void MainWindow::slotAddPolygonItem() //在场景中加入一个多边形图元
{
QVector<QPoint> v;
v<<QPoint(30,-15)<<QPoint(0,-30)<<QPoint(-30,-15)<<QPoint(-30,15)<<QPoint(0,30)<<QPoint(30,15);
QGraphicsPolygonItem *item = new QGraphicsPolygonItem(QPolygonF(v));
item->setBrush(QColor(qrand()%256,qrand()%256,qrand()%256));
item->setFlag(QGraphicsItem::ItemIsMovable);
scene->addItem(item);
item->setPos((qrand()%int(scene->sceneRect().width()))-200,(qrand()%int(scene->sceneRect().height()))-200);
}
void Main::addPolygon()
{
const int size = int(canvas.width()/2);
Q3PointArray pa(6);
pa[0] = QPoint(0,0);
pa[1] = QPoint(size,size/5);
pa[2] = QPoint(size*4/5,size);
pa[3] = QPoint(size/6,size*5/4);
pa[4] = QPoint(size*3/4,size*3/4);
pa[5] = QPoint(size*3/4,size/4);
QGraphicsPolygonItem* i = canvas.addPolygon(pa);
i->setFlag(QGraphicsItem::ItemIsMovable);
i->setPen(Qt::NoPen);
i->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
i->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
i->setZValue(qrand()%256);
}
void FormView::showSetting(Setting setting)
{
QGraphicsScene *s = scene();
s->clear();
resetTransform();
int scale_fac = 10;
int spacing = 20;
int planeWidth = setting.get_problem()->get_plane_width()*scale_fac;
int planeHeight = setting.get_problem()->get_plane_height()*scale_fac;
QRectF bound;
for (int i=0; i<setting.get_number_of_planes(); ++i)
{
int x_offset = i*(planeWidth+spacing)+(spacing/2);
int y_offset = (spacing/2);
QRectF plane(x_offset,y_offset,planeWidth, planeHeight);
s->addRect(plane,QPen(), QBrush(QColor(188, 198, 204),Qt::SolidPattern));
for (int j=0; j<setting.get_plane_at(i)->get_number_of_forms(); ++j)
{
QPolygonF polygon;
Form form;
setting.get_plane_at(i)->get_form_at(j, form);
vector<Point> points_of_current_form = *(form.get_points());
for (int k=0; k<points_of_current_form.size(); ++k){
Point point = points_of_current_form[k];
polygon.push_back(QPointF(point.get_x()*scale_fac, point.get_y()*scale_fac));
}
QGraphicsPolygonItem * polyitem = s->addPolygon(polygon, QPen(QColor(Qt::red)), QBrush(Qt::SolidPattern));
polyitem->setPos(x_offset, y_offset);
bound = polygon.boundingRect();
}
}
float realwidth = container->width() - 50;
float width = setting.get_number_of_planes()*(planeWidth+spacing);
float realheight = container->height() - 50;
float height = planeHeight+spacing;
s->setSceneRect(0,0,width,height);
float relw = 1;
if(width > 0){
relw = realwidth / width;
}
float relh = 1;
if(height > 0){
relh = realheight / height;
}
float rel = relw;
if(relh < relw){
rel = relh;
}
scale(rel,rel);
}