
p1 << poly.at(i);
//poly1id << findID(poly.at(i));
for(int k=j;k<poly.size()-1;k++){
p2 << poly.at(k);
//poly2id << findID(poly.at(k));
}
for(int k=0;k<=i;k++){
p2 << poly.at(k);
//poly2id << findID(poly.at(k));
}
p2 << poly.at(j);
//poly2id << findID(poly.at(j));
//qDebug() << poly.size() << QPair<int,QString>(i,findID(poly.at(i))) << QPair<int,QString>(j,findID(poly.at(j))) << p1.size() << p2.size();
//qDebug() << "Poly1" << poly1id;
//qDebug() << "Poly2" << poly2id;
mesh_.push_back(p1);
mesh_.push_back(p2);
mesh_.removeAt(id);
splitDiag();
return;
}
}
}
//qDebug() << "Can't split poly " << polyID;
}
}
