C++ QPolygon类代码示例

void MainWindow::enableMask(bool enable)
{
    if (!enable || Colors::noWindowMask)
        this->clearMask();
    else {
        QPolygon region;
        region.setPoints(9,
                                // north side:
                                0, 0,
                                800, 0,
                                // east side:
                                // 800, 70,
                                // 790, 90,
                                // 790, 480,
                                // 800, 500,
                                800, 600,
                                // south side:
                                700, 600,
                                670, 590,
                                130, 590,
                                100, 600,
                                0, 600,
                                // west side:
                                // 0, 550,
                                // 10, 530,
                                // 10, 520,
                                // 0, 520,
                                0, 0);
        this->setMask(QRegion(region));
    }
}

QPolygon drawerQt::polygonQt( const std::vector<scigraphics::wpoint> &Points )
{
  QPolygon Polygon;
  for ( unsigned i = 0; i < Points.size(); i++ )
    Polygon.append( pointQt( Points[i] ) );
  return Polygon;
}

vector<int> PerimeterWindow::boundaryFromPolygon(QPolygon poly, int xo, int yo, int gw){
    // not sure of the best way of doing this, but lets have a go..
    vector<int> points;
    if(poly.size() < 2){
	cerr << "PerimeterWindow::boundaryFromPolygon, points is too small (less than 2) " << poly.size() << endl;
	return(points);
    }
    for(uint i=1; i < poly.size(); i++){   
	// Fill in the points from i-1 to i
	QPoint p1 = poly[i-1];
	QPoint p2 = poly[i];
//	points.push_back((p1.y() + yo) * gw + p1.x() + xo);
	// then work out how to get the other points..
	int dx = p2.x() - p1.x();
	int dy = p2.y() - p1.y();
	int stepNo = abs(dx) > abs(dy) ? abs(dx) : abs(dy);  
        // in the funny world of pixels a diagonal is only as long as the longer side..
	for(int i=0; i < stepNo; i++){
	    int lx = p1.x() + (i * dx)/stepNo;
	    int ly = p1.y() + (i * dy)/stepNo;
	    // then convert and push back..
	    points.push_back((ly + yo) * gw + lx + xo);
	}
    }
    // but at this point we have not added the last point so we need to do that..
    QPoint p = poly.back();
    points.push_back( (p.y() + yo) * gw + p.x() + xo);
    return(points);
}

QPolygon &RegionMask::Mask2QPolygon(const cv::Mat &img, QPolygon &poly, QList<QPolygon> &holes) {
    poly.clear();
    vector<vector<cv::Point> > contours;
    vector<cv::Vec4i> hierarchy;
    cv::findContours(img.clone(), contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_TC89_KCOS, cv::Point(0, 0));

    //assert(contours.size() > 0);

    if (contours.size() > 0) {
        for (unsigned int i = 0; i < contours[0].size(); i++) {
            poly.append(QPoint(contours[0][i].x, contours[0][i].y));
        }

        int idHole = hierarchy[0][2];
        for (; idHole != -1; idHole = hierarchy[idHole][0]) {
            QPolygon pnew;
            for (unsigned int i = 0; i < contours[idHole].size(); i++) {
                pnew.append(QPoint(contours[idHole][i].x, contours[idHole][i].y));
            }
            holes.append(pnew);
        }
    }

    return poly;
}

void KoContextHelpPopup::resizeEvent( QResizeEvent* )
{
	QBitmap mask( width(), height() );
	QPolygon a;
	QPainter p( &mask );
	p.fillRect( 0, 0, width(), height(), Qt::color1 );
	p.setPen( Qt::color0 );
	p.setBrush( Qt::color0 );
	p.drawLine( 0, 0, 0, 3 );
	p.drawLine( 0, 0, 3, 0 );
	p.drawPoint( 1, 1 );
	a.setPoints( 3, 0, height() - 5, 4, height() - 1, 0, height() - 1 );
	p.drawPolygon( a );
	a.setPoints( 3, width() - 5, 0, width() - 1, 4, width() - 1, 0 );
	p.drawPolygon( a );
	p.drawLine( width() - 1, height() - 1, width() - 4, height() - 1 );
	p.drawLine( width() - 1, height() - 1, width() - 1, height() - 4 );
	p.drawPoint( width() - 2, height() - 2 );
	p.drawPoint( 0, height() - 6 );
	p.drawPoint( width() - 6, 0 );
	p.drawPoint( width() - 5, height() - 3 );
	p.drawPoint( width() - 3, height() - 5 );
	p.setPen( Qt::NoPen );
	p.setBrush( QBrush( Qt::color0, Qt::Dense4Pattern ) );
	p.drawRect( 0, height() - 2, width() - 1, height() - 1 );
	p.drawRect( width() - 2, 0, width() - 1, height() - 1 );
	p.drawRect( width() - 4, height() - 4, width() - 2, height() - 2 );
	p.end();
	setMask( QRegion( mask ) );
} // KoContextHelpPopup::resizeEvent

Area Area::fromString(const QString& str)
{
  Area result;
  QStringList list = str.split(',', QString::SkipEmptyParts);
  if (list.isEmpty())
    return result;
  AreaTypeFlag type = (AreaTypeFlag) list.takeFirst().toInt();
  switch (type)
  {
  case TypeRectangle:
    if (list.size() != 4)
      break;
    {
      int values[4];
      values[0] = list.takeFirst().toInt();
      values[1] = list.takeFirst().toInt();
      values[2] = list.takeFirst().toInt();
      values[3] = list.takeFirst().toInt();
      result = Area(QRect(values[0],
                          values[1],
                          values[2],
                          values[3]));
    }
    break;
  case TypePolygon:
    {
      int size = list.takeFirst().toInt();
      if (list.size() != 2 * size)
        break;
      QPolygon poly;
      for (int i = 0;i < size;++i)
      {
        int values[2];
        values[0] = list.takeFirst().toInt();
        values[1] = list.takeFirst().toInt();
        poly.append(QPoint(values[0], values[1]));
      }
      result = Area(poly);
    }
    break;
  case TypeEllipse:
    if (list.size() != 4)
      break;
    {
      int values[4];
      values[0] = list.takeFirst().toInt();
      values[1] = list.takeFirst().toInt();
      values[2] = list.takeFirst().toInt();
      values[3] = list.takeFirst().toInt();
      result = Area(Ellipse(QPoint(values[0],
                                   values[1]),
                            values[2],
                            values[3]));
    }
    break;
  default:
    break;
  }
  return result;
}

QSize KDChart::TextLayoutItem::calcSizeHint(
        QFont fnt, QPoint& topLeftPt, QPoint& topRightPt, QPoint& bottomRightPt, QPoint& bottomLeftPt ) const
{
    const QSize siz( unrotatedSizeHint( fnt ));
    //qDebug() << "-------- siz: "<<siz;
    if( ! mAttributes.rotation() ){
        topLeftPt     = QPoint(0,0);
        topRightPt    = QPoint(siz.width(),0);
        bottomRightPt = QPoint(siz.width(),siz.height());
        bottomLeftPt  = QPoint(0,siz.height());
        return siz;
    }

    const QRect rect(QPoint(0, 0), siz + QSize(4,4));
    const qreal angle = PI * mAttributes.rotation() / 180.0;
    const qreal cosAngle = cos( angle );
    const qreal sinAngle = sin( angle );
    QMatrix rotationMatrix(cosAngle, sinAngle, -sinAngle, cosAngle, 0, 0);
    QPolygon rotPts;
    rotPts << rotationMatrix.map(rect.topLeft())
           << rotationMatrix.map(rect.topRight())
           << rotationMatrix.map(rect.bottomRight())
           << rotationMatrix.map(rect.bottomLeft());
    QSize rotSiz( rotPts.boundingRect().size() );
    //qDebug() << "-------- KDChart::TextLayoutItem::calcSizeHint() returns:"<<rotSiz<<rotPts;
    topLeftPt     = rotPts[0];
    topRightPt    = rotPts[1];
    bottomRightPt = rotPts[2];
    bottomLeftPt  = rotPts[3];
    return rotSiz;
}

//virtual
bool
Zoomer::accept( QPolygon &pa ) const
{
    if ( pa.count() < 2 )
        return false;
  
    QRect rect = QRect( pa[0], pa[int( pa.count() ) - 1] );
    rect = rect.normalized();
  
    if ( rect.width() < 2 && rect.height() < 2 )
        return false;
    pa.resize( 2 );

    const QRectF& rc = pickArea().boundingRect(); // view rect
    if ( rect.width() < minX ) {
        // make a virtical line
        pa[ 0 ] = QPoint( rc.left(), rect.top() );
        pa[ 1 ] = QPoint( rc.right(), rect.bottom() );
        return true;
    } else if ( rect.height() < minY ) {
        // make a horizontal line
        pa[ 0 ] = QPoint( rect.left(), rc.top() );
        pa[ 1 ] = QPoint( rect.right(), rc.bottom() );
    } else {
        pa[ 0 ] = rect.topLeft();
        pa[ 1 ] = rect.bottomRight();
    }
    return true;
}

QRectF rotatedRect( const QRectF& oldRect, qreal angleInt, const QPointF& center )
{
    const QRect rect( oldRect.translated( center ).toRect() );
    const qreal angle = PI * angleInt / 180.0;
    const qreal cosAngle = cos( angle );
    const qreal sinAngle = sin( angle );
    QMatrix rotationMatrix(cosAngle, sinAngle, -sinAngle, cosAngle, 0, 0);
    QPolygon rotPts;
    rotPts <<  rotationMatrix.map(rect.topLeft()) //QPoint(0,0)
            << rotationMatrix.map(rect.topRight())
            << rotationMatrix.map(rect.bottomRight())
            << rotationMatrix.map(rect.bottomLeft());
            //<< rotatedPoint(rect.topRight(), angleInt, center).toPoint()
            //<< rotatedPoint(rect.bottomRight(), angleInt, center).toPoint()
            //<< rotatedPoint(rect.bottomLeft(), angleInt, center).toPoint();
    return rotPts.boundingRect();
/*
    const QPointF topLeft( rotatedPoint( oldRect.topLeft(), angle, center ) );
    const QPointF topRight( rotatedPoint( oldRect.topRight(), angle, center ) );
    const QPointF bottomLeft( rotatedPoint( oldRect.bottomLeft(), angle, center ) );
    const QPointF bottomRight( rotatedPoint( oldRect.bottomRight(), angle, center ) );

    const qreal x = qMin( qMin( topLeft.x(), topRight.x() ), qMin( bottomLeft.x(), topLeft.x() ) );
    const qreal y = qMin( qMin( topLeft.y(), topRight.y() ), qMin( bottomLeft.y(), topLeft.y() ) );
    const qreal width = qMax( qMax( topLeft.x(), topRight.x() ), qMax( bottomLeft.x(), topLeft.x() ) ) - x;
    const qreal height = qMax( qMax( topLeft.y(), topRight.y() ), qMax( bottomLeft.y(), topLeft.y() ) ) - y;

    return QRectF( x, y, width, height );
*/
}

void TupLuminancePicker::paintEvent(QPaintEvent *)
{
    int w = width() - 5;

    QRect r(0, foff, w, height() - 2*foff);
    int wi = r.width() - 2;
    int hi = r.height() - 2;
    if (!k->pix || k->pix->height() != hi || k->pix->width() != wi) {
        delete k->pix;
        QImage img(wi, hi, QImage::Format_RGB32);
        int y;
        for (y = 0; y < hi; y++) {
             QColor c;
             c.setHsv(k->hue, k->sat, y2val(y+coff));
             QRgb r = c.rgb();
             int x;
             for (x = 0; x < wi; x++)
                  img.setPixel(x, y, r);
        }
        k->pix = new QPixmap(QPixmap::fromImage(img));
    }

    QPainter p(this);
    p.drawPixmap(1, coff, *k->pix);
    const QPalette &g = palette();
    qDrawShadePanel(&p, r, g, true);
    p.setPen(g.foreground().color());
    p.setBrush(g.foreground());
    QPolygon a;
    int y = val2y(k->value);
    a.setPoints(3, w, y, w+5, y+5, w+5, y-5);
    p.eraseRect(w, 0, 5, height());
    p.drawPolygon(a);
}

// The new function using fixed point multiplication
QPolygon MapMatrix::map(const QPolygon &a) const
{
  int size = a.size();
  int64_t fx;
  int64_t fy;
  int32_t curx;
  int32_t cury;
  int32_t lastx = 0;
  int32_t lasty = 0;

  QPolygon p;

  for( int i = 0; i < size; i++ )
    {
      a.point(i, &curx, &cury);
      fx = itofp24p8( curx );
      fy = itofp24p8( cury );
      // some cheating involved; multiplication with the "wrong" macro
      // after "left shifting" the "m" value in createMatrix
      curx = fp24p8toi( mulfp8p24(m11,fx) + mulfp8p24(m21,fy) + dx);
      cury = fp24p8toi( mulfp8p24(m22,fy) + mulfp8p24(m12,fx) + dy);

      if ( (i==0) | ( ((curx - lastx) | (cury - lasty)) != 0) )
        {
          p.append(QPoint(curx, cury));
          lastx = curx;
          lasty = cury;
        }
    }

  return p;
}

void ECentralHexagon::initElement()
{
    /// init polygon ///
    this->clearAllPolygon();
    QPolygon polygon;

    polygon.putPoints(0, 6,  30,-50,  59,0,  30,50,  -30,50, -59,0, -30,-50);
    this->addPolygon(polygon);

    /// ///
    this->isAnimeFinished = false;
    if(GameInfo::gameStatus == GameOver)
    {
        this->isGameOver = true;
        this->zoomPolygon(4);
    }
    else
    {
        this->isGameOver = false;
    }

    this->pen.setWidth(6);
    this->pen.setJoinStyle(Qt::MiterJoin);
    this->brush.setStyle(Qt::SolidPattern);
}

void mySpeedWatch::drawIndicator(QPainter *painter)
{
    painter->save();
    QPolygon pts;
    pts.setPoints(3, -2,0, 2,0, 0,60);	/* (-2,0)/(2,0)/(0,60) */

    painter->rotate(m_startAngle);
    double degRotate =  (360.0 - m_startAngle - m_endAngle)/(m_maxValue - m_minValue)*(m_value - m_minValue);

    //画指针
    painter->rotate(degRotate);
    QRadialGradient haloGradient(0, 0, 60, 0, 0);
    haloGradient.setColorAt(0, QColor(60,60,60));
    haloGradient.setColorAt(1, QColor(160,160,160));
    painter->setPen(Qt::white);
    painter->setBrush(haloGradient);
    painter->drawConvexPolygon(pts);
    painter->restore();

    //画中心点
    QColor niceBlue(150, 150, 200);
    QConicalGradient coneGradient(0, 0, -90.0);
    coneGradient.setColorAt(0.0, Qt::darkGray);
    coneGradient.setColorAt(0.2, niceBlue);
    coneGradient.setColorAt(0.5, Qt::white);
    coneGradient.setColorAt(1.0, Qt::darkGray);
    painter->setPen(Qt::NoPen);
    painter->setBrush(coneGradient);
    painter->drawEllipse(-5, -5, 10, 10);
}

	void LineString::draw(QPainter* painter, const MapAdapter* mapadapter, const QRect &screensize, const QPoint offset)
	{
		if (!visible)
			return;
	
		QPolygon p = QPolygon();
	
		QPointF c;
		for (int i=0; i<vertices.size(); i++)
		{
			c = vertices[i]->coordinate();
			p.append(mapadapter->coordinateToDisplay(c));
		}
		if (mypen != 0)
		{
			painter->save();
			painter->setPen(*mypen);
		}
		painter->drawPolyline(p);
		if (mypen != 0)
		{
			painter->restore();
		}
		for (int i=0; i<vertices.size(); i++)
		{
			vertices[i]->draw(painter, mapadapter, screensize, offset);
		}
	}

//将位置转换成字符串
QwtText RectPicker::trackerTextF(const QPointF &pos) const
{
	QwtText text;

	const QPolygon points = selection();//选择的点
	if (!points.isEmpty())
	{
		QString num;
		QPoint point = points[0];
		QPointF point2 = invTransform(point);
		num = QString("(%1,%2),(,)").arg(point2.x()).arg(point2.y());
		QColor bg(Qt::white);
		bg.setAlpha(200);
		if (points.size() == 2)
		{

			QPointF point0 = invTransform(points[0]);
			QPointF point1 = invTransform(points[1]);
			num = QString("(%1,%2),(%3,%4)").arg(point0.x()).arg(point0.y()).arg(point1.x()).arg(point1.y());
		}
		text.setBackgroundBrush(QBrush(bg));
		text.setText(num);
	}
	return text;
}